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)
1127 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
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                                 bool is_default_acl,
1346                                 const struct share_params *params,
1347                                 const bool is_directory,
1348                                 const DOM_SID *pfile_owner_sid,
1349                                 const DOM_SID *pfile_grp_sid,
1350                                 const SMB_STRUCT_STAT *pst,
1351                                 bool setting_acl)
1352 {
1353         canon_ace *pace;
1354         bool got_user = False;
1355         bool got_grp = False;
1356         bool got_other = False;
1357         canon_ace *pace_other = NULL;
1358
1359         for (pace = *pp_ace; pace; pace = pace->next) {
1360                 if (pace->type == SMB_ACL_USER_OBJ) {
1361
1362                         if (setting_acl && !is_default_acl) {
1363                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1364                         }
1365                         got_user = True;
1366
1367                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1368
1369                         /*
1370                          * Ensure create mask/force create mode is respected on set.
1371                          */
1372
1373                         if (setting_acl && !is_default_acl) {
1374                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1375                         }
1376                         got_grp = True;
1377
1378                 } else if (pace->type == SMB_ACL_OTHER) {
1379
1380                         /*
1381                          * Ensure create mask/force create mode is respected on set.
1382                          */
1383
1384                         if (setting_acl && !is_default_acl) {
1385                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1386                         }
1387                         got_other = True;
1388                         pace_other = pace;
1389                 }
1390         }
1391
1392         if (!got_user) {
1393                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1394                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1395                         return False;
1396                 }
1397
1398                 ZERO_STRUCTP(pace);
1399                 pace->type = SMB_ACL_USER_OBJ;
1400                 pace->owner_type = UID_ACE;
1401                 pace->unix_ug.uid = pst->st_ex_uid;
1402                 pace->trustee = *pfile_owner_sid;
1403                 pace->attr = ALLOW_ACE;
1404                 /* Start with existing permissions, principle of least
1405                    surprises for the user. */
1406                 pace->perms = pst->st_ex_mode;
1407
1408                 if (setting_acl) {
1409                         /* See if the owning user is in any of the other groups in
1410                            the ACE, or if there's a matching user entry.
1411                            If so, OR in the permissions from that entry. */
1412
1413                         canon_ace *pace_iter;
1414
1415                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1416                                 if (pace_iter->type == SMB_ACL_USER &&
1417                                                 pace_iter->unix_ug.uid == pace->unix_ug.uid) {
1418                                         pace->perms |= pace_iter->perms;
1419                                 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1420                                         if (uid_entry_in_group(pace, pace_iter)) {
1421                                                 pace->perms |= pace_iter->perms;
1422                                         }
1423                                 }
1424                         }
1425
1426                         if (pace->perms == 0) {
1427                                 /* If we only got an "everyone" perm, just use that. */
1428                                 if (got_other)
1429                                         pace->perms = pace_other->perms;
1430                         }
1431
1432                         if (!is_default_acl) {
1433                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1434                         }
1435                 } else {
1436                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1437                 }
1438
1439                 DLIST_ADD(*pp_ace, pace);
1440         }
1441
1442         if (!got_grp) {
1443                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1444                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1445                         return False;
1446                 }
1447
1448                 ZERO_STRUCTP(pace);
1449                 pace->type = SMB_ACL_GROUP_OBJ;
1450                 pace->owner_type = GID_ACE;
1451                 pace->unix_ug.uid = pst->st_ex_gid;
1452                 pace->trustee = *pfile_grp_sid;
1453                 pace->attr = ALLOW_ACE;
1454                 if (setting_acl) {
1455                         /* If we only got an "everyone" perm, just use that. */
1456                         if (got_other)
1457                                 pace->perms = pace_other->perms;
1458                         else
1459                                 pace->perms = 0;
1460                         if (!is_default_acl) {
1461                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1462                         }
1463                 } else {
1464                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1465                 }
1466
1467                 DLIST_ADD(*pp_ace, pace);
1468         }
1469
1470         if (!got_other) {
1471                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1472                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1473                         return False;
1474                 }
1475
1476                 ZERO_STRUCTP(pace);
1477                 pace->type = SMB_ACL_OTHER;
1478                 pace->owner_type = WORLD_ACE;
1479                 pace->unix_ug.world = -1;
1480                 pace->trustee = global_sid_World;
1481                 pace->attr = ALLOW_ACE;
1482                 if (setting_acl) {
1483                         pace->perms = 0;
1484                         if (!is_default_acl) {
1485                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1486                         }
1487                 } else
1488                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1489
1490                 DLIST_ADD(*pp_ace, pace);
1491         }
1492
1493         return True;
1494 }
1495
1496 /****************************************************************************
1497  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1498  If it does not have them, check if there are any entries where the trustee is the
1499  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1500  Note we must not do this to default directory ACLs.
1501 ****************************************************************************/
1502
1503 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1504 {
1505         bool got_user_obj, got_group_obj;
1506         canon_ace *current_ace;
1507         int i, entries;
1508
1509         entries = count_canon_ace_list(ace);
1510         got_user_obj = False;
1511         got_group_obj = False;
1512
1513         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1514                 if (current_ace->type == SMB_ACL_USER_OBJ)
1515                         got_user_obj = True;
1516                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1517                         got_group_obj = True;
1518         }
1519         if (got_user_obj && got_group_obj) {
1520                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1521                 return;
1522         }
1523
1524         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1525                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1526                                 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1527                         current_ace->type = SMB_ACL_USER_OBJ;
1528                         got_user_obj = True;
1529                 }
1530                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1531                                 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1532                         current_ace->type = SMB_ACL_GROUP_OBJ;
1533                         got_group_obj = True;
1534                 }
1535         }
1536         if (!got_user_obj)
1537                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1538         if (!got_group_obj)
1539                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1540 }
1541
1542 /****************************************************************************
1543  Unpack a SEC_DESC into two canonical ace lists.
1544 ****************************************************************************/
1545
1546 static bool create_canon_ace_lists(files_struct *fsp,
1547                                         const SMB_STRUCT_STAT *pst,
1548                                         DOM_SID *pfile_owner_sid,
1549                                         DOM_SID *pfile_grp_sid,
1550                                         canon_ace **ppfile_ace,
1551                                         canon_ace **ppdir_ace,
1552                                         const SEC_ACL *dacl)
1553 {
1554         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1555         canon_ace *file_ace = NULL;
1556         canon_ace *dir_ace = NULL;
1557         canon_ace *current_ace = NULL;
1558         bool got_dir_allow = False;
1559         bool got_file_allow = False;
1560         int i, j;
1561
1562         *ppfile_ace = NULL;
1563         *ppdir_ace = NULL;
1564
1565         /*
1566          * Convert the incoming ACL into a more regular form.
1567          */
1568
1569         for(i = 0; i < dacl->num_aces; i++) {
1570                 SEC_ACE *psa = &dacl->aces[i];
1571
1572                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1573                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1574                         return False;
1575                 }
1576
1577                 if (nt4_compatible_acls()) {
1578                         /*
1579                          * The security mask may be UNIX_ACCESS_NONE which should map into
1580                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1581                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1582                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1583                          */
1584
1585                         /*
1586                          * Convert GENERIC bits to specific bits.
1587                          */
1588
1589                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1590
1591                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1592
1593                         if(psa->access_mask != UNIX_ACCESS_NONE)
1594                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1595                 }
1596         }
1597
1598         /*
1599          * Deal with the fact that NT 4.x re-writes the canonical format
1600          * that we return for default ACLs. If a directory ACE is identical
1601          * to a inherited directory ACE then NT changes the bits so that the
1602          * first ACE is set to OI|IO and the second ACE for this SID is set
1603          * to CI. We need to repair this. JRA.
1604          */
1605
1606         for(i = 0; i < dacl->num_aces; i++) {
1607                 SEC_ACE *psa1 = &dacl->aces[i];
1608
1609                 for (j = i + 1; j < dacl->num_aces; j++) {
1610                         SEC_ACE *psa2 = &dacl->aces[j];
1611
1612                         if (psa1->access_mask != psa2->access_mask)
1613                                 continue;
1614
1615                         if (!sid_equal(&psa1->trustee, &psa2->trustee))
1616                                 continue;
1617
1618                         /*
1619                          * Ok - permission bits and SIDs are equal.
1620                          * Check if flags were re-written.
1621                          */
1622
1623                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1624
1625                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1626                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1627
1628                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1629
1630                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1631                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1632
1633                         }
1634                 }
1635         }
1636
1637         for(i = 0; i < dacl->num_aces; i++) {
1638                 SEC_ACE *psa = &dacl->aces[i];
1639
1640                 /*
1641                  * Create a cannon_ace entry representing this NT DACL ACE.
1642                  */
1643
1644                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1645                         free_canon_ace_list(file_ace);
1646                         free_canon_ace_list(dir_ace);
1647                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1648                         return False;
1649                 }
1650
1651                 ZERO_STRUCTP(current_ace);
1652
1653                 sid_copy(&current_ace->trustee, &psa->trustee);
1654
1655                 /*
1656                  * Try and work out if the SID is a user or group
1657                  * as we need to flag these differently for POSIX.
1658                  * Note what kind of a POSIX ACL this should map to.
1659                  */
1660
1661                 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1662                         current_ace->owner_type = WORLD_ACE;
1663                         current_ace->unix_ug.world = -1;
1664                         current_ace->type = SMB_ACL_OTHER;
1665                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1666                         current_ace->owner_type = UID_ACE;
1667                         current_ace->unix_ug.uid = pst->st_ex_uid;
1668                         current_ace->type = SMB_ACL_USER_OBJ;
1669
1670                         /*
1671                          * The Creator Owner entry only specifies inheritable permissions,
1672                          * never access permissions. WinNT doesn't always set the ACE to
1673                          * INHERIT_ONLY, though.
1674                          */
1675
1676                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1677
1678                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1679                         current_ace->owner_type = GID_ACE;
1680                         current_ace->unix_ug.gid = pst->st_ex_gid;
1681                         current_ace->type = SMB_ACL_GROUP_OBJ;
1682
1683                         /*
1684                          * The Creator Group entry only specifies inheritable permissions,
1685                          * never access permissions. WinNT doesn't always set the ACE to
1686                          * INHERIT_ONLY, though.
1687                          */
1688                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1689
1690                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1691                         current_ace->owner_type = UID_ACE;
1692                         /* If it's the owning user, this is a user_obj, not
1693                          * a user. */
1694                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1695                                 current_ace->type = SMB_ACL_USER_OBJ;
1696                         } else {
1697                                 current_ace->type = SMB_ACL_USER;
1698                         }
1699                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1700                         current_ace->owner_type = GID_ACE;
1701                         /* If it's the primary group, this is a group_obj, not
1702                          * a group. */
1703                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1704                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1705                         } else {
1706                                 current_ace->type = SMB_ACL_GROUP;
1707                         }
1708                 } else {
1709                         /*
1710                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1711                          */
1712
1713                         if (non_mappable_sid(&psa->trustee)) {
1714                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1715                                            "non-mappable SID %s\n",
1716                                            sid_string_dbg(&psa->trustee)));
1717                                 SAFE_FREE(current_ace);
1718                                 continue;
1719                         }
1720
1721                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1722                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1723                                         "unknown or foreign SID %s\n",
1724                                         sid_string_dbg(&psa->trustee)));
1725                                         SAFE_FREE(current_ace);
1726                                 continue;
1727                         }
1728
1729                         free_canon_ace_list(file_ace);
1730                         free_canon_ace_list(dir_ace);
1731                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1732                                   "%s to uid or gid.\n",
1733                                   sid_string_dbg(&current_ace->trustee)));
1734                         SAFE_FREE(current_ace);
1735                         return False;
1736                 }
1737
1738                 /*
1739                  * Map the given NT permissions into a UNIX mode_t containing only
1740                  * S_I(R|W|X)USR bits.
1741                  */
1742
1743                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1744                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1745
1746                 /* Store the ace_flag. */
1747                 current_ace->ace_flags = psa->flags;
1748
1749                 /*
1750                  * Now add the created ace to either the file list, the directory
1751                  * list, or both. We *MUST* preserve the order here (hence we use
1752                  * DLIST_ADD_END) as NT ACLs are order dependent.
1753                  */
1754
1755                 if (fsp->is_directory) {
1756
1757                         /*
1758                          * We can only add to the default POSIX ACE list if the ACE is
1759                          * designed to be inherited by both files and directories.
1760                          */
1761
1762                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1763                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1764
1765                                 canon_ace *current_dir_ace = current_ace;
1766                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1767
1768                                 /*
1769                                  * Note if this was an allow ace. We can't process
1770                                  * any further deny ace's after this.
