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(struct connection_struct *conn,
1172                         uid_t *puser, gid_t *pgrp,
1173                         uint32 security_info_sent, const SEC_DESC *psd)
1174 {
1175         DOM_SID owner_sid;
1176         DOM_SID grp_sid;
1177
1178         *puser = (uid_t)-1;
1179         *pgrp = (gid_t)-1;
1180
1181         if(security_info_sent == 0) {
1182                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1183                 return NT_STATUS_OK;
1184         }
1185
1186         /*
1187          * Validate the owner and group SID's.
1188          */
1189
1190         memset(&owner_sid, '\0', sizeof(owner_sid));
1191         memset(&grp_sid, '\0', sizeof(grp_sid));
1192
1193         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1194
1195         /*
1196          * Don't immediately fail if the owner sid cannot be validated.
1197          * This may be a group chown only set.
1198          */
1199
1200         if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1201                 sid_copy(&owner_sid, psd->owner_sid);
1202                 if (!sid_to_uid(&owner_sid, puser)) {
1203                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1204                                 /* this allows take ownership to work
1205                                  * reasonably */
1206                                 *puser = current_user.ut.uid;
1207                         } else {
1208                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1209                                          " owner sid for %s\n",
1210                                          sid_string_dbg(&owner_sid)));
1211                                 return NT_STATUS_INVALID_OWNER;
1212                         }
1213                 }
1214                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1215                          (unsigned int)*puser ));
1216         }
1217
1218         /*
1219          * Don't immediately fail if the group sid cannot be validated.
1220          * This may be an owner chown only set.
1221          */
1222
1223         if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1224                 sid_copy(&grp_sid, psd->group_sid);
1225                 if (!sid_to_gid( &grp_sid, pgrp)) {
1226                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1227                                 /* this allows take group ownership to work
1228                                  * reasonably */
1229                                 *pgrp = current_user.ut.gid;
1230                         } else {
1231                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1232                                          " group sid.\n"));
1233                                 return NT_STATUS_INVALID_OWNER;
1234                         }
1235                 }
1236                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1237                          (unsigned int)*pgrp));
1238         }
1239
1240         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1241
1242         return NT_STATUS_OK;
1243 }
1244
1245 /****************************************************************************
1246  Ensure the enforced permissions for this share apply.
1247 ****************************************************************************/
1248
1249 static void apply_default_perms(const struct share_params *params,
1250                                 const bool is_directory, canon_ace *pace,
1251                                 mode_t type)
1252 {
1253         mode_t and_bits = (mode_t)0;
1254         mode_t or_bits = (mode_t)0;
1255
1256         /* Get the initial bits to apply. */
1257
1258         if (is_directory) {
1259                 and_bits = lp_dir_security_mask(params->service);
1260                 or_bits = lp_force_dir_security_mode(params->service);
1261         } else {
1262                 and_bits = lp_security_mask(params->service);
1263                 or_bits = lp_force_security_mode(params->service);
1264         }
1265
1266         /* Now bounce them into the S_USR space. */
1267         switch(type) {
1268         case S_IRUSR:
1269                 /* Ensure owner has read access. */
1270                 pace->perms |= S_IRUSR;
1271                 if (is_directory)
1272                         pace->perms |= (S_IWUSR|S_IXUSR);
1273                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1274                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1275                 break;
1276         case S_IRGRP:
1277                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1278                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1279                 break;
1280         case S_IROTH:
1281                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1282                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1283                 break;
1284         }
1285
1286         pace->perms = ((pace->perms & and_bits)|or_bits);
1287 }
1288
1289 /****************************************************************************
1290  Check if a given uid/SID is in a group gid/SID. This is probably very
1291  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1292 ****************************************************************************/
1293
1294 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1295 {
1296         const char *u_name = NULL;
1297
1298         /* "Everyone" always matches every uid. */
1299
1300         if (sid_equal(&group_ace->trustee, &global_sid_World))
1301                 return True;
1302
1303         /*
1304          * if it's the current user, we already have the unix token
1305          * and don't need to do the complex user_in_group_sid() call
1306          */
1307         if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1308                 size_t i;
1309
1310                 if (group_ace->unix_ug.gid == current_user.ut.gid) {
1311                         return True;
1312                 }
1313
1314                 for (i=0; i < current_user.ut.ngroups; i++) {
1315                         if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1316                                 return True;
1317                         }
1318                 }
1319         }
1320
1321         /* u_name talloc'ed off tos. */
1322         u_name = uidtoname(uid_ace->unix_ug.uid);
1323         if (!u_name) {
1324                 return False;
1325         }
1326
1327         /*
1328          * user_in_group_sid() uses create_token_from_username()
1329          * which creates an artificial NT token given just a username,
1330          * so this is not reliable for users from foreign domains
1331          * exported by winbindd!
1332          */
1333         return user_in_group_sid(u_name, &group_ace->trustee);
1334 }
1335
1336 /****************************************************************************
1337  A well formed POSIX file or default ACL has at least 3 entries, a
1338  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1339  In addition, the owner must always have at least read access.
1340  When using this call on get_acl, the pst struct is valid and contains
1341  the mode of the file. When using this call on set_acl, the pst struct has
1342  been modified to have a mode containing the default for this file or directory
1343  type.
1344 ****************************************************************************/
1345
1346 static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
1347                                      const struct share_params *params,
1348                                      const bool is_directory,
1349                                                         const DOM_SID *pfile_owner_sid,
1350                                                         const DOM_SID *pfile_grp_sid,
1351                                                         const SMB_STRUCT_STAT *pst,
1352                                                         bool setting_acl)
1353 {
1354         canon_ace *pace;
1355         bool got_user = False;
1356         bool got_grp = False;
1357         bool got_other = False;
1358         canon_ace *pace_other = NULL;
1359
1360         for (pace = *pp_ace; pace; pace = pace->next) {
1361                 if (pace->type == SMB_ACL_USER_OBJ) {
1362
1363                         if (setting_acl)
1364                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1365                         got_user = True;
1366
1367                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1368
1369                         /*
1370                          * Ensure create mask/force create mode is respected on set.
1371                          */
1372
1373                         if (setting_acl)
1374                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1375                         got_grp = True;
1376
1377                 } else if (pace->type == SMB_ACL_OTHER) {
1378
1379                         /*
1380                          * Ensure create mask/force create mode is respected on set.
1381                          */
1382
1383                         if (setting_acl)
1384                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1385                         got_other = True;
1386                         pace_other = pace;
1387                 }
1388         }
1389
1390         if (!got_user) {
1391                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1392                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1393                         return False;
1394                 }
1395
1396                 ZERO_STRUCTP(pace);
1397                 pace->type = SMB_ACL_USER_OBJ;
1398                 pace->owner_type = UID_ACE;
1399                 pace->unix_ug.uid = pst->st_ex_uid;
1400                 pace->trustee = *pfile_owner_sid;
1401                 pace->attr = ALLOW_ACE;
1402
1403                 if (setting_acl) {
1404                         /* See if the owning user is in any of the other groups in
1405                            the ACE. If so, OR in the permissions from that group. */
1406
1407                         bool group_matched = False;
1408                         canon_ace *pace_iter;
1409
1410                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1411                                 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1412                                         if (uid_entry_in_group(conn, pace, pace_iter)) {
1413                                                 pace->perms |= pace_iter->perms;
1414                                                 group_matched = True;
1415                                         }
1416                                 }
1417                         }
1418
1419                         /* If we only got an "everyone" perm, just use that. */
1420                         if (!group_matched) {
1421                                 if (got_other)
1422                                         pace->perms = pace_other->perms;
1423                                 else
1424                                         pace->perms = 0;
1425                         }
1426
1427                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1428                 } else {
1429                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1430                 }
1431
1432                 DLIST_ADD(*pp_ace, pace);
1433         }
1434
1435         if (!got_grp) {
1436                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1437                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1438                         return False;
1439                 }
1440
1441                 ZERO_STRUCTP(pace);
1442                 pace->type = SMB_ACL_GROUP_OBJ;
1443                 pace->owner_type = GID_ACE;
1444                 pace->unix_ug.uid = pst->st_ex_gid;
1445                 pace->trustee = *pfile_grp_sid;
1446                 pace->attr = ALLOW_ACE;
1447                 if (setting_acl) {
1448                         /* If we only got an "everyone" perm, just use that. */
1449                         if (got_other)
1450                                 pace->perms = pace_other->perms;
1451                         else
1452                                 pace->perms = 0;
1453                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1454                 } else {
1455                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1456                 }
1457
1458                 DLIST_ADD(*pp_ace, pace);
1459         }
1460
1461         if (!got_other) {
1462                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1463                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1464                         return False;
1465                 }
1466
1467                 ZERO_STRUCTP(pace);
1468                 pace->type = SMB_ACL_OTHER;
1469                 pace->owner_type = WORLD_ACE;
1470                 pace->unix_ug.world = -1;
1471                 pace->trustee = global_sid_World;
1472                 pace->attr = ALLOW_ACE;
1473                 if (setting_acl) {
1474                         pace->perms = 0;
1475                         apply_default_perms(params, is_directory, pace, S_IROTH);
1476                 } else
1477                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1478
1479                 DLIST_ADD(*pp_ace, pace);
1480         }
1481
1482         return True;
1483 }
1484
1485 /****************************************************************************
1486  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1487  If it does not have them, check if there are any entries where the trustee is the
1488  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1489 ****************************************************************************/
1490
1491 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1492 {
1493         bool got_user_obj, got_group_obj;
1494         canon_ace *current_ace;
1495         int i, entries;
1496
1497         entries = count_canon_ace_list(ace);
1498         got_user_obj = False;
1499         got_group_obj = False;
1500
1501         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1502                 if (current_ace->type == SMB_ACL_USER_OBJ)
1503                         got_user_obj = True;
1504                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1505                         got_group_obj = True;
1506         }
1507         if (got_user_obj && got_group_obj) {
1508                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1509                 return;
1510         }
1511
1512         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1513                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1514                                 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1515                         current_ace->type = SMB_ACL_USER_OBJ;
1516                         got_user_obj = True;
1517                 }
1518                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1519                                 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1520                         current_ace->type = SMB_ACL_GROUP_OBJ;
1521                         got_group_obj = True;
1522                 }
1523         }
1524         if (!got_user_obj)
1525                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1526         if (!got_group_obj)
1527                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1528 }
1529
1530 /****************************************************************************
