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  Map canon_ace perms to permission bits NT.
1063  The attr element is not used here - we only process deny entries on set,
1064  not get. Deny entries are implicit on get with ace->perms = 0.
1065 ****************************************************************************/
1066
1067 uint32_t map_canon_ace_perms(int snum,
1068                                 enum security_ace_type *pacl_type,
1069                                 mode_t perms,
1070                                 bool directory_ace)
1071 {
1072         uint32_t nt_mask = 0;
1073
1074         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1075
1076         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1077                 if (directory_ace) {
1078                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1079                 } else {
1080                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1081                 }
1082         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1083                 /*
1084                  * Windows NT refuses to display ACEs with no permissions in them (but
1085                  * they are perfectly legal with Windows 2000). If the ACE has empty
1086                  * permissions we cannot use 0, so we use the otherwise unused
1087                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1088                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1089                  * to be changed in the future.
1090                  */
1091
1092                 nt_mask = 0;
1093         } else {
1094                 if (directory_ace) {
1095                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1096                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1097                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1098                 } else {
1099                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1100                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1101                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1102                 }
1103         }
1104
1105         if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1106                 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1107         }
1108
1109         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1110                         (unsigned int)perms, (unsigned int)nt_mask ));
1111
1112         return nt_mask;
1113 }
1114
1115 /****************************************************************************
1116  Map NT perms to a UNIX mode_t.
1117 ****************************************************************************/
1118
1119 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1120 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1121 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1122
1123 static mode_t map_nt_perms( uint32 *mask, int type)
1124 {
1125         mode_t mode = 0;
1126
1127         switch(type) {
1128         case S_IRUSR:
1129                 if((*mask) & GENERIC_ALL_ACCESS)
1130                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1131                 else {
1132                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1133                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1134                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1135                 }
1136                 break;
1137         case S_IRGRP:
1138                 if((*mask) & GENERIC_ALL_ACCESS)
1139                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1140                 else {
1141                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1142                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1143                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1144                 }
1145                 break;
1146         case S_IROTH:
1147                 if((*mask) & GENERIC_ALL_ACCESS)
1148                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1149                 else {
1150                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1151                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1152                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1153                 }
1154                 break;
1155         }
1156
1157         return mode;
1158 }
1159
1160 /****************************************************************************
1161  Unpack a struct security_descriptor into a UNIX owner and group.
1162 ****************************************************************************/
1163
1164 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1165                         uid_t *puser, gid_t *pgrp,
1166                         uint32 security_info_sent, const struct
1167                         security_descriptor *psd)
1168 {
1169         struct dom_sid owner_sid;
1170         struct dom_sid grp_sid;
1171
1172         *puser = (uid_t)-1;
1173         *pgrp = (gid_t)-1;
1174
1175         if(security_info_sent == 0) {
1176                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1177                 return NT_STATUS_OK;
1178         }
1179
1180         /*
1181          * Validate the owner and group SID's.
1182          */
1183
1184         memset(&owner_sid, '\0', sizeof(owner_sid));
1185         memset(&grp_sid, '\0', sizeof(grp_sid));
1186
1187         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1188
1189         /*
1190          * Don't immediately fail if the owner sid cannot be validated.
1191          * This may be a group chown only set.
1192          */
1193
1194         if (security_info_sent & SECINFO_OWNER) {
1195                 sid_copy(&owner_sid, psd->owner_sid);
1196                 if (!sid_to_uid(&owner_sid, puser)) {
1197                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1198                                 /* this allows take ownership to work
1199                                  * reasonably */
1200                                 *puser = get_current_uid(conn);
1201                         } else {
1202                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1203                                          " owner sid for %s\n",
1204                                          sid_string_dbg(&owner_sid)));
1205                                 return NT_STATUS_INVALID_OWNER;
1206                         }
1207                 }
1208                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1209                          (unsigned int)*puser ));
1210         }
1211
1212         /*
1213          * Don't immediately fail if the group sid cannot be validated.
1214          * This may be an owner chown only set.
1215          */
1216
1217         if (security_info_sent & SECINFO_GROUP) {
1218                 sid_copy(&grp_sid, psd->group_sid);
1219                 if (!sid_to_gid( &grp_sid, pgrp)) {
1220                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1221                                 /* this allows take group ownership to work
1222                                  * reasonably */
1223                                 *pgrp = get_current_gid(conn);
1224                         } else {
1225                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1226                                          " group sid.\n"));
1227                                 return NT_STATUS_INVALID_OWNER;
1228                         }
1229                 }
1230                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1231                          (unsigned int)*pgrp));
1232         }
1233
1234         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1235
1236         return NT_STATUS_OK;
1237 }
1238
1239 /****************************************************************************
1240  Ensure the enforced permissions for this share apply.
1241 ****************************************************************************/
1242
1243 static void apply_default_perms(const struct share_params *params,
1244                                 const bool is_directory, canon_ace *pace,
1245                                 mode_t type)
1246 {
1247         mode_t and_bits = (mode_t)0;
1248         mode_t or_bits = (mode_t)0;
1249
1250         /* Get the initial bits to apply. */
1251
1252         if (is_directory) {
1253                 and_bits = lp_dir_mask(params->service);
1254                 or_bits = lp_force_dir_mode(params->service);
1255         } else {
1256                 and_bits = lp_create_mask(params->service);
1257                 or_bits = lp_force_create_mode(params->service);
1258         }
1259
1260         /* Now bounce them into the S_USR space. */
1261         switch(type) {
1262         case S_IRUSR:
1263                 /* Ensure owner has read access. */
1264                 pace->perms |= S_IRUSR;
1265                 if (is_directory)
1266                         pace->perms |= (S_IWUSR|S_IXUSR);
1267                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1268                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1269                 break;
1270         case S_IRGRP:
1271                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1272                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1273                 break;
1274         case S_IROTH:
1275                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1276                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1277                 break;
1278         }
1279
1280         pace->perms = ((pace->perms & and_bits)|or_bits);
1281 }
1282
1283 /****************************************************************************
1284  Check if a given uid/SID is in a group gid/SID. This is probably very
1285  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1286 ****************************************************************************/
1287
1288 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1289 {
1290         /* "Everyone" always matches every uid. */
1291
1292         if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1293                 return True;
1294
1295         /*
1296          * if it's the current user, we already have the unix token
1297          * and don't need to do the complex user_in_group_sid() call
1298          */
1299         if (uid_ace->unix_ug.id == get_current_uid(conn)) {
1300                 const struct security_unix_token *curr_utok = NULL;
1301                 size_t i;
1302
1303                 if (group_ace->unix_ug.id == get_current_gid(conn)) {
1304                         return True;
1305                 }
1306
1307                 curr_utok = get_current_utok(conn);
1308                 for (i=0; i < curr_utok->ngroups; i++) {
1309                         if (group_ace->unix_ug.id == curr_utok->groups[i]) {
1310                                 return True;
1311                         }
1312                 }
1313         }
1314
1315         /*
1316          * user_in_group_sid() uses create_token_from_sid()
1317          * which creates an artificial NT token given just a username,
1318          * so this is not reliable for users from foreign domains
1319          * exported by winbindd!
1320          */
1321         return user_sid_in_group_sid(&uid_ace->trustee, &group_ace->trustee);
1322 }
1323
1324 /****************************************************************************
1325  A well formed POSIX file or default ACL has at least 3 entries, a
1326  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1327  In addition, the owner must always have at least read access.
1328  When using this call on get_acl, the pst struct is valid and contains
1329  the mode of the file.
1330 ****************************************************************************/
1331
1332 static bool ensure_canon_entry_valid_on_get(connection_struct *conn,
1333                                         canon_ace **pp_ace,
1334                                         const struct dom_sid *pfile_owner_sid,
1335                                         const struct dom_sid *pfile_grp_sid,
1336                                         const SMB_STRUCT_STAT *pst)
1337 {
1338         canon_ace *pace;
1339         bool got_user = false;
1340         bool got_group = false;
1341         bool got_other = false;
1342
1343         for (pace = *pp_ace; pace; pace = pace->next) {
1344                 if (pace->type == SMB_ACL_USER_OBJ) {
1345                         got_user = true;
1346                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1347                         got_group = true;
1348                 } else if (pace->type == SMB_ACL_OTHER) {
1349                         got_other = true;
1350                 }
1351         }
1352
1353         if (!got_user) {
1354                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1355                         DEBUG(0,("malloc fail.\n"));
1356                         return false;
1357                 }
1358
1359                 ZERO_STRUCTP(pace);
1360                 pace->type = SMB_ACL_USER_OBJ;
1361                 pace->owner_type = UID_ACE;
1362                 pace->unix_ug.type = ID_TYPE_UID;
1363                 pace->unix_ug.id = pst->st_ex_uid;
1364                 pace->trustee = *pfile_owner_sid;
1365                 pace->attr = ALLOW_ACE;
1366                 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1367                 DLIST_ADD(*pp_ace, pace);
1368         }
1369
1370         if (!got_group) {
1371                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1372                         DEBUG(0,("malloc fail.\n"));
1373                         return false;
1374                 }
1375
1376                 ZERO_STRUCTP(pace);
1377                 pace->type = SMB_ACL_GROUP_OBJ;
1378                 pace->owner_type = GID_ACE;
1379                 pace->unix_ug.type = ID_TYPE_GID;
1380                 pace->unix_ug.id = pst->st_ex_gid;
1381                 pace->trustee = *pfile_grp_sid;
1382                 pace->attr = ALLOW_ACE;
1383                 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1384                 DLIST_ADD(*pp_ace, pace);
1385         }
1386
1387         if (!got_other) {
1388                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1389                         DEBUG(0,("malloc fail.\n"));
1390                         return false;
1391                 }
1392
1393                 ZERO_STRUCTP(pace);
1394                 pace->type = SMB_ACL_OTHER;
1395                 pace->owner_type = WORLD_ACE;
1396                 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1397                 pace->unix_ug.id = -1;
1398                 pace->trustee = global_sid_World;
1399                 pace->attr = ALLOW_ACE;
1400                 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1401                 DLIST_ADD(*pp_ace, pace);
1402         }
1403
1404         return true;
1405 }
1406
1407 /****************************************************************************
1408  A well formed POSIX file or default ACL has at least 3 entries, a
1409  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1410  In addition, the owner must always have at least read access.
1411  When using this call on set_acl, the pst struct has
1412  been modified to have a mode containing the default for this file or directory
1413  type.
1414 ****************************************************************************/
1415
1416 static bool ensure_canon_entry_valid_on_set(connection_struct *conn,
1417                                         canon_ace **pp_ace,
1418                                         bool is_default_acl,
1419                                         const struct share_params *params,
1420                                         const bool is_directory,
1421                                         const struct dom_sid *pfile_owner_sid,
1422                                         const struct dom_sid *pfile_grp_sid,
1423                                         const SMB_STRUCT_STAT *pst)
1424 {
1425         canon_ace *pace;
1426         canon_ace *pace_user = NULL;
1427         canon_ace *pace_group = NULL;
1428         canon_ace *pace_other = NULL;
1429         bool got_duplicate_user = false;
1430         bool got_duplicate_group = false;
1431
1432         for (pace = *pp_ace; pace; pace = pace->next) {
1433                 if (pace->type == SMB_ACL_USER_OBJ) {
1434                         /*
1435                          * Ensure we have default parameters for the
1436                          * user (owner) even on default ACLs.
1437                          */
1438                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1439                         pace_user = pace;
1440
1441                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1442
1443                         /*
1444                          * Ensure create mask/force create mode is respected on set.
1445                          */
1446
1447                         if (!is_default_acl) {
1448                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1449                         }
1450                         pace_group = pace;
1451
1452                 } else if (pace->type == SMB_ACL_OTHER) {
1453
1454                         /*
1455                          * Ensure create mask/force create mode is respected on set.
1456                          */
1457
1458                         if (!is_default_acl) {
1459                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1460                         }
1461                         pace_other = pace;
1462
1463                 } else if (pace->type == SMB_ACL_USER || pace->type == SMB_ACL_GROUP) {
1464
1465                         /*
1466                          * Ensure create mask/force create mode is respected on set.
1467                          */
1468
1469                         if (!is_default_acl) {
1470                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1471                         }
1472                 }
1473         }
1474
1475         if (!pace_user) {
1476                 canon_ace *pace_iter;
1477
1478                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1479                         DEBUG(0,("talloc fail.\n"));
1480                         return false;
1481                 }
1482
1483                 ZERO_STRUCTP(pace);
1484                 pace->type = SMB_ACL_USER_OBJ;
1485                 pace->owner_type = UID_ACE;
1486                 pace->unix_ug.type = ID_TYPE_UID;
1487                 pace->unix_ug.id = pst->st_ex_uid;
1488                 pace->trustee = *pfile_owner_sid;
1489                 pace->attr = ALLOW_ACE;
1490                 /* Start with existing user permissions, principle of least
1491                    surprises for the user. */
1492                 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1493
1494                 /* See if the owning user is in any of the other groups in
1495                    the ACE, or if there's a matching user entry (by uid
1496                    or in the case of ID_TYPE_BOTH by SID).
1497                    If so, OR in the permissions from that entry. */
1498
1499
1500                 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1501                         if (pace_iter->type == SMB_ACL_USER &&
1502                                         pace_iter->unix_ug.id == pace->unix_ug.id) {
1503                                 pace->perms |= pace_iter->perms;
1504                         } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1505                                 if (dom_sid_equal(&pace->trustee, &pace_iter->trustee)) {
1506                                         pace->perms |= pace_iter->perms;
1507                                 } else if (uid_entry_in_group(conn, pace, pace_iter)) {
1508                                         pace->perms |= pace_iter->perms;
1509                                 }
1510                         }
1511                 }
1512
1513                 if (pace->perms == 0) {
1514                         /* If we only got an "everyone" perm, just use that. */
1515                         if (pace_other)
1516                                 pace->perms = pace_other->perms;
1517                 }
1518
1519                 /*
1520                  * Ensure we have default parameters for the
1521                  * user (owner) even on default ACLs.
