source3/smbd/posix_acls.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB NT Security Descriptor / Unix permission conversion.
   4    Copyright (C) Jeremy Allison 1994-2009.
   5    Copyright (C) Andreas Gruenbacher 2002.
   6    Copyright (C) Simo Sorce <idra@samba.org> 2009.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "smbd/smbd.h"
  24 #include "system/filesys.h"
  25 #include "../libcli/security/security.h"
  26 #include "trans2.h"
  27 #include "passdb/lookup_sid.h"
  28 #include "auth.h"
  29 #include "../librpc/gen_ndr/idmap.h"
  30 #include "../librpc/gen_ndr/ndr_smb_acl.h"
  31 #include "lib/param/loadparm.h"
  32
  33 extern const struct generic_mapping file_generic_mapping;
  34
  35 #undef  DBGC_CLASS
  36 #define DBGC_CLASS DBGC_ACLS
  37
  38 /****************************************************************************
  39  Data structures representing the internal ACE format.
  40 ****************************************************************************/
  41
  42 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  43 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  44
  45 typedef struct canon_ace {
  46         struct canon_ace *next, *prev;
  47         SMB_ACL_TAG_T type;
  48         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  49         struct dom_sid trustee;
  50         enum ace_owner owner_type;
  51         enum ace_attribute attr;
  52         struct unixid unix_ug;
  53         uint8_t ace_flags; /* From windows ACE entry. */
  54 } canon_ace;
  55
  56 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  57
  58 /*
  59  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  60  * attribute on disk - version 1.
  61  * All values are little endian.
  62  *
  63  * |  1   |  1   |   2         |         2           |  ....
  64  * +------+------+-------------+---------------------+-------------+--------------------+
  65  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  66  * +------+------+-------------+---------------------+-------------+--------------------+
  67  *
  68  * Entry format is :
  69  *
  70  * |  1   |       4           |
  71  * +------+-------------------+
  72  * | value|  uid/gid or world |
  73  * | type |  value            |
  74  * +------+-------------------+
  75  *
  76  * Version 2 format. Stores extra Windows metadata about an ACL.
  77  *
  78  * |  1   |  2       |   2         |         2           |  ....
  79  * +------+----------+-------------+---------------------+-------------+--------------------+
  80  * | vers | ace      | num_entries | num_default_entries | ..entries.. | default_entries... |
  81  * |   2  |  type    |             |                     |             |                    |
  82  * +------+----------+-------------+---------------------+-------------+--------------------+
  83  *
  84  * Entry format is :
  85  *
  86  * |  1   |  1   |       4           |
  87  * +------+------+-------------------+
  88  * | ace  | value|  uid/gid or world |
  89  * | flag | type |  value            |
  90  * +------+-------------------+------+
  91  *
  92  */
  93
  94 #define PAI_VERSION_OFFSET                      0
  95
  96 #define PAI_V1_FLAG_OFFSET                      1
  97 #define PAI_V1_NUM_ENTRIES_OFFSET               2
  98 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET       4
  99 #define PAI_V1_ENTRIES_BASE                     6
 100 #define PAI_V1_ACL_FLAG_PROTECTED               0x1
 101 #define PAI_V1_ENTRY_LENGTH                     5
 102
 103 #define PAI_V1_VERSION                          1
 104
 105 #define PAI_V2_TYPE_OFFSET                      1
 106 #define PAI_V2_NUM_ENTRIES_OFFSET               3
 107 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET       5
 108 #define PAI_V2_ENTRIES_BASE                     7
 109 #define PAI_V2_ENTRY_LENGTH                     6
 110
 111 #define PAI_V2_VERSION                          2
 112
 113 /*
 114  * In memory format of user.SAMBA_PAI attribute.
 115  */
 116
 117 struct pai_entry {
 118         struct pai_entry *next, *prev;
 119         uint8_t ace_flags;
 120         enum ace_owner owner_type;
 121         struct unixid unix_ug;
 122 };
 123
 124 struct pai_val {
 125         uint16_t sd_type;
 126         unsigned int num_entries;
 127         struct pai_entry *entry_list;
 128         unsigned int num_def_entries;
 129         struct pai_entry *def_entry_list;
 130 };
 131
 132 /************************************************************************
 133  Return a uint32 of the pai_entry principal.
 134 ************************************************************************/
 135
 136 static uint32_t get_pai_entry_val(struct pai_entry *paie)
 137 {
 138         switch (paie->owner_type) {
 139                 case UID_ACE:
 140                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.id ));
 141                         return (uint32_t)paie->unix_ug.id;
 142                 case GID_ACE:
 143                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.id ));
 144                         return (uint32_t)paie->unix_ug.id;
 145                 case WORLD_ACE:
 146                 default:
 147                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 148                         return (uint32_t)-1;
 149         }
 150 }
 151
 152 /************************************************************************
 153  Return a uint32 of the entry principal.
 154 ************************************************************************/
 155
 156 static uint32_t get_entry_val(canon_ace *ace_entry)
 157 {
 158         switch (ace_entry->owner_type) {
 159                 case UID_ACE:
 160                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.id ));
 161                         return (uint32_t)ace_entry->unix_ug.id;
 162                 case GID_ACE:
 163                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.id ));
 164                         return (uint32_t)ace_entry->unix_ug.id;
 165                 case WORLD_ACE:
 166                 default:
 167                         DEBUG(10,("get_entry_val: world ace\n"));
 168                         return (uint32_t)-1;
 169         }
 170 }
 171
 172 /************************************************************************
 173  Create the on-disk format (always v2 now). Caller must free.
 174 ************************************************************************/
 175
 176 static char *create_pai_buf_v2(canon_ace *file_ace_list,
 177                                 canon_ace *dir_ace_list,
 178                                 uint16_t sd_type,
 179                                 size_t *store_size)
 180 {
 181         char *pai_buf = NULL;
 182         canon_ace *ace_list = NULL;
 183         char *entry_offset = NULL;
 184         unsigned int num_entries = 0;
 185         unsigned int num_def_entries = 0;
 186         unsigned int i;
 187
 188         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 189                 num_entries++;
 190         }
 191
 192         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 193                 num_def_entries++;
 194         }
 195
 196         DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 197
 198         *store_size = PAI_V2_ENTRIES_BASE +
 199                 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
 200
 201         pai_buf = talloc_array(talloc_tos(), char, *store_size);
 202         if (!pai_buf) {
 203                 return NULL;
 204         }
 205
 206         /* Set up the header. */
 207         memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
 208         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
 209         SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
 210         SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
 211         SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 212
 213         DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
 214                         (unsigned int)sd_type ));
 215
 216         entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
 217
 218         i = 0;
 219         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 220                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 221                 uint32_t entry_val = get_entry_val(ace_list);
 222
 223                 SCVAL(entry_offset,0,ace_list->ace_flags);
 224                 SCVAL(entry_offset,1,type_val);
 225                 SIVAL(entry_offset,2,entry_val);
 226                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 227                         i,
 228                         (unsigned int)ace_list->ace_flags,
 229                         (unsigned int)type_val,
 230                         (unsigned int)entry_val ));
 231                 i++;
 232                 entry_offset += PAI_V2_ENTRY_LENGTH;
 233         }
 234
 235         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 236                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 237                 uint32_t entry_val = get_entry_val(ace_list);
 238
 239                 SCVAL(entry_offset,0,ace_list->ace_flags);
 240                 SCVAL(entry_offset,1,type_val);
 241                 SIVAL(entry_offset,2,entry_val);
 242                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 243                         i,
 244                         (unsigned int)ace_list->ace_flags,
 245                         (unsigned int)type_val,
 246                         (unsigned int)entry_val ));
 247                 i++;
 248                 entry_offset += PAI_V2_ENTRY_LENGTH;
 249         }
 250
 251         return pai_buf;
 252 }
 253
 254 /************************************************************************
 255  Store the user.SAMBA_PAI attribute on disk.
 256 ************************************************************************/
 257
 258 static void store_inheritance_attributes(files_struct *fsp,
 259                                         canon_ace *file_ace_list,
 260                                         canon_ace *dir_ace_list,
 261                                         uint16_t sd_type)
 262 {
 263         int ret;
 264         size_t store_size;
 265         char *pai_buf;
 266
 267         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 268                 return;
 269         }
 270
 271         pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
 272                                 sd_type, &store_size);
 273
 274         if (fsp->fh->fd != -1) {
 275                 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 276                                 pai_buf, store_size, 0);
 277         } else {
 278                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
 279                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 280                                        pai_buf, store_size, 0);
 281         }
 282
 283         TALLOC_FREE(pai_buf);
 284
 285         DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
 286                 (unsigned int)sd_type,
 287                 fsp_str_dbg(fsp)));
 288
 289         if (ret == -1 && !no_acl_syscall_error(errno)) {
 290                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 291         }
 292 }
 293
 294 /************************************************************************
 295  Delete the in memory inheritance info.
 296 ************************************************************************/
 297
 298 static void free_inherited_info(struct pai_val *pal)
 299 {
 300         if (pal) {
 301                 struct pai_entry *paie, *paie_next;
 302                 for (paie = pal->entry_list; paie; paie = paie_next) {
 303                         paie_next = paie->next;
 304                         TALLOC_FREE(paie);
 305                 }
 306                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 307                         paie_next = paie->next;
 308                         TALLOC_FREE(paie);
 309                 }
 310                 TALLOC_FREE(pal);
 311         }
 312 }
 313
 314 /************************************************************************
 315  Get any stored ACE flags.
 316 ************************************************************************/
 317
 318 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
 319 {
 320         struct pai_entry *paie;
 321
 322         if (!pal) {
 323                 return 0;
 324         }
 325
 326         /* If the entry exists it is inherited. */
 327         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 328                 if (ace_entry->owner_type == paie->owner_type &&
 329                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 330                         return paie->ace_flags;
 331         }
 332         return 0;
 333 }
 334
 335 /************************************************************************
 336  Ensure an attribute just read is valid - v1.
 337 ************************************************************************/
 338
 339 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
 340 {
 341         uint16 num_entries;
 342         uint16 num_def_entries;
 343
 344         if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
 345                 /* Corrupted - too small. */
 346                 return false;
 347         }
 348
 349         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
 350                 return false;
 351         }
 352
 353         num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
 354         num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 355
 356         /* Check the entry lists match. */
 357         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 358
 359         if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
 360                         PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
 361                 return false;
 362         }
 363
 364         return true;
 365 }
 366
 367 /************************************************************************
 368  Ensure an attribute just read is valid - v2.
 369 ************************************************************************/
 370
 371 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
 372 {
 373         uint16 num_entries;
 374         uint16 num_def_entries;
 375
 376         if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
 377                 /* Corrupted - too small. */
 378                 return false;
 379         }
 380
 381         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
 382                 return false;
 383         }
 384
 385         num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
 386         num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 387
 388         /* Check the entry lists match. */
 389         /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
 390
 391         if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
 392                         PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
 393                 return false;
 394         }
 395
 396         return true;
 397 }
 398
 399 /************************************************************************
 400  Decode the owner.
 401 ************************************************************************/
 402
 403 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
 404 {
 405         paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 406         switch( paie->owner_type) {
 407                 case UID_ACE:
 408                         paie->unix_ug.type = ID_TYPE_UID;
 409                         paie->unix_ug.id = (uid_t)IVAL(entry_offset,1);
 410                         DEBUG(10,("get_pai_owner_type: uid = %u\n",
 411                                 (unsigned int)paie->unix_ug.id ));
 412                         break;
 413                 case GID_ACE:
 414                         paie->unix_ug.type = ID_TYPE_GID;
 415                         paie->unix_ug.id = (gid_t)IVAL(entry_offset,1);
 416                         DEBUG(10,("get_pai_owner_type: gid = %u\n",
 417                                 (unsigned int)paie->unix_ug.id ));
 418                         break;
 419                 case WORLD_ACE:
 420                         paie->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
 421                         paie->unix_ug.id = -1;
 422                         DEBUG(10,("get_pai_owner_type: world ace\n"));
 423                         break;
 424                 default:
 425                         DEBUG(10,("get_pai_owner_type: unknown type %u\n",
 426                                 (unsigned int)paie->owner_type ));
 427                         return false;
 428         }
 429         return true;
 430 }
 431
 432 /************************************************************************
 433  Process v2 entries.
 434 ************************************************************************/
 435
 436 static const char *create_pai_v1_entries(struct pai_val *paiv,
 437                                 const char *entry_offset,
 438                                 bool def_entry)
 439 {
 440         int i;
 441
 442         for (i = 0; i < paiv->num_entries; i++) {
 443                 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
 444                 if (!paie) {
 445                         return NULL;
 446                 }
 447
 448                 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
 449                 if (!get_pai_owner_type(paie, entry_offset)) {
 450                         TALLOC_FREE(paie);
 451                         return NULL;
 452                 }
 453
 454                 if (!def_entry) {
 455                         DLIST_ADD(paiv->entry_list, paie);
 456                 } else {
 457                         DLIST_ADD(paiv->def_entry_list, paie);
 458                 }
 459                 entry_offset += PAI_V1_ENTRY_LENGTH;
 460         }
 461         return entry_offset;
 462 }
 463
 464 /************************************************************************
 465  Convert to in-memory format from version 1.
 466 ************************************************************************/
 467
 468 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
 469 {
 470         const char *entry_offset;
 471         struct pai_val *paiv = NULL;
 472
 473         if (!check_pai_ok_v1(buf, size)) {
 474                 return NULL;
 475         }
 476
 477         paiv = talloc(talloc_tos(), struct pai_val);
 478         if (!paiv) {
 479                 return NULL;
 480         }
 481
 482         memset(paiv, '\0', sizeof(struct pai_val));
 483
 484         paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
 485                         SEC_DESC_DACL_PROTECTED : 0;
 486
 487         paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
 488         paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 489
 490         entry_offset = buf + PAI_V1_ENTRIES_BASE;
 491
 492         DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
 493                         paiv->num_entries, paiv->num_def_entries ));
 494
 495         entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
 496         if (entry_offset == NULL) {
 497                 free_inherited_info(paiv);
 498                 return NULL;
 499         }
 500         entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
 501         if (entry_offset == NULL) {
 502                 free_inherited_info(paiv);
 503                 return NULL;
 504         }
 505
 506         return paiv;
 507 }
 508
 509 /************************************************************************
 510  Process v2 entries.
 511 ************************************************************************/
 512
 513 static const char *create_pai_v2_entries(struct pai_val *paiv,
 514                                 unsigned int num_entries,
 515                                 const char *entry_offset,
 516                                 bool def_entry)
 517 {
 518         unsigned int i;
 519
 520         for (i = 0; i < num_entries; i++) {
 521                 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
 522                 if (!paie) {
 523                         return NULL;
 524                 }
 525
 526                 paie->ace_flags = CVAL(entry_offset,0);
 527
 528                 if (!get_pai_owner_type(paie, entry_offset+1)) {
 529                         TALLOC_FREE(paie);
 530                         return NULL;
 531                 }
 532                 if (!def_entry) {
 533                         DLIST_ADD(paiv->entry_list, paie);
 534                 } else {
 535                         DLIST_ADD(paiv->def_entry_list, paie);
 536                 }
 537                 entry_offset += PAI_V2_ENTRY_LENGTH;
 538         }
 539         return entry_offset;
 540 }
 541
 542 /************************************************************************
 543  Convert to in-memory format from version 2.
 544 ************************************************************************/
 545
 546 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
 547 {
 548         const char *entry_offset;
 549         struct pai_val *paiv = NULL;
 550
 551         if (!check_pai_ok_v2(buf, size)) {
 552                 return NULL;
 553         }
 554
 555         paiv = talloc(talloc_tos(), struct pai_val);
 556         if (!paiv) {
 557                 return NULL;
 558         }
 559
 560         memset(paiv, '\0', sizeof(struct pai_val));
 561
 562         paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
 563
 564         paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
 565         paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 566
 567         entry_offset = buf + PAI_V2_ENTRIES_BASE;
 568
 569         DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
 570                         (unsigned int)paiv->sd_type,
 571                         paiv->num_entries, paiv->num_def_entries ));
 572
 573         entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
 574                                 entry_offset, false);
 575         if (entry_offset == NULL) {
 576                 free_inherited_info(paiv);
 577                 return NULL;
 578         }
 579         entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
 580                                 entry_offset, true);
 581         if (entry_offset == NULL) {
 582                 free_inherited_info(paiv);
 583                 return NULL;
 584         }
 585
 586         return paiv;
 587 }
 588
 589 /************************************************************************
 590  Convert to in-memory format - from either version 1 or 2.
 591 ************************************************************************/
 592
 593 static struct pai_val *create_pai_val(const char *buf, size_t size)
 594 {
 595         if (size < 1) {
 596                 return NULL;
 597         }
 598         if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
 599                 return create_pai_val_v1(buf, size);
 600         } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
 601                 return create_pai_val_v2(buf, size);
 602         } else {
 603                 return NULL;
 604         }
 605 }
 606
 607 /************************************************************************
 608  Load the user.SAMBA_PAI attribute.
 609 ************************************************************************/
 610
 611 static struct pai_val *fload_inherited_info(files_struct *fsp)
 612 {
 613         char *pai_buf;
 614         size_t pai_buf_size = 1024;
 615         struct pai_val *paiv = NULL;
 616         ssize_t ret;
 617
 618         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 619                 return NULL;
 620         }
 621
 622         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
 623                 return NULL;
 624         }
 625
 626         do {
 627                 if (fsp->fh->fd != -1) {
 628                         ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 629                                         pai_buf, pai_buf_size);
 630                 } else {
 631                         ret = SMB_VFS_GETXATTR(fsp->conn,
 632                                                fsp->fsp_name->base_name,
 633                                                SAMBA_POSIX_INHERITANCE_EA_NAME,
 634                                                pai_buf, pai_buf_size);
 635                 }
 636
 637                 if (ret == -1) {
 638                         if (errno != ERANGE) {
 639                                 break;
 640                         }
 641                         /* Buffer too small - enlarge it. */
 642                         pai_buf_size *= 2;
 643                         TALLOC_FREE(pai_buf);
 644                         if (pai_buf_size > 1024*1024) {
 645                                 return NULL; /* Limit malloc to 1mb. */
 646                         }
 647                         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
 648                                 return NULL;
 649                 }
 650         } while (ret == -1);
 651
 652         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
 653                   (unsigned long)ret, fsp_str_dbg(fsp)));
 654
 655         if (ret == -1) {
 656                 /* No attribute or not supported. */
 657 #if defined(ENOATTR)
 658                 if (errno != ENOATTR)
 659                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 660 #else
 661                 if (errno != ENOSYS)
 662                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 663 #endif
 664                 TALLOC_FREE(pai_buf);
 665                 return NULL;
 666         }
 667
 668         paiv = create_pai_val(pai_buf, ret);
 669
 670         if (paiv) {
 671                 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
 672                           (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
 673         }
 674
 675         TALLOC_FREE(pai_buf);
 676         return paiv;
 677 }
 678
 679 /************************************************************************
 680  Load the user.SAMBA_PAI attribute.
 681 ************************************************************************/
 682
 683 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
 684                                            const char *fname)
 685 {
 686         char *pai_buf;
 687         size_t pai_buf_size = 1024;
 688         struct pai_val *paiv = NULL;
 689         ssize_t ret;
 690
 691         if (!lp_map_acl_inherit(SNUM(conn))) {
 692                 return NULL;
 693         }
 694
 695         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
 696                 return NULL;
 697         }
 698
 699         do {
 700                 ret = SMB_VFS_GETXATTR(conn, fname,
 701                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 702                                        pai_buf, pai_buf_size);
 703
 704                 if (ret == -1) {
 705                         if (errno != ERANGE) {
 706                                 break;
 707                         }
 708                         /* Buffer too small - enlarge it. */
 709                         pai_buf_size *= 2;
 710                         TALLOC_FREE(pai_buf);
 711                         if (pai_buf_size > 1024*1024) {
 712                                 return NULL; /* Limit malloc to 1mb. */
 713                         }
 714                         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
 715                                 return NULL;
 716                 }
 717         } while (ret == -1);
 718
 719         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
 720
 721         if (ret == -1) {
 722                 /* No attribute or not supported. */
 723 #if defined(ENOATTR)
 724                 if (errno != ENOATTR)
 725                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 726 #else
 727                 if (errno != ENOSYS)
 728                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 729 #endif
 730                 TALLOC_FREE(pai_buf);
 731                 return NULL;
 732         }
 733
 734         paiv = create_pai_val(pai_buf, ret);
 735
 736         if (paiv) {
 737                 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
 738                         (unsigned int)paiv->sd_type,
 739                         fname));
 740         }
 741
 742         TALLOC_FREE(pai_buf);
 743         return paiv;
 744 }
 745
 746 /****************************************************************************