1531  If an ACE entry is SMB_ACL_USER_OBJ and not CREATOR_OWNER, map to SMB_ACL_USER.
1532  If an ACE entry is SMB_ACL_GROUP_OBJ and not CREATOR_GROUP, map to SMB_ACL_GROUP
1533 ****************************************************************************/
1534
1535 static bool dup_owning_ace(canon_ace *dir_ace, canon_ace *ace)
1536 {
1537         /* dir ace must be followings.
1538            SMB_ACL_USER_OBJ : trustee(CREATOR_OWNER) -> Posix ACL d:u::perm
1539            SMB_ACL_USER     : not trustee    -> Posix ACL u:user:perm
1540            SMB_ACL_USER_OBJ : trustee -> convert to SMB_ACL_USER : trustee
1541            Posix ACL u:trustee:perm
1542
1543            SMB_ACL_GROUP_OBJ: trustee(CREATOR_GROUP) -> Posix ACL d:g::perm
1544            SMB_ACL_GROUP    : not trustee   -> Posix ACL g:group:perm
1545            SMB_ACL_GROUP_OBJ: trustee -> convert to SMB_ACL_GROUP : trustee
1546            Posix ACL g:trustee:perm
1547         */
1548
1549         if (ace->type == SMB_ACL_USER_OBJ &&
1550                         !(sid_equal(&ace->trustee, &global_sid_Creator_Owner))) {
1551                 canon_ace *dup_ace = dup_canon_ace(ace);
1552
1553                 if (dup_ace == NULL) {
1554                         return false;
1555                 }
1556                 dup_ace->type = SMB_ACL_USER;
1557                 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1558         }
1559
1560         if (ace->type == SMB_ACL_GROUP_OBJ &&
1561                         !(sid_equal(&ace->trustee, &global_sid_Creator_Group))) {
1562                 canon_ace *dup_ace = dup_canon_ace(ace);
1563
1564                 if (dup_ace == NULL) {
1565                         return false;
1566                 }
1567                 dup_ace->type = SMB_ACL_GROUP;
1568                 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1569         }
1570
1571         return true;
1572 }
1573
1574 /****************************************************************************
1575  Unpack a SEC_DESC into two canonical ace lists.
1576 ****************************************************************************/
1577
1578 static bool create_canon_ace_lists(files_struct *fsp,
1579                                         const SMB_STRUCT_STAT *pst,
1580                                         DOM_SID *pfile_owner_sid,
1581                                         DOM_SID *pfile_grp_sid,
1582                                         canon_ace **ppfile_ace,
1583                                         canon_ace **ppdir_ace,
1584                                         const SEC_ACL *dacl)
1585 {
1586         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1587         canon_ace *file_ace = NULL;
1588         canon_ace *dir_ace = NULL;
1589         canon_ace *current_ace = NULL;
1590         bool got_dir_allow = False;
1591         bool got_file_allow = False;
1592         int i, j;
1593
1594         *ppfile_ace = NULL;
1595         *ppdir_ace = NULL;
1596
1597         /*
1598          * Convert the incoming ACL into a more regular form.
1599          */
1600
1601         for(i = 0; i < dacl->num_aces; i++) {
1602                 SEC_ACE *psa = &dacl->aces[i];
1603
1604                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1605                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1606                         return False;
1607                 }
1608
1609                 if (nt4_compatible_acls()) {
1610                         /*
1611                          * The security mask may be UNIX_ACCESS_NONE which should map into
1612                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1613                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1614                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1615                          */
1616
1617                         /*
1618                          * Convert GENERIC bits to specific bits.
1619                          */
1620
1621                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1622
1623                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1624
1625                         if(psa->access_mask != UNIX_ACCESS_NONE)
1626                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1627                 }
1628         }
1629
1630         /*
1631          * Deal with the fact that NT 4.x re-writes the canonical format
1632          * that we return for default ACLs. If a directory ACE is identical
1633          * to a inherited directory ACE then NT changes the bits so that the
1634          * first ACE is set to OI|IO and the second ACE for this SID is set
1635          * to CI. We need to repair this. JRA.
1636          */
1637
1638         for(i = 0; i < dacl->num_aces; i++) {
1639                 SEC_ACE *psa1 = &dacl->aces[i];
1640
1641                 for (j = i + 1; j < dacl->num_aces; j++) {
1642                         SEC_ACE *psa2 = &dacl->aces[j];
1643
1644                         if (psa1->access_mask != psa2->access_mask)
1645                                 continue;
1646
1647                         if (!sid_equal(&psa1->trustee, &psa2->trustee))
1648                                 continue;
1649
1650                         /*
1651                          * Ok - permission bits and SIDs are equal.
1652                          * Check if flags were re-written.
1653                          */
1654
1655                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1656
1657                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1658                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1659
1660                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1661
1662                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1663                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1664
1665                         }
1666                 }
1667         }
1668
1669         for(i = 0; i < dacl->num_aces; i++) {
1670                 SEC_ACE *psa = &dacl->aces[i];
1671
1672                 /*
1673                  * Create a cannon_ace entry representing this NT DACL ACE.
1674                  */
1675
1676                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1677                         free_canon_ace_list(file_ace);
1678                         free_canon_ace_list(dir_ace);
1679                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1680                         return False;
1681                 }
1682
1683                 ZERO_STRUCTP(current_ace);
1684
1685                 sid_copy(&current_ace->trustee, &psa->trustee);
1686
1687                 /*
1688                  * Try and work out if the SID is a user or group
1689                  * as we need to flag these differently for POSIX.
1690                  * Note what kind of a POSIX ACL this should map to.
1691                  */
1692
1693                 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1694                         current_ace->owner_type = WORLD_ACE;
1695                         current_ace->unix_ug.world = -1;
1696                         current_ace->type = SMB_ACL_OTHER;
1697                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1698                         current_ace->owner_type = UID_ACE;
1699                         current_ace->unix_ug.uid = pst->st_ex_uid;
1700                         current_ace->type = SMB_ACL_USER_OBJ;
1701
1702                         /*
1703                          * The Creator Owner entry only specifies inheritable permissions,
1704                          * never access permissions. WinNT doesn't always set the ACE to
1705                          * INHERIT_ONLY, though.
1706                          */
1707
1708                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1709
1710                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1711                         current_ace->owner_type = GID_ACE;
1712                         current_ace->unix_ug.gid = pst->st_ex_gid;
1713                         current_ace->type = SMB_ACL_GROUP_OBJ;
1714
1715                         /*
1716                          * The Creator Group entry only specifies inheritable permissions,
1717                          * never access permissions. WinNT doesn't always set the ACE to
1718                          * INHERIT_ONLY, though.
