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                 } else if (pace->type == SMB_ACL_USER || pace->type == SMB_ACL_GROUP) {
1391
1392                         /*
1393                          * Ensure create mask/force create mode is respected on set.
1394                          */
1395
1396                         if (setting_acl && !is_default_acl) {
1397                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1398                         }
1399                 }
1400         }
1401
1402         if (!got_user) {
1403                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1404                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1405                         return False;
1406                 }
1407
1408                 ZERO_STRUCTP(pace);
1409                 pace->type = SMB_ACL_USER_OBJ;
1410                 pace->owner_type = UID_ACE;
1411                 pace->unix_ug.uid = pst->st_ex_uid;
1412                 pace->trustee = *pfile_owner_sid;
1413                 pace->attr = ALLOW_ACE;
1414                 /* Start with existing permissions, principle of least
1415                    surprises for the user. */
1416                 pace->perms = pst->st_ex_mode;
1417
1418                 if (setting_acl) {
1419                         /* See if the owning user is in any of the other groups in
1420                            the ACE, or if there's a matching user entry.
1421                            If so, OR in the permissions from that entry. */
1422
1423                         canon_ace *pace_iter;
1424
1425                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1426                                 if (pace_iter->type == SMB_ACL_USER &&
1427                                                 pace_iter->unix_ug.uid == pace->unix_ug.uid) {
1428                                         pace->perms |= pace_iter->perms;
1429                                 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1430                                         if (uid_entry_in_group(pace, pace_iter)) {
1431                                                 pace->perms |= pace_iter->perms;
1432                                         }
1433                                 }
1434                         }
1435
1436                         if (pace->perms == 0) {
1437                                 /* If we only got an "everyone" perm, just use that. */
1438                                 if (got_other)
1439                                         pace->perms = pace_other->perms;
1440                         }
1441
1442                         if (!is_default_acl) {
1443                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1444                         }
1445                 } else {
1446                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1447                 }
1448
1449                 DLIST_ADD(*pp_ace, pace);
1450         }
1451
1452         if (!got_grp) {
1453                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1454                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1455                         return False;
1456                 }
1457
1458                 ZERO_STRUCTP(pace);
1459                 pace->type = SMB_ACL_GROUP_OBJ;
1460                 pace->owner_type = GID_ACE;
1461                 pace->unix_ug.uid = pst->st_ex_gid;
1462                 pace->trustee = *pfile_grp_sid;
1463                 pace->attr = ALLOW_ACE;
1464                 if (setting_acl) {
1465                         /* If we only got an "everyone" perm, just use that. */
1466                         if (got_other)
1467                                 pace->perms = pace_other->perms;
1468                         else
1469                                 pace->perms = 0;
1470                         if (!is_default_acl) {
1471                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1472                         }
1473                 } else {
1474                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1475                 }
1476
1477                 DLIST_ADD(*pp_ace, pace);
1478         }
1479
1480         if (!got_other) {
1481                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1482                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1483                         return False;
1484                 }
1485
1486                 ZERO_STRUCTP(pace);
1487                 pace->type = SMB_ACL_OTHER;
1488                 pace->owner_type = WORLD_ACE;
1489                 pace->unix_ug.world = -1;
1490                 pace->trustee = global_sid_World;
1491                 pace->attr = ALLOW_ACE;
1492                 if (setting_acl) {
1493                         pace->perms = 0;
1494                         if (!is_default_acl) {
1495                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1496                         }
1497                 } else
1498                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1499
1500                 DLIST_ADD(*pp_ace, pace);
1501         }
1502
1503         return True;
1504 }
1505
1506 /****************************************************************************
1507  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1508  If it does not have them, check if there are any entries where the trustee is the
1509  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1510  Note we must not do this to default directory ACLs.
1511 ****************************************************************************/
1512
1513 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1514 {
1515         bool got_user_obj, got_group_obj;
1516         canon_ace *current_ace;
1517         int i, entries;
1518
1519         entries = count_canon_ace_list(ace);
1520         got_user_obj = False;
1521         got_group_obj = False;
1522
1523         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1524                 if (current_ace->type == SMB_ACL_USER_OBJ)
1525                         got_user_obj = True;
1526                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1527                         got_group_obj = True;
1528         }
1529         if (got_user_obj && got_group_obj) {
1530                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1531                 return;
1532         }
1533
1534         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1535                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1536                                 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1537                         current_ace->type = SMB_ACL_USER_OBJ;
1538                         got_user_obj = True;
1539                 }
1540                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1541                                 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1542                         current_ace->type = SMB_ACL_GROUP_OBJ;
1543                         got_group_obj = True;
1544                 }
1545         }
1546         if (!got_user_obj)
1547                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1548         if (!got_group_obj)
1549                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1550 }
1551
1552 /****************************************************************************
