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  Note we must not do this to default directory ACLs.
1488 ****************************************************************************/
1489
1490 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1491 {
1492         bool got_user_obj, got_group_obj;
1493         canon_ace *current_ace;
1494         int i, entries;
1495
1496         entries = count_canon_ace_list(ace);
1497         got_user_obj = False;
1498         got_group_obj = False;
1499
1500         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1501                 if (current_ace->type == SMB_ACL_USER_OBJ)
1502                         got_user_obj = True;
1503                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1504                         got_group_obj = True;
1505         }
1506         if (got_user_obj && got_group_obj) {
1507                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1508                 return;
1509         }
1510
1511         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1512                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1513                                 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1514                         current_ace->type = SMB_ACL_USER_OBJ;
1515                         got_user_obj = True;
1516                 }
1517                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1518                                 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1519                         current_ace->type = SMB_ACL_GROUP_OBJ;
1520                         got_group_obj = True;
1521                 }
1522         }
1523         if (!got_user_obj)
1524                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1525         if (!got_group_obj)
1526                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1527 }
1528
1529 /****************************************************************************
1530  Unpack a SEC_DESC into two canonical ace lists.
1531 ****************************************************************************/
1532
1533 static bool create_canon_ace_lists(files_struct *fsp,
1534                                         const SMB_STRUCT_STAT *pst,
1535                                         DOM_SID *pfile_owner_sid,
1536                                         DOM_SID *pfile_grp_sid,
1537                                         canon_ace **ppfile_ace,
1538                                         canon_ace **ppdir_ace,
1539                                         const SEC_ACL *dacl)
1540 {
1541         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1542         canon_ace *file_ace = NULL;
1543         canon_ace *dir_ace = NULL;
1544         canon_ace *current_ace = NULL;
1545         bool got_dir_allow = False;
1546         bool got_file_allow = False;
1547         int i, j;
1548
1549         *ppfile_ace = NULL;
1550         *ppdir_ace = NULL;
1551
1552         /*
1553          * Convert the incoming ACL into a more regular form.
1554          */
1555
1556         for(i = 0; i < dacl->num_aces; i++) {
1557                 SEC_ACE *psa = &dacl->aces[i];
1558
1559                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1560                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1561                         return False;
1562                 }
1563
1564                 if (nt4_compatible_acls()) {
1565                         /*
1566                          * The security mask may be UNIX_ACCESS_NONE which should map into
1567                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1568                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1569                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1570                          */
1571
1572                         /*
1573                          * Convert GENERIC bits to specific bits.
1574                          */
1575
1576                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1577
1578                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1579
1580                         if(psa->access_mask != UNIX_ACCESS_NONE)
1581                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1582                 }
1583         }
1584
1585         /*
1586          * Deal with the fact that NT 4.x re-writes the canonical format
1587          * that we return for default ACLs. If a directory ACE is identical
1588          * to a inherited directory ACE then NT changes the bits so that the
1589          * first ACE is set to OI|IO and the second ACE for this SID is set
1590          * to CI. We need to repair this. JRA.
1591          */
1592
1593         for(i = 0; i < dacl->num_aces; i++) {
1594                 SEC_ACE *psa1 = &dacl->aces[i];
1595
1596                 for (j = i + 1; j < dacl->num_aces; j++) {
1597                         SEC_ACE *psa2 = &dacl->aces[j];
1598
1599                         if (psa1->access_mask != psa2->access_mask)
1600                                 continue;
1601
1602                         if (!sid_equal(&psa1->trustee, &psa2->trustee))
1603                                 continue;
1604
1605                         /*
1606                          * Ok - permission bits and SIDs are equal.
1607                          * Check if flags were re-written.
1608                          */
1609
1610                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1611
1612                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1613                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1614
1615                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1616
1617                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1618                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1619
1620                         }
1621                 }
1622         }
1623
1624         for(i = 0; i < dacl->num_aces; i++) {
1625                 SEC_ACE *psa = &dacl->aces[i];
1626
1627                 /*
1628                  * Create a cannon_ace entry representing this NT DACL ACE.
1629                  */
1630
1631                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1632                         free_canon_ace_list(file_ace);
1633                         free_canon_ace_list(dir_ace);
1634                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1635                         return False;
1636                 }
1637
1638                 ZERO_STRUCTP(current_ace);
1639
1640                 sid_copy(&current_ace->trustee, &psa->trustee);
1641
1642                 /*
1643                  * Try and work out if the SID is a user or group
1644                  * as we need to flag these differently for POSIX.
1645                  * Note what kind of a POSIX ACL this should map to.
1646                  */
1647
1648                 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1649                         current_ace->owner_type = WORLD_ACE;
1650                         current_ace->unix_ug.world = -1;
1651                         current_ace->type = SMB_ACL_OTHER;
1652                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1653                         current_ace->owner_type = UID_ACE;
1654                         current_ace->unix_ug.uid = pst->st_ex_uid;
1655                         current_ace->type = SMB_ACL_USER_OBJ;
1656
1657                         /*
1658                          * The Creator Owner entry only specifies inheritable permissions,
1659                          * never access permissions. WinNT doesn't always set the ACE to
1660                          * INHERIT_ONLY, though.
1661                          */
1662
1663                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1664
1665                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1666                         current_ace->owner_type = GID_ACE;
1667                         current_ace->unix_ug.gid = pst->st_ex_gid;
1668                         current_ace->type = SMB_ACL_GROUP_OBJ;
1669
1670                         /*
1671                          * The Creator Group entry only specifies inheritable permissions,
1672                          * never access permissions. WinNT doesn't always set the ACE to
1673                          * INHERIT_ONLY, though.
1674                          */
1675                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1676
1677                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1678                         current_ace->owner_type = UID_ACE;
1679                         /* If it's the owning user, this is a user_obj, not
1680                          * a user. */
1681                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1682                                 current_ace->type = SMB_ACL_USER_OBJ;
1683                         } else {
1684                                 current_ace->type = SMB_ACL_USER;
1685                         }
1686                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1687                         current_ace->owner_type = GID_ACE;
1688                         /* If it's the primary group, this is a group_obj, not
1689                          * a group. */
1690                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1691                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1692                         } else {
1693                                 current_ace->type = SMB_ACL_GROUP;
1694                         }
1695                 } else {
1696                         /*
1697                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1698                          */
1699
1700                         if (non_mappable_sid(&psa->trustee)) {
1701                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1702                                            "non-mappable SID %s\n",
1703                                            sid_string_dbg(&psa->trustee)));
1704                                 SAFE_FREE(current_ace);
1705                                 continue;
1706                         }
1707
1708                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1709                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1710                                         "unknown or foreign SID %s\n",
1711                                         sid_string_dbg(&psa->trustee)));
1712                                         SAFE_FREE(current_ace);
1713                                 continue;
1714                         }
1715
1716                         free_canon_ace_list(file_ace);
1717                         free_canon_ace_list(dir_ace);
1718                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1719                                   "%s to uid or gid.\n",
1720                                   sid_string_dbg(&current_ace->trustee)));
1721                         SAFE_FREE(current_ace);
1722                         return False;
1723                 }
1724
1725                 /*
1726                  * Map the given NT permissions into a UNIX mode_t containing only
1727                  * S_I(R|W|X)USR bits.
1728                  */
1729
1730                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1731                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1732
1733                 /* Store the ace_flag. */
1734                 current_ace->ace_flags = psa->flags;
1735
1736                 /*
1737                  * Now add the created ace to either the file list, the directory
1738                  * list, or both. We *MUST* preserve the order here (hence we use
1739                  * DLIST_ADD_END) as NT ACLs are order dependent.
1740                  */
1741
1742                 if (fsp->is_directory) {
1743
1744                         /*
1745                          * We can only add to the default POSIX ACE list if the ACE is
1746                          * designed to be inherited by both files and directories.
1747                          */
1748
1749                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1750                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1751
1752                                 canon_ace *current_dir_ace = current_ace;
1753                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1754
1755                                 /*
1756                                  * Note if this was an allow ace. We can't process
1757                                  * any further deny ace's after this.
1758                                  */
1759
1760                                 if (current_ace->attr == ALLOW_ACE)
1761                                         got_dir_allow = True;
1762
1763                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1764                                         DEBUG(0,("create_canon_ace_lists: "
1765                                                  "malformed ACL in "
1766                                                  "inheritable ACL! Deny entry "
1767                                                  "after Allow entry. Failing "
1768                                                  "to set on file %s.\n",
1769                                                  fsp_str_dbg(fsp)));
1770                                         free_canon_ace_list(file_ace);
1771                                         free_canon_ace_list(dir_ace);
1772                                         return False;
1773                                 }
1774
1775                                 if( DEBUGLVL( 10 )) {
1776                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1777                                         print_canon_ace( current_ace, 0);
1778                                 }
1779
1780                                 /*
1781                                  * If this is not an inherit only ACE we need to add a duplicate
1782                                  * to the file acl.
1783                                  */
1784
1785                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1786                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1787
1788                                         if (!dup_ace) {
1789                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1790                                                 free_canon_ace_list(file_ace);
1791                                                 free_canon_ace_list(dir_ace);
1792                                                 return False;
1793                                         }
1794
1795                                         /*
1796                                          * We must not free current_ace here as its
1797                                          * pointer is now owned by the dir_ace list.
1798                                          */
1799                                         current_ace = dup_ace;
1800                                         /* We've essentially split this ace into two,
1801                                          * and added the ace with inheritance request
1802                                          * bits to the directory ACL. Drop those bits for
1803                                          * the ACE we're adding to the file list. */
1804                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1805                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1806                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1807                                 } else {
1808                                         /*
1809                                          * We must not free current_ace here as its
1810                                          * pointer is now owned by the dir_ace list.
1811                                          */
1812                                         current_ace = NULL;
1813                                 }
1814
1815                                 /*
1816                                  * current_ace is now either owned by file_ace
1817                                  * or is NULL. We can safely operate on current_dir_ace
1818                                  * to treat mapping for default acl entries differently
1819                                  * than access acl entries.
1820                                  */
1821
1822                                 if (current_dir_ace->owner_type == UID_ACE) {
1823                                         /*
1824                                          * We already decided above this is a uid,
1825                                          * for default acls ace's only CREATOR_OWNER
1826                                          * maps to ACL_USER_OBJ. All other uid
1827                                          * ace's are ACL_USER.
1828                                          */
1829                                         if (sid_equal(&current_dir_ace->trustee,
1830                                                         &global_sid_Creator_Owner)) {
1831                                                 current_dir_ace->type = SMB_ACL_USER_OBJ;
1832                                         } else {
1833                                                 current_dir_ace->type = SMB_ACL_USER;
1834                                         }
1835                                 }
1836
1837                                 if (current_dir_ace->owner_type == GID_ACE) {
1838                                         /*
1839                                          * We already decided above this is a gid,
1840                                          * for default acls ace's only CREATOR_GROUP
1841                                          * maps to ACL_GROUP_OBJ. All other uid
1842                                          * ace's are ACL_GROUP.
1843                                          */
1844                                         if (sid_equal(&current_dir_ace->trustee,
1845                                                         &global_sid_Creator_Group)) {
1846                                                 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1847                                         } else {
1848                                                 current_dir_ace->type = SMB_ACL_GROUP;
1849                                         }
1850                                 }
1851                         }
1852                 }
1853
1854                 /*
1855                  * Only add to the file ACL if not inherit only.
1856                  */
1857
1858                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1859                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1860
1861                         /*
1862                          * Note if this was an allow ace. We can't process
1863                          * any further deny ace's after this.
1864                          */
1865
1866                         if (current_ace->attr == ALLOW_ACE)
1867                                 got_file_allow = True;
1868
1869                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1870                                 DEBUG(0,("create_canon_ace_lists: malformed "
1871                                          "ACL in file ACL ! Deny entry after "
1872                                          "Allow entry. Failing to set on file "
1873                                          "%s.\n", fsp_str_dbg(fsp)));
1874                                 free_canon_ace_list(file_ace);
1875                                 free_canon_ace_list(dir_ace);
1876                                 return False;
1877                         }
1878
1879                         if( DEBUGLVL( 10 )) {
1880                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1881                                 print_canon_ace( current_ace, 0);
1882                         }
1883                         all_aces_are_inherit_only = False;
1884                         /*
1885                          * We must not free current_ace here as its
1886                          * pointer is now owned by the file_ace list.
