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