1553  Unpack a SEC_DESC into two canonical ace lists.
1554 ****************************************************************************/
1555
1556 static bool create_canon_ace_lists(files_struct *fsp,
1557                                         const SMB_STRUCT_STAT *pst,
1558                                         DOM_SID *pfile_owner_sid,
1559                                         DOM_SID *pfile_grp_sid,
1560                                         canon_ace **ppfile_ace,
1561                                         canon_ace **ppdir_ace,
1562                                         const SEC_ACL *dacl)
1563 {
1564         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1565         canon_ace *file_ace = NULL;
1566         canon_ace *dir_ace = NULL;
1567         canon_ace *current_ace = NULL;
1568         bool got_dir_allow = False;
1569         bool got_file_allow = False;
1570         int i, j;
1571
1572         *ppfile_ace = NULL;
1573         *ppdir_ace = NULL;
1574
1575         /*
1576          * Convert the incoming ACL into a more regular form.
1577          */
1578
1579         for(i = 0; i < dacl->num_aces; i++) {
1580                 SEC_ACE *psa = &dacl->aces[i];
1581
1582                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1583                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1584                         return False;
1585                 }
1586
1587                 if (nt4_compatible_acls()) {
1588                         /*
1589                          * The security mask may be UNIX_ACCESS_NONE which should map into
1590                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1591                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1592                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1593                          */
1594
1595                         /*
1596                          * Convert GENERIC bits to specific bits.
1597                          */
1598
1599                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1600
1601                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1602
1603                         if(psa->access_mask != UNIX_ACCESS_NONE)
1604                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1605                 }
1606         }
1607
1608         /*
1609          * Deal with the fact that NT 4.x re-writes the canonical format
1610          * that we return for default ACLs. If a directory ACE is identical
1611          * to a inherited directory ACE then NT changes the bits so that the
1612          * first ACE is set to OI|IO and the second ACE for this SID is set
1613          * to CI. We need to repair this. JRA.
1614          */
1615
1616         for(i = 0; i < dacl->num_aces; i++) {
1617                 SEC_ACE *psa1 = &dacl->aces[i];
1618
1619                 for (j = i + 1; j < dacl->num_aces; j++) {
1620                         SEC_ACE *psa2 = &dacl->aces[j];
1621
1622                         if (psa1->access_mask != psa2->access_mask)
1623                                 continue;
1624
1625                         if (!sid_equal(&psa1->trustee, &psa2->trustee))
1626                                 continue;
1627
1628                         /*
1629                          * Ok - permission bits and SIDs are equal.
1630                          * Check if flags were re-written.
1631                          */
1632
1633                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1634
1635                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1636                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1637
1638                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1639
1640                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1641                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1642
1643                         }
1644                 }
1645         }
1646
1647         for(i = 0; i < dacl->num_aces; i++) {
1648                 SEC_ACE *psa = &dacl->aces[i];
1649
1650                 /*
1651                  * Create a cannon_ace entry representing this NT DACL ACE.
1652                  */
1653
1654                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1655                         free_canon_ace_list(file_ace);
1656                         free_canon_ace_list(dir_ace);
1657                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1658                         return False;
1659                 }
1660
1661                 ZERO_STRUCTP(current_ace);
1662
1663                 sid_copy(&current_ace->trustee, &psa->trustee);
1664
1665                 /*
1666                  * Try and work out if the SID is a user or group
1667                  * as we need to flag these differently for POSIX.
1668                  * Note what kind of a POSIX ACL this should map to.
1669                  */
1670
1671                 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1672                         current_ace->owner_type = WORLD_ACE;
1673                         current_ace->unix_ug.world = -1;
1674                         current_ace->type = SMB_ACL_OTHER;
1675                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1676                         current_ace->owner_type = UID_ACE;
1677                         current_ace->unix_ug.uid = pst->st_ex_uid;
1678                         current_ace->type = SMB_ACL_USER_OBJ;
1679
1680                         /*
1681                          * The Creator Owner entry only specifies inheritable permissions,
1682                          * never access permissions. WinNT doesn't always set the ACE to
1683                          * INHERIT_ONLY, though.
1684                          */
1685
1686                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1687
1688                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1689                         current_ace->owner_type = GID_ACE;
1690                         current_ace->unix_ug.gid = pst->st_ex_gid;
1691                         current_ace->type = SMB_ACL_GROUP_OBJ;
1692
1693                         /*
1694                          * The Creator Group entry only specifies inheritable permissions,
1695                          * never access permissions. WinNT doesn't always set the ACE to
1696                          * INHERIT_ONLY, though.
