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