1719                          */
1720                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1721
1722                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1723                         current_ace->owner_type = UID_ACE;
1724                         /* If it's the owning user, this is a user_obj, not
1725                          * a user. */
1726                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1727                                 current_ace->type = SMB_ACL_USER_OBJ;
1728                         } else {
1729                                 current_ace->type = SMB_ACL_USER;
1730                         }
1731                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1732                         current_ace->owner_type = GID_ACE;
1733                         /* If it's the primary group, this is a group_obj, not
1734                          * a group. */
1735                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1736                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1737                         } else {
1738                                 current_ace->type = SMB_ACL_GROUP;
1739                         }
1740                 } else {
1741                         /*
1742                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1743                          */
1744
1745                         if (non_mappable_sid(&psa->trustee)) {
1746                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1747                                            "non-mappable SID %s\n",
1748                                            sid_string_dbg(&psa->trustee)));
1749                                 SAFE_FREE(current_ace);
1750                                 continue;
1751                         }
1752
1753                         free_canon_ace_list(file_ace);
1754                         free_canon_ace_list(dir_ace);
1755                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1756                                   "%s to uid or gid.\n",
1757                                   sid_string_dbg(&current_ace->trustee)));
1758                         SAFE_FREE(current_ace);
1759                         return False;
1760                 }
1761
1762                 /*
1763                  * Map the given NT permissions into a UNIX mode_t containing only
1764                  * S_I(R|W|X)USR bits.
1765                  */
1766
1767                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1768                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1769
1770                 /* Store the ace_flag. */
1771                 current_ace->ace_flags = psa->flags;
1772
1773                 /*
1774                  * Now add the created ace to either the file list, the directory
1775                  * list, or both. We *MUST* preserve the order here (hence we use
1776                  * DLIST_ADD_END) as NT ACLs are order dependent.
1777                  */
1778
1779                 if (fsp->is_directory) {
1780
1781                         /*
1782                          * We can only add to the default POSIX ACE list if the ACE is
1783                          * designed to be inherited by both files and directories.
1784                          */
1785
1786                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1787                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1788
1789                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1790
1791                                 /*
1792                                  * Note if this was an allow ace. We can't process
1793                                  * any further deny ace's after this.
1794                                  */
1795
1796                                 if (current_ace->attr == ALLOW_ACE)
1797                                         got_dir_allow = True;
1798
1799                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1800                                         DEBUG(0,("create_canon_ace_lists: "
1801                                                  "malformed ACL in "
1802                                                  "inheritable ACL! Deny entry "
1803                                                  "after Allow entry. Failing "
1804                                                  "to set on file %s.\n",
1805                                                  fsp_str_dbg(fsp)));
1806                                         free_canon_ace_list(file_ace);
1807                                         free_canon_ace_list(dir_ace);
1808                                         return False;
1809                                 }
1810
1811                                 if( DEBUGLVL( 10 )) {
1812                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1813                                         print_canon_ace( current_ace, 0);
1814                                 }
1815
1816                                 /*
1817                                  * We have a lossy mapping: directory ACE entries
1818                                  * CREATOR_OWNER ------\
1819                                  *     (map to)         +---> SMB_ACL_USER_OBJ
1820                                  * owning sid    ------/
1821                                  *
1822                                  * CREATOR_GROUP ------\
1823                                  *     (map to)         +---> SMB_ACL_GROUP_OBJ
1824                                  * primary group sid --/
1825                                  *
1826                                  * on set. And on read of a directory ACL
1827                                  *
1828                                  * SMB_ACL_USER_OBJ ----> CREATOR_OWNER
1829                                  * SMB_ACL_GROUP_OBJ ---> CREATOR_GROUP.
1830                                  *
1831                                  * Deal with this on set by duplicating
1832                                  * owning sid and primary group sid ACE
1833                                  * entries into the directory ACL.
1834                                  * Fix from Tsukasa Hamano <hamano@osstech.co.jp>.
1835                                  */
1836
1837                                 if (!dup_owning_ace(dir_ace, current_ace)) {
1838                                         DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1839                                         free_canon_ace_list(file_ace);
1840                                         free_canon_ace_list(dir_ace);
1841                                         return false;
1842                                 }
1843
1844                                 /*
1845                                  * If this is not an inherit only ACE we need to add a duplicate
1846                                  * to the file acl.
1847                                  */
1848
1849                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1850                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1851
1852                                         if (!dup_ace) {
1853                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1854                                                 free_canon_ace_list(file_ace);
1855                                                 free_canon_ace_list(dir_ace);
1856                                                 return False;
1857                                         }
1858
1859                                         /*
1860                                          * We must not free current_ace here as its
1861                                          * pointer is now owned by the dir_ace list.
1862                                          */
1863                                         current_ace = dup_ace;
1864                                         /* We've essentially split this ace into two,
1865                                          * and added the ace with inheritance request
1866                                          * bits to the directory ACL. Drop those bits for
1867                                          * the ACE we're adding to the file list. */
1868                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1869                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1870                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1871                                 } else {
1872                                         /*
1873                                          * We must not free current_ace here as its
1874                                          * pointer is now owned by the dir_ace list.
1875                                          */
1876                                         current_ace = NULL;
1877                                 }
1878                         }
1879                 }
1880
1881                 /*
1882                  * Only add to the file ACL if not inherit only.
1883                  */
1884
1885                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1886                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1887
1888                         /*
1889                          * Note if this was an allow ace. We can't process
1890                          * any further deny ace's after this.
1891                          */
1892
1893                         if (current_ace->attr == ALLOW_ACE)
1894                                 got_file_allow = True;
1895
1896                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1897                                 DEBUG(0,("create_canon_ace_lists: malformed "
1898                                          "ACL in file ACL ! Deny entry after "
1899                                          "Allow entry. Failing to set on file "
1900                                          "%s.\n", fsp_str_dbg(fsp)));
1901                                 free_canon_ace_list(file_ace);
1902                                 free_canon_ace_list(dir_ace);
1903                                 return False;
1904                         }
1905
1906                         if( DEBUGLVL( 10 )) {
1907                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1908                                 print_canon_ace( current_ace, 0);
1909                         }
1910                         all_aces_are_inherit_only = False;
1911                         /*
1912                          * We must not free current_ace here as its
1913                          * pointer is now owned by the file_ace list.
1914                          */
1915                         current_ace = NULL;
1916                 }
1917
1918                 /*
1919                  * Free if ACE was not added.
1920                  */
1921
1922                 SAFE_FREE(current_ace);
1923         }
1924
1925         if (fsp->is_directory && all_aces_are_inherit_only) {
1926                 /*
1927                  * Windows 2000 is doing one of these weird 'inherit acl'
1928                  * traverses to conserve NTFS ACL resources. Just pretend
1929                  * there was no DACL sent. JRA.
1930                  */
1931
1932                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1933                 free_canon_ace_list(file_ace);
1934                 free_canon_ace_list(dir_ace);
1935                 file_ace = NULL;
1936                 dir_ace = NULL;
1937         } else {
1938                 /*
1939                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1940                  * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1941                  * entries can be converted to *_OBJ. Usually we will already have these
1942                  * entries in the Default ACL, and the Access ACL will not have them.
1943                  */
1944                 if (file_ace) {
1945                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1946                 }
1947                 if (dir_ace) {
1948                         check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1949                 }
1950         }
1951
1952         *ppfile_ace = file_ace;
1953         *ppdir_ace = dir_ace;
1954
1955         return True;
1956 }
1957
1958 /****************************************************************************
1959  ASCII art time again... JRA :-).
1960
1961  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1962  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1963  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1964  allow or deny have been merged, so the same SID can only appear once in the deny
1965  list or once in the allow list.
1966
1967  We then process as follows :
1968
1969  ---------------------------------------------------------------------------
1970  First pass - look for a Everyone DENY entry.
1971
1972  If it is deny all (rwx) trunate the list at this point.
1973  Else, walk the list from this point and use the deny permissions of this
1974  entry as a mask on all following allow entries. Finally, delete
1975  the Everyone DENY entry (we have applied it to everything possible).
1976
1977  In addition, in this pass we remove any DENY entries that have
1978  no permissions (ie. they are a DENY nothing).
1979  ---------------------------------------------------------------------------
1980  Second pass - only deal with deny user entries.
1981
1982  DENY user1 (perms XXX)
1983
1984  new_perms = 0
1985  for all following allow group entries where user1 is in group
1986         new_perms |= group_perms;
1987
1988  user1 entry perms = new_perms & ~ XXX;
1989
1990  Convert the deny entry to an allow entry with the new perms and
1991  push to the end of the list. Note if the user was in no groups
1992  this maps to a specific allow nothing entry for this user.
1993
1994  The common case from the NT ACL choser (userX deny all) is
1995  optimised so we don't do the group lookup - we just map to
1996  an allow nothing entry.
1997
1998  What we're doing here is inferring the allow permissions the
1999  person setting the ACE on user1 wanted by looking at the allow
2000  permissions on the groups the user is currently in. This will
2001  be a snapshot, depending on group membership but is the best
2002  we can do and has the advantage of failing closed rather than
2003  open.
2004  ---------------------------------------------------------------------------
2005  Third pass - only deal with deny group entries.
2006
2007  DENY group1 (perms XXX)
2008
2009  for all following allow user entries where user is in group1
2010    user entry perms = user entry perms & ~ XXX;
2011
2012  If there is a group Everyone allow entry with permissions YYY,
2013  convert the group1 entry to an allow entry and modify its
2014  permissions to be :
2015
2016  new_perms = YYY & ~ XXX
2017
2018  and push to the end of the list.