1697                          */
1698                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1699
1700                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1701                         current_ace->owner_type = UID_ACE;
1702                         /* If it's the owning user, this is a user_obj, not
1703                          * a user. */
1704                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1705                                 current_ace->type = SMB_ACL_USER_OBJ;
1706                         } else {
1707                                 current_ace->type = SMB_ACL_USER;
1708                         }
1709                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1710                         current_ace->owner_type = GID_ACE;
1711                         /* If it's the primary group, this is a group_obj, not
1712                          * a group. */
1713                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1714                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1715                         } else {
1716                                 current_ace->type = SMB_ACL_GROUP;
1717                         }
1718                 } else {
1719                         /*
1720                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1721                          */
1722
1723                         if (non_mappable_sid(&psa->trustee)) {
1724                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1725                                            "non-mappable SID %s\n",
1726                                            sid_string_dbg(&psa->trustee)));
1727                                 SAFE_FREE(current_ace);
1728                                 continue;
1729                         }
1730
1731                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1732                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1733                                         "unknown or foreign SID %s\n",
1734                                         sid_string_dbg(&psa->trustee)));
1735                                         SAFE_FREE(current_ace);
1736                                 continue;
1737                         }
1738
1739                         free_canon_ace_list(file_ace);
1740                         free_canon_ace_list(dir_ace);
1741                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1742                                   "%s to uid or gid.\n",
1743                                   sid_string_dbg(&current_ace->trustee)));
1744                         SAFE_FREE(current_ace);
1745                         return False;
1746                 }
1747
1748                 /*
1749                  * Map the given NT permissions into a UNIX mode_t containing only
1750                  * S_I(R|W|X)USR bits.
1751                  */
1752
1753                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1754                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1755
1756                 /* Store the ace_flag. */
1757                 current_ace->ace_flags = psa->flags;
1758
1759                 /*
1760                  * Now add the created ace to either the file list, the directory
1761                  * list, or both. We *MUST* preserve the order here (hence we use
1762                  * DLIST_ADD_END) as NT ACLs are order dependent.
1763                  */
1764
1765                 if (fsp->is_directory) {
1766
1767                         /*
1768                          * We can only add to the default POSIX ACE list if the ACE is
1769                          * designed to be inherited by both files and directories.
1770                          */
1771
1772                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1773                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1774
1775                                 canon_ace *current_dir_ace = current_ace;
1776                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1777
1778                                 /*
1779                                  * Note if this was an allow ace. We can't process
1780                                  * any further deny ace's after this.
1781                                  */
1782
1783                                 if (current_ace->attr == ALLOW_ACE)
1784                                         got_dir_allow = True;
1785
1786                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1787                                         DEBUG(0,("create_canon_ace_lists: "
1788                                                  "malformed ACL in "
1789                                                  "inheritable ACL! Deny entry "
1790                                                  "after Allow entry. Failing "
1791                                                  "to set on file %s.\n",
1792                                                  fsp_str_dbg(fsp)));
1793                                         free_canon_ace_list(file_ace);
1794                                         free_canon_ace_list(dir_ace);
1795                                         return False;
1796                                 }
1797
1798                                 if( DEBUGLVL( 10 )) {
1799                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1800                                         print_canon_ace( current_ace, 0);
1801                                 }
1802
1803                                 /*
1804                                  * If this is not an inherit only ACE we need to add a duplicate
1805                                  * to the file acl.
1806                                  */
1807
1808                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1809                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1810
1811                                         if (!dup_ace) {
1812                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1813                                                 free_canon_ace_list(file_ace);
1814                                                 free_canon_ace_list(dir_ace);
1815                                                 return False;
1816                                         }
1817
1818                                         /*
1819                                          * We must not free current_ace here as its
1820                                          * pointer is now owned by the dir_ace list.
1821                                          */
1822                                         current_ace = dup_ace;
1823                                         /* We've essentially split this ace into two,
1824                                          * and added the ace with inheritance request
1825                                          * bits to the directory ACL. Drop those bits for
1826                                          * the ACE we're adding to the file list. */
1827                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1828                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1829                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1830                                 } else {
1831                                         /*
1832                                          * We must not free current_ace here as its
1833                                          * pointer is now owned by the dir_ace list.
1834                                          */
1835                                         current_ace = NULL;
1836                                 }
1837
1838                                 /*
1839                                  * current_ace is now either owned by file_ace
1840                                  * or is NULL. We can safely operate on current_dir_ace
1841                                  * to treat mapping for default acl entries differently
1842                                  * than access acl entries.
1843                                  */
1844
1845                                 if (current_dir_ace->owner_type == UID_ACE) {
1846                                         /*
1847                                          * We already decided above this is a uid,
1848                                          * for default acls ace's only CREATOR_OWNER
1849                                          * maps to ACL_USER_OBJ. All other uid
1850                                          * ace's are ACL_USER.
