source3/smbd/posix_acls.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB NT Security Descriptor / Unix permission conversion.
   4    Copyright (C) Jeremy Allison 1994-2009.
   5    Copyright (C) Andreas Gruenbacher 2002.
   6    Copyright (C) Simo Sorce <idra@samba.org> 2009.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23
  24 extern struct current_user current_user;
  25 extern const struct generic_mapping file_generic_mapping;
  26
  27 #undef  DBGC_CLASS
  28 #define DBGC_CLASS DBGC_ACLS
  29
  30 /****************************************************************************
  31  Data structures representing the internal ACE format.
  32 ****************************************************************************/
  33
  34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  36
  37 typedef union posix_id {
  38                 uid_t uid;
  39                 gid_t gid;
  40                 int world;
  41 } posix_id;
  42
  43 typedef struct canon_ace {
  44         struct canon_ace *next, *prev;
  45         SMB_ACL_TAG_T type;
  46         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  47         DOM_SID trustee;
  48         enum ace_owner owner_type;
  49         enum ace_attribute attr;
  50         posix_id unix_ug;
  51         uint8_t ace_flags; /* From windows ACE entry. */
  52 } canon_ace;
  53
  54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  55
  56 /*
  57  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  58  * attribute on disk - version 1.
  59  * All values are little endian.
  60  *
  61  * |  1   |  1   |   2         |         2           |  ....
  62  * +------+------+-------------+---------------------+-------------+--------------------+
  63  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  64  * +------+------+-------------+---------------------+-------------+--------------------+
  65  *
  66  * Entry format is :
  67  *
  68  * |  1   |       4           |
  69  * +------+-------------------+
  70  * | value|  uid/gid or world |
  71  * | type |  value            |
  72  * +------+-------------------+
  73  *
  74  * Version 2 format. Stores extra Windows metadata about an ACL.
  75  *
  76  * |  1   |  2       |   2         |         2           |  ....
  77  * +------+----------+-------------+---------------------+-------------+--------------------+
  78  * | vers | ace      | num_entries | num_default_entries | ..entries.. | default_entries... |
  79  * |   2  |  type    |             |                     |             |                    |
  80  * +------+----------+-------------+---------------------+-------------+--------------------+
  81  *
  82  * Entry format is :
  83  *
  84  * |  1   |  1   |       4           |
  85  * +------+------+-------------------+
  86  * | ace  | value|  uid/gid or world |
  87  * | flag | type |  value            |
  88  * +------+-------------------+------+
  89  *
  90  */
  91
  92 #define PAI_VERSION_OFFSET                      0
  93
  94 #define PAI_V1_FLAG_OFFSET                      1
  95 #define PAI_V1_NUM_ENTRIES_OFFSET               2
  96 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET       4
  97 #define PAI_V1_ENTRIES_BASE                     6
  98 #define PAI_V1_ACL_FLAG_PROTECTED               0x1
  99 #define PAI_V1_ENTRY_LENGTH                     5
 100
 101 #define PAI_V1_VERSION                          1
 102
 103 #define PAI_V2_TYPE_OFFSET                      1
 104 #define PAI_V2_NUM_ENTRIES_OFFSET               3
 105 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET       5
 106 #define PAI_V2_ENTRIES_BASE                     7
 107 #define PAI_V2_ENTRY_LENGTH                     6
 108
 109 #define PAI_V2_VERSION                          2
 110
 111 /*
 112  * In memory format of user.SAMBA_PAI attribute.
 113  */
 114
 115 struct pai_entry {
 116         struct pai_entry *next, *prev;
 117         uint8_t ace_flags;
 118         enum ace_owner owner_type;
 119         posix_id unix_ug;
 120 };
 121
 122 struct pai_val {
 123         uint16_t sd_type;
 124         unsigned int num_entries;
 125         struct pai_entry *entry_list;
 126         unsigned int num_def_entries;
 127         struct pai_entry *def_entry_list;
 128 };
 129
 130 /************************************************************************
 131  Return a uint32 of the pai_entry principal.
 132 ************************************************************************/
 133
 134 static uint32_t get_pai_entry_val(struct pai_entry *paie)
 135 {
 136         switch (paie->owner_type) {
 137                 case UID_ACE:
 138                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 139                         return (uint32_t)paie->unix_ug.uid;
 140                 case GID_ACE:
 141                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 142                         return (uint32_t)paie->unix_ug.gid;
 143                 case WORLD_ACE:
 144                 default:
 145                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 146                         return (uint32_t)-1;
 147         }
 148 }
 149
 150 /************************************************************************
 151  Return a uint32 of the entry principal.
 152 ************************************************************************/
 153
 154 static uint32_t get_entry_val(canon_ace *ace_entry)
 155 {
 156         switch (ace_entry->owner_type) {
 157                 case UID_ACE:
 158                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
 159                         return (uint32_t)ace_entry->unix_ug.uid;
 160                 case GID_ACE:
 161                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
 162                         return (uint32_t)ace_entry->unix_ug.gid;
 163                 case WORLD_ACE:
 164                 default:
 165                         DEBUG(10,("get_entry_val: world ace\n"));
 166                         return (uint32_t)-1;
 167         }
 168 }
 169
 170 /************************************************************************
 171  Create the on-disk format (always v2 now). Caller must free.
 172 ************************************************************************/
 173
 174 static char *create_pai_buf_v2(canon_ace *file_ace_list,
 175                                 canon_ace *dir_ace_list,
 176                                 uint16_t sd_type,
 177                                 size_t *store_size)
 178 {
 179         char *pai_buf = NULL;
 180         canon_ace *ace_list = NULL;
 181         char *entry_offset = NULL;
 182         unsigned int num_entries = 0;
 183         unsigned int num_def_entries = 0;
 184         unsigned int i;
 185
 186         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 187                 num_entries++;
 188         }
 189
 190         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 191                 num_def_entries++;
 192         }
 193
 194         DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 195
 196         *store_size = PAI_V2_ENTRIES_BASE +
 197                 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
 198
 199         pai_buf = (char *)SMB_MALLOC(*store_size);
 200         if (!pai_buf) {
 201                 return NULL;
 202         }
 203
 204         /* Set up the header. */
 205         memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
 206         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
 207         SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
 208         SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
 209         SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 210
 211         DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
 212                         (unsigned int)sd_type ));
 213
 214         entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
 215
 216         i = 0;
 217         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 218                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 219                 uint32_t entry_val = get_entry_val(ace_list);
 220
 221                 SCVAL(entry_offset,0,ace_list->ace_flags);
 222                 SCVAL(entry_offset,1,type_val);
 223                 SIVAL(entry_offset,2,entry_val);
 224                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 225                         i,
 226                         (unsigned int)ace_list->ace_flags,
 227                         (unsigned int)type_val,
 228                         (unsigned int)entry_val ));
 229                 i++;
 230                 entry_offset += PAI_V2_ENTRY_LENGTH;
 231         }
 232
 233         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 234                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 235                 uint32_t entry_val = get_entry_val(ace_list);
 236
 237                 SCVAL(entry_offset,0,ace_list->ace_flags);
 238                 SCVAL(entry_offset,1,type_val);
 239                 SIVAL(entry_offset,2,entry_val);
 240                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 241                         i,
 242                         (unsigned int)ace_list->ace_flags,
 243                         (unsigned int)type_val,
 244                         (unsigned int)entry_val ));
 245                 i++;
 246                 entry_offset += PAI_V2_ENTRY_LENGTH;
 247         }
 248
 249         return pai_buf;
 250 }
 251
 252 /************************************************************************
 253  Store the user.SAMBA_PAI attribute on disk.
 254 ************************************************************************/
 255
 256 static void store_inheritance_attributes(files_struct *fsp,
 257                                         canon_ace *file_ace_list,
 258                                         canon_ace *dir_ace_list,
 259                                         uint16_t sd_type)
 260 {
 261         int ret;
 262         size_t store_size;
 263         char *pai_buf;
 264
 265         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 266                 return;
 267         }
 268
 269         pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
 270                                 sd_type, &store_size);
 271
 272         if (fsp->fh->fd != -1) {
 273                 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 274                                 pai_buf, store_size, 0);
 275         } else {
 276                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
 277                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 278                                        pai_buf, store_size, 0);
 279         }
 280
 281         SAFE_FREE(pai_buf);
 282
 283         DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
 284                 (unsigned int)sd_type,
 285                 fsp_str_dbg(fsp)));
 286
 287         if (ret == -1 && !no_acl_syscall_error(errno)) {
 288                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 289         }
 290 }
 291
 292 /************************************************************************
 293  Delete the in memory inheritance info.
 294 ************************************************************************/
 295
 296 static void free_inherited_info(struct pai_val *pal)
 297 {
 298         if (pal) {
 299                 struct pai_entry *paie, *paie_next;
 300                 for (paie = pal->entry_list; paie; paie = paie_next) {
 301                         paie_next = paie->next;
 302                         SAFE_FREE(paie);
 303                 }
 304                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 305                         paie_next = paie->next;
 306                         SAFE_FREE(paie);
 307                 }
 308                 SAFE_FREE(pal);
 309         }
 310 }
 311
 312 /************************************************************************
 313  Get any stored ACE flags.
 314 ************************************************************************/
 315
 316 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
 317 {
 318         struct pai_entry *paie;
 319
 320         if (!pal) {
 321                 return 0;
 322         }
 323
 324         /* If the entry exists it is inherited. */
 325         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 326                 if (ace_entry->owner_type == paie->owner_type &&
 327                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 328                         return paie->ace_flags;
 329         }
 330         return 0;
 331 }
 332
 333 /************************************************************************
 334  Ensure an attribute just read is valid - v1.
 335 ************************************************************************/
 336
 337 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
 338 {
 339         uint16 num_entries;
 340         uint16 num_def_entries;
 341
 342         if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
 343                 /* Corrupted - too small. */
 344                 return false;
 345         }
 346
 347         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
 348                 return false;
 349         }
 350
 351         num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
 352         num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 353
 354         /* Check the entry lists match. */
 355         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 356
 357         if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
 358                         PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
 359                 return false;
 360         }
 361
 362         return true;
 363 }
 364
 365 /************************************************************************
 366  Ensure an attribute just read is valid - v2.
 367 ************************************************************************/
 368
 369 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
 370 {
 371         uint16 num_entries;
 372         uint16 num_def_entries;
 373
 374         if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
 375                 /* Corrupted - too small. */
 376                 return false;
 377         }
 378
 379         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
 380                 return false;
 381         }
 382
 383         num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
 384         num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 385
 386         /* Check the entry lists match. */
 387         /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
 388
 389         if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
 390                         PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
 391                 return false;
 392         }
 393
 394         return true;
 395 }
 396
 397 /************************************************************************
 398  Decode the owner.
 399 ************************************************************************/
 400
 401 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
 402 {
 403         paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 404         switch( paie->owner_type) {
 405                 case UID_ACE:
 406                         paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 407                         DEBUG(10,("get_pai_owner_type: uid = %u\n",
 408                                 (unsigned int)paie->unix_ug.uid ));
 409                         break;
 410                 case GID_ACE:
 411                         paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 412                         DEBUG(10,("get_pai_owner_type: gid = %u\n",
 413                                 (unsigned int)paie->unix_ug.gid ));
 414                         break;
 415                 case WORLD_ACE:
 416                         paie->unix_ug.world = -1;
 417                         DEBUG(10,("get_pai_owner_type: world ace\n"));
 418                         break;
 419                 default:
 420                         DEBUG(10,("get_pai_owner_type: unknown type %u\n",
 421                                 (unsigned int)paie->owner_type ));
 422                         return false;
 423         }
 424         return true;
 425 }
 426
 427 /************************************************************************
 428  Process v2 entries.
 429 ************************************************************************/
 430
 431 static const char *create_pai_v1_entries(struct pai_val *paiv,
 432                                 const char *entry_offset,
 433                                 bool def_entry)
 434 {
 435         int i;
 436
 437         for (i = 0; i < paiv->num_entries; i++) {
 438                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 439                 if (!paie) {
 440                         return NULL;
 441                 }
 442
 443                 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
 444                 if (!get_pai_owner_type(paie, entry_offset)) {
 445                         return NULL;
 446                 }
 447
 448                 if (!def_entry) {
 449                         DLIST_ADD(paiv->entry_list, paie);
 450                 } else {
 451                         DLIST_ADD(paiv->def_entry_list, paie);
 452                 }
 453                 entry_offset += PAI_V1_ENTRY_LENGTH;
 454         }
 455         return entry_offset;
 456 }
 457
 458 /************************************************************************
 459  Convert to in-memory format from version 1.
 460 ************************************************************************/
 461
 462 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
 463 {
 464         const char *entry_offset;
 465         struct pai_val *paiv = NULL;
 466
 467         if (!check_pai_ok_v1(buf, size)) {
 468                 return NULL;
 469         }
 470
 471         paiv = SMB_MALLOC_P(struct pai_val);
 472         if (!paiv) {
 473                 return NULL;
 474         }
 475
 476         memset(paiv, '\0', sizeof(struct pai_val));
 477
 478         paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
 479                         SE_DESC_DACL_PROTECTED : 0;
 480
 481         paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
 482         paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 483
 484         entry_offset = buf + PAI_V1_ENTRIES_BASE;
 485
 486         DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
 487                         paiv->num_entries, paiv->num_def_entries ));
 488
 489         entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
 490         if (entry_offset == NULL) {
 491                 free_inherited_info(paiv);
 492                 return NULL;
 493         }
 494         entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
 495         if (entry_offset == NULL) {
 496                 free_inherited_info(paiv);
 497                 return NULL;
 498         }
 499
 500         return paiv;
 501 }
 502
 503 /************************************************************************
 504  Process v2 entries.
 505 ************************************************************************/
 506
 507 static const char *create_pai_v2_entries(struct pai_val *paiv,
 508                                 unsigned int num_entries,
 509                                 const char *entry_offset,
 510                                 bool def_entry)
 511 {
 512         unsigned int i;
 513
 514         for (i = 0; i < num_entries; i++) {
 515                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 516                 if (!paie) {
 517                         return NULL;
 518                 }
 519
 520                 paie->ace_flags = CVAL(entry_offset,0);
 521
 522                 if (!get_pai_owner_type(paie, entry_offset+1)) {
 523                         return NULL;
 524                 }
 525                 if (!def_entry) {
 526                         DLIST_ADD(paiv->entry_list, paie);
 527                 } else {
 528                         DLIST_ADD(paiv->def_entry_list, paie);
 529                 }
 530                 entry_offset += PAI_V2_ENTRY_LENGTH;
 531         }
 532         return entry_offset;
 533 }
 534
 535 /************************************************************************
 536  Convert to in-memory format from version 2.
 537 ************************************************************************/
 538
 539 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
 540 {
 541         const char *entry_offset;
 542         struct pai_val *paiv = NULL;
 543
 544         if (!check_pai_ok_v2(buf, size)) {
 545                 return NULL;
 546         }
 547
 548         paiv = SMB_MALLOC_P(struct pai_val);
 549         if (!paiv) {
 550                 return NULL;
 551         }
 552
 553         memset(paiv, '\0', sizeof(struct pai_val));
 554
 555         paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
 556
 557         paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
 558         paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 559
 560         entry_offset = buf + PAI_V2_ENTRIES_BASE;
 561
 562         DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
 563                         (unsigned int)paiv->sd_type,
 564                         paiv->num_entries, paiv->num_def_entries ));
 565
 566         entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
 567                                 entry_offset, false);
 568         if (entry_offset == NULL) {
 569                 free_inherited_info(paiv);
 570                 return NULL;
 571         }
 572         entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
 573                                 entry_offset, true);
 574         if (entry_offset == NULL) {
 575                 free_inherited_info(paiv);
 576                 return NULL;
 577         }
 578
 579         return paiv;
 580 }
 581
 582 /************************************************************************
 583  Convert to in-memory format - from either version 1 or 2.
 584 ************************************************************************/
 585
 586 static struct pai_val *create_pai_val(const char *buf, size_t size)
 587 {
 588         if (size < 1) {
 589                 return NULL;
 590         }
 591         if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
 592                 return create_pai_val_v1(buf, size);
 593         } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
 594                 return create_pai_val_v2(buf, size);
 595         } else {
 596                 return NULL;