1522                  */
1523                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1524
1525                 DLIST_ADD(*pp_ace, pace);
1526                 pace_user = pace;
1527         }
1528
1529         if (!pace_group) {
1530                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1531                         DEBUG(0,("talloc fail.\n"));
1532                         return false;
1533                 }
1534
1535                 ZERO_STRUCTP(pace);
1536                 pace->type = SMB_ACL_GROUP_OBJ;
1537                 pace->owner_type = GID_ACE;
1538                 pace->unix_ug.type = ID_TYPE_GID;
1539                 pace->unix_ug.id = pst->st_ex_gid;
1540                 pace->trustee = *pfile_grp_sid;
1541                 pace->attr = ALLOW_ACE;
1542
1543                 /* If we only got an "everyone" perm, just use that. */
1544                 if (pace_other) {
1545                         pace->perms = pace_other->perms;
1546                 } else {
1547                         pace->perms = 0;
1548                 }
1549                 if (!is_default_acl) {
1550                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1551                 }
1552
1553                 DLIST_ADD(*pp_ace, pace);
1554                 pace_group = pace;
1555         }
1556
1557         if (!pace_other) {
1558                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1559                         DEBUG(0,("talloc fail.\n"));
1560                         return false;
1561                 }
1562
1563                 ZERO_STRUCTP(pace);
1564                 pace->type = SMB_ACL_OTHER;
1565                 pace->owner_type = WORLD_ACE;
1566                 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1567                 pace->unix_ug.id = -1;
1568                 pace->trustee = global_sid_World;
1569                 pace->attr = ALLOW_ACE;
1570                 pace->perms = 0;
1571                 if (!is_default_acl) {
1572                         apply_default_perms(params, is_directory, pace, S_IROTH);
1573                 }
1574
1575                 DLIST_ADD(*pp_ace, pace);
1576                 pace_other = pace;
1577         }
1578
1579         /* Ensure when setting a POSIX ACL, that the uid for a
1580            SMB_ACL_USER_OBJ ACE (the owner ACE entry) has a duplicate
1581            permission entry as an SMB_ACL_USER, and a gid for a
1582            SMB_ACL_GROUP_OBJ ACE (the primary group ACE entry) also has
1583            a duplicate permission entry as an SMB_ACL_GROUP. If not,
1584            then if the ownership or group ownership of this file or
1585            directory gets changed, the user or group can lose their
1586            access. */
1587
1588         for (pace = *pp_ace; pace; pace = pace->next) {
1589                 if (pace->type == SMB_ACL_USER &&
1590                                 pace->unix_ug.id == pace_user->unix_ug.id) {
1591                         /* Already got one. */
1592                         got_duplicate_user = true;
1593                 } else if (pace->type == SMB_ACL_GROUP &&
1594                                 pace->unix_ug.id == pace_group->unix_ug.id) {
1595                         /* Already got one. */
1596                         got_duplicate_group = true;
1597                 } else if ((pace->type == SMB_ACL_GROUP)
1598                            && (dom_sid_equal(&pace->trustee, &pace_user->trustee))) {
1599                         /* If the SID owning the file appears
1600                          * in a group entry, then we have
1601                          * enough duplication, they will still
1602                          * have access */
1603                         got_duplicate_user = true;
1604                 }
1605         }
1606
1607         /* If the SID is equal for the user and group that we need
1608            to add the duplicate for, add only the group */
1609         if (!got_duplicate_user && !got_duplicate_group
1610                         && dom_sid_equal(&pace_group->trustee,
1611                                         &pace_user->trustee)) {
1612                 /* Add a duplicate SMB_ACL_GROUP entry, this
1613                  * will cover the owning SID as well, as it
1614                  * will always be mapped to both a uid and
1615                  * gid. */
1616
1617                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1618                         DEBUG(0,("talloc fail.\n"));
1619                         return false;
1620                 }
1621
1622                 ZERO_STRUCTP(pace);
1623                 pace->type = SMB_ACL_GROUP;;
1624                 pace->owner_type = GID_ACE;
1625                 pace->unix_ug.type = ID_TYPE_GID;
1626                 pace->unix_ug.id = pace_group->unix_ug.id;
1627                 pace->trustee = pace_group->trustee;
1628                 pace->attr = pace_group->attr;
1629                 pace->perms = pace_group->perms;
1630
1631                 DLIST_ADD(*pp_ace, pace);
1632
1633                 /* We're done here, make sure the
1634                    statements below are not executed. */
1635                 got_duplicate_user = true;
1636                 got_duplicate_group = true;
1637         }
1638
1639         if (!got_duplicate_user) {
1640                 /* Add a duplicate SMB_ACL_USER entry. */
1641                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1642                         DEBUG(0,("talloc fail.\n"));
1643                         return false;
1644                 }
1645
1646                 ZERO_STRUCTP(pace);
1647                 pace->type = SMB_ACL_USER;;
1648                 pace->owner_type = UID_ACE;
1649                 pace->unix_ug.type = ID_TYPE_UID;
1650                 pace->unix_ug.id = pace_user->unix_ug.id;
1651                 pace->trustee = pace_user->trustee;
1652                 pace->attr = pace_user->attr;
1653                 pace->perms = pace_user->perms;
1654
1655                 DLIST_ADD(*pp_ace, pace);
1656
1657                 got_duplicate_user = true;
1658         }
1659
1660         if (!got_duplicate_group) {
1661                 /* Add a duplicate SMB_ACL_GROUP entry. */
1662                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1663                         DEBUG(0,("talloc fail.\n"));
1664                         return false;
1665                 }
1666
1667                 ZERO_STRUCTP(pace);
1668                 pace->type = SMB_ACL_GROUP;;
1669                 pace->owner_type = GID_ACE;
1670                 pace->unix_ug.type = ID_TYPE_GID;
1671                 pace->unix_ug.id = pace_group->unix_ug.id;
1672                 pace->trustee = pace_group->trustee;
1673                 pace->attr = pace_group->attr;
1674                 pace->perms = pace_group->perms;
1675
1676                 DLIST_ADD(*pp_ace, pace);
1677
1678                 got_duplicate_group = true;
1679         }
1680
1681         return true;
1682 }
1683
1684 /****************************************************************************
1685  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1686  If it does not have them, check if there are any entries where the trustee is the
1687  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1688  Note we must not do this to default directory ACLs.
1689 ****************************************************************************/
1690
1691 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1692 {
1693         bool got_user_obj, got_group_obj;
1694         canon_ace *current_ace;
1695         int i, entries;
1696
1697         entries = count_canon_ace_list(ace);
1698         got_user_obj = False;
1699         got_group_obj = False;
1700
1701         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1702                 if (current_ace->type == SMB_ACL_USER_OBJ)
1703                         got_user_obj = True;
1704                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1705                         got_group_obj = True;
1706         }
1707         if (got_user_obj && got_group_obj) {
1708                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1709                 return;
1710         }
1711
1712         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1713                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1714                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1715                         current_ace->type = SMB_ACL_USER_OBJ;
1716                         got_user_obj = True;
1717                 }
1718                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1719                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1720                         current_ace->type = SMB_ACL_GROUP_OBJ;
1721                         got_group_obj = True;
1722                 }
1723         }
1724         if (!got_user_obj)
1725                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1726         if (!got_group_obj)
1727                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1728 }
1729
1730 static bool add_current_ace_to_acl(files_struct *fsp, struct security_ace *psa,
1731                                    canon_ace **file_ace, canon_ace **dir_ace,
1732                                    bool *got_file_allow, bool *got_dir_allow,
1733                                    bool *all_aces_are_inherit_only,
1734                                    canon_ace *current_ace)
1735 {
1736
1737         /*
1738          * Map the given NT permissions into a UNIX mode_t containing only
1739          * S_I(R|W|X)USR bits.
1740          */
1741
1742         current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1743         current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1744
1745         /* Store the ace_flag. */
1746         current_ace->ace_flags = psa->flags;
1747
1748         /*
1749          * Now add the created ace to either the file list, the directory
1750          * list, or both. We *MUST* preserve the order here (hence we use
1751          * DLIST_ADD_END) as NT ACLs are order dependent.
1752          */
1753
1754         if (fsp->is_directory) {
1755
1756                 /*
1757                  * We can only add to the default POSIX ACE list if the ACE is
1758                  * designed to be inherited by both files and directories.
1759                  */
1760
1761                 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1762                     (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1763
1764                         canon_ace *current_dir_ace = current_ace;
1765                         DLIST_ADD_END(*dir_ace, current_ace, canon_ace *);
1766
1767                         /*
1768                          * Note if this was an allow ace. We can't process
1769                          * any further deny ace's after this.
1770                          */
1771
1772                         if (current_ace->attr == ALLOW_ACE)
1773                                 *got_dir_allow = True;
1774
1775                         if ((current_ace->attr == DENY_ACE) && *got_dir_allow) {
1776                                 DEBUG(0,("add_current_ace_to_acl: "
1777                                          "malformed ACL in "
1778                                          "inheritable ACL! Deny entry "
1779                                          "after Allow entry. Failing "
1780                                          "to set on file %s.\n",
1781                                          fsp_str_dbg(fsp)));
1782                                 return False;
1783                         }
1784
1785                         if( DEBUGLVL( 10 )) {
1786                                 dbgtext("add_current_ace_to_acl: adding dir ACL:\n");
1787                                 print_canon_ace( current_ace, 0);
1788                         }
1789
1790                         /*
1791                          * If this is not an inherit only ACE we need to add a duplicate
1792                          * to the file acl.
1793                          */
1794
1795                         if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1796                                 canon_ace *dup_ace = dup_canon_ace(current_ace);
1797
1798                                 if (!dup_ace) {
1799                                         DEBUG(0,("add_current_ace_to_acl: malloc fail !\n"));
1800                                         return False;
1801                                 }
1802
1803                                 /*
1804                                  * We must not free current_ace here as its
1805                                  * pointer is now owned by the dir_ace list.
1806                                  */
1807                                 current_ace = dup_ace;
1808                                 /* We've essentially split this ace into two,
1809                                  * and added the ace with inheritance request
1810                                  * bits to the directory ACL. Drop those bits for
1811                                  * the ACE we're adding to the file list. */
1812                                 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1813                                                             SEC_ACE_FLAG_CONTAINER_INHERIT|
1814                                                             SEC_ACE_FLAG_INHERIT_ONLY);
1815                         } else {
1816                                 /*
1817                                  * We must not free current_ace here as its
1818                                  * pointer is now owned by the dir_ace list.
1819                                  */
1820                                 current_ace = NULL;
1821                         }
1822
1823                         /*
1824                          * current_ace is now either owned by file_ace
1825                          * or is NULL. We can safely operate on current_dir_ace
1826                          * to treat mapping for default acl entries differently
1827                          * than access acl entries.
1828                          */
1829
1830                         if (current_dir_ace->owner_type == UID_ACE) {
1831                                 /*
1832                                  * We already decided above this is a uid,
1833                                  * for default acls ace's only CREATOR_OWNER
1834                                  * maps to ACL_USER_OBJ. All other uid
1835                                  * ace's are ACL_USER.
1836                                  */
1837                                 if (dom_sid_equal(&current_dir_ace->trustee,
1838                                                   &global_sid_Creator_Owner)) {
1839                                         current_dir_ace->type = SMB_ACL_USER_OBJ;
1840                                 } else {
1841                                         current_dir_ace->type = SMB_ACL_USER;
1842                                 }
1843                         }
1844
1845                         if (current_dir_ace->owner_type == GID_ACE) {
1846                                 /*
1847                                  * We already decided above this is a gid,
1848                                  * for default acls ace's only CREATOR_GROUP
1849                                  * maps to ACL_GROUP_OBJ. All other uid
1850                                  * ace's are ACL_GROUP.
1851                                  */
1852                                 if (dom_sid_equal(&current_dir_ace->trustee,
1853                                                   &global_sid_Creator_Group)) {
1854                                         current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1855                                 } else {
1856                                         current_dir_ace->type = SMB_ACL_GROUP;
1857                                 }
1858                         }
1859                 }
1860         }
1861
1862         /*
1863          * Only add to the file ACL if not inherit only.
1864          */
1865
1866         if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1867                 DLIST_ADD_END(*file_ace, current_ace, canon_ace *);
1868
1869                 /*
1870                  * Note if this was an allow ace. We can't process
1871                  * any further deny ace's after this.
1872                  */
1873
1874                 if (current_ace->attr == ALLOW_ACE)
1875                         *got_file_allow = True;
1876
1877                 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1878                         DEBUG(0,("add_current_ace_to_acl: malformed "
1879                                  "ACL in file ACL ! Deny entry after "
1880                                  "Allow entry. Failing to set on file "
1881                                  "%s.\n", fsp_str_dbg(fsp)));
1882                         return False;
1883                 }
1884
1885                 if( DEBUGLVL( 10 )) {
1886                         dbgtext("add_current_ace_to_acl: adding file ACL:\n");
1887                         print_canon_ace( current_ace, 0);
1888                 }
1889                 *all_aces_are_inherit_only = False;
1890                 /*
1891                  * We must not free current_ace here as its
1892                  * pointer is now owned by the file_ace list.
1893                  */
1894                 current_ace = NULL;
1895         }
1896
1897         /*
1898          * Free if ACE was not added.
1899          */
1900
1901         TALLOC_FREE(current_ace);
1902         return true;
1903 }
1904
1905 /****************************************************************************
1906  Unpack a struct security_descriptor into two canonical ace lists.
1907 ****************************************************************************/
1908
1909 static bool create_canon_ace_lists(files_struct *fsp,
1910                                         const SMB_STRUCT_STAT *pst,
1911                                         struct dom_sid *pfile_owner_sid,
1912                                         struct dom_sid *pfile_grp_sid,
1913                                         canon_ace **ppfile_ace,
1914                                         canon_ace **ppdir_ace,
1915                                         const struct security_acl *dacl)
1916 {
1917         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1918         canon_ace *file_ace = NULL;
1919         canon_ace *dir_ace = NULL;
1920         canon_ace *current_ace = NULL;
1921         bool got_dir_allow = False;
1922         bool got_file_allow = False;
1923         int i, j;
1924
1925         *ppfile_ace = NULL;
1926         *ppdir_ace = NULL;
1927
1928         /*
1929          * Convert the incoming ACL into a more regular form.
1930          */
1931
1932         for(i = 0; i < dacl->num_aces; i++) {
1933                 struct security_ace *psa = &dacl->aces[i];
1934
1935                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1936                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1937                         return False;
1938                 }
1939         }
1940
1941         /*
1942          * Deal with the fact that NT 4.x re-writes the canonical format
1943          * that we return for default ACLs. If a directory ACE is identical
1944          * to a inherited directory ACE then NT changes the bits so that the
1945          * first ACE is set to OI|IO and the second ACE for this SID is set
1946          * to CI. We need to repair this. JRA.
1947          */
1948
1949         for(i = 0; i < dacl->num_aces; i++) {
1950                 struct security_ace *psa1 = &dacl->aces[i];
1951
1952                 for (j = i + 1; j < dacl->num_aces; j++) {
1953                         struct security_ace *psa2 = &dacl->aces[j];
1954
1955                         if (psa1->access_mask != psa2->access_mask)
1956                                 continue;
1957
1958                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1959                                 continue;
1960
1961                         /*
1962                          * Ok - permission bits and SIDs are equal.
1963                          * Check if flags were re-written.
1964                          */
1965
1966                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1967
1968                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1969                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1970
1971                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1972
1973                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1974                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1975
1976                         }
1977                 }
1978         }
1979
1980         for(i = 0; i < dacl->num_aces; i++) {
1981                 struct security_ace *psa = &dacl->aces[i];
1982
1983                 /*
1984                  * Create a canon_ace entry representing this NT DACL ACE.
1985                  */
1986
1987                 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1988                         free_canon_ace_list(file_ace);
1989                         free_canon_ace_list(dir_ace);
1990                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1991                         return False;
1992                 }
1993
1994                 ZERO_STRUCTP(current_ace);
1995
1996                 sid_copy(&current_ace->trustee, &psa->trustee);
1997
1998                 /*
1999                  * Try and work out if the SID is a user or group
2000                  * as we need to flag these differently for POSIX.
2001                  * Note what kind of a POSIX ACL this should map to.
2002                  */
2003
2004                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
2005                         current_ace->owner_type = WORLD_ACE;
2006                         current_ace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
2007                         current_ace->unix_ug.id = -1;
2008                         current_ace->type = SMB_ACL_OTHER;
2009                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
2010                         current_ace->owner_type = UID_ACE;
2011                         current_ace->unix_ug.type = ID_TYPE_UID;
2012                         current_ace->unix_ug.id = pst->st_ex_uid;
2013                         current_ace->type = SMB_ACL_USER_OBJ;
2014
2015                         /*
2016                          * The Creator Owner entry only specifies inheritable permissions,
2017                          * never access permissions. WinNT doesn't always set the ACE to
2018                          * INHERIT_ONLY, though.
2019                          */
2020
2021                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
2022
2023                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
2024                         current_ace->owner_type = GID_ACE;
2025                         current_ace->unix_ug.type = ID_TYPE_GID;
2026                         current_ace->unix_ug.id = pst->st_ex_gid;
2027                         current_ace->type = SMB_ACL_GROUP_OBJ;
2028
2029                         /*
2030                          * The Creator Group entry only specifies inheritable permissions,
2031                          * never access permissions. WinNT doesn't always set the ACE to
2032                          * INHERIT_ONLY, though.