1851                                          */
1852                                         if (sid_equal(&current_dir_ace->trustee,
1853                                                         &global_sid_Creator_Owner)) {
1854                                                 current_dir_ace->type = SMB_ACL_USER_OBJ;
1855                                         } else {
1856                                                 current_dir_ace->type = SMB_ACL_USER;
1857                                         }
1858                                 }
1859
1860                                 if (current_dir_ace->owner_type == GID_ACE) {
1861                                         /*
1862                                          * We already decided above this is a gid,
1863                                          * for default acls ace's only CREATOR_GROUP
1864                                          * maps to ACL_GROUP_OBJ. All other uid
1865                                          * ace's are ACL_GROUP.
1866                                          */
1867                                         if (sid_equal(&current_dir_ace->trustee,
1868                                                         &global_sid_Creator_Group)) {
1869                                                 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1870                                         } else {
1871                                                 current_dir_ace->type = SMB_ACL_GROUP;
1872                                         }
1873                                 }
1874                         }
1875                 }
1876
1877                 /*
1878                  * Only add to the file ACL if not inherit only.
1879                  */
1880
1881                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1882                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1883
1884                         /*
1885                          * Note if this was an allow ace. We can't process
1886                          * any further deny ace's after this.
1887                          */
1888
1889                         if (current_ace->attr == ALLOW_ACE)
1890                                 got_file_allow = True;
1891
1892                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1893                                 DEBUG(0,("create_canon_ace_lists: malformed "
1894                                          "ACL in file ACL ! Deny entry after "
1895                                          "Allow entry. Failing to set on file "
1896                                          "%s.\n", fsp_str_dbg(fsp)));
1897                                 free_canon_ace_list(file_ace);
1898                                 free_canon_ace_list(dir_ace);
1899                                 return False;
1900                         }
1901
1902                         if( DEBUGLVL( 10 )) {
1903                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1904                                 print_canon_ace( current_ace, 0);
1905                         }
1906                         all_aces_are_inherit_only = False;
1907                         /*
1908                          * We must not free current_ace here as its
1909                          * pointer is now owned by the file_ace list.
1910                          */
1911                         current_ace = NULL;
1912                 }
1913
1914                 /*
1915                  * Free if ACE was not added.
1916                  */
1917
1918                 SAFE_FREE(current_ace);
1919         }
1920
1921         if (fsp->is_directory && all_aces_are_inherit_only) {
1922                 /*
1923                  * Windows 2000 is doing one of these weird 'inherit acl'
1924                  * traverses to conserve NTFS ACL resources. Just pretend
1925                  * there was no DACL sent. JRA.
1926                  */
1927
1928                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1929                 free_canon_ace_list(file_ace);
1930                 free_canon_ace_list(dir_ace);
1931                 file_ace = NULL;
1932                 dir_ace = NULL;
1933         } else {
1934                 /*
1935                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
1936                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1937                  * entries can be converted to *_OBJ. Don't do this for the default
1938                  * ACL, we will create them separately for this if needed inside
1939                  * ensure_canon_entry_valid().
1940                  */
1941                 if (file_ace) {
1942                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1943                 }
1944         }
1945
1946         *ppfile_ace = file_ace;
1947         *ppdir_ace = dir_ace;
1948
1949         return True;
1950 }
1951
1952 /****************************************************************************
1953  ASCII art time again... JRA :-).
1954
1955  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1956  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1957  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1958  allow or deny have been merged, so the same SID can only appear once in the deny
1959  list or once in the allow list.
1960
1961  We then process as follows :
1962
1963  ---------------------------------------------------------------------------
1964  First pass - look for a Everyone DENY entry.
1965
1966  If it is deny all (rwx) trunate the list at this point.
1967  Else, walk the list from this point and use the deny permissions of this
1968  entry as a mask on all following allow entries. Finally, delete
1969  the Everyone DENY entry (we have applied it to everything possible).
1970
1971  In addition, in this pass we remove any DENY entries that have
1972  no permissions (ie. they are a DENY nothing).
1973  ---------------------------------------------------------------------------
1974  Second pass - only deal with deny user entries.
1975
1976  DENY user1 (perms XXX)
1977
1978  new_perms = 0
1979  for all following allow group entries where user1 is in group
1980         new_perms |= group_perms;
1981
1982  user1 entry perms = new_perms & ~ XXX;
1983
1984  Convert the deny entry to an allow entry with the new perms and
1985  push to the end of the list. Note if the user was in no groups
1986  this maps to a specific allow nothing entry for this user.
1987
1988  The common case from the NT ACL choser (userX deny all) is
1989  optimised so we don't do the group lookup - we just map to
1990  an allow nothing entry.