 597         }
 598 }
 599
 600 /************************************************************************
 601  Load the user.SAMBA_PAI attribute.
 602 ************************************************************************/
 603
 604 static struct pai_val *fload_inherited_info(files_struct *fsp)
 605 {
 606         char *pai_buf;
 607         size_t pai_buf_size = 1024;
 608         struct pai_val *paiv = NULL;
 609         ssize_t ret;
 610
 611         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 612                 return NULL;
 613         }
 614
 615         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 616                 return NULL;
 617         }
 618
 619         do {
 620                 if (fsp->fh->fd != -1) {
 621                         ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 622                                         pai_buf, pai_buf_size);
 623                 } else {
 624                         ret = SMB_VFS_GETXATTR(fsp->conn,
 625                                                fsp->fsp_name->base_name,
 626                                                SAMBA_POSIX_INHERITANCE_EA_NAME,
 627                                                pai_buf, pai_buf_size);
 628                 }
 629
 630                 if (ret == -1) {
 631                         if (errno != ERANGE) {
 632                                 break;
 633                         }
 634                         /* Buffer too small - enlarge it. */
 635                         pai_buf_size *= 2;
 636                         SAFE_FREE(pai_buf);
 637                         if (pai_buf_size > 1024*1024) {
 638                                 return NULL; /* Limit malloc to 1mb. */
 639                         }
 640                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 641                                 return NULL;
 642                 }
 643         } while (ret == -1);
 644
 645         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
 646                   (unsigned long)ret, fsp_str_dbg(fsp)));
 647
 648         if (ret == -1) {
 649                 /* No attribute or not supported. */
 650 #if defined(ENOATTR)
 651                 if (errno != ENOATTR)
 652                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 653 #else
 654                 if (errno != ENOSYS)
 655                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 656 #endif
 657                 SAFE_FREE(pai_buf);
 658                 return NULL;
 659         }
 660
 661         paiv = create_pai_val(pai_buf, ret);
 662
 663         if (paiv) {
 664                 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
 665                           (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
 666         }
 667
 668         SAFE_FREE(pai_buf);
 669         return paiv;
 670 }
 671
 672 /************************************************************************
 673  Load the user.SAMBA_PAI attribute.
 674 ************************************************************************/
 675
 676 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
 677                                            const char *fname)
 678 {
 679         char *pai_buf;
 680         size_t pai_buf_size = 1024;
 681         struct pai_val *paiv = NULL;
 682         ssize_t ret;
 683
 684         if (!lp_map_acl_inherit(SNUM(conn))) {
 685                 return NULL;
 686         }
 687
 688         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 689                 return NULL;
 690         }
 691
 692         do {
 693                 ret = SMB_VFS_GETXATTR(conn, fname,
 694                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 695                                        pai_buf, pai_buf_size);
 696
 697                 if (ret == -1) {
 698                         if (errno != ERANGE) {
 699                                 break;
 700                         }
 701                         /* Buffer too small - enlarge it. */
 702                         pai_buf_size *= 2;
 703                         SAFE_FREE(pai_buf);
 704                         if (pai_buf_size > 1024*1024) {
 705                                 return NULL; /* Limit malloc to 1mb. */
 706                         }
 707                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 708                                 return NULL;
 709                 }
 710         } while (ret == -1);
 711
 712         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
 713
 714         if (ret == -1) {
 715                 /* No attribute or not supported. */
 716 #if defined(ENOATTR)
 717                 if (errno != ENOATTR)
 718                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 719 #else
 720                 if (errno != ENOSYS)
 721                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 722 #endif
 723                 SAFE_FREE(pai_buf);
 724                 return NULL;
 725         }
 726
 727         paiv = create_pai_val(pai_buf, ret);
 728
 729         if (paiv) {
 730                 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
 731                         (unsigned int)paiv->sd_type,
 732                         fname));
 733         }
 734
 735         SAFE_FREE(pai_buf);
 736         return paiv;
 737 }
 738
 739 /****************************************************************************
 740  Functions to manipulate the internal ACE format.
 741 ****************************************************************************/
 742
 743 /****************************************************************************
 744  Count a linked list of canonical ACE entries.
 745 ****************************************************************************/
 746
 747 static size_t count_canon_ace_list( canon_ace *l_head )
 748 {
 749         size_t count = 0;
 750         canon_ace *ace;
 751
 752         for (ace = l_head; ace; ace = ace->next)
 753                 count++;
 754
 755         return count;
 756 }
 757
 758 /****************************************************************************
 759  Free a linked list of canonical ACE entries.
 760 ****************************************************************************/
 761
 762 static void free_canon_ace_list( canon_ace *l_head )
 763 {
 764         canon_ace *list, *next;
 765
 766         for (list = l_head; list; list = next) {
 767                 next = list->next;
 768                 DLIST_REMOVE(l_head, list);
 769                 SAFE_FREE(list);
 770         }
 771 }
 772
 773 /****************************************************************************
 774  Function to duplicate a canon_ace entry.
 775 ****************************************************************************/
 776
 777 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 778 {
 779         canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
 780
 781         if (dst_ace == NULL)
 782                 return NULL;
 783
 784         *dst_ace = *src_ace;
 785         dst_ace->prev = dst_ace->next = NULL;
 786         return dst_ace;
 787 }
 788
 789 /****************************************************************************
 790  Print out a canon ace.
 791 ****************************************************************************/
 792
 793 static void print_canon_ace(canon_ace *pace, int num)
 794 {
 795         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 796         dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
 797         if (pace->owner_type == UID_ACE) {
 798                 const char *u_name = uidtoname(pace->unix_ug.uid);
 799                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
 800         } else if (pace->owner_type == GID_ACE) {
 801                 char *g_name = gidtoname(pace->unix_ug.gid);
 802                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
 803         } else
 804                 dbgtext( "other ");
 805         switch (pace->type) {
 806                 case SMB_ACL_USER:
 807                         dbgtext( "SMB_ACL_USER ");
 808                         break;
 809                 case SMB_ACL_USER_OBJ:
 810                         dbgtext( "SMB_ACL_USER_OBJ ");
 811                         break;
 812                 case SMB_ACL_GROUP:
 813                         dbgtext( "SMB_ACL_GROUP ");
 814                         break;
 815                 case SMB_ACL_GROUP_OBJ:
 816                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 817                         break;
 818                 case SMB_ACL_OTHER:
 819                         dbgtext( "SMB_ACL_OTHER ");
 820                         break;
 821                 default:
 822                         dbgtext( "MASK " );
 823                         break;
 824         }
 825
 826         dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
 827         dbgtext( "perms ");
 828         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 829         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 830         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 831 }
 832
 833 /****************************************************************************
 834  Print out a canon ace list.
 835 ****************************************************************************/
 836
 837 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 838 {
 839         int count = 0;
 840
 841         if( DEBUGLVL( 10 )) {
 842                 dbgtext( "print_canon_ace_list: %s\n", name );
 843                 for (;ace_list; ace_list = ace_list->next, count++)
 844                         print_canon_ace(ace_list, count );
 845         }
 846 }
 847
 848 /****************************************************************************
 849  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 850 ****************************************************************************/
 851
 852 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
 853 {
 854         mode_t ret = 0;
 855
 856         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
 857         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 858         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 859
 860         return ret;
 861 }
 862
 863 /****************************************************************************
 864  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 865 ****************************************************************************/
 866
 867 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 868 {
 869         mode_t ret = 0;
 870
 871         if (mode & r_mask)
 872                 ret |= S_IRUSR;
 873         if (mode & w_mask)
 874                 ret |= S_IWUSR;
 875         if (mode & x_mask)
 876                 ret |= S_IXUSR;
 877
 878         return ret;
 879 }
 880
 881 /****************************************************************************
 882  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 883  an SMB_ACL_PERMSET_T.
 884 ****************************************************************************/
 885
 886 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 887 {
 888         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1)
 889                 return -1;
 890         if (mode & S_IRUSR) {
 891                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
 892                         return -1;
 893         }
 894         if (mode & S_IWUSR) {
 895                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
 896                         return -1;
 897         }
 898         if (mode & S_IXUSR) {
 899                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
 900                         return -1;
 901         }
 902         return 0;
 903 }
 904
 905 /****************************************************************************
 906  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 907 ****************************************************************************/
 908
 909 void create_file_sids(const SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
 910 {
 911         uid_to_sid( powner_sid, psbuf->st_ex_uid );
 912         gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
 913 }
 914
 915 /****************************************************************************
 916  Merge aces with a common sid - if both are allow or deny, OR the permissions together and
 917  delete the second one. If the first is deny, mask the permissions off and delete the allow
 918  if the permissions become zero, delete the deny if the permissions are non zero.
 919 ****************************************************************************/
 920
 921 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
 922 {
 923         canon_ace *l_head = *pp_list_head;
 924         canon_ace *curr_ace_outer;
 925         canon_ace *curr_ace_outer_next;
 926
 927         /*
 928          * First, merge allow entries with identical SIDs, and deny entries
 929          * with identical SIDs.
 930          */
 931
 932         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 933                 canon_ace *curr_ace;
 934                 canon_ace *curr_ace_next;
 935
 936                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 937
 938                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 939                         bool can_merge = false;
 940
 941                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 942
 943                         /* For file ACLs we can merge if the SIDs and ALLOW/DENY
 944                          * types are the same. For directory acls we must also
 945                          * ensure the POSIX ACL types are the same. */
 946
 947                         if (!dir_acl) {
 948                                 can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 949                                                 (curr_ace->attr == curr_ace_outer->attr));
 950                         } else {
 951                                 can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 952                                                 (curr_ace->type == curr_ace_outer->type) &&
 953                                                 (curr_ace->attr == curr_ace_outer->attr));
 954                         }
 955
 956                         if (can_merge) {
 957                                 if( DEBUGLVL( 10 )) {
 958                                         dbgtext("merge_aces: Merging ACE's\n");
 959                                         print_canon_ace( curr_ace_outer, 0);
 960                                         print_canon_ace( curr_ace, 0);
 961                                 }
 962
 963                                 /* Merge two allow or two deny ACE's. */
 964
 965                                 /* Theoretically we shouldn't merge a dir ACE if
 966                                  * one ACE has the CI flag set, and the other
 967                                  * ACE has the OI flag set, but this is rare
 968                                  * enough we can ignore it. */
 969
 970                                 curr_ace_outer->perms |= curr_ace->perms;
 971                                 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
 972                                 DLIST_REMOVE(l_head, curr_ace);
 973                                 SAFE_FREE(curr_ace);
 974                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 975                         }
 976                 }
 977         }
 978
 979         /*
 980          * Now go through and mask off allow permissions with deny permissions.
 981          * We can delete either the allow or deny here as we know that each SID
 982          * appears only once in the list.
 983          */
 984
 985         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 986                 canon_ace *curr_ace;
 987                 canon_ace *curr_ace_next;
 988
 989                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 990
 991                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 992
 993                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 994
 995                         /*
 996                          * Subtract ACE's with different entries. Due to the ordering constraints
 997                          * we've put on the ACL, we know the deny must be the first one.
 998                          */
 999
1000                         if (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1001                                 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1002
1003                                 if( DEBUGLVL( 10 )) {
1004                                         dbgtext("merge_aces: Masking ACE's\n");
1005                                         print_canon_ace( curr_ace_outer, 0);
1006                                         print_canon_ace( curr_ace, 0);
1007                                 }
1008
1009                                 curr_ace->perms &= ~curr_ace_outer->perms;
1010
1011                                 if (curr_ace->perms == 0) {
1012
1013                                         /*
1014                                          * The deny overrides the allow. Remove the allow.
1015                                          */
1016
1017                                         DLIST_REMOVE(l_head, curr_ace);
1018                                         SAFE_FREE(curr_ace);
1019                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1020
1021                                 } else {
1022
1023                                         /*
1024                                          * Even after removing permissions, there
1025                                          * are still allow permissions - delete the deny.
1026                                          * It is safe to delete the deny here,
1027                                          * as we are guarenteed by the deny first
1028                                          * ordering that all the deny entries for
1029                                          * this SID have already been merged into one
1030                                          * before we can get to an allow ace.
1031                                          */
1032
1033                                         DLIST_REMOVE(l_head, curr_ace_outer);
1034                                         SAFE_FREE(curr_ace_outer);
1035                                         break;
1036                                 }
1037                         }
1038
1039                 } /* end for curr_ace */
1040         } /* end for curr_ace_outer */
1041
1042         /* We may have modified the list. */
1043
1044         *pp_list_head = l_head;
1045 }
1046
1047 /****************************************************************************
1048  Check if we need to return NT4.x compatible ACL entries.
1049 ****************************************************************************/
1050
1051 bool nt4_compatible_acls(void)
1052 {
1053         int compat = lp_acl_compatibility();
1054
1055         if (compat == ACL_COMPAT_AUTO) {
1056                 enum remote_arch_types ra_type = get_remote_arch();
1057
1058                 /* Automatically adapt to client */
1059                 return (ra_type <= RA_WINNT);
1060         } else
1061                 return (compat == ACL_COMPAT_WINNT);
1062 }
1063
1064
1065 /****************************************************************************
1066  Map canon_ace perms to permission bits NT.
1067  The attr element is not used here - we only process deny entries on set,
1068  not get. Deny entries are implicit on get with ace->perms = 0.
1069 ****************************************************************************/
1070
1071 uint32_t map_canon_ace_perms(int snum,
1072                                 enum security_ace_type *pacl_type,
1073                                 mode_t perms,
1074                                 bool directory_ace)
1075 {
1076         uint32_t nt_mask = 0;
1077
1078         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1079
1080         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1081                 if (directory_ace) {
1082                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1083                 } else {
1084                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1085                 }
1086         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1087                 /*
1088                  * Windows NT refuses to display ACEs with no permissions in them (but
1089                  * they are perfectly legal with Windows 2000). If the ACE has empty
1090                  * permissions we cannot use 0, so we use the otherwise unused
1091                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1092                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1093                  * to be changed in the future.
1094                  */
1095
1096                 if (nt4_compatible_acls())
1097                         nt_mask = UNIX_ACCESS_NONE;
1098                 else
1099                         nt_mask = 0;
1100         } else {
1101                 if (directory_ace) {
1102                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1103                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1104                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1105                 } else {
1106                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1107                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1108                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1109                 }
1110         }
1111
1112         if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1113                 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1114         }
1115
1116         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1117                         (unsigned int)perms, (unsigned int)nt_mask ));
1118
1119         return nt_mask;
1120 }
1121
1122 /****************************************************************************
1123  Map NT perms to a UNIX mode_t.
1124 ****************************************************************************/
1125
1126 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
1127 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
1128 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1129
1130 static mode_t map_nt_perms( uint32 *mask, int type)
1131 {
1132         mode_t mode = 0;
1133
1134         switch(type) {
1135         case S_IRUSR:
1136                 if((*mask) & GENERIC_ALL_ACCESS)
1137                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1138                 else {
1139                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1140                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1141                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1142                 }
1143                 break;
1144         case S_IRGRP:
1145                 if((*mask) & GENERIC_ALL_ACCESS)
1146                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1147                 else {
1148                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1149                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1150                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1151                 }
1152                 break;
1153         case S_IROTH:
1154                 if((*mask) & GENERIC_ALL_ACCESS)
1155                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1156                 else {
1157                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1158                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1159                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1160                 }
1161                 break;
1162         }
1163
1164         return mode;
1165 }
1166
1167 /****************************************************************************
1168  Unpack a SEC_DESC into a UNIX owner and group.
1169 ****************************************************************************/
1170
1171 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd)
1172 {
1173         DOM_SID owner_sid;
1174         DOM_SID grp_sid;
1175
1176         *puser = (uid_t)-1;
1177         *pgrp = (gid_t)-1;
1178
1179         if(security_info_sent == 0) {
1180                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1181                 return NT_STATUS_OK;
1182         }
1183
1184         /*
1185          * Validate the owner and group SID's.
1186          */
1187
1188         memset(&owner_sid, '\0', sizeof(owner_sid));
1189         memset(&grp_sid, '\0', sizeof(grp_sid));
1190
1191         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1192
1193         /*
1194          * Don't immediately fail if the owner sid cannot be validated.
1195          * This may be a group chown only set.
1196          */
1197
1198         if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1199                 sid_copy(&owner_sid, psd->owner_sid);
1200                 if (!sid_to_uid(&owner_sid, puser)) {
1201                         if (lp_force_unknown_acl_user(snum)) {
1202                                 /* this allows take ownership to work
1203                                  * reasonably */
1204                                 *puser = current_user.ut.uid;
1205                         } else {
1206                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1207                                          " owner sid for %s\n",
1208                                          sid_string_dbg(&owner_sid)));
1209                                 return NT_STATUS_INVALID_OWNER;
1210                         }
1211                 }
1212                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1213                          (unsigned int)*puser ));
1214         }
1215
1216         /*
1217          * Don't immediately fail if the group sid cannot be validated.
1218          * This may be an owner chown only set.