2033                          */
2034                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
2035
2036                 } else {
2037                         struct unixid unixid;
2038
2039                         if (!sids_to_unixids(&current_ace->trustee, 1, &unixid)) {
2040                                 free_canon_ace_list(file_ace);
2041                                 free_canon_ace_list(dir_ace);
2042                                 TALLOC_FREE(current_ace);
2043                                 DEBUG(0, ("create_canon_ace_lists: sids_to_unixids "
2044                                         "failed for %s (allocation failure)\n",
2045                                         sid_string_dbg(&current_ace->trustee)));
2046                                 return false;
2047                         }
2048
2049                         if (unixid.type == ID_TYPE_BOTH) {
2050                                 /* If it's the owning user, this is a
2051                                  * user_obj, not a user.  This way, we
2052                                  * get a valid ACL for groups that own
2053                                  * files, without putting user ACL
2054                                  * entries in for groups otherwise */
2055                                 if (unixid.id == pst->st_ex_uid) {
2056                                         current_ace->owner_type = UID_ACE;
2057                                         current_ace->unix_ug.type = ID_TYPE_UID;
2058                                         current_ace->unix_ug.id = unixid.id;
2059                                         current_ace->type = SMB_ACL_USER_OBJ;
2060
2061                                         /* Add the user object to the posix ACL,
2062                                            and proceed to the group mapping
2063                                            below. This handles the talloc_free
2064                                            of current_ace if not added for some
2065                                            reason */
2066                                         if (!add_current_ace_to_acl(fsp,
2067                                                         psa,
2068                                                         &file_ace,
2069                                                         &dir_ace,
2070                                                         &got_file_allow,
2071                                                         &got_dir_allow,
2072                                                         &all_aces_are_inherit_only,
2073                                                         current_ace)) {
2074                                                 free_canon_ace_list(file_ace);
2075                                                 free_canon_ace_list(dir_ace);
2076                                                 return false;
2077                                         }
2078
2079                                         if ((current_ace = talloc(talloc_tos(),
2080                                                         canon_ace)) == NULL) {
2081                                                 free_canon_ace_list(file_ace);
2082                                                 free_canon_ace_list(dir_ace);
2083                                                 DEBUG(0,("create_canon_ace_lists: "
2084                                                         "malloc fail.\n"));
2085                                                 return False;
2086                                         }
2087
2088                                         ZERO_STRUCTP(current_ace);
2089                                 }
2090
2091                                 sid_copy(&current_ace->trustee, &psa->trustee);
2092
2093                                 current_ace->unix_ug.type = ID_TYPE_GID;
2094                                 current_ace->unix_ug.id = unixid.id;
2095                                 current_ace->owner_type = GID_ACE;
2096                                 /* If it's the primary group, this is a
2097                                    group_obj, not a group. */
2098                                 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2099                                         current_ace->type = SMB_ACL_GROUP_OBJ;
2100                                 } else {
2101                                         current_ace->type = SMB_ACL_GROUP;
2102                                 }
2103
2104                         } else if (unixid.type == ID_TYPE_UID) {
2105                                 current_ace->owner_type = UID_ACE;
2106                                 current_ace->unix_ug.type = ID_TYPE_UID;
2107                                 current_ace->unix_ug.id = unixid.id;
2108                                 /* If it's the owning user, this is a user_obj,
2109                                    not a user. */
2110                                 if (current_ace->unix_ug.id == pst->st_ex_uid) {
2111                                         current_ace->type = SMB_ACL_USER_OBJ;
2112                                 } else {
2113                                         current_ace->type = SMB_ACL_USER;
2114                                 }
2115                         } else if (unixid.type == ID_TYPE_GID) {
2116                                 current_ace->unix_ug.type = ID_TYPE_GID;
2117                                 current_ace->unix_ug.id = unixid.id;
2118                                 current_ace->owner_type = GID_ACE;
2119                                 /* If it's the primary group, this is a
2120                                    group_obj, not a group. */
2121                                 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2122                                         current_ace->type = SMB_ACL_GROUP_OBJ;
2123                                 } else {
2124                                         current_ace->type = SMB_ACL_GROUP;
2125                                 }
2126                         } else {
2127                                 /*
2128                                  * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
2129                                  */
2130
2131                                 if (non_mappable_sid(&psa->trustee)) {
2132                                         DEBUG(10, ("create_canon_ace_lists: ignoring "
2133                                                    "non-mappable SID %s\n",
2134                                                    sid_string_dbg(&psa->trustee)));
2135                                         TALLOC_FREE(current_ace);
2136                                         continue;
2137                                 }
2138
2139                                 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
2140                                         DEBUG(10, ("create_canon_ace_lists: ignoring "
2141                                                 "unknown or foreign SID %s\n",
2142                                                 sid_string_dbg(&psa->trustee)));
2143                                         TALLOC_FREE(current_ace);
2144                                         continue;
2145                                 }
2146
2147                                 free_canon_ace_list(file_ace);
2148                                 free_canon_ace_list(dir_ace);
2149                                 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
2150                                           "%s to uid or gid.\n",
2151                                           sid_string_dbg(&current_ace->trustee)));
2152                                 TALLOC_FREE(current_ace);
2153                                 return false;
2154                         }
2155                 }
2156
2157                 /* handles the talloc_free of current_ace if not added for some reason */
2158                 if (!add_current_ace_to_acl(fsp, psa, &file_ace, &dir_ace,
2159                                             &got_file_allow, &got_dir_allow,
2160                                             &all_aces_are_inherit_only, current_ace)) {
2161                         free_canon_ace_list(file_ace);
2162                         free_canon_ace_list(dir_ace);
2163                         return false;
2164                 }
2165         }
2166
2167         if (fsp->is_directory && all_aces_are_inherit_only) {
2168                 /*
2169                  * Windows 2000 is doing one of these weird 'inherit acl'
2170                  * traverses to conserve NTFS ACL resources. Just pretend
2171                  * there was no DACL sent. JRA.
2172                  */
2173
2174                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
2175                 free_canon_ace_list(file_ace);
2176                 free_canon_ace_list(dir_ace);
2177                 file_ace = NULL;
2178                 dir_ace = NULL;
2179         } else {
2180                 /*
2181                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
2182                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
2183                  * entries can be converted to *_OBJ. Don't do this for the default
2184                  * ACL, we will create them separately for this if needed inside
2185                  * ensure_canon_entry_valid_on_set().
2186                  */
2187                 if (file_ace) {
2188                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
2189                 }
2190         }
2191
2192         *ppfile_ace = file_ace;
2193         *ppdir_ace = dir_ace;
2194
2195         return True;
2196 }
2197
2198 /****************************************************************************
2199  ASCII art time again... JRA :-).
2200
2201  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2202  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2203  entries). Secondly, the merge code has ensured that all duplicate SID entries for
2204  allow or deny have been merged, so the same SID can only appear once in the deny
2205  list or once in the allow list.
2206
2207  We then process as follows :
2208
2209  ---------------------------------------------------------------------------
2210  First pass - look for a Everyone DENY entry.
2211
2212  If it is deny all (rwx) trunate the list at this point.
2213  Else, walk the list from this point and use the deny permissions of this
2214  entry as a mask on all following allow entries. Finally, delete
2215  the Everyone DENY entry (we have applied it to everything possible).
2216
2217  In addition, in this pass we remove any DENY entries that have
2218  no permissions (ie. they are a DENY nothing).
2219  ---------------------------------------------------------------------------
2220  Second pass - only deal with deny user entries.
2221
2222  DENY user1 (perms XXX)
2223
2224  new_perms = 0
2225  for all following allow group entries where user1 is in group
2226         new_perms |= group_perms;
2227
2228  user1 entry perms = new_perms & ~ XXX;
2229
2230  Convert the deny entry to an allow entry with the new perms and
2231  push to the end of the list. Note if the user was in no groups
2232  this maps to a specific allow nothing entry for this user.
2233
2234  The common case from the NT ACL choser (userX deny all) is
2235  optimised so we don't do the group lookup - we just map to
2236  an allow nothing entry.
2237
2238  What we're doing here is inferring the allow permissions the
2239  person setting the ACE on user1 wanted by looking at the allow
2240  permissions on the groups the user is currently in. This will
2241  be a snapshot, depending on group membership but is the best
2242  we can do and has the advantage of failing closed rather than
2243  open.
2244  ---------------------------------------------------------------------------
2245  Third pass - only deal with deny group entries.
2246
2247  DENY group1 (perms XXX)
2248
2249  for all following allow user entries where user is in group1
2250    user entry perms = user entry perms & ~ XXX;
2251
2252  If there is a group Everyone allow entry with permissions YYY,
2253  convert the group1 entry to an allow entry and modify its
2254  permissions to be :
2255
2256  new_perms = YYY & ~ XXX
2257
2258  and push to the end of the list.
2259
2260  If there is no group Everyone allow entry then convert the
2261  group1 entry to a allow nothing entry and push to the end of the list.
2262
2263  Note that the common case from the NT ACL choser (groupX deny all)
2264  cannot be optimised here as we need to modify user entries who are
2265  in the group to change them to a deny all also.
2266
2267  What we're doing here is modifying the allow permissions of
2268  user entries (which are more specific in POSIX ACLs) to mask
2269  out the explicit deny set on the group they are in. This will
2270  be a snapshot depending on current group membership but is the
2271  best we can do and has the advantage of failing closed rather
2272  than open.
2273  ---------------------------------------------------------------------------
2274  Fourth pass - cope with cumulative permissions.
2275
2276  for all allow user entries, if there exists an allow group entry with
2277  more permissive permissions, and the user is in that group, rewrite the
2278  allow user permissions to contain both sets of permissions.
2279
2280  Currently the code for this is #ifdef'ed out as these semantics make
2281  no sense to me. JRA.
2282  ---------------------------------------------------------------------------
2283
2284  Note we *MUST* do the deny user pass first as this will convert deny user
2285  entries into allow user entries which can then be processed by the deny
2286  group pass.
2287
2288  The above algorithm took a *lot* of thinking about - hence this
2289  explaination :-). JRA.
2290 ****************************************************************************/
2291
2292 /****************************************************************************
2293  Process a canon_ace list entries. This is very complex code. We need
2294  to go through and remove the "deny" permissions from any allow entry that matches
2295  the id of this entry. We have already refused any NT ACL that wasn't in correct
2296  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2297  we just remove it (to fail safe). We have already removed any duplicate ace
2298  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2299  allow entries.
2300 ****************************************************************************/
2301
2302 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2303 {
2304         canon_ace *ace_list = *pp_ace_list;
2305         canon_ace *curr_ace = NULL;
2306         canon_ace *curr_ace_next = NULL;
2307
2308         /* Pass 1 above - look for an Everyone, deny entry. */
2309
2310         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2311                 canon_ace *allow_ace_p;
2312
2313                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2314
2315                 if (curr_ace->attr != DENY_ACE)
2316                         continue;
2317
2318                 if (curr_ace->perms == (mode_t)0) {
2319
2320                         /* Deny nothing entry - delete. */
2321
2322                         DLIST_REMOVE(ace_list, curr_ace);
2323                         continue;
2324                 }
2325
2326                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2327                         continue;
2328
2329                 /* JRATEST - assert. */
2330                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2331
2332                 if (curr_ace->perms == ALL_ACE_PERMS) {
2333
2334                         /*
2335                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2336                          * list at this point including this entry.
2337                          */
2338
2339                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2340
2341                         free_canon_ace_list( curr_ace );
2342                         if (prev_entry)
2343                                 DLIST_REMOVE(ace_list, prev_entry);
2344                         else {
2345                                 /* We deleted the entire list. */
2346                                 ace_list = NULL;
2347                         }
2348                         break;
2349                 }
2350
2351                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2352
2353                         /*
2354                          * Only mask off allow entries.
2355                          */
2356
2357                         if (allow_ace_p->attr != ALLOW_ACE)
2358                                 continue;
2359
2360                         allow_ace_p->perms &= ~curr_ace->perms;
2361                 }
2362
2363                 /*
2364                  * Now it's been applied, remove it.
2365                  */
2366
2367                 DLIST_REMOVE(ace_list, curr_ace);
2368         }
2369
2370         /* Pass 2 above - deal with deny user entries. */
2371
2372         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2373                 mode_t new_perms = (mode_t)0;
2374                 canon_ace *allow_ace_p;
2375
2376                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2377
2378                 if (curr_ace->attr != DENY_ACE)
2379                         continue;
2380
2381                 if (curr_ace->owner_type != UID_ACE)
2382                         continue;
2383
2384                 if (curr_ace->perms == ALL_ACE_PERMS) {
2385
2386                         /*
2387                          * Optimisation - this is a deny everything to this user.
2388                          * Convert to an allow nothing and push to the end of the list.
2389                          */
2390
2391                         curr_ace->attr = ALLOW_ACE;
2392                         curr_ace->perms = (mode_t)0;
2393                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2394                         continue;
2395                 }
2396
2397                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2398
2399                         if (allow_ace_p->attr != ALLOW_ACE)
2400                                 continue;
2401
2402                         /* We process GID_ACE and WORLD_ACE entries only. */
2403
2404                         if (allow_ace_p->owner_type == UID_ACE)
2405                                 continue;
2406
2407                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2408                                 new_perms |= allow_ace_p->perms;
2409                 }
2410
2411                 /*
2412                  * Convert to a allow entry, modify the perms and push to the end
2413                  * of the list.
2414                  */
2415
2416                 curr_ace->attr = ALLOW_ACE;
2417                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2418                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2419         }
2420
2421         /* Pass 3 above - deal with deny group entries. */
2422
2423         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2424                 canon_ace *allow_ace_p;
2425                 canon_ace *allow_everyone_p = NULL;
2426
2427                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2428
2429                 if (curr_ace->attr != DENY_ACE)
2430                         continue;
2431
2432                 if (curr_ace->owner_type != GID_ACE)
2433                         continue;
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                         /* Store a pointer to the Everyone allow, if it exists. */
2441                         if (allow_ace_p->owner_type == WORLD_ACE)
2442                                 allow_everyone_p = allow_ace_p;
2443
2444                         /* We process UID_ACE entries only. */
2445
2446                         if (allow_ace_p->owner_type != UID_ACE)
2447                                 continue;
2448
2449                         /* Mask off the deny group perms. */
2450
2451                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2452                                 allow_ace_p->perms &= ~curr_ace->perms;
2453                 }
2454
2455                 /*
2456                  * Convert the deny to an allow with the correct perms and
2457                  * push to the end of the list.
2458                  */
2459
2460                 curr_ace->attr = ALLOW_ACE;
2461                 if (allow_everyone_p)
2462                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2463                 else
2464                         curr_ace->perms = (mode_t)0;
2465                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2466         }
2467
2468         /* Doing this fourth pass allows Windows semantics to be layered
2469          * on top of POSIX semantics. I'm not sure if this is desirable.
2470          * For example, in W2K ACLs there is no way to say, "Group X no
2471          * access, user Y full access" if user Y is a member of group X.
2472          * This seems completely broken semantics to me.... JRA.
2473          */
2474
2475 #if 0
2476         /* Pass 4 above - deal with allow entries. */
2477
2478         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2479                 canon_ace *allow_ace_p;
2480
2481                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2482
2483                 if (curr_ace->attr != ALLOW_ACE)
2484                         continue;
2485
2486                 if (curr_ace->owner_type != UID_ACE)
2487                         continue;
2488
2489                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2490
2491                         if (allow_ace_p->attr != ALLOW_ACE)
2492                                 continue;
2493
2494                         /* We process GID_ACE entries only. */
2495
2496                         if (allow_ace_p->owner_type != GID_ACE)
2497                                 continue;
2498
2499                         /* OR in the group perms. */
2500
2501                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2502                                 curr_ace->perms |= allow_ace_p->perms;
2503                 }
2504         }
2505 #endif
2506
2507         *pp_ace_list = ace_list;
2508 }
2509
2510 /****************************************************************************
2511  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2512  succeeding.