1887                          */
1888                         current_ace = NULL;
1889                 }
1890
1891                 /*
1892                  * Free if ACE was not added.
1893                  */
1894
1895                 SAFE_FREE(current_ace);
1896         }
1897
1898         if (fsp->is_directory && all_aces_are_inherit_only) {
1899                 /*
1900                  * Windows 2000 is doing one of these weird 'inherit acl'
1901                  * traverses to conserve NTFS ACL resources. Just pretend
1902                  * there was no DACL sent. JRA.
1903                  */
1904
1905                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1906                 free_canon_ace_list(file_ace);
1907                 free_canon_ace_list(dir_ace);
1908                 file_ace = NULL;
1909                 dir_ace = NULL;
1910         } else {
1911                 /*
1912                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
1913                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1914                  * entries can be converted to *_OBJ. Don't do this for the default
1915                  * ACL, we will create them separately for this if needed inside
1916                  * ensure_canon_entry_valid().
1917                  */
1918                 if (file_ace) {
1919                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1920                 }
1921         }
1922
1923         *ppfile_ace = file_ace;
1924         *ppdir_ace = dir_ace;
1925
1926         return True;
1927 }
1928
1929 /****************************************************************************
1930  ASCII art time again... JRA :-).
1931
1932  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1933  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1934  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1935  allow or deny have been merged, so the same SID can only appear once in the deny
1936  list or once in the allow list.
1937
1938  We then process as follows :
1939
1940  ---------------------------------------------------------------------------
1941  First pass - look for a Everyone DENY entry.
1942
1943  If it is deny all (rwx) trunate the list at this point.
1944  Else, walk the list from this point and use the deny permissions of this
1945  entry as a mask on all following allow entries. Finally, delete
1946  the Everyone DENY entry (we have applied it to everything possible).
1947
1948  In addition, in this pass we remove any DENY entries that have
1949  no permissions (ie. they are a DENY nothing).
1950  ---------------------------------------------------------------------------
1951  Second pass - only deal with deny user entries.
1952
1953  DENY user1 (perms XXX)
1954
1955  new_perms = 0
1956  for all following allow group entries where user1 is in group
1957         new_perms |= group_perms;
1958
1959  user1 entry perms = new_perms & ~ XXX;
1960
1961  Convert the deny entry to an allow entry with the new perms and
1962  push to the end of the list. Note if the user was in no groups
1963  this maps to a specific allow nothing entry for this user.
1964
1965  The common case from the NT ACL choser (userX deny all) is
1966  optimised so we don't do the group lookup - we just map to
1967  an allow nothing entry.
1968
1969  What we're doing here is inferring the allow permissions the
1970  person setting the ACE on user1 wanted by looking at the allow
1971  permissions on the groups the user is currently in. This will
1972  be a snapshot, depending on group membership but is the best
1973  we can do and has the advantage of failing closed rather than
1974  open.
1975  ---------------------------------------------------------------------------
1976  Third pass - only deal with deny group entries.
1977
1978  DENY group1 (perms XXX)
1979
1980  for all following allow user entries where user is in group1
1981    user entry perms = user entry perms & ~ XXX;
1982
1983  If there is a group Everyone allow entry with permissions YYY,
1984  convert the group1 entry to an allow entry and modify its
1985  permissions to be :
1986
1987  new_perms = YYY & ~ XXX
1988
1989  and push to the end of the list.
1990
1991  If there is no group Everyone allow entry then convert the
1992  group1 entry to a allow nothing entry and push to the end of the list.
1993
1994  Note that the common case from the NT ACL choser (groupX deny all)
1995  cannot be optimised here as we need to modify user entries who are
1996  in the group to change them to a deny all also.
1997
1998  What we're doing here is modifying the allow permissions of
1999  user entries (which are more specific in POSIX ACLs) to mask
2000  out the explicit deny set on the group they are in. This will
2001  be a snapshot depending on current group membership but is the
2002  best we can do and has the advantage of failing closed rather
2003  than open.
2004  ---------------------------------------------------------------------------
2005  Fourth pass - cope with cumulative permissions.
2006
2007  for all allow user entries, if there exists an allow group entry with
2008  more permissive permissions, and the user is in that group, rewrite the
2009  allow user permissions to contain both sets of permissions.
2010
2011  Currently the code for this is #ifdef'ed out as these semantics make
2012  no sense to me. JRA.
2013  ---------------------------------------------------------------------------
2014
2015  Note we *MUST* do the deny user pass first as this will convert deny user
2016  entries into allow user entries which can then be processed by the deny
2017  group pass.
2018
2019  The above algorithm took a *lot* of thinking about - hence this
2020  explaination :-). JRA.
2021 ****************************************************************************/
2022
2023 /****************************************************************************
2024  Process a canon_ace list entries. This is very complex code. We need
2025  to go through and remove the "deny" permissions from any allow entry that matches
2026  the id of this entry. We have already refused any NT ACL that wasn't in correct
2027  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2028  we just remove it (to fail safe). We have already removed any duplicate ace
2029  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2030  allow entries.
2031 ****************************************************************************/
2032
2033 static void process_deny_list( canon_ace **pp_ace_list )
2034 {
2035         canon_ace *ace_list = *pp_ace_list;
2036         canon_ace *curr_ace = NULL;
2037         canon_ace *curr_ace_next = NULL;
2038
2039         /* Pass 1 above - look for an Everyone, deny entry. */
2040
2041         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2042                 canon_ace *allow_ace_p;
2043
2044                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2045
2046                 if (curr_ace->attr != DENY_ACE)
2047                         continue;
2048
2049                 if (curr_ace->perms == (mode_t)0) {
2050
2051                         /* Deny nothing entry - delete. */
2052
2053                         DLIST_REMOVE(ace_list, curr_ace);
2054                         continue;
2055                 }
2056
2057                 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2058                         continue;
2059
2060                 /* JRATEST - assert. */
2061                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2062
2063                 if (curr_ace->perms == ALL_ACE_PERMS) {
2064
2065                         /*
2066                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2067                          * list at this point including this entry.
2068                          */
2069
2070                         canon_ace *prev_entry = curr_ace->prev;
2071
2072                         free_canon_ace_list( curr_ace );
2073                         if (prev_entry)
2074                                 prev_entry->next = NULL;
2075                         else {
2076                                 /* We deleted the entire list. */
2077                                 ace_list = NULL;
2078                         }
2079                         break;
2080                 }
2081
2082                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2083
2084                         /*
2085                          * Only mask off allow entries.
2086                          */
2087
2088                         if (allow_ace_p->attr != ALLOW_ACE)
2089                                 continue;
2090
2091                         allow_ace_p->perms &= ~curr_ace->perms;
2092                 }
2093
2094                 /*
2095                  * Now it's been applied, remove it.
2096                  */
2097
2098                 DLIST_REMOVE(ace_list, curr_ace);
2099         }
2100
2101         /* Pass 2 above - deal with deny user entries. */
2102
2103         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2104                 mode_t new_perms = (mode_t)0;
2105                 canon_ace *allow_ace_p;
2106
2107                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2108
2109                 if (curr_ace->attr != DENY_ACE)
2110                         continue;
2111
2112                 if (curr_ace->owner_type != UID_ACE)
2113                         continue;
2114
2115                 if (curr_ace->perms == ALL_ACE_PERMS) {
2116
2117                         /*
2118                          * Optimisation - this is a deny everything to this user.
2119                          * Convert to an allow nothing and push to the end of the list.
2120                          */
2121
2122                         curr_ace->attr = ALLOW_ACE;
2123                         curr_ace->perms = (mode_t)0;
2124                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2125                         continue;
2126                 }
2127
2128                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2129
2130                         if (allow_ace_p->attr != ALLOW_ACE)
2131                                 continue;
2132
2133                         /* We process GID_ACE and WORLD_ACE entries only. */
2134
2135                         if (allow_ace_p->owner_type == UID_ACE)
2136                                 continue;
2137
2138                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2139                                 new_perms |= allow_ace_p->perms;
2140                 }
2141
2142                 /*
2143                  * Convert to a allow entry, modify the perms and push to the end
2144                  * of the list.
2145                  */
2146
2147                 curr_ace->attr = ALLOW_ACE;
2148                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2149                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2150         }
2151
2152         /* Pass 3 above - deal with deny group entries. */
2153
2154         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2155                 canon_ace *allow_ace_p;
2156                 canon_ace *allow_everyone_p = NULL;
2157
2158                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2159
2160                 if (curr_ace->attr != DENY_ACE)
2161                         continue;
2162
2163                 if (curr_ace->owner_type != GID_ACE)
2164                         continue;
2165
2166                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2167
2168                         if (allow_ace_p->attr != ALLOW_ACE)
2169                                 continue;
2170
2171                         /* Store a pointer to the Everyone allow, if it exists. */
2172                         if (allow_ace_p->owner_type == WORLD_ACE)
2173                                 allow_everyone_p = allow_ace_p;
2174
2175                         /* We process UID_ACE entries only. */
2176
2177                         if (allow_ace_p->owner_type != UID_ACE)
2178                                 continue;
2179
2180                         /* Mask off the deny group perms. */
2181
2182                         if (uid_entry_in_group( allow_ace_p, curr_ace))
2183                                 allow_ace_p->perms &= ~curr_ace->perms;
2184                 }
2185
2186                 /*
2187                  * Convert the deny to an allow with the correct perms and
2188                  * push to the end of the list.
2189                  */
2190
2191                 curr_ace->attr = ALLOW_ACE;
2192                 if (allow_everyone_p)
2193                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2194                 else
2195                         curr_ace->perms = (mode_t)0;
2196                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2197         }
2198
2199         /* Doing this fourth pass allows Windows semantics to be layered
2200          * on top of POSIX semantics. I'm not sure if this is desirable.
2201          * For example, in W2K ACLs there is no way to say, "Group X no
2202          * access, user Y full access" if user Y is a member of group X.
2203          * This seems completely broken semantics to me.... JRA.
2204          */
2205
2206 #if 0
2207         /* Pass 4 above - deal with allow entries. */
2208
2209         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2210                 canon_ace *allow_ace_p;
2211
2212                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2213
2214                 if (curr_ace->attr != ALLOW_ACE)
2215                         continue;
2216
2217                 if (curr_ace->owner_type != UID_ACE)
2218                         continue;
2219
2220                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2221
2222                         if (allow_ace_p->attr != ALLOW_ACE)
2223                                 continue;
2224
2225                         /* We process GID_ACE entries only. */
2226
2227                         if (allow_ace_p->owner_type != GID_ACE)
2228                                 continue;
2229
2230                         /* OR in the group perms. */
2231
2232                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2233                                 curr_ace->perms |= allow_ace_p->perms;
2234                 }
2235         }
2236 #endif
2237
2238         *pp_ace_list = ace_list;
2239 }
2240
2241 /****************************************************************************
2242  Create a default mode that will be used if a security descriptor entry has
2243  no user/group/world entries.
2244 ****************************************************************************/
2245
2246 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2247 {
2248         int snum = SNUM(fsp->conn);
2249         mode_t and_bits = (mode_t)0;
2250         mode_t or_bits = (mode_t)0;
2251         mode_t mode;
2252
2253         if (interitable_mode) {
2254                 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2255                                  fsp->fsp_name, NULL);
2256         } else {
2257                 mode = S_IRUSR;
2258         }
2259
2260         if (fsp->is_directory)
2261                 mode |= (S_IWUSR|S_IXUSR);
2262
2263         /*
2264          * Now AND with the create mode/directory mode bits then OR with the
2265          * force create mode/force directory mode bits.
2266          */
2267
2268         if (fsp->is_directory) {
2269                 and_bits = lp_dir_security_mask(snum);
2270                 or_bits = lp_force_dir_security_mode(snum);
2271         } else {
2272                 and_bits = lp_security_mask(snum);
2273                 or_bits = lp_force_security_mode(snum);
2274         }
2275
2276         return ((mode & and_bits)|or_bits);
2277 }
2278
2279 /****************************************************************************
2280  Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2281  succeeding.