1219          */
1220
1221         if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1222                 sid_copy(&grp_sid, psd->group_sid);
1223                 if (!sid_to_gid( &grp_sid, pgrp)) {
1224                         if (lp_force_unknown_acl_user(snum)) {
1225                                 /* this allows take group ownership to work
1226                                  * reasonably */
1227                                 *pgrp = current_user.ut.gid;
1228                         } else {
1229                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1230                                          " group sid.\n"));
1231                                 return NT_STATUS_INVALID_OWNER;
1232                         }
1233                 }
1234                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1235                          (unsigned int)*pgrp));
1236         }
1237
1238         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1239
1240         return NT_STATUS_OK;
1241 }
1242
1243 /****************************************************************************
1244  Ensure the enforced permissions for this share apply.
1245 ****************************************************************************/
1246
1247 static void apply_default_perms(const struct share_params *params,
1248                                 const bool is_directory, canon_ace *pace,
1249                                 mode_t type)
1250 {
1251         mode_t and_bits = (mode_t)0;
1252         mode_t or_bits = (mode_t)0;
1253
1254         /* Get the initial bits to apply. */
1255
1256         if (is_directory) {
1257                 and_bits = lp_dir_security_mask(params->service);
1258                 or_bits = lp_force_dir_security_mode(params->service);
1259         } else {
1260                 and_bits = lp_security_mask(params->service);
1261                 or_bits = lp_force_security_mode(params->service);
1262         }
1263
1264         /* Now bounce them into the S_USR space. */
1265         switch(type) {
1266         case S_IRUSR:
1267                 /* Ensure owner has read access. */
1268                 pace->perms |= S_IRUSR;
1269                 if (is_directory)
1270                         pace->perms |= (S_IWUSR|S_IXUSR);
1271                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1272                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1273                 break;
1274         case S_IRGRP:
1275                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1276                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1277                 break;
1278         case S_IROTH:
1279                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1280                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1281                 break;
1282         }
1283
1284         pace->perms = ((pace->perms & and_bits)|or_bits);
1285 }
1286
1287 /****************************************************************************
1288  Check if a given uid/SID is in a group gid/SID. This is probably very
1289  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1290 ****************************************************************************/
1291
1292 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1293 {
1294         const char *u_name = NULL;
1295
1296         /* "Everyone" always matches every uid. */
1297
1298         if (sid_equal(&group_ace->trustee, &global_sid_World))
1299                 return True;
1300
1301         /*
1302          * if it's the current user, we already have the unix token
1303          * and don't need to do the complex user_in_group_sid() call
1304          */
1305         if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1306                 size_t i;
1307
1308                 if (group_ace->unix_ug.gid == current_user.ut.gid) {
1309                         return True;
1310                 }
1311
1312                 for (i=0; i < current_user.ut.ngroups; i++) {
1313                         if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1314                                 return True;
1315                         }
1316                 }
1317         }
1318
1319         /* u_name talloc'ed off tos. */
1320         u_name = uidtoname(uid_ace->unix_ug.uid);
1321         if (!u_name) {
1322                 return False;
1323         }
1324
1325         /*
1326          * user_in_group_sid() uses create_token_from_username()
1327          * which creates an artificial NT token given just a username,
1328          * so this is not reliable for users from foreign domains
1329          * exported by winbindd!
1330          */
1331         return user_in_group_sid(u_name, &group_ace->trustee);
1332 }
1333
1334 /****************************************************************************
1335  A well formed POSIX file or default ACL has at least 3 entries, a
1336  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1337  In addition, the owner must always have at least read access.
1338  When using this call on get_acl, the pst struct is valid and contains
1339  the mode of the file. When using this call on set_acl, the pst struct has
1340  been modified to have a mode containing the default for this file or directory
1341  type.
1342 ****************************************************************************/
1343
1344 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1345                                      const struct share_params *params,
1346                                      const bool is_directory,
1347                                                         const DOM_SID *pfile_owner_sid,
1348                                                         const DOM_SID *pfile_grp_sid,
1349                                                         const SMB_STRUCT_STAT *pst,
1350                                                         bool setting_acl)
1351 {
1352         canon_ace *pace;
1353         bool got_user = False;
1354         bool got_grp = False;
1355         bool got_other = False;
1356         canon_ace *pace_other = NULL;
1357
1358         for (pace = *pp_ace; pace; pace = pace->next) {
1359                 if (pace->type == SMB_ACL_USER_OBJ) {
1360
1361                         if (setting_acl)
1362                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1363                         got_user = True;
1364
1365                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1366
1367                         /*
1368                          * Ensure create mask/force create mode is respected on set.
1369                          */
1370
1371                         if (setting_acl)
1372                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1373                         got_grp = True;
1374
1375                 } else if (pace->type == SMB_ACL_OTHER) {
1376
1377                         /*
1378                          * Ensure create mask/force create mode is respected on set.
1379                          */
1380
1381                         if (setting_acl)
1382                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1383                         got_other = True;
1384                         pace_other = pace;
1385                 }
1386         }
1387
1388         if (!got_user) {
1389                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1390                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1391                         return False;
1392                 }
1393
1394                 ZERO_STRUCTP(pace);
1395                 pace->type = SMB_ACL_USER_OBJ;
1396                 pace->owner_type = UID_ACE;
1397                 pace->unix_ug.uid = pst->st_ex_uid;
1398                 pace->trustee = *pfile_owner_sid;
1399                 pace->attr = ALLOW_ACE;
1400
1401                 if (setting_acl) {
1402                         /* See if the owning user is in any of the other groups in
1403                            the ACE. If so, OR in the permissions from that group. */
1404
1405                         bool group_matched = False;
1406                         canon_ace *pace_iter;
1407
1408                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1409                                 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1410                                         if (uid_entry_in_group(pace, pace_iter)) {
1411                                                 pace->perms |= pace_iter->perms;
1412                                                 group_matched = True;
1413                                         }
1414                                 }
1415                         }
1416
1417                         /* If we only got an "everyone" perm, just use that. */
1418                         if (!group_matched) {
1419                                 if (got_other)
1420                                         pace->perms = pace_other->perms;
1421                                 else
1422                                         pace->perms = 0;
1423                         }
1424
1425                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1426                 } else {
1427                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1428                 }
1429
1430                 DLIST_ADD(*pp_ace, pace);
1431         }
1432
1433         if (!got_grp) {
1434                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1435                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1436                         return False;
1437                 }
1438
1439                 ZERO_STRUCTP(pace);
1440                 pace->type = SMB_ACL_GROUP_OBJ;
1441                 pace->owner_type = GID_ACE;
1442                 pace->unix_ug.uid = pst->st_ex_gid;
1443                 pace->trustee = *pfile_grp_sid;
1444                 pace->attr = ALLOW_ACE;
1445                 if (setting_acl) {
1446                         /* If we only got an "everyone" perm, just use that. */
1447                         if (got_other)
1448                                 pace->perms = pace_other->perms;
1449                         else
1450                                 pace->perms = 0;
1451                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1452                 } else {
1453                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1454                 }
1455
1456                 DLIST_ADD(*pp_ace, pace);
1457         }
1458
1459         if (!got_other) {
1460                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1461                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1462                         return False;
1463                 }
1464
1465                 ZERO_STRUCTP(pace);
1466                 pace->type = SMB_ACL_OTHER;
1467                 pace->owner_type = WORLD_ACE;
1468                 pace->unix_ug.world = -1;
1469                 pace->trustee = global_sid_World;
1470                 pace->attr = ALLOW_ACE;
1471                 if (setting_acl) {
1472                         pace->perms = 0;
1473                         apply_default_perms(params, is_directory, pace, S_IROTH);
1474                 } else
1475                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1476
1477                 DLIST_ADD(*pp_ace, pace);
1478         }
1479
1480         return True;
1481 }
1482
1483 /****************************************************************************
1484  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1485  If it does not have them, check if there are any entries where the trustee is the
1486  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1487 ****************************************************************************/
1488
1489 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1490 {
1491         bool got_user_obj, got_group_obj;
1492         canon_ace *current_ace;
1493         int i, entries;
1494
1495         entries = count_canon_ace_list(ace);
1496         got_user_obj = False;
1497         got_group_obj = False;
1498
1499         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1500                 if (current_ace->type == SMB_ACL_USER_OBJ)
1501                         got_user_obj = True;
1502                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1503                         got_group_obj = True;
1504         }
1505         if (got_user_obj && got_group_obj) {
1506                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1507                 return;
1508         }
1509
1510         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1511                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1512                                 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1513                         current_ace->type = SMB_ACL_USER_OBJ;
1514                         got_user_obj = True;
1515                 }
1516                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1517                                 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1518                         current_ace->type = SMB_ACL_GROUP_OBJ;
1519                         got_group_obj = True;
1520                 }
1521         }
1522         if (!got_user_obj)
1523                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1524         if (!got_group_obj)
1525                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1526 }
1527
1528 /****************************************************************************
1529  Unpack a SEC_DESC into two canonical ace lists.
1530 ****************************************************************************/
1531
1532 static bool create_canon_ace_lists(files_struct *fsp,
1533                                         const SMB_STRUCT_STAT *pst,
1534                                         DOM_SID *pfile_owner_sid,
1535                                         DOM_SID *pfile_grp_sid,
1536                                         canon_ace **ppfile_ace,
1537                                         canon_ace **ppdir_ace,
1538                                         const SEC_ACL *dacl)
1539 {
1540         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1541         canon_ace *file_ace = NULL;
1542         canon_ace *dir_ace = NULL;
1543         canon_ace *current_ace = NULL;
1544         bool got_dir_allow = False;
1545         bool got_file_allow = False;
1546         int i, j;
1547
1548         *ppfile_ace = NULL;
1549         *ppdir_ace = NULL;
1550
1551         /*
1552          * Convert the incoming ACL into a more regular form.
1553          */
1554
1555         for(i = 0; i < dacl->num_aces; i++) {
1556                 SEC_ACE *psa = &dacl->aces[i];
1557
1558                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1559                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1560                         return False;
1561                 }
1562
1563                 if (nt4_compatible_acls()) {
1564                         /*
1565                          * The security mask may be UNIX_ACCESS_NONE which should map into
1566                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1567                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1568                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1569                          */
1570
1571                         /*
1572                          * Convert GENERIC bits to specific bits.
1573                          */
1574
1575                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1576
1577                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1578
1579                         if(psa->access_mask != UNIX_ACCESS_NONE)
1580                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1581                 }
1582         }
1583
1584         /*
1585          * Deal with the fact that NT 4.x re-writes the canonical format
1586          * that we return for default ACLs. If a directory ACE is identical
1587          * to a inherited directory ACE then NT changes the bits so that the
1588          * first ACE is set to OI|IO and the second ACE for this SID is set
1589          * to CI. We need to repair this. JRA.
1590          */
1591
1592         for(i = 0; i < dacl->num_aces; i++) {
1593                 SEC_ACE *psa1 = &dacl->aces[i];
1594
1595                 for (j = i + 1; j < dacl->num_aces; j++) {
1596                         SEC_ACE *psa2 = &dacl->aces[j];
1597
1598                         if (psa1->access_mask != psa2->access_mask)
1599                                 continue;
1600
1601                         if (!sid_equal(&psa1->trustee, &psa2->trustee))
1602                                 continue;
1603
1604                         /*
1605                          * Ok - permission bits and SIDs are equal.
1606                          * Check if flags were re-written.
1607                          */
1608
1609                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1610
1611                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1612                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1613
1614                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1615
1616                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1617                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1618
1619                         }
1620                 }
1621         }
1622
1623         for(i = 0; i < dacl->num_aces; i++) {
1624                 SEC_ACE *psa = &dacl->aces[i];
1625
1626                 /*
1627                  * Create a cannon_ace entry representing this NT DACL ACE.
1628                  */
1629
1630                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1631                         free_canon_ace_list(file_ace);
1632                         free_canon_ace_list(dir_ace);
1633                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1634                         return False;
1635                 }
1636
1637                 ZERO_STRUCTP(current_ace);
1638
1639                 sid_copy(&current_ace->trustee, &psa->trustee);
1640
1641                 /*
1642                  * Try and work out if the SID is a user or group
1643                  * as we need to flag these differently for POSIX.
1644                  * Note what kind of a POSIX ACL this should map to.
1645                  */
1646
1647                 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1648                         current_ace->owner_type = WORLD_ACE;
1649                         current_ace->unix_ug.world = -1;
1650                         current_ace->type = SMB_ACL_OTHER;
1651                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1652                         current_ace->owner_type = UID_ACE;
1653                         current_ace->unix_ug.uid = pst->st_ex_uid;
1654                         current_ace->type = SMB_ACL_USER_OBJ;
1655
1656                         /*
1657                          * The Creator Owner entry only specifies inheritable permissions,
1658                          * never access permissions. WinNT doesn't always set the ACE to
1659                          * INHERIT_ONLY, though.
1660                          */
1661
1662                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1663
1664                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1665                         current_ace->owner_type = GID_ACE;
1666                         current_ace->unix_ug.gid = pst->st_ex_gid;
1667                         current_ace->type = SMB_ACL_GROUP_OBJ;
1668
1669                         /*
1670                          * The Creator Group entry only specifies inheritable permissions,
1671                          * never access permissions. WinNT doesn't always set the ACE to
1672                          * INHERIT_ONLY, though.
1673                          */
1674                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1675
1676                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1677                         current_ace->owner_type = UID_ACE;
1678                         /* If it's the owning user, this is a user_obj, not
1679                          * a user. */
1680                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1681                                 current_ace->type = SMB_ACL_USER_OBJ;
1682                         } else {
1683                                 current_ace->type = SMB_ACL_USER;
1684                         }
1685                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1686                         current_ace->owner_type = GID_ACE;
1687                         /* If it's the primary group, this is a group_obj, not
1688                          * a group. */
1689                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1690                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1691                         } else {
1692                                 current_ace->type = SMB_ACL_GROUP;
1693                         }
1694                 } else {
1695                         /*
1696                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1697                          */
1698
1699                         if (non_mappable_sid(&psa->trustee)) {
1700                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1701                                            "non-mappable SID %s\n",
1702                                            sid_string_dbg(&psa->trustee)));
1703                                 SAFE_FREE(current_ace);
1704                                 continue;
1705                         }
1706
1707                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1708                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1709                                         "unknown or foreign SID %s\n",
1710                                         sid_string_dbg(&psa->trustee)));
1711                                         SAFE_FREE(current_ace);
1712                                 continue;
1713                         }
1714
1715                         free_canon_ace_list(file_ace);
1716                         free_canon_ace_list(dir_ace);
1717                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1718                                   "%s to uid or gid.\n",
1719                                   sid_string_dbg(&current_ace->trustee)));
1720                         SAFE_FREE(current_ace);
1721                         return False;
1722                 }
1723
1724                 /*
1725                  * Map the given NT permissions into a UNIX mode_t containing only
1726                  * S_I(R|W|X)USR bits.
1727                  */
1728
1729                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1730                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1731
1732                 /* Store the ace_flag. */
1733                 current_ace->ace_flags = psa->flags;
1734
1735                 /*
1736                  * Now add the created ace to either the file list, the directory
1737                  * list, or both. We *MUST* preserve the order here (hence we use
1738                  * DLIST_ADD_END) as NT ACLs are order dependent.
1739                  */
1740
1741                 if (fsp->is_directory) {
1742
1743                         /*
1744                          * We can only add to the default POSIX ACE list if the ACE is
1745                          * designed to be inherited by both files and directories.
1746                          */
1747
1748                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1749                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1750
1751                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1752
1753                                 /*
1754                                  * Note if this was an allow ace. We can't process
1755                                  * any further deny ace's after this.
1756                                  */
1757
1758                                 if (current_ace->attr == ALLOW_ACE)
1759                                         got_dir_allow = True;
1760
1761                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1762                                         DEBUG(0,("create_canon_ace_lists: "
1763                                                  "malformed ACL in "
1764                                                  "inheritable ACL! Deny entry "
1765                                                  "after Allow entry. Failing "
1766                                                  "to set on file %s.\n",
1767                                                  fsp_str_dbg(fsp)));
1768                                         free_canon_ace_list(file_ace);
1769                                         free_canon_ace_list(dir_ace);
1770                                         return False;
1771                                 }
1772
1773                                 if( DEBUGLVL( 10 )) {
1774                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1775                                         print_canon_ace( current_ace, 0);
1776                                 }
1777
1778                                 /*
1779                                  * If this is not an inherit only ACE we need to add a duplicate
1780                                  * to the file acl.
1781                                  */
1782
1783                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1784                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1785
1786                                         if (!dup_ace) {
1787                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1788                                                 free_canon_ace_list(file_ace);
1789                                                 free_canon_ace_list(dir_ace);
1790                                                 return False;
1791                                         }
1792
1793                                         /*
1794                                          * We must not free current_ace here as its
1795                                          * pointer is now owned by the dir_ace list.
1796                                          */
1797                                         current_ace = dup_ace;
1798                                         /* We've essentially split this ace into two,
1799                                          * and added the ace with inheritance request
1800                                          * bits to the directory ACL. Drop those bits for
1801                                          * the ACE we're adding to the file list. */
1802                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1803                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1804                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1805                                 } else {
1806                                         /*
1807                                          * We must not free current_ace here as its
1808                                          * pointer is now owned by the dir_ace list.
1809                                          */
1810                                         current_ace = NULL;
1811                                 }
1812                         }
1813                 }
1814
1815                 /*
1816                  * Only add to the file ACL if not inherit only.
1817                  */
1818
1819                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1820                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1821
1822                         /*
1823                          * Note if this was an allow ace. We can't process
1824                          * any further deny ace's after this.