2513 ****************************************************************************/
2514
2515 static bool unpack_canon_ace(files_struct *fsp,
2516                                 const SMB_STRUCT_STAT *pst,
2517                                 struct dom_sid *pfile_owner_sid,
2518                                 struct dom_sid *pfile_grp_sid,
2519                                 canon_ace **ppfile_ace,
2520                                 canon_ace **ppdir_ace,
2521                                 uint32 security_info_sent,
2522                                 const struct security_descriptor *psd)
2523 {
2524         canon_ace *file_ace = NULL;
2525         canon_ace *dir_ace = NULL;
2526
2527         *ppfile_ace = NULL;
2528         *ppdir_ace = NULL;
2529
2530         if(security_info_sent == 0) {
2531                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2532                 return False;
2533         }
2534
2535         /*
2536          * If no DACL then this is a chown only security descriptor.
2537          */
2538
2539         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2540                 return True;
2541
2542         /*
2543          * Now go through the DACL and create the canon_ace lists.
2544          */
2545
2546         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2547                                                                 &file_ace, &dir_ace, psd->dacl))
2548                 return False;
2549
2550         if ((file_ace == NULL) && (dir_ace == NULL)) {
2551                 /* W2K traverse DACL set - ignore. */
2552                 return True;
2553         }
2554
2555         /*
2556          * Go through the canon_ace list and merge entries
2557          * belonging to identical users of identical allow or deny type.
2558          * We can do this as all deny entries come first, followed by
2559          * all allow entries (we have mandated this before accepting this acl).
2560          */
2561
2562         print_canon_ace_list( "file ace - before merge", file_ace);
2563         merge_aces( &file_ace, false);
2564
2565         print_canon_ace_list( "dir ace - before merge", dir_ace);
2566         merge_aces( &dir_ace, true);
2567
2568         /*
2569          * NT ACLs are order dependent. Go through the acl lists and
2570          * process DENY entries by masking the allow entries.
2571          */
2572
2573         print_canon_ace_list( "file ace - before deny", file_ace);
2574         process_deny_list(fsp->conn, &file_ace);
2575
2576         print_canon_ace_list( "dir ace - before deny", dir_ace);
2577         process_deny_list(fsp->conn, &dir_ace);
2578
2579         /*
2580          * A well formed POSIX file or default ACL has at least 3 entries, a
2581          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2582          * and optionally a mask entry. Ensure this is the case.
2583          */
2584
2585         print_canon_ace_list( "file ace - before valid", file_ace);
2586
2587         if (!ensure_canon_entry_valid_on_set(fsp->conn, &file_ace, false, fsp->conn->params,
2588                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2589                 free_canon_ace_list(file_ace);
2590                 free_canon_ace_list(dir_ace);
2591                 return False;
2592         }
2593
2594         print_canon_ace_list( "dir ace - before valid", dir_ace);
2595
2596         if (dir_ace && !ensure_canon_entry_valid_on_set(fsp->conn, &dir_ace, true, fsp->conn->params,
2597                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2598                 free_canon_ace_list(file_ace);
2599                 free_canon_ace_list(dir_ace);
2600                 return False;
2601         }
2602
2603         print_canon_ace_list( "file ace - return", file_ace);
2604         print_canon_ace_list( "dir ace - return", dir_ace);
2605
2606         *ppfile_ace = file_ace;
2607         *ppdir_ace = dir_ace;
2608         return True;
2609
2610 }
2611
2612 /******************************************************************************
2613  When returning permissions, try and fit NT display
2614  semantics if possible. Note the the canon_entries here must have been malloced.
2615  The list format should be - first entry = owner, followed by group and other user
2616  entries, last entry = other.
2617
2618  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2619  are not ordered, and match on the most specific entry rather than walking a list,
2620  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2621
2622  Entry 0: owner : deny all except read and write.
2623  Entry 1: owner : allow read and write.
2624  Entry 2: group : deny all except read.
2625  Entry 3: group : allow read.
2626  Entry 4: Everyone : allow read.
2627
2628  But NT cannot display this in their ACL editor !
2629 ********************************************************************************/
2630
2631 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2632 {
2633         canon_ace *l_head = *pp_list_head;
2634         canon_ace *owner_ace = NULL;
2635         canon_ace *other_ace = NULL;
2636         canon_ace *ace = NULL;
2637
2638         for (ace = l_head; ace; ace = ace->next) {
2639                 if (ace->type == SMB_ACL_USER_OBJ)
2640                         owner_ace = ace;
2641                 else if (ace->type == SMB_ACL_OTHER) {
2642                         /* Last ace - this is "other" */
2643                         other_ace = ace;
2644                 }
2645         }
2646
2647         if (!owner_ace || !other_ace) {
2648                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2649                         filename ));
2650                 return;
2651         }
2652
2653         /*
2654          * The POSIX algorithm applies to owner first, and other last,
2655          * so ensure they are arranged in this order.
2656          */
2657
2658         if (owner_ace) {
2659                 DLIST_PROMOTE(l_head, owner_ace);
2660         }
2661
2662         if (other_ace) {
2663                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2664         }
2665
2666         /* We have probably changed the head of the list. */
2667
2668         *pp_list_head = l_head;
2669 }
2670
2671 /****************************************************************************
2672  Create a linked list of canonical ACE entries.
2673 ****************************************************************************/
2674
2675 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2676                                    const char *fname, SMB_ACL_T posix_acl,
2677                                    const SMB_STRUCT_STAT *psbuf,
2678                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2679 {
2680         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2681         canon_ace *l_head = NULL;
2682         canon_ace *ace = NULL;
2683         canon_ace *next_ace = NULL;
2684         int entry_id = SMB_ACL_FIRST_ENTRY;
2685         bool is_default_acl = (the_acl_type == SMB_ACL_TYPE_DEFAULT);
2686         SMB_ACL_ENTRY_T entry;
2687         size_t ace_count;
2688
2689         while ( posix_acl && (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1)) {
2690                 SMB_ACL_TAG_T tagtype;
2691                 SMB_ACL_PERMSET_T permset;
2692                 struct dom_sid sid;
2693                 struct unixid unix_ug;
2694                 enum ace_owner owner_type;
2695
2696                 entry_id = SMB_ACL_NEXT_ENTRY;
2697
2698                 /* Is this a MASK entry ? */
2699                 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
2700                         continue;
2701
2702                 if (sys_acl_get_permset(entry, &permset) == -1)
2703                         continue;
2704
2705                 /* Decide which SID to use based on the ACL type. */
2706                 switch(tagtype) {
2707                         case SMB_ACL_USER_OBJ:
2708                                 /* Get the SID from the owner. */
2709                                 sid_copy(&sid, powner);
2710                                 unix_ug.type = ID_TYPE_UID;
2711                                 unix_ug.id = psbuf->st_ex_uid;
2712                                 owner_type = UID_ACE;
2713                                 break;
2714                         case SMB_ACL_USER:
2715                                 {
2716                                         uid_t *puid = (uid_t *)sys_acl_get_qualifier(entry);
2717                                         if (puid == NULL) {
2718                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2719                                                 continue;
2720                                         }
2721                                         uid_to_sid( &sid, *puid);
2722                                         unix_ug.type = ID_TYPE_UID;
2723                                         unix_ug.id = *puid;
2724                                         owner_type = UID_ACE;
2725                                         break;
2726                                 }
2727                         case SMB_ACL_GROUP_OBJ:
2728                                 /* Get the SID from the owning group. */
2729                                 sid_copy(&sid, pgroup);
2730                                 unix_ug.type = ID_TYPE_GID;
2731                                 unix_ug.id = psbuf->st_ex_gid;
2732                                 owner_type = GID_ACE;
2733                                 break;
2734                         case SMB_ACL_GROUP:
2735                                 {
2736                                         gid_t *pgid = (gid_t *)sys_acl_get_qualifier(entry);
2737                                         if (pgid == NULL) {
2738                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2739                                                 continue;
2740                                         }
2741                                         gid_to_sid( &sid, *pgid);
2742                                         unix_ug.type = ID_TYPE_GID;
2743                                         unix_ug.id = *pgid;
2744                                         owner_type = GID_ACE;
2745                                         break;
2746                                 }
2747                         case SMB_ACL_MASK:
2748                                 acl_mask = convert_permset_to_mode_t(permset);
2749                                 continue; /* Don't count the mask as an entry. */
2750                         case SMB_ACL_OTHER:
2751                                 /* Use the Everyone SID */
2752                                 sid = global_sid_World;
2753                                 unix_ug.type = ID_TYPE_NOT_SPECIFIED;
2754                                 unix_ug.id = -1;
2755                                 owner_type = WORLD_ACE;
2756                                 break;
2757                         default:
2758                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2759                                 continue;
2760                 }
2761
2762                 /*
2763                  * Add this entry to the list.
2764                  */
2765
2766                 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2767                         goto fail;
2768
2769                 ZERO_STRUCTP(ace);
2770                 ace->type = tagtype;
2771                 ace->perms = convert_permset_to_mode_t(permset);
2772                 ace->attr = ALLOW_ACE;
2773                 ace->trustee = sid;
2774                 ace->unix_ug = unix_ug;
2775                 ace->owner_type = owner_type;
2776                 ace->ace_flags = get_pai_flags(pal, ace, is_default_acl);
2777
2778                 DLIST_ADD(l_head, ace);
2779         }
2780
2781         /*
2782          * This next call will ensure we have at least a user/group/world set.
2783          */
2784
2785         if (!ensure_canon_entry_valid_on_get(conn, &l_head,
2786                                       powner, pgroup,
2787                                       psbuf))
2788                 goto fail;
2789
2790         /*
2791          * Now go through the list, masking the permissions with the
2792          * acl_mask. Ensure all DENY Entries are at the start of the list.
2793          */
2794
2795         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", is_default_acl ?  "Default" : "Access"));
2796
2797         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2798                 next_ace = ace->next;
2799
2800                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2801                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2802                         ace->perms &= acl_mask;
2803
2804                 if (ace->perms == 0) {
2805                         DLIST_PROMOTE(l_head, ace);
2806                 }
2807
2808                 if( DEBUGLVL( 10 ) ) {
2809                         print_canon_ace(ace, ace_count);
2810                 }
2811         }
2812
2813         arrange_posix_perms(fname,&l_head );
2814
2815         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2816
2817         return l_head;
2818
2819   fail:
2820
2821         free_canon_ace_list(l_head);
2822         return NULL;
2823 }
2824
2825 /****************************************************************************
2826  Check if the current user group list contains a given group.
2827 ****************************************************************************/
2828
2829 bool current_user_in_group(connection_struct *conn, gid_t gid)
2830 {
2831         int i;
2832         const struct security_unix_token *utok = get_current_utok(conn);
2833
2834         for (i = 0; i < utok->ngroups; i++) {
2835                 if (utok->groups[i] == gid) {
2836                         return True;
2837                 }
2838         }
2839
2840         return False;
2841 }
2842
2843 /****************************************************************************
2844  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2845 ****************************************************************************/
2846
2847 static bool acl_group_override(connection_struct *conn,
2848                                const struct smb_filename *smb_fname)
2849 {
2850         if ((errno != EPERM) && (errno != EACCES)) {
2851                 return false;
2852         }
2853
2854         /* file primary group == user primary or supplementary group */
2855         if (lp_acl_group_control(SNUM(conn)) &&
2856             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2857                 return true;
2858         }
2859
2860         /* user has writeable permission */
2861         if (lp_dos_filemode(SNUM(conn)) &&
2862             can_write_to_file(conn, smb_fname)) {
2863                 return true;
2864         }
2865
2866         return false;
2867 }
2868
2869 /****************************************************************************
2870  Attempt to apply an ACL to a file or directory.
2871 ****************************************************************************/
2872
2873 static bool set_canon_ace_list(files_struct *fsp,
2874                                 canon_ace *the_ace,
2875                                 bool default_ace,
2876                                 const SMB_STRUCT_STAT *psbuf,
2877                                 bool *pacl_set_support)
2878 {
2879         connection_struct *conn = fsp->conn;
2880         bool ret = False;
2881         SMB_ACL_T the_acl = sys_acl_init(talloc_tos());
2882         canon_ace *p_ace;
2883         int i;
2884         SMB_ACL_ENTRY_T mask_entry;
2885         bool got_mask_entry = False;
2886         SMB_ACL_PERMSET_T mask_permset;
2887         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2888         bool needs_mask = False;
2889         mode_t mask_perms = 0;
2890
2891         /* Use the psbuf that was passed in. */
2892         if (psbuf != &fsp->fsp_name->st) {
2893                 fsp->fsp_name->st = *psbuf;
2894         }
2895
2896 #if defined(POSIX_ACL_NEEDS_MASK)
2897         /* HP-UX always wants to have a mask (called "class" there). */
2898         needs_mask = True;
2899 #endif
2900
2901         if (the_acl == NULL) {
2902                 DEBUG(0, ("sys_acl_init failed to allocate an ACL\n"));
2903                 return false;
2904         }
2905
2906         if( DEBUGLVL( 10 )) {
2907                 dbgtext("set_canon_ace_list: setting ACL:\n");
2908                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2909                         print_canon_ace( p_ace, i);
2910                 }
2911         }
2912
2913         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2914                 SMB_ACL_ENTRY_T the_entry;
2915                 SMB_ACL_PERMSET_T the_permset;
2916
2917                 /*
2918                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2919                  * named group entries. But if there is an ACL_MASK entry, it applies
2920                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2921                  * so that it doesn't deny (i.e., mask off) any permissions.
2922                  */
2923
2924                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2925                         needs_mask = True;
2926                         mask_perms |= p_ace->perms;
2927                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2928                         mask_perms |= p_ace->perms;
2929                 }
2930
2931                 /*
2932                  * Get the entry for this ACE.
2933                  */
2934
2935                 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
2936                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2937                                 i, strerror(errno) ));
2938                         goto fail;
2939                 }
2940
2941                 if (p_ace->type == SMB_ACL_MASK) {
2942                         mask_entry = the_entry;
2943                         got_mask_entry = True;
2944                 }
2945
2946                 /*
2947                  * Ok - we now know the ACL calls should be working, don't
2948                  * allow fallback to chmod.
2949                  */
2950
2951                 *pacl_set_support = True;
2952
2953                 /*
2954                  * Initialise the entry from the canon_ace.
2955                  */
2956
2957                 /*
2958                  * First tell the entry what type of ACE this is.
2959                  */
2960
2961                 if (sys_acl_set_tag_type(the_entry, p_ace->type) == -1) {
2962                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2963                                 i, strerror(errno) ));
2964                         goto fail;
2965                 }
2966
2967                 /*
2968                  * Only set the qualifier (user or group id) if the entry is a user
2969                  * or group id ACE.
2970                  */
2971
2972                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2973                         if (sys_acl_set_qualifier(the_entry,(void *)&p_ace->unix_ug.id) == -1) {
2974                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2975                                         i, strerror(errno) ));
2976                                 goto fail;
2977                         }
2978                 }
2979
2980                 /*
2981                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2982                  */
2983
2984                 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
2985                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2986                                 i, strerror(errno) ));
2987                         goto fail;
2988                 }
2989
2990                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2991                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2992                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2993                         goto fail;
2994                 }
2995
2996                 /*
2997                  * ..and apply them to the entry.
2998                  */
2999
3000                 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
3001                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
3002                                 i, strerror(errno) ));
3003                         goto fail;
3004                 }
3005
3006                 if( DEBUGLVL( 10 ))
3007                         print_canon_ace( p_ace, i);
3008
3009         }
3010
3011         if (needs_mask && !got_mask_entry) {
3012                 if (sys_acl_create_entry(&the_acl, &mask_entry) == -1) {
3013                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
3014                         goto fail;
3015                 }
3016
3017                 if (sys_acl_set_tag_type(mask_entry, SMB_ACL_MASK) == -1) {
3018                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
3019                         goto fail;
3020                 }
3021
3022                 if (sys_acl_get_permset(mask_entry, &mask_permset) == -1) {
3023                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
3024                         goto fail;
3025                 }
3026
3027                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
3028                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
3029                         goto fail;
3030                 }
3031
3032                 if (sys_acl_set_permset(mask_entry, mask_permset) == -1) {
3033                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
3034                         goto fail;
3035                 }
3036         }
3037
3038         /*
3039          * Finally apply it to the file or directory.