2282 ****************************************************************************/
2283
2284 static bool unpack_canon_ace(files_struct *fsp,
2285                                 const SMB_STRUCT_STAT *pst,
2286                                 DOM_SID *pfile_owner_sid,
2287                                 DOM_SID *pfile_grp_sid,
2288                                 canon_ace **ppfile_ace,
2289                                 canon_ace **ppdir_ace,
2290                                 uint32 security_info_sent,
2291                                 const SEC_DESC *psd)
2292 {
2293         SMB_STRUCT_STAT st;
2294         canon_ace *file_ace = NULL;
2295         canon_ace *dir_ace = NULL;
2296
2297         *ppfile_ace = NULL;
2298         *ppdir_ace = NULL;
2299
2300         if(security_info_sent == 0) {
2301                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2302                 return False;
2303         }
2304
2305         /*
2306          * If no DACL then this is a chown only security descriptor.
2307          */
2308
2309         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2310                 return True;
2311
2312         /*
2313          * Now go through the DACL and create the canon_ace lists.
2314          */
2315
2316         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2317                                                                 &file_ace, &dir_ace, psd->dacl))
2318                 return False;
2319
2320         if ((file_ace == NULL) && (dir_ace == NULL)) {
2321                 /* W2K traverse DACL set - ignore. */
2322                 return True;
2323         }
2324
2325         /*
2326          * Go through the canon_ace list and merge entries
2327          * belonging to identical users of identical allow or deny type.
2328          * We can do this as all deny entries come first, followed by
2329          * all allow entries (we have mandated this before accepting this acl).
2330          */
2331
2332         print_canon_ace_list( "file ace - before merge", file_ace);
2333         merge_aces( &file_ace, false);
2334
2335         print_canon_ace_list( "dir ace - before merge", dir_ace);
2336         merge_aces( &dir_ace, true);
2337
2338         /*
2339          * NT ACLs are order dependent. Go through the acl lists and
2340          * process DENY entries by masking the allow entries.
2341          */
2342
2343         print_canon_ace_list( "file ace - before deny", file_ace);
2344         process_deny_list( &file_ace);
2345
2346         print_canon_ace_list( "dir ace - before deny", dir_ace);
2347         process_deny_list( &dir_ace);
2348
2349         /*
2350          * A well formed POSIX file or default ACL has at least 3 entries, a
2351          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2352          * and optionally a mask entry. Ensure this is the case.
2353          */
2354
2355         print_canon_ace_list( "file ace - before valid", file_ace);
2356
2357         st = *pst;
2358
2359         /*
2360          * A default 3 element mode entry for a file should be r-- --- ---.
2361          * A default 3 element mode entry for a directory should be rwx --- ---.
2362          */
2363
2364         st.st_ex_mode = create_default_mode(fsp, False);
2365
2366         if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params,
2367                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2368                 free_canon_ace_list(file_ace);
2369                 free_canon_ace_list(dir_ace);
2370                 return False;
2371         }
2372
2373         print_canon_ace_list( "dir ace - before valid", dir_ace);
2374
2375         /*
2376          * A default inheritable 3 element mode entry for a directory should be the
2377          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2378          * it's a directory.
2379          */
2380
2381         st.st_ex_mode = create_default_mode(fsp, True);
2382
2383         if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params,
2384                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2385                 free_canon_ace_list(file_ace);
2386                 free_canon_ace_list(dir_ace);
2387                 return False;
2388         }
2389
2390         print_canon_ace_list( "file ace - return", file_ace);
2391         print_canon_ace_list( "dir ace - return", dir_ace);
2392
2393         *ppfile_ace = file_ace;
2394         *ppdir_ace = dir_ace;
2395         return True;
2396
2397 }
2398
2399 /******************************************************************************
2400  When returning permissions, try and fit NT display
2401  semantics if possible. Note the the canon_entries here must have been malloced.
2402  The list format should be - first entry = owner, followed by group and other user
2403  entries, last entry = other.
2404
2405  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2406  are not ordered, and match on the most specific entry rather than walking a list,
2407  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2408
2409  Entry 0: owner : deny all except read and write.
2410  Entry 1: owner : allow read and write.
2411  Entry 2: group : deny all except read.
2412  Entry 3: group : allow read.
2413  Entry 4: Everyone : allow read.
2414
2415  But NT cannot display this in their ACL editor !
2416 ********************************************************************************/
2417
2418 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2419 {
2420         canon_ace *l_head = *pp_list_head;
2421         canon_ace *owner_ace = NULL;
2422         canon_ace *other_ace = NULL;
2423         canon_ace *ace = NULL;
2424
2425         for (ace = l_head; ace; ace = ace->next) {
2426                 if (ace->type == SMB_ACL_USER_OBJ)
2427                         owner_ace = ace;
2428                 else if (ace->type == SMB_ACL_OTHER) {
2429                         /* Last ace - this is "other" */
2430                         other_ace = ace;
2431                 }
2432         }
2433
2434         if (!owner_ace || !other_ace) {
2435                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2436                         filename ));
2437                 return;
2438         }
2439
2440         /*
2441          * The POSIX algorithm applies to owner first, and other last,
2442          * so ensure they are arranged in this order.
2443          */
2444
2445         if (owner_ace) {
2446                 DLIST_PROMOTE(l_head, owner_ace);
2447         }
2448
2449         if (other_ace) {
2450                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2451         }
2452
2453         /* We have probably changed the head of the list. */
2454
2455         *pp_list_head = l_head;
2456 }
2457
2458 /****************************************************************************
2459  Create a linked list of canonical ACE entries.
2460 ****************************************************************************/
2461
2462 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2463                                    const char *fname, SMB_ACL_T posix_acl,
2464                                    const SMB_STRUCT_STAT *psbuf,
2465                                    const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2466 {
2467         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2468         canon_ace *l_head = NULL;
2469         canon_ace *ace = NULL;
2470         canon_ace *next_ace = NULL;
2471         int entry_id = SMB_ACL_FIRST_ENTRY;
2472         SMB_ACL_ENTRY_T entry;
2473         size_t ace_count;
2474
2475         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2476                 SMB_ACL_TAG_T tagtype;
2477                 SMB_ACL_PERMSET_T permset;
2478                 DOM_SID sid;
2479                 posix_id unix_ug;
2480                 enum ace_owner owner_type;
2481
2482                 entry_id = SMB_ACL_NEXT_ENTRY;
2483
2484                 /* Is this a MASK entry ? */
2485                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2486                         continue;
2487
2488                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2489                         continue;
2490
2491                 /* Decide which SID to use based on the ACL type. */
2492                 switch(tagtype) {
2493                         case SMB_ACL_USER_OBJ:
2494                                 /* Get the SID from the owner. */
2495                                 sid_copy(&sid, powner);
2496                                 unix_ug.uid = psbuf->st_ex_uid;
2497                                 owner_type = UID_ACE;
2498                                 break;
2499                         case SMB_ACL_USER:
2500                                 {
2501                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2502                                         if (puid == NULL) {
2503                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2504                                                 continue;
2505                                         }
2506                                         uid_to_sid( &sid, *puid);
2507                                         unix_ug.uid = *puid;
2508                                         owner_type = UID_ACE;
2509                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2510                                         break;
2511                                 }
2512                         case SMB_ACL_GROUP_OBJ:
2513                                 /* Get the SID from the owning group. */
2514                                 sid_copy(&sid, pgroup);
2515                                 unix_ug.gid = psbuf->st_ex_gid;
2516                                 owner_type = GID_ACE;
2517                                 break;
2518                         case SMB_ACL_GROUP:
2519                                 {
2520                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2521                                         if (pgid == NULL) {
2522                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2523                                                 continue;
2524                                         }
2525                                         gid_to_sid( &sid, *pgid);
2526                                         unix_ug.gid = *pgid;
2527                                         owner_type = GID_ACE;
2528                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2529                                         break;
2530                                 }
2531                         case SMB_ACL_MASK:
2532                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2533                                 continue; /* Don't count the mask as an entry. */
2534                         case SMB_ACL_OTHER:
2535                                 /* Use the Everyone SID */
2536                                 sid = global_sid_World;
2537                                 unix_ug.world = -1;
2538                                 owner_type = WORLD_ACE;
2539                                 break;
2540                         default:
2541                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2542                                 continue;
2543                 }
2544
2545                 /*
2546                  * Add this entry to the list.
2547                  */
2548
2549                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2550                         goto fail;
2551
2552                 ZERO_STRUCTP(ace);
2553                 ace->type = tagtype;
2554                 ace->perms = convert_permset_to_mode_t(conn, permset);
2555                 ace->attr = ALLOW_ACE;
2556                 ace->trustee = sid;
2557                 ace->unix_ug = unix_ug;
2558                 ace->owner_type = owner_type;
2559                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2560
2561                 DLIST_ADD(l_head, ace);
2562         }
2563
2564         /*
2565          * This next call will ensure we have at least a user/group/world set.
2566          */
2567
2568         if (!ensure_canon_entry_valid(&l_head, conn->params,
2569                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2570                                       psbuf, False))
2571                 goto fail;
2572
2573         /*
2574          * Now go through the list, masking the permissions with the
2575          * acl_mask. Ensure all DENY Entries are at the start of the list.
2576          */
2577
2578         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2579
2580         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2581                 next_ace = ace->next;
2582
2583                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2584                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2585                         ace->perms &= acl_mask;
2586
2587                 if (ace->perms == 0) {
2588                         DLIST_PROMOTE(l_head, ace);
2589                 }
2590
2591                 if( DEBUGLVL( 10 ) ) {
2592                         print_canon_ace(ace, ace_count);
2593                 }
2594         }
2595
2596         arrange_posix_perms(fname,&l_head );
2597
2598         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2599
2600         return l_head;
2601
2602   fail:
2603
2604         free_canon_ace_list(l_head);
2605         return NULL;
2606 }
2607
2608 /****************************************************************************
2609  Check if the current user group list contains a given group.
2610 ****************************************************************************/
2611
2612 bool current_user_in_group(gid_t gid)
2613 {
2614         int i;
2615
2616         for (i = 0; i < current_user.ut.ngroups; i++) {
2617                 if (current_user.ut.groups[i] == gid) {
2618                         return True;
2619                 }
2620         }
2621
2622         return False;
2623 }
2624
2625 /****************************************************************************
2626  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2627 ****************************************************************************/
2628
2629 static bool acl_group_override(connection_struct *conn,
2630                                const struct smb_filename *smb_fname)
2631 {
2632         if ((errno != EPERM) && (errno != EACCES)) {
2633                 return false;
2634         }
2635
2636         /* file primary group == user primary or supplementary group */
2637         if (lp_acl_group_control(SNUM(conn)) &&
2638             current_user_in_group(smb_fname->st.st_ex_gid)) {
2639                 return true;
2640         }
2641
2642         /* user has writeable permission */
2643         if (lp_dos_filemode(SNUM(conn)) &&
2644             can_write_to_file(conn, smb_fname)) {
2645                 return true;
2646         }
2647
2648         return false;
2649 }
2650
2651 /****************************************************************************
2652  Attempt to apply an ACL to a file or directory.
2653 ****************************************************************************/
2654
2655 static bool set_canon_ace_list(files_struct *fsp,
2656                                 canon_ace *the_ace,
2657                                 bool default_ace,
2658                                 const SMB_STRUCT_STAT *psbuf,
2659                                 bool *pacl_set_support)
2660 {
2661         connection_struct *conn = fsp->conn;
2662         bool ret = False;
2663         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2664         canon_ace *p_ace;
2665         int i;
2666         SMB_ACL_ENTRY_T mask_entry;
2667         bool got_mask_entry = False;
2668         SMB_ACL_PERMSET_T mask_permset;
2669         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2670         bool needs_mask = False;
2671         mode_t mask_perms = 0;
2672
2673         /* Use the psbuf that was passed in. */
2674         if (psbuf != &fsp->fsp_name->st) {
2675                 fsp->fsp_name->st = *psbuf;
2676         }
2677
2678 #if defined(POSIX_ACL_NEEDS_MASK)
2679         /* HP-UX always wants to have a mask (called "class" there). */
2680         needs_mask = True;
2681 #endif
2682
2683         if (the_acl == NULL) {
2684
2685                 if (!no_acl_syscall_error(errno)) {
2686                         /*
2687                          * Only print this error message if we have some kind of ACL
2688                          * support that's not working. Otherwise we would always get this.