1825                          */
1826
1827                         if (current_ace->attr == ALLOW_ACE)
1828                                 got_file_allow = True;
1829
1830                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1831                                 DEBUG(0,("create_canon_ace_lists: malformed "
1832                                          "ACL in file ACL ! Deny entry after "
1833                                          "Allow entry. Failing to set on file "
1834                                          "%s.\n", fsp_str_dbg(fsp)));
1835                                 free_canon_ace_list(file_ace);
1836                                 free_canon_ace_list(dir_ace);
1837                                 return False;
1838                         }
1839
1840                         if( DEBUGLVL( 10 )) {
1841                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1842                                 print_canon_ace( current_ace, 0);
1843                         }
1844                         all_aces_are_inherit_only = False;
1845                         /*
1846                          * We must not free current_ace here as its
1847                          * pointer is now owned by the file_ace list.
1848                          */
1849                         current_ace = NULL;
1850                 }
1851
1852                 /*
1853                  * Free if ACE was not added.
1854                  */
1855
1856                 SAFE_FREE(current_ace);
1857         }
1858
1859         if (fsp->is_directory && all_aces_are_inherit_only) {
1860                 /*
1861                  * Windows 2000 is doing one of these weird 'inherit acl'
1862                  * traverses to conserve NTFS ACL resources. Just pretend
1863                  * there was no DACL sent. JRA.
1864                  */
1865
1866                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1867                 free_canon_ace_list(file_ace);
1868                 free_canon_ace_list(dir_ace);
1869                 file_ace = NULL;
1870                 dir_ace = NULL;
1871         } else {
1872                 /*
1873                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1874                  * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1875                  * entries can be converted to *_OBJ. Usually we will already have these
1876                  * entries in the Default ACL, and the Access ACL will not have them.
1877                  */
1878                 if (file_ace) {
1879                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1880                 }
1881                 if (dir_ace) {
1882                         check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1883                 }
1884         }
1885
1886         *ppfile_ace = file_ace;
1887         *ppdir_ace = dir_ace;
1888
1889         return True;
1890 }
1891
1892 /****************************************************************************
1893  ASCII art time again... JRA :-).
1894
1895  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1896  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1897  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1898  allow or deny have been merged, so the same SID can only appear once in the deny
1899  list or once in the allow list.
1900
1901  We then process as follows :
1902
1903  ---------------------------------------------------------------------------
1904  First pass - look for a Everyone DENY entry.
1905
1906  If it is deny all (rwx) trunate the list at this point.
1907  Else, walk the list from this point and use the deny permissions of this
1908  entry as a mask on all following allow entries. Finally, delete
1909  the Everyone DENY entry (we have applied it to everything possible).
1910
1911  In addition, in this pass we remove any DENY entries that have
1912  no permissions (ie. they are a DENY nothing).
1913  ---------------------------------------------------------------------------
1914  Second pass - only deal with deny user entries.
1915
1916  DENY user1 (perms XXX)
1917
1918  new_perms = 0
1919  for all following allow group entries where user1 is in group
1920         new_perms |= group_perms;
1921
1922  user1 entry perms = new_perms & ~ XXX;
1923
1924  Convert the deny entry to an allow entry with the new perms and
1925  push to the end of the list. Note if the user was in no groups
1926  this maps to a specific allow nothing entry for this user.
1927
1928  The common case from the NT ACL choser (userX deny all) is
1929  optimised so we don't do the group lookup - we just map to
1930  an allow nothing entry.
1931
1932  What we're doing here is inferring the allow permissions the
1933  person setting the ACE on user1 wanted by looking at the allow
1934  permissions on the groups the user is currently in. This will
1935  be a snapshot, depending on group membership but is the best
1936  we can do and has the advantage of failing closed rather than
1937  open.
1938  ---------------------------------------------------------------------------
1939  Third pass - only deal with deny group entries.
1940
1941  DENY group1 (perms XXX)
1942
1943  for all following allow user entries where user is in group1
1944    user entry perms = user entry perms & ~ XXX;
1945
1946  If there is a group Everyone allow entry with permissions YYY,
1947  convert the group1 entry to an allow entry and modify its
1948  permissions to be :
1949
1950  new_perms = YYY & ~ XXX
1951
1952  and push to the end of the list.
1953
1954  If there is no group Everyone allow entry then convert the
1955  group1 entry to a allow nothing entry and push to the end of the list.
1956
1957  Note that the common case from the NT ACL choser (groupX deny all)
1958  cannot be optimised here as we need to modify user entries who are
1959  in the group to change them to a deny all also.
1960
1961  What we're doing here is modifying the allow permissions of
1962  user entries (which are more specific in POSIX ACLs) to mask
1963  out the explicit deny set on the group they are in. This will
1964  be a snapshot depending on current group membership but is the
1965  best we can do and has the advantage of failing closed rather
1966  than open.
1967  ---------------------------------------------------------------------------
1968  Fourth pass - cope with cumulative permissions.
1969
1970  for all allow user entries, if there exists an allow group entry with
1971  more permissive permissions, and the user is in that group, rewrite the
1972  allow user permissions to contain both sets of permissions.
1973
1974  Currently the code for this is #ifdef'ed out as these semantics make
1975  no sense to me. JRA.
1976  ---------------------------------------------------------------------------
1977
1978  Note we *MUST* do the deny user pass first as this will convert deny user
1979  entries into allow user entries which can then be processed by the deny
1980  group pass.
1981
1982  The above algorithm took a *lot* of thinking about - hence this
1983  explaination :-). JRA.
1984 ****************************************************************************/
1985
1986 /****************************************************************************
1987  Process a canon_ace list entries. This is very complex code. We need
1988  to go through and remove the "deny" permissions from any allow entry that matches
1989  the id of this entry. We have already refused any NT ACL that wasn't in correct
1990  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1991  we just remove it (to fail safe). We have already removed any duplicate ace
1992  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1993  allow entries.
1994 ****************************************************************************/
1995
1996 static void process_deny_list( canon_ace **pp_ace_list )
1997 {
1998         canon_ace *ace_list = *pp_ace_list;
1999         canon_ace *curr_ace = NULL;
2000         canon_ace *curr_ace_next = NULL;
2001
2002         /* Pass 1 above - look for an Everyone, deny entry. */
2003
2004         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2005                 canon_ace *allow_ace_p;
2006
2007                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2008
2009                 if (curr_ace->attr != DENY_ACE)
2010                         continue;
2011
2012                 if (curr_ace->perms == (mode_t)0) {
2013
2014                         /* Deny nothing entry - delete. */
2015
2016                         DLIST_REMOVE(ace_list, curr_ace);
2017                         continue;
2018                 }
2019
2020                 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2021                         continue;
2022
2023                 /* JRATEST - assert. */
2024                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2025
2026                 if (curr_ace->perms == ALL_ACE_PERMS) {
2027
2028                         /*
2029                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2030                          * list at this point including this entry.
2031                          */
2032
2033                         canon_ace *prev_entry = curr_ace->prev;
2034
2035                         free_canon_ace_list( curr_ace );
2036                         if (prev_entry)
2037                                 prev_entry->next = NULL;
2038                         else {
2039                                 /* We deleted the entire list. */
2040                                 ace_list = NULL;
2041                         }
2042                         break;
2043                 }
2044
2045                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2046
2047                         /*
2048                          * Only mask off allow entries.
2049                          */
2050
2051                         if (allow_ace_p->attr != ALLOW_ACE)
2052                                 continue;
2053
2054                         allow_ace_p->perms &= ~curr_ace->perms;
2055                 }
2056
2057                 /*
2058                  * Now it's been applied, remove it.
2059                  */
2060
2061                 DLIST_REMOVE(ace_list, curr_ace);
2062         }
2063
2064         /* Pass 2 above - deal with deny user entries. */
2065
2066         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2067                 mode_t new_perms = (mode_t)0;
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->owner_type != UID_ACE)
2076                         continue;
2077
2078                 if (curr_ace->perms == ALL_ACE_PERMS) {
2079
2080                         /*
2081                          * Optimisation - this is a deny everything to this user.
2082                          * Convert to an allow nothing and push to the end of the list.
2083                          */
2084
2085                         curr_ace->attr = ALLOW_ACE;
2086                         curr_ace->perms = (mode_t)0;
2087                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2088                         continue;
2089                 }
2090
2091                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2092
2093                         if (allow_ace_p->attr != ALLOW_ACE)
2094                                 continue;
2095
2096                         /* We process GID_ACE and WORLD_ACE entries only. */
2097
2098                         if (allow_ace_p->owner_type == UID_ACE)
2099                                 continue;
2100
2101                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2102                                 new_perms |= allow_ace_p->perms;
2103                 }
2104
2105                 /*
2106                  * Convert to a allow entry, modify the perms and push to the end
2107                  * of the list.
2108                  */
2109
2110                 curr_ace->attr = ALLOW_ACE;
2111                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2112                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2113         }
2114
2115         /* Pass 3 above - deal with deny group entries. */
2116
2117         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2118                 canon_ace *allow_ace_p;
2119                 canon_ace *allow_everyone_p = NULL;
2120
2121                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2122
2123                 if (curr_ace->attr != DENY_ACE)
2124                         continue;
2125
2126                 if (curr_ace->owner_type != GID_ACE)
2127                         continue;
2128
2129                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2130
2131                         if (allow_ace_p->attr != ALLOW_ACE)
2132                                 continue;
2133
2134                         /* Store a pointer to the Everyone allow, if it exists. */
2135                         if (allow_ace_p->owner_type == WORLD_ACE)
2136                                 allow_everyone_p = allow_ace_p;
2137
2138                         /* We process UID_ACE entries only. */
2139
2140                         if (allow_ace_p->owner_type != UID_ACE)
2141                                 continue;
2142
2143                         /* Mask off the deny group perms. */
2144
2145                         if (uid_entry_in_group( allow_ace_p, curr_ace))
2146                                 allow_ace_p->perms &= ~curr_ace->perms;
2147                 }
2148
2149                 /*
2150                  * Convert the deny to an allow with the correct perms and
2151                  * push to the end of the list.
2152                  */
2153
2154                 curr_ace->attr = ALLOW_ACE;
2155                 if (allow_everyone_p)
2156                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2157                 else
2158                         curr_ace->perms = (mode_t)0;
2159                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2160         }
2161
2162         /* Doing this fourth pass allows Windows semantics to be layered
2163          * on top of POSIX semantics. I'm not sure if this is desirable.
2164          * For example, in W2K ACLs there is no way to say, "Group X no
2165          * access, user Y full access" if user Y is a member of group X.
2166          * This seems completely broken semantics to me.... JRA.
2167          */
2168
2169 #if 0
2170         /* Pass 4 above - deal with allow entries. */
2171
2172         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2173                 canon_ace *allow_ace_p;
2174
2175                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2176
2177                 if (curr_ace->attr != ALLOW_ACE)
2178                         continue;
2179
2180                 if (curr_ace->owner_type != UID_ACE)
2181                         continue;
2182
2183                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2184
2185                         if (allow_ace_p->attr != ALLOW_ACE)
2186                                 continue;
2187
2188                         /* We process GID_ACE entries only. */
2189
2190                         if (allow_ace_p->owner_type != GID_ACE)
2191                                 continue;
2192
2193                         /* OR in the group perms. */
2194
2195                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2196                                 curr_ace->perms |= allow_ace_p->perms;
2197                 }
2198         }
2199 #endif
2200
2201         *pp_ace_list = ace_list;
2202 }
2203
2204 /****************************************************************************
2205  Create a default mode that will be used if a security descriptor entry has
2206  no user/group/world entries.
2207 ****************************************************************************/
2208
2209 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2210 {
2211         int snum = SNUM(fsp->conn);
2212         mode_t and_bits = (mode_t)0;
2213         mode_t or_bits = (mode_t)0;
2214         mode_t mode;
2215
2216         if (interitable_mode) {
2217                 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2218                                  fsp->fsp_name, NULL);
2219         } else {
2220                 mode = S_IRUSR;
2221         }
2222
2223         if (fsp->is_directory)
2224                 mode |= (S_IWUSR|S_IXUSR);
2225
2226         /*
2227          * Now AND with the create mode/directory mode bits then OR with the
2228          * force create mode/force directory mode bits.
2229          */
2230
2231         if (fsp->is_directory) {
2232                 and_bits = lp_dir_security_mask(snum);
2233                 or_bits = lp_force_dir_security_mode(snum);
2234         } else {
2235                 and_bits = lp_security_mask(snum);
2236                 or_bits = lp_force_security_mode(snum);
2237         }
2238
2239         return ((mode & and_bits)|or_bits);
2240 }
2241
2242 /****************************************************************************
2243  Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2244  succeeding.
2245 ****************************************************************************/
2246
2247 static bool unpack_canon_ace(files_struct *fsp,
2248                                 const SMB_STRUCT_STAT *pst,
2249                                 DOM_SID *pfile_owner_sid,
2250                                 DOM_SID *pfile_grp_sid,
2251                                 canon_ace **ppfile_ace,
2252                                 canon_ace **ppdir_ace,
2253                                 uint32 security_info_sent,
2254                                 const SEC_DESC *psd)
2255 {
2256         SMB_STRUCT_STAT st;
2257         canon_ace *file_ace = NULL;
2258         canon_ace *dir_ace = NULL;
2259
2260         *ppfile_ace = NULL;
2261         *ppdir_ace = NULL;
2262
2263         if(security_info_sent == 0) {
2264                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2265                 return False;
2266         }
2267
2268         /*
2269          * If no DACL then this is a chown only security descriptor.
2270          */
2271
2272         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2273                 return True;
2274
2275         /*
2276          * Now go through the DACL and create the canon_ace lists.
2277          */
2278
2279         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2280                                                                 &file_ace, &dir_ace, psd->dacl))
2281                 return False;
2282
2283         if ((file_ace == NULL) && (dir_ace == NULL)) {
2284                 /* W2K traverse DACL set - ignore. */
2285                 return True;
2286         }
2287
2288         /*
2289          * Go through the canon_ace list and merge entries
2290          * belonging to identical users of identical allow or deny type.
2291          * We can do this as all deny entries come first, followed by
2292          * all allow entries (we have mandated this before accepting this acl).
2293          */
2294
2295         print_canon_ace_list( "file ace - before merge", file_ace);
2296         merge_aces( &file_ace, false);
2297
2298         print_canon_ace_list( "dir ace - before merge", dir_ace);
2299         merge_aces( &dir_ace, true);
2300
2301         /*
2302          * NT ACLs are order dependent. Go through the acl lists and
2303          * process DENY entries by masking the allow entries.
2304          */
2305
2306         print_canon_ace_list( "file ace - before deny", file_ace);
2307         process_deny_list( &file_ace);
2308
2309         print_canon_ace_list( "dir ace - before deny", dir_ace);
2310         process_deny_list( &dir_ace);
2311
2312         /*
2313          * A well formed POSIX file or default ACL has at least 3 entries, a
2314          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2315          * and optionally a mask entry. Ensure this is the case.
2316          */
2317
2318         print_canon_ace_list( "file ace - before valid", file_ace);
2319
2320         st = *pst;
2321
2322         /*
2323          * A default 3 element mode entry for a file should be r-- --- ---.
2324          * A default 3 element mode entry for a directory should be rwx --- ---.
2325          */
2326
2327         st.st_ex_mode = create_default_mode(fsp, False);
2328
2329         if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params,
2330                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2331                 free_canon_ace_list(file_ace);
2332                 free_canon_ace_list(dir_ace);
2333                 return False;
2334         }
2335
2336         print_canon_ace_list( "dir ace - before valid", dir_ace);
2337
2338         /*
2339          * A default inheritable 3 element mode entry for a directory should be the
2340          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2341          * it's a directory.
2342          */
2343
2344         st.st_ex_mode = create_default_mode(fsp, True);
2345
2346         if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params,
2347                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2348                 free_canon_ace_list(file_ace);
2349                 free_canon_ace_list(dir_ace);
2350                 return False;
2351         }
2352
2353         print_canon_ace_list( "file ace - return", file_ace);
2354         print_canon_ace_list( "dir ace - return", dir_ace);
2355
2356         *ppfile_ace = file_ace;
2357         *ppdir_ace = dir_ace;
2358         return True;
2359
2360 }
2361
2362 /******************************************************************************
2363  When returning permissions, try and fit NT display
2364  semantics if possible. Note the the canon_entries here must have been malloced.
2365  The list format should be - first entry = owner, followed by group and other user
2366  entries, last entry = other.