3040          */
3041
3042         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
3043                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
3044                                              the_acl_type, the_acl) == -1) {
3045                         /*
3046                          * Some systems allow all the above calls and only fail with no ACL support
3047                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3048                          */
3049                         if (no_acl_syscall_error(errno)) {
3050                                 *pacl_set_support = False;
3051                         }
3052
3053                         if (acl_group_override(conn, fsp->fsp_name)) {
3054                                 int sret;
3055
3056                                 DEBUG(5,("set_canon_ace_list: acl group "
3057                                          "control on and current user in file "
3058                                          "%s primary group.\n",
3059                                          fsp_str_dbg(fsp)));
3060
3061                                 become_root();
3062                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
3063                                     fsp->fsp_name->base_name, the_acl_type,
3064                                     the_acl);
3065                                 unbecome_root();
3066                                 if (sret == 0) {
3067                                         ret = True;
3068                                 }
3069                         }
3070
3071                         if (ret == False) {
3072                                 DEBUG(2,("set_canon_ace_list: "
3073                                          "sys_acl_set_file type %s failed for "
3074                                          "file %s (%s).\n",
3075                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
3076                                          "directory default" : "file",
3077                                          fsp_str_dbg(fsp), strerror(errno)));
3078                                 goto fail;
3079                         }
3080                 }
3081         } else {
3082                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, 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_FD(fsp, the_acl);
3101                                 unbecome_root();
3102                                 if (sret == 0) {
3103                                         ret = True;
3104                                 }
3105                         }
3106
3107                         if (ret == False) {
3108                                 DEBUG(2,("set_canon_ace_list: "
3109                                          "sys_acl_set_file failed for file %s "
3110                                          "(%s).\n",
3111                                          fsp_str_dbg(fsp), strerror(errno)));
3112                                 goto fail;
3113                         }
3114                 }
3115         }
3116
3117         ret = True;
3118
3119   fail:
3120
3121         if (the_acl != NULL) {
3122                 TALLOC_FREE(the_acl);
3123         }
3124
3125         return ret;
3126 }
3127
3128 /****************************************************************************
3129
3130 ****************************************************************************/
3131
3132 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
3133 {
3134         SMB_ACL_ENTRY_T entry;
3135
3136         if (!the_acl)
3137                 return NULL;
3138         if (sys_acl_get_entry(the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
3139                 TALLOC_FREE(the_acl);
3140                 return NULL;
3141         }
3142         return the_acl;
3143 }
3144
3145 /****************************************************************************
3146  Convert a canon_ace to a generic 3 element permission - if possible.
3147 ****************************************************************************/
3148
3149 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3150
3151 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3152 {
3153         int snum = SNUM(fsp->conn);
3154         size_t ace_count = count_canon_ace_list(file_ace_list);
3155         canon_ace *ace_p;
3156         canon_ace *owner_ace = NULL;
3157         canon_ace *group_ace = NULL;
3158         canon_ace *other_ace = NULL;
3159         mode_t and_bits;
3160         mode_t or_bits;
3161
3162         if (ace_count != 3) {
3163                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3164                          "entries for file %s to convert to posix perms.\n",
3165                          fsp_str_dbg(fsp)));
3166                 return False;
3167         }
3168
3169         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3170                 if (ace_p->owner_type == UID_ACE)
3171                         owner_ace = ace_p;
3172                 else if (ace_p->owner_type == GID_ACE)
3173                         group_ace = ace_p;
3174                 else if (ace_p->owner_type == WORLD_ACE)
3175                         other_ace = ace_p;
3176         }
3177
3178         if (!owner_ace || !group_ace || !other_ace) {
3179                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3180                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3181                 return False;
3182         }
3183
3184         *posix_perms = (mode_t)0;
3185
3186         *posix_perms |= owner_ace->perms;
3187         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3188         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3189         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3190         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3191         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3192         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3193
3194         /* The owner must have at least read access. */
3195
3196         *posix_perms |= S_IRUSR;
3197         if (fsp->is_directory)
3198                 *posix_perms |= (S_IWUSR|S_IXUSR);
3199
3200         /* If requested apply the masks. */
3201
3202         /* Get the initial bits to apply. */
3203
3204         if (fsp->is_directory) {
3205                 and_bits = lp_dir_mask(snum);
3206                 or_bits = lp_force_dir_mode(snum);
3207         } else {
3208                 and_bits = lp_create_mask(snum);
3209                 or_bits = lp_force_create_mode(snum);
3210         }
3211
3212         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3213
3214         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3215                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3216                   (int)group_ace->perms, (int)other_ace->perms,
3217                   (int)*posix_perms, fsp_str_dbg(fsp)));
3218
3219         return True;
3220 }
3221
3222 /****************************************************************************
3223   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3224   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3225   with CI|OI set so it is inherited and also applies to the directory.
3226   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3227 ****************************************************************************/
3228
3229 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3230 {
3231         size_t i, j;
3232
3233         for (i = 0; i < num_aces; i++) {
3234                 for (j = i+1; j < num_aces; j++) {
3235                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3236                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3237                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3238                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3239
3240                         /* We know the lower number ACE's are file entries. */
3241                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3242                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3243                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3244                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3245                                 (i_inh == j_inh) &&
3246                                 (i_flags_ni == 0) &&
3247                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3248                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3249                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3250                                 /*
3251                                  * W2K wants to have access allowed zero access ACE's
3252                                  * at the end of the list. If the mask is zero, merge
3253                                  * the non-inherited ACE onto the inherited ACE.
3254                                  */
3255
3256                                 if (nt_ace_list[i].access_mask == 0) {
3257                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3258                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3259                                         if (num_aces - i - 1 > 0)
3260                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3261                                                                 sizeof(struct security_ace));
3262
3263                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3264                                                 (unsigned int)i, (unsigned int)j ));
3265                                 } else {
3266                                         /*
3267                                          * These are identical except for the flags.
3268                                          * Merge the inherited ACE onto the non-inherited ACE.
3269                                          */
3270
3271                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3272                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3273                                         if (num_aces - j - 1 > 0)
3274                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3275                                                                 sizeof(struct security_ace));
3276
3277                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3278                                                 (unsigned int)j, (unsigned int)i ));
3279                                 }
3280                                 num_aces--;
3281                                 break;
3282                         }
3283                 }
3284         }
3285
3286         return num_aces;
3287 }
3288
3289 /*
3290  * Add or Replace ACE entry.
3291  * In some cases we need to add a specific ACE for compatibility reasons.
3292  * When doing that we must make sure we are not actually creating a duplicate
3293  * entry. So we need to search whether an ACE entry already exist and eventually
3294  * replacce the access mask, or add a completely new entry if none was found.
3295  *
3296  * This function assumes the array has enough space to add a new entry without
3297  * any reallocation of memory.
3298  */
3299
3300 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3301                                 const struct dom_sid *sid, enum security_ace_type type,
3302                                 uint32_t mask, uint8_t flags)
3303 {
3304         int i;
3305
3306         /* first search for a duplicate */
3307         for (i = 0; i < *num_aces; i++) {
3308                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3309                     (nt_ace_list[i].flags == flags)) break;
3310         }
3311
3312         if (i < *num_aces) { /* found */
3313                 nt_ace_list[i].type = type;
3314                 nt_ace_list[i].access_mask = mask;
3315                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3316                            i, sid_string_dbg(sid), flags));
3317                 return;
3318         }
3319
3320         /* not found, append it */
3321         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3322 }
3323
3324
3325 /****************************************************************************
3326  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3327  the space for the return elements and returns the size needed to return the
3328  security descriptor. This should be the only external function needed for
3329  the UNIX style get ACL.
3330 ****************************************************************************/
3331
3332 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3333                                       const char *name,
3334                                       const SMB_STRUCT_STAT *sbuf,
3335                                       struct pai_val *pal,
3336                                       SMB_ACL_T posix_acl,
3337                                       SMB_ACL_T def_acl,
3338                                       uint32_t security_info,
3339                                       TALLOC_CTX *mem_ctx,
3340                                       struct security_descriptor **ppdesc)
3341 {
3342         struct dom_sid owner_sid;
3343         struct dom_sid group_sid;
3344         size_t sd_size = 0;
3345         struct security_acl *psa = NULL;
3346         size_t num_acls = 0;
3347         size_t num_def_acls = 0;
3348         size_t num_aces = 0;
3349         canon_ace *file_ace = NULL;
3350         canon_ace *dir_ace = NULL;
3351         struct security_ace *nt_ace_list = NULL;
3352         size_t num_profile_acls = 0;
3353         struct dom_sid orig_owner_sid;
3354         struct security_descriptor *psd = NULL;
3355         int i;
3356
3357         /*
3358          * Get the owner, group and world SIDs.
3359          */
3360
3361         create_file_sids(sbuf, &owner_sid, &group_sid);
3362
3363         if (lp_profile_acls(SNUM(conn))) {
3364                 /* For WXP SP1 the owner must be administrators. */
3365                 sid_copy(&orig_owner_sid, &owner_sid);
3366                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3367                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3368                 num_profile_acls = 3;
3369         }
3370
3371         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3372
3373                 /*
3374                  * In the optimum case Creator Owner and Creator Group would be used for
3375                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3376                  * would lead to usability problems under Windows: The Creator entries
3377                  * are only available in browse lists of directories and not for files;
3378                  * additionally the identity of the owning group couldn't be determined.
3379                  * We therefore use those identities only for Default ACLs.
3380                  */
3381
3382                 /* Create the canon_ace lists. */
3383                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3384                                             &owner_sid, &group_sid, pal,
3385                                             SMB_ACL_TYPE_ACCESS);
3386
3387                 /* We must have *some* ACLS. */
3388
3389                 if (count_canon_ace_list(file_ace) == 0) {
3390                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3391                         goto done;
3392                 }
3393
3394                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3395                         dir_ace = canonicalise_acl(conn, name, def_acl,
3396                                                    sbuf,
3397                                                    &global_sid_Creator_Owner,
3398                                                    &global_sid_Creator_Group,
3399                                                    pal, SMB_ACL_TYPE_DEFAULT);
3400                 }
3401
3402                 /*
3403                  * Create the NT ACE list from the canonical ace lists.
3404                  */
3405
3406                 {
3407                         canon_ace *ace;
3408                         enum security_ace_type nt_acl_type;
3409
3410                         num_acls = count_canon_ace_list(file_ace);
3411                         num_def_acls = count_canon_ace_list(dir_ace);
3412
3413                         /* Allocate the ace list. */
3414                         if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3415                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3416                                 goto done;
3417                         }
3418
3419                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3420
3421                         /*
3422                          * Create the NT ACE list from the canonical ace lists.
3423                          */
3424
3425                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3426                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3427                                                 &nt_acl_type,
3428                                                 ace->perms,
3429                                                 S_ISDIR(sbuf->st_ex_mode));
3430                                 init_sec_ace(&nt_ace_list[num_aces++],
3431                                         &ace->trustee,
3432                                         nt_acl_type,
3433                                         acc,
3434                                         ace->ace_flags);
3435                         }
3436
3437                         /* The User must have access to a profile share - even
3438                          * if we can't map the SID. */
3439                         if (lp_profile_acls(SNUM(conn))) {
3440                                 add_or_replace_ace(nt_ace_list, &num_aces,
3441                                                    &global_sid_Builtin_Users,
3442                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3443                                                    FILE_GENERIC_ALL, 0);
3444                         }
3445
3446                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3447                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3448                                                 &nt_acl_type,
3449                                                 ace->perms,
3450                                                 S_ISDIR(sbuf->st_ex_mode));
3451                                 init_sec_ace(&nt_ace_list[num_aces++],
3452                                         &ace->trustee,
3453                                         nt_acl_type,
3454                                         acc,
3455                                         ace->ace_flags |
3456                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3457                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3458                                         SEC_ACE_FLAG_INHERIT_ONLY);
3459                         }
3460
3461                         /* The User must have access to a profile share - even
3462                          * if we can't map the SID. */
3463                         if (lp_profile_acls(SNUM(conn))) {
3464                                 add_or_replace_ace(nt_ace_list, &num_aces,
3465                                                 &global_sid_Builtin_Users,
3466                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3467                                                 FILE_GENERIC_ALL,
3468                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3469                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3470                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3471                         }
3472
3473                         /*
3474                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3475                          * Win2K needs this to get the inheritance correct when replacing ACLs
3476                          * on a directory tree. Based on work by Jim @ IBM.
3477                          */
3478
3479                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3480
3481                         if (lp_profile_acls(SNUM(conn))) {
3482                                 for (i = 0; i < num_aces; i++) {
3483                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3484                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3485                                                                    &orig_owner_sid,
3486                                                                    nt_ace_list[i].type,
3487                                                                    nt_ace_list[i].access_mask,
3488                                                                    nt_ace_list[i].flags);
3489                                                 break;
3490                                         }
3491                                 }
3492                         }
3493                 }
3494
3495                 if (num_aces) {
3496                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3497                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3498                                 goto done;
3499                         }
3500                 }
3501         } /* security_info & SECINFO_DACL */
3502
3503         psd = make_standard_sec_desc(mem_ctx,
3504                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3505                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3506                         psa,
3507                         &sd_size);
3508
3509         if(!psd) {
3510                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3511                 sd_size = 0;
3512                 goto done;
3513         }
3514
3515         /*
3516          * Windows 2000: The DACL_PROTECTED flag in the security
3517          * descriptor marks the ACL as non-inheriting, i.e., no
3518          * ACEs from higher level directories propagate to this
3519          * ACL. In the POSIX ACL model permissions are only
3520          * inherited at file create time, so ACLs never contain
3521          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3522          * flag doesn't seem to bother Windows NT.
3523          * Always set this if map acl inherit is turned off.