 747  Functions to manipulate the internal ACE format.
 748 ****************************************************************************/
 749
 750 /****************************************************************************
 751  Count a linked list of canonical ACE entries.
 752 ****************************************************************************/
 753
 754 static size_t count_canon_ace_list( canon_ace *l_head )
 755 {
 756         size_t count = 0;
 757         canon_ace *ace;
 758
 759         for (ace = l_head; ace; ace = ace->next)
 760                 count++;
 761
 762         return count;
 763 }
 764
 765 /****************************************************************************
 766  Free a linked list of canonical ACE entries.
 767 ****************************************************************************/
 768
 769 static void free_canon_ace_list( canon_ace *l_head )
 770 {
 771         canon_ace *list, *next;
 772
 773         for (list = l_head; list; list = next) {
 774                 next = list->next;
 775                 DLIST_REMOVE(l_head, list);
 776                 TALLOC_FREE(list);
 777         }
 778 }
 779
 780 /****************************************************************************
 781  Function to duplicate a canon_ace entry.
 782 ****************************************************************************/
 783
 784 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 785 {
 786         canon_ace *dst_ace = talloc(talloc_tos(), canon_ace);
 787
 788         if (dst_ace == NULL)
 789                 return NULL;
 790
 791         *dst_ace = *src_ace;
 792         dst_ace->prev = dst_ace->next = NULL;
 793         return dst_ace;
 794 }
 795
 796 /****************************************************************************
 797  Print out a canon ace.
 798 ****************************************************************************/
 799
 800 static void print_canon_ace(canon_ace *pace, int num)
 801 {
 802         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 803         dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
 804         if (pace->owner_type == UID_ACE) {
 805                 const char *u_name = uidtoname(pace->unix_ug.id);
 806                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.id, u_name );
 807         } else if (pace->owner_type == GID_ACE) {
 808                 char *g_name = gidtoname(pace->unix_ug.id);
 809                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.id, g_name );
 810         } else
 811                 dbgtext( "other ");
 812         switch (pace->type) {
 813                 case SMB_ACL_USER:
 814                         dbgtext( "SMB_ACL_USER ");
 815                         break;
 816                 case SMB_ACL_USER_OBJ:
 817                         dbgtext( "SMB_ACL_USER_OBJ ");
 818                         break;
 819                 case SMB_ACL_GROUP:
 820                         dbgtext( "SMB_ACL_GROUP ");
 821                         break;
 822                 case SMB_ACL_GROUP_OBJ:
 823                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 824                         break;
 825                 case SMB_ACL_OTHER:
 826                         dbgtext( "SMB_ACL_OTHER ");
 827                         break;
 828                 default:
 829                         dbgtext( "MASK " );
 830                         break;
 831         }
 832
 833         dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
 834         dbgtext( "perms ");
 835         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 836         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 837         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 838 }
 839
 840 /****************************************************************************
 841  Print out a canon ace list.
 842 ****************************************************************************/
 843
 844 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 845 {
 846         int count = 0;
 847
 848         if( DEBUGLVL( 10 )) {
 849                 dbgtext( "print_canon_ace_list: %s\n", name );
 850                 for (;ace_list; ace_list = ace_list->next, count++)
 851                         print_canon_ace(ace_list, count );
 852         }
 853 }
 854
 855 /****************************************************************************
 856  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 857 ****************************************************************************/
 858
 859 static mode_t convert_permset_to_mode_t(SMB_ACL_PERMSET_T permset)
 860 {
 861         mode_t ret = 0;
 862
 863         ret |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRUSR : 0);
 864         ret |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 865         ret |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 866
 867         return ret;
 868 }
 869
 870 /****************************************************************************
 871  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 872 ****************************************************************************/
 873
 874 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 875 {
 876         mode_t ret = 0;
 877
 878         if (mode & r_mask)
 879                 ret |= S_IRUSR;
 880         if (mode & w_mask)
 881                 ret |= S_IWUSR;
 882         if (mode & x_mask)
 883                 ret |= S_IXUSR;
 884
 885         return ret;
 886 }
 887
 888 /****************************************************************************
 889  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 890  an SMB_ACL_PERMSET_T.
 891 ****************************************************************************/
 892
 893 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 894 {
 895         if (sys_acl_clear_perms(*p_permset) ==  -1)
 896                 return -1;
 897         if (mode & S_IRUSR) {
 898                 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1)
 899                         return -1;
 900         }
 901         if (mode & S_IWUSR) {
 902                 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1)
 903                         return -1;
 904         }
 905         if (mode & S_IXUSR) {
 906                 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1)
 907                         return -1;
 908         }
 909         return 0;
 910 }
 911
 912 /****************************************************************************
 913  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 914 ****************************************************************************/
 915
 916 void create_file_sids(const SMB_STRUCT_STAT *psbuf, struct dom_sid *powner_sid, struct dom_sid *pgroup_sid)
 917 {
 918         uid_to_sid( powner_sid, psbuf->st_ex_uid );
 919         gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
 920 }
 921
 922 /****************************************************************************
 923  Merge aces with a common UID or GID - if both are allow or deny, OR the permissions together and
 924  delete the second one. If the first is deny, mask the permissions off and delete the allow
 925  if the permissions become zero, delete the deny if the permissions are non zero.
 926 ****************************************************************************/
 927
 928 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
 929 {
 930         canon_ace *l_head = *pp_list_head;
 931         canon_ace *curr_ace_outer;
 932         canon_ace *curr_ace_outer_next;
 933
 934         /*
 935          * First, merge allow entries with identical SIDs, and deny entries
 936          * with identical SIDs.
 937          */
 938
 939         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 940                 canon_ace *curr_ace;
 941                 canon_ace *curr_ace_next;
 942
 943                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 944
 945                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 946                         bool can_merge = false;
 947
 948                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 949
 950                         /* For file ACLs we can merge if the SIDs and ALLOW/DENY
 951                          * types are the same. For directory acls we must also
 952                          * ensure the POSIX ACL types are the same.
 953                          *
 954                          * For the IDMAP_BOTH case, we must not merge
 955                          * the UID and GID ACE values for same SID
 956                          */
 957
 958                         if (!dir_acl) {
 959                                 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
 960                                              curr_ace->owner_type == curr_ace_outer->owner_type &&
 961                                              (curr_ace->attr == curr_ace_outer->attr));
 962                         } else {
 963                                 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
 964                                              curr_ace->owner_type == curr_ace_outer->owner_type &&
 965                                              (curr_ace->type == curr_ace_outer->type) &&
 966                                              (curr_ace->attr == curr_ace_outer->attr));
 967                         }
 968
 969                         if (can_merge) {
 970                                 if( DEBUGLVL( 10 )) {
 971                                         dbgtext("merge_aces: Merging ACE's\n");
 972                                         print_canon_ace( curr_ace_outer, 0);
 973                                         print_canon_ace( curr_ace, 0);
 974                                 }
 975
 976                                 /* Merge two allow or two deny ACE's. */
 977
 978                                 /* Theoretically we shouldn't merge a dir ACE if
 979                                  * one ACE has the CI flag set, and the other
 980                                  * ACE has the OI flag set, but this is rare
 981                                  * enough we can ignore it. */
 982
 983                                 curr_ace_outer->perms |= curr_ace->perms;
 984                                 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
 985                                 DLIST_REMOVE(l_head, curr_ace);
 986                                 TALLOC_FREE(curr_ace);
 987                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 988                         }
 989                 }
 990         }
 991
 992         /*
 993          * Now go through and mask off allow permissions with deny permissions.
 994          * We can delete either the allow or deny here as we know that each SID
 995          * appears only once in the list.
 996          */
 997
 998         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 999                 canon_ace *curr_ace;
1000                 canon_ace *curr_ace_next;
1001
1002                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
1003
1004                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
1005
1006                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1007
1008                         /*
1009                          * Subtract ACE's with different entries. Due to the ordering constraints
1010                          * we've put on the ACL, we know the deny must be the first one.
1011                          */
1012
1013                         if (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
1014                             (curr_ace->owner_type == curr_ace_outer->owner_type) &&
1015                             (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1016
1017                                 if( DEBUGLVL( 10 )) {
1018                                         dbgtext("merge_aces: Masking ACE's\n");
1019                                         print_canon_ace( curr_ace_outer, 0);
1020                                         print_canon_ace( curr_ace, 0);
1021                                 }
1022
1023                                 curr_ace->perms &= ~curr_ace_outer->perms;
1024
1025                                 if (curr_ace->perms == 0) {
1026
1027                                         /*
1028                                          * The deny overrides the allow. Remove the allow.
1029                                          */
1030
1031                                         DLIST_REMOVE(l_head, curr_ace);
1032                                         TALLOC_FREE(curr_ace);
1033                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1034
1035                                 } else {
1036
1037                                         /*
1038                                          * Even after removing permissions, there
1039                                          * are still allow permissions - delete the deny.
1040                                          * It is safe to delete the deny here,
1041                                          * as we are guarenteed by the deny first
1042                                          * ordering that all the deny entries for
1043                                          * this SID have already been merged into one
1044                                          * before we can get to an allow ace.
1045                                          */
1046
1047                                         DLIST_REMOVE(l_head, curr_ace_outer);
1048                                         TALLOC_FREE(curr_ace_outer);
1049                                         break;
1050                                 }
1051                         }
1052
1053                 } /* end for curr_ace */
1054         } /* end for curr_ace_outer */
1055
1056         /* We may have modified the list. */
1057
1058         *pp_list_head = l_head;
1059 }
1060
1061 /****************************************************************************
1062  Check if we need to return NT4.x compatible ACL entries.
1063 ****************************************************************************/
1064
1065 bool nt4_compatible_acls(void)
1066 {
1067         int compat = lp_acl_compatibility();
1068
1069         if (compat == ACL_COMPAT_AUTO) {
1070                 enum remote_arch_types ra_type = get_remote_arch();
1071
1072                 /* Automatically adapt to client */
1073                 return (ra_type <= RA_WINNT);
1074         } else
1075                 return (compat == ACL_COMPAT_WINNT);
1076 }
1077
1078
1079 /****************************************************************************
1080  Map canon_ace perms to permission bits NT.
1081  The attr element is not used here - we only process deny entries on set,
1082  not get. Deny entries are implicit on get with ace->perms = 0.
1083 ****************************************************************************/
1084
1085 uint32_t map_canon_ace_perms(int snum,
1086                                 enum security_ace_type *pacl_type,
1087                                 mode_t perms,
1088                                 bool directory_ace)
1089 {
1090         uint32_t nt_mask = 0;
1091
1092         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1093
1094         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1095                 if (directory_ace) {
1096                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1097                 } else {
1098                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1099                 }
1100         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1101                 /*
1102                  * Windows NT refuses to display ACEs with no permissions in them (but
1103                  * they are perfectly legal with Windows 2000). If the ACE has empty
1104                  * permissions we cannot use 0, so we use the otherwise unused
1105                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1106                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1107                  * to be changed in the future.
1108                  */
1109
1110                 if (nt4_compatible_acls())
1111                         nt_mask = UNIX_ACCESS_NONE;
1112                 else
1113                         nt_mask = 0;
1114         } else {
1115                 if (directory_ace) {
1116                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1117                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1118                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1119                 } else {
1120                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1121                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1122                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1123                 }
1124         }
1125
1126         if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1127                 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1128         }
1129
1130         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1131                         (unsigned int)perms, (unsigned int)nt_mask ));
1132
1133         return nt_mask;
1134 }
1135
1136 /****************************************************************************
1137  Map NT perms to a UNIX mode_t.
1138 ****************************************************************************/
1139
1140 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1141 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1142 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1143
1144 static mode_t map_nt_perms( uint32 *mask, int type)
1145 {
1146         mode_t mode = 0;
1147
1148         switch(type) {
1149         case S_IRUSR:
1150                 if((*mask) & GENERIC_ALL_ACCESS)
1151                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1152                 else {
1153                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1154                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1155                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1156                 }
1157                 break;
1158         case S_IRGRP:
1159                 if((*mask) & GENERIC_ALL_ACCESS)
1160                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1161                 else {
1162                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1163                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1164                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1165                 }
1166                 break;
1167         case S_IROTH:
1168                 if((*mask) & GENERIC_ALL_ACCESS)
1169                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1170                 else {
1171                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1172                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1173                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1174                 }
1175                 break;
1176         }
1177
1178         return mode;
1179 }
1180
1181 /****************************************************************************
1182  Unpack a struct security_descriptor into a UNIX owner and group.
1183 ****************************************************************************/
1184
1185 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1186                         uid_t *puser, gid_t *pgrp,
1187                         uint32 security_info_sent, const struct
1188                         security_descriptor *psd)
1189 {
1190         struct dom_sid owner_sid;
1191         struct dom_sid grp_sid;
1192
1193         *puser = (uid_t)-1;
1194         *pgrp = (gid_t)-1;
1195
1196         if(security_info_sent == 0) {
1197                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1198                 return NT_STATUS_OK;
1199         }
1200
1201         /*
1202          * Validate the owner and group SID's.
1203          */
1204
1205         memset(&owner_sid, '\0', sizeof(owner_sid));
1206         memset(&grp_sid, '\0', sizeof(grp_sid));
1207
1208         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1209
1210         /*
1211          * Don't immediately fail if the owner sid cannot be validated.
1212          * This may be a group chown only set.
1213          */
1214
1215         if (security_info_sent & SECINFO_OWNER) {
1216                 sid_copy(&owner_sid, psd->owner_sid);
1217                 if (!sid_to_uid(&owner_sid, puser)) {
1218                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1219                                 /* this allows take ownership to work
1220                                  * reasonably */
1221                                 *puser = get_current_uid(conn);
1222                         } else {
1223                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1224                                          " owner sid for %s\n",
1225                                          sid_string_dbg(&owner_sid)));
1226                                 return NT_STATUS_INVALID_OWNER;
1227                         }
1228                 }
1229                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1230                          (unsigned int)*puser ));
1231         }
1232
1233         /*
1234          * Don't immediately fail if the group sid cannot be validated.
1235          * This may be an owner chown only set.
1236          */
1237
1238         if (security_info_sent & SECINFO_GROUP) {
1239                 sid_copy(&grp_sid, psd->group_sid);
1240                 if (!sid_to_gid( &grp_sid, pgrp)) {
1241                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1242                                 /* this allows take group ownership to work
1243                                  * reasonably */
1244                                 *pgrp = get_current_gid(conn);
1245                         } else {
1246                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1247                                          " group sid.\n"));
1248                                 return NT_STATUS_INVALID_OWNER;
1249                         }
1250                 }
1251                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1252                          (unsigned int)*pgrp));
1253         }
1254
1255         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1256
1257         return NT_STATUS_OK;
1258 }
1259
1260 /****************************************************************************
1261  Ensure the enforced permissions for this share apply.
1262 ****************************************************************************/
1263
1264 static void apply_default_perms(const struct share_params *params,
1265                                 const bool is_directory, canon_ace *pace,
1266                                 mode_t type)
1267 {
1268         mode_t and_bits = (mode_t)0;
1269         mode_t or_bits = (mode_t)0;
1270
1271         /* Get the initial bits to apply. */
1272
1273         if (is_directory) {
1274                 and_bits = lp_dir_mask(params->service);
1275                 or_bits = lp_force_dir_mode(params->service);
1276         } else {
1277                 and_bits = lp_create_mask(params->service);
1278                 or_bits = lp_force_create_mode(params->service);
1279         }
1280
1281         /* Now bounce them into the S_USR space. */
1282         switch(type) {
1283         case S_IRUSR:
1284                 /* Ensure owner has read access. */
1285                 pace->perms |= S_IRUSR;
1286                 if (is_directory)
1287                         pace->perms |= (S_IWUSR|S_IXUSR);
1288                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1289                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1290                 break;
1291         case S_IRGRP:
1292                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1293                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1294                 break;
1295         case S_IROTH:
1296                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1297                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1298                 break;
1299         }
1300
1301         pace->perms = ((pace->perms & and_bits)|or_bits);
1302 }
1303
1304 /****************************************************************************
1305  Check if a given uid/SID is in a group gid/SID. This is probably very
1306  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1307 ****************************************************************************/
1308
1309 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1310 {
1311         /* "Everyone" always matches every uid. */
1312
1313         if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1314                 return True;
1315
1316         /*
1317          * if it's the current user, we already have the unix token
1318          * and don't need to do the complex user_in_group_sid() call
1319          */
1320         if (uid_ace->unix_ug.id == get_current_uid(conn)) {
1321                 const struct security_unix_token *curr_utok = NULL;
1322                 size_t i;
1323
1324                 if (group_ace->unix_ug.id == get_current_gid(conn)) {
1325                         return True;
1326                 }
1327
1328                 curr_utok = get_current_utok(conn);
1329                 for (i=0; i < curr_utok->ngroups; i++) {
1330                         if (group_ace->unix_ug.id == curr_utok->groups[i]) {
1331                                 return True;
1332                         }
1333                 }
1334         }
1335
1336         /*
1337          * user_in_group_sid() uses create_token_from_sid()
1338          * which creates an artificial NT token given just a username,
1339          * so this is not reliable for users from foreign domains
1340          * exported by winbindd!
1341          */
1342         return user_sid_in_group_sid(&uid_ace->trustee, &group_ace->trustee);
1343 }
1344
1345 /****************************************************************************
1346  A well formed POSIX file or default ACL has at least 3 entries, a
1347  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1348  In addition, the owner must always have at least read access.
1349  When using this call on get_acl, the pst struct is valid and contains
1350  the mode of the file.
1351 ****************************************************************************/
1352
1353 static bool ensure_canon_entry_valid_on_get(connection_struct *conn,
1354                                         canon_ace **pp_ace,
1355                                         const struct dom_sid *pfile_owner_sid,
1356                                         const struct dom_sid *pfile_grp_sid,
1357                                         const SMB_STRUCT_STAT *pst)
1358 {
1359         canon_ace *pace;
1360         bool got_user = false;
1361         bool got_group = false;
1362         bool got_other = false;
1363
1364         for (pace = *pp_ace; pace; pace = pace->next) {
1365                 if (pace->type == SMB_ACL_USER_OBJ) {
1366                         got_user = true;
1367                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1368                         got_group = true;
1369                 } else if (pace->type == SMB_ACL_OTHER) {
1370                         got_other = true;
1371                 }
1372         }
1373
1374         if (!got_user) {
1375                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1376                         DEBUG(0,("malloc fail.\n"));
1377                         return false;
1378                 }
1379
1380                 ZERO_STRUCTP(pace);
1381                 pace->type = SMB_ACL_USER_OBJ;
1382                 pace->owner_type = UID_ACE;
1383                 pace->unix_ug.type = ID_TYPE_UID;
1384                 pace->unix_ug.id = pst->st_ex_uid;
1385                 pace->trustee = *pfile_owner_sid;
1386                 pace->attr = ALLOW_ACE;
1387                 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1388                 DLIST_ADD(*pp_ace, pace);
1389         }
1390
1391         if (!got_group) {
1392                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1393                         DEBUG(0,("malloc fail.\n"));
1394                         return false;
1395                 }
1396
1397                 ZERO_STRUCTP(pace);
1398                 pace->type = SMB_ACL_GROUP_OBJ;
1399                 pace->owner_type = GID_ACE;
1400                 pace->unix_ug.type = ID_TYPE_GID;
1401                 pace->unix_ug.id = pst->st_ex_gid;
1402                 pace->trustee = *pfile_grp_sid;
1403                 pace->attr = ALLOW_ACE;
1404                 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1405                 DLIST_ADD(*pp_ace, pace);
1406         }
1407
1408         if (!got_other) {
1409                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1410                         DEBUG(0,("malloc fail.\n"));
1411                         return false;
1412                 }
1413
1414                 ZERO_STRUCTP(pace);
1415                 pace->type = SMB_ACL_OTHER;
1416                 pace->owner_type = WORLD_ACE;
1417                 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1418                 pace->unix_ug.id = -1;
1419                 pace->trustee = global_sid_World;
1420                 pace->attr = ALLOW_ACE;
1421                 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1422                 DLIST_ADD(*pp_ace, pace);
1423         }
1424
1425         return true;
1426 }
1427
1428 /****************************************************************************
1429  A well formed POSIX file or default ACL has at least 3 entries, a
1430  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1431  In addition, the owner must always have at least read access.