2367
2368  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2369  are not ordered, and match on the most specific entry rather than walking a list,
2370  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2371
2372  Entry 0: owner : deny all except read and write.
2373  Entry 1: owner : allow read and write.
2374  Entry 2: group : deny all except read.
2375  Entry 3: group : allow read.
2376  Entry 4: Everyone : allow read.
2377
2378  But NT cannot display this in their ACL editor !
2379 ********************************************************************************/
2380
2381 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2382 {
2383         canon_ace *l_head = *pp_list_head;
2384         canon_ace *owner_ace = NULL;
2385         canon_ace *other_ace = NULL;
2386         canon_ace *ace = NULL;
2387
2388         for (ace = l_head; ace; ace = ace->next) {
2389                 if (ace->type == SMB_ACL_USER_OBJ)
2390                         owner_ace = ace;
2391                 else if (ace->type == SMB_ACL_OTHER) {
2392                         /* Last ace - this is "other" */
2393                         other_ace = ace;
2394                 }
2395         }
2396
2397         if (!owner_ace || !other_ace) {
2398                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2399                         filename ));
2400                 return;
2401         }
2402
2403         /*
2404          * The POSIX algorithm applies to owner first, and other last,
2405          * so ensure they are arranged in this order.
2406          */
2407
2408         if (owner_ace) {
2409                 DLIST_PROMOTE(l_head, owner_ace);
2410         }
2411
2412         if (other_ace) {
2413                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2414         }
2415
2416         /* We have probably changed the head of the list. */
2417
2418         *pp_list_head = l_head;
2419 }
2420
2421 /****************************************************************************
2422  Create a linked list of canonical ACE entries.
2423 ****************************************************************************/
2424
2425 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2426                                    const char *fname, SMB_ACL_T posix_acl,
2427                                    const SMB_STRUCT_STAT *psbuf,
2428                                    const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2429 {
2430         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2431         canon_ace *l_head = NULL;
2432         canon_ace *ace = NULL;
2433         canon_ace *next_ace = NULL;
2434         int entry_id = SMB_ACL_FIRST_ENTRY;
2435         SMB_ACL_ENTRY_T entry;
2436         size_t ace_count;
2437
2438         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2439                 SMB_ACL_TAG_T tagtype;
2440                 SMB_ACL_PERMSET_T permset;
2441                 DOM_SID sid;
2442                 posix_id unix_ug;
2443                 enum ace_owner owner_type;
2444
2445                 entry_id = SMB_ACL_NEXT_ENTRY;
2446
2447                 /* Is this a MASK entry ? */
2448                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2449                         continue;
2450
2451                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2452                         continue;
2453
2454                 /* Decide which SID to use based on the ACL type. */
2455                 switch(tagtype) {
2456                         case SMB_ACL_USER_OBJ:
2457                                 /* Get the SID from the owner. */
2458                                 sid_copy(&sid, powner);
2459                                 unix_ug.uid = psbuf->st_ex_uid;
2460                                 owner_type = UID_ACE;
2461                                 break;
2462                         case SMB_ACL_USER:
2463                                 {
2464                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2465                                         if (puid == NULL) {
2466                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2467                                                 continue;
2468                                         }
2469                                         uid_to_sid( &sid, *puid);
2470                                         unix_ug.uid = *puid;
2471                                         owner_type = UID_ACE;
2472                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2473                                         break;
2474                                 }
2475                         case SMB_ACL_GROUP_OBJ:
2476                                 /* Get the SID from the owning group. */
2477                                 sid_copy(&sid, pgroup);
2478                                 unix_ug.gid = psbuf->st_ex_gid;
2479                                 owner_type = GID_ACE;
2480                                 break;
2481                         case SMB_ACL_GROUP:
2482                                 {
2483                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2484                                         if (pgid == NULL) {
2485                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2486                                                 continue;
2487                                         }
2488                                         gid_to_sid( &sid, *pgid);
2489                                         unix_ug.gid = *pgid;
2490                                         owner_type = GID_ACE;
2491                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2492                                         break;
2493                                 }
2494                         case SMB_ACL_MASK:
2495                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2496                                 continue; /* Don't count the mask as an entry. */
2497                         case SMB_ACL_OTHER:
2498                                 /* Use the Everyone SID */
2499                                 sid = global_sid_World;
2500                                 unix_ug.world = -1;
2501                                 owner_type = WORLD_ACE;
2502                                 break;
2503                         default:
2504                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2505                                 continue;
2506                 }
2507
2508                 /*
2509                  * Add this entry to the list.
2510                  */
2511
2512                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2513                         goto fail;
2514
2515                 ZERO_STRUCTP(ace);
2516                 ace->type = tagtype;
2517                 ace->perms = convert_permset_to_mode_t(conn, permset);
2518                 ace->attr = ALLOW_ACE;
2519                 ace->trustee = sid;
2520                 ace->unix_ug = unix_ug;
2521                 ace->owner_type = owner_type;
2522                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2523
2524                 DLIST_ADD(l_head, ace);
2525         }
2526
2527         /*
2528          * This next call will ensure we have at least a user/group/world set.
2529          */
2530
2531         if (!ensure_canon_entry_valid(&l_head, conn->params,
2532                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2533                                       psbuf, False))
2534                 goto fail;
2535
2536         /*
2537          * Now go through the list, masking the permissions with the
2538          * acl_mask. Ensure all DENY Entries are at the start of the list.
2539          */
2540
2541         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2542
2543         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2544                 next_ace = ace->next;
2545
2546                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2547                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2548                         ace->perms &= acl_mask;
2549
2550                 if (ace->perms == 0) {
2551                         DLIST_PROMOTE(l_head, ace);
2552                 }
2553
2554                 if( DEBUGLVL( 10 ) ) {
2555                         print_canon_ace(ace, ace_count);
2556                 }
2557         }
2558
2559         arrange_posix_perms(fname,&l_head );
2560
2561         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2562
2563         return l_head;
2564
2565   fail:
2566
2567         free_canon_ace_list(l_head);
2568         return NULL;
2569 }
2570
2571 /****************************************************************************
2572  Check if the current user group list contains a given group.
2573 ****************************************************************************/
2574
2575 bool current_user_in_group(gid_t gid)
2576 {
2577         int i;
2578
2579         for (i = 0; i < current_user.ut.ngroups; i++) {
2580                 if (current_user.ut.groups[i] == gid) {
2581                         return True;
2582                 }
2583         }
2584
2585         return False;
2586 }
2587
2588 /****************************************************************************
2589  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2590 ****************************************************************************/
2591
2592 static bool acl_group_override(connection_struct *conn,
2593                                const struct smb_filename *smb_fname)
2594 {
2595         if ((errno != EPERM) && (errno != EACCES)) {
2596                 return false;
2597         }
2598
2599         /* file primary group == user primary or supplementary group */
2600         if (lp_acl_group_control(SNUM(conn)) &&
2601             current_user_in_group(smb_fname->st.st_ex_gid)) {
2602                 return true;
2603         }
2604
2605         /* user has writeable permission */
2606         if (lp_dos_filemode(SNUM(conn)) &&
2607             can_write_to_file(conn, smb_fname)) {
2608                 return true;
2609         }
2610
2611         return false;
2612 }
2613
2614 /****************************************************************************
2615  Attempt to apply an ACL to a file or directory.
2616 ****************************************************************************/
2617
2618 static bool set_canon_ace_list(files_struct *fsp,
2619                                 canon_ace *the_ace,
2620                                 bool default_ace,
2621                                 const SMB_STRUCT_STAT *psbuf,
2622                                 bool *pacl_set_support)
2623 {
2624         connection_struct *conn = fsp->conn;
2625         bool ret = False;
2626         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2627         canon_ace *p_ace;
2628         int i;
2629         SMB_ACL_ENTRY_T mask_entry;
2630         bool got_mask_entry = False;
2631         SMB_ACL_PERMSET_T mask_permset;
2632         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2633         bool needs_mask = False;
2634         mode_t mask_perms = 0;
2635
2636         /* Use the psbuf that was passed in. */
2637         if (psbuf != &fsp->fsp_name->st) {
2638                 fsp->fsp_name->st = *psbuf;
2639         }
2640
2641 #if defined(POSIX_ACL_NEEDS_MASK)
2642         /* HP-UX always wants to have a mask (called "class" there). */
2643         needs_mask = True;
2644 #endif
2645
2646         if (the_acl == NULL) {
2647
2648                 if (!no_acl_syscall_error(errno)) {
2649                         /*
2650                          * Only print this error message if we have some kind of ACL
2651                          * support that's not working. Otherwise we would always get this.
2652                          */
2653                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2654                                 default_ace ? "default" : "file", strerror(errno) ));
2655                 }
2656                 *pacl_set_support = False;
2657                 goto fail;
2658         }
2659
2660         if( DEBUGLVL( 10 )) {
2661                 dbgtext("set_canon_ace_list: setting ACL:\n");
2662                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2663                         print_canon_ace( p_ace, i);
2664                 }
2665         }
2666
2667         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2668                 SMB_ACL_ENTRY_T the_entry;
2669                 SMB_ACL_PERMSET_T the_permset;
2670
2671                 /*
2672                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2673                  * named group entries. But if there is an ACL_MASK entry, it applies
2674                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2675                  * so that it doesn't deny (i.e., mask off) any permissions.
2676                  */
2677
2678                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2679                         needs_mask = True;
2680                         mask_perms |= p_ace->perms;
2681                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2682                         mask_perms |= p_ace->perms;
2683                 }
2684
2685                 /*
2686                  * Get the entry for this ACE.
2687                  */
2688
2689                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2690                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2691                                 i, strerror(errno) ));
2692                         goto fail;
2693                 }
2694
2695                 if (p_ace->type == SMB_ACL_MASK) {
2696                         mask_entry = the_entry;
2697                         got_mask_entry = True;
2698                 }
2699
2700                 /*
2701                  * Ok - we now know the ACL calls should be working, don't
2702                  * allow fallback to chmod.
2703                  */
2704
2705                 *pacl_set_support = True;
2706
2707                 /*
2708                  * Initialise the entry from the canon_ace.
2709                  */
2710
2711                 /*
2712                  * First tell the entry what type of ACE this is.
2713                  */
2714
2715                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2716                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2717                                 i, strerror(errno) ));
2718                         goto fail;
2719                 }
2720
2721                 /*
2722                  * Only set the qualifier (user or group id) if the entry is a user
2723                  * or group id ACE.
2724                  */
2725
2726                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2727                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2728                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2729                                         i, strerror(errno) ));
2730                                 goto fail;
2731                         }
2732                 }
2733
2734                 /*
2735                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2736                  */
2737
2738                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2739                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2740                                 i, strerror(errno) ));
2741                         goto fail;
2742                 }
2743
2744                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2745                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2746                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2747                         goto fail;
2748                 }
2749
2750                 /*
2751                  * ..and apply them to the entry.
2752                  */
2753
2754                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2755                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2756                                 i, strerror(errno) ));
2757                         goto fail;
2758                 }
2759
2760                 if( DEBUGLVL( 10 ))
2761                         print_canon_ace( p_ace, i);
2762
2763         }
2764
2765         if (needs_mask && !got_mask_entry) {
2766                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2767                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2768                         goto fail;
2769                 }
2770
2771                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2772                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2773                         goto fail;
2774                 }
2775
2776                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2777                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2778                         goto fail;
2779                 }
2780
2781                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2782                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2783                         goto fail;
2784                 }
2785
2786                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2787                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2788                         goto fail;
2789                 }
2790         }
2791
2792         /*
2793          * Finally apply it to the file or directory.
2794          */
2795
2796         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2797                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2798                                              the_acl_type, the_acl) == -1) {
2799                         /*
2800                          * Some systems allow all the above calls and only fail with no ACL support
2801                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2802                          */
2803                         if (no_acl_syscall_error(errno)) {
2804                                 *pacl_set_support = False;
2805                         }
2806
2807                         if (acl_group_override(conn, fsp->fsp_name)) {
2808                                 int sret;
2809
2810                                 DEBUG(5,("set_canon_ace_list: acl group "
2811                                          "control on and current user in file "
2812                                          "%s primary group.\n",
2813                                          fsp_str_dbg(fsp)));
2814
2815                                 become_root();
2816                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2817                                     fsp->fsp_name->base_name, the_acl_type,
2818                                     the_acl);
2819                                 unbecome_root();
2820                                 if (sret == 0) {
2821                                         ret = True;
2822                                 }
2823                         }
2824
2825                         if (ret == False) {
2826                                 DEBUG(2,("set_canon_ace_list: "
2827                                          "sys_acl_set_file type %s failed for "
2828                                          "file %s (%s).\n",
2829                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2830                                          "directory default" : "file",
2831                                          fsp_str_dbg(fsp), strerror(errno)));
2832                                 goto fail;
2833                         }
2834                 }
2835         } else {
2836                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2837                         /*
2838                          * Some systems allow all the above calls and only fail with no ACL support
2839                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2840                          */
2841                         if (no_acl_syscall_error(errno)) {
2842                                 *pacl_set_support = False;
2843                         }
2844
2845                         if (acl_group_override(conn, fsp->fsp_name)) {
2846                                 int sret;
2847
2848                                 DEBUG(5,("set_canon_ace_list: acl group "
2849                                          "control on and current user in file "
2850                                          "%s primary group.\n",
2851                                          fsp_str_dbg(fsp)));
2852
2853                                 become_root();
2854                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2855                                 unbecome_root();
2856                                 if (sret == 0) {
2857                                         ret = True;
2858                                 }
2859                         }
2860
2861                         if (ret == False) {
2862                                 DEBUG(2,("set_canon_ace_list: "
2863                                          "sys_acl_set_file failed for file %s "
2864                                          "(%s).\n",
2865                                          fsp_str_dbg(fsp), strerror(errno)));
2866                                 goto fail;
2867                         }
2868                 }
2869         }
2870
2871         ret = True;
2872
2873   fail:
2874
2875         if (the_acl != NULL) {
2876                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2877         }
2878
2879         return ret;
2880 }
2881
2882 /****************************************************************************
2883  Find a particular canon_ace entry.
2884 ****************************************************************************/
2885
2886 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2887 {
2888         while (list) {
2889                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2890                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2891                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2892                         break;
2893                 list = list->next;
2894         }
2895         return list;
2896 }
2897
2898 /****************************************************************************
2899
2900 ****************************************************************************/
2901
2902 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2903 {
2904         SMB_ACL_ENTRY_T entry;
2905
2906         if (!the_acl)
2907                 return NULL;
2908         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2909                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2910                 return NULL;
2911         }
2912         return the_acl;
2913 }
2914
2915 /****************************************************************************
2916  Convert a canon_ace to a generic 3 element permission - if possible.
2917 ****************************************************************************/
2918
2919 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2920
2921 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2922 {
2923         int snum = SNUM(fsp->conn);
2924         size_t ace_count = count_canon_ace_list(file_ace_list);
2925         canon_ace *ace_p;
2926         canon_ace *owner_ace = NULL;
2927         canon_ace *group_ace = NULL;
2928         canon_ace *other_ace = NULL;
2929         mode_t and_bits;
2930         mode_t or_bits;
2931
2932         if (ace_count != 3) {
2933                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2934                          "entries for file %s to convert to posix perms.\n",
2935                          fsp_str_dbg(fsp)));
2936                 return False;
2937         }
2938
2939         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2940                 if (ace_p->owner_type == UID_ACE)
2941                         owner_ace = ace_p;
2942                 else if (ace_p->owner_type == GID_ACE)
2943                         group_ace = ace_p;
2944                 else if (ace_p->owner_type == WORLD_ACE)
2945                         other_ace = ace_p;
2946         }
2947
2948         if (!owner_ace || !group_ace || !other_ace) {
2949                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
2950                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
2951                 return False;
2952         }
2953
2954         *posix_perms = (mode_t)0;
2955
2956         *posix_perms |= owner_ace->perms;
2957         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2958         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2959         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2960         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2961         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2962         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2963
2964         /* The owner must have at least read access. */
2965
2966         *posix_perms |= S_IRUSR;
2967         if (fsp->is_directory)
2968                 *posix_perms |= (S_IWUSR|S_IXUSR);
2969
2970         /* If requested apply the masks. */
2971
2972         /* Get the initial bits to apply. */
2973
2974         if (fsp->is_directory) {
2975                 and_bits = lp_dir_security_mask(snum);
2976                 or_bits = lp_force_dir_security_mode(snum);
2977         } else {
2978                 and_bits = lp_security_mask(snum);
2979                 or_bits = lp_force_security_mode(snum);
2980         }
2981
2982         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2983
2984         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
2985                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
2986                   (int)group_ace->perms, (int)other_ace->perms,
2987                   (int)*posix_perms, fsp_str_dbg(fsp)));
2988
2989         return True;
2990 }
2991
2992 /****************************************************************************
2993   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2994   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2995   with CI|OI set so it is inherited and also applies to the directory.
2996   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2997 ****************************************************************************/
2998
2999 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
3000 {
3001         size_t i, j;
3002
3003         for (i = 0; i < num_aces; i++) {
3004                 for (j = i+1; j < num_aces; j++) {
3005                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3006                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3007                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3008                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3009
3010                         /* We know the lower number ACE's are file entries. */
3011                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3012                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3013                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3014                                 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3015                                 (i_inh == j_inh) &&
3016                                 (i_flags_ni == 0) &&
3017                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3018                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3019                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3020                                 /*
3021                                  * W2K wants to have access allowed zero access ACE's
3022                                  * at the end of the list. If the mask is zero, merge
3023                                  * the non-inherited ACE onto the inherited ACE.