1991
1992  What we're doing here is inferring the allow permissions the
1993  person setting the ACE on user1 wanted by looking at the allow
1994  permissions on the groups the user is currently in. This will
1995  be a snapshot, depending on group membership but is the best
1996  we can do and has the advantage of failing closed rather than
1997  open.
1998  ---------------------------------------------------------------------------
1999  Third pass - only deal with deny group entries.
2000
2001  DENY group1 (perms XXX)
2002
2003  for all following allow user entries where user is in group1
2004    user entry perms = user entry perms & ~ XXX;
2005
2006  If there is a group Everyone allow entry with permissions YYY,
2007  convert the group1 entry to an allow entry and modify its
2008  permissions to be :
2009
2010  new_perms = YYY & ~ XXX
2011
2012  and push to the end of the list.
2013
2014  If there is no group Everyone allow entry then convert the
2015  group1 entry to a allow nothing entry and push to the end of the list.
2016
2017  Note that the common case from the NT ACL choser (groupX deny all)
2018  cannot be optimised here as we need to modify user entries who are
2019  in the group to change them to a deny all also.
2020
2021  What we're doing here is modifying the allow permissions of
2022  user entries (which are more specific in POSIX ACLs) to mask
2023  out the explicit deny set on the group they are in. This will
2024  be a snapshot depending on current group membership but is the
2025  best we can do and has the advantage of failing closed rather
2026  than open.
2027  ---------------------------------------------------------------------------
2028  Fourth pass - cope with cumulative permissions.
2029
2030  for all allow user entries, if there exists an allow group entry with
2031  more permissive permissions, and the user is in that group, rewrite the
2032  allow user permissions to contain both sets of permissions.
2033
2034  Currently the code for this is #ifdef'ed out as these semantics make
2035  no sense to me. JRA.
2036  ---------------------------------------------------------------------------
2037
2038  Note we *MUST* do the deny user pass first as this will convert deny user
2039  entries into allow user entries which can then be processed by the deny
2040  group pass.
2041
2042  The above algorithm took a *lot* of thinking about - hence this
2043  explaination :-). JRA.
2044 ****************************************************************************/
2045
2046 /****************************************************************************
2047  Process a canon_ace list entries. This is very complex code. We need
2048  to go through and remove the "deny" permissions from any allow entry that matches
2049  the id of this entry. We have already refused any NT ACL that wasn't in correct
2050  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2051  we just remove it (to fail safe). We have already removed any duplicate ace
2052  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2053  allow entries.
2054 ****************************************************************************/
2055
2056 static void process_deny_list( canon_ace **pp_ace_list )
2057 {
2058         canon_ace *ace_list = *pp_ace_list;
2059         canon_ace *curr_ace = NULL;
2060         canon_ace *curr_ace_next = NULL;
2061
2062         /* Pass 1 above - look for an Everyone, deny entry. */
2063
2064         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2065                 canon_ace *allow_ace_p;
2066
2067                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2068
2069                 if (curr_ace->attr != DENY_ACE)
2070                         continue;
2071
2072                 if (curr_ace->perms == (mode_t)0) {
2073
2074                         /* Deny nothing entry - delete. */
2075
2076                         DLIST_REMOVE(ace_list, curr_ace);
2077                         continue;
2078                 }
2079
2080                 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2081                         continue;
2082
2083                 /* JRATEST - assert. */
2084                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2085
2086                 if (curr_ace->perms == ALL_ACE_PERMS) {
2087
2088                         /*
2089                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2090                          * list at this point including this entry.
2091                          */
2092
2093                         canon_ace *prev_entry = curr_ace->prev;
2094
2095                         free_canon_ace_list( curr_ace );
2096                         if (prev_entry)
2097                                 prev_entry->next = NULL;
2098                         else {
2099                                 /* We deleted the entire list. */
2100                                 ace_list = NULL;
2101                         }
2102                         break;
2103                 }
2104
2105                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2106
2107                         /*
2108                          * Only mask off allow entries.
2109                          */
2110
2111                         if (allow_ace_p->attr != ALLOW_ACE)
2112                                 continue;
2113
2114                         allow_ace_p->perms &= ~curr_ace->perms;
2115                 }
2116
2117                 /*
2118                  * Now it's been applied, remove it.
2119                  */
2120
2121                 DLIST_REMOVE(ace_list, curr_ace);
2122         }
2123
2124         /* Pass 2 above - deal with deny user entries. */
2125
2126         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2127                 mode_t new_perms = (mode_t)0;
2128                 canon_ace *allow_ace_p;
2129
2130                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2131
2132                 if (curr_ace->attr != DENY_ACE)
2133                         continue;
2134
2135                 if (curr_ace->owner_type != UID_ACE)
2136                         continue;
2137
2138                 if (curr_ace->perms == ALL_ACE_PERMS) {
2139
2140                         /*
2141                          * Optimisation - this is a deny everything to this user.