1432  When using this call on set_acl, the pst struct has
1433  been modified to have a mode containing the default for this file or directory
1434  type.
1435 ****************************************************************************/
1436
1437 static bool ensure_canon_entry_valid_on_set(connection_struct *conn,
1438                                         canon_ace **pp_ace,
1439                                         bool is_default_acl,
1440                                         const struct share_params *params,
1441                                         const bool is_directory,
1442                                         const struct dom_sid *pfile_owner_sid,
1443                                         const struct dom_sid *pfile_grp_sid,
1444                                         const SMB_STRUCT_STAT *pst)
1445 {
1446         canon_ace *pace;
1447         canon_ace *pace_user = NULL;
1448         canon_ace *pace_group = NULL;
1449         canon_ace *pace_other = NULL;
1450         bool got_duplicate_user = false;
1451         bool got_duplicate_group = false;
1452
1453         for (pace = *pp_ace; pace; pace = pace->next) {
1454                 if (pace->type == SMB_ACL_USER_OBJ) {
1455
1456                         if (!is_default_acl) {
1457                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1458                         }
1459                         pace_user = pace;
1460
1461                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1462
1463                         /*
1464                          * Ensure create mask/force create mode is respected on set.
1465                          */
1466
1467                         if (!is_default_acl) {
1468                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1469                         }
1470                         pace_group = pace;
1471
1472                 } else if (pace->type == SMB_ACL_OTHER) {
1473
1474                         /*
1475                          * Ensure create mask/force create mode is respected on set.
1476                          */
1477
1478                         if (!is_default_acl) {
1479                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1480                         }
1481                         pace_other = pace;
1482
1483                 } else if (pace->type == SMB_ACL_USER || pace->type == SMB_ACL_GROUP) {
1484
1485                         /*
1486                          * Ensure create mask/force create mode is respected on set.
1487                          */
1488
1489                         if (!is_default_acl) {
1490                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1491                         }
1492                 }
1493         }
1494
1495         if (!pace_user) {
1496                 canon_ace *pace_iter;
1497
1498                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1499                         DEBUG(0,("talloc fail.\n"));
1500                         return false;
1501                 }
1502
1503                 ZERO_STRUCTP(pace);
1504                 pace->type = SMB_ACL_USER_OBJ;
1505                 pace->owner_type = UID_ACE;
1506                 pace->unix_ug.type = ID_TYPE_UID;
1507                 pace->unix_ug.id = pst->st_ex_uid;
1508                 pace->trustee = *pfile_owner_sid;
1509                 pace->attr = ALLOW_ACE;
1510                 /* Start with existing user permissions, principle of least
1511                    surprises for the user. */
1512                 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1513
1514                 /* See if the owning user is in any of the other groups in
1515                    the ACE, or if there's a matching user entry (by uid
1516                    or in the case of ID_TYPE_BOTH by SID).
1517                    If so, OR in the permissions from that entry. */
1518
1519
1520                 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1521                         if (pace_iter->type == SMB_ACL_USER &&
1522                                         pace_iter->unix_ug.id == pace->unix_ug.id) {
1523                                 pace->perms |= pace_iter->perms;
1524                         } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1525                                 if (dom_sid_equal(&pace->trustee, &pace_iter->trustee)) {
1526                                         pace->perms |= pace_iter->perms;
1527                                 } else if (uid_entry_in_group(conn, pace, pace_iter)) {
1528                                         pace->perms |= pace_iter->perms;
1529                                 }
1530                         }
1531                 }
1532
1533                 if (pace->perms == 0) {
1534                         /* If we only got an "everyone" perm, just use that. */
1535                         if (pace_other)
1536                                 pace->perms = pace_other->perms;
1537                 }
1538
1539                 if (!is_default_acl) {
1540                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1541                 }
1542
1543                 DLIST_ADD(*pp_ace, pace);
1544                 pace_user = pace;
1545         }
1546
1547         if (!pace_group) {
1548                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1549                         DEBUG(0,("talloc fail.\n"));
1550                         return false;
1551                 }
1552
1553                 ZERO_STRUCTP(pace);
1554                 pace->type = SMB_ACL_GROUP_OBJ;
1555                 pace->owner_type = GID_ACE;
1556                 pace->unix_ug.type = ID_TYPE_GID;
1557                 pace->unix_ug.id = pst->st_ex_gid;
1558                 pace->trustee = *pfile_grp_sid;
1559                 pace->attr = ALLOW_ACE;
1560
1561                 /* If we only got an "everyone" perm, just use that. */
1562                 if (pace_other) {
1563                         pace->perms = pace_other->perms;
1564                 } else {
1565                         pace->perms = 0;
1566                 }
1567                 if (!is_default_acl) {
1568                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1569                 }
1570
1571                 DLIST_ADD(*pp_ace, pace);
1572                 pace_group = pace;
1573         }
1574
1575         if (!pace_other) {
1576                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1577                         DEBUG(0,("talloc fail.\n"));
1578                         return false;
1579                 }
1580
1581                 ZERO_STRUCTP(pace);
1582                 pace->type = SMB_ACL_OTHER;
1583                 pace->owner_type = WORLD_ACE;
1584                 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1585                 pace->unix_ug.id = -1;
1586                 pace->trustee = global_sid_World;
1587                 pace->attr = ALLOW_ACE;
1588                 pace->perms = 0;
1589                 if (!is_default_acl) {
1590                         apply_default_perms(params, is_directory, pace, S_IROTH);
1591                 }
1592
1593                 DLIST_ADD(*pp_ace, pace);
1594                 pace_other = pace;
1595         }
1596
1597         /* Ensure when setting a POSIX ACL, that the uid for a
1598            SMB_ACL_USER_OBJ ACE (the owner ACE entry) has a duplicate
1599            permission entry as an SMB_ACL_USER, and a gid for a
1600            SMB_ACL_GROUP_OBJ ACE (the primary group ACE entry) also has
1601            a duplicate permission entry as an SMB_ACL_GROUP. If not,
1602            then if the ownership or group ownership of this file or
1603            directory gets changed, the user or group can lose their
1604            access. */
1605
1606         for (pace = *pp_ace; pace; pace = pace->next) {
1607                 if (pace->type == SMB_ACL_USER &&
1608                                 pace->unix_ug.id == pace_user->unix_ug.id) {
1609                         /* Already got one. */
1610                         got_duplicate_user = true;
1611                 } else if (pace->type == SMB_ACL_GROUP &&
1612                                 pace->unix_ug.id == pace_group->unix_ug.id) {
1613                         /* Already got one. */
1614                         got_duplicate_group = true;
1615                 } else if ((pace->type == SMB_ACL_GROUP)
1616                            && (dom_sid_equal(&pace->trustee, &pace_user->trustee))) {
1617                         /* If the SID owning the file appears
1618                          * in a group entry, then we have
1619                          * enough duplication, they will still
1620                          * have access */
1621                         got_duplicate_user = true;
1622                 }
1623         }
1624
1625         /* If the SID is equal for the user and group that we need
1626            to add the duplicate for, add only the group */
1627         if (!got_duplicate_user && !got_duplicate_group
1628                         && dom_sid_equal(&pace_group->trustee,
1629                                         &pace_user->trustee)) {
1630                 /* Add a duplicate SMB_ACL_GROUP entry, this
1631                  * will cover the owning SID as well, as it
1632                  * will always be mapped to both a uid and
1633                  * gid. */
1634
1635                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1636                         DEBUG(0,("talloc fail.\n"));
1637                         return false;
1638                 }
1639
1640                 ZERO_STRUCTP(pace);
1641                 pace->type = SMB_ACL_GROUP;;
1642                 pace->owner_type = GID_ACE;
1643                 pace->unix_ug.type = ID_TYPE_GID;
1644                 pace->unix_ug.id = pace_group->unix_ug.id;
1645                 pace->trustee = pace_group->trustee;
1646                 pace->attr = pace_group->attr;
1647                 pace->perms = pace_group->perms;
1648
1649                 DLIST_ADD(*pp_ace, pace);
1650
1651                 /* We're done here, make sure the
1652                    statements below are not executed. */
1653                 got_duplicate_user = true;
1654                 got_duplicate_group = true;
1655         }
1656
1657         if (!got_duplicate_user) {
1658                 /* Add a duplicate SMB_ACL_USER entry. */
1659                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1660                         DEBUG(0,("talloc fail.\n"));
1661                         return false;
1662                 }
1663
1664                 ZERO_STRUCTP(pace);
1665                 pace->type = SMB_ACL_USER;;
1666                 pace->owner_type = UID_ACE;
1667                 pace->unix_ug.type = ID_TYPE_UID;
1668                 pace->unix_ug.id = pace_user->unix_ug.id;
1669                 pace->trustee = pace_user->trustee;
1670                 pace->attr = pace_user->attr;
1671                 pace->perms = pace_user->perms;
1672
1673                 DLIST_ADD(*pp_ace, pace);
1674
1675                 got_duplicate_user = true;
1676         }
1677
1678         if (!got_duplicate_group) {
1679                 /* Add a duplicate SMB_ACL_GROUP entry. */
1680                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1681                         DEBUG(0,("talloc fail.\n"));
1682                         return false;
1683                 }
1684
1685                 ZERO_STRUCTP(pace);
1686                 pace->type = SMB_ACL_GROUP;;
1687                 pace->owner_type = GID_ACE;
1688                 pace->unix_ug.type = ID_TYPE_GID;
1689                 pace->unix_ug.id = pace_group->unix_ug.id;
1690                 pace->trustee = pace_group->trustee;
1691                 pace->attr = pace_group->attr;
1692                 pace->perms = pace_group->perms;
1693
1694                 DLIST_ADD(*pp_ace, pace);
1695
1696                 got_duplicate_group = true;
1697         }
1698
1699         return true;
1700 }
1701
1702 /****************************************************************************
1703  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1704  If it does not have them, check if there are any entries where the trustee is the
1705  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1706  Note we must not do this to default directory ACLs.
1707 ****************************************************************************/
1708
1709 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1710 {
1711         bool got_user_obj, got_group_obj;
1712         canon_ace *current_ace;
1713         int i, entries;
1714
1715         entries = count_canon_ace_list(ace);
1716         got_user_obj = False;
1717         got_group_obj = False;
1718
1719         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1720                 if (current_ace->type == SMB_ACL_USER_OBJ)
1721                         got_user_obj = True;
1722                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1723                         got_group_obj = True;
1724         }
1725         if (got_user_obj && got_group_obj) {
1726                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1727                 return;
1728         }
1729
1730         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1731                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1732                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1733                         current_ace->type = SMB_ACL_USER_OBJ;
1734                         got_user_obj = True;
1735                 }
1736                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1737                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1738                         current_ace->type = SMB_ACL_GROUP_OBJ;
1739                         got_group_obj = True;
1740                 }
1741         }
1742         if (!got_user_obj)
1743                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1744         if (!got_group_obj)
1745                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1746 }
1747
1748 static bool add_current_ace_to_acl(files_struct *fsp, struct security_ace *psa,
1749                                    canon_ace **file_ace, canon_ace **dir_ace,
1750                                    bool *got_file_allow, bool *got_dir_allow,
1751                                    bool *all_aces_are_inherit_only,
1752                                    canon_ace *current_ace)
1753 {
1754
1755         /*
1756          * Map the given NT permissions into a UNIX mode_t containing only
1757          * S_I(R|W|X)USR bits.
1758          */
1759
1760         current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1761         current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1762
1763         /* Store the ace_flag. */
1764         current_ace->ace_flags = psa->flags;
1765
1766         /*
1767          * Now add the created ace to either the file list, the directory
1768          * list, or both. We *MUST* preserve the order here (hence we use
1769          * DLIST_ADD_END) as NT ACLs are order dependent.
1770          */
1771
1772         if (fsp->is_directory) {
1773
1774                 /*
1775                  * We can only add to the default POSIX ACE list if the ACE is
1776                  * designed to be inherited by both files and directories.
1777                  */
1778
1779                 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1780                     (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1781
1782                         canon_ace *current_dir_ace = current_ace;
1783                         DLIST_ADD_END(*dir_ace, current_ace, canon_ace *);
1784
1785                         /*
1786                          * Note if this was an allow ace. We can't process
1787                          * any further deny ace's after this.
1788                          */
1789
1790                         if (current_ace->attr == ALLOW_ACE)
1791                                 *got_dir_allow = True;
1792
1793                         if ((current_ace->attr == DENY_ACE) && *got_dir_allow) {
1794                                 DEBUG(0,("add_current_ace_to_acl: "
1795                                          "malformed ACL in "
1796                                          "inheritable ACL! Deny entry "
1797                                          "after Allow entry. Failing "
1798                                          "to set on file %s.\n",
1799                                          fsp_str_dbg(fsp)));
1800                                 return False;
1801                         }
1802
1803                         if( DEBUGLVL( 10 )) {
1804                                 dbgtext("add_current_ace_to_acl: adding dir ACL:\n");
1805                                 print_canon_ace( current_ace, 0);
1806                         }
1807
1808                         /*
1809                          * If this is not an inherit only ACE we need to add a duplicate
1810                          * to the file acl.
1811                          */
1812
1813                         if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1814                                 canon_ace *dup_ace = dup_canon_ace(current_ace);
1815
1816                                 if (!dup_ace) {
1817                                         DEBUG(0,("add_current_ace_to_acl: malloc fail !\n"));
1818                                         return False;
1819                                 }
1820
1821                                 /*
1822                                  * We must not free current_ace here as its
1823                                  * pointer is now owned by the dir_ace list.
1824                                  */
1825                                 current_ace = dup_ace;
1826                                 /* We've essentially split this ace into two,
1827                                  * and added the ace with inheritance request
1828                                  * bits to the directory ACL. Drop those bits for
1829                                  * the ACE we're adding to the file list. */
1830                                 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1831                                                             SEC_ACE_FLAG_CONTAINER_INHERIT|
1832                                                             SEC_ACE_FLAG_INHERIT_ONLY);
1833                         } else {
1834                                 /*
1835                                  * We must not free current_ace here as its
1836                                  * pointer is now owned by the dir_ace list.
1837                                  */
1838                                 current_ace = NULL;
1839                         }
1840
1841                         /*
1842                          * current_ace is now either owned by file_ace
1843                          * or is NULL. We can safely operate on current_dir_ace
1844                          * to treat mapping for default acl entries differently
1845                          * than access acl entries.
1846                          */
1847
1848                         if (current_dir_ace->owner_type == UID_ACE) {
1849                                 /*
1850                                  * We already decided above this is a uid,
1851                                  * for default acls ace's only CREATOR_OWNER
1852                                  * maps to ACL_USER_OBJ. All other uid
1853                                  * ace's are ACL_USER.
1854                                  */
1855                                 if (dom_sid_equal(&current_dir_ace->trustee,
1856                                                   &global_sid_Creator_Owner)) {
1857                                         current_dir_ace->type = SMB_ACL_USER_OBJ;
1858                                 } else {
1859                                         current_dir_ace->type = SMB_ACL_USER;
1860                                 }
1861                         }
1862
1863                         if (current_dir_ace->owner_type == GID_ACE) {
1864                                 /*
1865                                  * We already decided above this is a gid,
1866                                  * for default acls ace's only CREATOR_GROUP
1867                                  * maps to ACL_GROUP_OBJ. All other uid
1868                                  * ace's are ACL_GROUP.
1869                                  */
1870                                 if (dom_sid_equal(&current_dir_ace->trustee,
1871                                                   &global_sid_Creator_Group)) {
1872                                         current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1873                                 } else {
1874                                         current_dir_ace->type = SMB_ACL_GROUP;
1875                                 }
1876                         }
1877                 }
1878         }
1879
1880         /*
1881          * Only add to the file ACL if not inherit only.
1882          */
1883
1884         if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1885                 DLIST_ADD_END(*file_ace, current_ace, canon_ace *);
1886
1887                 /*
1888                  * Note if this was an allow ace. We can't process
1889                  * any further deny ace's after this.
1890                  */
1891
1892                 if (current_ace->attr == ALLOW_ACE)
1893                         *got_file_allow = True;
1894
1895                 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1896                         DEBUG(0,("add_current_ace_to_acl: malformed "
1897                                  "ACL in file ACL ! Deny entry after "
1898                                  "Allow entry. Failing to set on file "
1899                                  "%s.\n", fsp_str_dbg(fsp)));
1900                         return False;
1901                 }
1902
1903                 if( DEBUGLVL( 10 )) {
1904                         dbgtext("add_current_ace_to_acl: adding file ACL:\n");
1905                         print_canon_ace( current_ace, 0);
1906                 }
1907                 *all_aces_are_inherit_only = False;
1908                 /*
1909                  * We must not free current_ace here as its
1910                  * pointer is now owned by the file_ace list.
1911                  */
1912                 current_ace = NULL;
1913         }
1914
1915         /*
1916          * Free if ACE was not added.
1917          */
1918
1919         TALLOC_FREE(current_ace);
1920         return true;
1921 }
1922
1923 /****************************************************************************
1924  Unpack a struct security_descriptor into two canonical ace lists.
1925 ****************************************************************************/
1926
1927 static bool create_canon_ace_lists(files_struct *fsp,
1928                                         const SMB_STRUCT_STAT *pst,
1929                                         struct dom_sid *pfile_owner_sid,
1930                                         struct dom_sid *pfile_grp_sid,
1931                                         canon_ace **ppfile_ace,
1932                                         canon_ace **ppdir_ace,
1933                                         const struct security_acl *dacl)
1934 {
1935         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1936         canon_ace *file_ace = NULL;
1937         canon_ace *dir_ace = NULL;
1938         canon_ace *current_ace = NULL;
1939         bool got_dir_allow = False;
1940         bool got_file_allow = False;
1941         int i, j;
1942
1943         *ppfile_ace = NULL;
1944         *ppdir_ace = NULL;
1945
1946         /*
1947          * Convert the incoming ACL into a more regular form.
1948          */
1949
1950         for(i = 0; i < dacl->num_aces; i++) {
1951                 struct security_ace *psa = &dacl->aces[i];
1952
1953                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1954                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1955                         return False;
1956                 }
1957
1958                 if (nt4_compatible_acls()) {
1959                         /*
1960                          * The security mask may be UNIX_ACCESS_NONE which should map into
1961                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1962                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1963                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1964                          */
1965
1966                         /*
1967                          * Convert GENERIC bits to specific bits.
1968                          */
1969
1970                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1971
1972                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1973
1974                         if(psa->access_mask != UNIX_ACCESS_NONE)
1975                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1976                 }
1977         }
1978
1979         /*
1980          * Deal with the fact that NT 4.x re-writes the canonical format
1981          * that we return for default ACLs. If a directory ACE is identical
1982          * to a inherited directory ACE then NT changes the bits so that the
1983          * first ACE is set to OI|IO and the second ACE for this SID is set
1984          * to CI. We need to repair this. JRA.
1985          */
1986
1987         for(i = 0; i < dacl->num_aces; i++) {
1988                 struct security_ace *psa1 = &dacl->aces[i];
1989
1990                 for (j = i + 1; j < dacl->num_aces; j++) {
1991                         struct security_ace *psa2 = &dacl->aces[j];
1992
1993                         if (psa1->access_mask != psa2->access_mask)
1994                                 continue;
1995
1996                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1997                                 continue;
1998
1999                         /*
2000                          * Ok - permission bits and SIDs are equal.
