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