1771                                  */
1772
1773                                 if (current_ace->attr == ALLOW_ACE)
1774                                         got_dir_allow = True;
1775
1776                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1777                                         DEBUG(0,("create_canon_ace_lists: "
1778                                                  "malformed ACL in "
1779                                                  "inheritable ACL! Deny entry "
1780                                                  "after Allow entry. Failing "
1781                                                  "to set on file %s.\n",
1782                                                  fsp_str_dbg(fsp)));
1783                                         free_canon_ace_list(file_ace);
1784                                         free_canon_ace_list(dir_ace);
1785                                         return False;
1786                                 }
1787
1788                                 if( DEBUGLVL( 10 )) {
1789                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1790                                         print_canon_ace( current_ace, 0);
1791                                 }
1792
1793                                 /*
1794                                  * If this is not an inherit only ACE we need to add a duplicate
1795                                  * to the file acl.
1796                                  */
1797
1798                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1799                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1800
1801                                         if (!dup_ace) {
1802                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1803                                                 free_canon_ace_list(file_ace);
1804                                                 free_canon_ace_list(dir_ace);
1805                                                 return False;
1806                                         }
1807
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 = dup_ace;
1813                                         /* We've essentially split this ace into two,
1814                                          * and added the ace with inheritance request
1815                                          * bits to the directory ACL. Drop those bits for
1816                                          * the ACE we're adding to the file list. */
1817                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1818                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1819                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1820                                 } else {
1821                                         /*
1822                                          * We must not free current_ace here as its
1823                                          * pointer is now owned by the dir_ace list.
1824                                          */
1825                                         current_ace = NULL;
1826                                 }
1827
1828                                 /*
1829                                  * current_ace is now either owned by file_ace
1830                                  * or is NULL. We can safely operate on current_dir_ace
1831                                  * to treat mapping for default acl entries differently
1832                                  * than access acl entries.
1833                                  */
1834
1835                                 if (current_dir_ace->owner_type == UID_ACE) {
1836                                         /*
1837                                          * We already decided above this is a uid,
1838                                          * for default acls ace's only CREATOR_OWNER
1839                                          * maps to ACL_USER_OBJ. All other uid
1840                                          * ace's are ACL_USER.
1841                                          */
1842                                         if (sid_equal(&current_dir_ace->trustee,
1843                                                         &global_sid_Creator_Owner)) {
1844                                                 current_dir_ace->type = SMB_ACL_USER_OBJ;
1845                                         } else {
1846                                                 current_dir_ace->type = SMB_ACL_USER;
1847                                         }
1848                                 }
1849
1850                                 if (current_dir_ace->owner_type == GID_ACE) {
1851                                         /*
1852                                          * We already decided above this is a gid,
1853                                          * for default acls ace's only CREATOR_GROUP
1854                                          * maps to ACL_GROUP_OBJ. All other uid
1855                                          * ace's are ACL_GROUP.
1856                                          */
1857                                         if (sid_equal(&current_dir_ace->trustee,
1858                                                         &global_sid_Creator_Group)) {
1859                                                 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1860                                         } else {
1861                                                 current_dir_ace->type = SMB_ACL_GROUP;
1862                                         }
1863                                 }
1864                         }
1865                 }
1866
1867                 /*
1868                  * Only add to the file ACL if not inherit only.
1869                  */
1870
1871                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1872                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1873
1874                         /*
1875                          * Note if this was an allow ace. We can't process
1876                          * any further deny ace's after this.
1877                          */
1878
1879                         if (current_ace->attr == ALLOW_ACE)
1880                                 got_file_allow = True;
1881
1882                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1883                                 DEBUG(0,("create_canon_ace_lists: malformed "
1884                                          "ACL in file ACL ! Deny entry after "
1885                                          "Allow entry. Failing to set on file "
1886                                          "%s.\n", fsp_str_dbg(fsp)));
1887                                 free_canon_ace_list(file_ace);
1888                                 free_canon_ace_list(dir_ace);
1889                                 return False;
1890                         }
1891
1892                         if( DEBUGLVL( 10 )) {
1893                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1894                                 print_canon_ace( current_ace, 0);
1895                         }
1896                         all_aces_are_inherit_only = False;
1897                         /*
1898                          * We must not free current_ace here as its
1899                          * pointer is now owned by the file_ace list.
1900                          */
1901                         current_ace = NULL;
1902                 }
1903
1904                 /*
1905                  * Free if ACE was not added.
1906                  */
1907
1908                 SAFE_FREE(current_ace);
1909         }
1910
1911         if (fsp->is_directory && all_aces_are_inherit_only) {
1912                 /*
1913                  * Windows 2000 is doing one of these weird 'inherit acl'
1914                  * traverses to conserve NTFS ACL resources. Just pretend
1915                  * there was no DACL sent. JRA.
1916                  */
1917
1918                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1919                 free_canon_ace_list(file_ace);
1920                 free_canon_ace_list(dir_ace);
1921                 file_ace = NULL;
1922                 dir_ace = NULL;
1923         } else {
1924                 /*
1925                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
1926                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1927                  * entries can be converted to *_OBJ. Don't do this for the default
1928                  * ACL, we will create them separately for this if needed inside
1929                  * ensure_canon_entry_valid().
1930                  */
1931                 if (file_ace) {
1932                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1933                 }
1934         }
1935
1936         *ppfile_ace = file_ace;
1937         *ppdir_ace = dir_ace;
1938
1939         return True;
1940 }
1941
1942 /****************************************************************************
1943  ASCII art time again... JRA :-).
1944
1945  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1946  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1947  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1948  allow or deny have been merged, so the same SID can only appear once in the deny
1949  list or once in the allow list.
1950
1951  We then process as follows :
1952
1953  ---------------------------------------------------------------------------
1954  First pass - look for a Everyone DENY entry.
1955
1956  If it is deny all (rwx) trunate the list at this point.
1957  Else, walk the list from this point and use the deny permissions of this
1958  entry as a mask on all following allow entries. Finally, delete
1959  the Everyone DENY entry (we have applied it to everything possible).
1960
1961  In addition, in this pass we remove any DENY entries that have
1962  no permissions (ie. they are a DENY nothing).
1963  ---------------------------------------------------------------------------
1964  Second pass - only deal with deny user entries.
1965
1966  DENY user1 (perms XXX)
1967
1968  new_perms = 0
1969  for all following allow group entries where user1 is in group
1970         new_perms |= group_perms;
1971
1972  user1 entry perms = new_perms & ~ XXX;
1973
1974  Convert the deny entry to an allow entry with the new perms and
1975  push to the end of the list. Note if the user was in no groups
1976  this maps to a specific allow nothing entry for this user.
1977
1978  The common case from the NT ACL choser (userX deny all) is
1979  optimised so we don't do the group lookup - we just map to
1980  an allow nothing entry.
1981
1982  What we're doing here is inferring the allow permissions the
1983  person setting the ACE on user1 wanted by looking at the allow
1984  permissions on the groups the user is currently in. This will
1985  be a snapshot, depending on group membership but is the best
1986  we can do and has the advantage of failing closed rather than
1987  open.
1988  ---------------------------------------------------------------------------
1989  Third pass - only deal with deny group entries.
1990
1991  DENY group1 (perms XXX)
1992
1993  for all following allow user entries where user is in group1
1994    user entry perms = user entry perms & ~ XXX;
1995
1996  If there is a group Everyone allow entry with permissions YYY,
1997  convert the group1 entry to an allow entry and modify its
1998  permissions to be :
1999
2000  new_perms = YYY & ~ XXX
2001
2002  and push to the end of the list.
2003
2004  If there is no group Everyone allow entry then convert the
2005  group1 entry to a allow nothing entry and push to the end of the list.
2006
2007  Note that the common case from the NT ACL choser (groupX deny all)
2008  cannot be optimised here as we need to modify user entries who are
2009  in the group to change them to a deny all also.
2010
2011  What we're doing here is modifying the allow permissions of
2012  user entries (which are more specific in POSIX ACLs) to mask
2013  out the explicit deny set on the group they are in. This will
2014  be a snapshot depending on current group membership but is the
2015  best we can do and has the advantage of failing closed rather
2016  than open.
2017  ---------------------------------------------------------------------------
2018  Fourth pass - cope with cumulative permissions.
2019
2020  for all allow user entries, if there exists an allow group entry with
2021  more permissive permissions, and the user is in that group, rewrite the
2022  allow user permissions to contain both sets of permissions.
2023
2024  Currently the code for this is #ifdef'ed out as these semantics make
2025  no sense to me. JRA.
2026  ---------------------------------------------------------------------------
2027
2028  Note we *MUST* do the deny user pass first as this will convert deny user
2029  entries into allow user entries which can then be processed by the deny
2030  group pass.
2031
2032  The above algorithm took a *lot* of thinking about - hence this
2033  explaination :-). JRA.
2034 ****************************************************************************/
2035
2036 /****************************************************************************
2037  Process a canon_ace list entries. This is very complex code. We need
2038  to go through and remove the "deny" permissions from any allow entry that matches
2039  the id of this entry. We have already refused any NT ACL that wasn't in correct
2040  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2041  we just remove it (to fail safe). We have already removed any duplicate ace
2042  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2043  allow entries.
2044 ****************************************************************************/
2045
2046 static void process_deny_list( canon_ace **pp_ace_list )
2047 {
2048         canon_ace *ace_list = *pp_ace_list;
2049         canon_ace *curr_ace = NULL;
2050         canon_ace *curr_ace_next = NULL;
2051
2052         /* Pass 1 above - look for an Everyone, deny entry. */
2053
2054         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2055                 canon_ace *allow_ace_p;
2056
2057                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2058
2059                 if (curr_ace->attr != DENY_ACE)
2060                         continue;
2061
2062                 if (curr_ace->perms == (mode_t)0) {
2063
2064                         /* Deny nothing entry - delete. */
2065
2066                         DLIST_REMOVE(ace_list, curr_ace);
2067                         continue;
2068                 }
2069
2070                 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2071                         continue;
2072
2073                 /* JRATEST - assert. */
2074                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2075
2076                 if (curr_ace->perms == ALL_ACE_PERMS) {
2077
2078                         /*
2079                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2080                          * list at this point including this entry.
2081                          */
2082
2083                         canon_ace *prev_entry = curr_ace->prev;
2084
2085                         free_canon_ace_list( curr_ace );
2086                         if (prev_entry)
2087                                 prev_entry->next = NULL;
2088                         else {
2089                                 /* We deleted the entire list. */
2090                                 ace_list = NULL;
2091                         }
2092                         break;
2093                 }
2094
2095                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2096
2097                         /*
2098                          * Only mask off allow entries.
2099                          */
2100
2101                         if (allow_ace_p->attr != ALLOW_ACE)
2102                                 continue;
2103
2104                         allow_ace_p->perms &= ~curr_ace->perms;
2105                 }
2106
2107                 /*
2108                  * Now it's been applied, remove it.
2109                  */
2110
2111                 DLIST_REMOVE(ace_list, curr_ace);
2112         }
2113
2114         /* Pass 2 above - deal with deny user entries. */
2115
2116         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2117                 mode_t new_perms = (mode_t)0;
2118                 canon_ace *allow_ace_p;
2119
2120                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2121
2122                 if (curr_ace->attr != DENY_ACE)
2123                         continue;
2124
2125                 if (curr_ace->owner_type != UID_ACE)
2126                         continue;
2127
2128                 if (curr_ace->perms == ALL_ACE_PERMS) {
2129
2130                         /*
2131                          * Optimisation - this is a deny everything to this user.
2132                          * Convert to an allow nothing and push to the end of the list.
2133                          */
2134
2135                         curr_ace->attr = ALLOW_ACE;
2136                         curr_ace->perms = (mode_t)0;
2137                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2138                         continue;
2139                 }
2140
2141                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2142
2143                         if (allow_ace_p->attr != ALLOW_ACE)
2144                                 continue;
2145
2146                         /* We process GID_ACE and WORLD_ACE entries only. */
2147
2148                         if (allow_ace_p->owner_type == UID_ACE)
2149                                 continue;
2150
2151                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2152                                 new_perms |= allow_ace_p->perms;
2153                 }
2154
2155                 /*
2156                  * Convert to a allow entry, modify the perms and push to the end
2157                  * of the list.