2142                          * Convert to an allow nothing and push to the end of the list.
2143                          */
2144
2145                         curr_ace->attr = ALLOW_ACE;
2146                         curr_ace->perms = (mode_t)0;
2147                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2148                         continue;
2149                 }
2150
2151                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2152
2153                         if (allow_ace_p->attr != ALLOW_ACE)
2154                                 continue;
2155
2156                         /* We process GID_ACE and WORLD_ACE entries only. */
2157
2158                         if (allow_ace_p->owner_type == UID_ACE)
2159                                 continue;
2160
2161                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2162                                 new_perms |= allow_ace_p->perms;
2163                 }
2164
2165                 /*
2166                  * Convert to a allow entry, modify the perms and push to the end
2167                  * of the list.
2168                  */
2169
2170                 curr_ace->attr = ALLOW_ACE;
2171                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2172                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2173         }
2174
2175         /* Pass 3 above - deal with deny group entries. */
2176
2177         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2178                 canon_ace *allow_ace_p;
2179                 canon_ace *allow_everyone_p = NULL;
2180
2181                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2182
2183                 if (curr_ace->attr != DENY_ACE)
2184                         continue;
2185
2186                 if (curr_ace->owner_type != GID_ACE)
2187                         continue;
2188
2189                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2190
2191                         if (allow_ace_p->attr != ALLOW_ACE)
2192                                 continue;
2193
2194                         /* Store a pointer to the Everyone allow, if it exists. */
2195                         if (allow_ace_p->owner_type == WORLD_ACE)
2196                                 allow_everyone_p = allow_ace_p;
2197
2198                         /* We process UID_ACE entries only. */
2199
2200                         if (allow_ace_p->owner_type != UID_ACE)
2201                                 continue;
2202
2203                         /* Mask off the deny group perms. */
2204
2205                         if (uid_entry_in_group( allow_ace_p, curr_ace))
2206                                 allow_ace_p->perms &= ~curr_ace->perms;
2207                 }
2208
2209                 /*
2210                  * Convert the deny to an allow with the correct perms and
2211                  * push to the end of the list.
2212                  */
2213
2214                 curr_ace->attr = ALLOW_ACE;
2215                 if (allow_everyone_p)
2216                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2217                 else
2218                         curr_ace->perms = (mode_t)0;
2219                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2220         }
2221
2222         /* Doing this fourth pass allows Windows semantics to be layered
2223          * on top of POSIX semantics. I'm not sure if this is desirable.
2224          * For example, in W2K ACLs there is no way to say, "Group X no
2225          * access, user Y full access" if user Y is a member of group X.
2226          * This seems completely broken semantics to me.... JRA.
2227          */
2228
2229 #if 0
2230         /* Pass 4 above - deal with allow entries. */
2231
2232         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2233                 canon_ace *allow_ace_p;
2234
2235                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2236
2237                 if (curr_ace->attr != ALLOW_ACE)
2238                         continue;
2239
2240                 if (curr_ace->owner_type != UID_ACE)
2241                         continue;
2242
2243                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2244
2245                         if (allow_ace_p->attr != ALLOW_ACE)
2246                                 continue;
2247
2248                         /* We process GID_ACE entries only. */
2249
2250                         if (allow_ace_p->owner_type != GID_ACE)
2251                                 continue;
2252
2253                         /* OR in the group perms. */
2254
2255                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2256                                 curr_ace->perms |= allow_ace_p->perms;
2257                 }
2258         }
2259 #endif
2260
2261         *pp_ace_list = ace_list;
2262 }
2263
2264 /****************************************************************************
2265  Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2266  succeeding.
2267 ****************************************************************************/
2268
2269 static bool unpack_canon_ace(files_struct *fsp,
2270                                 const SMB_STRUCT_STAT *pst,
2271                                 DOM_SID *pfile_owner_sid,
2272                                 DOM_SID *pfile_grp_sid,
2273                                 canon_ace **ppfile_ace,
2274                                 canon_ace **ppdir_ace,
2275                                 uint32 security_info_sent,
2276                                 const SEC_DESC *psd)
2277 {
2278         canon_ace *file_ace = NULL;
2279         canon_ace *dir_ace = NULL;
2280
2281         *ppfile_ace = NULL;
2282         *ppdir_ace = NULL;
2283
2284         if(security_info_sent == 0) {
2285                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2286                 return False;
2287         }
2288
2289         /*
2290          * If no DACL then this is a chown only security descriptor.
2291          */
2292
2293         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2294                 return True;
2295
2296         /*
2297          * Now go through the DACL and create the canon_ace lists.