2689                          */
2690                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2691                                 default_ace ? "default" : "file", strerror(errno) ));
2692                 }
2693                 *pacl_set_support = False;
2694                 goto fail;
2695         }
2696
2697         if( DEBUGLVL( 10 )) {
2698                 dbgtext("set_canon_ace_list: setting ACL:\n");
2699                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2700                         print_canon_ace( p_ace, i);
2701                 }
2702         }
2703
2704         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2705                 SMB_ACL_ENTRY_T the_entry;
2706                 SMB_ACL_PERMSET_T the_permset;
2707
2708                 /*
2709                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2710                  * named group entries. But if there is an ACL_MASK entry, it applies
2711                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2712                  * so that it doesn't deny (i.e., mask off) any permissions.
2713                  */
2714
2715                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2716                         needs_mask = True;
2717                         mask_perms |= p_ace->perms;
2718                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2719                         mask_perms |= p_ace->perms;
2720                 }
2721
2722                 /*
2723                  * Get the entry for this ACE.
2724                  */
2725
2726                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2727                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2728                                 i, strerror(errno) ));
2729                         goto fail;
2730                 }
2731
2732                 if (p_ace->type == SMB_ACL_MASK) {
2733                         mask_entry = the_entry;
2734                         got_mask_entry = True;
2735                 }
2736
2737                 /*
2738                  * Ok - we now know the ACL calls should be working, don't
2739                  * allow fallback to chmod.
2740                  */
2741
2742                 *pacl_set_support = True;
2743
2744                 /*
2745                  * Initialise the entry from the canon_ace.
2746                  */
2747
2748                 /*
2749                  * First tell the entry what type of ACE this is.
2750                  */
2751
2752                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2753                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2754                                 i, strerror(errno) ));
2755                         goto fail;
2756                 }
2757
2758                 /*
2759                  * Only set the qualifier (user or group id) if the entry is a user
2760                  * or group id ACE.
2761                  */
2762
2763                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2764                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2765                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2766                                         i, strerror(errno) ));
2767                                 goto fail;
2768                         }
2769                 }
2770
2771                 /*
2772                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2773                  */
2774
2775                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2776                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2777                                 i, strerror(errno) ));
2778                         goto fail;
2779                 }
2780
2781                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2782                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2783                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2784                         goto fail;
2785                 }
2786
2787                 /*
2788                  * ..and apply them to the entry.
2789                  */
2790
2791                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2792                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2793                                 i, strerror(errno) ));
2794                         goto fail;
2795                 }
2796
2797                 if( DEBUGLVL( 10 ))
2798                         print_canon_ace( p_ace, i);
2799
2800         }
2801
2802         if (needs_mask && !got_mask_entry) {
2803                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2804                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2805                         goto fail;
2806                 }
2807
2808                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2809                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2810                         goto fail;
2811                 }
2812
2813                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2814                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2815                         goto fail;
2816                 }
2817
2818                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2819                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2820                         goto fail;
2821                 }
2822
2823                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2824                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2825                         goto fail;
2826                 }
2827         }
2828
2829         /*
2830          * Finally apply it to the file or directory.
2831          */
2832
2833         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2834                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2835                                              the_acl_type, the_acl) == -1) {
2836                         /*
2837                          * Some systems allow all the above calls and only fail with no ACL support
2838                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2839                          */
2840                         if (no_acl_syscall_error(errno)) {
2841                                 *pacl_set_support = False;
2842                         }
2843
2844                         if (acl_group_override(conn, fsp->fsp_name)) {
2845                                 int sret;
2846
2847                                 DEBUG(5,("set_canon_ace_list: acl group "
2848                                          "control on and current user in file "
2849                                          "%s primary group.\n",
2850                                          fsp_str_dbg(fsp)));
2851
2852                                 become_root();
2853                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2854                                     fsp->fsp_name->base_name, the_acl_type,
2855                                     the_acl);
2856                                 unbecome_root();
2857                                 if (sret == 0) {
2858                                         ret = True;
2859                                 }
2860                         }
2861
2862                         if (ret == False) {
2863                                 DEBUG(2,("set_canon_ace_list: "
2864                                          "sys_acl_set_file type %s failed for "
2865                                          "file %s (%s).\n",
2866                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2867                                          "directory default" : "file",
2868                                          fsp_str_dbg(fsp), strerror(errno)));
2869                                 goto fail;
2870                         }
2871                 }
2872         } else {
2873                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2874                         /*
2875                          * Some systems allow all the above calls and only fail with no ACL support
2876                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2877                          */
2878                         if (no_acl_syscall_error(errno)) {
2879                                 *pacl_set_support = False;
2880                         }
2881
2882                         if (acl_group_override(conn, fsp->fsp_name)) {
2883                                 int sret;
2884
2885                                 DEBUG(5,("set_canon_ace_list: acl group "
2886                                          "control on and current user in file "
2887                                          "%s primary group.\n",
2888                                          fsp_str_dbg(fsp)));
2889
2890                                 become_root();
2891                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2892                                 unbecome_root();
2893                                 if (sret == 0) {
2894                                         ret = True;
2895                                 }
2896                         }
2897
2898                         if (ret == False) {
2899                                 DEBUG(2,("set_canon_ace_list: "
2900                                          "sys_acl_set_file failed for file %s "
2901                                          "(%s).\n",
2902                                          fsp_str_dbg(fsp), strerror(errno)));
2903                                 goto fail;
2904                         }
2905                 }
2906         }
2907
2908         ret = True;
2909
2910   fail:
2911
2912         if (the_acl != NULL) {
2913                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2914         }
2915
2916         return ret;
2917 }
2918
2919 /****************************************************************************
2920  Find a particular canon_ace entry.
2921 ****************************************************************************/
2922
2923 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2924 {
2925         while (list) {
2926                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2927                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2928                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2929                         break;
2930                 list = list->next;
2931         }
2932         return list;
2933 }
2934
2935 /****************************************************************************
2936
2937 ****************************************************************************/
2938
2939 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2940 {
2941         SMB_ACL_ENTRY_T entry;
2942
2943         if (!the_acl)
2944                 return NULL;
2945         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2946                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2947                 return NULL;
2948         }
2949         return the_acl;
2950 }
2951
2952 /****************************************************************************
2953  Convert a canon_ace to a generic 3 element permission - if possible.
2954 ****************************************************************************/
2955
2956 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2957
2958 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2959 {
2960         int snum = SNUM(fsp->conn);
2961         size_t ace_count = count_canon_ace_list(file_ace_list);
2962         canon_ace *ace_p;
2963         canon_ace *owner_ace = NULL;
2964         canon_ace *group_ace = NULL;
2965         canon_ace *other_ace = NULL;
2966         mode_t and_bits;
2967         mode_t or_bits;
2968
2969         if (ace_count != 3) {
2970                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2971                          "entries for file %s to convert to posix perms.\n",
2972                          fsp_str_dbg(fsp)));
2973                 return False;
2974         }
2975
2976         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2977                 if (ace_p->owner_type == UID_ACE)
2978                         owner_ace = ace_p;
2979                 else if (ace_p->owner_type == GID_ACE)
2980                         group_ace = ace_p;
2981                 else if (ace_p->owner_type == WORLD_ACE)
2982                         other_ace = ace_p;
2983         }
2984
2985         if (!owner_ace || !group_ace || !other_ace) {
2986                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
2987                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
2988                 return False;
2989         }
2990
2991         *posix_perms = (mode_t)0;
2992
2993         *posix_perms |= owner_ace->perms;
2994         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2995         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2996         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2997         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2998         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2999         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3000
3001         /* The owner must have at least read access. */
3002
3003         *posix_perms |= S_IRUSR;
3004         if (fsp->is_directory)
3005                 *posix_perms |= (S_IWUSR|S_IXUSR);
3006
3007         /* If requested apply the masks. */
3008
3009         /* Get the initial bits to apply. */
3010
3011         if (fsp->is_directory) {
3012                 and_bits = lp_dir_security_mask(snum);
3013                 or_bits = lp_force_dir_security_mode(snum);
3014         } else {
3015                 and_bits = lp_security_mask(snum);
3016                 or_bits = lp_force_security_mode(snum);
3017         }
3018
3019         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3020
3021         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3022                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3023                   (int)group_ace->perms, (int)other_ace->perms,
3024                   (int)*posix_perms, fsp_str_dbg(fsp)));
3025
3026         return True;
3027 }
3028
3029 /****************************************************************************
3030   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3031   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3032   with CI|OI set so it is inherited and also applies to the directory.
3033   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3034 ****************************************************************************/
3035
3036 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
3037 {
3038         size_t i, j;
3039
3040         for (i = 0; i < num_aces; i++) {
3041                 for (j = i+1; j < num_aces; j++) {
3042                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3043                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3044                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3045                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3046
3047                         /* We know the lower number ACE's are file entries. */
3048                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3049                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3050                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3051                                 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3052                                 (i_inh == j_inh) &&
3053                                 (i_flags_ni == 0) &&
3054                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3055                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3056                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3057                                 /*
3058                                  * W2K wants to have access allowed zero access ACE's
3059                                  * at the end of the list. If the mask is zero, merge
3060                                  * the non-inherited ACE onto the inherited ACE.
3061                                  */
3062
3063                                 if (nt_ace_list[i].access_mask == 0) {
3064                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3065                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3066                                         if (num_aces - i - 1 > 0)
3067                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3068                                                                 sizeof(SEC_ACE));
3069
3070                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3071                                                 (unsigned int)i, (unsigned int)j ));
3072                                 } else {
3073                                         /*
3074                                          * These are identical except for the flags.
3075                                          * Merge the inherited ACE onto the non-inherited ACE.
3076                                          */
3077
3078                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3079                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3080                                         if (num_aces - j - 1 > 0)
3081                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3082                                                                 sizeof(SEC_ACE));
3083
3084                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3085                                                 (unsigned int)j, (unsigned int)i ));
3086                                 }
3087                                 num_aces--;
3088                                 break;
3089                         }
3090                 }
3091         }
3092
3093         return num_aces;
3094 }
3095
3096 /*
3097  * Add or Replace ACE entry.
3098  * In some cases we need to add a specific ACE for compatibility reasons.
3099  * When doing that we must make sure we are not actually creating a duplicate
3100  * entry. So we need to search whether an ACE entry already exist and eventually
3101  * replacce the access mask, or add a completely new entry if none was found.
3102  *
3103  * This function assumes the array has enough space to add a new entry without
3104  * any reallocation of memory.
3105  */
3106
3107 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3108                                 const DOM_SID *sid, enum security_ace_type type,
3109                                 uint32_t mask, uint8_t flags)
3110 {
3111         int i;
3112
3113         /* first search for a duplicate */
3114         for (i = 0; i < *num_aces; i++) {
3115                 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3116                     (nt_ace_list[i].flags == flags)) break;
3117         }
3118
3119         if (i < *num_aces) { /* found */
3120                 nt_ace_list[i].type = type;
3121                 nt_ace_list[i].access_mask = mask;
3122                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3123                            i, sid_string_dbg(sid), flags));
3124                 return;
3125         }
3126
3127         /* not found, append it */
3128         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3129 }
3130
3131
3132 /****************************************************************************
3133  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3134  the space for the return elements and returns the size needed to return the
3135  security descriptor. This should be the only external function needed for
3136  the UNIX style get ACL.
