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