3024                                  */
3025
3026                                 if (nt_ace_list[i].access_mask == 0) {
3027                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3028                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3029                                         if (num_aces - i - 1 > 0)
3030                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3031                                                                 sizeof(SEC_ACE));
3032
3033                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3034                                                 (unsigned int)i, (unsigned int)j ));
3035                                 } else {
3036                                         /*
3037                                          * These are identical except for the flags.
3038                                          * Merge the inherited ACE onto the non-inherited ACE.
3039                                          */
3040
3041                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3042                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3043                                         if (num_aces - j - 1 > 0)
3044                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3045                                                                 sizeof(SEC_ACE));
3046
3047                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3048                                                 (unsigned int)j, (unsigned int)i ));
3049                                 }
3050                                 num_aces--;
3051                                 break;
3052                         }
3053                 }
3054         }
3055
3056         return num_aces;
3057 }
3058
3059 /*
3060  * Add or Replace ACE entry.
3061  * In some cases we need to add a specific ACE for compatibility reasons.
3062  * When doing that we must make sure we are not actually creating a duplicate
3063  * entry. So we need to search whether an ACE entry already exist and eventually
3064  * replacce the access mask, or add a completely new entry if none was found.
3065  *
3066  * This function assumes the array has enough space to add a new entry without
3067  * any reallocation of memory.
3068  */
3069
3070 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3071                                 const DOM_SID *sid, enum security_ace_type type,
3072                                 uint32_t mask, uint8_t flags)
3073 {
3074         int i;
3075
3076         /* first search for a duplicate */
3077         for (i = 0; i < *num_aces; i++) {
3078                 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3079                     (nt_ace_list[i].flags == flags)) break;
3080         }
3081
3082         if (i < *num_aces) { /* found */
3083                 nt_ace_list[i].type = type;
3084                 nt_ace_list[i].access_mask = mask;
3085                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3086                            i, sid_string_dbg(sid), flags));
3087                 return;
3088         }
3089
3090         /* not found, append it */
3091         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3092 }
3093
3094
3095 /****************************************************************************
3096  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3097  the space for the return elements and returns the size needed to return the
3098  security descriptor. This should be the only external function needed for
3099  the UNIX style get ACL.
3100 ****************************************************************************/
3101
3102 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3103                                       const char *name,
3104                                       const SMB_STRUCT_STAT *sbuf,
3105                                       struct pai_val *pal,
3106                                       SMB_ACL_T posix_acl,
3107                                       SMB_ACL_T def_acl,
3108                                       uint32_t security_info,
3109                                       SEC_DESC **ppdesc)
3110 {
3111         DOM_SID owner_sid;
3112         DOM_SID group_sid;
3113         size_t sd_size = 0;
3114         SEC_ACL *psa = NULL;
3115         size_t num_acls = 0;
3116         size_t num_def_acls = 0;
3117         size_t num_aces = 0;
3118         canon_ace *file_ace = NULL;
3119         canon_ace *dir_ace = NULL;
3120         SEC_ACE *nt_ace_list = NULL;
3121         size_t num_profile_acls = 0;
3122         DOM_SID orig_owner_sid;
3123         SEC_DESC *psd = NULL;
3124         int i;
3125
3126         /*
3127          * Get the owner, group and world SIDs.
3128          */
3129
3130         create_file_sids(sbuf, &owner_sid, &group_sid);
3131
3132         if (lp_profile_acls(SNUM(conn))) {
3133                 /* For WXP SP1 the owner must be administrators. */
3134                 sid_copy(&orig_owner_sid, &owner_sid);
3135                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3136                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3137                 num_profile_acls = 3;
3138         }
3139
3140         if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3141
3142                 /*
3143                  * In the optimum case Creator Owner and Creator Group would be used for
3144                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3145                  * would lead to usability problems under Windows: The Creator entries
3146                  * are only available in browse lists of directories and not for files;
3147                  * additionally the identity of the owning group couldn't be determined.
3148                  * We therefore use those identities only for Default ACLs.
3149                  */
3150
3151                 /* Create the canon_ace lists. */
3152                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3153                                             &owner_sid, &group_sid, pal,
3154                                             SMB_ACL_TYPE_ACCESS);
3155
3156                 /* We must have *some* ACLS. */
3157
3158                 if (count_canon_ace_list(file_ace) == 0) {
3159                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3160                         goto done;
3161                 }
3162
3163                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3164                         dir_ace = canonicalise_acl(conn, name, def_acl,
3165                                                    sbuf,
3166                                                    &global_sid_Creator_Owner,
3167                                                    &global_sid_Creator_Group,
3168                                                    pal, SMB_ACL_TYPE_DEFAULT);
3169                 }
3170
3171                 /*
3172                  * Create the NT ACE list from the canonical ace lists.
3173                  */
3174
3175                 {
3176                         canon_ace *ace;
3177                         enum security_ace_type nt_acl_type;
3178
3179                         if (nt4_compatible_acls() && dir_ace) {
3180                                 /*
3181                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3182                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3183                                  * remove entries from the Access ACL if the
3184                                  * corresponding Default ACL entries have also been
3185                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3186                                  * are exceptions. We can do nothing
3187                                  * intelligent if the Default ACL contains entries that
3188                                  * are not also contained in the Access ACL, so this
3189                                  * case will still fail under NT 4.
3190                                  */
3191
3192                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3193                                 if (ace && !ace->perms) {
3194                                         DLIST_REMOVE(dir_ace, ace);
3195                                         SAFE_FREE(ace);
3196
3197                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3198                                         if (ace && !ace->perms) {
3199                                                 DLIST_REMOVE(file_ace, ace);
3200                                                 SAFE_FREE(ace);
3201                                         }
3202                                 }
3203
3204                                 /*
3205                                  * WinNT doesn't usually have Creator Group
3206                                  * in browse lists, so we send this entry to
3207                                  * WinNT even if it contains no relevant
3208                                  * permissions. Once we can add
3209                                  * Creator Group to browse lists we can
3210                                  * re-enable this.
3211                                  */
3212
3213 #if 0
3214                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3215                                 if (ace && !ace->perms) {
3216                                         DLIST_REMOVE(dir_ace, ace);
3217                                         SAFE_FREE(ace);
3218                                 }
3219 #endif
3220
3221                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3222                                 if (ace && !ace->perms) {
3223                                         DLIST_REMOVE(file_ace, ace);
3224                                         SAFE_FREE(ace);
3225                                 }
3226                         }
3227
3228                         num_acls = count_canon_ace_list(file_ace);
3229                         num_def_acls = count_canon_ace_list(dir_ace);
3230
3231                         /* Allocate the ace list. */
3232                         if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3233                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3234                                 goto done;
3235                         }
3236
3237                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3238
3239                         /*
3240                          * Create the NT ACE list from the canonical ace lists.
3241                          */
3242
3243                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3244                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3245                                                 &nt_acl_type,
3246                                                 ace->perms,
3247                                                 S_ISDIR(sbuf->st_ex_mode));
3248                                 init_sec_ace(&nt_ace_list[num_aces++],
3249                                         &ace->trustee,
3250                                         nt_acl_type,
3251                                         acc,
3252                                         ace->ace_flags);
3253                         }
3254
3255                         /* The User must have access to a profile share - even
3256                          * if we can't map the SID. */
3257                         if (lp_profile_acls(SNUM(conn))) {
3258                                 add_or_replace_ace(nt_ace_list, &num_aces,
3259                                                    &global_sid_Builtin_Users,
3260                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3261                                                    FILE_GENERIC_ALL, 0);
3262                         }
3263
3264                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3265                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3266                                                 &nt_acl_type,
3267                                                 ace->perms,
3268                                                 S_ISDIR(sbuf->st_ex_mode));
3269                                 init_sec_ace(&nt_ace_list[num_aces++],
3270                                         &ace->trustee,
3271                                         nt_acl_type,
3272                                         acc,
3273                                         ace->ace_flags |
3274                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3275                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3276                                         SEC_ACE_FLAG_INHERIT_ONLY);
3277                         }
3278
3279                         /* The User must have access to a profile share - even
3280                          * if we can't map the SID. */
3281                         if (lp_profile_acls(SNUM(conn))) {
3282                                 add_or_replace_ace(nt_ace_list, &num_aces,
3283                                                 &global_sid_Builtin_Users,
3284                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3285                                                 FILE_GENERIC_ALL,
3286                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3287                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3288                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3289                         }
3290
3291                         /*
3292                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3293                          * Win2K needs this to get the inheritance correct when replacing ACLs
3294                          * on a directory tree. Based on work by Jim @ IBM.
3295                          */
3296
3297                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3298
3299                         if (lp_profile_acls(SNUM(conn))) {
3300                                 for (i = 0; i < num_aces; i++) {
3301                                         if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3302                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3303                                                                    &orig_owner_sid,
3304                                                                    nt_ace_list[i].type,
3305                                                                    nt_ace_list[i].access_mask,
3306                                                                    nt_ace_list[i].flags);
3307                                                 break;
3308                                         }
3309                                 }
3310                         }
3311                 }
3312
3313                 if (num_aces) {
3314                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3315                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3316                                 goto done;
3317                         }
3318                 }
3319         } /* security_info & DACL_SECURITY_INFORMATION */
3320
3321         psd = make_standard_sec_desc( talloc_tos(),
3322                         (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3323                         (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3324                         psa,
3325                         &sd_size);
3326
3327         if(!psd) {
3328                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3329                 sd_size = 0;
3330                 goto done;
3331         }
3332
3333         /*
3334          * Windows 2000: The DACL_PROTECTED flag in the security
3335          * descriptor marks the ACL as non-inheriting, i.e., no
3336          * ACEs from higher level directories propagate to this
3337          * ACL. In the POSIX ACL model permissions are only
3338          * inherited at file create time, so ACLs never contain
3339          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3340          * flag doesn't seem to bother Windows NT.
3341          * Always set this if map acl inherit is turned off.
3342          */
3343         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3344                 psd->type |= SEC_DESC_DACL_PROTECTED;
3345         } else {
3346                 psd->type |= pal->sd_type;
3347         }
3348
3349         if (psd->dacl) {
3350                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3351         }
3352
3353         *ppdesc = psd;
3354
3355  done:
3356
3357         if (posix_acl) {
3358                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3359         }
3360         if (def_acl) {
3361                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3362         }
3363         free_canon_ace_list(file_ace);
3364         free_canon_ace_list(dir_ace);
3365         free_inherited_info(pal);
3366         SAFE_FREE(nt_ace_list);
3367
3368         return NT_STATUS_OK;
3369 }
3370
3371 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3372                            SEC_DESC **ppdesc)
3373 {
3374         SMB_STRUCT_STAT sbuf;
3375         SMB_ACL_T posix_acl = NULL;
3376         struct pai_val *pal;
3377
3378         *ppdesc = NULL;
3379
3380         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3381                   fsp_str_dbg(fsp)));
3382
3383         /* can it happen that fsp_name == NULL ? */
3384         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3385                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3386                                         security_info, ppdesc);
3387         }
3388
3389         /* Get the stat struct for the owner info. */
3390         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3391                 return map_nt_error_from_unix(errno);
3392         }
3393
3394         /* Get the ACL from the fd. */
3395         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3396
3397         pal = fload_inherited_info(fsp);
3398
3399         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3400                                        &sbuf, pal, posix_acl, NULL,
3401                                        security_info, ppdesc);
3402 }
3403
3404 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3405                           uint32_t security_info, SEC_DESC **ppdesc)
3406 {
3407         SMB_ACL_T posix_acl = NULL;
3408         SMB_ACL_T def_acl = NULL;
3409         struct pai_val *pal;
3410         struct smb_filename smb_fname;
3411         int ret;
3412
3413         *ppdesc = NULL;
3414
3415         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3416
3417         ZERO_STRUCT(smb_fname);
3418         smb_fname.base_name = discard_const_p(char, name);
3419
3420         /* Get the stat struct for the owner info. */
3421         if (lp_posix_pathnames()) {
3422                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3423         } else {
3424                 ret = SMB_VFS_STAT(conn, &smb_fname);
3425         }
3426
3427         if (ret == -1) {
3428                 return map_nt_error_from_unix(errno);
3429         }
3430
3431         /* Get the ACL from the path. */
3432         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3433
3434         /* If it's a directory get the default POSIX ACL. */
3435         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3436                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3437                 def_acl = free_empty_sys_acl(conn, def_acl);
3438         }
3439
3440         pal = load_inherited_info(conn, name);
3441
3442         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3443                                        posix_acl, def_acl, security_info,
3444                                        ppdesc);
3445 }
3446
3447 /****************************************************************************
3448  Try to chown a file. We will be able to chown it under the following conditions.
3449
3450   1) If we have root privileges, then it will just work.
3451   2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3452   3) If we have SeRestorePrivilege we can change the user to any other user.
3453   4) If we have write permission to the file and dos_filemodes is set
3454      then allow chown to the currently authenticated user.
3455 ****************************************************************************/
3456
3457 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3458               uid_t uid, gid_t gid)
3459 {
3460         int ret;
3461         files_struct *fsp;
3462
3463         if(!CAN_WRITE(conn)) {
3464                 return -1;
3465         }
3466
3467         /* Case (1). */
3468         /* try the direct way first */
3469         if (lp_posix_pathnames()) {
3470                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3471         } else {
3472                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3473         }
3474
3475         if (ret == 0)
3476                 return 0;
3477
3478         /* Case (2) / (3) */
3479         if (lp_enable_privileges()) {
3480
3481                 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3482                                                               &se_take_ownership);
3483                 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3484                                                        &se_restore);
3485
3486                 /* Case (2) */
3487                 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3488                 /* Case (3) */
3489                      ( has_restore_priv ) ) {
3490
3491                         become_root();
3492                         /* Keep the current file gid the same - take ownership doesn't imply group change. */
3493                         if (lp_posix_pathnames()) {
3494                                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3495                                                     (gid_t)-1);
3496                         } else {
3497                                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3498                                                     (gid_t)-1);
3499                         }
3500                         unbecome_root();
3501                         return ret;
3502                 }
3503         }
3504
3505         /* Case (4). */
3506         if (!lp_dos_filemode(SNUM(conn))) {
3507                 errno = EPERM;
3508                 return -1;
3509         }
3510
3511         /* only allow chown to the current user. This is more secure,
3512            and also copes with the case where the SID in a take ownership ACL is
3513            a local SID on the users workstation
3514         */
3515         if (uid != current_user.ut.uid) {
3516                 errno = EPERM;
3517                 return -1;
3518         }
3519
3520         if (lp_posix_pathnames()) {
3521                 ret = SMB_VFS_LSTAT(conn, smb_fname);
3522         } else {
3523                 ret = SMB_VFS_STAT(conn, smb_fname);
3524         }
3525
3526         if (ret == -1) {
3527                 return -1;
3528         }
3529
3530         if (!NT_STATUS_IS_OK(open_file_fchmod(conn, smb_fname, &fsp))) {
3531                 return -1;
3532         }
3533
3534         become_root();
3535         /* Keep the current file gid the same. */
3536         if (fsp->fh->fd == -1) {
3537                 if (lp_posix_pathnames()) {
3538                         ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3539                                             (gid_t)-1);
3540                 } else {
3541                         ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3542                                             (gid_t)-1);
3543                 }
3544         } else {
3545                 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3546         }
3547         unbecome_root();
3548
3549         close_file(NULL, fsp, NORMAL_CLOSE);
3550
3551         return ret;
3552 }
3553
3554 #if 0
3555 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3556
3557 /****************************************************************************
3558  Take care of parent ACL inheritance.
3559 ****************************************************************************/
3560
3561 NTSTATUS append_parent_acl(files_struct *fsp,
3562                                 const SEC_DESC *pcsd,
3563                                 SEC_DESC **pp_new_sd)
3564 {
3565         struct smb_filename *smb_dname = NULL;
3566         SEC_DESC *parent_sd = NULL;
3567         files_struct *parent_fsp = NULL;
3568         TALLOC_CTX *mem_ctx = talloc_tos();
3569         char *parent_name = NULL;
3570         SEC_ACE *new_ace = NULL;
3571         unsigned int num_aces = pcsd->dacl->num_aces;
3572         NTSTATUS status;
3573         int info;
3574         unsigned int i, j;
3575         SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3576         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3577
3578         if (psd == NULL) {
3579                 return NT_STATUS_NO_MEMORY;
3580         }
3581
3582         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3583                             NULL)) {
3584                 return NT_STATUS_NO_MEMORY;
3585         }
3586
3587         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3588                                             &smb_dname);
3589         if (!NT_STATUS_IS_OK(status)) {
3590                 goto fail;
3591         }
3592
3593         status = SMB_VFS_CREATE_FILE(
3594                 fsp->conn,                              /* conn */
3595                 NULL,                                   /* req */
3596                 0,                                      /* root_dir_fid */
3597                 smb_dname,                              /* fname */
3598                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3599                 FILE_SHARE_NONE,                        /* share_access */
3600                 FILE_OPEN,                              /* create_disposition*/
3601                 FILE_DIRECTORY_FILE,                    /* create_options */
3602                 0,                                      /* file_attributes */
3603                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3604                 0,                                      /* allocation_size */
3605                 NULL,                                   /* sd */
3606                 NULL,                                   /* ea_list */
3607                 &parent_fsp,                            /* result */
3608                 &info);                                 /* pinfo */
3609
3610         if (!NT_STATUS_IS_OK(status)) {
3611                 TALLOC_FREE(smb_dname);
3612                 return status;
3613         }
3614
3615         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3616                                     DACL_SECURITY_INFORMATION, &parent_sd );
3617
3618         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3619         TALLOC_FREE(smb_dname);
3620
3621         if (!NT_STATUS_IS_OK(status)) {
3622                 return status;
3623         }
3624
3625         /*
3626          * Make room for potentially all the ACLs from
3627          * the parent. We used to add the ugw triple here,
3628          * as we knew we were dealing with POSIX ACLs.