2019
2020  If there is no group Everyone allow entry then convert the
2021  group1 entry to a allow nothing entry and push to the end of the list.
2022
2023  Note that the common case from the NT ACL choser (groupX deny all)
2024  cannot be optimised here as we need to modify user entries who are
2025  in the group to change them to a deny all also.
2026
2027  What we're doing here is modifying the allow permissions of
2028  user entries (which are more specific in POSIX ACLs) to mask
2029  out the explicit deny set on the group they are in. This will
2030  be a snapshot depending on current group membership but is the
2031  best we can do and has the advantage of failing closed rather
2032  than open.
2033  ---------------------------------------------------------------------------
2034  Fourth pass - cope with cumulative permissions.
2035
2036  for all allow user entries, if there exists an allow group entry with
2037  more permissive permissions, and the user is in that group, rewrite the
2038  allow user permissions to contain both sets of permissions.
2039
2040  Currently the code for this is #ifdef'ed out as these semantics make
2041  no sense to me. JRA.
2042  ---------------------------------------------------------------------------
2043
2044  Note we *MUST* do the deny user pass first as this will convert deny user
2045  entries into allow user entries which can then be processed by the deny
2046  group pass.
2047
2048  The above algorithm took a *lot* of thinking about - hence this
2049  explaination :-). JRA.
2050 ****************************************************************************/
2051
2052 /****************************************************************************
2053  Process a canon_ace list entries. This is very complex code. We need
2054  to go through and remove the "deny" permissions from any allow entry that matches
2055  the id of this entry. We have already refused any NT ACL that wasn't in correct
2056  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2057  we just remove it (to fail safe). We have already removed any duplicate ace
2058  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2059  allow entries.
2060 ****************************************************************************/
2061
2062 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2063 {
2064         canon_ace *ace_list = *pp_ace_list;
2065         canon_ace *curr_ace = NULL;
2066         canon_ace *curr_ace_next = NULL;
2067
2068         /* Pass 1 above - look for an Everyone, deny entry. */
2069
2070         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2071                 canon_ace *allow_ace_p;
2072
2073                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2074
2075                 if (curr_ace->attr != DENY_ACE)
2076                         continue;
2077
2078                 if (curr_ace->perms == (mode_t)0) {
2079
2080                         /* Deny nothing entry - delete. */
2081
2082                         DLIST_REMOVE(ace_list, curr_ace);
2083                         continue;
2084                 }
2085
2086                 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2087                         continue;
2088
2089                 /* JRATEST - assert. */
2090                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2091
2092                 if (curr_ace->perms == ALL_ACE_PERMS) {
2093
2094                         /*
2095                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2096                          * list at this point including this entry.
2097                          */
2098
2099                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2100
2101                         free_canon_ace_list( curr_ace );
2102                         if (prev_entry)
2103                                 DLIST_REMOVE(ace_list, prev_entry);
2104                         else {
2105                                 /* We deleted the entire list. */
2106                                 ace_list = NULL;
2107                         }
2108                         break;
2109                 }
2110
2111                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2112
2113                         /*
2114                          * Only mask off allow entries.
2115                          */
2116
2117                         if (allow_ace_p->attr != ALLOW_ACE)
2118                                 continue;
2119
2120                         allow_ace_p->perms &= ~curr_ace->perms;
2121                 }
2122
2123                 /*
2124                  * Now it's been applied, remove it.
2125                  */
2126
2127                 DLIST_REMOVE(ace_list, curr_ace);
2128         }
2129
2130         /* Pass 2 above - deal with deny user entries. */
2131
2132         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2133                 mode_t new_perms = (mode_t)0;
2134                 canon_ace *allow_ace_p;
2135
2136                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2137
2138                 if (curr_ace->attr != DENY_ACE)
2139                         continue;
2140
2141                 if (curr_ace->owner_type != UID_ACE)
2142                         continue;
2143
2144                 if (curr_ace->perms == ALL_ACE_PERMS) {
2145
2146                         /*
2147                          * Optimisation - this is a deny everything to this user.
2148                          * Convert to an allow nothing and push to the end of the list.
2149                          */
2150
2151                         curr_ace->attr = ALLOW_ACE;
2152                         curr_ace->perms = (mode_t)0;
2153                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2154                         continue;
2155                 }
2156
2157                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2158
2159                         if (allow_ace_p->attr != ALLOW_ACE)
2160                                 continue;
2161
2162                         /* We process GID_ACE and WORLD_ACE entries only. */
2163
2164                         if (allow_ace_p->owner_type == UID_ACE)
2165                                 continue;
2166
2167                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2168                                 new_perms |= allow_ace_p->perms;
2169                 }
2170
2171                 /*
2172                  * Convert to a allow entry, modify the perms and push to the end
2173                  * of the list.
2174                  */
2175
2176                 curr_ace->attr = ALLOW_ACE;
2177                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2178                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2179         }
2180
2181         /* Pass 3 above - deal with deny group entries. */
2182
2183         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2184                 canon_ace *allow_ace_p;
2185                 canon_ace *allow_everyone_p = NULL;
2186
2187                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2188
2189                 if (curr_ace->attr != DENY_ACE)
2190                         continue;
2191
2192                 if (curr_ace->owner_type != GID_ACE)
2193                         continue;
2194
2195                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2196
2197                         if (allow_ace_p->attr != ALLOW_ACE)
2198                                 continue;
2199
2200                         /* Store a pointer to the Everyone allow, if it exists. */
2201                         if (allow_ace_p->owner_type == WORLD_ACE)
2202                                 allow_everyone_p = allow_ace_p;
2203
2204                         /* We process UID_ACE entries only. */
2205
2206                         if (allow_ace_p->owner_type != UID_ACE)
2207                                 continue;
2208
2209                         /* Mask off the deny group perms. */
2210
2211                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2212                                 allow_ace_p->perms &= ~curr_ace->perms;
2213                 }
2214
2215                 /*
2216                  * Convert the deny to an allow with the correct perms and
2217                  * push to the end of the list.
2218                  */
2219
2220                 curr_ace->attr = ALLOW_ACE;
2221                 if (allow_everyone_p)
2222                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2223                 else
2224                         curr_ace->perms = (mode_t)0;
2225                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2226         }
2227
2228         /* Doing this fourth pass allows Windows semantics to be layered
2229          * on top of POSIX semantics. I'm not sure if this is desirable.
2230          * For example, in W2K ACLs there is no way to say, "Group X no
2231          * access, user Y full access" if user Y is a member of group X.
2232          * This seems completely broken semantics to me.... JRA.
2233          */
2234
2235 #if 0
2236         /* Pass 4 above - deal with allow entries. */
2237
2238         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2239                 canon_ace *allow_ace_p;
2240
2241                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2242
2243                 if (curr_ace->attr != ALLOW_ACE)
2244                         continue;
2245
2246                 if (curr_ace->owner_type != UID_ACE)
2247                         continue;
2248
2249                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2250
2251                         if (allow_ace_p->attr != ALLOW_ACE)
2252                                 continue;
2253
2254                         /* We process GID_ACE entries only. */
2255
2256                         if (allow_ace_p->owner_type != GID_ACE)
2257                                 continue;
2258
2259                         /* OR in the group perms. */
2260
2261                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2262                                 curr_ace->perms |= allow_ace_p->perms;
2263                 }
2264         }
2265 #endif
2266
2267         *pp_ace_list = ace_list;
2268 }
2269
2270 /****************************************************************************
2271  Create a default mode that will be used if a security descriptor entry has
2272  no user/group/world entries.
2273 ****************************************************************************/
2274
2275 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2276 {
2277         int snum = SNUM(fsp->conn);
2278         mode_t and_bits = (mode_t)0;
2279         mode_t or_bits = (mode_t)0;
2280         mode_t mode;
2281
2282         if (interitable_mode) {
2283                 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2284                                  fsp->fsp_name, NULL);
2285         } else {
2286                 mode = S_IRUSR;
2287         }
2288
2289         if (fsp->is_directory)
2290                 mode |= (S_IWUSR|S_IXUSR);
2291
2292         /*
2293          * Now AND with the create mode/directory mode bits then OR with the
2294          * force create mode/force directory mode bits.
2295          */
2296
2297         if (fsp->is_directory) {
2298                 and_bits = lp_dir_security_mask(snum);
2299                 or_bits = lp_force_dir_security_mode(snum);
2300         } else {
2301                 and_bits = lp_security_mask(snum);
2302                 or_bits = lp_force_security_mode(snum);
2303         }
2304
2305         return ((mode & and_bits)|or_bits);
2306 }
2307
2308 /****************************************************************************
2309  Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2310  succeeding.