3524          */
3525         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3526                 psd->type |= SEC_DESC_DACL_PROTECTED;
3527         } else {
3528                 psd->type |= pal->sd_type;
3529         }
3530
3531         if (psd->dacl) {
3532                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3533         }
3534
3535         *ppdesc = psd;
3536
3537  done:
3538
3539         if (posix_acl) {
3540                 TALLOC_FREE(posix_acl);
3541         }
3542         if (def_acl) {
3543                 TALLOC_FREE(def_acl);
3544         }
3545         free_canon_ace_list(file_ace);
3546         free_canon_ace_list(dir_ace);
3547         free_inherited_info(pal);
3548         TALLOC_FREE(nt_ace_list);
3549
3550         return NT_STATUS_OK;
3551 }
3552
3553 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3554                            TALLOC_CTX *mem_ctx,
3555                            struct security_descriptor **ppdesc)
3556 {
3557         SMB_STRUCT_STAT sbuf;
3558         SMB_ACL_T posix_acl = NULL;
3559         struct pai_val *pal;
3560         TALLOC_CTX *frame = talloc_stackframe();
3561         NTSTATUS status;
3562
3563         *ppdesc = NULL;
3564
3565         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3566                   fsp_str_dbg(fsp)));
3567
3568         /* can it happen that fsp_name == NULL ? */
3569         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3570                 status = posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3571                                           security_info, mem_ctx, ppdesc);
3572                 TALLOC_FREE(frame);
3573                 return status;
3574         }
3575
3576         /* Get the stat struct for the owner info. */
3577         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3578                 TALLOC_FREE(frame);
3579                 return map_nt_error_from_unix(errno);
3580         }
3581
3582         /* Get the ACL from the fd. */
3583         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, frame);
3584
3585         pal = fload_inherited_info(fsp);
3586
3587         status = posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3588                                          &sbuf, pal, posix_acl, NULL,
3589                                          security_info, mem_ctx, ppdesc);
3590         TALLOC_FREE(frame);
3591         return status;
3592 }
3593
3594 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3595                           uint32_t security_info,
3596                           TALLOC_CTX *mem_ctx,
3597                           struct security_descriptor **ppdesc)
3598 {
3599         SMB_ACL_T posix_acl = NULL;
3600         SMB_ACL_T def_acl = NULL;
3601         struct pai_val *pal;
3602         struct smb_filename smb_fname;
3603         int ret;
3604         TALLOC_CTX *frame = talloc_stackframe();
3605         NTSTATUS status;
3606
3607         *ppdesc = NULL;
3608
3609         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3610
3611         ZERO_STRUCT(smb_fname);
3612         smb_fname.base_name = discard_const_p(char, name);
3613
3614         /* Get the stat struct for the owner info. */
3615         if (lp_posix_pathnames()) {
3616                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3617         } else {
3618                 ret = SMB_VFS_STAT(conn, &smb_fname);
3619         }
3620
3621         if (ret == -1) {
3622                 TALLOC_FREE(frame);
3623                 return map_nt_error_from_unix(errno);
3624         }
3625
3626         /* Get the ACL from the path. */
3627         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name,
3628                                              SMB_ACL_TYPE_ACCESS, frame);
3629
3630         /* If it's a directory get the default POSIX ACL. */
3631         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3632                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name,
3633                                                    SMB_ACL_TYPE_DEFAULT, frame);
3634                 def_acl = free_empty_sys_acl(conn, def_acl);
3635         }
3636
3637         pal = load_inherited_info(conn, name);
3638
3639         status = posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3640                                          posix_acl, def_acl, security_info,
3641                                          mem_ctx,
3642                                          ppdesc);
3643         TALLOC_FREE(frame);
3644         return status;
3645 }
3646
3647 /****************************************************************************
3648  Try to chown a file. We will be able to chown it under the following conditions.
3649
3650   1) If we have root privileges, then it will just work.
3651   2) If we have SeRestorePrivilege we can change the user + group to any other user.
3652   3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3653   4) If we have write permission to the file and dos_filemodes is set
3654      then allow chown to the currently authenticated user.
3655 ****************************************************************************/
3656
3657 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3658 {
3659         NTSTATUS status;
3660
3661         if(!CAN_WRITE(fsp->conn)) {
3662                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3663         }
3664
3665         /* Case (1). */
3666         status = vfs_chown_fsp(fsp, uid, gid);
3667         if (NT_STATUS_IS_OK(status)) {
3668                 return status;
3669         }
3670
3671         /* Case (2) / (3) */
3672         if (lp_enable_privileges()) {
3673                 bool has_take_ownership_priv = security_token_has_privilege(
3674                                                 get_current_nttok(fsp->conn),
3675                                                 SEC_PRIV_TAKE_OWNERSHIP);
3676                 bool has_restore_priv = security_token_has_privilege(
3677                                                 get_current_nttok(fsp->conn),
3678                                                 SEC_PRIV_RESTORE);
3679
3680                 if (has_restore_priv) {
3681                         ; /* Case (2) */
3682                 } else if (has_take_ownership_priv) {
3683                         /* Case (3) */
3684                         if (uid == get_current_uid(fsp->conn)) {
3685                                 gid = (gid_t)-1;
3686                         } else {
3687                                 has_take_ownership_priv = false;
3688                         }
3689                 }
3690
3691                 if (has_take_ownership_priv || has_restore_priv) {
3692                         become_root();
3693                         status = vfs_chown_fsp(fsp, uid, gid);
3694                         unbecome_root();
3695                         return status;
3696                 }
3697         }
3698
3699         /* Case (4). */
3700         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3701                 return NT_STATUS_ACCESS_DENIED;
3702         }
3703
3704         /* only allow chown to the current user. This is more secure,
3705            and also copes with the case where the SID in a take ownership ACL is
3706            a local SID on the users workstation
3707         */
3708         if (uid != get_current_uid(fsp->conn)) {
3709                 return NT_STATUS_ACCESS_DENIED;
3710         }
3711
3712         become_root();
3713         /* Keep the current file gid the same. */
3714         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3715         unbecome_root();
3716
3717         return status;
3718 }
3719
3720 #if 0
3721 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3722
3723 /****************************************************************************
3724  Take care of parent ACL inheritance.
3725 ****************************************************************************/
3726
3727 NTSTATUS append_parent_acl(files_struct *fsp,
3728                                 const struct security_descriptor *pcsd,
3729                                 struct security_descriptor **pp_new_sd)
3730 {
3731         struct smb_filename *smb_dname = NULL;
3732         struct security_descriptor *parent_sd = NULL;
3733         files_struct *parent_fsp = NULL;
3734         TALLOC_CTX *mem_ctx = talloc_tos();
3735         char *parent_name = NULL;
3736         struct security_ace *new_ace = NULL;
3737         unsigned int num_aces = pcsd->dacl->num_aces;
3738         NTSTATUS status;
3739         int info;
3740         unsigned int i, j;
3741         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3742         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3743
3744         if (psd == NULL) {
3745                 return NT_STATUS_NO_MEMORY;
3746         }
3747
3748         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3749                             NULL)) {
3750                 return NT_STATUS_NO_MEMORY;
3751         }
3752
3753         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3754                                             &smb_dname);
3755         if (!NT_STATUS_IS_OK(status)) {
3756                 goto fail;
3757         }
3758
3759         status = SMB_VFS_CREATE_FILE(
3760                 fsp->conn,                              /* conn */
3761                 NULL,                                   /* req */
3762                 0,                                      /* root_dir_fid */
3763                 smb_dname,                              /* fname */
3764                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3765                 FILE_SHARE_NONE,                        /* share_access */
3766                 FILE_OPEN,                              /* create_disposition*/
3767                 FILE_DIRECTORY_FILE,                    /* create_options */
3768                 0,                                      /* file_attributes */
3769                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3770                 0,                                      /* allocation_size */
3771                 NULL,                                   /* sd */
3772                 NULL,                                   /* ea_list */
3773                 &parent_fsp,                            /* result */
3774                 &info);                                 /* pinfo */
3775
3776         if (!NT_STATUS_IS_OK(status)) {
3777                 TALLOC_FREE(smb_dname);
3778                 return status;
3779         }
3780
3781         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3782                                     SECINFO_DACL, &parent_sd );
3783
3784         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3785         TALLOC_FREE(smb_dname);
3786
3787         if (!NT_STATUS_IS_OK(status)) {
3788                 return status;
3789         }
3790
3791         /*
3792          * Make room for potentially all the ACLs from
3793          * the parent. We used to add the ugw triple here,
3794          * as we knew we were dealing with POSIX ACLs.
3795          * We no longer need to do so as we can guarentee
3796          * that a default ACL from the parent directory will
3797          * be well formed for POSIX ACLs if it came from a
3798          * POSIX ACL source, and if we're not writing to a
3799          * POSIX ACL sink then we don't care if it's not well
3800          * formed. JRA.
3801          */
3802
3803         num_aces += parent_sd->dacl->num_aces;
3804
3805         if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3806                                         num_aces)) == NULL) {
3807                 return NT_STATUS_NO_MEMORY;
3808         }
3809
3810         /* Start by copying in all the given ACE entries. */
3811         for (i = 0; i < psd->dacl->num_aces; i++) {
3812                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3813         }
3814
3815         /*
3816          * Note that we're ignoring "inherit permissions" here
3817          * as that really only applies to newly created files. JRA.
3818          */
3819
3820         /* Finally append any inherited ACEs. */
3821         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3822                 struct security_ace *se = &parent_sd->dacl->aces[j];
3823
3824                 if (fsp->is_directory) {
3825                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3826                                 /* Doesn't apply to a directory - ignore. */
3827                                 DEBUG(10,("append_parent_acl: directory %s "
3828                                         "ignoring non container "
3829                                         "inherit flags %u on ACE with sid %s "
3830                                         "from parent %s\n",
3831                                         fsp_str_dbg(fsp),
3832                                         (unsigned int)se->flags,
3833                                         sid_string_dbg(&se->trustee),
3834                                         parent_name));
3835                                 continue;
3836                         }
3837                 } else {
3838                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3839                                 /* Doesn't apply to a file - ignore. */
3840                                 DEBUG(10,("append_parent_acl: file %s "
3841                                         "ignoring non object "
3842                                         "inherit flags %u on ACE with sid %s "
3843                                         "from parent %s\n",
3844                                         fsp_str_dbg(fsp),
3845                                         (unsigned int)se->flags,
3846                                         sid_string_dbg(&se->trustee),
3847                                         parent_name));
3848                                 continue;
3849                         }
3850                 }
3851
3852                 if (is_dacl_protected) {
3853                         /* If the DACL is protected it means we must
3854                          * not overwrite an existing ACE entry with the
3855                          * same SID. This is order N^2. Ouch :-(. JRA. */
3856                         unsigned int k;
3857                         for (k = 0; k < psd->dacl->num_aces; k++) {
3858                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3859                                                 &se->trustee)) {
3860                                         break;
3861                                 }
3862                         }
3863                         if (k < psd->dacl->num_aces) {
3864                                 /* SID matched. Ignore. */
3865                                 DEBUG(10,("append_parent_acl: path %s "
3866                                         "ignoring ACE with protected sid %s "
3867                                         "from parent %s\n",
3868                                         fsp_str_dbg(fsp),
3869                                         sid_string_dbg(&se->trustee),
3870                                         parent_name));
3871                                 continue;
3872                         }
3873                 }
3874
3875                 sec_ace_copy(&new_ace[i], se);
3876                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3877                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3878                 }
3879                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3880
3881                 if (fsp->is_directory) {
3882                         /*
3883                          * Strip off any inherit only. It's applied.
3884                          */
3885                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3886                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3887                                 /* No further inheritance. */
3888                                 new_ace[i].flags &=
3889                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3890                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3891                         }
3892                 } else {
3893                         /*
3894                          * Strip off any container or inherit
3895                          * flags, they can't apply to objects.
3896                          */
3897                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3898                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3899                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3900                 }
3901                 i++;
3902
3903                 DEBUG(10,("append_parent_acl: path %s "
3904                         "inheriting ACE with sid %s "
3905                         "from parent %s\n",
3906                         fsp_str_dbg(fsp),
3907                         sid_string_dbg(&se->trustee),
3908                         parent_name));
3909         }
3910
3911         psd->dacl->aces = new_ace;
3912         psd->dacl->num_aces = i;
3913         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3914                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
3915
3916         *pp_new_sd = psd;
3917         return status;
3918 }
3919 #endif
3920
3921 /****************************************************************************
3922  Reply to set a security descriptor on an fsp. security_info_sent is the
3923  description of the following NT ACL.
3924  This should be the only external function needed for the UNIX style set ACL.
3925  We make a copy of psd_orig as internal functions modify the elements inside
3926  it, even though it's a const pointer.
3927 ****************************************************************************/
3928
3929 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3930 {
3931         connection_struct *conn = fsp->conn;
3932         uid_t user = (uid_t)-1;
3933         gid_t grp = (gid_t)-1;
3934         struct dom_sid file_owner_sid;
3935         struct dom_sid file_grp_sid;
3936         canon_ace *file_ace_list = NULL;
3937         canon_ace *dir_ace_list = NULL;
3938         bool acl_perms = False;
3939         mode_t orig_mode = (mode_t)0;
3940         NTSTATUS status;
3941         bool set_acl_as_root = false;
3942         bool acl_set_support = false;
3943         bool ret = false;
3944         struct security_descriptor *psd = NULL;
3945
3946         DEBUG(10,("set_nt_acl: called for file %s\n",
3947                   fsp_str_dbg(fsp)));
3948
3949         if (!CAN_WRITE(conn)) {
3950                 DEBUG(10,("set acl rejected on read-only share\n"));
3951                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3952         }
3953
3954         if (!psd_orig) {
3955                 return NT_STATUS_INVALID_PARAMETER;
3956         }
3957
3958         psd = dup_sec_desc(talloc_tos(), psd_orig);
3959         if (!psd) {
3960                 return NT_STATUS_NO_MEMORY;
3961         }
3962
3963         /*
3964          * Get the current state of the file.
3965          */
3966
3967         status = vfs_stat_fsp(fsp);
3968         if (!NT_STATUS_IS_OK(status)) {
3969                 return status;
3970         }
3971
3972         /* Save the original element we check against. */
3973         orig_mode = fsp->fsp_name->st.st_ex_mode;
3974
3975         /*
3976          * Unpack the user/group/world id's.
3977          */
3978
3979         /* POSIX can't cope with missing owner/group. */
3980         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3981                 security_info_sent &= ~SECINFO_OWNER;
3982         }
3983         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3984                 security_info_sent &= ~SECINFO_GROUP;
3985         }
3986
3987         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3988         if (!NT_STATUS_IS_OK(status)) {
3989                 return status;
3990         }
3991
3992         /*
3993          * Do we need to chown ? If so this must be done first as the incoming
3994          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3995          * Noticed by Simo.
3996          */
3997
3998         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3999             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
4000
4001                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
4002                          fsp_str_dbg(fsp), (unsigned int)user,
4003                          (unsigned int)grp));
4004
4005                 status = try_chown(fsp, user, grp);
4006                 if(!NT_STATUS_IS_OK(status)) {
4007                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
4008                                 "= %s.\n", fsp_str_dbg(fsp),
4009                                 (unsigned int)user,
4010                                 (unsigned int)grp,
4011                                 nt_errstr(status)));
4012                         return status;
4013                 }
4014
4015                 /*
4016                  * Recheck the current state of the file, which may have changed.
4017                  * (suid/sgid bits, for instance)
4018                  */
4019
4020                 status = vfs_stat_fsp(fsp);
4021                 if (!NT_STATUS_IS_OK(status)) {
4022                         return status;
4023                 }
4024
4025                 /* Save the original element we check against. */
4026                 orig_mode = fsp->fsp_name->st.st_ex_mode;
4027
4028                 /* If we successfully chowned, we know we must
4029                  * be able to set the acl, so do it as root.
4030                  */
4031                 set_acl_as_root = true;
4032         }
4033
4034         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
4035
4036         if((security_info_sent & SECINFO_DACL) &&
4037                         (psd->type & SEC_DESC_DACL_PRESENT) &&
4038                         (psd->dacl == NULL)) {
4039                 struct security_ace ace[3];
4040
4041                 /* We can't have NULL DACL in POSIX.
4042                    Use owner/group/Everyone -> full access. */
4043
4044                 init_sec_ace(&ace[0],
4045                                 &file_owner_sid,
4046                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4047                                 GENERIC_ALL_ACCESS,
4048                                 0);
4049                 init_sec_ace(&ace[1],
4050                                 &file_grp_sid,
4051                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4052                                 GENERIC_ALL_ACCESS,
4053                                 0);
4054                 init_sec_ace(&ace[2],
4055                                 &global_sid_World,
4056                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4057                                 GENERIC_ALL_ACCESS,
4058                                 0);
4059                 psd->dacl = make_sec_acl(talloc_tos(),
4060                                         NT4_ACL_REVISION,
4061                                         3,
4062                                         ace);
4063                 if (psd->dacl == NULL) {
4064                         return NT_STATUS_NO_MEMORY;
4065                 }
4066                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
4067         }
4068
4069         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
4070                                      &file_grp_sid, &file_ace_list,
4071                                      &dir_ace_list, security_info_sent, psd);
4072
4073         /* Ignore W2K traverse DACL set. */
4074         if (!file_ace_list && !dir_ace_list) {
4075                 return NT_STATUS_OK;
4076         }
4077
4078         if (!acl_perms) {
4079                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
4080                 free_canon_ace_list(file_ace_list);
4081                 free_canon_ace_list(dir_ace_list);
4082                 return NT_STATUS_ACCESS_DENIED;
4083         }
4084
4085         /*
4086          * Only change security if we got a DACL.