2001                          * Check if flags were re-written.
2002                          */
2003
2004                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
2005
2006                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
2007                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
2008
2009                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
2010
2011                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
2012                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
2013
2014                         }
2015                 }
2016         }
2017
2018         for(i = 0; i < dacl->num_aces; i++) {
2019                 struct security_ace *psa = &dacl->aces[i];
2020
2021                 /*
2022                  * Create a canon_ace entry representing this NT DACL ACE.
2023                  */
2024
2025                 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
2026                         free_canon_ace_list(file_ace);
2027                         free_canon_ace_list(dir_ace);
2028                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
2029                         return False;
2030                 }
2031
2032                 ZERO_STRUCTP(current_ace);
2033
2034                 sid_copy(&current_ace->trustee, &psa->trustee);
2035
2036                 /*
2037                  * Try and work out if the SID is a user or group
2038                  * as we need to flag these differently for POSIX.
2039                  * Note what kind of a POSIX ACL this should map to.
2040                  */
2041
2042                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
2043                         current_ace->owner_type = WORLD_ACE;
2044                         current_ace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
2045                         current_ace->unix_ug.id = -1;
2046                         current_ace->type = SMB_ACL_OTHER;
2047                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
2048                         current_ace->owner_type = UID_ACE;
2049                         current_ace->unix_ug.type = ID_TYPE_UID;
2050                         current_ace->unix_ug.id = pst->st_ex_uid;
2051                         current_ace->type = SMB_ACL_USER_OBJ;
2052
2053                         /*
2054                          * The Creator Owner entry only specifies inheritable permissions,
2055                          * never access permissions. WinNT doesn't always set the ACE to
2056                          * INHERIT_ONLY, though.
2057                          */
2058
2059                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
2060
2061                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
2062                         current_ace->owner_type = GID_ACE;
2063                         current_ace->unix_ug.type = ID_TYPE_GID;
2064                         current_ace->unix_ug.id = pst->st_ex_gid;
2065                         current_ace->type = SMB_ACL_GROUP_OBJ;
2066
2067                         /*
2068                          * The Creator Group entry only specifies inheritable permissions,
2069                          * never access permissions. WinNT doesn't always set the ACE to
2070                          * INHERIT_ONLY, though.
2071                          */
2072                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
2073
2074                 } else {
2075                         struct unixid unixid;
2076
2077                         if (!sids_to_unixids(&current_ace->trustee, 1, &unixid)) {
2078                                 free_canon_ace_list(file_ace);
2079                                 free_canon_ace_list(dir_ace);
2080                                 TALLOC_FREE(current_ace);
2081                                 DEBUG(0, ("create_canon_ace_lists: sids_to_unixids "
2082                                         "failed for %s (allocation failure)\n",
2083                                         sid_string_dbg(&current_ace->trustee)));
2084                                 return false;
2085                         }
2086
2087                         if (unixid.type == ID_TYPE_BOTH) {
2088                                 /* If it's the owning user, this is a
2089                                  * user_obj, not a user.  This way, we
2090                                  * get a valid ACL for groups that own
2091                                  * files, without putting user ACL
2092                                  * entries in for groups otherwise */
2093                                 if (unixid.id == pst->st_ex_uid) {
2094                                         current_ace->owner_type = UID_ACE;
2095                                         current_ace->unix_ug.type = ID_TYPE_UID;
2096                                         current_ace->unix_ug.id = unixid.id;
2097                                         current_ace->type = SMB_ACL_USER_OBJ;
2098
2099                                         /* Add the user object to the posix ACL,
2100                                            and proceed to the group mapping
2101                                            below. This handles the talloc_free
2102                                            of current_ace if not added for some
2103                                            reason */
2104                                         if (!add_current_ace_to_acl(fsp,
2105                                                         psa,
2106                                                         &file_ace,
2107                                                         &dir_ace,
2108                                                         &got_file_allow,
2109                                                         &got_dir_allow,
2110                                                         &all_aces_are_inherit_only,
2111                                                         current_ace)) {
2112                                                 free_canon_ace_list(file_ace);
2113                                                 free_canon_ace_list(dir_ace);
2114                                                 return false;
2115                                         }
2116
2117                                         if ((current_ace = talloc(talloc_tos(),
2118                                                         canon_ace)) == NULL) {
2119                                                 free_canon_ace_list(file_ace);
2120                                                 free_canon_ace_list(dir_ace);
2121                                                 DEBUG(0,("create_canon_ace_lists: "
2122                                                         "malloc fail.\n"));
2123                                                 return False;
2124                                         }
2125
2126                                         ZERO_STRUCTP(current_ace);
2127                                 }
2128
2129                                 sid_copy(&current_ace->trustee, &psa->trustee);
2130
2131                                 current_ace->unix_ug.type = ID_TYPE_GID;
2132                                 current_ace->unix_ug.id = unixid.id;
2133                                 current_ace->owner_type = GID_ACE;
2134                                 /* If it's the primary group, this is a
2135                                    group_obj, not a group. */
2136                                 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2137                                         current_ace->type = SMB_ACL_GROUP_OBJ;
2138                                 } else {
2139                                         current_ace->type = SMB_ACL_GROUP;
2140                                 }
2141
2142                         } else if (unixid.type == ID_TYPE_UID) {
2143                                 current_ace->owner_type = UID_ACE;
2144                                 current_ace->unix_ug.type = ID_TYPE_UID;
2145                                 current_ace->unix_ug.id = unixid.id;
2146                                 /* If it's the owning user, this is a user_obj,
2147                                    not a user. */
2148                                 if (current_ace->unix_ug.id == pst->st_ex_uid) {
2149                                         current_ace->type = SMB_ACL_USER_OBJ;
2150                                 } else {
2151                                         current_ace->type = SMB_ACL_USER;
2152                                 }
2153                         } else if (unixid.type == ID_TYPE_GID) {
2154                                 current_ace->unix_ug.type = ID_TYPE_GID;
2155                                 current_ace->unix_ug.id = unixid.id;
2156                                 current_ace->owner_type = GID_ACE;
2157                                 /* If it's the primary group, this is a
2158                                    group_obj, not a group. */
2159                                 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2160                                         current_ace->type = SMB_ACL_GROUP_OBJ;
2161                                 } else {
2162                                         current_ace->type = SMB_ACL_GROUP;
2163                                 }
2164                         } else {
2165                                 /*
2166                                  * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
2167                                  */
2168
2169                                 if (non_mappable_sid(&psa->trustee)) {
2170                                         DEBUG(10, ("create_canon_ace_lists: ignoring "
2171                                                    "non-mappable SID %s\n",
2172                                                    sid_string_dbg(&psa->trustee)));
2173                                         TALLOC_FREE(current_ace);
2174                                         continue;
2175                                 }
2176
2177                                 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
2178                                         DEBUG(10, ("create_canon_ace_lists: ignoring "
2179                                                 "unknown or foreign SID %s\n",
2180                                                 sid_string_dbg(&psa->trustee)));
2181                                         TALLOC_FREE(current_ace);
2182                                         continue;
2183                                 }
2184
2185                                 free_canon_ace_list(file_ace);
2186                                 free_canon_ace_list(dir_ace);
2187                                 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
2188                                           "%s to uid or gid.\n",
2189                                           sid_string_dbg(&current_ace->trustee)));
2190                                 TALLOC_FREE(current_ace);
2191                                 return false;
2192                         }
2193                 }
2194
2195                 /* handles the talloc_free of current_ace if not added for some reason */
2196                 if (!add_current_ace_to_acl(fsp, psa, &file_ace, &dir_ace,
2197                                             &got_file_allow, &got_dir_allow,
2198                                             &all_aces_are_inherit_only, current_ace)) {
2199                         free_canon_ace_list(file_ace);
2200                         free_canon_ace_list(dir_ace);
2201                         return false;
2202                 }
2203         }
2204
2205         if (fsp->is_directory && all_aces_are_inherit_only) {
2206                 /*
2207                  * Windows 2000 is doing one of these weird 'inherit acl'
2208                  * traverses to conserve NTFS ACL resources. Just pretend
2209                  * there was no DACL sent. JRA.
2210                  */
2211
2212                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
2213                 free_canon_ace_list(file_ace);
2214                 free_canon_ace_list(dir_ace);
2215                 file_ace = NULL;
2216                 dir_ace = NULL;
2217         } else {
2218                 /*
2219                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
2220                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
2221                  * entries can be converted to *_OBJ. Don't do this for the default
2222                  * ACL, we will create them separately for this if needed inside
2223                  * ensure_canon_entry_valid_on_set().
2224                  */
2225                 if (file_ace) {
2226                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
2227                 }
2228         }
2229
2230         *ppfile_ace = file_ace;
2231         *ppdir_ace = dir_ace;
2232
2233         return True;
2234 }
2235
2236 /****************************************************************************
2237  ASCII art time again... JRA :-).
2238
2239  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2240  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2241  entries). Secondly, the merge code has ensured that all duplicate SID entries for
2242  allow or deny have been merged, so the same SID can only appear once in the deny
2243  list or once in the allow list.
2244
2245  We then process as follows :
2246
2247  ---------------------------------------------------------------------------
2248  First pass - look for a Everyone DENY entry.
2249
2250  If it is deny all (rwx) trunate the list at this point.
2251  Else, walk the list from this point and use the deny permissions of this
2252  entry as a mask on all following allow entries. Finally, delete
2253  the Everyone DENY entry (we have applied it to everything possible).
2254
2255  In addition, in this pass we remove any DENY entries that have
2256  no permissions (ie. they are a DENY nothing).
2257  ---------------------------------------------------------------------------
2258  Second pass - only deal with deny user entries.
2259
2260  DENY user1 (perms XXX)
2261
2262  new_perms = 0
2263  for all following allow group entries where user1 is in group
2264         new_perms |= group_perms;
2265
2266  user1 entry perms = new_perms & ~ XXX;
2267
2268  Convert the deny entry to an allow entry with the new perms and
2269  push to the end of the list. Note if the user was in no groups
2270  this maps to a specific allow nothing entry for this user.
2271
2272  The common case from the NT ACL choser (userX deny all) is
2273  optimised so we don't do the group lookup - we just map to
2274  an allow nothing entry.
2275
2276  What we're doing here is inferring the allow permissions the
2277  person setting the ACE on user1 wanted by looking at the allow
2278  permissions on the groups the user is currently in. This will
2279  be a snapshot, depending on group membership but is the best
2280  we can do and has the advantage of failing closed rather than
2281  open.
2282  ---------------------------------------------------------------------------
2283  Third pass - only deal with deny group entries.
2284
2285  DENY group1 (perms XXX)
2286
2287  for all following allow user entries where user is in group1
2288    user entry perms = user entry perms & ~ XXX;
2289
2290  If there is a group Everyone allow entry with permissions YYY,
2291  convert the group1 entry to an allow entry and modify its
2292  permissions to be :
2293
2294  new_perms = YYY & ~ XXX
2295
2296  and push to the end of the list.
2297
2298  If there is no group Everyone allow entry then convert the
2299  group1 entry to a allow nothing entry and push to the end of the list.
2300
2301  Note that the common case from the NT ACL choser (groupX deny all)
2302  cannot be optimised here as we need to modify user entries who are
2303  in the group to change them to a deny all also.
2304
2305  What we're doing here is modifying the allow permissions of
2306  user entries (which are more specific in POSIX ACLs) to mask
2307  out the explicit deny set on the group they are in. This will
2308  be a snapshot depending on current group membership but is the
2309  best we can do and has the advantage of failing closed rather
2310  than open.
2311  ---------------------------------------------------------------------------
2312  Fourth pass - cope with cumulative permissions.
2313
2314  for all allow user entries, if there exists an allow group entry with
2315  more permissive permissions, and the user is in that group, rewrite the
2316  allow user permissions to contain both sets of permissions.
2317
2318  Currently the code for this is #ifdef'ed out as these semantics make
2319  no sense to me. JRA.
2320  ---------------------------------------------------------------------------
2321
2322  Note we *MUST* do the deny user pass first as this will convert deny user
2323  entries into allow user entries which can then be processed by the deny
2324  group pass.
2325
2326  The above algorithm took a *lot* of thinking about - hence this
2327  explaination :-). JRA.
2328 ****************************************************************************/
2329
2330 /****************************************************************************
2331  Process a canon_ace list entries. This is very complex code. We need
2332  to go through and remove the "deny" permissions from any allow entry that matches
2333  the id of this entry. We have already refused any NT ACL that wasn't in correct
2334  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2335  we just remove it (to fail safe). We have already removed any duplicate ace
2336  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2337  allow entries.
2338 ****************************************************************************/
2339
2340 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2341 {
2342         canon_ace *ace_list = *pp_ace_list;
2343         canon_ace *curr_ace = NULL;
2344         canon_ace *curr_ace_next = NULL;
2345
2346         /* Pass 1 above - look for an Everyone, deny entry. */
2347
2348         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2349                 canon_ace *allow_ace_p;
2350
2351                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2352
2353                 if (curr_ace->attr != DENY_ACE)
2354                         continue;
2355
2356                 if (curr_ace->perms == (mode_t)0) {
2357
2358                         /* Deny nothing entry - delete. */
2359
2360                         DLIST_REMOVE(ace_list, curr_ace);
2361                         continue;
2362                 }
2363
2364                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2365                         continue;
2366
2367                 /* JRATEST - assert. */
2368                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2369
2370                 if (curr_ace->perms == ALL_ACE_PERMS) {
2371
2372                         /*
2373                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2374                          * list at this point including this entry.
2375                          */
2376
2377                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2378
2379                         free_canon_ace_list( curr_ace );
2380                         if (prev_entry)
2381                                 DLIST_REMOVE(ace_list, prev_entry);
2382                         else {
2383                                 /* We deleted the entire list. */
2384                                 ace_list = NULL;
2385                         }
2386                         break;
2387                 }
2388
2389                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2390
2391                         /*
2392                          * Only mask off allow entries.
2393                          */
2394
2395                         if (allow_ace_p->attr != ALLOW_ACE)
2396                                 continue;
2397
2398                         allow_ace_p->perms &= ~curr_ace->perms;
2399                 }
2400
2401                 /*
2402                  * Now it's been applied, remove it.
2403                  */
2404
2405                 DLIST_REMOVE(ace_list, curr_ace);
2406         }
2407
2408         /* Pass 2 above - deal with deny user entries. */
2409
2410         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2411                 mode_t new_perms = (mode_t)0;
2412                 canon_ace *allow_ace_p;
2413
2414                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2415
2416                 if (curr_ace->attr != DENY_ACE)
2417                         continue;
2418
2419                 if (curr_ace->owner_type != UID_ACE)
2420                         continue;
2421
2422                 if (curr_ace->perms == ALL_ACE_PERMS) {
2423
2424                         /*
2425                          * Optimisation - this is a deny everything to this user.
2426                          * Convert to an allow nothing and push to the end of the list.
2427                          */
2428
2429                         curr_ace->attr = ALLOW_ACE;
2430                         curr_ace->perms = (mode_t)0;
2431                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2432                         continue;
2433                 }
2434
2435                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2436
2437                         if (allow_ace_p->attr != ALLOW_ACE)
2438                                 continue;
2439
2440                         /* We process GID_ACE and WORLD_ACE entries only. */
2441
2442                         if (allow_ace_p->owner_type == UID_ACE)
2443                                 continue;
2444
2445                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2446                                 new_perms |= allow_ace_p->perms;
2447                 }
2448
2449                 /*
2450                  * Convert to a allow entry, modify the perms and push to the end
2451                  * of the list.
2452                  */
2453
2454                 curr_ace->attr = ALLOW_ACE;
2455                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2456                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2457         }
2458
2459         /* Pass 3 above - deal with deny group entries. */
2460
2461         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2462                 canon_ace *allow_ace_p;
2463                 canon_ace *allow_everyone_p = NULL;
2464
2465                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2466
2467                 if (curr_ace->attr != DENY_ACE)
2468                         continue;
2469
2470                 if (curr_ace->owner_type != GID_ACE)
2471                         continue;
2472
2473                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2474
2475                         if (allow_ace_p->attr != ALLOW_ACE)
2476                                 continue;
2477
2478                         /* Store a pointer to the Everyone allow, if it exists. */
2479                         if (allow_ace_p->owner_type == WORLD_ACE)
2480                                 allow_everyone_p = allow_ace_p;
2481
2482                         /* We process UID_ACE entries only. */
2483
2484                         if (allow_ace_p->owner_type != UID_ACE)
2485                                 continue;
2486
2487                         /* Mask off the deny group perms. */
2488
2489                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2490                                 allow_ace_p->perms &= ~curr_ace->perms;
2491                 }
2492
2493                 /*
2494                  * Convert the deny to an allow with the correct perms and
2495                  * push to the end of the list.
2496                  */
2497
2498                 curr_ace->attr = ALLOW_ACE;
2499                 if (allow_everyone_p)
2500                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2501                 else
2502                         curr_ace->perms = (mode_t)0;
2503                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2504         }
2505
2506         /* Doing this fourth pass allows Windows semantics to be layered
2507          * on top of POSIX semantics. I'm not sure if this is desirable.
2508          * For example, in W2K ACLs there is no way to say, "Group X no
2509          * access, user Y full access" if user Y is a member of group X.
2510          * This seems completely broken semantics to me.... JRA.
2511          */
2512
2513 #if 0
2514         /* Pass 4 above - deal with allow entries. */
2515
2516         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2517                 canon_ace *allow_ace_p;
2518
2519                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2520
2521                 if (curr_ace->attr != ALLOW_ACE)
2522                         continue;
2523
2524                 if (curr_ace->owner_type != UID_ACE)
2525                         continue;
2526
2527                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2528
2529                         if (allow_ace_p->attr != ALLOW_ACE)
2530                                 continue;
2531
2532                         /* We process GID_ACE entries only. */
2533
2534                         if (allow_ace_p->owner_type != GID_ACE)
2535                                 continue;
2536
2537                         /* OR in the group perms. */
2538
2539                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2540                                 curr_ace->perms |= allow_ace_p->perms;
2541                 }
2542         }
2543 #endif
2544
2545         *pp_ace_list = ace_list;
2546 }
2547
2548 /****************************************************************************
2549  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2550  succeeding.
2551 ****************************************************************************/
2552
2553 static bool unpack_canon_ace(files_struct *fsp,
2554                                 const SMB_STRUCT_STAT *pst,
2555                                 struct dom_sid *pfile_owner_sid,
2556                                 struct dom_sid *pfile_grp_sid,
2557                                 canon_ace **ppfile_ace,
2558                                 canon_ace **ppdir_ace,
2559                                 uint32 security_info_sent,
2560                                 const struct security_descriptor *psd)
2561 {
2562         canon_ace *file_ace = NULL;
2563         canon_ace *dir_ace = NULL;
2564
2565         *ppfile_ace = NULL;
2566         *ppdir_ace = NULL;
2567
2568         if(security_info_sent == 0) {
2569                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2570                 return False;
2571         }
2572
2573         /*
2574          * If no DACL then this is a chown only security descriptor.
2575          */
2576
2577         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2578                 return True;
2579
2580         /*
2581          * Now go through the DACL and create the canon_ace lists.
2582          */
2583
2584         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2585                                                                 &file_ace, &dir_ace, psd->dacl))
2586                 return False;
2587
2588         if ((file_ace == NULL) && (dir_ace == NULL)) {
2589                 /* W2K traverse DACL set - ignore. */
2590                 return True;
2591         }
2592
2593         /*
2594          * Go through the canon_ace list and merge entries
2595          * belonging to identical users of identical allow or deny type.
2596          * We can do this as all deny entries come first, followed by
2597          * all allow entries (we have mandated this before accepting this acl).
2598          */
2599
2600         print_canon_ace_list( "file ace - before merge", file_ace);
2601         merge_aces( &file_ace, false);
2602
2603         print_canon_ace_list( "dir ace - before merge", dir_ace);
2604         merge_aces( &dir_ace, true);
2605
2606         /*
2607          * NT ACLs are order dependent. Go through the acl lists and
2608          * process DENY entries by masking the allow entries.