2158                  */
2159
2160                 curr_ace->attr = ALLOW_ACE;
2161                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2162                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2163         }
2164
2165         /* Pass 3 above - deal with deny group entries. */
2166
2167         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2168                 canon_ace *allow_ace_p;
2169                 canon_ace *allow_everyone_p = NULL;
2170
2171                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2172
2173                 if (curr_ace->attr != DENY_ACE)
2174                         continue;
2175
2176                 if (curr_ace->owner_type != GID_ACE)
2177                         continue;
2178
2179                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2180
2181                         if (allow_ace_p->attr != ALLOW_ACE)
2182                                 continue;
2183
2184                         /* Store a pointer to the Everyone allow, if it exists. */
2185                         if (allow_ace_p->owner_type == WORLD_ACE)
2186                                 allow_everyone_p = allow_ace_p;
2187
2188                         /* We process UID_ACE entries only. */
2189
2190                         if (allow_ace_p->owner_type != UID_ACE)
2191                                 continue;
2192
2193                         /* Mask off the deny group perms. */
2194
2195                         if (uid_entry_in_group( allow_ace_p, curr_ace))
2196                                 allow_ace_p->perms &= ~curr_ace->perms;
2197                 }
2198
2199                 /*
2200                  * Convert the deny to an allow with the correct perms and
2201                  * push to the end of the list.
2202                  */
2203
2204                 curr_ace->attr = ALLOW_ACE;
2205                 if (allow_everyone_p)
2206                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2207                 else
2208                         curr_ace->perms = (mode_t)0;
2209                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2210         }
2211
2212         /* Doing this fourth pass allows Windows semantics to be layered
2213          * on top of POSIX semantics. I'm not sure if this is desirable.
2214          * For example, in W2K ACLs there is no way to say, "Group X no
2215          * access, user Y full access" if user Y is a member of group X.
2216          * This seems completely broken semantics to me.... JRA.
2217          */
2218
2219 #if 0
2220         /* Pass 4 above - deal with allow entries. */
2221
2222         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2223                 canon_ace *allow_ace_p;
2224
2225                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2226
2227                 if (curr_ace->attr != ALLOW_ACE)
2228                         continue;
2229
2230                 if (curr_ace->owner_type != UID_ACE)
2231                         continue;
2232
2233                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2234
2235                         if (allow_ace_p->attr != ALLOW_ACE)
2236                                 continue;
2237
2238                         /* We process GID_ACE entries only. */
2239
2240                         if (allow_ace_p->owner_type != GID_ACE)
2241                                 continue;
2242
2243                         /* OR in the group perms. */
2244
2245                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2246                                 curr_ace->perms |= allow_ace_p->perms;
2247                 }
2248         }
2249 #endif
2250
2251         *pp_ace_list = ace_list;
2252 }
2253
2254 /****************************************************************************
2255  Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2256  succeeding.
2257 ****************************************************************************/
2258
2259 static bool unpack_canon_ace(files_struct *fsp,
2260                                 const SMB_STRUCT_STAT *pst,
2261                                 DOM_SID *pfile_owner_sid,
2262                                 DOM_SID *pfile_grp_sid,
2263                                 canon_ace **ppfile_ace,
2264                                 canon_ace **ppdir_ace,
2265                                 uint32 security_info_sent,
2266                                 const SEC_DESC *psd)
2267 {
2268         canon_ace *file_ace = NULL;
2269         canon_ace *dir_ace = NULL;
2270
2271         *ppfile_ace = NULL;
2272         *ppdir_ace = NULL;
2273
2274         if(security_info_sent == 0) {
2275                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2276                 return False;
2277         }
2278
2279         /*
2280          * If no DACL then this is a chown only security descriptor.
2281          */
2282
2283         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2284                 return True;
2285
2286         /*
2287          * Now go through the DACL and create the canon_ace lists.
2288          */
2289
2290         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2291                                                                 &file_ace, &dir_ace, psd->dacl))
2292                 return False;
2293
2294         if ((file_ace == NULL) && (dir_ace == NULL)) {
2295                 /* W2K traverse DACL set - ignore. */
2296                 return True;
2297         }
2298
2299         /*
2300          * Go through the canon_ace list and merge entries
2301          * belonging to identical users of identical allow or deny type.
2302          * We can do this as all deny entries come first, followed by
2303          * all allow entries (we have mandated this before accepting this acl).
2304          */
2305
2306         print_canon_ace_list( "file ace - before merge", file_ace);
2307         merge_aces( &file_ace, false);
2308
2309         print_canon_ace_list( "dir ace - before merge", dir_ace);
2310         merge_aces( &dir_ace, true);
2311
2312         /*
2313          * NT ACLs are order dependent. Go through the acl lists and
2314          * process DENY entries by masking the allow entries.
2315          */
2316
2317         print_canon_ace_list( "file ace - before deny", file_ace);
2318         process_deny_list( &file_ace);
2319
2320         print_canon_ace_list( "dir ace - before deny", dir_ace);
2321         process_deny_list( &dir_ace);
2322
2323         /*
2324          * A well formed POSIX file or default ACL has at least 3 entries, a
2325          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2326          * and optionally a mask entry. Ensure this is the case.
2327          */
2328
2329         print_canon_ace_list( "file ace - before valid", file_ace);
2330
2331         if (!ensure_canon_entry_valid(&file_ace, false, fsp->conn->params,
2332                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2333                 free_canon_ace_list(file_ace);
2334                 free_canon_ace_list(dir_ace);
2335                 return False;
2336         }
2337
2338         print_canon_ace_list( "dir ace - before valid", dir_ace);
2339
2340         if (dir_ace && !ensure_canon_entry_valid(&dir_ace, true, fsp->conn->params,
2341                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2342                 free_canon_ace_list(file_ace);
2343                 free_canon_ace_list(dir_ace);
2344                 return False;
2345         }
2346
2347         print_canon_ace_list( "file ace - return", file_ace);
2348         print_canon_ace_list( "dir ace - return", dir_ace);
2349
2350         *ppfile_ace = file_ace;
2351         *ppdir_ace = dir_ace;
2352         return True;
2353
2354 }
2355
2356 /******************************************************************************
2357  When returning permissions, try and fit NT display
2358  semantics if possible. Note the the canon_entries here must have been malloced.
2359  The list format should be - first entry = owner, followed by group and other user
2360  entries, last entry = other.
2361
2362  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2363  are not ordered, and match on the most specific entry rather than walking a list,
2364  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2365
2366  Entry 0: owner : deny all except read and write.
2367  Entry 1: owner : allow read and write.
2368  Entry 2: group : deny all except read.
2369  Entry 3: group : allow read.
2370  Entry 4: Everyone : allow read.
2371
2372  But NT cannot display this in their ACL editor !
2373 ********************************************************************************/
2374
2375 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2376 {
2377         canon_ace *l_head = *pp_list_head;
2378         canon_ace *owner_ace = NULL;
2379         canon_ace *other_ace = NULL;
2380         canon_ace *ace = NULL;
2381
2382         for (ace = l_head; ace; ace = ace->next) {
2383                 if (ace->type == SMB_ACL_USER_OBJ)
2384                         owner_ace = ace;
2385                 else if (ace->type == SMB_ACL_OTHER) {
2386                         /* Last ace - this is "other" */
2387                         other_ace = ace;
2388                 }
2389         }
2390
2391         if (!owner_ace || !other_ace) {
2392                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2393                         filename ));
2394                 return;
2395         }
2396
2397         /*
2398          * The POSIX algorithm applies to owner first, and other last,
2399          * so ensure they are arranged in this order.
2400          */
2401
2402         if (owner_ace) {
2403                 DLIST_PROMOTE(l_head, owner_ace);
2404         }
2405
2406         if (other_ace) {
2407                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2408         }
2409
2410         /* We have probably changed the head of the list. */
2411
2412         *pp_list_head = l_head;
2413 }
2414
2415 /****************************************************************************
2416  Create a linked list of canonical ACE entries.
2417 ****************************************************************************/
2418
2419 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2420                                    const char *fname, SMB_ACL_T posix_acl,
2421                                    const SMB_STRUCT_STAT *psbuf,
2422                                    const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2423 {
2424         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2425         canon_ace *l_head = NULL;
2426         canon_ace *ace = NULL;
2427         canon_ace *next_ace = NULL;
2428         int entry_id = SMB_ACL_FIRST_ENTRY;
2429         bool is_default_acl = (the_acl_type == SMB_ACL_TYPE_DEFAULT);
2430         SMB_ACL_ENTRY_T entry;
2431         size_t ace_count;
2432
2433         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2434                 SMB_ACL_TAG_T tagtype;
2435                 SMB_ACL_PERMSET_T permset;
2436                 DOM_SID sid;
2437                 posix_id unix_ug;
2438                 enum ace_owner owner_type;
2439
2440                 entry_id = SMB_ACL_NEXT_ENTRY;
2441
2442                 /* Is this a MASK entry ? */
2443                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2444                         continue;
2445
2446                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2447                         continue;
2448
2449                 /* Decide which SID to use based on the ACL type. */
2450                 switch(tagtype) {
2451                         case SMB_ACL_USER_OBJ:
2452                                 /* Get the SID from the owner. */
2453                                 sid_copy(&sid, powner);
2454                                 unix_ug.uid = psbuf->st_ex_uid;
2455                                 owner_type = UID_ACE;
2456                                 break;
2457                         case SMB_ACL_USER:
2458                                 {
2459                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2460                                         if (puid == NULL) {
2461                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2462                                                 continue;
2463                                         }
2464                                         uid_to_sid( &sid, *puid);
2465                                         unix_ug.uid = *puid;
2466                                         owner_type = UID_ACE;
2467                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2468                                         break;
2469                                 }
2470                         case SMB_ACL_GROUP_OBJ:
2471                                 /* Get the SID from the owning group. */
2472                                 sid_copy(&sid, pgroup);
2473                                 unix_ug.gid = psbuf->st_ex_gid;
2474                                 owner_type = GID_ACE;
2475                                 break;
2476                         case SMB_ACL_GROUP:
2477                                 {
2478                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2479                                         if (pgid == NULL) {
2480                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2481                                                 continue;
2482                                         }
2483                                         gid_to_sid( &sid, *pgid);
2484                                         unix_ug.gid = *pgid;
2485                                         owner_type = GID_ACE;
2486                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2487                                         break;
2488                                 }
2489                         case SMB_ACL_MASK:
2490                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2491                                 continue; /* Don't count the mask as an entry. */
2492                         case SMB_ACL_OTHER:
2493                                 /* Use the Everyone SID */
2494                                 sid = global_sid_World;
2495                                 unix_ug.world = -1;
2496                                 owner_type = WORLD_ACE;
2497                                 break;
2498                         default:
2499                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2500                                 continue;
2501                 }
2502
2503                 /*
2504                  * Add this entry to the list.
2505                  */
2506
2507                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2508                         goto fail;
2509
2510                 ZERO_STRUCTP(ace);
2511                 ace->type = tagtype;
2512                 ace->perms = convert_permset_to_mode_t(conn, permset);
2513                 ace->attr = ALLOW_ACE;
2514                 ace->trustee = sid;
2515                 ace->unix_ug = unix_ug;
2516                 ace->owner_type = owner_type;
2517                 ace->ace_flags = get_pai_flags(pal, ace, is_default_acl);
2518
2519                 DLIST_ADD(l_head, ace);
2520         }
2521
2522         /*
2523          * This next call will ensure we have at least a user/group/world set.
2524          */
2525
2526         if (!ensure_canon_entry_valid(&l_head, is_default_acl, conn->params,
2527                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2528                                       psbuf, False))
2529                 goto fail;
2530
2531         /*
2532          * Now go through the list, masking the permissions with the
2533          * acl_mask. Ensure all DENY Entries are at the start of the list.