3137 ****************************************************************************/
3138
3139 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3140                                       const char *name,
3141                                       const SMB_STRUCT_STAT *sbuf,
3142                                       struct pai_val *pal,
3143                                       SMB_ACL_T posix_acl,
3144                                       SMB_ACL_T def_acl,
3145                                       uint32_t security_info,
3146                                       SEC_DESC **ppdesc)
3147 {
3148         DOM_SID owner_sid;
3149         DOM_SID group_sid;
3150         size_t sd_size = 0;
3151         SEC_ACL *psa = NULL;
3152         size_t num_acls = 0;
3153         size_t num_def_acls = 0;
3154         size_t num_aces = 0;
3155         canon_ace *file_ace = NULL;
3156         canon_ace *dir_ace = NULL;
3157         SEC_ACE *nt_ace_list = NULL;
3158         size_t num_profile_acls = 0;
3159         DOM_SID orig_owner_sid;
3160         SEC_DESC *psd = NULL;
3161         int i;
3162
3163         /*
3164          * Get the owner, group and world SIDs.
3165          */
3166
3167         create_file_sids(sbuf, &owner_sid, &group_sid);
3168
3169         if (lp_profile_acls(SNUM(conn))) {
3170                 /* For WXP SP1 the owner must be administrators. */
3171                 sid_copy(&orig_owner_sid, &owner_sid);
3172                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3173                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3174                 num_profile_acls = 3;
3175         }
3176
3177         if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3178
3179                 /*
3180                  * In the optimum case Creator Owner and Creator Group would be used for
3181                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3182                  * would lead to usability problems under Windows: The Creator entries
3183                  * are only available in browse lists of directories and not for files;
3184                  * additionally the identity of the owning group couldn't be determined.
3185                  * We therefore use those identities only for Default ACLs.
3186                  */
3187
3188                 /* Create the canon_ace lists. */
3189                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3190                                             &owner_sid, &group_sid, pal,
3191                                             SMB_ACL_TYPE_ACCESS);
3192
3193                 /* We must have *some* ACLS. */
3194
3195                 if (count_canon_ace_list(file_ace) == 0) {
3196                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3197                         goto done;
3198                 }
3199
3200                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3201                         dir_ace = canonicalise_acl(conn, name, def_acl,
3202                                                    sbuf,
3203                                                    &global_sid_Creator_Owner,
3204                                                    &global_sid_Creator_Group,
3205                                                    pal, SMB_ACL_TYPE_DEFAULT);
3206                 }
3207
3208                 /*
3209                  * Create the NT ACE list from the canonical ace lists.
3210                  */
3211
3212                 {
3213                         canon_ace *ace;
3214                         enum security_ace_type nt_acl_type;
3215
3216                         if (nt4_compatible_acls() && dir_ace) {
3217                                 /*
3218                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3219                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3220                                  * remove entries from the Access ACL if the
3221                                  * corresponding Default ACL entries have also been
3222                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3223                                  * are exceptions. We can do nothing
3224                                  * intelligent if the Default ACL contains entries that
3225                                  * are not also contained in the Access ACL, so this
3226                                  * case will still fail under NT 4.
3227                                  */
3228
3229                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3230                                 if (ace && !ace->perms) {
3231                                         DLIST_REMOVE(dir_ace, ace);
3232                                         SAFE_FREE(ace);
3233
3234                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3235                                         if (ace && !ace->perms) {
3236                                                 DLIST_REMOVE(file_ace, ace);
3237                                                 SAFE_FREE(ace);
3238                                         }
3239                                 }
3240
3241                                 /*
3242                                  * WinNT doesn't usually have Creator Group
3243                                  * in browse lists, so we send this entry to
3244                                  * WinNT even if it contains no relevant
3245                                  * permissions. Once we can add
3246                                  * Creator Group to browse lists we can
3247                                  * re-enable this.
3248                                  */
3249
3250 #if 0
3251                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3252                                 if (ace && !ace->perms) {
3253                                         DLIST_REMOVE(dir_ace, ace);
3254                                         SAFE_FREE(ace);
3255                                 }
3256 #endif
3257
3258                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3259                                 if (ace && !ace->perms) {
3260                                         DLIST_REMOVE(file_ace, ace);
3261                                         SAFE_FREE(ace);
3262                                 }
3263                         }
3264
3265                         num_acls = count_canon_ace_list(file_ace);
3266                         num_def_acls = count_canon_ace_list(dir_ace);
3267
3268                         /* Allocate the ace list. */
3269                         if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3270                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3271                                 goto done;
3272                         }
3273
3274                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3275
3276                         /*
3277                          * Create the NT ACE list from the canonical ace lists.
3278                          */
3279
3280                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3281                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3282                                                 &nt_acl_type,
3283                                                 ace->perms,
3284                                                 S_ISDIR(sbuf->st_ex_mode));
3285                                 init_sec_ace(&nt_ace_list[num_aces++],
3286                                         &ace->trustee,
3287                                         nt_acl_type,
3288                                         acc,
3289                                         ace->ace_flags);
3290                         }
3291
3292                         /* The User must have access to a profile share - even
3293                          * if we can't map the SID. */
3294                         if (lp_profile_acls(SNUM(conn))) {
3295                                 add_or_replace_ace(nt_ace_list, &num_aces,
3296                                                    &global_sid_Builtin_Users,
3297                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3298                                                    FILE_GENERIC_ALL, 0);
3299                         }
3300
3301                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3302                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3303                                                 &nt_acl_type,
3304                                                 ace->perms,
3305                                                 S_ISDIR(sbuf->st_ex_mode));
3306                                 init_sec_ace(&nt_ace_list[num_aces++],
3307                                         &ace->trustee,
3308                                         nt_acl_type,
3309                                         acc,
3310                                         ace->ace_flags |
3311                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3312                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3313                                         SEC_ACE_FLAG_INHERIT_ONLY);
3314                         }
3315
3316                         /* The User must have access to a profile share - even
3317                          * if we can't map the SID. */
3318                         if (lp_profile_acls(SNUM(conn))) {
3319                                 add_or_replace_ace(nt_ace_list, &num_aces,
3320                                                 &global_sid_Builtin_Users,
3321                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3322                                                 FILE_GENERIC_ALL,
3323                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3324                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3325                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3326                         }
3327
3328                         /*
3329                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3330                          * Win2K needs this to get the inheritance correct when replacing ACLs
3331                          * on a directory tree. Based on work by Jim @ IBM.
3332                          */
3333
3334                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3335
3336                         if (lp_profile_acls(SNUM(conn))) {
3337                                 for (i = 0; i < num_aces; i++) {
3338                                         if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3339                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3340                                                                    &orig_owner_sid,
3341                                                                    nt_ace_list[i].type,
3342                                                                    nt_ace_list[i].access_mask,
3343                                                                    nt_ace_list[i].flags);
3344                                                 break;
3345                                         }
3346                                 }
3347                         }
3348                 }
3349
3350                 if (num_aces) {
3351                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3352                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3353                                 goto done;
3354                         }
3355                 }
3356         } /* security_info & DACL_SECURITY_INFORMATION */
3357
3358         psd = make_standard_sec_desc( talloc_tos(),
3359                         (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3360                         (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3361                         psa,
3362                         &sd_size);
3363
3364         if(!psd) {
3365                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3366                 sd_size = 0;
3367                 goto done;
3368         }
3369
3370         /*
3371          * Windows 2000: The DACL_PROTECTED flag in the security
3372          * descriptor marks the ACL as non-inheriting, i.e., no
3373          * ACEs from higher level directories propagate to this
3374          * ACL. In the POSIX ACL model permissions are only
3375          * inherited at file create time, so ACLs never contain
3376          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3377          * flag doesn't seem to bother Windows NT.
3378          * Always set this if map acl inherit is turned off.
3379          */
3380         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3381                 psd->type |= SEC_DESC_DACL_PROTECTED;
3382         } else {
3383                 psd->type |= pal->sd_type;
3384         }
3385
3386         if (psd->dacl) {
3387                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3388         }
3389
3390         *ppdesc = psd;
3391
3392  done:
3393
3394         if (posix_acl) {
3395                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3396         }
3397         if (def_acl) {
3398                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3399         }
3400         free_canon_ace_list(file_ace);
3401         free_canon_ace_list(dir_ace);
3402         free_inherited_info(pal);
3403         SAFE_FREE(nt_ace_list);
3404
3405         return NT_STATUS_OK;
3406 }
3407
3408 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3409                            SEC_DESC **ppdesc)
3410 {
3411         SMB_STRUCT_STAT sbuf;
3412         SMB_ACL_T posix_acl = NULL;
3413         struct pai_val *pal;
3414
3415         *ppdesc = NULL;
3416
3417         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3418                   fsp_str_dbg(fsp)));
3419
3420         /* can it happen that fsp_name == NULL ? */
3421         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3422                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3423                                         security_info, ppdesc);
3424         }
3425
3426         /* Get the stat struct for the owner info. */
3427         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3428                 return map_nt_error_from_unix(errno);
3429         }
3430
3431         /* Get the ACL from the fd. */
3432         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3433
3434         pal = fload_inherited_info(fsp);
3435
3436         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3437                                        &sbuf, pal, posix_acl, NULL,
3438                                        security_info, ppdesc);
3439 }
3440
3441 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3442                           uint32_t security_info, SEC_DESC **ppdesc)
3443 {
3444         SMB_ACL_T posix_acl = NULL;
3445         SMB_ACL_T def_acl = NULL;
3446         struct pai_val *pal;
3447         struct smb_filename smb_fname;
3448         int ret;
3449
3450         *ppdesc = NULL;
3451
3452         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3453
3454         ZERO_STRUCT(smb_fname);
3455         smb_fname.base_name = discard_const_p(char, name);
3456
3457         /* Get the stat struct for the owner info. */
3458         if (lp_posix_pathnames()) {
3459                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3460         } else {
3461                 ret = SMB_VFS_STAT(conn, &smb_fname);
3462         }
3463
3464         if (ret == -1) {
3465                 return map_nt_error_from_unix(errno);
3466         }
3467
3468         /* Get the ACL from the path. */
3469         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3470
3471         /* If it's a directory get the default POSIX ACL. */
3472         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3473                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3474                 def_acl = free_empty_sys_acl(conn, def_acl);
3475         }
3476
3477         pal = load_inherited_info(conn, name);
3478
3479         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3480                                        posix_acl, def_acl, security_info,
3481                                        ppdesc);
3482 }
3483
3484 /****************************************************************************
3485  Try to chown a file. We will be able to chown it under the following conditions.
3486
3487   1) If we have root privileges, then it will just work.
3488   2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3489   3) If we have SeRestorePrivilege we can change the user to any other user.
3490   4) If we have write permission to the file and dos_filemodes is set
3491      then allow chown to the currently authenticated user.