3629          * We no longer need to do so as we can guarentee
3630          * that a default ACL from the parent directory will
3631          * be well formed for POSIX ACLs if it came from a
3632          * POSIX ACL source, and if we're not writing to a
3633          * POSIX ACL sink then we don't care if it's not well
3634          * formed. JRA.
3635          */
3636
3637         num_aces += parent_sd->dacl->num_aces;
3638
3639         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3640                                         num_aces)) == NULL) {
3641                 return NT_STATUS_NO_MEMORY;
3642         }
3643
3644         /* Start by copying in all the given ACE entries. */
3645         for (i = 0; i < psd->dacl->num_aces; i++) {
3646                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3647         }
3648
3649         /*
3650          * Note that we're ignoring "inherit permissions" here
3651          * as that really only applies to newly created files. JRA.
3652          */
3653
3654         /* Finally append any inherited ACEs. */
3655         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3656                 SEC_ACE *se = &parent_sd->dacl->aces[j];
3657
3658                 if (fsp->is_directory) {
3659                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3660                                 /* Doesn't apply to a directory - ignore. */
3661                                 DEBUG(10,("append_parent_acl: directory %s "
3662                                         "ignoring non container "
3663                                         "inherit flags %u on ACE with sid %s "
3664                                         "from parent %s\n",
3665                                         fsp_str_dbg(fsp),
3666                                         (unsigned int)se->flags,
3667                                         sid_string_dbg(&se->trustee),
3668                                         parent_name));
3669                                 continue;
3670                         }
3671                 } else {
3672                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3673                                 /* Doesn't apply to a file - ignore. */
3674                                 DEBUG(10,("append_parent_acl: file %s "
3675                                         "ignoring non object "
3676                                         "inherit flags %u on ACE with sid %s "
3677                                         "from parent %s\n",
3678                                         fsp_str_dbg(fsp),
3679                                         (unsigned int)se->flags,
3680                                         sid_string_dbg(&se->trustee),
3681                                         parent_name));
3682                                 continue;
3683                         }
3684                 }
3685
3686                 if (is_dacl_protected) {
3687                         /* If the DACL is protected it means we must
3688                          * not overwrite an existing ACE entry with the
3689                          * same SID. This is order N^2. Ouch :-(. JRA. */
3690                         unsigned int k;
3691                         for (k = 0; k < psd->dacl->num_aces; k++) {
3692                                 if (sid_equal(&psd->dacl->aces[k].trustee,
3693                                                 &se->trustee)) {
3694                                         break;
3695                                 }
3696                         }
3697                         if (k < psd->dacl->num_aces) {
3698                                 /* SID matched. Ignore. */
3699                                 DEBUG(10,("append_parent_acl: path %s "
3700                                         "ignoring ACE with protected sid %s "
3701                                         "from parent %s\n",
3702                                         fsp_str_dbg(fsp),
3703                                         sid_string_dbg(&se->trustee),
3704                                         parent_name));
3705                                 continue;
3706                         }
3707                 }
3708
3709                 sec_ace_copy(&new_ace[i], se);
3710                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3711                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3712                 }
3713                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3714
3715                 if (fsp->is_directory) {
3716                         /*
3717                          * Strip off any inherit only. It's applied.
3718                          */
3719                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3720                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3721                                 /* No further inheritance. */
3722                                 new_ace[i].flags &=
3723                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3724                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3725                         }
3726                 } else {
3727                         /*
3728                          * Strip off any container or inherit
3729                          * flags, they can't apply to objects.
3730                          */
3731                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3732                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3733                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3734                 }
3735                 i++;
3736
3737                 DEBUG(10,("append_parent_acl: path %s "
3738                         "inheriting ACE with sid %s "
3739                         "from parent %s\n",
3740                         fsp_str_dbg(fsp),
3741                         sid_string_dbg(&se->trustee),
3742                         parent_name));
3743         }
3744
3745         psd->dacl->aces = new_ace;
3746         psd->dacl->num_aces = i;
3747         psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3748                          SE_DESC_DACL_AUTO_INHERIT_REQ);
3749
3750         *pp_new_sd = psd;
3751         return status;
3752 }
3753 #endif
3754
3755 /****************************************************************************
3756  Reply to set a security descriptor on an fsp. security_info_sent is the
3757  description of the following NT ACL.
3758  This should be the only external function needed for the UNIX style set ACL.
3759 ****************************************************************************/
3760
3761 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd_orig)
3762 {
3763         connection_struct *conn = fsp->conn;
3764         uid_t user = (uid_t)-1;
3765         gid_t grp = (gid_t)-1;
3766         DOM_SID file_owner_sid;
3767         DOM_SID file_grp_sid;
3768         canon_ace *file_ace_list = NULL;
3769         canon_ace *dir_ace_list = NULL;
3770         bool acl_perms = False;
3771         mode_t orig_mode = (mode_t)0;
3772         NTSTATUS status;
3773         bool set_acl_as_root = false;
3774         bool acl_set_support = false;
3775         bool ret = false;
3776         SEC_DESC *psd = NULL;
3777
3778         DEBUG(10,("set_nt_acl: called for file %s\n",
3779                   fsp_str_dbg(fsp)));
3780
3781         if (!CAN_WRITE(conn)) {
3782                 DEBUG(10,("set acl rejected on read-only share\n"));
3783                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3784         }
3785
3786         if (!psd_orig) {
3787                 return NT_STATUS_INVALID_PARAMETER;
3788         }
3789
3790         psd = dup_sec_desc(talloc_tos(), psd_orig);
3791         if (!psd) {
3792                 return NT_STATUS_NO_MEMORY;
3793         }
3794
3795         /*
3796          * Get the current state of the file.
3797          */
3798
3799         status = vfs_stat_fsp(fsp);
3800         if (!NT_STATUS_IS_OK(status)) {
3801                 return status;
3802         }
3803
3804         /* Save the original element we check against. */
3805         orig_mode = fsp->fsp_name->st.st_ex_mode;
3806
3807         /*
3808          * Unpack the user/group/world id's.
3809          */
3810
3811         /* POSIX can't cope with missing owner/group. */
3812         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3813                 security_info_sent &= ~SECINFO_OWNER;
3814         }
3815         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3816                 security_info_sent &= ~SECINFO_GROUP;
3817         }
3818
3819         status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3820         if (!NT_STATUS_IS_OK(status)) {
3821                 return status;
3822         }
3823
3824         /*
3825          * Do we need to chown ? If so this must be done first as the incoming
3826          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3827          * Noticed by Simo.
3828          */
3829
3830         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3831             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3832
3833                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3834                          fsp_str_dbg(fsp), (unsigned int)user,
3835                          (unsigned int)grp));
3836
3837                 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3838                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3839                                  "= %s.\n", fsp_str_dbg(fsp),
3840                                  (unsigned int)user, (unsigned int)grp,
3841                                  strerror(errno)));
3842                         if (errno == EPERM) {
3843                                 return NT_STATUS_INVALID_OWNER;
3844                         }
3845                         return map_nt_error_from_unix(errno);
3846                 }
3847
3848                 /*
3849                  * Recheck the current state of the file, which may have changed.
3850                  * (suid/sgid bits, for instance)
3851                  */
3852
3853                 status = vfs_stat_fsp(fsp);
3854                 if (!NT_STATUS_IS_OK(status)) {
3855                         return status;
3856                 }
3857
3858                 /* Save the original element we check against. */
3859                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3860
3861                 /* If we successfully chowned, we know we must
3862                  * be able to set the acl, so do it as root.
3863                  */
3864                 set_acl_as_root = true;
3865         }
3866
3867         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3868
3869         if((security_info_sent & SECINFO_DACL) &&
3870                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3871                         (psd->dacl == NULL)) {
3872                 SEC_ACE ace[3];
3873
3874                 /* We can't have NULL DACL in POSIX.
3875                    Use owner/group/Everyone -> full access. */
3876
3877                 init_sec_ace(&ace[0],
3878                                 &file_owner_sid,
3879                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3880                                 GENERIC_ALL_ACCESS,
3881                                 0);
3882                 init_sec_ace(&ace[1],
3883                                 &file_grp_sid,
3884                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3885                                 GENERIC_ALL_ACCESS,
3886                                 0);
3887                 init_sec_ace(&ace[2],
3888                                 &global_sid_World,
3889                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3890                                 GENERIC_ALL_ACCESS,
3891                                 0);
3892                 psd->dacl = make_sec_acl(talloc_tos(),
3893                                         NT4_ACL_REVISION,
3894                                         3,
3895                                         ace);
3896                 if (psd->dacl == NULL) {
3897                         return NT_STATUS_NO_MEMORY;
3898                 }
3899                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3900         }
3901
3902         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3903                                      &file_grp_sid, &file_ace_list,
3904                                      &dir_ace_list, security_info_sent, psd);
3905
3906         /* Ignore W2K traverse DACL set. */
3907         if (!file_ace_list && !dir_ace_list) {
3908                 return NT_STATUS_OK;
3909         }
3910
3911         if (!acl_perms) {
3912                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3913                 free_canon_ace_list(file_ace_list);
3914                 free_canon_ace_list(dir_ace_list);
3915                 return NT_STATUS_ACCESS_DENIED;
3916         }
3917
3918         /*
3919          * Only change security if we got a DACL.
3920          */
3921
3922         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3923                 free_canon_ace_list(file_ace_list);
3924                 free_canon_ace_list(dir_ace_list);
3925                 return NT_STATUS_OK;
3926         }
3927
3928         /*
3929          * Try using the POSIX ACL set first. Fall back to chmod if
3930          * we have no ACL support on this filesystem.
3931          */
3932
3933         if (acl_perms && file_ace_list) {
3934                 if (set_acl_as_root) {
3935                         become_root();
3936                 }
3937                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3938                                          &fsp->fsp_name->st, &acl_set_support);
3939                 if (set_acl_as_root) {
3940                         unbecome_root();
3941                 }
3942                 if (acl_set_support && ret == false) {
3943                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3944                                  "%s (%s).\n", fsp_str_dbg(fsp),
3945                                  strerror(errno)));
3946                         free_canon_ace_list(file_ace_list);
3947                         free_canon_ace_list(dir_ace_list);
3948                         return map_nt_error_from_unix(errno);
3949                 }
3950         }
3951
3952         if (acl_perms && acl_set_support && fsp->is_directory) {
3953                 if (dir_ace_list) {
3954                         if (set_acl_as_root) {
3955                                 become_root();
3956                         }
3957                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
3958                                                  &fsp->fsp_name->st,
3959                                                  &acl_set_support);
3960                         if (set_acl_as_root) {
3961                                 unbecome_root();
3962                         }
3963                         if (ret == false) {
3964                                 DEBUG(3,("set_nt_acl: failed to set default "
3965                                          "acl on directory %s (%s).\n",
3966                                          fsp_str_dbg(fsp), strerror(errno)));
3967                                 free_canon_ace_list(file_ace_list);
3968                                 free_canon_ace_list(dir_ace_list);
3969                                 return map_nt_error_from_unix(errno);
3970                         }
3971                 } else {
3972                         int sret = -1;
3973
3974                         /*
3975                          * No default ACL - delete one if it exists.
3976                          */
3977
3978                         if (set_acl_as_root) {
3979                                 become_root();
3980                         }
3981                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3982                             fsp->fsp_name->base_name);
3983                         if (set_acl_as_root) {
3984                                 unbecome_root();
3985                         }
3986                         if (sret == -1) {
3987                                 if (acl_group_override(conn, fsp->fsp_name)) {
3988                                         DEBUG(5,("set_nt_acl: acl group "
3989                                                  "control on and current user "
3990                                                  "in file %s primary group. "
3991                                                  "Override delete_def_acl\n",
3992                                                  fsp_str_dbg(fsp)));
3993
3994                                         become_root();
3995                                         sret =
3996                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3997                                                     conn,
3998                                                     fsp->fsp_name->base_name);
3999                                         unbecome_root();
4000                                 }
4001
4002                                 if (sret == -1) {
4003                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4004                                         free_canon_ace_list(file_ace_list);
4005                                         free_canon_ace_list(dir_ace_list);
4006                                         return map_nt_error_from_unix(errno);
4007                                 }
4008                         }
4009                 }
4010         }
4011
4012         if (acl_set_support) {
4013                 if (set_acl_as_root) {
4014                         become_root();
4015                 }
4016                 store_inheritance_attributes(fsp,
4017                                 file_ace_list,
4018                                 dir_ace_list,
4019                                 psd->type);
4020                 if (set_acl_as_root) {
4021                         unbecome_root();
4022                 }
4023         }
4024
4025         /*
4026          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4027          */
4028
4029         if(!acl_set_support && acl_perms) {
4030                 mode_t posix_perms;
4031
4032                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4033                         free_canon_ace_list(file_ace_list);
4034                         free_canon_ace_list(dir_ace_list);
4035                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4036                                  "posix permissions for file %s.\n",
4037                                  fsp_str_dbg(fsp)));
4038                         return NT_STATUS_ACCESS_DENIED;
4039                 }
4040
4041                 if (orig_mode != posix_perms) {
4042                         int sret = -1;
4043
4044                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4045                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4046
4047                         if (set_acl_as_root) {
4048                                 become_root();
4049                         }
4050                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4051                                              posix_perms);
4052                         if (set_acl_as_root) {
4053                                 unbecome_root();
4054                         }
4055                         if(sret == -1) {
4056                                 if (acl_group_override(conn, fsp->fsp_name)) {
4057                                         DEBUG(5,("set_nt_acl: acl group "
4058                                                  "control on and current user "
4059                                                  "in file %s primary group. "
4060                                                  "Override chmod\n",
4061                                                  fsp_str_dbg(fsp)));
4062
4063                                         become_root();
4064                                         sret = SMB_VFS_CHMOD(conn,
4065                                             fsp->fsp_name->base_name,
4066                                             posix_perms);
4067                                         unbecome_root();
4068                                 }
4069
4070                                 if (sret == -1) {
4071                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4072                                                  "failed. Error = %s.\n",
4073                                                  fsp_str_dbg(fsp),
4074                                                  (unsigned int)posix_perms,
4075                                                  strerror(errno)));
4076                                         free_canon_ace_list(file_ace_list);
4077                                         free_canon_ace_list(dir_ace_list);
4078                                         return map_nt_error_from_unix(errno);
4079                                 }
4080                         }
4081                 }
4082         }
4083
4084         free_canon_ace_list(file_ace_list);
4085         free_canon_ace_list(dir_ace_list);
4086
4087         /* Ensure the stat struct in the fsp is correct. */
4088         status = vfs_stat_fsp(fsp);
4089
4090         return NT_STATUS_OK;
4091 }
4092
4093 /****************************************************************************
4094  Get the actual group bits stored on a file with an ACL. Has no effect if
4095  the file has no ACL. Needed in dosmode code where the stat() will return
4096  the mask bits, not the real group bits, for a file with an ACL.