2534          */
2535
2536         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", is_default_acl ?  "Default" : "Access"));
2537
2538         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2539                 next_ace = ace->next;
2540
2541                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2542                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2543                         ace->perms &= acl_mask;
2544
2545                 if (ace->perms == 0) {
2546                         DLIST_PROMOTE(l_head, ace);
2547                 }
2548
2549                 if( DEBUGLVL( 10 ) ) {
2550                         print_canon_ace(ace, ace_count);
2551                 }
2552         }
2553
2554         arrange_posix_perms(fname,&l_head );
2555
2556         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2557
2558         return l_head;
2559
2560   fail:
2561
2562         free_canon_ace_list(l_head);
2563         return NULL;
2564 }
2565
2566 /****************************************************************************
2567  Check if the current user group list contains a given group.
2568 ****************************************************************************/
2569
2570 bool current_user_in_group(gid_t gid)
2571 {
2572         int i;
2573
2574         for (i = 0; i < current_user.ut.ngroups; i++) {
2575                 if (current_user.ut.groups[i] == gid) {
2576                         return True;
2577                 }
2578         }
2579
2580         return False;
2581 }
2582
2583 /****************************************************************************
2584  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2585 ****************************************************************************/
2586
2587 static bool acl_group_override(connection_struct *conn,
2588                                const struct smb_filename *smb_fname)
2589 {
2590         if ((errno != EPERM) && (errno != EACCES)) {
2591                 return false;
2592         }
2593
2594         /* file primary group == user primary or supplementary group */
2595         if (lp_acl_group_control(SNUM(conn)) &&
2596             current_user_in_group(smb_fname->st.st_ex_gid)) {
2597                 return true;
2598         }
2599
2600         /* user has writeable permission */
2601         if (lp_dos_filemode(SNUM(conn)) &&
2602             can_write_to_file(conn, smb_fname)) {
2603                 return true;
2604         }
2605
2606         return false;
2607 }
2608
2609 /****************************************************************************
2610  Attempt to apply an ACL to a file or directory.
2611 ****************************************************************************/
2612
2613 static bool set_canon_ace_list(files_struct *fsp,
2614                                 canon_ace *the_ace,
2615                                 bool default_ace,
2616                                 const SMB_STRUCT_STAT *psbuf,
2617                                 bool *pacl_set_support)
2618 {
2619         connection_struct *conn = fsp->conn;
2620         bool ret = False;
2621         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2622         canon_ace *p_ace;
2623         int i;
2624         SMB_ACL_ENTRY_T mask_entry;
2625         bool got_mask_entry = False;
2626         SMB_ACL_PERMSET_T mask_permset;
2627         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2628         bool needs_mask = False;
2629         mode_t mask_perms = 0;
2630
2631         /* Use the psbuf that was passed in. */
2632         if (psbuf != &fsp->fsp_name->st) {
2633                 fsp->fsp_name->st = *psbuf;
2634         }
2635
2636 #if defined(POSIX_ACL_NEEDS_MASK)
2637         /* HP-UX always wants to have a mask (called "class" there). */
2638         needs_mask = True;
2639 #endif
2640
2641         if (the_acl == NULL) {
2642
2643                 if (!no_acl_syscall_error(errno)) {
2644                         /*
2645                          * Only print this error message if we have some kind of ACL
2646                          * support that's not working. Otherwise we would always get this.
2647                          */
2648                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2649                                 default_ace ? "default" : "file", strerror(errno) ));
2650                 }
2651                 *pacl_set_support = False;
2652                 goto fail;
2653         }
2654
2655         if( DEBUGLVL( 10 )) {
2656                 dbgtext("set_canon_ace_list: setting ACL:\n");
2657                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2658                         print_canon_ace( p_ace, i);
2659                 }
2660         }
2661
2662         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2663                 SMB_ACL_ENTRY_T the_entry;
2664                 SMB_ACL_PERMSET_T the_permset;
2665
2666                 /*
2667                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2668                  * named group entries. But if there is an ACL_MASK entry, it applies
2669                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2670                  * so that it doesn't deny (i.e., mask off) any permissions.
2671                  */
2672
2673                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2674                         needs_mask = True;
2675                         mask_perms |= p_ace->perms;
2676                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2677                         mask_perms |= p_ace->perms;
2678                 }
2679
2680                 /*
2681                  * Get the entry for this ACE.
2682                  */
2683
2684                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2685                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2686                                 i, strerror(errno) ));
2687                         goto fail;
2688                 }
2689
2690                 if (p_ace->type == SMB_ACL_MASK) {
2691                         mask_entry = the_entry;
2692                         got_mask_entry = True;
2693                 }
2694
2695                 /*
2696                  * Ok - we now know the ACL calls should be working, don't
2697                  * allow fallback to chmod.
2698                  */
2699
2700                 *pacl_set_support = True;
2701
2702                 /*
2703                  * Initialise the entry from the canon_ace.
2704                  */
2705
2706                 /*
2707                  * First tell the entry what type of ACE this is.
2708                  */
2709
2710                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2711                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2712                                 i, strerror(errno) ));
2713                         goto fail;
2714                 }
2715
2716                 /*
2717                  * Only set the qualifier (user or group id) if the entry is a user
2718                  * or group id ACE.
2719                  */
2720
2721                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2722                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2723                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2724                                         i, strerror(errno) ));
2725                                 goto fail;
2726                         }
2727                 }
2728
2729                 /*
2730                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2731                  */
2732
2733                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2734                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2735                                 i, strerror(errno) ));
2736                         goto fail;
2737                 }
2738
2739                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2740                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2741                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2742                         goto fail;
2743                 }
2744
2745                 /*
2746                  * ..and apply them to the entry.
2747                  */
2748
2749                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2750                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2751                                 i, strerror(errno) ));
2752                         goto fail;
2753                 }
2754
2755                 if( DEBUGLVL( 10 ))
2756                         print_canon_ace( p_ace, i);
2757
2758         }
2759
2760         if (needs_mask && !got_mask_entry) {
2761                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2762                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2763                         goto fail;
2764                 }
2765
2766                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2767                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2768                         goto fail;
2769                 }
2770
2771                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2772                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2773                         goto fail;
2774                 }
2775
2776                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2777                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2778                         goto fail;
2779                 }
2780
2781                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2782                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2783                         goto fail;
2784                 }
2785         }
2786
2787         /*
2788          * Finally apply it to the file or directory.
2789          */
2790
2791         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2792                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2793                                              the_acl_type, the_acl) == -1) {
2794                         /*
2795                          * Some systems allow all the above calls and only fail with no ACL support
2796                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2797                          */
2798                         if (no_acl_syscall_error(errno)) {
2799                                 *pacl_set_support = False;
2800                         }
2801
2802                         if (acl_group_override(conn, fsp->fsp_name)) {
2803                                 int sret;
2804
2805                                 DEBUG(5,("set_canon_ace_list: acl group "
2806                                          "control on and current user in file "
2807                                          "%s primary group.\n",
2808                                          fsp_str_dbg(fsp)));
2809
2810                                 become_root();
2811                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2812                                     fsp->fsp_name->base_name, the_acl_type,
2813                                     the_acl);
2814                                 unbecome_root();
2815                                 if (sret == 0) {
2816                                         ret = True;
2817                                 }
2818                         }
2819
2820                         if (ret == False) {
2821                                 DEBUG(2,("set_canon_ace_list: "
2822                                          "sys_acl_set_file type %s failed for "
2823                                          "file %s (%s).\n",
2824                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2825                                          "directory default" : "file",
2826                                          fsp_str_dbg(fsp), strerror(errno)));
2827                                 goto fail;
2828                         }
2829                 }
2830         } else {
2831                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2832                         /*
2833                          * Some systems allow all the above calls and only fail with no ACL support
2834                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2835                          */
2836                         if (no_acl_syscall_error(errno)) {
2837                                 *pacl_set_support = False;
2838                         }
2839
2840                         if (acl_group_override(conn, fsp->fsp_name)) {
2841                                 int sret;
2842
2843                                 DEBUG(5,("set_canon_ace_list: acl group "
2844                                          "control on and current user in file "
2845                                          "%s primary group.\n",
2846                                          fsp_str_dbg(fsp)));
2847
2848                                 become_root();
2849                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2850                                 unbecome_root();
2851                                 if (sret == 0) {
2852                                         ret = True;
2853                                 }
2854                         }
2855
2856                         if (ret == False) {
2857                                 DEBUG(2,("set_canon_ace_list: "
2858                                          "sys_acl_set_file failed for file %s "
2859                                          "(%s).\n",
2860                                          fsp_str_dbg(fsp), strerror(errno)));
2861                                 goto fail;
2862                         }
2863                 }
2864         }
2865
2866         ret = True;
2867
2868   fail:
2869
2870         if (the_acl != NULL) {
2871                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2872         }
2873
2874         return ret;
2875 }
2876
2877 /****************************************************************************
2878  Find a particular canon_ace entry.
2879 ****************************************************************************/
2880
2881 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2882 {
2883         while (list) {
2884                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2885                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2886                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2887                         break;
2888                 list = list->next;
2889         }
2890         return list;
2891 }
2892
2893 /****************************************************************************
2894
2895 ****************************************************************************/
2896
2897 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2898 {
2899         SMB_ACL_ENTRY_T entry;
2900
2901         if (!the_acl)
2902                 return NULL;
2903         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2904                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2905                 return NULL;
2906         }
2907         return the_acl;
2908 }
2909
2910 /****************************************************************************
2911  Convert a canon_ace to a generic 3 element permission - if possible.
2912 ****************************************************************************/
2913
2914 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2915
2916 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2917 {
2918         int snum = SNUM(fsp->conn);
2919         size_t ace_count = count_canon_ace_list(file_ace_list);
2920         canon_ace *ace_p;
2921         canon_ace *owner_ace = NULL;
2922         canon_ace *group_ace = NULL;
2923         canon_ace *other_ace = NULL;
2924         mode_t and_bits;
2925         mode_t or_bits;
2926
2927         if (ace_count != 3) {
2928                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2929                          "entries for file %s to convert to posix perms.\n",
2930                          fsp_str_dbg(fsp)));
2931                 return False;
2932         }
2933
2934         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2935                 if (ace_p->owner_type == UID_ACE)
2936                         owner_ace = ace_p;
2937                 else if (ace_p->owner_type == GID_ACE)
2938                         group_ace = ace_p;
2939                 else if (ace_p->owner_type == WORLD_ACE)
2940                         other_ace = ace_p;
2941         }
2942
2943         if (!owner_ace || !group_ace || !other_ace) {
2944                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
2945                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
2946                 return False;
2947         }
2948
2949         *posix_perms = (mode_t)0;
2950
2951         *posix_perms |= owner_ace->perms;
2952         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2953         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2954         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2955         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2956         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2957         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2958
2959         /* The owner must have at least read access. */
2960
2961         *posix_perms |= S_IRUSR;
2962         if (fsp->is_directory)
2963                 *posix_perms |= (S_IWUSR|S_IXUSR);
2964
2965         /* If requested apply the masks. */
2966
2967         /* Get the initial bits to apply. */
2968
2969         if (fsp->is_directory) {
2970                 and_bits = lp_dir_security_mask(snum);
2971                 or_bits = lp_force_dir_security_mode(snum);
2972         } else {
2973                 and_bits = lp_security_mask(snum);
2974                 or_bits = lp_force_security_mode(snum);
2975         }
2976
2977         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2978
2979         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
2980                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
2981                   (int)group_ace->perms, (int)other_ace->perms,
2982                   (int)*posix_perms, fsp_str_dbg(fsp)));
2983
2984         return True;
2985 }
2986
2987 /****************************************************************************
2988   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2989   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2990   with CI|OI set so it is inherited and also applies to the directory.
2991   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2992 ****************************************************************************/
2993
2994 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2995 {
2996         size_t i, j;
2997
2998         for (i = 0; i < num_aces; i++) {
2999                 for (j = i+1; j < num_aces; j++) {
3000                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3001                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3002                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3003                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3004
3005                         /* We know the lower number ACE's are file entries. */
3006                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3007                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3008                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3009                                 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3010                                 (i_inh == j_inh) &&
3011                                 (i_flags_ni == 0) &&
3012                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3013                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3014                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3015                                 /*
3016                                  * W2K wants to have access allowed zero access ACE's
3017                                  * at the end of the list. If the mask is zero, merge
3018                                  * the non-inherited ACE onto the inherited ACE.
3019                                  */
3020
3021                                 if (nt_ace_list[i].access_mask == 0) {
3022                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3023                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3024                                         if (num_aces - i - 1 > 0)
3025                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3026                                                                 sizeof(SEC_ACE));
3027
3028                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3029                                                 (unsigned int)i, (unsigned int)j ));
3030                                 } else {
3031                                         /*
3032                                          * These are identical except for the flags.
3033                                          * Merge the inherited ACE onto the non-inherited ACE.
3034                                          */
3035
3036                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3037                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3038                                         if (num_aces - j - 1 > 0)
3039                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3040                                                                 sizeof(SEC_ACE));
3041
3042                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3043                                                 (unsigned int)j, (unsigned int)i ));
3044                                 }
3045                                 num_aces--;
3046                                 break;
3047                         }
3048                 }
3049         }
3050
3051         return num_aces;
3052 }
3053
3054 /*
3055  * Add or Replace ACE entry.
3056  * In some cases we need to add a specific ACE for compatibility reasons.