2298          */
2299
2300         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2301                                                                 &file_ace, &dir_ace, psd->dacl))
2302                 return False;
2303
2304         if ((file_ace == NULL) && (dir_ace == NULL)) {
2305                 /* W2K traverse DACL set - ignore. */
2306                 return True;
2307         }
2308
2309         /*
2310          * Go through the canon_ace list and merge entries
2311          * belonging to identical users of identical allow or deny type.
2312          * We can do this as all deny entries come first, followed by
2313          * all allow entries (we have mandated this before accepting this acl).
2314          */
2315
2316         print_canon_ace_list( "file ace - before merge", file_ace);
2317         merge_aces( &file_ace, false);
2318
2319         print_canon_ace_list( "dir ace - before merge", dir_ace);
2320         merge_aces( &dir_ace, true);
2321
2322         /*
2323          * NT ACLs are order dependent. Go through the acl lists and
2324          * process DENY entries by masking the allow entries.
2325          */
2326
2327         print_canon_ace_list( "file ace - before deny", file_ace);
2328         process_deny_list( &file_ace);
2329
2330         print_canon_ace_list( "dir ace - before deny", dir_ace);
2331         process_deny_list( &dir_ace);
2332
2333         /*
2334          * A well formed POSIX file or default ACL has at least 3 entries, a
2335          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2336          * and optionally a mask entry. Ensure this is the case.
2337          */
2338
2339         print_canon_ace_list( "file ace - before valid", file_ace);
2340
2341         if (!ensure_canon_entry_valid(&file_ace, false, fsp->conn->params,
2342                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2343                 free_canon_ace_list(file_ace);
2344                 free_canon_ace_list(dir_ace);
2345                 return False;
2346         }
2347
2348         print_canon_ace_list( "dir ace - before valid", dir_ace);
2349
2350         if (dir_ace && !ensure_canon_entry_valid(&dir_ace, true, fsp->conn->params,
2351                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2352                 free_canon_ace_list(file_ace);
2353                 free_canon_ace_list(dir_ace);
2354                 return False;
2355         }
2356
2357         print_canon_ace_list( "file ace - return", file_ace);
2358         print_canon_ace_list( "dir ace - return", dir_ace);
2359
2360         *ppfile_ace = file_ace;
2361         *ppdir_ace = dir_ace;
2362         return True;
2363
2364 }
2365
2366 /******************************************************************************
2367  When returning permissions, try and fit NT display
2368  semantics if possible. Note the the canon_entries here must have been malloced.
2369  The list format should be - first entry = owner, followed by group and other user
2370  entries, last entry = other.
2371
2372  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2373  are not ordered, and match on the most specific entry rather than walking a list,
2374  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2375
2376  Entry 0: owner : deny all except read and write.
2377  Entry 1: owner : allow read and write.
2378  Entry 2: group : deny all except read.
2379  Entry 3: group : allow read.
2380  Entry 4: Everyone : allow read.
2381
2382  But NT cannot display this in their ACL editor !
2383 ********************************************************************************/
2384
2385 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2386 {
2387         canon_ace *l_head = *pp_list_head;
2388         canon_ace *owner_ace = NULL;
2389         canon_ace *other_ace = NULL;
2390         canon_ace *ace = NULL;
2391
2392         for (ace = l_head; ace; ace = ace->next) {
2393                 if (ace->type == SMB_ACL_USER_OBJ)
2394                         owner_ace = ace;
2395                 else if (ace->type == SMB_ACL_OTHER) {
2396                         /* Last ace - this is "other" */
2397                         other_ace = ace;
2398                 }
2399         }
2400
2401         if (!owner_ace || !other_ace) {
2402                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2403                         filename ));
2404                 return;
2405         }
2406
2407         /*
2408          * The POSIX algorithm applies to owner first, and other last,
2409          * so ensure they are arranged in this order.
2410          */
2411
2412         if (owner_ace) {
2413                 DLIST_PROMOTE(l_head, owner_ace);
2414         }
2415
2416         if (other_ace) {
2417                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2418         }
2419
2420         /* We have probably changed the head of the list. */
2421
2422         *pp_list_head = l_head;
2423 }
2424
2425 /****************************************************************************