3492 ****************************************************************************/
3493
3494 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3495               uid_t uid, gid_t gid)
3496 {
3497         int ret;
3498         files_struct *fsp;
3499
3500         if(!CAN_WRITE(conn)) {
3501                 return -1;
3502         }
3503
3504         /* Case (1). */
3505         /* try the direct way first */
3506         if (lp_posix_pathnames()) {
3507                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3508         } else {
3509                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3510         }
3511
3512         if (ret == 0)
3513                 return 0;
3514
3515         /* Case (2) / (3) */
3516         if (lp_enable_privileges()) {
3517
3518                 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3519                                                               &se_take_ownership);
3520                 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3521                                                        &se_restore);
3522
3523                 /* Case (2) */
3524                 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3525                 /* Case (3) */
3526                      ( has_restore_priv ) ) {
3527
3528                         become_root();
3529                         /* Keep the current file gid the same - take ownership doesn't imply group change. */
3530                         if (lp_posix_pathnames()) {
3531                                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3532                                                     (gid_t)-1);
3533                         } else {
3534                                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3535                                                     (gid_t)-1);
3536                         }
3537                         unbecome_root();
3538                         return ret;
3539                 }
3540         }
3541
3542         /* Case (4). */
3543         if (!lp_dos_filemode(SNUM(conn))) {
3544                 errno = EPERM;
3545                 return -1;
3546         }
3547
3548         /* only allow chown to the current user. This is more secure,
3549            and also copes with the case where the SID in a take ownership ACL is
3550            a local SID on the users workstation
3551         */
3552         if (uid != current_user.ut.uid) {
3553                 errno = EPERM;
3554                 return -1;
3555         }
3556
3557         if (lp_posix_pathnames()) {
3558                 ret = SMB_VFS_LSTAT(conn, smb_fname);
3559         } else {
3560                 ret = SMB_VFS_STAT(conn, smb_fname);
3561         }
3562
3563         if (ret == -1) {
3564                 return -1;
3565         }
3566
3567         if (!NT_STATUS_IS_OK(open_file_fchmod(conn, smb_fname, &fsp))) {
3568                 return -1;
3569         }
3570
3571         become_root();
3572         /* Keep the current file gid the same. */
3573         if (fsp->fh->fd == -1) {
3574                 if (lp_posix_pathnames()) {
3575                         ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3576                                             (gid_t)-1);
3577                 } else {
3578                         ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3579                                             (gid_t)-1);
3580                 }
3581         } else {
3582                 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3583         }
3584         unbecome_root();
3585
3586         close_file(NULL, fsp, NORMAL_CLOSE);
3587
3588         return ret;
3589 }
3590
3591 #if 0
3592 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3593
3594 /****************************************************************************
3595  Take care of parent ACL inheritance.
3596 ****************************************************************************/
3597
3598 NTSTATUS append_parent_acl(files_struct *fsp,
3599                                 const SEC_DESC *pcsd,
3600                                 SEC_DESC **pp_new_sd)
3601 {
3602         struct smb_filename *smb_dname = NULL;
3603         SEC_DESC *parent_sd = NULL;
3604         files_struct *parent_fsp = NULL;
3605         TALLOC_CTX *mem_ctx = talloc_tos();
3606         char *parent_name = NULL;
3607         SEC_ACE *new_ace = NULL;
3608         unsigned int num_aces = pcsd->dacl->num_aces;
3609         NTSTATUS status;
3610         int info;
3611         unsigned int i, j;
3612         SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3613         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3614
3615         if (psd == NULL) {
3616                 return NT_STATUS_NO_MEMORY;
3617         }
3618
3619         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3620                             NULL)) {
3621                 return NT_STATUS_NO_MEMORY;
3622         }
3623
3624         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3625                                             &smb_dname);
3626         if (!NT_STATUS_IS_OK(status)) {
3627                 goto fail;
3628         }
3629
3630         status = SMB_VFS_CREATE_FILE(
3631                 fsp->conn,                              /* conn */
3632                 NULL,                                   /* req */
3633                 0,                                      /* root_dir_fid */
3634                 smb_dname,                              /* fname */
3635                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3636                 FILE_SHARE_NONE,                        /* share_access */
3637                 FILE_OPEN,                              /* create_disposition*/
3638                 FILE_DIRECTORY_FILE,                    /* create_options */
3639                 0,                                      /* file_attributes */
3640                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3641                 0,                                      /* allocation_size */
3642                 NULL,                                   /* sd */
3643                 NULL,                                   /* ea_list */
3644                 &parent_fsp,                            /* result */
3645                 &info);                                 /* pinfo */
3646
3647         if (!NT_STATUS_IS_OK(status)) {
3648                 TALLOC_FREE(smb_dname);
3649                 return status;
3650         }
3651
3652         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3653                                     DACL_SECURITY_INFORMATION, &parent_sd );
3654
3655         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3656         TALLOC_FREE(smb_dname);
3657
3658         if (!NT_STATUS_IS_OK(status)) {
3659                 return status;
3660         }
3661
3662         /*
3663          * Make room for potentially all the ACLs from
3664          * the parent. We used to add the ugw triple here,
3665          * as we knew we were dealing with POSIX ACLs.
3666          * We no longer need to do so as we can guarentee
3667          * that a default ACL from the parent directory will
3668          * be well formed for POSIX ACLs if it came from a
3669          * POSIX ACL source, and if we're not writing to a
3670          * POSIX ACL sink then we don't care if it's not well
3671          * formed. JRA.
3672          */
3673
3674         num_aces += parent_sd->dacl->num_aces;
3675
3676         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3677                                         num_aces)) == NULL) {
3678                 return NT_STATUS_NO_MEMORY;
3679         }
3680
3681         /* Start by copying in all the given ACE entries. */
3682         for (i = 0; i < psd->dacl->num_aces; i++) {
3683                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3684         }
3685
3686         /*
3687          * Note that we're ignoring "inherit permissions" here
3688          * as that really only applies to newly created files. JRA.
3689          */
3690
3691         /* Finally append any inherited ACEs. */
3692         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3693                 SEC_ACE *se = &parent_sd->dacl->aces[j];
3694
3695                 if (fsp->is_directory) {
3696                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3697                                 /* Doesn't apply to a directory - ignore. */
3698                                 DEBUG(10,("append_parent_acl: directory %s "
3699                                         "ignoring non container "
3700                                         "inherit flags %u on ACE with sid %s "
3701                                         "from parent %s\n",
3702                                         fsp_str_dbg(fsp),
3703                                         (unsigned int)se->flags,
3704                                         sid_string_dbg(&se->trustee),
3705                                         parent_name));
3706                                 continue;
3707                         }
3708                 } else {
3709                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3710                                 /* Doesn't apply to a file - ignore. */
3711                                 DEBUG(10,("append_parent_acl: file %s "
3712                                         "ignoring non object "
3713                                         "inherit flags %u on ACE with sid %s "
3714                                         "from parent %s\n",
3715                                         fsp_str_dbg(fsp),
3716                                         (unsigned int)se->flags,
3717                                         sid_string_dbg(&se->trustee),
3718                                         parent_name));
3719                                 continue;
3720                         }
3721                 }
3722
3723                 if (is_dacl_protected) {
3724                         /* If the DACL is protected it means we must
3725                          * not overwrite an existing ACE entry with the
3726                          * same SID. This is order N^2. Ouch :-(. JRA. */
3727                         unsigned int k;
3728                         for (k = 0; k < psd->dacl->num_aces; k++) {
3729                                 if (sid_equal(&psd->dacl->aces[k].trustee,
3730                                                 &se->trustee)) {
3731                                         break;
3732                                 }
3733                         }
3734                         if (k < psd->dacl->num_aces) {
3735                                 /* SID matched. Ignore. */
3736                                 DEBUG(10,("append_parent_acl: path %s "
3737                                         "ignoring ACE with protected sid %s "
3738                                         "from parent %s\n",
3739                                         fsp_str_dbg(fsp),
3740                                         sid_string_dbg(&se->trustee),
3741                                         parent_name));
3742                                 continue;
3743                         }
3744                 }
3745
3746                 sec_ace_copy(&new_ace[i], se);
3747                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3748                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3749                 }
3750                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3751
3752                 if (fsp->is_directory) {
3753                         /*
3754                          * Strip off any inherit only. It's applied.
3755                          */
3756                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3757                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3758                                 /* No further inheritance. */
3759                                 new_ace[i].flags &=
3760                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3761                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3762                         }
3763                 } else {
3764                         /*
3765                          * Strip off any container or inherit
3766                          * flags, they can't apply to objects.
3767                          */
3768                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3769                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3770                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3771                 }
3772                 i++;
3773
3774                 DEBUG(10,("append_parent_acl: path %s "
3775                         "inheriting ACE with sid %s "
3776                         "from parent %s\n",
3777                         fsp_str_dbg(fsp),
3778                         sid_string_dbg(&se->trustee),
3779                         parent_name));
3780         }
3781
3782         psd->dacl->aces = new_ace;
3783         psd->dacl->num_aces = i;
3784         psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3785                          SE_DESC_DACL_AUTO_INHERIT_REQ);
3786
3787         *pp_new_sd = psd;
3788         return status;
3789 }
3790 #endif
3791
3792 /****************************************************************************
3793  Reply to set a security descriptor on an fsp. security_info_sent is the
3794  description of the following NT ACL.
3795  This should be the only external function needed for the UNIX style set ACL.
3796 ****************************************************************************/
3797
3798 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd_orig)
3799 {
3800         connection_struct *conn = fsp->conn;
3801         uid_t user = (uid_t)-1;
3802         gid_t grp = (gid_t)-1;
3803         DOM_SID file_owner_sid;
3804         DOM_SID file_grp_sid;
3805         canon_ace *file_ace_list = NULL;
3806         canon_ace *dir_ace_list = NULL;
3807         bool acl_perms = False;
3808         mode_t orig_mode = (mode_t)0;
3809         NTSTATUS status;
3810         bool set_acl_as_root = false;
3811         bool acl_set_support = false;
3812         bool ret = false;
3813         SEC_DESC *psd = NULL;
3814
3815         DEBUG(10,("set_nt_acl: called for file %s\n",
3816                   fsp_str_dbg(fsp)));
3817
3818         if (!CAN_WRITE(conn)) {
3819                 DEBUG(10,("set acl rejected on read-only share\n"));
3820                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3821         }
3822
3823         if (!psd_orig) {
3824                 return NT_STATUS_INVALID_PARAMETER;
3825         }
3826
3827         psd = dup_sec_desc(talloc_tos(), psd_orig);
3828         if (!psd) {
3829                 return NT_STATUS_NO_MEMORY;
3830         }
3831
3832         /*
3833          * Get the current state of the file.
3834          */
3835
3836         status = vfs_stat_fsp(fsp);
3837         if (!NT_STATUS_IS_OK(status)) {
3838                 return status;
3839         }
3840
3841         /* Save the original element we check against. */
3842         orig_mode = fsp->fsp_name->st.st_ex_mode;
3843
3844         /*
3845          * Unpack the user/group/world id's.
3846          */
3847
3848         /* POSIX can't cope with missing owner/group. */
3849         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3850                 security_info_sent &= ~SECINFO_OWNER;
3851         }
3852         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3853                 security_info_sent &= ~SECINFO_GROUP;
3854         }
3855
3856         status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3857         if (!NT_STATUS_IS_OK(status)) {
3858                 return status;
3859         }
3860
3861         /*
3862          * Do we need to chown ? If so this must be done first as the incoming
3863          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3864          * Noticed by Simo.
3865          */
3866
3867         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3868             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3869
3870                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3871                          fsp_str_dbg(fsp), (unsigned int)user,
3872                          (unsigned int)grp));
3873
3874                 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3875                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3876                                  "= %s.\n", fsp_str_dbg(fsp),
3877                                  (unsigned int)user, (unsigned int)grp,
3878                                  strerror(errno)));
3879                         if (errno == EPERM) {
3880                                 return NT_STATUS_INVALID_OWNER;
3881                         }
3882                         return map_nt_error_from_unix(errno);
3883                 }
3884
3885                 /*
3886                  * Recheck the current state of the file, which may have changed.
3887                  * (suid/sgid bits, for instance)
3888                  */
3889
3890                 status = vfs_stat_fsp(fsp);
3891                 if (!NT_STATUS_IS_OK(status)) {
3892                         return status;
3893                 }
3894
3895                 /* Save the original element we check against. */
3896                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3897
3898                 /* If we successfully chowned, we know we must
3899                  * be able to set the acl, so do it as root.
3900                  */
3901                 set_acl_as_root = true;
3902         }
3903
3904         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3905
3906         if((security_info_sent & SECINFO_DACL) &&
3907                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3908                         (psd->dacl == NULL)) {
3909                 SEC_ACE ace[3];
3910
3911                 /* We can't have NULL DACL in POSIX.
3912                    Use owner/group/Everyone -> full access. */
3913
3914                 init_sec_ace(&ace[0],
3915                                 &file_owner_sid,
3916                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3917                                 GENERIC_ALL_ACCESS,
3918                                 0);
3919                 init_sec_ace(&ace[1],
3920                                 &file_grp_sid,
3921                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3922                                 GENERIC_ALL_ACCESS,
3923                                 0);
3924                 init_sec_ace(&ace[2],
3925                                 &global_sid_World,
3926                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3927                                 GENERIC_ALL_ACCESS,
3928                                 0);
3929                 psd->dacl = make_sec_acl(talloc_tos(),
3930                                         NT4_ACL_REVISION,
3931                                         3,
3932                                         ace);
3933                 if (psd->dacl == NULL) {
3934                         return NT_STATUS_NO_MEMORY;
3935                 }
3936                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3937         }
3938
3939         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3940                                      &file_grp_sid, &file_ace_list,
3941                                      &dir_ace_list, security_info_sent, psd);
3942
3943         /* Ignore W2K traverse DACL set. */
3944         if (!file_ace_list && !dir_ace_list) {
3945                 return NT_STATUS_OK;
3946         }
3947
3948         if (!acl_perms) {
3949                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3950                 free_canon_ace_list(file_ace_list);
3951                 free_canon_ace_list(dir_ace_list);
3952                 return NT_STATUS_ACCESS_DENIED;
3953         }
3954
3955         /*
3956          * Only change security if we got a DACL.