2311 ****************************************************************************/
2312
2313 static bool unpack_canon_ace(files_struct *fsp,
2314                                 const SMB_STRUCT_STAT *pst,
2315                                 DOM_SID *pfile_owner_sid,
2316                                 DOM_SID *pfile_grp_sid,
2317                                 canon_ace **ppfile_ace,
2318                                 canon_ace **ppdir_ace,
2319                                 uint32 security_info_sent,
2320                                 const SEC_DESC *psd)
2321 {
2322         SMB_STRUCT_STAT st;
2323         canon_ace *file_ace = NULL;
2324         canon_ace *dir_ace = NULL;
2325
2326         *ppfile_ace = NULL;
2327         *ppdir_ace = NULL;
2328
2329         if(security_info_sent == 0) {
2330                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2331                 return False;
2332         }
2333
2334         /*
2335          * If no DACL then this is a chown only security descriptor.
2336          */
2337
2338         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2339                 return True;
2340
2341         /*
2342          * Now go through the DACL and create the canon_ace lists.
2343          */
2344
2345         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2346                                                                 &file_ace, &dir_ace, psd->dacl))
2347                 return False;
2348
2349         if ((file_ace == NULL) && (dir_ace == NULL)) {
2350                 /* W2K traverse DACL set - ignore. */
2351                 return True;
2352         }
2353
2354         /*
2355          * Go through the canon_ace list and merge entries
2356          * belonging to identical users of identical allow or deny type.
2357          * We can do this as all deny entries come first, followed by
2358          * all allow entries (we have mandated this before accepting this acl).
2359          */
2360
2361         print_canon_ace_list( "file ace - before merge", file_ace);
2362         merge_aces( &file_ace, false);
2363
2364         print_canon_ace_list( "dir ace - before merge", dir_ace);
2365         merge_aces( &dir_ace, true);
2366
2367         /*
2368          * NT ACLs are order dependent. Go through the acl lists and
2369          * process DENY entries by masking the allow entries.
2370          */
2371
2372         print_canon_ace_list( "file ace - before deny", file_ace);
2373         process_deny_list(fsp->conn, &file_ace);
2374
2375         print_canon_ace_list( "dir ace - before deny", dir_ace);
2376         process_deny_list(fsp->conn, &dir_ace);
2377
2378         /*
2379          * A well formed POSIX file or default ACL has at least 3 entries, a
2380          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2381          * and optionally a mask entry. Ensure this is the case.
2382          */
2383
2384         print_canon_ace_list( "file ace - before valid", file_ace);
2385
2386         st = *pst;
2387
2388         /*
2389          * A default 3 element mode entry for a file should be r-- --- ---.
2390          * A default 3 element mode entry for a directory should be rwx --- ---.
2391          */
2392
2393         st.st_ex_mode = create_default_mode(fsp, False);
2394
2395         if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2396                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2397                 free_canon_ace_list(file_ace);
2398                 free_canon_ace_list(dir_ace);
2399                 return False;
2400         }
2401
2402         print_canon_ace_list( "dir ace - before valid", dir_ace);
2403
2404         /*
2405          * A default inheritable 3 element mode entry for a directory should be the
2406          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2407          * it's a directory.
2408          */
2409
2410         st.st_ex_mode = create_default_mode(fsp, True);
2411
2412         if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2413                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2414                 free_canon_ace_list(file_ace);
2415                 free_canon_ace_list(dir_ace);
2416                 return False;
2417         }
2418
2419         print_canon_ace_list( "file ace - return", file_ace);
2420         print_canon_ace_list( "dir ace - return", dir_ace);
2421
2422         *ppfile_ace = file_ace;
2423         *ppdir_ace = dir_ace;
2424         return True;
2425
2426 }
2427
2428 /******************************************************************************
2429  When returning permissions, try and fit NT display
2430  semantics if possible. Note the the canon_entries here must have been malloced.
2431  The list format should be - first entry = owner, followed by group and other user
2432  entries, last entry = other.
2433
2434  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2435  are not ordered, and match on the most specific entry rather than walking a list,
2436  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2437
2438  Entry 0: owner : deny all except read and write.
2439  Entry 1: owner : allow read and write.
2440  Entry 2: group : deny all except read.
2441  Entry 3: group : allow read.
2442  Entry 4: Everyone : allow read.
2443
2444  But NT cannot display this in their ACL editor !
2445 ********************************************************************************/
2446
2447 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2448 {
2449         canon_ace *l_head = *pp_list_head;
2450         canon_ace *owner_ace = NULL;
2451         canon_ace *other_ace = NULL;
2452         canon_ace *ace = NULL;
2453
2454         for (ace = l_head; ace; ace = ace->next) {
2455                 if (ace->type == SMB_ACL_USER_OBJ)
2456                         owner_ace = ace;
2457                 else if (ace->type == SMB_ACL_OTHER) {
2458                         /* Last ace - this is "other" */
2459                         other_ace = ace;
2460                 }
2461         }
2462
2463         if (!owner_ace || !other_ace) {
2464                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2465                         filename ));
2466                 return;
2467         }
2468
2469         /*
2470          * The POSIX algorithm applies to owner first, and other last,
2471          * so ensure they are arranged in this order.
2472          */
2473
2474         if (owner_ace) {
2475                 DLIST_PROMOTE(l_head, owner_ace);
2476         }
2477
2478         if (other_ace) {
2479                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2480         }
2481
2482         /* We have probably changed the head of the list. */
2483
2484         *pp_list_head = l_head;
2485 }
2486
2487 /****************************************************************************
2488  Create a linked list of canonical ACE entries.
2489 ****************************************************************************/
2490
2491 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2492                                    const char *fname, SMB_ACL_T posix_acl,
2493                                    const SMB_STRUCT_STAT *psbuf,
2494                                    const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2495 {
2496         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2497         canon_ace *l_head = NULL;
2498         canon_ace *ace = NULL;
2499         canon_ace *next_ace = NULL;
2500         int entry_id = SMB_ACL_FIRST_ENTRY;
2501         SMB_ACL_ENTRY_T entry;
2502         size_t ace_count;
2503
2504         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2505                 SMB_ACL_TAG_T tagtype;
2506                 SMB_ACL_PERMSET_T permset;
2507                 DOM_SID sid;
2508                 posix_id unix_ug;
2509                 enum ace_owner owner_type;
2510
2511                 entry_id = SMB_ACL_NEXT_ENTRY;
2512
2513                 /* Is this a MASK entry ? */
2514                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2515                         continue;
2516
2517                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2518                         continue;
2519
2520                 /* Decide which SID to use based on the ACL type. */
2521                 switch(tagtype) {
2522                         case SMB_ACL_USER_OBJ:
2523                                 /* Get the SID from the owner. */
2524                                 sid_copy(&sid, powner);
2525                                 unix_ug.uid = psbuf->st_ex_uid;
2526                                 owner_type = UID_ACE;
2527                                 break;
2528                         case SMB_ACL_USER:
2529                                 {
2530                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2531                                         if (puid == NULL) {
2532                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2533                                                 continue;
2534                                         }
2535                                         uid_to_sid( &sid, *puid);
2536                                         unix_ug.uid = *puid;
2537                                         owner_type = UID_ACE;
2538                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2539                                         break;
2540                                 }
2541                         case SMB_ACL_GROUP_OBJ:
2542                                 /* Get the SID from the owning group. */
2543                                 sid_copy(&sid, pgroup);
2544                                 unix_ug.gid = psbuf->st_ex_gid;
2545                                 owner_type = GID_ACE;
2546                                 break;
2547                         case SMB_ACL_GROUP:
2548                                 {
2549                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2550                                         if (pgid == NULL) {
2551                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2552                                                 continue;
2553                                         }
2554                                         gid_to_sid( &sid, *pgid);
2555                                         unix_ug.gid = *pgid;
2556                                         owner_type = GID_ACE;
2557                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2558                                         break;
2559                                 }
2560                         case SMB_ACL_MASK:
2561                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2562                                 continue; /* Don't count the mask as an entry. */
2563                         case SMB_ACL_OTHER:
2564                                 /* Use the Everyone SID */
2565                                 sid = global_sid_World;
2566                                 unix_ug.world = -1;
2567                                 owner_type = WORLD_ACE;
2568                                 break;
2569                         default:
2570                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2571                                 continue;
2572                 }
2573
2574                 /*
2575                  * Add this entry to the list.
2576                  */
2577
2578                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2579                         goto fail;
2580
2581                 ZERO_STRUCTP(ace);
2582                 ace->type = tagtype;
2583                 ace->perms = convert_permset_to_mode_t(conn, permset);
2584                 ace->attr = ALLOW_ACE;
2585                 ace->trustee = sid;
2586                 ace->unix_ug = unix_ug;
2587                 ace->owner_type = owner_type;
2588                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2589
2590                 DLIST_ADD(l_head, ace);
2591         }
2592
2593         /*
2594          * This next call will ensure we have at least a user/group/world set.
2595          */
2596
2597         if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2598                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2599                                       psbuf, False))
2600                 goto fail;
2601
2602         /*
2603          * Now go through the list, masking the permissions with the
2604          * acl_mask. Ensure all DENY Entries are at the start of the list.