3057  * When doing that we must make sure we are not actually creating a duplicate
3058  * entry. So we need to search whether an ACE entry already exist and eventually
3059  * replacce the access mask, or add a completely new entry if none was found.
3060  *
3061  * This function assumes the array has enough space to add a new entry without
3062  * any reallocation of memory.
3063  */
3064
3065 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3066                                 const DOM_SID *sid, enum security_ace_type type,
3067                                 uint32_t mask, uint8_t flags)
3068 {
3069         int i;
3070
3071         /* first search for a duplicate */
3072         for (i = 0; i < *num_aces; i++) {
3073                 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3074                     (nt_ace_list[i].flags == flags)) break;
3075         }
3076
3077         if (i < *num_aces) { /* found */
3078                 nt_ace_list[i].type = type;
3079                 nt_ace_list[i].access_mask = mask;
3080                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3081                            i, sid_string_dbg(sid), flags));
3082                 return;
3083         }
3084
3085         /* not found, append it */
3086         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3087 }
3088
3089
3090 /****************************************************************************
3091  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3092  the space for the return elements and returns the size needed to return the
3093  security descriptor. This should be the only external function needed for
3094  the UNIX style get ACL.
3095 ****************************************************************************/
3096
3097 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3098                                       const char *name,
3099                                       const SMB_STRUCT_STAT *sbuf,
3100                                       struct pai_val *pal,
3101                                       SMB_ACL_T posix_acl,
3102                                       SMB_ACL_T def_acl,
3103                                       uint32_t security_info,
3104                                       SEC_DESC **ppdesc)
3105 {
3106         DOM_SID owner_sid;
3107         DOM_SID group_sid;
3108         size_t sd_size = 0;
3109         SEC_ACL *psa = NULL;
3110         size_t num_acls = 0;
3111         size_t num_def_acls = 0;
3112         size_t num_aces = 0;
3113         canon_ace *file_ace = NULL;
3114         canon_ace *dir_ace = NULL;
3115         SEC_ACE *nt_ace_list = NULL;
3116         size_t num_profile_acls = 0;
3117         DOM_SID orig_owner_sid;
3118         SEC_DESC *psd = NULL;
3119         int i;
3120
3121         /*
3122          * Get the owner, group and world SIDs.
3123          */
3124
3125         create_file_sids(sbuf, &owner_sid, &group_sid);
3126
3127         if (lp_profile_acls(SNUM(conn))) {
3128                 /* For WXP SP1 the owner must be administrators. */
3129                 sid_copy(&orig_owner_sid, &owner_sid);
3130                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3131                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3132                 num_profile_acls = 3;
3133         }
3134
3135         if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3136
3137                 /*
3138                  * In the optimum case Creator Owner and Creator Group would be used for
3139                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3140                  * would lead to usability problems under Windows: The Creator entries
3141                  * are only available in browse lists of directories and not for files;
3142                  * additionally the identity of the owning group couldn't be determined.
3143                  * We therefore use those identities only for Default ACLs.
3144                  */
3145
3146                 /* Create the canon_ace lists. */
3147                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3148                                             &owner_sid, &group_sid, pal,
3149                                             SMB_ACL_TYPE_ACCESS);
3150
3151                 /* We must have *some* ACLS. */
3152
3153                 if (count_canon_ace_list(file_ace) == 0) {
3154                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3155                         goto done;
3156                 }
3157
3158                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3159                         dir_ace = canonicalise_acl(conn, name, def_acl,
3160                                                    sbuf,
3161                                                    &global_sid_Creator_Owner,
3162                                                    &global_sid_Creator_Group,
3163                                                    pal, SMB_ACL_TYPE_DEFAULT);
3164                 }
3165
3166                 /*
3167                  * Create the NT ACE list from the canonical ace lists.
3168                  */
3169
3170                 {
3171                         canon_ace *ace;
3172                         enum security_ace_type nt_acl_type;
3173
3174                         if (nt4_compatible_acls() && dir_ace) {
3175                                 /*
3176                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3177                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3178                                  * remove entries from the Access ACL if the
3179                                  * corresponding Default ACL entries have also been
3180                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3181                                  * are exceptions. We can do nothing
3182                                  * intelligent if the Default ACL contains entries that
3183                                  * are not also contained in the Access ACL, so this
3184                                  * case will still fail under NT 4.
3185                                  */
3186
3187                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3188                                 if (ace && !ace->perms) {
3189                                         DLIST_REMOVE(dir_ace, ace);
3190                                         SAFE_FREE(ace);
3191
3192                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3193                                         if (ace && !ace->perms) {
3194                                                 DLIST_REMOVE(file_ace, ace);
3195                                                 SAFE_FREE(ace);
3196                                         }
3197                                 }
3198
3199                                 /*
3200                                  * WinNT doesn't usually have Creator Group
3201                                  * in browse lists, so we send this entry to
3202                                  * WinNT even if it contains no relevant
3203                                  * permissions. Once we can add
3204                                  * Creator Group to browse lists we can
3205                                  * re-enable this.
3206                                  */
3207
3208 #if 0
3209                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3210                                 if (ace && !ace->perms) {
3211                                         DLIST_REMOVE(dir_ace, ace);
3212                                         SAFE_FREE(ace);
3213                                 }
3214 #endif
3215
3216                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3217                                 if (ace && !ace->perms) {
3218                                         DLIST_REMOVE(file_ace, ace);
3219                                         SAFE_FREE(ace);
3220                                 }
3221                         }
3222
3223                         num_acls = count_canon_ace_list(file_ace);
3224                         num_def_acls = count_canon_ace_list(dir_ace);
3225
3226                         /* Allocate the ace list. */
3227                         if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3228                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3229                                 goto done;
3230                         }
3231
3232                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3233
3234                         /*
3235                          * Create the NT ACE list from the canonical ace lists.
3236                          */
3237
3238                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3239                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3240                                                 &nt_acl_type,
3241                                                 ace->perms,
3242                                                 S_ISDIR(sbuf->st_ex_mode));
3243                                 init_sec_ace(&nt_ace_list[num_aces++],
3244                                         &ace->trustee,
3245                                         nt_acl_type,
3246                                         acc,
3247                                         ace->ace_flags);
3248                         }
3249
3250                         /* The User must have access to a profile share - even
3251                          * if we can't map the SID. */
3252                         if (lp_profile_acls(SNUM(conn))) {
3253                                 add_or_replace_ace(nt_ace_list, &num_aces,
3254                                                    &global_sid_Builtin_Users,
3255                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3256                                                    FILE_GENERIC_ALL, 0);
3257                         }
3258
3259                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3260                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3261                                                 &nt_acl_type,
3262                                                 ace->perms,
3263                                                 S_ISDIR(sbuf->st_ex_mode));
3264                                 init_sec_ace(&nt_ace_list[num_aces++],
3265                                         &ace->trustee,
3266                                         nt_acl_type,
3267                                         acc,
3268                                         ace->ace_flags |
3269                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3270                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3271                                         SEC_ACE_FLAG_INHERIT_ONLY);
3272                         }
3273
3274                         /* The User must have access to a profile share - even
3275                          * if we can't map the SID. */
3276                         if (lp_profile_acls(SNUM(conn))) {
3277                                 add_or_replace_ace(nt_ace_list, &num_aces,
3278                                                 &global_sid_Builtin_Users,
3279                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3280                                                 FILE_GENERIC_ALL,
3281                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3282                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3283                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3284                         }
3285
3286                         /*
3287                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3288                          * Win2K needs this to get the inheritance correct when replacing ACLs
3289                          * on a directory tree. Based on work by Jim @ IBM.
3290                          */
3291
3292                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3293
3294                         if (lp_profile_acls(SNUM(conn))) {
3295                                 for (i = 0; i < num_aces; i++) {
3296                                         if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3297                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3298                                                                    &orig_owner_sid,
3299                                                                    nt_ace_list[i].type,
3300                                                                    nt_ace_list[i].access_mask,
3301                                                                    nt_ace_list[i].flags);
3302                                                 break;
3303                                         }
3304                                 }
3305                         }
3306                 }
3307
3308                 if (num_aces) {
3309                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3310                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3311                                 goto done;
3312                         }
3313                 }
3314         } /* security_info & DACL_SECURITY_INFORMATION */
3315
3316         psd = make_standard_sec_desc( talloc_tos(),
3317                         (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3318                         (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3319                         psa,
3320                         &sd_size);
3321
3322         if(!psd) {
3323                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3324                 sd_size = 0;
3325                 goto done;
3326         }
3327
3328         /*
3329          * Windows 2000: The DACL_PROTECTED flag in the security
3330          * descriptor marks the ACL as non-inheriting, i.e., no
3331          * ACEs from higher level directories propagate to this
3332          * ACL. In the POSIX ACL model permissions are only
3333          * inherited at file create time, so ACLs never contain
3334          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3335          * flag doesn't seem to bother Windows NT.
3336          * Always set this if map acl inherit is turned off.
3337          */
3338         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3339                 psd->type |= SEC_DESC_DACL_PROTECTED;
3340         } else {
3341                 psd->type |= pal->sd_type;
3342         }
3343
3344         if (psd->dacl) {
3345                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3346         }
3347
3348         *ppdesc = psd;
3349
3350  done:
3351
3352         if (posix_acl) {
3353                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3354         }
3355         if (def_acl) {
3356                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3357         }
3358         free_canon_ace_list(file_ace);
3359         free_canon_ace_list(dir_ace);
3360         free_inherited_info(pal);
3361         SAFE_FREE(nt_ace_list);
3362
3363         return NT_STATUS_OK;
3364 }
3365
3366 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3367                            SEC_DESC **ppdesc)
3368 {
3369         SMB_STRUCT_STAT sbuf;
3370         SMB_ACL_T posix_acl = NULL;
3371         struct pai_val *pal;
3372
3373         *ppdesc = NULL;
3374
3375         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3376                   fsp_str_dbg(fsp)));
3377
3378         /* can it happen that fsp_name == NULL ? */
3379         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3380                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3381                                         security_info, ppdesc);
3382         }
3383
3384         /* Get the stat struct for the owner info. */
3385         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3386                 return map_nt_error_from_unix(errno);
3387         }
3388
3389         /* Get the ACL from the fd. */
3390         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3391
3392         pal = fload_inherited_info(fsp);
3393
3394         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3395                                        &sbuf, pal, posix_acl, NULL,
3396                                        security_info, ppdesc);
3397 }
3398
3399 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3400                           uint32_t security_info, SEC_DESC **ppdesc)
3401 {
3402         SMB_ACL_T posix_acl = NULL;
3403         SMB_ACL_T def_acl = NULL;
3404         struct pai_val *pal;
3405         struct smb_filename smb_fname;
3406         int ret;
3407
3408         *ppdesc = NULL;
3409
3410         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3411
3412         ZERO_STRUCT(smb_fname);
3413         smb_fname.base_name = discard_const_p(char, name);
3414
3415         /* Get the stat struct for the owner info. */
3416         if (lp_posix_pathnames()) {
3417                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3418         } else {
3419                 ret = SMB_VFS_STAT(conn, &smb_fname);
3420         }
3421
3422         if (ret == -1) {
3423                 return map_nt_error_from_unix(errno);
3424         }
3425
3426         /* Get the ACL from the path. */
3427         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3428
3429         /* If it's a directory get the default POSIX ACL. */
3430         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3431                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3432                 def_acl = free_empty_sys_acl(conn, def_acl);
3433         }
3434
3435         pal = load_inherited_info(conn, name);
3436
3437         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3438                                        posix_acl, def_acl, security_info,
3439                                        ppdesc);
3440 }
3441
3442 /****************************************************************************
3443  Try to chown a file. We will be able to chown it under the following conditions.
3444
3445   1) If we have root privileges, then it will just work.
3446   2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3447   3) If we have SeRestorePrivilege we can change the user to any other user.
3448   4) If we have write permission to the file and dos_filemodes is set
3449      then allow chown to the currently authenticated user.