4097 ****************************************************************************/
4098
4099 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4100 {
4101         int entry_id = SMB_ACL_FIRST_ENTRY;
4102         SMB_ACL_ENTRY_T entry;
4103         SMB_ACL_T posix_acl;
4104         int result = -1;
4105
4106         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4107         if (posix_acl == (SMB_ACL_T)NULL)
4108                 return -1;
4109
4110         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4111                 SMB_ACL_TAG_T tagtype;
4112                 SMB_ACL_PERMSET_T permset;
4113
4114                 entry_id = SMB_ACL_NEXT_ENTRY;
4115
4116                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4117                         break;
4118
4119                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4120                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4121                                 break;
4122                         } else {
4123                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4124                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4125                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4126                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4127                                 result = 0;
4128                                 break;
4129                         }
4130                 }
4131         }
4132         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4133         return result;
4134 }
4135
4136 /****************************************************************************
4137  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4138  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4139 ****************************************************************************/
4140
4141 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4142 {
4143         int entry_id = SMB_ACL_FIRST_ENTRY;
4144         SMB_ACL_ENTRY_T entry;
4145         int num_entries = 0;
4146
4147         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4148                 SMB_ACL_TAG_T tagtype;
4149                 SMB_ACL_PERMSET_T permset;
4150                 mode_t perms;
4151
4152                 entry_id = SMB_ACL_NEXT_ENTRY;
4153
4154                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4155                         return -1;
4156
4157                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4158                         return -1;
4159
4160                 num_entries++;
4161
4162                 switch(tagtype) {
4163                         case SMB_ACL_USER_OBJ:
4164                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4165                                 break;
4166                         case SMB_ACL_GROUP_OBJ:
4167                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4168                                 break;
4169                         case SMB_ACL_MASK:
4170                                 /*
4171                                  * FIXME: The ACL_MASK entry permissions should really be set to
4172                                  * the union of the permissions of all ACL_USER,
4173                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4174                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4175                                  */
4176                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4177                                 break;
4178                         case SMB_ACL_OTHER:
4179                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4180                                 break;
4181                         default:
4182                                 continue;
4183                 }
4184
4185                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4186                         return -1;
4187
4188                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4189                         return -1;
4190         }
4191
4192         /*
4193          * If this is a simple 3 element ACL or no elements then it's a standard
4194          * UNIX permission set. Just use chmod...
4195          */
4196
4197         if ((num_entries == 3) || (num_entries == 0))
4198                 return -1;
4199
4200         return 0;
4201 }
4202
4203 /****************************************************************************
4204  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4205  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4206  resulting ACL on TO.  Note that name is in UNIX character set.
4207 ****************************************************************************/
4208
4209 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4210 {
4211         SMB_ACL_T posix_acl = NULL;
4212         int ret = -1;
4213
4214         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4215                 return -1;
4216
4217         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4218                 goto done;
4219
4220         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4221
4222  done:
4223
4224         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4225         return ret;
4226 }
4227
4228 /****************************************************************************
4229  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4230  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4231  Note that name is in UNIX character set.
4232 ****************************************************************************/
4233
4234 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4235 {
4236         return copy_access_posix_acl(conn, name, name, mode);
4237 }
4238
4239 /****************************************************************************
4240  Check for an existing default POSIX ACL on a directory.
4241 ****************************************************************************/
4242
4243 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4244 {
4245         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4246         bool has_acl = False;
4247         SMB_ACL_ENTRY_T entry;
4248
4249         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4250                 has_acl = True;
4251         }
4252
4253         if (def_acl) {
4254                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4255         }
4256         return has_acl;
4257 }
4258
4259 /****************************************************************************
4260  If the parent directory has no default ACL but it does have an Access ACL,
4261  inherit this Access ACL to file name.
4262 ****************************************************************************/
4263
4264 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4265                        const char *name, mode_t mode)
4266 {
4267         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4268                 return 0;
4269
4270         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4271 }
4272
4273 /****************************************************************************
4274  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4275  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4276 ****************************************************************************/
4277
4278 int fchmod_acl(files_struct *fsp, mode_t mode)
4279 {
4280         connection_struct *conn = fsp->conn;
4281         SMB_ACL_T posix_acl = NULL;
4282         int ret = -1;
4283
4284         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4285                 return -1;
4286
4287         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4288                 goto done;
4289
4290         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4291
4292   done:
4293
4294         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4295         return ret;
4296 }
4297
4298 /****************************************************************************
4299  Map from wire type to permset.
4300 ****************************************************************************/
4301
4302 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4303 {
4304         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4305                 return False;
4306         }
4307
4308         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4309                 return False;
4310         }
4311
4312         if (wire_perm & SMB_POSIX_ACL_READ) {
4313                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4314                         return False;
4315                 }
4316         }
4317         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4318                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4319                         return False;
4320                 }
4321         }
4322         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4323                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4324                         return False;
4325                 }
4326         }
4327         return True;
4328 }
4329
4330 /****************************************************************************
4331  Map from wire type to tagtype.
4332 ****************************************************************************/
4333
4334 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4335 {
4336         switch (wire_tt) {
4337                 case SMB_POSIX_ACL_USER_OBJ:
4338                         *p_tt = SMB_ACL_USER_OBJ;
4339                         break;
4340                 case SMB_POSIX_ACL_USER:
4341                         *p_tt = SMB_ACL_USER;
4342                         break;
4343                 case SMB_POSIX_ACL_GROUP_OBJ:
4344                         *p_tt = SMB_ACL_GROUP_OBJ;
4345                         break;
4346                 case SMB_POSIX_ACL_GROUP:
4347                         *p_tt = SMB_ACL_GROUP;
4348                         break;
4349                 case SMB_POSIX_ACL_MASK:
4350                         *p_tt = SMB_ACL_MASK;
4351                         break;
4352                 case SMB_POSIX_ACL_OTHER:
4353                         *p_tt = SMB_ACL_OTHER;
4354                         break;
4355                 default:
4356                         return False;
4357         }
4358         return True;
4359 }
4360
4361 /****************************************************************************
4362  Create a new POSIX acl from wire permissions.
4363  FIXME ! How does the share mask/mode fit into this.... ?
4364 ****************************************************************************/
4365
4366 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4367 {
4368         unsigned int i;
4369         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4370
4371         if (the_acl == NULL) {
4372                 return NULL;
4373         }
4374
4375         for (i = 0; i < num_acls; i++) {
4376                 SMB_ACL_ENTRY_T the_entry;
4377                 SMB_ACL_PERMSET_T the_permset;
4378                 SMB_ACL_TAG_T tag_type;
4379
4380                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4381                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4382                                 i, strerror(errno) ));
4383                         goto fail;
4384                 }
4385
4386                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4387                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4388                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4389                         goto fail;
4390                 }
4391
4392                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4393                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4394                                 i, strerror(errno) ));
4395                         goto fail;
4396                 }
4397
4398                 /* Get the permset pointer from the new ACL entry. */
4399                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4400                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4401                                 i, strerror(errno) ));
4402                         goto fail;
4403                 }
4404
4405                 /* Map from wire to permissions. */
4406                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4407                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4408                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4409                         goto fail;
4410                 }
4411
4412                 /* Now apply to the new ACL entry. */
4413                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4414                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4415                                 i, strerror(errno) ));
4416                         goto fail;
4417                 }
4418
4419                 if (tag_type == SMB_ACL_USER) {
4420                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4421                         uid_t uid = (uid_t)uidval;
4422                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4423                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4424                                         (unsigned int)uid, i, strerror(errno) ));
4425                                 goto fail;
4426                         }
4427                 }
4428
4429                 if (tag_type == SMB_ACL_GROUP) {
4430                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4431                         gid_t gid = (uid_t)gidval;
4432                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4433                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4434                                         (unsigned int)gid, i, strerror(errno) ));
4435                                 goto fail;
4436                         }
4437                 }
4438         }
4439
4440         return the_acl;
4441
4442  fail:
4443
4444         if (the_acl != NULL) {
4445                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4446         }
4447         return NULL;
4448 }
4449
4450 /****************************************************************************
4451  Calls from UNIX extensions - Default POSIX ACL set.
4452  If num_def_acls == 0 and not a directory just return. If it is a directory
4453  and num_def_acls == 0 then remove the default acl. Else set the default acl
4454  on the directory.
4455 ****************************************************************************/
4456
4457 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4458                                 uint16 num_def_acls, const char *pdata)
4459 {
4460         SMB_ACL_T def_acl = NULL;
4461
4462         if (!S_ISDIR(psbuf->st_ex_mode)) {
4463                 if (num_def_acls) {
4464                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4465                         errno = EISDIR;
4466                         return False;
4467                 } else {
4468                         return True;
4469                 }
4470         }
4471
4472         if (!num_def_acls) {
4473                 /* Remove the default ACL. */
4474                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4475                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4476                                 fname, strerror(errno) ));
4477                         return False;
4478                 }
4479                 return True;
4480         }
4481
4482         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4483                 return False;
4484         }
4485
4486         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4487                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4488                         fname, strerror(errno) ));
4489                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4490                 return False;
4491         }
4492
4493         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4494         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4495         return True;
4496 }
4497
4498 /****************************************************************************
4499  Remove an ACL from a file. As we don't have acl_delete_entry() available
4500  we must read the current acl and copy all entries except MASK, USER and GROUP
4501  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4502  removed.
4503  FIXME ! How does the share mask/mode fit into this.... ?
4504 ****************************************************************************/
4505
4506 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4507 {
4508         SMB_ACL_T file_acl = NULL;
4509         int entry_id = SMB_ACL_FIRST_ENTRY;
4510         SMB_ACL_ENTRY_T entry;
4511         bool ret = False;
4512         /* Create a new ACL with only 3 entries, u/g/w. */
4513         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4514         SMB_ACL_ENTRY_T user_ent = NULL;
4515         SMB_ACL_ENTRY_T group_ent = NULL;
4516         SMB_ACL_ENTRY_T other_ent = NULL;
4517
4518         if (new_file_acl == NULL) {
4519                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4520                 return False;
4521         }
4522
4523         /* Now create the u/g/w entries. */
4524         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4525                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4526                         fname, strerror(errno) ));
4527                 goto done;
4528         }
4529         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4530                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4531                         fname, strerror(errno) ));
4532                 goto done;
4533         }
4534
4535         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4536                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4537                         fname, strerror(errno) ));
4538                 goto done;
4539         }
4540         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4541                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4542                         fname, strerror(errno) ));
4543                 goto done;
4544         }
4545
4546         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4547                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4548                         fname, strerror(errno) ));
4549                 goto done;
4550         }
4551         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4552                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4553                         fname, strerror(errno) ));
4554                 goto done;
4555         }
4556
4557         /* Get the current file ACL. */
4558         if (fsp && fsp->fh->fd != -1) {
4559                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4560         } else {
4561                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4562         }
4563
4564         if (file_acl == NULL) {
4565                 /* This is only returned if an error occurred. Even for a file with
4566                    no acl a u/g/w acl should be returned. */
4567                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4568                         fname, strerror(errno) ));
4569                 goto done;
4570         }
4571
4572         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4573                 SMB_ACL_TAG_T tagtype;
4574                 SMB_ACL_PERMSET_T permset;
4575
4576                 entry_id = SMB_ACL_NEXT_ENTRY;
4577
4578                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4579                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4580                                 fname, strerror(errno) ));
4581                         goto done;
4582                 }
4583
4584                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4585                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4586                                 fname, strerror(errno) ));
4587                         goto done;
4588                 }
4589
4590                 if (tagtype == SMB_ACL_USER_OBJ) {
4591                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4592                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4593                                         fname, strerror(errno) ));
4594                         }
4595                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4596                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4597                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4598                                         fname, strerror(errno) ));
4599                         }
4600                 } else if (tagtype == SMB_ACL_OTHER) {
4601                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_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                 }
4606         }
4607
4608         /* Set the new empty file ACL. */
4609         if (fsp && fsp->fh->fd != -1) {
4610                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4611                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4612                                 fname, strerror(errno) ));
4613                         goto done;
4614                 }
4615         } else {
4616                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4617                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4618                                 fname, strerror(errno) ));
4619                         goto done;
4620                 }
4621         }
4622
4623         ret = True;
4624
4625  done:
4626
4627         if (file_acl) {
4628                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4629         }
4630         if (new_file_acl) {
4631                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4632         }
4633         return ret;
4634 }
4635
4636 /****************************************************************************
4637  Calls from UNIX extensions - POSIX ACL set.
4638  If num_def_acls == 0 then read/modify/write acl after removing all entries
4639  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4640 ****************************************************************************/
4641
4642 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4643 {
4644         SMB_ACL_T file_acl = NULL;
4645
4646         if (!num_acls) {
4647                 /* Remove the ACL from the file. */
4648                 return remove_posix_acl(conn, fsp, fname);
4649         }
4650
4651         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4652                 return False;
4653         }
4654
4655         if (fsp && fsp->fh->fd != -1) {
4656                 /* The preferred way - use an open fd. */
4657                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4658                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4659                                 fname, strerror(errno) ));
4660                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4661                         return False;
4662                 }
4663         } else {
4664                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4665                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4666                                 fname, strerror(errno) ));
4667                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4668                         return False;
4669                 }
4670         }
4671
4672         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4673         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4674         return True;
4675 }
4676
4677 /********************************************************************
4678  Pull the NT ACL from a file on disk or the OpenEventlog() access
4679  check.  Caller is responsible for freeing the returned security
4680  descriptor via TALLOC_FREE().  This is designed for dealing with
4681  user space access checks in smbd outside of the VFS.  For example,
4682  checking access rights in OpenEventlog().
4683
4684  Assume we are dealing with files (for now)
4685 ********************************************************************/
4686
4687 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4688 {
4689         SEC_DESC *psd, *ret_sd;
4690         connection_struct *conn;
4691         files_struct finfo;
4692         struct fd_handle fh;
4693         NTSTATUS status;
4694
4695         conn = TALLOC_ZERO_P(ctx, connection_struct);
4696         if (conn == NULL) {
4697                 DEBUG(0, ("talloc failed\n"));
4698                 return NULL;
4699         }
4700
4701         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4702                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4703                 TALLOC_FREE(conn);
4704                 return NULL;
4705         }
4706
4707         conn->params->service = -1;
4708
4709         set_conn_connectpath(conn, "/");
4710
4711         if (!smbd_vfs_init(conn)) {
4712                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4713                 conn_free(conn);
4714                 return NULL;
4715         }
4716
4717         ZERO_STRUCT( finfo );
4718         ZERO_STRUCT( fh );
4719
4720         finfo.fnum = -1;
4721         finfo.conn = conn;
4722         finfo.fh = &fh;
4723         finfo.fh->fd = -1;
4724
4725         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4726                                             &finfo.fsp_name);
4727         if (!NT_STATUS_IS_OK(status)) {
4728                 conn_free(conn);
4729                 return NULL;
4730         }
4731
4732         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4733                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4734                 TALLOC_FREE(finfo.fsp_name);
4735                 conn_free(conn);
4736                 return NULL;
4737         }
4738
4739         ret_sd = dup_sec_desc( ctx, psd );
4740
4741         TALLOC_FREE(finfo.fsp_name);
4742         conn_free(conn);
4743
4744         return ret_sd;
4745 }
4746
4747 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4748
4749 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4750                                         const char *name,
4751                                         SMB_STRUCT_STAT *psbuf,
4752                                         SEC_DESC **ppdesc)
4753 {
4754         struct dom_sid owner_sid, group_sid;
4755         size_t size = 0;
4756         SEC_ACE aces[4];
4757         uint32_t access_mask = 0;
4758         mode_t mode = psbuf->st_ex_mode;
4759         SEC_ACL *new_dacl = NULL;
4760         int idx = 0;
4761
4762         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4763                 name, (int)mode ));
4764
4765         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4766         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4767
4768         /*
4769          We provide up to 4 ACEs
4770                 - Owner
4771                 - Group
4772                 - Everyone
4773                 - NT System
4774         */
4775
4776         if (mode & S_IRUSR) {
4777                 if (mode & S_IWUSR) {
4778                         access_mask |= SEC_RIGHTS_FILE_ALL;
4779                 } else {
4780                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4781                 }
4782         }
4783         if (mode & S_IWUSR) {
4784                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4785         }
4786
4787         init_sec_ace(&aces[idx],
4788                         &owner_sid,
4789                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4790                         access_mask,
4791                         0);
4792         idx++;
4793
4794         access_mask = 0;
4795         if (mode & S_IRGRP) {
4796                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4797         }
4798         if (mode & S_IWGRP) {
4799                 /* note that delete is not granted - this matches posix behaviour */
4800                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4801         }
4802         if (access_mask) {
4803                 init_sec_ace(&aces[idx],
4804                         &group_sid,
4805                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4806                         access_mask,
4807                         0);
4808                 idx++;
4809         }
4810
4811         access_mask = 0;
4812         if (mode & S_IROTH) {
4813                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4814         }
4815         if (mode & S_IWOTH) {
4816                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4817         }
4818         if (access_mask) {
4819                 init_sec_ace(&aces[idx],
4820                         &global_sid_World,
4821                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4822                         access_mask,
4823                         0);
4824                 idx++;
4825         }
4826
4827         init_sec_ace(&aces[idx],
4828                         &global_sid_System,
4829                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4830                         SEC_RIGHTS_FILE_ALL,
4831                         0);
4832         idx++;
4833
4834         new_dacl = make_sec_acl(ctx,
4835                         NT4_ACL_REVISION,
4836                         idx,
4837                         aces);
4838
4839         if (!new_dacl) {
4840                 return NT_STATUS_NO_MEMORY;
4841         }
4842
4843         *ppdesc = make_sec_desc(ctx,
4844                         SECURITY_DESCRIPTOR_REVISION_1,
4845                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4846                         &owner_sid,
4847                         &group_sid,
4848                         NULL,
4849                         new_dacl,
4850                         &size);
4851         if (!*ppdesc) {
4852                 return NT_STATUS_NO_MEMORY;
4853         }
4854         return NT_STATUS_OK;
4855 }