2605          */
2606
2607         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2608
2609         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2610                 next_ace = ace->next;
2611
2612                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2613                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2614                         ace->perms &= acl_mask;
2615
2616                 if (ace->perms == 0) {
2617                         DLIST_PROMOTE(l_head, ace);
2618                 }
2619
2620                 if( DEBUGLVL( 10 ) ) {
2621                         print_canon_ace(ace, ace_count);
2622                 }
2623         }
2624
2625         arrange_posix_perms(fname,&l_head );
2626
2627         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2628
2629         return l_head;
2630
2631   fail:
2632
2633         free_canon_ace_list(l_head);
2634         return NULL;
2635 }
2636
2637 /****************************************************************************
2638  Check if the current user group list contains a given group.
2639 ****************************************************************************/
2640
2641 static bool current_user_in_group(connection_struct *conn, gid_t gid)
2642 {
2643         int i;
2644
2645         for (i = 0; i < current_user.ut.ngroups; i++) {
2646                 if (current_user.ut.groups[i] == gid) {
2647                         return True;
2648                 }
2649         }
2650
2651         return False;
2652 }
2653
2654 /****************************************************************************
2655  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2656 ****************************************************************************/
2657
2658 static bool acl_group_override(connection_struct *conn,
2659                                const struct smb_filename *smb_fname)
2660 {
2661         if ((errno != EPERM) && (errno != EACCES)) {
2662                 return false;
2663         }
2664
2665         /* file primary group == user primary or supplementary group */
2666         if (lp_acl_group_control(SNUM(conn)) &&
2667             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2668                 return true;
2669         }
2670
2671         /* user has writeable permission */
2672         if (lp_dos_filemode(SNUM(conn)) &&
2673             can_write_to_file(conn, smb_fname)) {
2674                 return true;
2675         }
2676
2677         return false;
2678 }
2679
2680 /****************************************************************************
2681  Attempt to apply an ACL to a file or directory.
2682 ****************************************************************************/
2683
2684 static bool set_canon_ace_list(files_struct *fsp,
2685                                 canon_ace *the_ace,
2686                                 bool default_ace,
2687                                 const SMB_STRUCT_STAT *psbuf,
2688                                 bool *pacl_set_support)
2689 {
2690         connection_struct *conn = fsp->conn;
2691         bool ret = False;
2692         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2693         canon_ace *p_ace;
2694         int i;
2695         SMB_ACL_ENTRY_T mask_entry;
2696         bool got_mask_entry = False;
2697         SMB_ACL_PERMSET_T mask_permset;
2698         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2699         bool needs_mask = False;
2700         mode_t mask_perms = 0;
2701
2702         /* Use the psbuf that was passed in. */
2703         fsp->fsp_name->st = *psbuf;
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)
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
3841         DEBUG(10,("set_nt_acl: called for file %s\n",
3842                   fsp_str_dbg(fsp)));
3843
3844         if (!CAN_WRITE(conn)) {
3845                 DEBUG(10,("set acl rejected on read-only share\n"));
3846                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3847         }
3848
3849         /*
3850          * Get the current state of the file.
3851          */
3852
3853         status = vfs_stat_fsp(fsp);
3854         if (!NT_STATUS_IS_OK(status)) {
3855                 return status;
3856         }
3857
3858         /* Save the original element we check against. */
3859         orig_mode = fsp->fsp_name->st.st_ex_mode;
3860
3861         /*
3862          * Unpack the user/group/world id's.
3863          */
3864
3865         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3866         if (!NT_STATUS_IS_OK(status)) {
3867                 return status;
3868         }
3869
3870         /*
3871          * Do we need to chown ? If so this must be done first as the incoming
3872          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3873          * Noticed by Simo.
3874          */
3875
3876         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3877             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3878
3879                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3880                          fsp_str_dbg(fsp), (unsigned int)user,
3881                          (unsigned int)grp));
3882
3883                 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3884                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3885                                  "= %s.\n", fsp_str_dbg(fsp),
3886                                  (unsigned int)user, (unsigned int)grp,
3887                                  strerror(errno)));
3888                         if (errno == EPERM) {
3889                                 return NT_STATUS_INVALID_OWNER;
3890                         }
3891                         return map_nt_error_from_unix(errno);
3892                 }
3893
3894                 /*
3895                  * Recheck the current state of the file, which may have changed.
3896                  * (suid/sgid bits, for instance)
3897                  */
3898
3899                 status = vfs_stat_fsp(fsp);
3900                 if (!NT_STATUS_IS_OK(status)) {
3901                         return status;
3902                 }
3903
3904                 /* Save the original element we check against. */
3905                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3906
3907                 /* If we successfully chowned, we know we must
3908                  * be able to set the acl, so do it as root.
3909                  */
3910                 set_acl_as_root = true;
3911         }
3912
3913         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3914
3915         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3916                                      &file_grp_sid, &file_ace_list,
3917                                      &dir_ace_list, security_info_sent, psd);
3918
3919         /* Ignore W2K traverse DACL set. */
3920         if (!file_ace_list && !dir_ace_list) {
3921                 return NT_STATUS_OK;
3922         }
3923
3924         if (!acl_perms) {
3925                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3926                 free_canon_ace_list(file_ace_list);
3927                 free_canon_ace_list(dir_ace_list);
3928                 return NT_STATUS_ACCESS_DENIED;
3929         }
3930
3931         /*
3932          * Only change security if we got a DACL.
3933          */
3934
3935         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3936                 free_canon_ace_list(file_ace_list);
3937                 free_canon_ace_list(dir_ace_list);
3938                 return NT_STATUS_OK;
3939         }
3940
3941         /*
3942          * Try using the POSIX ACL set first. Fall back to chmod if
3943          * we have no ACL support on this filesystem.
3944          */
3945
3946         if (acl_perms && file_ace_list) {
3947                 if (set_acl_as_root) {
3948                         become_root();
3949                 }
3950                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3951                                          &fsp->fsp_name->st, &acl_set_support);
3952                 if (set_acl_as_root) {
3953                         unbecome_root();
3954                 }
3955                 if (acl_set_support && ret == false) {
3956                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3957                                  "%s (%s).\n", fsp_str_dbg(fsp),
3958                                  strerror(errno)));
3959                         free_canon_ace_list(file_ace_list);
3960                         free_canon_ace_list(dir_ace_list);
3961                         return map_nt_error_from_unix(errno);
3962                 }
3963         }
3964
3965         if (acl_perms && acl_set_support && fsp->is_directory) {
3966                 if (dir_ace_list) {
3967                         if (set_acl_as_root) {
3968                                 become_root();
3969                         }
3970                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
3971                                                  &fsp->fsp_name->st,
3972                                                  &acl_set_support);
3973                         if (set_acl_as_root) {
3974                                 unbecome_root();
3975                         }
3976                         if (ret == false) {
3977                                 DEBUG(3,("set_nt_acl: failed to set default "
3978                                          "acl on directory %s (%s).\n",
3979                                          fsp_str_dbg(fsp), strerror(errno)));
3980                                 free_canon_ace_list(file_ace_list);
3981                                 free_canon_ace_list(dir_ace_list);
3982                                 return map_nt_error_from_unix(errno);
3983                         }
3984                 } else {
3985                         int sret = -1;
3986
3987                         /*
3988                          * No default ACL - delete one if it exists.