2609          */
2610
2611         print_canon_ace_list( "file ace - before deny", file_ace);
2612         process_deny_list(fsp->conn, &file_ace);
2613
2614         print_canon_ace_list( "dir ace - before deny", dir_ace);
2615         process_deny_list(fsp->conn, &dir_ace);
2616
2617         /*
2618          * A well formed POSIX file or default ACL has at least 3 entries, a
2619          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2620          * and optionally a mask entry. Ensure this is the case.
2621          */
2622
2623         print_canon_ace_list( "file ace - before valid", file_ace);
2624
2625         if (!ensure_canon_entry_valid_on_set(fsp->conn, &file_ace, false, fsp->conn->params,
2626                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2627                 free_canon_ace_list(file_ace);
2628                 free_canon_ace_list(dir_ace);
2629                 return False;
2630         }
2631
2632         print_canon_ace_list( "dir ace - before valid", dir_ace);
2633
2634         if (dir_ace && !ensure_canon_entry_valid_on_set(fsp->conn, &dir_ace, true, fsp->conn->params,
2635                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2636                 free_canon_ace_list(file_ace);
2637                 free_canon_ace_list(dir_ace);
2638                 return False;
2639         }
2640
2641         print_canon_ace_list( "file ace - return", file_ace);
2642         print_canon_ace_list( "dir ace - return", dir_ace);
2643
2644         *ppfile_ace = file_ace;
2645         *ppdir_ace = dir_ace;
2646         return True;
2647
2648 }
2649
2650 /******************************************************************************
2651  When returning permissions, try and fit NT display
2652  semantics if possible. Note the the canon_entries here must have been malloced.
2653  The list format should be - first entry = owner, followed by group and other user
2654  entries, last entry = other.
2655
2656  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2657  are not ordered, and match on the most specific entry rather than walking a list,
2658  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2659
2660  Entry 0: owner : deny all except read and write.
2661  Entry 1: owner : allow read and write.
2662  Entry 2: group : deny all except read.
2663  Entry 3: group : allow read.
2664  Entry 4: Everyone : allow read.
2665
2666  But NT cannot display this in their ACL editor !
2667 ********************************************************************************/
2668
2669 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2670 {
2671         canon_ace *l_head = *pp_list_head;
2672         canon_ace *owner_ace = NULL;
2673         canon_ace *other_ace = NULL;
2674         canon_ace *ace = NULL;
2675
2676         for (ace = l_head; ace; ace = ace->next) {
2677                 if (ace->type == SMB_ACL_USER_OBJ)
2678                         owner_ace = ace;
2679                 else if (ace->type == SMB_ACL_OTHER) {
2680                         /* Last ace - this is "other" */
2681                         other_ace = ace;
2682                 }
2683         }
2684
2685         if (!owner_ace || !other_ace) {
2686                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2687                         filename ));
2688                 return;
2689         }
2690
2691         /*
2692          * The POSIX algorithm applies to owner first, and other last,
2693          * so ensure they are arranged in this order.
2694          */
2695
2696         if (owner_ace) {
2697                 DLIST_PROMOTE(l_head, owner_ace);
2698         }
2699
2700         if (other_ace) {
2701                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2702         }
2703
2704         /* We have probably changed the head of the list. */
2705
2706         *pp_list_head = l_head;
2707 }
2708
2709 /****************************************************************************
2710  Create a linked list of canonical ACE entries.
2711 ****************************************************************************/
2712
2713 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2714                                    const char *fname, SMB_ACL_T posix_acl,
2715                                    const SMB_STRUCT_STAT *psbuf,
2716                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2717 {
2718         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2719         canon_ace *l_head = NULL;
2720         canon_ace *ace = NULL;
2721         canon_ace *next_ace = NULL;
2722         int entry_id = SMB_ACL_FIRST_ENTRY;
2723         bool is_default_acl = (the_acl_type == SMB_ACL_TYPE_DEFAULT);
2724         SMB_ACL_ENTRY_T entry;
2725         size_t ace_count;
2726
2727         while ( posix_acl && (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1)) {
2728                 SMB_ACL_TAG_T tagtype;
2729                 SMB_ACL_PERMSET_T permset;
2730                 struct dom_sid sid;
2731                 struct unixid unix_ug;
2732                 enum ace_owner owner_type;
2733
2734                 entry_id = SMB_ACL_NEXT_ENTRY;
2735
2736                 /* Is this a MASK entry ? */
2737                 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
2738                         continue;
2739
2740                 if (sys_acl_get_permset(entry, &permset) == -1)
2741                         continue;
2742
2743                 /* Decide which SID to use based on the ACL type. */
2744                 switch(tagtype) {
2745                         case SMB_ACL_USER_OBJ:
2746                                 /* Get the SID from the owner. */
2747                                 sid_copy(&sid, powner);
2748                                 unix_ug.type = ID_TYPE_UID;
2749                                 unix_ug.id = psbuf->st_ex_uid;
2750                                 owner_type = UID_ACE;
2751                                 break;
2752                         case SMB_ACL_USER:
2753                                 {
2754                                         uid_t *puid = (uid_t *)sys_acl_get_qualifier(entry);
2755                                         if (puid == NULL) {
2756                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2757                                                 continue;
2758                                         }
2759                                         uid_to_sid( &sid, *puid);
2760                                         unix_ug.type = ID_TYPE_UID;
2761                                         unix_ug.id = *puid;
2762                                         owner_type = UID_ACE;
2763                                         break;
2764                                 }
2765                         case SMB_ACL_GROUP_OBJ:
2766                                 /* Get the SID from the owning group. */
2767                                 sid_copy(&sid, pgroup);
2768                                 unix_ug.type = ID_TYPE_GID;
2769                                 unix_ug.id = psbuf->st_ex_gid;
2770                                 owner_type = GID_ACE;
2771                                 break;
2772                         case SMB_ACL_GROUP:
2773                                 {
2774                                         gid_t *pgid = (gid_t *)sys_acl_get_qualifier(entry);
2775                                         if (pgid == NULL) {
2776                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2777                                                 continue;
2778                                         }
2779                                         gid_to_sid( &sid, *pgid);
2780                                         unix_ug.type = ID_TYPE_GID;
2781                                         unix_ug.id = *pgid;
2782                                         owner_type = GID_ACE;
2783                                         break;
2784                                 }
2785                         case SMB_ACL_MASK:
2786                                 acl_mask = convert_permset_to_mode_t(permset);
2787                                 continue; /* Don't count the mask as an entry. */
2788                         case SMB_ACL_OTHER:
2789                                 /* Use the Everyone SID */
2790                                 sid = global_sid_World;
2791                                 unix_ug.type = ID_TYPE_NOT_SPECIFIED;
2792                                 unix_ug.id = -1;
2793                                 owner_type = WORLD_ACE;
2794                                 break;
2795                         default:
2796                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2797                                 continue;
2798                 }
2799
2800                 /*
2801                  * Add this entry to the list.
2802                  */
2803
2804                 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2805                         goto fail;
2806
2807                 ZERO_STRUCTP(ace);
2808                 ace->type = tagtype;
2809                 ace->perms = convert_permset_to_mode_t(permset);
2810                 ace->attr = ALLOW_ACE;
2811                 ace->trustee = sid;
2812                 ace->unix_ug = unix_ug;
2813                 ace->owner_type = owner_type;
2814                 ace->ace_flags = get_pai_flags(pal, ace, is_default_acl);
2815
2816                 DLIST_ADD(l_head, ace);
2817         }
2818
2819         /*
2820          * This next call will ensure we have at least a user/group/world set.
2821          */
2822
2823         if (!ensure_canon_entry_valid_on_get(conn, &l_head,
2824                                       powner, pgroup,
2825                                       psbuf))
2826                 goto fail;
2827
2828         /*
2829          * Now go through the list, masking the permissions with the
2830          * acl_mask. Ensure all DENY Entries are at the start of the list.
2831          */
2832
2833         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", is_default_acl ?  "Default" : "Access"));
2834
2835         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2836                 next_ace = ace->next;
2837
2838                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2839                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2840                         ace->perms &= acl_mask;
2841
2842                 if (ace->perms == 0) {
2843                         DLIST_PROMOTE(l_head, ace);
2844                 }
2845
2846                 if( DEBUGLVL( 10 ) ) {
2847                         print_canon_ace(ace, ace_count);
2848                 }
2849         }
2850
2851         arrange_posix_perms(fname,&l_head );
2852
2853         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2854
2855         return l_head;
2856
2857   fail:
2858
2859         free_canon_ace_list(l_head);
2860         return NULL;
2861 }
2862
2863 /****************************************************************************
2864  Check if the current user group list contains a given group.
2865 ****************************************************************************/
2866
2867 bool current_user_in_group(connection_struct *conn, gid_t gid)
2868 {
2869         int i;
2870         const struct security_unix_token *utok = get_current_utok(conn);
2871
2872         for (i = 0; i < utok->ngroups; i++) {
2873                 if (utok->groups[i] == gid) {
2874                         return True;
2875                 }
2876         }
2877
2878         return False;
2879 }
2880
2881 /****************************************************************************
2882  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2883 ****************************************************************************/
2884
2885 static bool acl_group_override(connection_struct *conn,
2886                                const struct smb_filename *smb_fname)
2887 {
2888         if ((errno != EPERM) && (errno != EACCES)) {
2889                 return false;
2890         }
2891
2892         /* file primary group == user primary or supplementary group */
2893         if (lp_acl_group_control(SNUM(conn)) &&
2894             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2895                 return true;
2896         }
2897
2898         /* user has writeable permission */
2899         if (lp_dos_filemode(SNUM(conn)) &&
2900             can_write_to_file(conn, smb_fname)) {
2901                 return true;
2902         }
2903
2904         return false;
2905 }
2906
2907 /****************************************************************************
2908  Attempt to apply an ACL to a file or directory.
2909 ****************************************************************************/
2910
2911 static bool set_canon_ace_list(files_struct *fsp,
2912                                 canon_ace *the_ace,
2913                                 bool default_ace,
2914                                 const SMB_STRUCT_STAT *psbuf,
2915                                 bool *pacl_set_support)
2916 {
2917         connection_struct *conn = fsp->conn;
2918         bool ret = False;
2919         SMB_ACL_T the_acl = sys_acl_init(talloc_tos());
2920         canon_ace *p_ace;
2921         int i;
2922         SMB_ACL_ENTRY_T mask_entry;
2923         bool got_mask_entry = False;
2924         SMB_ACL_PERMSET_T mask_permset;
2925         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2926         bool needs_mask = False;
2927         mode_t mask_perms = 0;
2928
2929         /* Use the psbuf that was passed in. */
2930         if (psbuf != &fsp->fsp_name->st) {
2931                 fsp->fsp_name->st = *psbuf;
2932         }
2933
2934 #if defined(POSIX_ACL_NEEDS_MASK)
2935         /* HP-UX always wants to have a mask (called "class" there). */
2936         needs_mask = True;
2937 #endif
2938
2939         if (the_acl == NULL) {
2940                 DEBUG(0, ("sys_acl_init failed to allocate an ACL\n"));
2941                 return false;
2942         }
2943
2944         if( DEBUGLVL( 10 )) {
2945                 dbgtext("set_canon_ace_list: setting ACL:\n");
2946                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2947                         print_canon_ace( p_ace, i);
2948                 }
2949         }
2950
2951         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2952                 SMB_ACL_ENTRY_T the_entry;
2953                 SMB_ACL_PERMSET_T the_permset;
2954
2955                 /*
2956                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2957                  * named group entries. But if there is an ACL_MASK entry, it applies
2958                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2959                  * so that it doesn't deny (i.e., mask off) any permissions.
2960                  */
2961
2962                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2963                         needs_mask = True;
2964                         mask_perms |= p_ace->perms;
2965                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2966                         mask_perms |= p_ace->perms;
2967                 }
2968
2969                 /*
2970                  * Get the entry for this ACE.
2971                  */
2972
2973                 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
2974                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2975                                 i, strerror(errno) ));
2976                         goto fail;
2977                 }
2978
2979                 if (p_ace->type == SMB_ACL_MASK) {
2980                         mask_entry = the_entry;
2981                         got_mask_entry = True;
2982                 }
2983
2984                 /*
2985                  * Ok - we now know the ACL calls should be working, don't
2986                  * allow fallback to chmod.
2987                  */
2988
2989                 *pacl_set_support = True;
2990
2991                 /*
2992                  * Initialise the entry from the canon_ace.
2993                  */
2994
2995                 /*
2996                  * First tell the entry what type of ACE this is.
2997                  */
2998
2999                 if (sys_acl_set_tag_type(the_entry, p_ace->type) == -1) {
3000                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
3001                                 i, strerror(errno) ));
3002                         goto fail;
3003                 }
3004
3005                 /*
3006                  * Only set the qualifier (user or group id) if the entry is a user
3007                  * or group id ACE.
3008                  */
3009
3010                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
3011                         if (sys_acl_set_qualifier(the_entry,(void *)&p_ace->unix_ug.id) == -1) {
3012                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
3013                                         i, strerror(errno) ));
3014                                 goto fail;
3015                         }
3016                 }
3017
3018                 /*
3019                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
3020                  */
3021
3022                 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
3023                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
3024                                 i, strerror(errno) ));
3025                         goto fail;
3026                 }
3027
3028                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
3029                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
3030                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
3031                         goto fail;
3032                 }
3033
3034                 /*
3035                  * ..and apply them to the entry.
3036                  */
3037
3038                 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
3039                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
3040                                 i, strerror(errno) ));
3041                         goto fail;
3042                 }
3043
3044                 if( DEBUGLVL( 10 ))
3045                         print_canon_ace( p_ace, i);
3046
3047         }
3048
3049         if (needs_mask && !got_mask_entry) {
3050                 if (sys_acl_create_entry(&the_acl, &mask_entry) == -1) {
3051                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
3052                         goto fail;
3053                 }
3054
3055                 if (sys_acl_set_tag_type(mask_entry, SMB_ACL_MASK) == -1) {
3056                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
3057                         goto fail;
3058                 }
3059
3060                 if (sys_acl_get_permset(mask_entry, &mask_permset) == -1) {
3061                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
3062                         goto fail;
3063                 }
3064
3065                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
3066                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
3067                         goto fail;
3068                 }
3069
3070                 if (sys_acl_set_permset(mask_entry, mask_permset) == -1) {
3071                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
3072                         goto fail;
3073                 }
3074         }
3075
3076         /*
3077          * Finally apply it to the file or directory.
3078          */
3079
3080         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
3081                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
3082                                              the_acl_type, the_acl) == -1) {
3083                         /*
3084                          * Some systems allow all the above calls and only fail with no ACL support
3085                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3086                          */
3087                         if (no_acl_syscall_error(errno)) {
3088                                 *pacl_set_support = False;
3089                         }
3090
3091                         if (acl_group_override(conn, fsp->fsp_name)) {
3092                                 int sret;
3093
3094                                 DEBUG(5,("set_canon_ace_list: acl group "
3095                                          "control on and current user in file "
3096                                          "%s primary group.\n",
3097                                          fsp_str_dbg(fsp)));
3098
3099                                 become_root();
3100                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
3101                                     fsp->fsp_name->base_name, the_acl_type,
3102                                     the_acl);
3103                                 unbecome_root();
3104                                 if (sret == 0) {
3105                                         ret = True;
3106                                 }
3107                         }
3108
3109                         if (ret == False) {
3110                                 DEBUG(2,("set_canon_ace_list: "
3111                                          "sys_acl_set_file type %s failed for "
3112                                          "file %s (%s).\n",
3113                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
3114                                          "directory default" : "file",
3115                                          fsp_str_dbg(fsp), strerror(errno)));
3116                                 goto fail;
3117                         }
3118                 }
3119         } else {
3120                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
3121                         /*
3122                          * Some systems allow all the above calls and only fail with no ACL support
3123                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3124                          */
3125                         if (no_acl_syscall_error(errno)) {
3126                                 *pacl_set_support = False;
3127                         }
3128
3129                         if (acl_group_override(conn, fsp->fsp_name)) {
3130                                 int sret;
3131
3132                                 DEBUG(5,("set_canon_ace_list: acl group "
3133                                          "control on and current user in file "
3134                                          "%s primary group.\n",
3135                                          fsp_str_dbg(fsp)));
3136
3137                                 become_root();
3138                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
3139                                 unbecome_root();
3140                                 if (sret == 0) {
3141                                         ret = True;
3142                                 }
3143                         }
3144
3145                         if (ret == False) {
3146                                 DEBUG(2,("set_canon_ace_list: "
3147                                          "sys_acl_set_file failed for file %s "
3148                                          "(%s).\n",
3149                                          fsp_str_dbg(fsp), strerror(errno)));
3150                                 goto fail;
3151                         }
3152                 }
3153         }
3154
3155         ret = True;
3156
3157   fail:
3158
3159         if (the_acl != NULL) {
3160                 TALLOC_FREE(the_acl);
3161         }
3162
3163         return ret;
3164 }
3165
3166 /****************************************************************************
3167  Find a particular canon_ace entry.
3168 ****************************************************************************/
3169
3170 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, struct unixid *id)
3171 {
3172         while (list) {
3173                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
3174                                 (type == SMB_ACL_USER  && id && id->id == list->unix_ug.id) ||
3175                                 (type == SMB_ACL_GROUP && id && id->id == list->unix_ug.id)))
3176                         break;
3177                 list = list->next;
3178         }
3179         return list;
3180 }
3181
3182 /****************************************************************************
3183
3184 ****************************************************************************/
3185
3186 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
3187 {
3188         SMB_ACL_ENTRY_T entry;
3189
3190         if (!the_acl)
3191                 return NULL;
3192         if (sys_acl_get_entry(the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
3193                 TALLOC_FREE(the_acl);
3194                 return NULL;
3195         }
3196         return the_acl;
3197 }
3198
3199 /****************************************************************************
3200  Convert a canon_ace to a generic 3 element permission - if possible.
3201 ****************************************************************************/
3202
3203 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3204
3205 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3206 {
3207         int snum = SNUM(fsp->conn);
3208         size_t ace_count = count_canon_ace_list(file_ace_list);
3209         canon_ace *ace_p;
3210         canon_ace *owner_ace = NULL;
3211         canon_ace *group_ace = NULL;
3212         canon_ace *other_ace = NULL;
3213         mode_t and_bits;
3214         mode_t or_bits;
3215
3216         if (ace_count != 3) {
3217                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3218                          "entries for file %s to convert to posix perms.\n",
3219                          fsp_str_dbg(fsp)));
3220                 return False;
3221         }
3222
3223         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3224                 if (ace_p->owner_type == UID_ACE)
3225                         owner_ace = ace_p;
3226                 else if (ace_p->owner_type == GID_ACE)
3227                         group_ace = ace_p;
3228                 else if (ace_p->owner_type == WORLD_ACE)
3229                         other_ace = ace_p;
3230         }
3231
3232         if (!owner_ace || !group_ace || !other_ace) {
3233                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3234                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3235                 return False;
3236         }
3237
3238         *posix_perms = (mode_t)0;
3239
3240         *posix_perms |= owner_ace->perms;
3241         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3242         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3243         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3244         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3245         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3246         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3247
3248         /* The owner must have at least read access. */
3249
3250         *posix_perms |= S_IRUSR;
3251         if (fsp->is_directory)
3252                 *posix_perms |= (S_IWUSR|S_IXUSR);
3253
3254         /* If requested apply the masks. */
3255
3256         /* Get the initial bits to apply. */
3257
3258         if (fsp->is_directory) {
3259                 and_bits = lp_dir_mask(snum);
3260                 or_bits = lp_force_dir_mode(snum);
3261         } else {
3262                 and_bits = lp_create_mask(snum);
3263                 or_bits = lp_force_create_mode(snum);
3264         }
3265
3266         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3267
3268         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3269                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3270                   (int)group_ace->perms, (int)other_ace->perms,
3271                   (int)*posix_perms, fsp_str_dbg(fsp)));
3272
3273         return True;
3274 }
3275
3276 /****************************************************************************
3277   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3278   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3279   with CI|OI set so it is inherited and also applies to the directory.