3957          */
3958
3959         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3960                 free_canon_ace_list(file_ace_list);
3961                 free_canon_ace_list(dir_ace_list);
3962                 return NT_STATUS_OK;
3963         }
3964
3965         /*
3966          * Try using the POSIX ACL set first. Fall back to chmod if
3967          * we have no ACL support on this filesystem.
3968          */
3969
3970         if (acl_perms && file_ace_list) {
3971                 if (set_acl_as_root) {
3972                         become_root();
3973                 }
3974                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3975                                          &fsp->fsp_name->st, &acl_set_support);
3976                 if (set_acl_as_root) {
3977                         unbecome_root();
3978                 }
3979                 if (acl_set_support && ret == false) {
3980                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3981                                  "%s (%s).\n", fsp_str_dbg(fsp),
3982                                  strerror(errno)));
3983                         free_canon_ace_list(file_ace_list);
3984                         free_canon_ace_list(dir_ace_list);
3985                         return map_nt_error_from_unix(errno);
3986                 }
3987         }
3988
3989         if (acl_perms && acl_set_support && fsp->is_directory) {
3990                 if (dir_ace_list) {
3991                         if (set_acl_as_root) {
3992                                 become_root();
3993                         }
3994                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
3995                                                  &fsp->fsp_name->st,
3996                                                  &acl_set_support);
3997                         if (set_acl_as_root) {
3998                                 unbecome_root();
3999                         }
4000                         if (ret == false) {
4001                                 DEBUG(3,("set_nt_acl: failed to set default "
4002                                          "acl on directory %s (%s).\n",
4003                                          fsp_str_dbg(fsp), 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                 } else {
4009                         int sret = -1;
4010
4011                         /*
4012                          * No default ACL - delete one if it exists.
4013                          */
4014
4015                         if (set_acl_as_root) {
4016                                 become_root();
4017                         }
4018                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4019                             fsp->fsp_name->base_name);
4020                         if (set_acl_as_root) {
4021                                 unbecome_root();
4022                         }
4023                         if (sret == -1) {
4024                                 if (acl_group_override(conn, fsp->fsp_name)) {
4025                                         DEBUG(5,("set_nt_acl: acl group "
4026                                                  "control on and current user "
4027                                                  "in file %s primary group. "
4028                                                  "Override delete_def_acl\n",
4029                                                  fsp_str_dbg(fsp)));
4030
4031                                         become_root();
4032                                         sret =
4033                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4034                                                     conn,
4035                                                     fsp->fsp_name->base_name);
4036                                         unbecome_root();
4037                                 }
4038
4039                                 if (sret == -1) {
4040                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4041                                         free_canon_ace_list(file_ace_list);
4042                                         free_canon_ace_list(dir_ace_list);
4043                                         return map_nt_error_from_unix(errno);
4044                                 }
4045                         }
4046                 }
4047         }
4048
4049         if (acl_set_support) {
4050                 if (set_acl_as_root) {
4051                         become_root();
4052                 }
4053                 store_inheritance_attributes(fsp,
4054                                 file_ace_list,
4055                                 dir_ace_list,
4056                                 psd->type);
4057                 if (set_acl_as_root) {
4058                         unbecome_root();
4059                 }
4060         }
4061
4062         /*
4063          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4064          */
4065
4066         if(!acl_set_support && acl_perms) {
4067                 mode_t posix_perms;
4068
4069                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4070                         free_canon_ace_list(file_ace_list);
4071                         free_canon_ace_list(dir_ace_list);
4072                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4073                                  "posix permissions for file %s.\n",
4074                                  fsp_str_dbg(fsp)));
4075                         return NT_STATUS_ACCESS_DENIED;
4076                 }
4077
4078                 if (orig_mode != posix_perms) {
4079                         int sret = -1;
4080
4081                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4082                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4083
4084                         if (set_acl_as_root) {
4085                                 become_root();
4086                         }
4087                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4088                                              posix_perms);
4089                         if (set_acl_as_root) {
4090                                 unbecome_root();
4091                         }
4092                         if(sret == -1) {
4093                                 if (acl_group_override(conn, fsp->fsp_name)) {
4094                                         DEBUG(5,("set_nt_acl: acl group "
4095                                                  "control on and current user "
4096                                                  "in file %s primary group. "
4097                                                  "Override chmod\n",
4098                                                  fsp_str_dbg(fsp)));
4099
4100                                         become_root();
4101                                         sret = SMB_VFS_CHMOD(conn,
4102                                             fsp->fsp_name->base_name,
4103                                             posix_perms);
4104                                         unbecome_root();
4105                                 }
4106
4107                                 if (sret == -1) {
4108                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4109                                                  "failed. Error = %s.\n",
4110                                                  fsp_str_dbg(fsp),
4111                                                  (unsigned int)posix_perms,
4112                                                  strerror(errno)));
4113                                         free_canon_ace_list(file_ace_list);
4114                                         free_canon_ace_list(dir_ace_list);
4115                                         return map_nt_error_from_unix(errno);
4116                                 }
4117                         }
4118                 }
4119         }
4120
4121         free_canon_ace_list(file_ace_list);
4122         free_canon_ace_list(dir_ace_list);
4123
4124         /* Ensure the stat struct in the fsp is correct. */
4125         status = vfs_stat_fsp(fsp);
4126
4127         return NT_STATUS_OK;
4128 }
4129
4130 /****************************************************************************
4131  Get the actual group bits stored on a file with an ACL. Has no effect if
4132  the file has no ACL. Needed in dosmode code where the stat() will return
4133  the mask bits, not the real group bits, for a file with an ACL.
4134 ****************************************************************************/
4135
4136 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4137 {
4138         int entry_id = SMB_ACL_FIRST_ENTRY;
4139         SMB_ACL_ENTRY_T entry;
4140         SMB_ACL_T posix_acl;
4141         int result = -1;
4142
4143         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4144         if (posix_acl == (SMB_ACL_T)NULL)
4145                 return -1;
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
4151                 entry_id = SMB_ACL_NEXT_ENTRY;
4152
4153                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4154                         break;
4155
4156                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4157                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4158                                 break;
4159                         } else {
4160                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4161                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4162                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4163                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4164                                 result = 0;
4165                                 break;
4166                         }
4167                 }
4168         }
4169         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4170         return result;
4171 }
4172
4173 /****************************************************************************
4174  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4175  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4176 ****************************************************************************/
4177
4178 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4179 {
4180         int entry_id = SMB_ACL_FIRST_ENTRY;
4181         SMB_ACL_ENTRY_T entry;
4182         int num_entries = 0;
4183
4184         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4185                 SMB_ACL_TAG_T tagtype;
4186                 SMB_ACL_PERMSET_T permset;
4187                 mode_t perms;
4188
4189                 entry_id = SMB_ACL_NEXT_ENTRY;
4190
4191                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4192                         return -1;
4193
4194                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4195                         return -1;
4196
4197                 num_entries++;
4198
4199                 switch(tagtype) {
4200                         case SMB_ACL_USER_OBJ:
4201                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4202                                 break;
4203                         case SMB_ACL_GROUP_OBJ:
4204                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4205                                 break;
4206                         case SMB_ACL_MASK:
4207                                 /*
4208                                  * FIXME: The ACL_MASK entry permissions should really be set to
4209                                  * the union of the permissions of all ACL_USER,
4210                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4211                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4212                                  */
4213                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4214                                 break;
4215                         case SMB_ACL_OTHER:
4216                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4217                                 break;
4218                         default:
4219                                 continue;
4220                 }
4221
4222                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4223                         return -1;
4224
4225                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4226                         return -1;
4227         }
4228
4229         /*
4230          * If this is a simple 3 element ACL or no elements then it's a standard
4231          * UNIX permission set. Just use chmod...
4232          */
4233
4234         if ((num_entries == 3) || (num_entries == 0))
4235                 return -1;
4236
4237         return 0;
4238 }
4239
4240 /****************************************************************************
4241  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4242  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4243  resulting ACL on TO.  Note that name is in UNIX character set.
4244 ****************************************************************************/
4245
4246 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4247 {
4248         SMB_ACL_T posix_acl = NULL;
4249         int ret = -1;
4250
4251         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4252                 return -1;
4253
4254         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4255                 goto done;
4256
4257         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4258
4259  done:
4260
4261         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4262         return ret;
4263 }
4264
4265 /****************************************************************************
4266  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4267  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4268  Note that name is in UNIX character set.
4269 ****************************************************************************/
4270
4271 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4272 {
4273         return copy_access_posix_acl(conn, name, name, mode);
4274 }
4275
4276 /****************************************************************************
4277  Check for an existing default POSIX ACL on a directory.
4278 ****************************************************************************/
4279
4280 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4281 {
4282         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4283         bool has_acl = False;
4284         SMB_ACL_ENTRY_T entry;
4285
4286         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4287                 has_acl = True;
4288         }
4289
4290         if (def_acl) {
4291                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4292         }
4293         return has_acl;
4294 }
4295
4296 /****************************************************************************
4297  If the parent directory has no default ACL but it does have an Access ACL,
4298  inherit this Access ACL to file name.
4299 ****************************************************************************/
4300
4301 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4302                        const char *name, mode_t mode)
4303 {
4304         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4305                 return 0;
4306
4307         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4308 }
4309
4310 /****************************************************************************
4311  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4312  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4313 ****************************************************************************/
4314
4315 int fchmod_acl(files_struct *fsp, mode_t mode)
4316 {
4317         connection_struct *conn = fsp->conn;
4318         SMB_ACL_T posix_acl = NULL;
4319         int ret = -1;
4320
4321         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4322                 return -1;
4323
4324         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4325                 goto done;
4326
4327         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4328
4329   done:
4330
4331         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4332         return ret;
4333 }
4334
4335 /****************************************************************************
4336  Map from wire type to permset.
4337 ****************************************************************************/
4338
4339 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4340 {
4341         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4342                 return False;
4343         }
4344
4345         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4346                 return False;
4347         }
4348
4349         if (wire_perm & SMB_POSIX_ACL_READ) {
4350                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4351                         return False;
4352                 }
4353         }
4354         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4355                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4356                         return False;
4357                 }
4358         }
4359         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4360                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4361                         return False;
4362                 }
4363         }
4364         return True;
4365 }
4366
4367 /****************************************************************************
4368  Map from wire type to tagtype.
4369 ****************************************************************************/
4370
4371 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4372 {
4373         switch (wire_tt) {
4374                 case SMB_POSIX_ACL_USER_OBJ:
4375                         *p_tt = SMB_ACL_USER_OBJ;
4376                         break;
4377                 case SMB_POSIX_ACL_USER:
4378                         *p_tt = SMB_ACL_USER;
4379                         break;
4380                 case SMB_POSIX_ACL_GROUP_OBJ:
4381                         *p_tt = SMB_ACL_GROUP_OBJ;
4382                         break;
4383                 case SMB_POSIX_ACL_GROUP:
4384                         *p_tt = SMB_ACL_GROUP;
4385                         break;
4386                 case SMB_POSIX_ACL_MASK:
4387                         *p_tt = SMB_ACL_MASK;
4388                         break;
4389                 case SMB_POSIX_ACL_OTHER:
4390                         *p_tt = SMB_ACL_OTHER;
4391                         break;
4392                 default:
4393                         return False;
4394         }
4395         return True;
4396 }
4397
4398 /****************************************************************************