4087          */
4088
4089         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
4090                 free_canon_ace_list(file_ace_list);
4091                 free_canon_ace_list(dir_ace_list);
4092                 return NT_STATUS_OK;
4093         }
4094
4095         /*
4096          * Try using the POSIX ACL set first. Fall back to chmod if
4097          * we have no ACL support on this filesystem.
4098          */
4099
4100         if (acl_perms && file_ace_list) {
4101                 if (set_acl_as_root) {
4102                         become_root();
4103                 }
4104                 ret = set_canon_ace_list(fsp, file_ace_list, false,
4105                                          &fsp->fsp_name->st, &acl_set_support);
4106                 if (set_acl_as_root) {
4107                         unbecome_root();
4108                 }
4109                 if (acl_set_support && ret == false) {
4110                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
4111                                  "%s (%s).\n", fsp_str_dbg(fsp),
4112                                  strerror(errno)));
4113                         free_canon_ace_list(file_ace_list);
4114                         free_canon_ace_list(dir_ace_list);
4115                         return map_nt_error_from_unix(errno);
4116                 }
4117         }
4118
4119         if (acl_perms && acl_set_support && fsp->is_directory) {
4120                 if (dir_ace_list) {
4121                         if (set_acl_as_root) {
4122                                 become_root();
4123                         }
4124                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
4125                                                  &fsp->fsp_name->st,
4126                                                  &acl_set_support);
4127                         if (set_acl_as_root) {
4128                                 unbecome_root();
4129                         }
4130                         if (ret == false) {
4131                                 DEBUG(3,("set_nt_acl: failed to set default "
4132                                          "acl on directory %s (%s).\n",
4133                                          fsp_str_dbg(fsp), strerror(errno)));
4134                                 free_canon_ace_list(file_ace_list);
4135                                 free_canon_ace_list(dir_ace_list);
4136                                 return map_nt_error_from_unix(errno);
4137                         }
4138                 } else {
4139                         int sret = -1;
4140
4141                         /*
4142                          * No default ACL - delete one if it exists.
4143                          */
4144
4145                         if (set_acl_as_root) {
4146                                 become_root();
4147                         }
4148                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4149                             fsp->fsp_name->base_name);
4150                         if (set_acl_as_root) {
4151                                 unbecome_root();
4152                         }
4153                         if (sret == -1) {
4154                                 if (acl_group_override(conn, fsp->fsp_name)) {
4155                                         DEBUG(5,("set_nt_acl: acl group "
4156                                                  "control on and current user "
4157                                                  "in file %s primary group. "
4158                                                  "Override delete_def_acl\n",
4159                                                  fsp_str_dbg(fsp)));
4160
4161                                         become_root();
4162                                         sret =
4163                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4164                                                     conn,
4165                                                     fsp->fsp_name->base_name);
4166                                         unbecome_root();
4167                                 }
4168
4169                                 if (sret == -1) {
4170                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4171                                         free_canon_ace_list(file_ace_list);
4172                                         free_canon_ace_list(dir_ace_list);
4173                                         return map_nt_error_from_unix(errno);
4174                                 }
4175                         }
4176                 }
4177         }
4178
4179         if (acl_set_support) {
4180                 if (set_acl_as_root) {
4181                         become_root();
4182                 }
4183                 store_inheritance_attributes(fsp,
4184                                 file_ace_list,
4185                                 dir_ace_list,
4186                                 psd->type);
4187                 if (set_acl_as_root) {
4188                         unbecome_root();
4189                 }
4190         }
4191
4192         /*
4193          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4194          */
4195
4196         if(!acl_set_support && acl_perms) {
4197                 mode_t posix_perms;
4198
4199                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4200                         free_canon_ace_list(file_ace_list);
4201                         free_canon_ace_list(dir_ace_list);
4202                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4203                                  "posix permissions for file %s.\n",
4204                                  fsp_str_dbg(fsp)));
4205                         return NT_STATUS_ACCESS_DENIED;
4206                 }
4207
4208                 if (orig_mode != posix_perms) {
4209                         int sret = -1;
4210
4211                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4212                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4213
4214                         if (set_acl_as_root) {
4215                                 become_root();
4216                         }
4217                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4218                                              posix_perms);
4219                         if (set_acl_as_root) {
4220                                 unbecome_root();
4221                         }
4222                         if(sret == -1) {
4223                                 if (acl_group_override(conn, fsp->fsp_name)) {
4224                                         DEBUG(5,("set_nt_acl: acl group "
4225                                                  "control on and current user "
4226                                                  "in file %s primary group. "
4227                                                  "Override chmod\n",
4228                                                  fsp_str_dbg(fsp)));
4229
4230                                         become_root();
4231                                         sret = SMB_VFS_CHMOD(conn,
4232                                             fsp->fsp_name->base_name,
4233                                             posix_perms);
4234                                         unbecome_root();
4235                                 }
4236
4237                                 if (sret == -1) {
4238                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4239                                                  "failed. Error = %s.\n",
4240                                                  fsp_str_dbg(fsp),
4241                                                  (unsigned int)posix_perms,
4242                                                  strerror(errno)));
4243                                         free_canon_ace_list(file_ace_list);
4244                                         free_canon_ace_list(dir_ace_list);
4245                                         return map_nt_error_from_unix(errno);
4246                                 }
4247                         }
4248                 }
4249         }
4250
4251         free_canon_ace_list(file_ace_list);
4252         free_canon_ace_list(dir_ace_list);
4253
4254         /* Ensure the stat struct in the fsp is correct. */
4255         status = vfs_stat_fsp(fsp);
4256
4257         return NT_STATUS_OK;
4258 }
4259
4260 /****************************************************************************
4261  Get the actual group bits stored on a file with an ACL. Has no effect if
4262  the file has no ACL. Needed in dosmode code where the stat() will return
4263  the mask bits, not the real group bits, for a file with an ACL.
4264 ****************************************************************************/
4265
4266 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4267 {
4268         int entry_id = SMB_ACL_FIRST_ENTRY;
4269         SMB_ACL_ENTRY_T entry;
4270         SMB_ACL_T posix_acl;
4271         int result = -1;
4272
4273         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4274                                              SMB_ACL_TYPE_ACCESS, talloc_tos());
4275         if (posix_acl == (SMB_ACL_T)NULL)
4276                 return -1;
4277
4278         while (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4279                 SMB_ACL_TAG_T tagtype;
4280                 SMB_ACL_PERMSET_T permset;
4281
4282                 entry_id = SMB_ACL_NEXT_ENTRY;
4283
4284                 if (sys_acl_get_tag_type(entry, &tagtype) ==-1)
4285                         break;
4286
4287                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4288                         if (sys_acl_get_permset(entry, &permset) == -1) {
4289                                 break;
4290                         } else {
4291                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4292                                 *mode |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRGRP : 0);
4293                                 *mode |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4294                                 *mode |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4295                                 result = 0;
4296                                 break;
4297                         }
4298                 }
4299         }
4300         TALLOC_FREE(posix_acl);
4301         return result;
4302 }
4303
4304 /****************************************************************************
4305  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4306  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4307 ****************************************************************************/
4308
4309 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4310 {
4311         int entry_id = SMB_ACL_FIRST_ENTRY;
4312         SMB_ACL_ENTRY_T entry;
4313         int num_entries = 0;
4314
4315         while ( sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4316                 SMB_ACL_TAG_T tagtype;
4317                 SMB_ACL_PERMSET_T permset;
4318                 mode_t perms;
4319
4320                 entry_id = SMB_ACL_NEXT_ENTRY;
4321
4322                 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
4323                         return -1;
4324
4325                 if (sys_acl_get_permset(entry, &permset) == -1)
4326                         return -1;
4327
4328                 num_entries++;
4329
4330                 switch(tagtype) {
4331                         case SMB_ACL_USER_OBJ:
4332                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4333                                 break;
4334                         case SMB_ACL_GROUP_OBJ:
4335                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4336                                 break;
4337                         case SMB_ACL_MASK:
4338                                 /*
4339                                  * FIXME: The ACL_MASK entry permissions should really be set to
4340                                  * the union of the permissions of all ACL_USER,
4341                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4342                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4343                                  */
4344                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4345                                 break;
4346                         case SMB_ACL_OTHER:
4347                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4348                                 break;
4349                         default:
4350                                 continue;
4351                 }
4352
4353                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4354                         return -1;
4355
4356                 if (sys_acl_set_permset(entry, permset) == -1)
4357                         return -1;
4358         }
4359
4360         /*
4361          * If this is a simple 3 element ACL or no elements then it's a standard
4362          * UNIX permission set. Just use chmod...
4363          */
4364
4365         if ((num_entries == 3) || (num_entries == 0))
4366                 return -1;
4367
4368         return 0;
4369 }
4370
4371 /****************************************************************************
4372  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4373  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4374  resulting ACL on TO.  Note that name is in UNIX character set.
4375 ****************************************************************************/
4376
4377 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4378 {
4379         SMB_ACL_T posix_acl = NULL;
4380         int ret = -1;
4381
4382         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from,
4383                                                   SMB_ACL_TYPE_ACCESS,
4384                                                   talloc_tos())) == NULL)
4385                 return -1;
4386
4387         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4388                 goto done;
4389
4390         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4391
4392  done:
4393
4394         TALLOC_FREE(posix_acl);
4395         return ret;
4396 }
4397
4398 /****************************************************************************
4399  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4400  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4401  Note that name is in UNIX character set.
4402 ****************************************************************************/
4403
4404 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4405 {
4406         return copy_access_posix_acl(conn, name, name, mode);
4407 }
4408
4409 /****************************************************************************
4410  Check for an existing default POSIX ACL on a directory.
4411 ****************************************************************************/
4412
4413 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4414 {
4415         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4416                                                      SMB_ACL_TYPE_DEFAULT,
4417                                                      talloc_tos());
4418         bool has_acl = False;
4419         SMB_ACL_ENTRY_T entry;
4420
4421         if (def_acl != NULL && (sys_acl_get_entry(def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4422                 has_acl = True;
4423         }
4424
4425         if (def_acl) {
4426                 TALLOC_FREE(def_acl);
4427         }
4428         return has_acl;
4429 }
4430
4431 /****************************************************************************
4432  If the parent directory has no default ACL but it does have an Access ACL,
4433  inherit this Access ACL to file name.
4434 ****************************************************************************/
4435
4436 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4437                        const char *name, mode_t mode)
4438 {
4439         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4440                 return 0;
4441
4442         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4443 }
4444
4445 /****************************************************************************
4446  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4447  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4448 ****************************************************************************/
4449
4450 int fchmod_acl(files_struct *fsp, mode_t mode)
4451 {
4452         connection_struct *conn = fsp->conn;
4453         SMB_ACL_T posix_acl = NULL;
4454         int ret = -1;
4455
4456         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos())) == NULL)
4457                 return -1;
4458
4459         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4460                 goto done;
4461
4462         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4463
4464   done:
4465
4466         TALLOC_FREE(posix_acl);
4467         return ret;
4468 }
4469
4470 /****************************************************************************
4471  Map from wire type to permset.
4472 ****************************************************************************/
4473
4474 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4475 {
4476         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4477                 return False;
4478         }
4479
4480         if (sys_acl_clear_perms(*p_permset) ==  -1) {
4481                 return False;
4482         }
4483
4484         if (wire_perm & SMB_POSIX_ACL_READ) {
4485                 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1) {
4486                         return False;
4487                 }
4488         }
4489         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4490                 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1) {
4491                         return False;
4492                 }
4493         }
4494         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4495                 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1) {
4496                         return False;
4497                 }
4498         }
4499         return True;
4500 }
4501
4502 /****************************************************************************
4503  Map from wire type to tagtype.
4504 ****************************************************************************/
4505
4506 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4507 {
4508         switch (wire_tt) {
4509                 case SMB_POSIX_ACL_USER_OBJ:
4510                         *p_tt = SMB_ACL_USER_OBJ;
4511                         break;
4512                 case SMB_POSIX_ACL_USER:
4513                         *p_tt = SMB_ACL_USER;
4514                         break;
4515                 case SMB_POSIX_ACL_GROUP_OBJ:
4516                         *p_tt = SMB_ACL_GROUP_OBJ;
4517                         break;
4518                 case SMB_POSIX_ACL_GROUP:
4519                         *p_tt = SMB_ACL_GROUP;
4520                         break;
4521                 case SMB_POSIX_ACL_MASK:
4522                         *p_tt = SMB_ACL_MASK;
4523                         break;
4524                 case SMB_POSIX_ACL_OTHER:
4525                         *p_tt = SMB_ACL_OTHER;
4526                         break;
4527                 default:
4528                         return False;
4529         }
4530         return True;
4531 }
4532
4533 /****************************************************************************
4534  Create a new POSIX acl from wire permissions.
4535  FIXME ! How does the share mask/mode fit into this.... ?
4536 ****************************************************************************/
4537
4538 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn,
4539                                             uint16 num_acls,
4540                                             const char *pdata,
4541                                             TALLOC_CTX *mem_ctx)
4542 {
4543         unsigned int i;
4544         SMB_ACL_T the_acl = sys_acl_init(mem_ctx);
4545
4546         if (the_acl == NULL) {
4547                 return NULL;
4548         }
4549
4550         for (i = 0; i < num_acls; i++) {
4551                 SMB_ACL_ENTRY_T the_entry;
4552                 SMB_ACL_PERMSET_T the_permset;
4553                 SMB_ACL_TAG_T tag_type;
4554
4555                 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
4556                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4557                                 i, strerror(errno) ));
4558                         goto fail;
4559                 }
4560
4561                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4562                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4563                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4564                         goto fail;
4565                 }
4566
4567                 if (sys_acl_set_tag_type(the_entry, tag_type) == -1) {
4568                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4569                                 i, strerror(errno) ));
4570                         goto fail;
4571                 }
4572
4573                 /* Get the permset pointer from the new ACL entry. */
4574                 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
4575                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4576                                 i, strerror(errno) ));
4577                         goto fail;
4578                 }
4579
4580                 /* Map from wire to permissions. */
4581                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4582                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4583                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4584                         goto fail;
4585                 }
4586
4587                 /* Now apply to the new ACL entry. */
4588                 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
4589                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4590                                 i, strerror(errno) ));
4591                         goto fail;
4592                 }
4593
4594                 if (tag_type == SMB_ACL_USER) {
4595                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4596                         uid_t uid = (uid_t)uidval;
4597                         if (sys_acl_set_qualifier(the_entry,(void *)&uid) == -1) {
4598                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4599                                         (unsigned int)uid, i, strerror(errno) ));
4600                                 goto fail;
4601                         }
4602                 }
4603
4604                 if (tag_type == SMB_ACL_GROUP) {
4605                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4606                         gid_t gid = (uid_t)gidval;
4607                         if (sys_acl_set_qualifier(the_entry,(void *)&gid) == -1) {
4608                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4609                                         (unsigned int)gid, i, strerror(errno) ));
4610                                 goto fail;
4611                         }
4612                 }
4613         }
4614
4615         return the_acl;
4616
4617  fail:
4618
4619         if (the_acl != NULL) {
4620                 TALLOC_FREE(the_acl);
4621         }
4622         return NULL;
4623 }
4624
4625 /****************************************************************************
4626  Calls from UNIX extensions - Default POSIX ACL set.
4627  If num_def_acls == 0 and not a directory just return. If it is a directory
4628  and num_def_acls == 0 then remove the default acl. Else set the default acl
4629  on the directory.