3450 ****************************************************************************/
3451
3452 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3453               uid_t uid, gid_t gid)
3454 {
3455         int ret;
3456         files_struct *fsp;
3457
3458         if(!CAN_WRITE(conn)) {
3459                 return -1;
3460         }
3461
3462         /* Case (1). */
3463         /* try the direct way first */
3464         if (lp_posix_pathnames()) {
3465                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3466         } else {
3467                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3468         }
3469
3470         if (ret == 0)
3471                 return 0;
3472
3473         /* Case (2) / (3) */
3474         if (lp_enable_privileges()) {
3475
3476                 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3477                                                               &se_take_ownership);
3478                 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3479                                                        &se_restore);
3480
3481                 /* Case (2) */
3482                 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3483                 /* Case (3) */
3484                      ( has_restore_priv ) ) {
3485
3486                         become_root();
3487                         /* Keep the current file gid the same - take ownership doesn't imply group change. */
3488                         if (lp_posix_pathnames()) {
3489                                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3490                                                     (gid_t)-1);
3491                         } else {
3492                                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3493                                                     (gid_t)-1);
3494                         }
3495                         unbecome_root();
3496                         return ret;
3497                 }
3498         }
3499
3500         /* Case (4). */
3501         if (!lp_dos_filemode(SNUM(conn))) {
3502                 errno = EPERM;
3503                 return -1;
3504         }
3505
3506         /* only allow chown to the current user. This is more secure,
3507            and also copes with the case where the SID in a take ownership ACL is
3508            a local SID on the users workstation
3509         */
3510         if (uid != current_user.ut.uid) {
3511                 errno = EPERM;
3512                 return -1;
3513         }
3514
3515         if (lp_posix_pathnames()) {
3516                 ret = SMB_VFS_LSTAT(conn, smb_fname);
3517         } else {
3518                 ret = SMB_VFS_STAT(conn, smb_fname);
3519         }
3520
3521         if (ret == -1) {
3522                 return -1;
3523         }
3524
3525         if (!NT_STATUS_IS_OK(open_file_fchmod(conn, smb_fname, &fsp))) {
3526                 return -1;
3527         }
3528
3529         become_root();
3530         /* Keep the current file gid the same. */
3531         if (fsp->fh->fd == -1) {
3532                 if (lp_posix_pathnames()) {
3533                         ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3534                                             (gid_t)-1);
3535                 } else {
3536                         ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3537                                             (gid_t)-1);
3538                 }
3539         } else {
3540                 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3541         }
3542         unbecome_root();
3543
3544         close_file(NULL, fsp, NORMAL_CLOSE);
3545
3546         return ret;
3547 }
3548
3549 #if 0
3550 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3551
3552 /****************************************************************************
3553  Take care of parent ACL inheritance.
3554 ****************************************************************************/
3555
3556 NTSTATUS append_parent_acl(files_struct *fsp,
3557                                 const SEC_DESC *pcsd,
3558                                 SEC_DESC **pp_new_sd)
3559 {
3560         struct smb_filename *smb_dname = NULL;
3561         SEC_DESC *parent_sd = NULL;
3562         files_struct *parent_fsp = NULL;
3563         TALLOC_CTX *mem_ctx = talloc_tos();
3564         char *parent_name = NULL;
3565         SEC_ACE *new_ace = NULL;
3566         unsigned int num_aces = pcsd->dacl->num_aces;
3567         NTSTATUS status;
3568         int info;
3569         unsigned int i, j;
3570         SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3571         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3572
3573         if (psd == NULL) {
3574                 return NT_STATUS_NO_MEMORY;
3575         }
3576
3577         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3578                             NULL)) {
3579                 return NT_STATUS_NO_MEMORY;
3580         }
3581
3582         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3583                                             &smb_dname);
3584         if (!NT_STATUS_IS_OK(status)) {
3585                 goto fail;
3586         }
3587
3588         status = SMB_VFS_CREATE_FILE(
3589                 fsp->conn,                              /* conn */
3590                 NULL,                                   /* req */
3591                 0,                                      /* root_dir_fid */
3592                 smb_dname,                              /* fname */
3593                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3594                 FILE_SHARE_NONE,                        /* share_access */
3595                 FILE_OPEN,                              /* create_disposition*/
3596                 FILE_DIRECTORY_FILE,                    /* create_options */
3597                 0,                                      /* file_attributes */
3598                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3599                 0,                                      /* allocation_size */
3600                 NULL,                                   /* sd */
3601                 NULL,                                   /* ea_list */
3602                 &parent_fsp,                            /* result */
3603                 &info);                                 /* pinfo */
3604
3605         if (!NT_STATUS_IS_OK(status)) {
3606                 TALLOC_FREE(smb_dname);
3607                 return status;
3608         }
3609
3610         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3611                                     DACL_SECURITY_INFORMATION, &parent_sd );
3612
3613         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3614         TALLOC_FREE(smb_dname);
3615
3616         if (!NT_STATUS_IS_OK(status)) {
3617                 return status;
3618         }
3619
3620         /*
3621          * Make room for potentially all the ACLs from
3622          * the parent. We used to add the ugw triple here,
3623          * as we knew we were dealing with POSIX ACLs.
3624          * We no longer need to do so as we can guarentee
3625          * that a default ACL from the parent directory will
3626          * be well formed for POSIX ACLs if it came from a
3627          * POSIX ACL source, and if we're not writing to a
3628          * POSIX ACL sink then we don't care if it's not well
3629          * formed. JRA.
3630          */
3631
3632         num_aces += parent_sd->dacl->num_aces;
3633
3634         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3635                                         num_aces)) == NULL) {
3636                 return NT_STATUS_NO_MEMORY;
3637         }
3638
3639         /* Start by copying in all the given ACE entries. */
3640         for (i = 0; i < psd->dacl->num_aces; i++) {
3641                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3642         }
3643
3644         /*
3645          * Note that we're ignoring "inherit permissions" here
3646          * as that really only applies to newly created files. JRA.
3647          */
3648
3649         /* Finally append any inherited ACEs. */
3650         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3651                 SEC_ACE *se = &parent_sd->dacl->aces[j];
3652
3653                 if (fsp->is_directory) {
3654                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3655                                 /* Doesn't apply to a directory - ignore. */
3656                                 DEBUG(10,("append_parent_acl: directory %s "
3657                                         "ignoring non container "
3658                                         "inherit flags %u on ACE with sid %s "
3659                                         "from parent %s\n",
3660                                         fsp_str_dbg(fsp),
3661                                         (unsigned int)se->flags,
3662                                         sid_string_dbg(&se->trustee),
3663                                         parent_name));
3664                                 continue;
3665                         }
3666                 } else {
3667                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3668                                 /* Doesn't apply to a file - ignore. */
3669                                 DEBUG(10,("append_parent_acl: file %s "
3670                                         "ignoring non object "
3671                                         "inherit flags %u on ACE with sid %s "
3672                                         "from parent %s\n",
3673                                         fsp_str_dbg(fsp),
3674                                         (unsigned int)se->flags,
3675                                         sid_string_dbg(&se->trustee),
3676                                         parent_name));
3677                                 continue;
3678                         }
3679                 }
3680
3681                 if (is_dacl_protected) {
3682                         /* If the DACL is protected it means we must
3683                          * not overwrite an existing ACE entry with the
3684                          * same SID. This is order N^2. Ouch :-(. JRA. */
3685                         unsigned int k;
3686                         for (k = 0; k < psd->dacl->num_aces; k++) {
3687                                 if (sid_equal(&psd->dacl->aces[k].trustee,
3688                                                 &se->trustee)) {
3689                                         break;
3690                                 }
3691                         }
3692                         if (k < psd->dacl->num_aces) {
3693                                 /* SID matched. Ignore. */
3694                                 DEBUG(10,("append_parent_acl: path %s "
3695                                         "ignoring ACE with protected sid %s "
3696                                         "from parent %s\n",
3697                                         fsp_str_dbg(fsp),
3698                                         sid_string_dbg(&se->trustee),
3699                                         parent_name));
3700                                 continue;
3701                         }
3702                 }
3703
3704                 sec_ace_copy(&new_ace[i], se);
3705                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3706                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3707                 }
3708                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3709
3710                 if (fsp->is_directory) {
3711                         /*
3712                          * Strip off any inherit only. It's applied.
3713                          */
3714                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3715                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3716                                 /* No further inheritance. */
3717                                 new_ace[i].flags &=
3718                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3719                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3720                         }
3721                 } else {
3722                         /*
3723                          * Strip off any container or inherit
3724                          * flags, they can't apply to objects.
3725                          */
3726                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3727                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3728                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3729                 }
3730                 i++;
3731
3732                 DEBUG(10,("append_parent_acl: path %s "
3733                         "inheriting ACE with sid %s "
3734                         "from parent %s\n",
3735                         fsp_str_dbg(fsp),
3736                         sid_string_dbg(&se->trustee),
3737                         parent_name));
3738         }
3739
3740         psd->dacl->aces = new_ace;
3741         psd->dacl->num_aces = i;
3742         psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3743                          SE_DESC_DACL_AUTO_INHERIT_REQ);
3744
3745         *pp_new_sd = psd;
3746         return status;
3747 }
3748 #endif
3749
3750 /****************************************************************************
3751  Reply to set a security descriptor on an fsp. security_info_sent is the
3752  description of the following NT ACL.
3753  This should be the only external function needed for the UNIX style set ACL.
3754 ****************************************************************************/
3755
3756 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd_orig)
3757 {
3758         connection_struct *conn = fsp->conn;
3759         uid_t user = (uid_t)-1;
3760         gid_t grp = (gid_t)-1;
3761         DOM_SID file_owner_sid;
3762         DOM_SID file_grp_sid;
3763         canon_ace *file_ace_list = NULL;
3764         canon_ace *dir_ace_list = NULL;
3765         bool acl_perms = False;
3766         mode_t orig_mode = (mode_t)0;
3767         NTSTATUS status;
3768         bool set_acl_as_root = false;
3769         bool acl_set_support = false;
3770         bool ret = false;
3771         SEC_DESC *psd = NULL;
3772
3773         DEBUG(10,("set_nt_acl: called for file %s\n",
3774                   fsp_str_dbg(fsp)));
3775
3776         if (!CAN_WRITE(conn)) {
3777                 DEBUG(10,("set acl rejected on read-only share\n"));
3778                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3779         }
3780
3781         if (!psd_orig) {
3782                 return NT_STATUS_INVALID_PARAMETER;
3783         }
3784
3785         psd = dup_sec_desc(talloc_tos(), psd_orig);
3786         if (!psd) {
3787                 return NT_STATUS_NO_MEMORY;
3788         }
3789
3790         /*
3791          * Get the current state of the file.
3792          */
3793
3794         status = vfs_stat_fsp(fsp);
3795         if (!NT_STATUS_IS_OK(status)) {
3796                 return status;
3797         }
3798
3799         /* Save the original element we check against. */
3800         orig_mode = fsp->fsp_name->st.st_ex_mode;
3801
3802         /*
3803          * Unpack the user/group/world id's.
3804          */
3805
3806         /* POSIX can't cope with missing owner/group. */
3807         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3808                 security_info_sent &= ~SECINFO_OWNER;
3809         }
3810         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3811                 security_info_sent &= ~SECINFO_GROUP;
3812         }
3813
3814         status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3815         if (!NT_STATUS_IS_OK(status)) {
3816                 return status;
3817         }
3818
3819         /*
3820          * Do we need to chown ? If so this must be done first as the incoming
3821          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3822          * Noticed by Simo.
3823          */
3824
3825         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3826             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3827
3828                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3829                          fsp_str_dbg(fsp), (unsigned int)user,
3830                          (unsigned int)grp));
3831
3832                 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3833                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3834                                  "= %s.\n", fsp_str_dbg(fsp),
3835                                  (unsigned int)user, (unsigned int)grp,
3836                                  strerror(errno)));
3837                         if (errno == EPERM) {
3838                                 return NT_STATUS_INVALID_OWNER;
3839                         }
3840                         return map_nt_error_from_unix(errno);
3841                 }
3842
3843                 /*
3844                  * Recheck the current state of the file, which may have changed.
3845                  * (suid/sgid bits, for instance)
3846                  */
3847
3848                 status = vfs_stat_fsp(fsp);
3849                 if (!NT_STATUS_IS_OK(status)) {
3850                         return status;
3851                 }
3852
3853                 /* Save the original element we check against. */
3854                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3855
3856                 /* If we successfully chowned, we know we must
3857                  * be able to set the acl, so do it as root.
3858                  */
3859                 set_acl_as_root = true;
3860         }
3861
3862         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3863
3864         if((security_info_sent & SECINFO_DACL) &&
3865                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3866                         (psd->dacl == NULL)) {
3867                 SEC_ACE ace[3];
3868
3869                 /* We can't have NULL DACL in POSIX.