4399  Create a new POSIX acl from wire permissions.
4400  FIXME ! How does the share mask/mode fit into this.... ?
4401 ****************************************************************************/
4402
4403 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4404 {
4405         unsigned int i;
4406         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4407
4408         if (the_acl == NULL) {
4409                 return NULL;
4410         }
4411
4412         for (i = 0; i < num_acls; i++) {
4413                 SMB_ACL_ENTRY_T the_entry;
4414                 SMB_ACL_PERMSET_T the_permset;
4415                 SMB_ACL_TAG_T tag_type;
4416
4417                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4418                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4419                                 i, strerror(errno) ));
4420                         goto fail;
4421                 }
4422
4423                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4424                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4425                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4426                         goto fail;
4427                 }
4428
4429                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4430                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4431                                 i, strerror(errno) ));
4432                         goto fail;
4433                 }
4434
4435                 /* Get the permset pointer from the new ACL entry. */
4436                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4437                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4438                                 i, strerror(errno) ));
4439                         goto fail;
4440                 }
4441
4442                 /* Map from wire to permissions. */
4443                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4444                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4445                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4446                         goto fail;
4447                 }
4448
4449                 /* Now apply to the new ACL entry. */
4450                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4451                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4452                                 i, strerror(errno) ));
4453                         goto fail;
4454                 }
4455
4456                 if (tag_type == SMB_ACL_USER) {
4457                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4458                         uid_t uid = (uid_t)uidval;
4459                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4460                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4461                                         (unsigned int)uid, i, strerror(errno) ));
4462                                 goto fail;
4463                         }
4464                 }
4465
4466                 if (tag_type == SMB_ACL_GROUP) {
4467                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4468                         gid_t gid = (uid_t)gidval;
4469                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4470                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4471                                         (unsigned int)gid, i, strerror(errno) ));
4472                                 goto fail;
4473                         }
4474                 }
4475         }
4476
4477         return the_acl;
4478
4479  fail:
4480
4481         if (the_acl != NULL) {
4482                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4483         }
4484         return NULL;
4485 }
4486
4487 /****************************************************************************
4488  Calls from UNIX extensions - Default POSIX ACL set.
4489  If num_def_acls == 0 and not a directory just return. If it is a directory
4490  and num_def_acls == 0 then remove the default acl. Else set the default acl
4491  on the directory.
4492 ****************************************************************************/
4493
4494 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4495                                 uint16 num_def_acls, const char *pdata)
4496 {
4497         SMB_ACL_T def_acl = NULL;
4498
4499         if (!S_ISDIR(psbuf->st_ex_mode)) {
4500                 if (num_def_acls) {
4501                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4502                         errno = EISDIR;
4503                         return False;
4504                 } else {
4505                         return True;
4506                 }
4507         }
4508
4509         if (!num_def_acls) {
4510                 /* Remove the default ACL. */
4511                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4512                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4513                                 fname, strerror(errno) ));
4514                         return False;
4515                 }
4516                 return True;
4517         }
4518
4519         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4520                 return False;
4521         }
4522
4523         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4524                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4525                         fname, strerror(errno) ));
4526                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4527                 return False;
4528         }
4529
4530         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4531         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4532         return True;
4533 }
4534
4535 /****************************************************************************
4536  Remove an ACL from a file. As we don't have acl_delete_entry() available
4537  we must read the current acl and copy all entries except MASK, USER and GROUP
4538  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4539  removed.
4540  FIXME ! How does the share mask/mode fit into this.... ?
4541 ****************************************************************************/
4542
4543 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4544 {
4545         SMB_ACL_T file_acl = NULL;
4546         int entry_id = SMB_ACL_FIRST_ENTRY;
4547         SMB_ACL_ENTRY_T entry;
4548         bool ret = False;
4549         /* Create a new ACL with only 3 entries, u/g/w. */
4550         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4551         SMB_ACL_ENTRY_T user_ent = NULL;
4552         SMB_ACL_ENTRY_T group_ent = NULL;
4553         SMB_ACL_ENTRY_T other_ent = NULL;
4554
4555         if (new_file_acl == NULL) {
4556                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4557                 return False;
4558         }
4559
4560         /* Now create the u/g/w entries. */
4561         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4562                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4563                         fname, strerror(errno) ));
4564                 goto done;
4565         }
4566         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4567                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4568                         fname, strerror(errno) ));
4569                 goto done;
4570         }
4571
4572         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4573                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4574                         fname, strerror(errno) ));
4575                 goto done;
4576         }
4577         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4578                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4579                         fname, strerror(errno) ));
4580                 goto done;
4581         }
4582
4583         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4584                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4585                         fname, strerror(errno) ));
4586                 goto done;
4587         }
4588         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4589                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4590                         fname, strerror(errno) ));
4591                 goto done;
4592         }
4593
4594         /* Get the current file ACL. */
4595         if (fsp && fsp->fh->fd != -1) {
4596                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4597         } else {
4598                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4599         }
4600
4601         if (file_acl == NULL) {
4602                 /* This is only returned if an error occurred. Even for a file with
4603                    no acl a u/g/w acl should be returned. */
4604                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4605                         fname, strerror(errno) ));
4606                 goto done;
4607         }
4608
4609         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4610                 SMB_ACL_TAG_T tagtype;
4611                 SMB_ACL_PERMSET_T permset;
4612
4613                 entry_id = SMB_ACL_NEXT_ENTRY;
4614
4615                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4616                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4617                                 fname, strerror(errno) ));
4618                         goto done;
4619                 }
4620
4621                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4622                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4623                                 fname, strerror(errno) ));
4624                         goto done;
4625                 }
4626
4627                 if (tagtype == SMB_ACL_USER_OBJ) {
4628                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4629                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4630                                         fname, strerror(errno) ));
4631                         }
4632                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4633                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4634                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4635                                         fname, strerror(errno) ));
4636                         }
4637                 } else if (tagtype == SMB_ACL_OTHER) {
4638                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4639                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4640                                         fname, strerror(errno) ));
4641                         }
4642                 }
4643         }
4644
4645         /* Set the new empty file ACL. */
4646         if (fsp && fsp->fh->fd != -1) {
4647                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4648                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4649                                 fname, strerror(errno) ));
4650                         goto done;
4651                 }
4652         } else {
4653                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4654                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4655                                 fname, strerror(errno) ));
4656                         goto done;
4657                 }
4658         }
4659
4660         ret = True;
4661
4662  done:
4663
4664         if (file_acl) {
4665                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4666         }
4667         if (new_file_acl) {
4668                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4669         }
4670         return ret;
4671 }
4672
4673 /****************************************************************************
4674  Calls from UNIX extensions - POSIX ACL set.
4675  If num_def_acls == 0 then read/modify/write acl after removing all entries
4676  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4677 ****************************************************************************/
4678
4679 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4680 {
4681         SMB_ACL_T file_acl = NULL;
4682
4683         if (!num_acls) {
4684                 /* Remove the ACL from the file. */
4685                 return remove_posix_acl(conn, fsp, fname);
4686         }
4687
4688         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4689                 return False;
4690         }
4691
4692         if (fsp && fsp->fh->fd != -1) {
4693                 /* The preferred way - use an open fd. */
4694                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4695                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4696                                 fname, strerror(errno) ));
4697                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4698                         return False;
4699                 }
4700         } else {
4701                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4702                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4703                                 fname, strerror(errno) ));
4704                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4705                         return False;
4706                 }
4707         }
4708
4709         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4710         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4711         return True;
4712 }
4713
4714 /********************************************************************
4715  Pull the NT ACL from a file on disk or the OpenEventlog() access
4716  check.  Caller is responsible for freeing the returned security
4717  descriptor via TALLOC_FREE().  This is designed for dealing with
4718  user space access checks in smbd outside of the VFS.  For example,
4719  checking access rights in OpenEventlog().
4720
4721  Assume we are dealing with files (for now)
4722 ********************************************************************/
4723
4724 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4725 {
4726         SEC_DESC *psd, *ret_sd;
4727         connection_struct *conn;
4728         files_struct finfo;
4729         struct fd_handle fh;
4730         NTSTATUS status;
4731
4732         conn = TALLOC_ZERO_P(ctx, connection_struct);
4733         if (conn == NULL) {
4734                 DEBUG(0, ("talloc failed\n"));
4735                 return NULL;
4736         }
4737
4738         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4739                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4740                 TALLOC_FREE(conn);
4741                 return NULL;
4742         }
4743
4744         conn->params->service = -1;
4745
4746         set_conn_connectpath(conn, "/");
4747
4748         if (!smbd_vfs_init(conn)) {
4749                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4750                 conn_free(conn);
4751                 return NULL;
4752         }
4753
4754         ZERO_STRUCT( finfo );
4755         ZERO_STRUCT( fh );
4756
4757         finfo.fnum = -1;
4758         finfo.conn = conn;
4759         finfo.fh = &fh;
4760         finfo.fh->fd = -1;
4761
4762         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4763                                             &finfo.fsp_name);
4764         if (!NT_STATUS_IS_OK(status)) {
4765                 conn_free(conn);
4766                 return NULL;
4767         }
4768
4769         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4770                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4771                 TALLOC_FREE(finfo.fsp_name);
4772                 conn_free(conn);
4773                 return NULL;
4774         }
4775
4776         ret_sd = dup_sec_desc( ctx, psd );
4777
4778         TALLOC_FREE(finfo.fsp_name);
4779         conn_free(conn);
4780
4781         return ret_sd;
4782 }
4783
4784 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4785
4786 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4787                                         const char *name,
4788                                         SMB_STRUCT_STAT *psbuf,
4789                                         SEC_DESC **ppdesc)
4790 {
4791         struct dom_sid owner_sid, group_sid;
4792         size_t size = 0;
4793         SEC_ACE aces[4];
4794         uint32_t access_mask = 0;
4795         mode_t mode = psbuf->st_ex_mode;
4796         SEC_ACL *new_dacl = NULL;
4797         int idx = 0;
4798
4799         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4800                 name, (int)mode ));
4801
4802         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4803         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4804
4805         /*
4806          We provide up to 4 ACEs
4807                 - Owner
4808                 - Group
4809                 - Everyone
4810                 - NT System
4811         */
4812
4813         if (mode & S_IRUSR) {
4814                 if (mode & S_IWUSR) {
4815                         access_mask |= SEC_RIGHTS_FILE_ALL;
4816                 } else {
4817                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4818                 }
4819         }
4820         if (mode & S_IWUSR) {
4821                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4822         }
4823
4824         init_sec_ace(&aces[idx],
4825                         &owner_sid,
4826                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4827                         access_mask,
4828                         0);
4829         idx++;
4830
4831         access_mask = 0;
4832         if (mode & S_IRGRP) {
4833                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4834         }
4835         if (mode & S_IWGRP) {
4836                 /* note that delete is not granted - this matches posix behaviour */
4837                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4838         }
4839         if (access_mask) {
4840                 init_sec_ace(&aces[idx],
4841                         &group_sid,
4842                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4843                         access_mask,
4844                         0);
4845                 idx++;
4846         }
4847
4848         access_mask = 0;
4849         if (mode & S_IROTH) {
4850                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4851         }
4852         if (mode & S_IWOTH) {
4853                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4854         }
4855         if (access_mask) {
4856                 init_sec_ace(&aces[idx],
4857                         &global_sid_World,
4858                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4859                         access_mask,
4860                         0);
4861                 idx++;
4862         }
4863
4864         init_sec_ace(&aces[idx],
4865                         &global_sid_System,
4866                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4867                         SEC_RIGHTS_FILE_ALL,
4868                         0);
4869         idx++;
4870
4871         new_dacl = make_sec_acl(ctx,
4872                         NT4_ACL_REVISION,
4873                         idx,
4874                         aces);
4875
4876         if (!new_dacl) {
4877                 return NT_STATUS_NO_MEMORY;
4878         }
4879
4880         *ppdesc = make_sec_desc(ctx,
4881                         SECURITY_DESCRIPTOR_REVISION_1,
4882                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4883                         &owner_sid,
4884                         &group_sid,
4885                         NULL,
4886                         new_dacl,
4887                         &size);
4888         if (!*ppdesc) {
4889                 return NT_STATUS_NO_MEMORY;
4890         }
4891         return NT_STATUS_OK;
4892 }