4630 ****************************************************************************/
4631
4632 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4633                                 uint16 num_def_acls, const char *pdata)
4634 {
4635         SMB_ACL_T def_acl = NULL;
4636
4637         if (!S_ISDIR(psbuf->st_ex_mode)) {
4638                 if (num_def_acls) {
4639                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4640                         errno = EISDIR;
4641                         return False;
4642                 } else {
4643                         return True;
4644                 }
4645         }
4646
4647         if (!num_def_acls) {
4648                 /* Remove the default ACL. */
4649                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4650                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4651                                 fname, strerror(errno) ));
4652                         return False;
4653                 }
4654                 return True;
4655         }
4656
4657         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls,
4658                                                   pdata,
4659                                                   talloc_tos())) == NULL) {
4660                 return False;
4661         }
4662
4663         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4664                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4665                         fname, strerror(errno) ));
4666                 TALLOC_FREE(def_acl);
4667                 return False;
4668         }
4669
4670         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4671         TALLOC_FREE(def_acl);
4672         return True;
4673 }
4674
4675 /****************************************************************************
4676  Remove an ACL from a file. As we don't have acl_delete_entry() available
4677  we must read the current acl and copy all entries except MASK, USER and GROUP
4678  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4679  removed.
4680  FIXME ! How does the share mask/mode fit into this.... ?
4681 ****************************************************************************/
4682
4683 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4684 {
4685         SMB_ACL_T file_acl = NULL;
4686         int entry_id = SMB_ACL_FIRST_ENTRY;
4687         SMB_ACL_ENTRY_T entry;
4688         bool ret = False;
4689         /* Create a new ACL with only 3 entries, u/g/w. */
4690         SMB_ACL_T new_file_acl = sys_acl_init(talloc_tos());
4691         SMB_ACL_ENTRY_T user_ent = NULL;
4692         SMB_ACL_ENTRY_T group_ent = NULL;
4693         SMB_ACL_ENTRY_T other_ent = NULL;
4694
4695         if (new_file_acl == NULL) {
4696                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4697                 return False;
4698         }
4699
4700         /* Now create the u/g/w entries. */
4701         if (sys_acl_create_entry(&new_file_acl, &user_ent) == -1) {
4702                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4703                         fname, strerror(errno) ));
4704                 goto done;
4705         }
4706         if (sys_acl_set_tag_type(user_ent, SMB_ACL_USER_OBJ) == -1) {
4707                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4708                         fname, strerror(errno) ));
4709                 goto done;
4710         }
4711
4712         if (sys_acl_create_entry(&new_file_acl, &group_ent) == -1) {
4713                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4714                         fname, strerror(errno) ));
4715                 goto done;
4716         }
4717         if (sys_acl_set_tag_type(group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4718                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4719                         fname, strerror(errno) ));
4720                 goto done;
4721         }
4722
4723         if (sys_acl_create_entry(&new_file_acl, &other_ent) == -1) {
4724                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4725                         fname, strerror(errno) ));
4726                 goto done;
4727         }
4728         if (sys_acl_set_tag_type(other_ent, SMB_ACL_OTHER) == -1) {
4729                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4730                         fname, strerror(errno) ));
4731                 goto done;
4732         }
4733
4734         /* Get the current file ACL. */
4735         if (fsp && fsp->fh->fd != -1) {
4736                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos());
4737         } else {
4738                 file_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4739                                                     SMB_ACL_TYPE_ACCESS,
4740                                                     talloc_tos());
4741         }
4742
4743         if (file_acl == NULL) {
4744                 /* This is only returned if an error occurred. Even for a file with
4745                    no acl a u/g/w acl should be returned. */
4746                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4747                         fname, strerror(errno) ));
4748                 goto done;
4749         }
4750
4751         while ( sys_acl_get_entry(file_acl, entry_id, &entry) == 1) {
4752                 SMB_ACL_TAG_T tagtype;
4753                 SMB_ACL_PERMSET_T permset;
4754
4755                 entry_id = SMB_ACL_NEXT_ENTRY;
4756
4757                 if (sys_acl_get_tag_type(entry, &tagtype) == -1) {
4758                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4759                                 fname, strerror(errno) ));
4760                         goto done;
4761                 }
4762
4763                 if (sys_acl_get_permset(entry, &permset) == -1) {
4764                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4765                                 fname, strerror(errno) ));
4766                         goto done;
4767                 }
4768
4769                 if (tagtype == SMB_ACL_USER_OBJ) {
4770                         if (sys_acl_set_permset(user_ent, permset) == -1) {
4771                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4772                                         fname, strerror(errno) ));
4773                         }
4774                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4775                         if (sys_acl_set_permset(group_ent, permset) == -1) {
4776                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4777                                         fname, strerror(errno) ));
4778                         }
4779                 } else if (tagtype == SMB_ACL_OTHER) {
4780                         if (sys_acl_set_permset(other_ent, permset) == -1) {
4781                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4782                                         fname, strerror(errno) ));
4783                         }
4784                 }
4785         }
4786
4787         /* Set the new empty file ACL. */
4788         if (fsp && fsp->fh->fd != -1) {
4789                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4790                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4791                                 fname, strerror(errno) ));
4792                         goto done;
4793                 }
4794         } else {
4795                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4796                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4797                                 fname, strerror(errno) ));
4798                         goto done;
4799                 }
4800         }
4801
4802         ret = True;
4803
4804  done:
4805
4806         if (file_acl) {
4807                 TALLOC_FREE(file_acl);
4808         }
4809         if (new_file_acl) {
4810                 TALLOC_FREE(new_file_acl);
4811         }
4812         return ret;
4813 }
4814
4815 /****************************************************************************
4816  Calls from UNIX extensions - POSIX ACL set.
4817  If num_def_acls == 0 then read/modify/write acl after removing all entries
4818  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4819 ****************************************************************************/
4820
4821 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4822 {
4823         SMB_ACL_T file_acl = NULL;
4824
4825         if (!num_acls) {
4826                 /* Remove the ACL from the file. */
4827                 return remove_posix_acl(conn, fsp, fname);
4828         }
4829
4830         if ((file_acl = create_posix_acl_from_wire(conn, num_acls,
4831                                                    pdata,
4832                                                    talloc_tos())) == NULL) {
4833                 return False;
4834         }
4835
4836         if (fsp && fsp->fh->fd != -1) {
4837                 /* The preferred way - use an open fd. */
4838                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4839                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4840                                 fname, strerror(errno) ));
4841                         TALLOC_FREE(file_acl);
4842                         return False;
4843                 }
4844         } else {
4845                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4846                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4847                                 fname, strerror(errno) ));
4848                         TALLOC_FREE(file_acl);
4849                         return False;
4850                 }
4851         }
4852
4853         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4854         TALLOC_FREE(file_acl);
4855         return True;
4856 }
4857
4858 /********************************************************************
4859  Pull the NT ACL from a file on disk or the OpenEventlog() access
4860  check.  Caller is responsible for freeing the returned security
4861  descriptor via TALLOC_FREE().  This is designed for dealing with
4862  user space access checks in smbd outside of the VFS.  For example,
4863  checking access rights in OpenEventlog() or from python.
4864
4865 ********************************************************************/
4866
4867 NTSTATUS get_nt_acl_no_snum(TALLOC_CTX *ctx, const char *fname,
4868                                 uint32 security_info_wanted,
4869                                 struct security_descriptor **sd)
4870 {
4871         TALLOC_CTX *frame = talloc_stackframe();
4872         connection_struct *conn;
4873         NTSTATUS status = NT_STATUS_OK;
4874
4875         if (!posix_locking_init(false)) {
4876                 TALLOC_FREE(frame);
4877                 return NT_STATUS_NO_MEMORY;
4878         }
4879
4880         conn = talloc_zero(frame, connection_struct);
4881         if (conn == NULL) {
4882                 TALLOC_FREE(frame);
4883                 DEBUG(0, ("talloc failed\n"));
4884                 return NT_STATUS_NO_MEMORY;
4885         }
4886
4887         if (!(conn->params = talloc(conn, struct share_params))) {
4888                 DEBUG(0, ("talloc failed\n"));
4889                 TALLOC_FREE(frame);
4890                 return NT_STATUS_NO_MEMORY;
4891         }
4892
4893         conn->params->service = -1;
4894
4895         set_conn_connectpath(conn, "/");
4896
4897         if (!smbd_vfs_init(conn)) {
4898                 DEBUG(0,("smbd_vfs_init() failed!\n"));
4899                 TALLOC_FREE(frame);
4900                 return NT_STATUS_INTERNAL_ERROR;
4901         }
4902
4903         status = SMB_VFS_GET_NT_ACL(conn, fname, security_info_wanted, ctx, sd);
4904         if (!NT_STATUS_IS_OK(status)) {
4905                 DEBUG(0,("set_nt_acl_no_snum: fset_nt_acl returned %s.\n",
4906                         nt_errstr(status)));
4907         }
4908
4909         conn_free(conn);
4910         TALLOC_FREE(frame);
4911
4912         return status;
4913 }
4914
4915 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4916
4917 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4918                                         const char *name,
4919                                         SMB_STRUCT_STAT *psbuf,
4920                                         struct security_descriptor **ppdesc)
4921 {
4922         struct dom_sid owner_sid, group_sid;
4923         size_t size = 0;
4924         struct security_ace aces[4];
4925         uint32_t access_mask = 0;
4926         mode_t mode = psbuf->st_ex_mode;
4927         struct security_acl *new_dacl = NULL;
4928         int idx = 0;
4929
4930         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4931                 name, (int)mode ));
4932
4933         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4934         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4935
4936         /*
4937          We provide up to 4 ACEs
4938                 - Owner
4939                 - Group
4940                 - Everyone
4941                 - NT System
4942         */
4943
4944         if (mode & S_IRUSR) {
4945                 if (mode & S_IWUSR) {
4946                         access_mask |= SEC_RIGHTS_FILE_ALL;
4947                 } else {
4948                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4949                 }
4950         }
4951         if (mode & S_IWUSR) {
4952                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4953         }
4954
4955         init_sec_ace(&aces[idx],
4956                         &owner_sid,
4957                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4958                         access_mask,
4959                         0);
4960         idx++;
4961
4962         access_mask = 0;
4963         if (mode & S_IRGRP) {
4964                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4965         }
4966         if (mode & S_IWGRP) {
4967                 /* note that delete is not granted - this matches posix behaviour */
4968                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4969         }
4970         if (access_mask) {
4971                 init_sec_ace(&aces[idx],
4972                         &group_sid,
4973                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4974                         access_mask,
4975                         0);
4976                 idx++;
4977         }
4978
4979         access_mask = 0;
4980         if (mode & S_IROTH) {
4981                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4982         }
4983         if (mode & S_IWOTH) {
4984                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4985         }
4986         if (access_mask) {
4987                 init_sec_ace(&aces[idx],
4988                         &global_sid_World,
4989                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4990                         access_mask,
4991                         0);
4992                 idx++;
4993         }
4994
4995         init_sec_ace(&aces[idx],
4996                         &global_sid_System,
4997                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4998                         SEC_RIGHTS_FILE_ALL,
4999                         0);
5000         idx++;
5001
5002         new_dacl = make_sec_acl(ctx,
5003                         NT4_ACL_REVISION,
5004                         idx,
5005                         aces);
5006
5007         if (!new_dacl) {
5008                 return NT_STATUS_NO_MEMORY;
5009         }
5010
5011         *ppdesc = make_sec_desc(ctx,
5012                         SECURITY_DESCRIPTOR_REVISION_1,
5013                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
5014                         &owner_sid,
5015                         &group_sid,
5016                         NULL,
5017                         new_dacl,
5018                         &size);
5019         if (!*ppdesc) {
5020                 return NT_STATUS_NO_MEMORY;
5021         }
5022         return NT_STATUS_OK;
5023 }
5024
5025 int posix_sys_acl_blob_get_file(vfs_handle_struct *handle,
5026                                 const char *path_p,
5027                                 TALLOC_CTX *mem_ctx,
5028                                 char **blob_description,
5029                                 DATA_BLOB *blob)
5030 {
5031         int ret;
5032         TALLOC_CTX *frame = talloc_stackframe();
5033         struct smb_acl_wrapper acl_wrapper = {};
5034         struct smb_filename *smb_fname = NULL;
5035         NTSTATUS status = create_synthetic_smb_fname_split(frame, path_p,
5036                                                            NULL,
5037                                                            &smb_fname);
5038         if (!NT_STATUS_IS_OK(status)) {
5039                 errno = map_errno_from_nt_status(status);
5040                 TALLOC_FREE(frame);
5041                 return -1;
5042         }
5043
5044         acl_wrapper.access_acl
5045                 = smb_vfs_call_sys_acl_get_file(handle,
5046                                                 path_p,
5047                                                 SMB_ACL_TYPE_ACCESS,
5048                                                 frame);
5049
5050         ret = smb_vfs_call_stat(handle, smb_fname);
5051         if (ret == -1) {
5052                 TALLOC_FREE(frame);
5053                 return -1;
5054         }
5055
5056         if (S_ISDIR(smb_fname->st.st_ex_mode)) {
5057                 acl_wrapper.default_acl
5058                         = smb_vfs_call_sys_acl_get_file(handle,
5059                                                         path_p,
5060                                                         SMB_ACL_TYPE_DEFAULT,
5061                                                         frame);
5062         }
5063
5064         acl_wrapper.owner = smb_fname->st.st_ex_uid;
5065         acl_wrapper.group = smb_fname->st.st_ex_gid;
5066         acl_wrapper.mode = smb_fname->st.st_ex_mode;
5067
5068         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
5069                                                           &acl_wrapper,
5070                                                           (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
5071                 errno = EINVAL;
5072                 TALLOC_FREE(frame);
5073                 return -1;
5074         }
5075
5076         *blob_description = talloc_strdup(mem_ctx, "posix_acl");
5077         if (!*blob_description) {
5078                 errno = EINVAL;
5079                 TALLOC_FREE(frame);
5080                 return -1;
5081         }
5082
5083         TALLOC_FREE(frame);
5084         return 0;
5085 }
5086
5087 int posix_sys_acl_blob_get_fd(vfs_handle_struct *handle,
5088                               files_struct *fsp,
5089                               TALLOC_CTX *mem_ctx,
5090                               char **blob_description,
5091                               DATA_BLOB *blob)
5092 {
5093         SMB_STRUCT_STAT sbuf;
5094         TALLOC_CTX *frame;
5095         struct smb_acl_wrapper acl_wrapper;
5096         int ret;
5097
5098         /* This ensures that we also consider the default ACL */
5099         if (fsp->is_directory ||  fsp->fh->fd == -1) {
5100                 return posix_sys_acl_blob_get_file(handle, fsp->fsp_name->base_name,
5101                                                    mem_ctx, blob_description, blob);
5102         }
5103         frame = talloc_stackframe();
5104
5105         acl_wrapper.default_acl = NULL;
5106
5107         acl_wrapper.access_acl = smb_vfs_call_sys_acl_get_file(handle, fsp->fsp_name->base_name,
5108                                                                SMB_ACL_TYPE_ACCESS, frame);
5109
5110         ret = smb_vfs_call_fstat(handle, fsp, &sbuf);
5111         if (ret == -1) {
5112                 TALLOC_FREE(frame);
5113                 return -1;
5114         }
5115
5116         acl_wrapper.owner = sbuf.st_ex_uid;
5117         acl_wrapper.group = sbuf.st_ex_gid;
5118         acl_wrapper.mode = sbuf.st_ex_mode;
5119
5120         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
5121                                                           &acl_wrapper,
5122                                                           (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
5123                 errno = EINVAL;
5124                 TALLOC_FREE(frame);
5125                 return -1;
5126         }
5127
5128         *blob_description = talloc_strdup(mem_ctx, "posix_acl");
5129         if (!*blob_description) {
5130                 errno = EINVAL;
5131                 TALLOC_FREE(frame);
5132                 return -1;
5133         }
5134
5135         TALLOC_FREE(frame);
5136         return 0;
5137 }