3280   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3281 ****************************************************************************/
3282
3283 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3284 {
3285         size_t i, j;
3286
3287         for (i = 0; i < num_aces; i++) {
3288                 for (j = i+1; j < num_aces; j++) {
3289                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3290                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3291                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3292                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3293
3294                         /* We know the lower number ACE's are file entries. */
3295                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3296                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3297                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3298                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3299                                 (i_inh == j_inh) &&
3300                                 (i_flags_ni == 0) &&
3301                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3302                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3303                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3304                                 /*
3305                                  * W2K wants to have access allowed zero access ACE's
3306                                  * at the end of the list. If the mask is zero, merge
3307                                  * the non-inherited ACE onto the inherited ACE.
3308                                  */
3309
3310                                 if (nt_ace_list[i].access_mask == 0) {
3311                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3312                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3313                                         if (num_aces - i - 1 > 0)
3314                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3315                                                                 sizeof(struct security_ace));
3316
3317                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3318                                                 (unsigned int)i, (unsigned int)j ));
3319                                 } else {
3320                                         /*
3321                                          * These are identical except for the flags.
3322                                          * Merge the inherited ACE onto the non-inherited ACE.
3323                                          */
3324
3325                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3326                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3327                                         if (num_aces - j - 1 > 0)
3328                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3329                                                                 sizeof(struct security_ace));
3330
3331                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3332                                                 (unsigned int)j, (unsigned int)i ));
3333                                 }
3334                                 num_aces--;
3335                                 break;
3336                         }
3337                 }
3338         }
3339
3340         return num_aces;
3341 }
3342
3343 /*
3344  * Add or Replace ACE entry.
3345  * In some cases we need to add a specific ACE for compatibility reasons.
3346  * When doing that we must make sure we are not actually creating a duplicate
3347  * entry. So we need to search whether an ACE entry already exist and eventually
3348  * replacce the access mask, or add a completely new entry if none was found.
3349  *
3350  * This function assumes the array has enough space to add a new entry without
3351  * any reallocation of memory.
3352  */
3353
3354 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3355                                 const struct dom_sid *sid, enum security_ace_type type,
3356                                 uint32_t mask, uint8_t flags)
3357 {
3358         int i;
3359
3360         /* first search for a duplicate */
3361         for (i = 0; i < *num_aces; i++) {
3362                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3363                     (nt_ace_list[i].flags == flags)) break;
3364         }
3365
3366         if (i < *num_aces) { /* found */
3367                 nt_ace_list[i].type = type;
3368                 nt_ace_list[i].access_mask = mask;
3369                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3370                            i, sid_string_dbg(sid), flags));
3371                 return;
3372         }
3373
3374         /* not found, append it */
3375         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3376 }
3377
3378
3379 /****************************************************************************
3380  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3381  the space for the return elements and returns the size needed to return the
3382  security descriptor. This should be the only external function needed for
3383  the UNIX style get ACL.
3384 ****************************************************************************/
3385
3386 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3387                                       const char *name,
3388                                       const SMB_STRUCT_STAT *sbuf,
3389                                       struct pai_val *pal,
3390                                       SMB_ACL_T posix_acl,
3391                                       SMB_ACL_T def_acl,
3392                                       uint32_t security_info,
3393                                       TALLOC_CTX *mem_ctx,
3394                                       struct security_descriptor **ppdesc)
3395 {
3396         struct dom_sid owner_sid;
3397         struct dom_sid group_sid;
3398         size_t sd_size = 0;
3399         struct security_acl *psa = NULL;
3400         size_t num_acls = 0;
3401         size_t num_def_acls = 0;
3402         size_t num_aces = 0;
3403         canon_ace *file_ace = NULL;
3404         canon_ace *dir_ace = NULL;
3405         struct security_ace *nt_ace_list = NULL;
3406         size_t num_profile_acls = 0;
3407         struct dom_sid orig_owner_sid;
3408         struct security_descriptor *psd = NULL;
3409         int i;
3410
3411         /*
3412          * Get the owner, group and world SIDs.
3413          */
3414
3415         create_file_sids(sbuf, &owner_sid, &group_sid);
3416
3417         if (lp_profile_acls(SNUM(conn))) {
3418                 /* For WXP SP1 the owner must be administrators. */
3419                 sid_copy(&orig_owner_sid, &owner_sid);
3420                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3421                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3422                 num_profile_acls = 3;
3423         }
3424
3425         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3426
3427                 /*
3428                  * In the optimum case Creator Owner and Creator Group would be used for
3429                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3430                  * would lead to usability problems under Windows: The Creator entries
3431                  * are only available in browse lists of directories and not for files;
3432                  * additionally the identity of the owning group couldn't be determined.
3433                  * We therefore use those identities only for Default ACLs.
3434                  */
3435
3436                 /* Create the canon_ace lists. */
3437                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3438                                             &owner_sid, &group_sid, pal,
3439                                             SMB_ACL_TYPE_ACCESS);
3440
3441                 /* We must have *some* ACLS. */
3442
3443                 if (count_canon_ace_list(file_ace) == 0) {
3444                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3445                         goto done;
3446                 }
3447
3448                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3449                         dir_ace = canonicalise_acl(conn, name, def_acl,
3450                                                    sbuf,
3451                                                    &global_sid_Creator_Owner,
3452                                                    &global_sid_Creator_Group,
3453                                                    pal, SMB_ACL_TYPE_DEFAULT);
3454                 }
3455
3456                 /*
3457                  * Create the NT ACE list from the canonical ace lists.
3458                  */
3459
3460                 {
3461                         canon_ace *ace;
3462                         enum security_ace_type nt_acl_type;
3463
3464                         if (nt4_compatible_acls() && dir_ace) {
3465                                 /*
3466                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3467                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3468                                  * remove entries from the Access ACL if the
3469                                  * corresponding Default ACL entries have also been
3470                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3471                                  * are exceptions. We can do nothing
3472                                  * intelligent if the Default ACL contains entries that
3473                                  * are not also contained in the Access ACL, so this
3474                                  * case will still fail under NT 4.
3475                                  */
3476
3477                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3478                                 if (ace && !ace->perms) {
3479                                         DLIST_REMOVE(dir_ace, ace);
3480                                         TALLOC_FREE(ace);
3481
3482                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3483                                         if (ace && !ace->perms) {
3484                                                 DLIST_REMOVE(file_ace, ace);
3485                                                 TALLOC_FREE(ace);
3486                                         }
3487                                 }
3488
3489                                 /*
3490                                  * WinNT doesn't usually have Creator Group
3491                                  * in browse lists, so we send this entry to
3492                                  * WinNT even if it contains no relevant
3493                                  * permissions. Once we can add
3494                                  * Creator Group to browse lists we can
3495                                  * re-enable this.
3496                                  */
3497
3498 #if 0
3499                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3500                                 if (ace && !ace->perms) {
3501                                         DLIST_REMOVE(dir_ace, ace);
3502                                         TALLOC_FREE(ace);
3503                                 }
3504 #endif
3505
3506                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3507                                 if (ace && !ace->perms) {
3508                                         DLIST_REMOVE(file_ace, ace);
3509                                         TALLOC_FREE(ace);
3510                                 }
3511                         }
3512
3513                         num_acls = count_canon_ace_list(file_ace);
3514                         num_def_acls = count_canon_ace_list(dir_ace);
3515
3516                         /* Allocate the ace list. */
3517                         if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3518                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3519                                 goto done;
3520                         }
3521
3522                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3523
3524                         /*
3525                          * Create the NT ACE list from the canonical ace lists.
3526                          */
3527
3528                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3529                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3530                                                 &nt_acl_type,
3531                                                 ace->perms,
3532                                                 S_ISDIR(sbuf->st_ex_mode));
3533                                 init_sec_ace(&nt_ace_list[num_aces++],
3534                                         &ace->trustee,
3535                                         nt_acl_type,
3536                                         acc,
3537                                         ace->ace_flags);
3538                         }
3539
3540                         /* The User must have access to a profile share - even
3541                          * if we can't map the SID. */
3542                         if (lp_profile_acls(SNUM(conn))) {
3543                                 add_or_replace_ace(nt_ace_list, &num_aces,
3544                                                    &global_sid_Builtin_Users,
3545                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3546                                                    FILE_GENERIC_ALL, 0);
3547                         }
3548
3549                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3550                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3551                                                 &nt_acl_type,
3552                                                 ace->perms,
3553                                                 S_ISDIR(sbuf->st_ex_mode));
3554                                 init_sec_ace(&nt_ace_list[num_aces++],
3555                                         &ace->trustee,
3556                                         nt_acl_type,
3557                                         acc,
3558                                         ace->ace_flags |
3559                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3560                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3561                                         SEC_ACE_FLAG_INHERIT_ONLY);
3562                         }
3563
3564                         /* The User must have access to a profile share - even
3565                          * if we can't map the SID. */
3566                         if (lp_profile_acls(SNUM(conn))) {
3567                                 add_or_replace_ace(nt_ace_list, &num_aces,
3568                                                 &global_sid_Builtin_Users,
3569                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3570                                                 FILE_GENERIC_ALL,
3571                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3572                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3573                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3574                         }
3575
3576                         /*
3577                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3578                          * Win2K needs this to get the inheritance correct when replacing ACLs
3579                          * on a directory tree. Based on work by Jim @ IBM.
3580                          */
3581
3582                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3583
3584                         if (lp_profile_acls(SNUM(conn))) {
3585                                 for (i = 0; i < num_aces; i++) {
3586                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3587                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3588                                                                    &orig_owner_sid,
3589                                                                    nt_ace_list[i].type,
3590                                                                    nt_ace_list[i].access_mask,
3591                                                                    nt_ace_list[i].flags);
3592                                                 break;
3593                                         }
3594                                 }
3595                         }
3596                 }
3597
3598                 if (num_aces) {
3599                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3600                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3601                                 goto done;
3602                         }
3603                 }
3604         } /* security_info & SECINFO_DACL */
3605
3606         psd = make_standard_sec_desc(mem_ctx,
3607                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3608                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3609                         psa,
3610                         &sd_size);
3611
3612         if(!psd) {
3613                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3614                 sd_size = 0;
3615                 goto done;
3616         }
3617
3618         /*
3619          * Windows 2000: The DACL_PROTECTED flag in the security
3620          * descriptor marks the ACL as non-inheriting, i.e., no
3621          * ACEs from higher level directories propagate to this
3622          * ACL. In the POSIX ACL model permissions are only
3623          * inherited at file create time, so ACLs never contain
3624          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3625          * flag doesn't seem to bother Windows NT.
3626          * Always set this if map acl inherit is turned off.
3627          */
3628         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3629                 psd->type |= SEC_DESC_DACL_PROTECTED;
3630         } else {
3631                 psd->type |= pal->sd_type;
3632         }
3633
3634         if (psd->dacl) {
3635                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3636         }
3637
3638         *ppdesc = psd;
3639
3640  done:
3641
3642         if (posix_acl) {
3643                 TALLOC_FREE(posix_acl);
3644         }
3645         if (def_acl) {
3646                 TALLOC_FREE(def_acl);
3647         }
3648         free_canon_ace_list(file_ace);
3649         free_canon_ace_list(dir_ace);
3650         free_inherited_info(pal);
3651         TALLOC_FREE(nt_ace_list);
3652
3653         return NT_STATUS_OK;
3654 }
3655
3656 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3657                            TALLOC_CTX *mem_ctx,
3658                            struct security_descriptor **ppdesc)
3659 {
3660         SMB_STRUCT_STAT sbuf;
3661         SMB_ACL_T posix_acl = NULL;
3662         struct pai_val *pal;
3663         TALLOC_CTX *frame = talloc_stackframe();
3664         NTSTATUS status;
3665
3666         *ppdesc = NULL;
3667
3668         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3669                   fsp_str_dbg(fsp)));
3670
3671         /* can it happen that fsp_name == NULL ? */
3672         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3673                 status = posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3674                                           security_info, mem_ctx, ppdesc);
3675                 TALLOC_FREE(frame);
3676                 return status;
3677         }
3678
3679         /* Get the stat struct for the owner info. */
3680         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3681                 TALLOC_FREE(frame);
3682                 return map_nt_error_from_unix(errno);
3683         }
3684
3685         /* Get the ACL from the fd. */
3686         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, frame);
3687
3688         pal = fload_inherited_info(fsp);
3689
3690         status = posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3691                                          &sbuf, pal, posix_acl, NULL,
3692                                          security_info, mem_ctx, ppdesc);
3693         TALLOC_FREE(frame);
3694         return status;
3695 }
3696
3697 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3698                           uint32_t security_info,
3699                           TALLOC_CTX *mem_ctx,
3700                           struct security_descriptor **ppdesc)
3701 {
3702         SMB_ACL_T posix_acl = NULL;
3703         SMB_ACL_T def_acl = NULL;
3704         struct pai_val *pal;
3705         struct smb_filename smb_fname;
3706         int ret;
3707         TALLOC_CTX *frame = talloc_stackframe();
3708         NTSTATUS status;
3709
3710         *ppdesc = NULL;
3711
3712         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3713
3714         ZERO_STRUCT(smb_fname);
3715         smb_fname.base_name = discard_const_p(char, name);
3716
3717         /* Get the stat struct for the owner info. */
3718         if (lp_posix_pathnames()) {
3719                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3720         } else {
3721                 ret = SMB_VFS_STAT(conn, &smb_fname);
3722         }
3723
3724         if (ret == -1) {
3725                 TALLOC_FREE(frame);
3726                 return map_nt_error_from_unix(errno);
3727         }
3728
3729         /* Get the ACL from the path. */
3730         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name,
3731                                              SMB_ACL_TYPE_ACCESS, frame);
3732
3733         /* If it's a directory get the default POSIX ACL. */
3734         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3735                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name,
3736                                                    SMB_ACL_TYPE_DEFAULT, frame);
3737                 def_acl = free_empty_sys_acl(conn, def_acl);
3738         }
3739
3740         pal = load_inherited_info(conn, name);
3741
3742         status = posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3743                                          posix_acl, def_acl, security_info,
3744                                          mem_ctx,
3745                                          ppdesc);
3746         TALLOC_FREE(frame);
3747         return status;
3748 }
3749
3750 /****************************************************************************
3751  Try to chown a file. We will be able to chown it under the following conditions.
3752
3753   1) If we have root privileges, then it will just work.
3754   2) If we have SeRestorePrivilege we can change the user + group to any other user.
3755   3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3756   4) If we have write permission to the file and dos_filemodes is set
3757      then allow chown to the currently authenticated user.
3758 ****************************************************************************/
3759
3760 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3761 {
3762         NTSTATUS status;
3763
3764         if(!CAN_WRITE(fsp->conn)) {
3765                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3766         }
3767
3768         /* Case (1). */
3769         status = vfs_chown_fsp(fsp, uid, gid);
3770         if (NT_STATUS_IS_OK(status)) {
3771                 return status;
3772         }
3773
3774         /* Case (2) / (3) */
3775         if (lp_enable_privileges()) {
3776                 bool has_take_ownership_priv = security_token_has_privilege(
3777                                                 get_current_nttok(fsp->conn),
3778                                                 SEC_PRIV_TAKE_OWNERSHIP);
3779                 bool has_restore_priv = security_token_has_privilege(
3780                                                 get_current_nttok(fsp->conn),
3781                                                 SEC_PRIV_RESTORE);
3782
3783                 if (has_restore_priv) {
3784                         ; /* Case (2) */
3785                 } else if (has_take_ownership_priv) {
3786                         /* Case (3) */
3787                         if (uid == get_current_uid(fsp->conn)) {
3788                                 gid = (gid_t)-1;
3789                         } else {
3790                                 has_take_ownership_priv = false;
3791                         }
3792                 }
3793
3794                 if (has_take_ownership_priv || has_restore_priv) {
3795                         become_root();
3796                         status = vfs_chown_fsp(fsp, uid, gid);
3797                         unbecome_root();
3798                         return status;
3799                 }
3800         }
3801
3802         /* Case (4). */
3803         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3804                 return NT_STATUS_ACCESS_DENIED;
3805         }
3806
3807         /* only allow chown to the current user. This is more secure,
3808            and also copes with the case where the SID in a take ownership ACL is
3809            a local SID on the users workstation
3810         */
3811         if (uid != get_current_uid(fsp->conn)) {
3812                 return NT_STATUS_ACCESS_DENIED;
3813         }
3814
3815         become_root();
3816         /* Keep the current file gid the same. */
3817         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3818         unbecome_root();
3819
3820         return status;
3821 }
3822
3823 #if 0
3824 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3825
3826 /****************************************************************************
3827  Take care of parent ACL inheritance.
3828 ****************************************************************************/
3829
3830 NTSTATUS append_parent_acl(files_struct *fsp,
3831                                 const struct security_descriptor *pcsd,
3832                                 struct security_descriptor **pp_new_sd)
3833 {
3834         struct smb_filename *smb_dname = NULL;
3835         struct security_descriptor *parent_sd = NULL;
3836         files_struct *parent_fsp = NULL;
3837         TALLOC_CTX *mem_ctx = talloc_tos();
3838         char *parent_name = NULL;
3839         struct security_ace *new_ace = NULL;
3840         unsigned int num_aces = pcsd->dacl->num_aces;
3841         NTSTATUS status;
3842         int info;
3843         unsigned int i, j;
3844         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3845         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3846
3847         if (psd == NULL) {
3848                 return NT_STATUS_NO_MEMORY;
3849         }
3850
3851         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3852                             NULL)) {
3853                 return NT_STATUS_NO_MEMORY;
3854         }
3855
3856         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3857                                             &smb_dname);
3858         if (!NT_STATUS_IS_OK(status)) {
3859                 goto fail;
3860         }
3861
3862         status = SMB_VFS_CREATE_FILE(
3863                 fsp->conn,                              /* conn */
3864                 NULL,                                   /* req */
3865                 0,                                      /* root_dir_fid */
3866                 smb_dname,                              /* fname */
3867                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3868                 FILE_SHARE_NONE,                        /* share_access */
3869                 FILE_OPEN,                              /* create_disposition*/
3870                 FILE_DIRECTORY_FILE,                    /* create_options */
3871                 0,                                      /* file_attributes */
3872                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3873                 0,                                      /* allocation_size */
3874                 NULL,                                   /* sd */
3875                 NULL,                                   /* ea_list */
3876                 &parent_fsp,                            /* result */
3877                 &info);                                 /* pinfo */
3878
3879         if (!NT_STATUS_IS_OK(status)) {
3880                 TALLOC_FREE(smb_dname);
3881                 return status;
3882         }
3883
3884         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3885                                     SECINFO_DACL, &parent_sd );
3886
3887         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3888         TALLOC_FREE(smb_dname);
3889
3890         if (!NT_STATUS_IS_OK(status)) {
3891                 return status;
3892         }
3893
3894         /*
3895          * Make room for potentially all the ACLs from
3896          * the parent. We used to add the ugw triple here,
3897          * as we knew we were dealing with POSIX ACLs.
3898          * We no longer need to do so as we can guarentee
3899          * that a default ACL from the parent directory will
3900          * be well formed for POSIX ACLs if it came from a
3901          * POSIX ACL source, and if we're not writing to a
3902          * POSIX ACL sink then we don't care if it's not well
3903          * formed. JRA.
3904          */
3905
3906         num_aces += parent_sd->dacl->num_aces;
3907
3908         if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3909                                         num_aces)) == NULL) {
3910                 return NT_STATUS_NO_MEMORY;
3911         }
3912
3913         /* Start by copying in all the given ACE entries. */
3914         for (i = 0; i < psd->dacl->num_aces; i++) {
3915                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3916         }
3917
3918         /*
3919          * Note that we're ignoring "inherit permissions" here
3920          * as that really only applies to newly created files. JRA.