3989                          */
3990
3991                         if (set_acl_as_root) {
3992                                 become_root();
3993                         }
3994                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3995                             fsp->fsp_name->base_name);
3996                         if (set_acl_as_root) {
3997                                 unbecome_root();
3998                         }
3999                         if (sret == -1) {
4000                                 if (acl_group_override(conn, fsp->fsp_name)) {
4001                                         DEBUG(5,("set_nt_acl: acl group "
4002                                                  "control on and current user "
4003                                                  "in file %s primary group. "
4004                                                  "Override delete_def_acl\n",
4005                                                  fsp_str_dbg(fsp)));
4006
4007                                         become_root();
4008                                         sret =
4009                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4010                                                     conn,
4011                                                     fsp->fsp_name->base_name);
4012                                         unbecome_root();
4013                                 }
4014
4015                                 if (sret == -1) {
4016                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4017                                         free_canon_ace_list(file_ace_list);
4018                                         free_canon_ace_list(dir_ace_list);
4019                                         return map_nt_error_from_unix(errno);
4020                                 }
4021                         }
4022                 }
4023         }
4024
4025         if (acl_set_support) {
4026                 if (set_acl_as_root) {
4027                         become_root();
4028                 }
4029                 store_inheritance_attributes(fsp,
4030                                 file_ace_list,
4031                                 dir_ace_list,
4032                                 psd->type);
4033                 if (set_acl_as_root) {
4034                         unbecome_root();
4035                 }
4036         }
4037
4038         /*
4039          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4040          */
4041
4042         if(!acl_set_support && acl_perms) {
4043                 mode_t posix_perms;
4044
4045                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4046                         free_canon_ace_list(file_ace_list);
4047                         free_canon_ace_list(dir_ace_list);
4048                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4049                                  "posix permissions for file %s.\n",
4050                                  fsp_str_dbg(fsp)));
4051                         return NT_STATUS_ACCESS_DENIED;
4052                 }
4053
4054                 if (orig_mode != posix_perms) {
4055                         int sret = -1;
4056
4057                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4058                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4059
4060                         if (set_acl_as_root) {
4061                                 become_root();
4062                         }
4063                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4064                                              posix_perms);
4065                         if (set_acl_as_root) {
4066                                 unbecome_root();
4067                         }
4068                         if(sret == -1) {
4069                                 if (acl_group_override(conn, fsp->fsp_name)) {
4070                                         DEBUG(5,("set_nt_acl: acl group "
4071                                                  "control on and current user "
4072                                                  "in file %s primary group. "
4073                                                  "Override chmod\n",
4074                                                  fsp_str_dbg(fsp)));
4075
4076                                         become_root();
4077                                         sret = SMB_VFS_CHMOD(conn,
4078                                             fsp->fsp_name->base_name,
4079                                             posix_perms);
4080                                         unbecome_root();
4081                                 }
4082
4083                                 if (sret == -1) {
4084                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4085                                                  "failed. Error = %s.\n",
4086                                                  fsp_str_dbg(fsp),
4087                                                  (unsigned int)posix_perms,
4088                                                  strerror(errno)));
4089                                         free_canon_ace_list(file_ace_list);
4090                                         free_canon_ace_list(dir_ace_list);
4091                                         return map_nt_error_from_unix(errno);
4092                                 }
4093                         }
4094                 }
4095         }
4096
4097         free_canon_ace_list(file_ace_list);
4098         free_canon_ace_list(dir_ace_list);
4099
4100         /* Ensure the stat struct in the fsp is correct. */
4101         status = vfs_stat_fsp(fsp);
4102
4103         return NT_STATUS_OK;
4104 }
4105
4106 /****************************************************************************
4107  Get the actual group bits stored on a file with an ACL. Has no effect if
4108  the file has no ACL. Needed in dosmode code where the stat() will return
4109  the mask bits, not the real group bits, for a file with an ACL.
4110 ****************************************************************************/
4111
4112 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4113 {
4114         int entry_id = SMB_ACL_FIRST_ENTRY;
4115         SMB_ACL_ENTRY_T entry;
4116         SMB_ACL_T posix_acl;
4117         int result = -1;
4118
4119         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4120         if (posix_acl == (SMB_ACL_T)NULL)
4121                 return -1;
4122
4123         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4124                 SMB_ACL_TAG_T tagtype;
4125                 SMB_ACL_PERMSET_T permset;
4126
4127                 entry_id = SMB_ACL_NEXT_ENTRY;
4128
4129                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4130                         break;
4131
4132                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4133                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4134                                 break;
4135                         } else {
4136                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4137                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4138                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4139                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4140                                 result = 0;
4141                                 break;
4142                         }
4143                 }
4144         }
4145         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4146         return result;
4147 }
4148
4149 /****************************************************************************
4150  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4151  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4152 ****************************************************************************/
4153
4154 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4155 {
4156         int entry_id = SMB_ACL_FIRST_ENTRY;
4157         SMB_ACL_ENTRY_T entry;
4158         int num_entries = 0;
4159
4160         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4161                 SMB_ACL_TAG_T tagtype;
4162                 SMB_ACL_PERMSET_T permset;
4163                 mode_t perms;
4164
4165                 entry_id = SMB_ACL_NEXT_ENTRY;
4166
4167                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4168                         return -1;
4169
4170                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4171                         return -1;
4172
4173                 num_entries++;
4174
4175                 switch(tagtype) {
4176                         case SMB_ACL_USER_OBJ:
4177                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4178                                 break;
4179                         case SMB_ACL_GROUP_OBJ:
4180                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4181                                 break;
4182                         case SMB_ACL_MASK:
4183                                 /*
4184                                  * FIXME: The ACL_MASK entry permissions should really be set to
4185                                  * the union of the permissions of all ACL_USER,
4186                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4187                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4188                                  */
4189                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4190                                 break;
4191                         case SMB_ACL_OTHER:
4192                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4193                                 break;
4194                         default:
4195                                 continue;
4196                 }
4197
4198                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4199                         return -1;
4200
4201                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4202                         return -1;
4203         }
4204
4205         /*
4206          * If this is a simple 3 element ACL or no elements then it's a standard
4207          * UNIX permission set. Just use chmod...
4208          */
4209
4210         if ((num_entries == 3) || (num_entries == 0))
4211                 return -1;
4212
4213         return 0;
4214 }
4215
4216 /****************************************************************************
4217  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4218  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4219  resulting ACL on TO.  Note that name is in UNIX character set.
4220 ****************************************************************************/
4221
4222 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4223 {
4224         SMB_ACL_T posix_acl = NULL;
4225         int ret = -1;
4226
4227         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4228                 return -1;
4229
4230         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4231                 goto done;
4232
4233         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4234
4235  done:
4236
4237         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4238         return ret;
4239 }
4240
4241 /****************************************************************************
4242  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4243  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4244  Note that name is in UNIX character set.
4245 ****************************************************************************/
4246
4247 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4248 {
4249         return copy_access_posix_acl(conn, name, name, mode);
4250 }
4251
4252 /****************************************************************************
4253  Check for an existing default POSIX ACL on a directory.
4254 ****************************************************************************/
4255
4256 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4257 {
4258         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4259         bool has_acl = False;
4260         SMB_ACL_ENTRY_T entry;
4261
4262         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4263                 has_acl = True;
4264         }
4265
4266         if (def_acl) {
4267                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4268         }
4269         return has_acl;
4270 }
4271
4272 /****************************************************************************
4273  If the parent directory has no default ACL but it does have an Access ACL,
4274  inherit this Access ACL to file name.
4275 ****************************************************************************/
4276
4277 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4278                        const char *name, mode_t mode)
4279 {
4280         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4281                 return 0;
4282
4283         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4284 }
4285
4286 /****************************************************************************
4287  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4288  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4289 ****************************************************************************/
4290
4291 int fchmod_acl(files_struct *fsp, mode_t mode)
4292 {
4293         connection_struct *conn = fsp->conn;
4294         SMB_ACL_T posix_acl = NULL;
4295         int ret = -1;
4296
4297         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4298                 return -1;
4299
4300         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4301                 goto done;
4302
4303         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4304
4305   done:
4306
4307         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4308         return ret;
4309 }
4310
4311 /****************************************************************************
4312  Map from wire type to permset.
4313 ****************************************************************************/
4314
4315 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4316 {
4317         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4318                 return False;
4319         }
4320
4321         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4322                 return False;
4323         }
4324
4325         if (wire_perm & SMB_POSIX_ACL_READ) {
4326                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4327                         return False;
4328                 }
4329         }
4330         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4331                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4332                         return False;
4333                 }
4334         }
4335         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4336                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4337                         return False;
4338                 }
4339         }
4340         return True;
4341 }
4342
4343 /****************************************************************************
4344  Map from wire type to tagtype.
4345 ****************************************************************************/
4346
4347 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4348 {
4349         switch (wire_tt) {
4350                 case SMB_POSIX_ACL_USER_OBJ:
4351                         *p_tt = SMB_ACL_USER_OBJ;
4352                         break;
4353                 case SMB_POSIX_ACL_USER:
4354                         *p_tt = SMB_ACL_USER;
4355                         break;
4356                 case SMB_POSIX_ACL_GROUP_OBJ:
4357                         *p_tt = SMB_ACL_GROUP_OBJ;
4358                         break;
4359                 case SMB_POSIX_ACL_GROUP:
4360                         *p_tt = SMB_ACL_GROUP;
4361                         break;
4362                 case SMB_POSIX_ACL_MASK:
4363                         *p_tt = SMB_ACL_MASK;
4364                         break;
4365                 case SMB_POSIX_ACL_OTHER:
4366                         *p_tt = SMB_ACL_OTHER;
4367                         break;
4368                 default:
4369                         return False;
4370         }
4371         return True;
4372 }
4373
4374 /****************************************************************************