3870                    Use owner/group/Everyone -> full access. */
3871
3872                 init_sec_ace(&ace[0],
3873                                 &file_owner_sid,
3874                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3875                                 GENERIC_ALL_ACCESS,
3876                                 0);
3877                 init_sec_ace(&ace[1],
3878                                 &file_grp_sid,
3879                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3880                                 GENERIC_ALL_ACCESS,
3881                                 0);
3882                 init_sec_ace(&ace[2],
3883                                 &global_sid_World,
3884                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3885                                 GENERIC_ALL_ACCESS,
3886                                 0);
3887                 psd->dacl = make_sec_acl(talloc_tos(),
3888                                         NT4_ACL_REVISION,
3889                                         3,
3890                                         ace);
3891                 if (psd->dacl == NULL) {
3892                         return NT_STATUS_NO_MEMORY;
3893                 }
3894                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3895         }
3896
3897         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3898                                      &file_grp_sid, &file_ace_list,
3899                                      &dir_ace_list, security_info_sent, psd);
3900
3901         /* Ignore W2K traverse DACL set. */
3902         if (!file_ace_list && !dir_ace_list) {
3903                 return NT_STATUS_OK;
3904         }
3905
3906         if (!acl_perms) {
3907                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3908                 free_canon_ace_list(file_ace_list);
3909                 free_canon_ace_list(dir_ace_list);
3910                 return NT_STATUS_ACCESS_DENIED;
3911         }
3912
3913         /*
3914          * Only change security if we got a DACL.
3915          */
3916
3917         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3918                 free_canon_ace_list(file_ace_list);
3919                 free_canon_ace_list(dir_ace_list);
3920                 return NT_STATUS_OK;
3921         }
3922
3923         /*
3924          * Try using the POSIX ACL set first. Fall back to chmod if
3925          * we have no ACL support on this filesystem.
3926          */
3927
3928         if (acl_perms && file_ace_list) {
3929                 if (set_acl_as_root) {
3930                         become_root();
3931                 }
3932                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3933                                          &fsp->fsp_name->st, &acl_set_support);
3934                 if (set_acl_as_root) {
3935                         unbecome_root();
3936                 }
3937                 if (acl_set_support && ret == false) {
3938                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3939                                  "%s (%s).\n", fsp_str_dbg(fsp),
3940                                  strerror(errno)));
3941                         free_canon_ace_list(file_ace_list);
3942                         free_canon_ace_list(dir_ace_list);
3943                         return map_nt_error_from_unix(errno);
3944                 }
3945         }
3946
3947         if (acl_perms && acl_set_support && fsp->is_directory) {
3948                 if (dir_ace_list) {
3949                         if (set_acl_as_root) {
3950                                 become_root();
3951                         }
3952                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
3953                                                  &fsp->fsp_name->st,
3954                                                  &acl_set_support);
3955                         if (set_acl_as_root) {
3956                                 unbecome_root();
3957                         }
3958                         if (ret == false) {
3959                                 DEBUG(3,("set_nt_acl: failed to set default "
3960                                          "acl on directory %s (%s).\n",
3961                                          fsp_str_dbg(fsp), strerror(errno)));
3962                                 free_canon_ace_list(file_ace_list);
3963                                 free_canon_ace_list(dir_ace_list);
3964                                 return map_nt_error_from_unix(errno);
3965                         }
3966                 } else {
3967                         int sret = -1;
3968
3969                         /*
3970                          * No default ACL - delete one if it exists.
3971                          */
3972
3973                         if (set_acl_as_root) {
3974                                 become_root();
3975                         }
3976                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3977                             fsp->fsp_name->base_name);
3978                         if (set_acl_as_root) {
3979                                 unbecome_root();
3980                         }
3981                         if (sret == -1) {
3982                                 if (acl_group_override(conn, fsp->fsp_name)) {
3983                                         DEBUG(5,("set_nt_acl: acl group "
3984                                                  "control on and current user "
3985                                                  "in file %s primary group. "
3986                                                  "Override delete_def_acl\n",
3987                                                  fsp_str_dbg(fsp)));
3988
3989                                         become_root();
3990                                         sret =
3991                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3992                                                     conn,
3993                                                     fsp->fsp_name->base_name);
3994                                         unbecome_root();
3995                                 }
3996
3997                                 if (sret == -1) {
3998                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3999                                         free_canon_ace_list(file_ace_list);
4000                                         free_canon_ace_list(dir_ace_list);
4001                                         return map_nt_error_from_unix(errno);
4002                                 }
4003                         }
4004                 }
4005         }
4006
4007         if (acl_set_support) {
4008                 if (set_acl_as_root) {
4009                         become_root();
4010                 }
4011                 store_inheritance_attributes(fsp,
4012                                 file_ace_list,
4013                                 dir_ace_list,
4014                                 psd->type);
4015                 if (set_acl_as_root) {
4016                         unbecome_root();
4017                 }
4018         }
4019
4020         /*
4021          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4022          */
4023
4024         if(!acl_set_support && acl_perms) {
4025                 mode_t posix_perms;
4026
4027                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4028                         free_canon_ace_list(file_ace_list);
4029                         free_canon_ace_list(dir_ace_list);
4030                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4031                                  "posix permissions for file %s.\n",
4032                                  fsp_str_dbg(fsp)));
4033                         return NT_STATUS_ACCESS_DENIED;
4034                 }
4035
4036                 if (orig_mode != posix_perms) {
4037                         int sret = -1;
4038
4039                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4040                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4041
4042                         if (set_acl_as_root) {
4043                                 become_root();
4044                         }
4045                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4046                                              posix_perms);
4047                         if (set_acl_as_root) {
4048                                 unbecome_root();
4049                         }
4050                         if(sret == -1) {
4051                                 if (acl_group_override(conn, fsp->fsp_name)) {
4052                                         DEBUG(5,("set_nt_acl: acl group "
4053                                                  "control on and current user "
4054                                                  "in file %s primary group. "
4055                                                  "Override chmod\n",
4056                                                  fsp_str_dbg(fsp)));
4057
4058                                         become_root();
4059                                         sret = SMB_VFS_CHMOD(conn,
4060                                             fsp->fsp_name->base_name,
4061                                             posix_perms);
4062                                         unbecome_root();
4063                                 }
4064
4065                                 if (sret == -1) {
4066                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4067                                                  "failed. Error = %s.\n",
4068                                                  fsp_str_dbg(fsp),
4069                                                  (unsigned int)posix_perms,
4070                                                  strerror(errno)));
4071                                         free_canon_ace_list(file_ace_list);
4072                                         free_canon_ace_list(dir_ace_list);
4073                                         return map_nt_error_from_unix(errno);
4074                                 }
4075                         }
4076                 }
4077         }
4078
4079         free_canon_ace_list(file_ace_list);
4080         free_canon_ace_list(dir_ace_list);
4081
4082         /* Ensure the stat struct in the fsp is correct. */
4083         status = vfs_stat_fsp(fsp);
4084
4085         return NT_STATUS_OK;
4086 }
4087
4088 /****************************************************************************
4089  Get the actual group bits stored on a file with an ACL. Has no effect if
4090  the file has no ACL. Needed in dosmode code where the stat() will return
4091  the mask bits, not the real group bits, for a file with an ACL.
4092 ****************************************************************************/
4093
4094 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4095 {
4096         int entry_id = SMB_ACL_FIRST_ENTRY;
4097         SMB_ACL_ENTRY_T entry;
4098         SMB_ACL_T posix_acl;
4099         int result = -1;
4100
4101         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4102         if (posix_acl == (SMB_ACL_T)NULL)
4103                 return -1;
4104
4105         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4106                 SMB_ACL_TAG_T tagtype;
4107                 SMB_ACL_PERMSET_T permset;
4108
4109                 entry_id = SMB_ACL_NEXT_ENTRY;
4110
4111                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4112                         break;
4113
4114                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4115                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4116                                 break;
4117                         } else {
4118                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4119                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4120                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4121                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4122                                 result = 0;
4123                                 break;
4124                         }
4125                 }
4126         }
4127         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4128         return result;
4129 }
4130
4131 /****************************************************************************
4132  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4133  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4134 ****************************************************************************/
4135
4136 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4137 {
4138         int entry_id = SMB_ACL_FIRST_ENTRY;
4139         SMB_ACL_ENTRY_T entry;
4140         int num_entries = 0;
4141
4142         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4143                 SMB_ACL_TAG_T tagtype;
4144                 SMB_ACL_PERMSET_T permset;
4145                 mode_t perms;
4146
4147                 entry_id = SMB_ACL_NEXT_ENTRY;
4148
4149                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4150                         return -1;
4151
4152                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4153                         return -1;
4154
4155                 num_entries++;
4156
4157                 switch(tagtype) {
4158                         case SMB_ACL_USER_OBJ:
4159                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4160                                 break;
4161                         case SMB_ACL_GROUP_OBJ:
4162                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4163                                 break;
4164                         case SMB_ACL_MASK:
4165                                 /*
4166                                  * FIXME: The ACL_MASK entry permissions should really be set to
4167                                  * the union of the permissions of all ACL_USER,
4168                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4169                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4170                                  */
4171                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4172                                 break;
4173                         case SMB_ACL_OTHER:
4174                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4175                                 break;
4176                         default:
4177                                 continue;
4178                 }
4179
4180                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4181                         return -1;
4182
4183                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4184                         return -1;
4185         }
4186
4187         /*
4188          * If this is a simple 3 element ACL or no elements then it's a standard
4189          * UNIX permission set. Just use chmod...
4190          */
4191
4192         if ((num_entries == 3) || (num_entries == 0))
4193                 return -1;
4194
4195         return 0;
4196 }
4197
4198 /****************************************************************************
4199  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4200  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4201  resulting ACL on TO.  Note that name is in UNIX character set.
4202 ****************************************************************************/
4203
4204 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4205 {
4206         SMB_ACL_T posix_acl = NULL;
4207         int ret = -1;
4208
4209         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4210                 return -1;
4211
4212         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4213                 goto done;
4214
4215         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4216
4217  done:
4218
4219         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4220         return ret;
4221 }
4222
4223 /****************************************************************************
4224  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4225  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4226  Note that name is in UNIX character set.
4227 ****************************************************************************/
4228
4229 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4230 {
4231         return copy_access_posix_acl(conn, name, name, mode);
4232 }
4233
4234 /****************************************************************************
4235  Check for an existing default POSIX ACL on a directory.
4236 ****************************************************************************/
4237
4238 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4239 {
4240         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4241         bool has_acl = False;
4242         SMB_ACL_ENTRY_T entry;
4243
4244         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4245                 has_acl = True;
4246         }
4247
4248         if (def_acl) {
4249                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4250         }
4251         return has_acl;
4252 }
4253
4254 /****************************************************************************
4255  If the parent directory has no default ACL but it does have an Access ACL,
4256  inherit this Access ACL to file name.
4257 ****************************************************************************/
4258
4259 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4260                        const char *name, mode_t mode)
4261 {
4262         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4263                 return 0;
4264
4265         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4266 }
4267
4268 /****************************************************************************
4269  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4270  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4271 ****************************************************************************/
4272
4273 int fchmod_acl(files_struct *fsp, mode_t mode)
4274 {
4275         connection_struct *conn = fsp->conn;
4276         SMB_ACL_T posix_acl = NULL;
4277         int ret = -1;
4278
4279         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4280                 return -1;
4281
4282         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4283                 goto done;
4284
4285         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4286
4287   done:
4288
4289         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4290         return ret;
4291 }
4292
4293 /****************************************************************************
4294  Map from wire type to permset.
4295 ****************************************************************************/
4296
4297 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4298 {
4299         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4300                 return False;
4301         }
4302
4303         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4304                 return False;
4305         }
4306
4307         if (wire_perm & SMB_POSIX_ACL_READ) {
4308                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4309                         return False;
4310                 }
4311         }
4312         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4313                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4314                         return False;
4315                 }
4316         }
4317         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4318                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4319                         return False;
4320                 }
4321         }
4322         return True;
4323 }
4324
4325 /****************************************************************************
4326  Map from wire type to tagtype.
4327 ****************************************************************************/
4328
4329 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4330 {
4331         switch (wire_tt) {
4332                 case SMB_POSIX_ACL_USER_OBJ:
4333                         *p_tt = SMB_ACL_USER_OBJ;
4334                         break;
4335                 case SMB_POSIX_ACL_USER:
4336                         *p_tt = SMB_ACL_USER;
4337                         break;
4338                 case SMB_POSIX_ACL_GROUP_OBJ:
4339                         *p_tt = SMB_ACL_GROUP_OBJ;
4340                         break;
4341                 case SMB_POSIX_ACL_GROUP:
4342                         *p_tt = SMB_ACL_GROUP;
4343                         break;
4344                 case SMB_POSIX_ACL_MASK:
4345                         *p_tt = SMB_ACL_MASK;
4346                         break;
4347                 case SMB_POSIX_ACL_OTHER:
4348                         *p_tt = SMB_ACL_OTHER;
4349                         break;
4350                 default:
4351                         return False;
4352         }
4353         return True;
4354 }
4355
4356 /****************************************************************************