3921          */
3922
3923         /* Finally append any inherited ACEs. */
3924         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3925                 struct security_ace *se = &parent_sd->dacl->aces[j];
3926
3927                 if (fsp->is_directory) {
3928                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3929                                 /* Doesn't apply to a directory - ignore. */
3930                                 DEBUG(10,("append_parent_acl: directory %s "
3931                                         "ignoring non container "
3932                                         "inherit flags %u on ACE with sid %s "
3933                                         "from parent %s\n",
3934                                         fsp_str_dbg(fsp),
3935                                         (unsigned int)se->flags,
3936                                         sid_string_dbg(&se->trustee),
3937                                         parent_name));
3938                                 continue;
3939                         }
3940                 } else {
3941                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3942                                 /* Doesn't apply to a file - ignore. */
3943                                 DEBUG(10,("append_parent_acl: file %s "
3944                                         "ignoring non object "
3945                                         "inherit flags %u on ACE with sid %s "
3946                                         "from parent %s\n",
3947                                         fsp_str_dbg(fsp),
3948                                         (unsigned int)se->flags,
3949                                         sid_string_dbg(&se->trustee),
3950                                         parent_name));
3951                                 continue;
3952                         }
3953                 }
3954
3955                 if (is_dacl_protected) {
3956                         /* If the DACL is protected it means we must
3957                          * not overwrite an existing ACE entry with the
3958                          * same SID. This is order N^2. Ouch :-(. JRA. */
3959                         unsigned int k;
3960                         for (k = 0; k < psd->dacl->num_aces; k++) {
3961                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3962                                                 &se->trustee)) {
3963                                         break;
3964                                 }
3965                         }
3966                         if (k < psd->dacl->num_aces) {
3967                                 /* SID matched. Ignore. */
3968                                 DEBUG(10,("append_parent_acl: path %s "
3969                                         "ignoring ACE with protected sid %s "
3970                                         "from parent %s\n",
3971                                         fsp_str_dbg(fsp),
3972                                         sid_string_dbg(&se->trustee),
3973                                         parent_name));
3974                                 continue;
3975                         }
3976                 }
3977
3978                 sec_ace_copy(&new_ace[i], se);
3979                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3980                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3981                 }
3982                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3983
3984                 if (fsp->is_directory) {
3985                         /*
3986                          * Strip off any inherit only. It's applied.
3987                          */
3988                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3989                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3990                                 /* No further inheritance. */
3991                                 new_ace[i].flags &=
3992                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3993                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3994                         }
3995                 } else {
3996                         /*
3997                          * Strip off any container or inherit
3998                          * flags, they can't apply to objects.
3999                          */
4000                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
4001                                                 SEC_ACE_FLAG_INHERIT_ONLY|
4002                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
4003                 }
4004                 i++;
4005
4006                 DEBUG(10,("append_parent_acl: path %s "
4007                         "inheriting ACE with sid %s "
4008                         "from parent %s\n",
4009                         fsp_str_dbg(fsp),
4010                         sid_string_dbg(&se->trustee),
4011                         parent_name));
4012         }
4013
4014         psd->dacl->aces = new_ace;
4015         psd->dacl->num_aces = i;
4016         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
4017                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
4018
4019         *pp_new_sd = psd;
4020         return status;
4021 }
4022 #endif
4023
4024 /****************************************************************************
4025  Reply to set a security descriptor on an fsp. security_info_sent is the
4026  description of the following NT ACL.
4027  This should be the only external function needed for the UNIX style set ACL.
4028  We make a copy of psd_orig as internal functions modify the elements inside
4029  it, even though it's a const pointer.
4030 ****************************************************************************/
4031
4032 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
4033 {
4034         connection_struct *conn = fsp->conn;
4035         uid_t user = (uid_t)-1;
4036         gid_t grp = (gid_t)-1;
4037         struct dom_sid file_owner_sid;
4038         struct dom_sid file_grp_sid;
4039         canon_ace *file_ace_list = NULL;
4040         canon_ace *dir_ace_list = NULL;
4041         bool acl_perms = False;
4042         mode_t orig_mode = (mode_t)0;
4043         NTSTATUS status;
4044         bool set_acl_as_root = false;
4045         bool acl_set_support = false;
4046         bool ret = false;
4047         struct security_descriptor *psd = NULL;
4048
4049         DEBUG(10,("set_nt_acl: called for file %s\n",
4050                   fsp_str_dbg(fsp)));
4051
4052         if (!CAN_WRITE(conn)) {
4053                 DEBUG(10,("set acl rejected on read-only share\n"));
4054                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
4055         }
4056
4057         if (!psd_orig) {
4058                 return NT_STATUS_INVALID_PARAMETER;
4059         }
4060
4061         psd = dup_sec_desc(talloc_tos(), psd_orig);
4062         if (!psd) {
4063                 return NT_STATUS_NO_MEMORY;
4064         }
4065
4066         /*
4067          * Get the current state of the file.
4068          */
4069
4070         status = vfs_stat_fsp(fsp);
4071         if (!NT_STATUS_IS_OK(status)) {
4072                 return status;
4073         }
4074
4075         /* Save the original element we check against. */
4076         orig_mode = fsp->fsp_name->st.st_ex_mode;
4077
4078         /*
4079          * Unpack the user/group/world id's.
4080          */
4081
4082         /* POSIX can't cope with missing owner/group. */
4083         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
4084                 security_info_sent &= ~SECINFO_OWNER;
4085         }
4086         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
4087                 security_info_sent &= ~SECINFO_GROUP;
4088         }
4089
4090         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
4091         if (!NT_STATUS_IS_OK(status)) {
4092                 return status;
4093         }
4094
4095         /*
4096          * Do we need to chown ? If so this must be done first as the incoming
4097          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
4098          * Noticed by Simo.
4099          */
4100
4101         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
4102             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
4103
4104                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
4105                          fsp_str_dbg(fsp), (unsigned int)user,
4106                          (unsigned int)grp));
4107
4108                 status = try_chown(fsp, user, grp);
4109                 if(!NT_STATUS_IS_OK(status)) {
4110                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
4111                                 "= %s.\n", fsp_str_dbg(fsp),
4112                                 (unsigned int)user,
4113                                 (unsigned int)grp,
4114                                 nt_errstr(status)));
4115                         return status;
4116                 }
4117
4118                 /*
4119                  * Recheck the current state of the file, which may have changed.
4120                  * (suid/sgid bits, for instance)
4121                  */
4122
4123                 status = vfs_stat_fsp(fsp);
4124                 if (!NT_STATUS_IS_OK(status)) {
4125                         return status;
4126                 }
4127
4128                 /* Save the original element we check against. */
4129                 orig_mode = fsp->fsp_name->st.st_ex_mode;
4130
4131                 /* If we successfully chowned, we know we must
4132                  * be able to set the acl, so do it as root.
4133                  */
4134                 set_acl_as_root = true;
4135         }
4136
4137         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
4138
4139         if((security_info_sent & SECINFO_DACL) &&
4140                         (psd->type & SEC_DESC_DACL_PRESENT) &&
4141                         (psd->dacl == NULL)) {
4142                 struct security_ace ace[3];
4143
4144                 /* We can't have NULL DACL in POSIX.
4145                    Use owner/group/Everyone -> full access. */
4146
4147                 init_sec_ace(&ace[0],
4148                                 &file_owner_sid,
4149                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4150                                 GENERIC_ALL_ACCESS,
4151                                 0);
4152                 init_sec_ace(&ace[1],
4153                                 &file_grp_sid,
4154                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4155                                 GENERIC_ALL_ACCESS,
4156                                 0);
4157                 init_sec_ace(&ace[2],
4158                                 &global_sid_World,
4159                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4160                                 GENERIC_ALL_ACCESS,
4161                                 0);
4162                 psd->dacl = make_sec_acl(talloc_tos(),
4163                                         NT4_ACL_REVISION,
4164                                         3,
4165                                         ace);
4166                 if (psd->dacl == NULL) {
4167                         return NT_STATUS_NO_MEMORY;
4168                 }
4169                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
4170         }
4171
4172         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
4173                                      &file_grp_sid, &file_ace_list,
4174                                      &dir_ace_list, security_info_sent, psd);
4175
4176         /* Ignore W2K traverse DACL set. */
4177         if (!file_ace_list && !dir_ace_list) {
4178                 return NT_STATUS_OK;
4179         }
4180
4181         if (!acl_perms) {
4182                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
4183                 free_canon_ace_list(file_ace_list);
4184                 free_canon_ace_list(dir_ace_list);
4185                 return NT_STATUS_ACCESS_DENIED;
4186         }
4187
4188         /*
4189          * Only change security if we got a DACL.
4190          */
4191
4192         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
4193                 free_canon_ace_list(file_ace_list);
4194                 free_canon_ace_list(dir_ace_list);
4195                 return NT_STATUS_OK;
4196         }
4197
4198         /*
4199          * Try using the POSIX ACL set first. Fall back to chmod if
4200          * we have no ACL support on this filesystem.
4201          */
4202
4203         if (acl_perms && file_ace_list) {
4204                 if (set_acl_as_root) {
4205                         become_root();
4206                 }
4207                 ret = set_canon_ace_list(fsp, file_ace_list, false,
4208                                          &fsp->fsp_name->st, &acl_set_support);
4209                 if (set_acl_as_root) {
4210                         unbecome_root();
4211                 }
4212                 if (acl_set_support && ret == false) {
4213                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
4214                                  "%s (%s).\n", fsp_str_dbg(fsp),
4215                                  strerror(errno)));
4216                         free_canon_ace_list(file_ace_list);
4217                         free_canon_ace_list(dir_ace_list);
4218                         return map_nt_error_from_unix(errno);
4219                 }
4220         }
4221
4222         if (acl_perms && acl_set_support && fsp->is_directory) {
4223                 if (dir_ace_list) {
4224                         if (set_acl_as_root) {
4225                                 become_root();
4226                         }
4227                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
4228                                                  &fsp->fsp_name->st,
4229                                                  &acl_set_support);
4230                         if (set_acl_as_root) {
4231                                 unbecome_root();
4232                         }
4233                         if (ret == false) {
4234                                 DEBUG(3,("set_nt_acl: failed to set default "
4235                                          "acl on directory %s (%s).\n",
4236                                          fsp_str_dbg(fsp), strerror(errno)));
4237                                 free_canon_ace_list(file_ace_list);
4238                                 free_canon_ace_list(dir_ace_list);
4239                                 return map_nt_error_from_unix(errno);
4240                         }
4241                 } else {
4242                         int sret = -1;
4243
4244                         /*
4245                          * No default ACL - delete one if it exists.
4246                          */
4247
4248                         if (set_acl_as_root) {
4249                                 become_root();
4250                         }
4251                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4252                             fsp->fsp_name->base_name);
4253                         if (set_acl_as_root) {
4254                                 unbecome_root();
4255                         }
4256                         if (sret == -1) {
4257                                 if (acl_group_override(conn, fsp->fsp_name)) {
4258                                         DEBUG(5,("set_nt_acl: acl group "
4259                                                  "control on and current user "
4260                                                  "in file %s primary group. "
4261                                                  "Override delete_def_acl\n",
4262                                                  fsp_str_dbg(fsp)));
4263
4264                                         become_root();
4265                                         sret =
4266                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4267                                                     conn,
4268                                                     fsp->fsp_name->base_name);
4269                                         unbecome_root();
4270                                 }
4271
4272                                 if (sret == -1) {
4273                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4274                                         free_canon_ace_list(file_ace_list);
4275                                         free_canon_ace_list(dir_ace_list);
4276                                         return map_nt_error_from_unix(errno);
4277                                 }
4278                         }
4279                 }
4280         }
4281
4282         if (acl_set_support) {
4283                 if (set_acl_as_root) {
4284                         become_root();
4285                 }
4286                 store_inheritance_attributes(fsp,
4287                                 file_ace_list,
4288                                 dir_ace_list,
4289                                 psd->type);
4290                 if (set_acl_as_root) {
4291                         unbecome_root();
4292                 }
4293         }
4294
4295         /*
4296          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4297          */
4298
4299         if(!acl_set_support && acl_perms) {
4300                 mode_t posix_perms;
4301
4302                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4303                         free_canon_ace_list(file_ace_list);
4304                         free_canon_ace_list(dir_ace_list);
4305                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4306                                  "posix permissions for file %s.\n",
4307                                  fsp_str_dbg(fsp)));
4308                         return NT_STATUS_ACCESS_DENIED;
4309                 }
4310
4311                 if (orig_mode != posix_perms) {
4312                         int sret = -1;
4313
4314                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4315                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4316
4317                         if (set_acl_as_root) {
4318                                 become_root();
4319                         }
4320                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4321                                              posix_perms);
4322                         if (set_acl_as_root) {
4323                                 unbecome_root();
4324                         }
4325                         if(sret == -1) {
4326                                 if (acl_group_override(conn, fsp->fsp_name)) {
4327                                         DEBUG(5,("set_nt_acl: acl group "
4328                                                  "control on and current user "
4329                                                  "in file %s primary group. "
4330                                                  "Override chmod\n",
4331                                                  fsp_str_dbg(fsp)));
4332
4333                                         become_root();
4334                                         sret = SMB_VFS_CHMOD(conn,
4335                                             fsp->fsp_name->base_name,
4336                                             posix_perms);
4337                                         unbecome_root();
4338                                 }
4339
4340                                 if (sret == -1) {
4341                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4342                                                  "failed. Error = %s.\n",
4343                                                  fsp_str_dbg(fsp),
4344                                                  (unsigned int)posix_perms,
4345                                                  strerror(errno)));
4346                                         free_canon_ace_list(file_ace_list);
4347                                         free_canon_ace_list(dir_ace_list);
4348                                         return map_nt_error_from_unix(errno);
4349                                 }
4350                         }
4351                 }
4352         }
4353
4354         free_canon_ace_list(file_ace_list);
4355         free_canon_ace_list(dir_ace_list);
4356
4357         /* Ensure the stat struct in the fsp is correct. */
4358         status = vfs_stat_fsp(fsp);
4359
4360         return NT_STATUS_OK;
4361 }
4362
4363 /****************************************************************************
4364  Get the actual group bits stored on a file with an ACL. Has no effect if
4365  the file has no ACL. Needed in dosmode code where the stat() will return
4366  the mask bits, not the real group bits, for a file with an ACL.
4367 ****************************************************************************/
4368
4369 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4370 {
4371         int entry_id = SMB_ACL_FIRST_ENTRY;
4372         SMB_ACL_ENTRY_T entry;
4373         SMB_ACL_T posix_acl;
4374         int result = -1;
4375
4376         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4377                                              SMB_ACL_TYPE_ACCESS, talloc_tos());
4378         if (posix_acl == (SMB_ACL_T)NULL)
4379                 return -1;
4380
4381         while (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4382                 SMB_ACL_TAG_T tagtype;
4383                 SMB_ACL_PERMSET_T permset;
4384
4385                 entry_id = SMB_ACL_NEXT_ENTRY;
4386
4387                 if (sys_acl_get_tag_type(entry, &tagtype) ==-1)
4388                         break;
4389
4390                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4391                         if (sys_acl_get_permset(entry, &permset) == -1) {
4392                                 break;
4393                         } else {
4394                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4395                                 *mode |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRGRP : 0);
4396                                 *mode |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4397                                 *mode |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4398                                 result = 0;
4399                                 break;
4400                         }
4401                 }
4402         }
4403         TALLOC_FREE(posix_acl);
4404         return result;
4405 }
4406
4407 /****************************************************************************
4408  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4409  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4410 ****************************************************************************/
4411
4412 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4413 {
4414         int entry_id = SMB_ACL_FIRST_ENTRY;
4415         SMB_ACL_ENTRY_T entry;
4416         int num_entries = 0;
4417
4418         while ( sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4419                 SMB_ACL_TAG_T tagtype;
4420                 SMB_ACL_PERMSET_T permset;
4421                 mode_t perms;
4422
4423                 entry_id = SMB_ACL_NEXT_ENTRY;
4424
4425                 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
4426                         return -1;
4427
4428                 if (sys_acl_get_permset(entry, &permset) == -1)
4429                         return -1;
4430
4431                 num_entries++;
4432
4433                 switch(tagtype) {
4434                         case SMB_ACL_USER_OBJ:
4435                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4436                                 break;
4437                         case SMB_ACL_GROUP_OBJ:
4438                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4439                                 break;
4440                         case SMB_ACL_MASK:
4441                                 /*
4442                                  * FIXME: The ACL_MASK entry permissions should really be set to
4443                                  * the union of the permissions of all ACL_USER,
4444                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4445                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4446                                  */
4447                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4448                                 break;
4449                         case SMB_ACL_OTHER:
4450                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4451                                 break;
4452                         default:
4453                                 continue;
4454                 }
4455
4456                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4457                         return -1;
4458
4459                 if (sys_acl_set_permset(entry, permset) == -1)
4460                         return -1;
4461         }
4462
4463         /*
4464          * If this is a simple 3 element ACL or no elements then it's a standard
4465          * UNIX permission set. Just use chmod...
4466          */
4467
4468         if ((num_entries == 3) || (num_entries == 0))
4469                 return -1;
4470
4471         return 0;
4472 }
4473
4474 /****************************************************************************
4475  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4476  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4477  resulting ACL on TO.  Note that name is in UNIX character set.
4478 ****************************************************************************/
4479
4480 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4481 {
4482         SMB_ACL_T posix_acl = NULL;
4483         int ret = -1;
4484
4485         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from,
4486                                                   SMB_ACL_TYPE_ACCESS,
4487                                                   talloc_tos())) == NULL)
4488                 return -1;
4489
4490         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4491                 goto done;
4492
4493         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4494
4495  done:
4496
4497         TALLOC_FREE(posix_acl);
4498         return ret;
4499 }
4500
4501 /****************************************************************************
4502  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4503  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4504  Note that name is in UNIX character set.
4505 ****************************************************************************/
4506
4507 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4508 {
4509         return copy_access_posix_acl(conn, name, name, mode);
4510 }
4511
4512 /****************************************************************************
4513  Check for an existing default POSIX ACL on a directory.
4514 ****************************************************************************/
4515
4516 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4517 {
4518         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4519                                                      SMB_ACL_TYPE_DEFAULT,
4520                                                      talloc_tos());
4521         bool has_acl = False;
4522         SMB_ACL_ENTRY_T entry;
4523
4524         if (def_acl != NULL && (sys_acl_get_entry(def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4525                 has_acl = True;
4526         }
4527
4528         if (def_acl) {
4529                 TALLOC_FREE(def_acl);
4530         }
4531         return has_acl;
4532 }
4533
4534 /****************************************************************************
4535  If the parent directory has no default ACL but it does have an Access ACL,
4536  inherit this Access ACL to file name.