4375  Create a new POSIX acl from wire permissions.
4376  FIXME ! How does the share mask/mode fit into this.... ?
4377 ****************************************************************************/
4378
4379 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4380 {
4381         unsigned int i;
4382         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4383
4384         if (the_acl == NULL) {
4385                 return NULL;
4386         }
4387
4388         for (i = 0; i < num_acls; i++) {
4389                 SMB_ACL_ENTRY_T the_entry;
4390                 SMB_ACL_PERMSET_T the_permset;
4391                 SMB_ACL_TAG_T tag_type;
4392
4393                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4394                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4395                                 i, strerror(errno) ));
4396                         goto fail;
4397                 }
4398
4399                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4400                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4401                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4402                         goto fail;
4403                 }
4404
4405                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4406                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4407                                 i, strerror(errno) ));
4408                         goto fail;
4409                 }
4410
4411                 /* Get the permset pointer from the new ACL entry. */
4412                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4413                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4414                                 i, strerror(errno) ));
4415                         goto fail;
4416                 }
4417
4418                 /* Map from wire to permissions. */
4419                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4420                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4421                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4422                         goto fail;
4423                 }
4424
4425                 /* Now apply to the new ACL entry. */
4426                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4427                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4428                                 i, strerror(errno) ));
4429                         goto fail;
4430                 }
4431
4432                 if (tag_type == SMB_ACL_USER) {
4433                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4434                         uid_t uid = (uid_t)uidval;
4435                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4436                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4437                                         (unsigned int)uid, i, strerror(errno) ));
4438                                 goto fail;
4439                         }
4440                 }
4441
4442                 if (tag_type == SMB_ACL_GROUP) {
4443                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4444                         gid_t gid = (uid_t)gidval;
4445                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4446                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4447                                         (unsigned int)gid, i, strerror(errno) ));
4448                                 goto fail;
4449                         }
4450                 }
4451         }
4452
4453         return the_acl;
4454
4455  fail:
4456
4457         if (the_acl != NULL) {
4458                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4459         }
4460         return NULL;
4461 }
4462
4463 /****************************************************************************
4464  Calls from UNIX extensions - Default POSIX ACL set.
4465  If num_def_acls == 0 and not a directory just return. If it is a directory
4466  and num_def_acls == 0 then remove the default acl. Else set the default acl
4467  on the directory.
4468 ****************************************************************************/
4469
4470 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4471                                 uint16 num_def_acls, const char *pdata)
4472 {
4473         SMB_ACL_T def_acl = NULL;
4474
4475         if (!S_ISDIR(psbuf->st_ex_mode)) {
4476                 if (num_def_acls) {
4477                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4478                         errno = EISDIR;
4479                         return False;
4480                 } else {
4481                         return True;
4482                 }
4483         }
4484
4485         if (!num_def_acls) {
4486                 /* Remove the default ACL. */
4487                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4488                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4489                                 fname, strerror(errno) ));
4490                         return False;
4491                 }
4492                 return True;
4493         }
4494
4495         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4496                 return False;
4497         }
4498
4499         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4500                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4501                         fname, strerror(errno) ));
4502                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4503                 return False;
4504         }
4505
4506         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4507         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4508         return True;
4509 }
4510
4511 /****************************************************************************
4512  Remove an ACL from a file. As we don't have acl_delete_entry() available
4513  we must read the current acl and copy all entries except MASK, USER and GROUP
4514  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4515  removed.
4516  FIXME ! How does the share mask/mode fit into this.... ?
4517 ****************************************************************************/
4518
4519 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4520 {
4521         SMB_ACL_T file_acl = NULL;
4522         int entry_id = SMB_ACL_FIRST_ENTRY;
4523         SMB_ACL_ENTRY_T entry;
4524         bool ret = False;
4525         /* Create a new ACL with only 3 entries, u/g/w. */
4526         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4527         SMB_ACL_ENTRY_T user_ent = NULL;
4528         SMB_ACL_ENTRY_T group_ent = NULL;
4529         SMB_ACL_ENTRY_T other_ent = NULL;
4530
4531         if (new_file_acl == NULL) {
4532                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4533                 return False;
4534         }
4535
4536         /* Now create the u/g/w entries. */
4537         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4538                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4539                         fname, strerror(errno) ));
4540                 goto done;
4541         }
4542         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4543                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4544                         fname, strerror(errno) ));
4545                 goto done;
4546         }
4547
4548         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4549                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4550                         fname, strerror(errno) ));
4551                 goto done;
4552         }
4553         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4554                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4555                         fname, strerror(errno) ));
4556                 goto done;
4557         }
4558
4559         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4560                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4561                         fname, strerror(errno) ));
4562                 goto done;
4563         }
4564         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4565                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4566                         fname, strerror(errno) ));
4567                 goto done;
4568         }
4569
4570         /* Get the current file ACL. */
4571         if (fsp && fsp->fh->fd != -1) {
4572                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4573         } else {
4574                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4575         }
4576
4577         if (file_acl == NULL) {
4578                 /* This is only returned if an error occurred. Even for a file with
4579                    no acl a u/g/w acl should be returned. */
4580                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4581                         fname, strerror(errno) ));
4582                 goto done;
4583         }
4584
4585         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4586                 SMB_ACL_TAG_T tagtype;
4587                 SMB_ACL_PERMSET_T permset;
4588
4589                 entry_id = SMB_ACL_NEXT_ENTRY;
4590
4591                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4592                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4593                                 fname, strerror(errno) ));
4594                         goto done;
4595                 }
4596
4597                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4598                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4599                                 fname, strerror(errno) ));
4600                         goto done;
4601                 }
4602
4603                 if (tagtype == SMB_ACL_USER_OBJ) {
4604                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4605                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4606                                         fname, strerror(errno) ));
4607                         }
4608                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4609                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4610                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4611                                         fname, strerror(errno) ));
4612                         }
4613                 } else if (tagtype == SMB_ACL_OTHER) {
4614                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_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                 }
4619         }
4620
4621         /* Set the new empty file ACL. */
4622         if (fsp && fsp->fh->fd != -1) {
4623                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4624                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4625                                 fname, strerror(errno) ));
4626                         goto done;
4627                 }
4628         } else {
4629                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4630                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4631                                 fname, strerror(errno) ));
4632                         goto done;
4633                 }
4634         }
4635
4636         ret = True;
4637
4638  done:
4639
4640         if (file_acl) {
4641                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4642         }
4643         if (new_file_acl) {
4644                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4645         }
4646         return ret;
4647 }
4648
4649 /****************************************************************************
4650  Calls from UNIX extensions - POSIX ACL set.
4651  If num_def_acls == 0 then read/modify/write acl after removing all entries
4652  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4653 ****************************************************************************/
4654
4655 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4656 {
4657         SMB_ACL_T file_acl = NULL;
4658
4659         if (!num_acls) {
4660                 /* Remove the ACL from the file. */
4661                 return remove_posix_acl(conn, fsp, fname);
4662         }
4663
4664         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4665                 return False;
4666         }
4667
4668         if (fsp && fsp->fh->fd != -1) {
4669                 /* The preferred way - use an open fd. */
4670                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4671                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4672                                 fname, strerror(errno) ));
4673                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4674                         return False;
4675                 }
4676         } else {
4677                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4678                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4679                                 fname, strerror(errno) ));
4680                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4681                         return False;
4682                 }
4683         }
4684
4685         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4686         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4687         return True;
4688 }
4689
4690 /********************************************************************
4691  Pull the NT ACL from a file on disk or the OpenEventlog() access
4692  check.  Caller is responsible for freeing the returned security
4693  descriptor via TALLOC_FREE().  This is designed for dealing with
4694  user space access checks in smbd outside of the VFS.  For example,
4695  checking access rights in OpenEventlog().
4696
4697  Assume we are dealing with files (for now)
4698 ********************************************************************/
4699
4700 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4701 {
4702         SEC_DESC *psd, *ret_sd;
4703         connection_struct *conn;
4704         files_struct finfo;
4705         struct fd_handle fh;
4706         NTSTATUS status;
4707
4708         conn = TALLOC_ZERO_P(ctx, connection_struct);
4709         if (conn == NULL) {
4710                 DEBUG(0, ("talloc failed\n"));
4711                 return NULL;
4712         }
4713
4714         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4715                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4716                 TALLOC_FREE(conn);
4717                 return NULL;
4718         }
4719
4720         conn->params->service = -1;
4721
4722         set_conn_connectpath(conn, "/");
4723
4724         if (!smbd_vfs_init(conn)) {
4725                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4726                 conn_free(conn);
4727                 return NULL;
4728         }
4729
4730         ZERO_STRUCT( finfo );
4731         ZERO_STRUCT( fh );
4732
4733         finfo.fnum = -1;
4734         finfo.conn = conn;
4735         finfo.fh = &fh;
4736         finfo.fh->fd = -1;
4737
4738         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4739                                             &finfo.fsp_name);
4740         if (!NT_STATUS_IS_OK(status)) {
4741                 conn_free(conn);
4742                 return NULL;
4743         }
4744
4745         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4746                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4747                 TALLOC_FREE(finfo.fsp_name);
4748                 conn_free(conn);
4749                 return NULL;
4750         }
4751
4752         ret_sd = dup_sec_desc( ctx, psd );
4753
4754         TALLOC_FREE(finfo.fsp_name);
4755         conn_free(conn);
4756
4757         return ret_sd;
4758 }