4357  Create a new POSIX acl from wire permissions.
4358  FIXME ! How does the share mask/mode fit into this.... ?
4359 ****************************************************************************/
4360
4361 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4362 {
4363         unsigned int i;
4364         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4365
4366         if (the_acl == NULL) {
4367                 return NULL;
4368         }
4369
4370         for (i = 0; i < num_acls; i++) {
4371                 SMB_ACL_ENTRY_T the_entry;
4372                 SMB_ACL_PERMSET_T the_permset;
4373                 SMB_ACL_TAG_T tag_type;
4374
4375                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4376                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4377                                 i, strerror(errno) ));
4378                         goto fail;
4379                 }
4380
4381                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4382                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4383                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4384                         goto fail;
4385                 }
4386
4387                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4388                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4389                                 i, strerror(errno) ));
4390                         goto fail;
4391                 }
4392
4393                 /* Get the permset pointer from the new ACL entry. */
4394                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4395                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4396                                 i, strerror(errno) ));
4397                         goto fail;
4398                 }
4399
4400                 /* Map from wire to permissions. */
4401                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4402                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4403                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4404                         goto fail;
4405                 }
4406
4407                 /* Now apply to the new ACL entry. */
4408                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4409                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4410                                 i, strerror(errno) ));
4411                         goto fail;
4412                 }
4413
4414                 if (tag_type == SMB_ACL_USER) {
4415                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4416                         uid_t uid = (uid_t)uidval;
4417                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4418                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4419                                         (unsigned int)uid, i, strerror(errno) ));
4420                                 goto fail;
4421                         }
4422                 }
4423
4424                 if (tag_type == SMB_ACL_GROUP) {
4425                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4426                         gid_t gid = (uid_t)gidval;
4427                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4428                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4429                                         (unsigned int)gid, i, strerror(errno) ));
4430                                 goto fail;
4431                         }
4432                 }
4433         }
4434
4435         return the_acl;
4436
4437  fail:
4438
4439         if (the_acl != NULL) {
4440                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4441         }
4442         return NULL;
4443 }
4444
4445 /****************************************************************************
4446  Calls from UNIX extensions - Default POSIX ACL set.
4447  If num_def_acls == 0 and not a directory just return. If it is a directory
4448  and num_def_acls == 0 then remove the default acl. Else set the default acl
4449  on the directory.
4450 ****************************************************************************/
4451
4452 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4453                                 uint16 num_def_acls, const char *pdata)
4454 {
4455         SMB_ACL_T def_acl = NULL;
4456
4457         if (!S_ISDIR(psbuf->st_ex_mode)) {
4458                 if (num_def_acls) {
4459                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4460                         errno = EISDIR;
4461                         return False;
4462                 } else {
4463                         return True;
4464                 }
4465         }
4466
4467         if (!num_def_acls) {
4468                 /* Remove the default ACL. */
4469                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4470                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4471                                 fname, strerror(errno) ));
4472                         return False;
4473                 }
4474                 return True;
4475         }
4476
4477         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4478                 return False;
4479         }
4480
4481         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4482                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4483                         fname, strerror(errno) ));
4484                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4485                 return False;
4486         }
4487
4488         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4489         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4490         return True;
4491 }
4492
4493 /****************************************************************************
4494  Remove an ACL from a file. As we don't have acl_delete_entry() available
4495  we must read the current acl and copy all entries except MASK, USER and GROUP
4496  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4497  removed.
4498  FIXME ! How does the share mask/mode fit into this.... ?
4499 ****************************************************************************/
4500
4501 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4502 {
4503         SMB_ACL_T file_acl = NULL;
4504         int entry_id = SMB_ACL_FIRST_ENTRY;
4505         SMB_ACL_ENTRY_T entry;
4506         bool ret = False;
4507         /* Create a new ACL with only 3 entries, u/g/w. */
4508         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4509         SMB_ACL_ENTRY_T user_ent = NULL;
4510         SMB_ACL_ENTRY_T group_ent = NULL;
4511         SMB_ACL_ENTRY_T other_ent = NULL;
4512
4513         if (new_file_acl == NULL) {
4514                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4515                 return False;
4516         }
4517
4518         /* Now create the u/g/w entries. */
4519         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4520                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4521                         fname, strerror(errno) ));
4522                 goto done;
4523         }
4524         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4525                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4526                         fname, strerror(errno) ));
4527                 goto done;
4528         }
4529
4530         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4531                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4532                         fname, strerror(errno) ));
4533                 goto done;
4534         }
4535         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4536                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4537                         fname, strerror(errno) ));
4538                 goto done;
4539         }
4540
4541         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4542                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4543                         fname, strerror(errno) ));
4544                 goto done;
4545         }
4546         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4547                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4548                         fname, strerror(errno) ));
4549                 goto done;
4550         }
4551
4552         /* Get the current file ACL. */
4553         if (fsp && fsp->fh->fd != -1) {
4554                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4555         } else {
4556                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4557         }
4558
4559         if (file_acl == NULL) {
4560                 /* This is only returned if an error occurred. Even for a file with
4561                    no acl a u/g/w acl should be returned. */
4562                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4563                         fname, strerror(errno) ));
4564                 goto done;
4565         }
4566
4567         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4568                 SMB_ACL_TAG_T tagtype;
4569                 SMB_ACL_PERMSET_T permset;
4570
4571                 entry_id = SMB_ACL_NEXT_ENTRY;
4572
4573                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4574                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4575                                 fname, strerror(errno) ));
4576                         goto done;
4577                 }
4578
4579                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4580                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4581                                 fname, strerror(errno) ));
4582                         goto done;
4583                 }
4584
4585                 if (tagtype == SMB_ACL_USER_OBJ) {
4586                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4587                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4588                                         fname, strerror(errno) ));
4589                         }
4590                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4591                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4592                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4593                                         fname, strerror(errno) ));
4594                         }
4595                 } else if (tagtype == SMB_ACL_OTHER) {
4596                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4597                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4598                                         fname, strerror(errno) ));
4599                         }
4600                 }
4601         }
4602
4603         /* Set the new empty file ACL. */
4604         if (fsp && fsp->fh->fd != -1) {
4605                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4606                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4607                                 fname, strerror(errno) ));
4608                         goto done;
4609                 }
4610         } else {
4611                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4612                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4613                                 fname, strerror(errno) ));
4614                         goto done;
4615                 }
4616         }
4617
4618         ret = True;
4619
4620  done:
4621
4622         if (file_acl) {
4623                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4624         }
4625         if (new_file_acl) {
4626                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4627         }
4628         return ret;
4629 }
4630
4631 /****************************************************************************
4632  Calls from UNIX extensions - POSIX ACL set.
4633  If num_def_acls == 0 then read/modify/write acl after removing all entries
4634  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4635 ****************************************************************************/
4636
4637 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4638 {
4639         SMB_ACL_T file_acl = NULL;
4640
4641         if (!num_acls) {
4642                 /* Remove the ACL from the file. */
4643                 return remove_posix_acl(conn, fsp, fname);
4644         }
4645
4646         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4647                 return False;
4648         }
4649
4650         if (fsp && fsp->fh->fd != -1) {
4651                 /* The preferred way - use an open fd. */
4652                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4653                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4654                                 fname, strerror(errno) ));
4655                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4656                         return False;
4657                 }
4658         } else {
4659                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4660                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4661                                 fname, strerror(errno) ));
4662                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4663                         return False;
4664                 }
4665         }
4666
4667         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4668         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4669         return True;
4670 }
4671
4672 /********************************************************************
4673  Pull the NT ACL from a file on disk or the OpenEventlog() access
4674  check.  Caller is responsible for freeing the returned security
4675  descriptor via TALLOC_FREE().  This is designed for dealing with
4676  user space access checks in smbd outside of the VFS.  For example,
4677  checking access rights in OpenEventlog().
4678
4679  Assume we are dealing with files (for now)
4680 ********************************************************************/
4681
4682 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4683 {
4684         SEC_DESC *psd, *ret_sd;
4685         connection_struct *conn;
4686         files_struct finfo;
4687         struct fd_handle fh;
4688         NTSTATUS status;
4689
4690         conn = TALLOC_ZERO_P(ctx, connection_struct);
4691         if (conn == NULL) {
4692                 DEBUG(0, ("talloc failed\n"));
4693                 return NULL;
4694         }
4695
4696         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4697                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4698                 TALLOC_FREE(conn);
4699                 return NULL;
4700         }
4701
4702         conn->params->service = -1;
4703
4704         set_conn_connectpath(conn, "/");
4705
4706         if (!smbd_vfs_init(conn)) {
4707                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4708                 conn_free(conn);
4709                 return NULL;
4710         }
4711
4712         ZERO_STRUCT( finfo );
4713         ZERO_STRUCT( fh );
4714
4715         finfo.fnum = -1;
4716         finfo.conn = conn;
4717         finfo.fh = &fh;
4718         finfo.fh->fd = -1;
4719
4720         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4721                                             &finfo.fsp_name);
4722         if (!NT_STATUS_IS_OK(status)) {
4723                 conn_free(conn);
4724                 return NULL;
4725         }
4726
4727         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4728                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4729                 TALLOC_FREE(finfo.fsp_name);
4730                 conn_free(conn);
4731                 return NULL;
4732         }
4733
4734         ret_sd = dup_sec_desc( ctx, psd );
4735
4736         TALLOC_FREE(finfo.fsp_name);
4737         conn_free(conn);
4738
4739         return ret_sd;
4740 }
4741
4742 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4743
4744 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4745                                         const char *name,
4746                                         SMB_STRUCT_STAT *psbuf,
4747                                         SEC_DESC **ppdesc)
4748 {
4749         struct dom_sid owner_sid, group_sid;
4750         size_t size = 0;
4751         SEC_ACE aces[4];
4752         uint32_t access_mask = 0;
4753         mode_t mode = psbuf->st_ex_mode;
4754         SEC_ACL *new_dacl = NULL;
4755         int idx = 0;
4756
4757         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4758                 name, (int)mode ));
4759
4760         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4761         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4762
4763         /*
4764          We provide up to 4 ACEs
4765                 - Owner
4766                 - Group
4767                 - Everyone
4768                 - NT System
4769         */
4770
4771         if (mode & S_IRUSR) {
4772                 if (mode & S_IWUSR) {
4773                         access_mask |= SEC_RIGHTS_FILE_ALL;
4774                 } else {
4775                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4776                 }
4777         }
4778         if (mode & S_IWUSR) {
4779                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4780         }
4781
4782         init_sec_ace(&aces[idx],
4783                         &owner_sid,
4784                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4785                         access_mask,
4786                         0);
4787         idx++;
4788
4789         access_mask = 0;
4790         if (mode & S_IRGRP) {
4791                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4792         }
4793         if (mode & S_IWGRP) {
4794                 /* note that delete is not granted - this matches posix behaviour */
4795                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4796         }
4797         if (access_mask) {
4798                 init_sec_ace(&aces[idx],
4799                         &group_sid,
4800                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4801                         access_mask,
4802                         0);
4803                 idx++;
4804         }
4805
4806         access_mask = 0;
4807         if (mode & S_IROTH) {
4808                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4809         }
4810         if (mode & S_IWOTH) {
4811                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4812         }
4813         if (access_mask) {
4814                 init_sec_ace(&aces[idx],
4815                         &global_sid_World,
4816                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4817                         access_mask,
4818                         0);
4819                 idx++;
4820         }
4821
4822         init_sec_ace(&aces[idx],
4823                         &global_sid_System,
4824                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4825                         SEC_RIGHTS_FILE_ALL,
4826                         0);
4827         idx++;
4828
4829         new_dacl = make_sec_acl(ctx,
4830                         NT4_ACL_REVISION,
4831                         idx,
4832                         aces);
4833
4834         if (!new_dacl) {
4835                 return NT_STATUS_NO_MEMORY;
4836         }
4837
4838         *ppdesc = make_sec_desc(ctx,
4839                         SECURITY_DESCRIPTOR_REVISION_1,
4840                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4841                         &owner_sid,
4842                         &group_sid,
4843                         NULL,
4844                         new_dacl,
4845                         &size);
4846         if (!*ppdesc) {
4847                 return NT_STATUS_NO_MEMORY;
4848         }
4849         return NT_STATUS_OK;
4850 }