4537 ****************************************************************************/
4538
4539 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4540                        const char *name, mode_t mode)
4541 {
4542         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4543                 return 0;
4544
4545         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4546 }
4547
4548 /****************************************************************************
4549  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4550  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4551 ****************************************************************************/
4552
4553 int fchmod_acl(files_struct *fsp, mode_t mode)
4554 {
4555         connection_struct *conn = fsp->conn;
4556         SMB_ACL_T posix_acl = NULL;
4557         int ret = -1;
4558
4559         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos())) == NULL)
4560                 return -1;
4561
4562         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4563                 goto done;
4564
4565         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4566
4567   done:
4568
4569         TALLOC_FREE(posix_acl);
4570         return ret;
4571 }
4572
4573 /****************************************************************************
4574  Map from wire type to permset.
4575 ****************************************************************************/
4576
4577 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4578 {
4579         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4580                 return False;
4581         }
4582
4583         if (sys_acl_clear_perms(*p_permset) ==  -1) {
4584                 return False;
4585         }
4586
4587         if (wire_perm & SMB_POSIX_ACL_READ) {
4588                 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1) {
4589                         return False;
4590                 }
4591         }
4592         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4593                 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1) {
4594                         return False;
4595                 }
4596         }
4597         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4598                 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1) {
4599                         return False;
4600                 }
4601         }
4602         return True;
4603 }
4604
4605 /****************************************************************************
4606  Map from wire type to tagtype.
4607 ****************************************************************************/
4608
4609 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4610 {
4611         switch (wire_tt) {
4612                 case SMB_POSIX_ACL_USER_OBJ:
4613                         *p_tt = SMB_ACL_USER_OBJ;
4614                         break;
4615                 case SMB_POSIX_ACL_USER:
4616                         *p_tt = SMB_ACL_USER;
4617                         break;
4618                 case SMB_POSIX_ACL_GROUP_OBJ:
4619                         *p_tt = SMB_ACL_GROUP_OBJ;
4620                         break;
4621                 case SMB_POSIX_ACL_GROUP:
4622                         *p_tt = SMB_ACL_GROUP;
4623                         break;
4624                 case SMB_POSIX_ACL_MASK:
4625                         *p_tt = SMB_ACL_MASK;
4626                         break;
4627                 case SMB_POSIX_ACL_OTHER:
4628                         *p_tt = SMB_ACL_OTHER;
4629                         break;
4630                 default:
4631                         return False;
4632         }
4633         return True;
4634 }
4635
4636 /****************************************************************************
4637  Create a new POSIX acl from wire permissions.
4638  FIXME ! How does the share mask/mode fit into this.... ?
4639 ****************************************************************************/
4640
4641 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn,
4642                                             uint16 num_acls,
4643                                             const char *pdata,
4644                                             TALLOC_CTX *mem_ctx)
4645 {
4646         unsigned int i;
4647         SMB_ACL_T the_acl = sys_acl_init(mem_ctx);
4648
4649         if (the_acl == NULL) {
4650                 return NULL;
4651         }
4652
4653         for (i = 0; i < num_acls; i++) {
4654                 SMB_ACL_ENTRY_T the_entry;
4655                 SMB_ACL_PERMSET_T the_permset;
4656                 SMB_ACL_TAG_T tag_type;
4657
4658                 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
4659                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4660                                 i, strerror(errno) ));
4661                         goto fail;
4662                 }
4663
4664                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4665                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4666                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4667                         goto fail;
4668                 }
4669
4670                 if (sys_acl_set_tag_type(the_entry, tag_type) == -1) {
4671                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4672                                 i, strerror(errno) ));
4673                         goto fail;
4674                 }
4675
4676                 /* Get the permset pointer from the new ACL entry. */
4677                 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
4678                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4679                                 i, strerror(errno) ));
4680                         goto fail;
4681                 }
4682
4683                 /* Map from wire to permissions. */
4684                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4685                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4686                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4687                         goto fail;
4688                 }
4689
4690                 /* Now apply to the new ACL entry. */
4691                 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
4692                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4693                                 i, strerror(errno) ));
4694                         goto fail;
4695                 }
4696
4697                 if (tag_type == SMB_ACL_USER) {
4698                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4699                         uid_t uid = (uid_t)uidval;
4700                         if (sys_acl_set_qualifier(the_entry,(void *)&uid) == -1) {
4701                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4702                                         (unsigned int)uid, i, strerror(errno) ));
4703                                 goto fail;
4704                         }
4705                 }
4706
4707                 if (tag_type == SMB_ACL_GROUP) {
4708                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4709                         gid_t gid = (uid_t)gidval;
4710                         if (sys_acl_set_qualifier(the_entry,(void *)&gid) == -1) {
4711                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4712                                         (unsigned int)gid, i, strerror(errno) ));
4713                                 goto fail;
4714                         }
4715                 }
4716         }
4717
4718         return the_acl;
4719
4720  fail:
4721
4722         if (the_acl != NULL) {
4723                 TALLOC_FREE(the_acl);
4724         }
4725         return NULL;
4726 }
4727
4728 /****************************************************************************
4729  Calls from UNIX extensions - Default POSIX ACL set.
4730  If num_def_acls == 0 and not a directory just return. If it is a directory
4731  and num_def_acls == 0 then remove the default acl. Else set the default acl
4732  on the directory.
4733 ****************************************************************************/
4734
4735 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4736                                 uint16 num_def_acls, const char *pdata)
4737 {
4738         SMB_ACL_T def_acl = NULL;
4739
4740         if (!S_ISDIR(psbuf->st_ex_mode)) {
4741                 if (num_def_acls) {
4742                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4743                         errno = EISDIR;
4744                         return False;
4745                 } else {
4746                         return True;
4747                 }
4748         }
4749
4750         if (!num_def_acls) {
4751                 /* Remove the default ACL. */
4752                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4753                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4754                                 fname, strerror(errno) ));
4755                         return False;
4756                 }
4757                 return True;
4758         }
4759
4760         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls,
4761                                                   pdata,
4762                                                   talloc_tos())) == NULL) {
4763                 return False;
4764         }
4765
4766         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4767                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4768                         fname, strerror(errno) ));
4769                 TALLOC_FREE(def_acl);
4770                 return False;
4771         }
4772
4773         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4774         TALLOC_FREE(def_acl);
4775         return True;
4776 }
4777
4778 /****************************************************************************
4779  Remove an ACL from a file. As we don't have acl_delete_entry() available
4780  we must read the current acl and copy all entries except MASK, USER and GROUP
4781  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4782  removed.
4783  FIXME ! How does the share mask/mode fit into this.... ?
4784 ****************************************************************************/
4785
4786 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4787 {
4788         SMB_ACL_T file_acl = NULL;
4789         int entry_id = SMB_ACL_FIRST_ENTRY;
4790         SMB_ACL_ENTRY_T entry;
4791         bool ret = False;
4792         /* Create a new ACL with only 3 entries, u/g/w. */
4793         SMB_ACL_T new_file_acl = sys_acl_init(talloc_tos());
4794         SMB_ACL_ENTRY_T user_ent = NULL;
4795         SMB_ACL_ENTRY_T group_ent = NULL;
4796         SMB_ACL_ENTRY_T other_ent = NULL;
4797
4798         if (new_file_acl == NULL) {
4799                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4800                 return False;
4801         }
4802
4803         /* Now create the u/g/w entries. */
4804         if (sys_acl_create_entry(&new_file_acl, &user_ent) == -1) {
4805                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4806                         fname, strerror(errno) ));
4807                 goto done;
4808         }
4809         if (sys_acl_set_tag_type(user_ent, SMB_ACL_USER_OBJ) == -1) {
4810                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4811                         fname, strerror(errno) ));
4812                 goto done;
4813         }
4814
4815         if (sys_acl_create_entry(&new_file_acl, &group_ent) == -1) {
4816                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4817                         fname, strerror(errno) ));
4818                 goto done;
4819         }
4820         if (sys_acl_set_tag_type(group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4821                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4822                         fname, strerror(errno) ));
4823                 goto done;
4824         }
4825
4826         if (sys_acl_create_entry(&new_file_acl, &other_ent) == -1) {
4827                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4828                         fname, strerror(errno) ));
4829                 goto done;
4830         }
4831         if (sys_acl_set_tag_type(other_ent, SMB_ACL_OTHER) == -1) {
4832                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4833                         fname, strerror(errno) ));
4834                 goto done;
4835         }
4836
4837         /* Get the current file ACL. */
4838         if (fsp && fsp->fh->fd != -1) {
4839                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos());
4840         } else {
4841                 file_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4842                                                     SMB_ACL_TYPE_ACCESS,
4843                                                     talloc_tos());
4844         }
4845
4846         if (file_acl == NULL) {
4847                 /* This is only returned if an error occurred. Even for a file with
4848                    no acl a u/g/w acl should be returned. */
4849                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4850                         fname, strerror(errno) ));
4851                 goto done;
4852         }
4853
4854         while ( sys_acl_get_entry(file_acl, entry_id, &entry) == 1) {
4855                 SMB_ACL_TAG_T tagtype;
4856                 SMB_ACL_PERMSET_T permset;
4857
4858                 entry_id = SMB_ACL_NEXT_ENTRY;
4859
4860                 if (sys_acl_get_tag_type(entry, &tagtype) == -1) {
4861                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4862                                 fname, strerror(errno) ));
4863                         goto done;
4864                 }
4865
4866                 if (sys_acl_get_permset(entry, &permset) == -1) {
4867                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4868                                 fname, strerror(errno) ));
4869                         goto done;
4870                 }
4871
4872                 if (tagtype == SMB_ACL_USER_OBJ) {
4873                         if (sys_acl_set_permset(user_ent, permset) == -1) {
4874                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4875                                         fname, strerror(errno) ));
4876                         }
4877                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4878                         if (sys_acl_set_permset(group_ent, permset) == -1) {
4879                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4880                                         fname, strerror(errno) ));
4881                         }
4882                 } else if (tagtype == SMB_ACL_OTHER) {
4883                         if (sys_acl_set_permset(other_ent, permset) == -1) {
4884                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4885                                         fname, strerror(errno) ));
4886                         }
4887                 }
4888         }
4889
4890         /* Set the new empty file ACL. */
4891         if (fsp && fsp->fh->fd != -1) {
4892                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4893                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4894                                 fname, strerror(errno) ));
4895                         goto done;
4896                 }
4897         } else {
4898                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4899                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4900                                 fname, strerror(errno) ));
4901                         goto done;
4902                 }
4903         }
4904
4905         ret = True;
4906
4907  done:
4908
4909         if (file_acl) {
4910                 TALLOC_FREE(file_acl);
4911         }
4912         if (new_file_acl) {
4913                 TALLOC_FREE(new_file_acl);
4914         }
4915         return ret;
4916 }
4917
4918 /****************************************************************************
4919  Calls from UNIX extensions - POSIX ACL set.
4920  If num_def_acls == 0 then read/modify/write acl after removing all entries
4921  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4922 ****************************************************************************/
4923
4924 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4925 {
4926         SMB_ACL_T file_acl = NULL;
4927
4928         if (!num_acls) {
4929                 /* Remove the ACL from the file. */
4930                 return remove_posix_acl(conn, fsp, fname);
4931         }
4932
4933         if ((file_acl = create_posix_acl_from_wire(conn, num_acls,
4934                                                    pdata,
4935                                                    talloc_tos())) == NULL) {
4936                 return False;
4937         }
4938
4939         if (fsp && fsp->fh->fd != -1) {
4940                 /* The preferred way - use an open fd. */
4941                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4942                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4943                                 fname, strerror(errno) ));
4944                         TALLOC_FREE(file_acl);
4945                         return False;
4946                 }
4947         } else {
4948                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4949                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4950                                 fname, strerror(errno) ));
4951                         TALLOC_FREE(file_acl);
4952                         return False;
4953                 }
4954         }
4955
4956         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4957         TALLOC_FREE(file_acl);
4958         return True;
4959 }
4960
4961 /********************************************************************
4962  Pull the NT ACL from a file on disk or the OpenEventlog() access
4963  check.  Caller is responsible for freeing the returned security
4964  descriptor via TALLOC_FREE().  This is designed for dealing with
4965  user space access checks in smbd outside of the VFS.  For example,
4966  checking access rights in OpenEventlog().
4967
4968  Assume we are dealing with files (for now)
4969 ********************************************************************/
4970
4971 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname, uint32 security_info_wanted)
4972 {
4973         struct security_descriptor *ret_sd;
4974         connection_struct *conn;
4975         files_struct finfo;
4976         struct fd_handle fh;
4977         NTSTATUS status;
4978         TALLOC_CTX *frame = talloc_stackframe();
4979
4980         conn = talloc_zero(frame, connection_struct);
4981         if (conn == NULL) {
4982                 DEBUG(0, ("talloc failed\n"));
4983                 return NULL;
4984         }
4985
4986         if (!(conn->params = talloc(conn, struct share_params))) {
4987                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4988                 TALLOC_FREE(frame);
4989                 return NULL;
4990         }
4991
4992         conn->params->service = -1;
4993
4994         set_conn_connectpath(conn, "/");
4995
4996         if (!smbd_vfs_init(conn)) {
4997                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4998                 conn_free(conn);
4999                 TALLOC_FREE(frame);
5000                 return NULL;
5001         }
5002
5003         ZERO_STRUCT( finfo );
5004         ZERO_STRUCT( fh );
5005
5006         finfo.fnum = FNUM_FIELD_INVALID;
5007         finfo.conn = conn;
5008         finfo.fh = &fh;
5009         finfo.fh->fd = -1;
5010
5011         status = create_synthetic_smb_fname(frame, fname, NULL, NULL,
5012                                             &finfo.fsp_name);
5013         if (!NT_STATUS_IS_OK(status)) {
5014                 conn_free(conn);
5015                 TALLOC_FREE(frame);
5016                 return NULL;
5017         }
5018
5019         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo,
5020                                                   security_info_wanted,
5021                                                   ctx, &ret_sd))) {
5022                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
5023                 TALLOC_FREE(finfo.fsp_name);
5024                 conn_free(conn);
5025                 TALLOC_FREE(frame);
5026                 return NULL;
5027         }
5028
5029         TALLOC_FREE(finfo.fsp_name);
5030         conn_free(conn);
5031         TALLOC_FREE(frame);
5032
5033         return ret_sd;
5034 }
5035
5036 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
5037
5038 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
5039                                         const char *name,
5040                                         SMB_STRUCT_STAT *psbuf,
5041                                         struct security_descriptor **ppdesc)
5042 {
5043         struct dom_sid owner_sid, group_sid;
5044         size_t size = 0;
5045         struct security_ace aces[4];
5046         uint32_t access_mask = 0;
5047         mode_t mode = psbuf->st_ex_mode;
5048         struct security_acl *new_dacl = NULL;
5049         int idx = 0;
5050
5051         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
5052                 name, (int)mode ));
5053
5054         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
5055         gid_to_sid(&group_sid, psbuf->st_ex_gid);
5056
5057         /*
5058          We provide up to 4 ACEs
5059                 - Owner
5060                 - Group
5061                 - Everyone
5062                 - NT System
5063         */
5064
5065         if (mode & S_IRUSR) {
5066                 if (mode & S_IWUSR) {
5067                         access_mask |= SEC_RIGHTS_FILE_ALL;
5068                 } else {
5069                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
5070                 }
5071         }
5072         if (mode & S_IWUSR) {
5073                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
5074         }
5075
5076         init_sec_ace(&aces[idx],
5077                         &owner_sid,
5078                         SEC_ACE_TYPE_ACCESS_ALLOWED,
5079                         access_mask,
5080                         0);
5081         idx++;
5082
5083         access_mask = 0;
5084         if (mode & S_IRGRP) {
5085                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
5086         }
5087         if (mode & S_IWGRP) {
5088                 /* note that delete is not granted - this matches posix behaviour */
5089                 access_mask |= SEC_RIGHTS_FILE_WRITE;
5090         }
5091         if (access_mask) {
5092                 init_sec_ace(&aces[idx],
5093                         &group_sid,
5094                         SEC_ACE_TYPE_ACCESS_ALLOWED,
5095                         access_mask,
5096                         0);
5097                 idx++;
5098         }
5099
5100         access_mask = 0;
5101         if (mode & S_IROTH) {
5102                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
5103         }
5104         if (mode & S_IWOTH) {
5105                 access_mask |= SEC_RIGHTS_FILE_WRITE;
5106         }
5107         if (access_mask) {
5108                 init_sec_ace(&aces[idx],
5109                         &global_sid_World,
5110                         SEC_ACE_TYPE_ACCESS_ALLOWED,
5111                         access_mask,
5112                         0);
5113                 idx++;
5114         }
5115
5116         init_sec_ace(&aces[idx],
5117                         &global_sid_System,
5118                         SEC_ACE_TYPE_ACCESS_ALLOWED,
5119                         SEC_RIGHTS_FILE_ALL,
5120                         0);
5121         idx++;
5122
5123         new_dacl = make_sec_acl(ctx,
5124                         NT4_ACL_REVISION,
5125                         idx,
5126                         aces);
5127
5128         if (!new_dacl) {
5129                 return NT_STATUS_NO_MEMORY;
5130         }
5131
5132         *ppdesc = make_sec_desc(ctx,
5133                         SECURITY_DESCRIPTOR_REVISION_1,
5134                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
5135                         &owner_sid,
5136                         &group_sid,
5137                         NULL,
5138                         new_dacl,
5139                         &size);
5140         if (!*ppdesc) {
5141                 return NT_STATUS_NO_MEMORY;
5142         }
5143         return NT_STATUS_OK;
5144 }
5145
5146 int posix_sys_acl_blob_get_file(vfs_handle_struct *handle,
5147                                 const char *path_p,
5148                                 TALLOC_CTX *mem_ctx,
5149                                 char **blob_description,
5150                                 DATA_BLOB *blob)
5151 {
5152         int ret;
5153         TALLOC_CTX *frame = talloc_stackframe();
5154         struct smb_acl_wrapper acl_wrapper = {};
5155         struct smb_filename *smb_fname = NULL;
5156         NTSTATUS status = create_synthetic_smb_fname_split(frame, path_p,
5157                                                            NULL,
5158                                                            &smb_fname);
5159         if (!NT_STATUS_IS_OK(status)) {
5160                 errno = map_errno_from_nt_status(status);
5161                 TALLOC_FREE(frame);
5162                 return -1;
5163         }
5164
5165         acl_wrapper.access_acl
5166                 = smb_vfs_call_sys_acl_get_file(handle,
5167                                                 path_p,
5168                                                 SMB_ACL_TYPE_ACCESS,
5169                                                 frame);
5170
5171         ret = smb_vfs_call_stat(handle, smb_fname);
5172         if (ret == -1) {
5173                 TALLOC_FREE(frame);
5174                 return -1;
5175         }
5176
5177         if (S_ISDIR(smb_fname->st.st_ex_mode)) {
5178                 acl_wrapper.default_acl
5179                         = smb_vfs_call_sys_acl_get_file(handle,
5180                                                         path_p,
5181                                                         SMB_ACL_TYPE_DEFAULT,
5182                                                         frame);
5183         }
5184
5185         acl_wrapper.owner = smb_fname->st.st_ex_uid;
5186         acl_wrapper.group = smb_fname->st.st_ex_gid;
5187         acl_wrapper.mode = smb_fname->st.st_ex_mode;
5188
5189         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
5190                                                           &acl_wrapper,
5191                                                           (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
5192                 errno = EINVAL;
5193                 TALLOC_FREE(frame);
5194                 return -1;
5195         }
5196
5197         *blob_description = talloc_strdup(mem_ctx, "posix_acl");
5198         if (!*blob_description) {
5199                 errno = EINVAL;
5200                 TALLOC_FREE(frame);
5201                 return -1;
5202         }
5203
5204         TALLOC_FREE(frame);
5205         return 0;
5206 }
5207
5208 int posix_sys_acl_blob_get_fd(vfs_handle_struct *handle,
5209                               files_struct *fsp,
5210                               TALLOC_CTX *mem_ctx,
5211                               char **blob_description,
5212                               DATA_BLOB *blob)
5213 {
5214         SMB_STRUCT_STAT sbuf;
5215         TALLOC_CTX *frame;
5216         struct smb_acl_wrapper acl_wrapper;
5217         int ret;
5218
5219         /* This ensures that we also consider the default ACL */
5220         if (fsp->is_directory ||  fsp->fh->fd == -1) {
5221                 return posix_sys_acl_blob_get_file(handle, fsp->fsp_name->base_name,
5222                                                    mem_ctx, blob_description, blob);
5223         }
5224         frame = talloc_stackframe();
5225
5226         acl_wrapper.default_acl = NULL;
5227
5228         acl_wrapper.access_acl = smb_vfs_call_sys_acl_get_file(handle, fsp->fsp_name->base_name,
5229                                                                SMB_ACL_TYPE_ACCESS, frame);
5230
5231         ret = smb_vfs_call_fstat(handle, fsp, &sbuf);
5232         if (ret == -1) {
5233                 TALLOC_FREE(frame);
5234                 return -1;
5235         }
5236
5237         acl_wrapper.owner = sbuf.st_ex_uid;
5238         acl_wrapper.group = sbuf.st_ex_gid;
5239         acl_wrapper.mode = sbuf.st_ex_mode;
5240
5241         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
5242                                                           &acl_wrapper,
5243                                                           (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
5244                 errno = EINVAL;
5245                 TALLOC_FREE(frame);
5246                 return -1;
5247         }
5248
5249         *blob_description = talloc_strdup(mem_ctx, "posix_acl");
5250         if (!*blob_description) {
5251                 errno = EINVAL;
5252                 TALLOC_FREE(frame);
5253                 return -1;
5254         }
5255
5256         TALLOC_FREE(frame);
5257         return 0;
5258 }