2426  Create a linked list of canonical ACE entries.
2427 ****************************************************************************/
2428
2429 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2430                                    const char *fname, SMB_ACL_T posix_acl,
2431                                    const SMB_STRUCT_STAT *psbuf,
2432                                    const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2433 {
2434         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2435         canon_ace *l_head = NULL;
2436         canon_ace *ace = NULL;
2437         canon_ace *next_ace = NULL;
2438         int entry_id = SMB_ACL_FIRST_ENTRY;
2439         bool is_default_acl = (the_acl_type == SMB_ACL_TYPE_DEFAULT);
2440         SMB_ACL_ENTRY_T entry;
2441         size_t ace_count;
2442
2443         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2444                 SMB_ACL_TAG_T tagtype;
2445                 SMB_ACL_PERMSET_T permset;
2446                 DOM_SID sid;
2447                 posix_id unix_ug;
2448                 enum ace_owner owner_type;
2449
2450                 entry_id = SMB_ACL_NEXT_ENTRY;
2451
2452                 /* Is this a MASK entry ? */
2453                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2454                         continue;
2455
2456                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2457                         continue;
2458
2459                 /* Decide which SID to use based on the ACL type. */
2460                 switch(tagtype) {
2461                         case SMB_ACL_USER_OBJ:
2462                                 /* Get the SID from the owner. */
2463                                 sid_copy(&sid, powner);
2464                                 unix_ug.uid = psbuf->st_ex_uid;
2465                                 owner_type = UID_ACE;
2466                                 break;
2467                         case SMB_ACL_USER:
2468                                 {
2469                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2470                                         if (puid == NULL) {
2471                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2472                                                 continue;
2473                                         }
2474                                         uid_to_sid( &sid, *puid);
2475                                         unix_ug.uid = *puid;
2476                                         owner_type = UID_ACE;
2477                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2478                                         break;
2479                                 }
2480                         case SMB_ACL_GROUP_OBJ:
2481                                 /* Get the SID from the owning group. */
2482                                 sid_copy(&sid, pgroup);
2483                                 unix_ug.gid = psbuf->st_ex_gid;
2484                                 owner_type = GID_ACE;
2485                                 break;
2486                         case SMB_ACL_GROUP:
2487                                 {
2488                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2489                                         if (pgid == NULL) {
2490                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2491                                                 continue;
2492                                         }
2493                                         gid_to_sid( &sid, *pgid);
2494                                         unix_ug.gid = *pgid;
2495                                         owner_type = GID_ACE;
2496                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2497                                         break;
2498                                 }
2499                         case SMB_ACL_MASK:
2500                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2501                                 continue; /* Don't count the mask as an entry. */
2502                         case SMB_ACL_OTHER:
2503                                 /* Use the Everyone SID */
2504                                 sid = global_sid_World;
2505                                 unix_ug.world = -1;
2506                                 owner_type = WORLD_ACE;
2507                                 break;
2508                         default:
2509                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2510                                 continue;
2511                 }
2512
2513                 /*
2514                  * Add this entry to the list.
2515                  */
2516
2517                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2518                         goto fail;
2519
2520                 ZERO_STRUCTP(ace);
2521                 ace->type = tagtype;
2522                 ace->perms = convert_permset_to_mode_t(conn, permset);
2523                 ace->attr = ALLOW_ACE;
2524                 ace->trustee = sid;
2525                 ace->unix_ug = unix_ug;
2526                 ace->owner_type = owner_type;
2527                 ace->ace_flags = get_pai_flags(pal, ace, is_default_acl);
2528
2529                 DLIST_ADD(l_head, ace);
2530         }
2531
2532         /*
2533          * This next call will ensure we have at least a user/group/world set.
2534          */
2535
2536         if (!ensure_canon_entry_valid(&l_head, is_default_acl, conn->params,
2537                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2538                                       psbuf, False))
2539                 goto fail;
2540
2541         /*
2542          * Now go through the list, masking the permissions with the
2543          * acl_mask. Ensure all DENY Entries are at the start of the list.
2544          */
2545
2546         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", is_default_acl ?  "Default" : "Access"));
2547
2548         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2549                 next_ace = ace->next;
2550
2551                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2552                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2553                         ace->perms &= acl_mask;
2554
2555                 if (ace->perms == 0) {
2556                         DLIST_PROMOTE(l_head, ace);
2557                 }
2558
2559                 if( DEBUGLVL( 10 ) ) {
2560                         print_canon_ace(ace, ace_count);
2561                 }
2562         }
2563
2564         arrange_posix_perms(fname,&l_head );
2565
2566         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2567
2568         return l_head;
2569
2570   fail:
2571
2572         free_canon_ace_list(l_head);
2573         return NULL;
2574 }
2575
2576 /****************************************************************************
2577  Check if the current user group list contains a given group.
2578 ****************************************************************************/
2579
2580 bool current_user_in_group(gid_t gid)
2581 {
2582         int i;
2583
2584         for (i = 0; i < current_user.ut.ngroups; i++) {
2585                 if (current_user.ut.groups[i] == gid) {
2586                         return True;
2587                 }
2588         }
2589
2590         return False;
2591 }
2592
2593 /****************************************************************************
2594  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2595 ****************************************************************************/
2596
2597 static bool acl_group_override(connection_struct *conn,
2598                                const struct smb_filename *smb_fname)
2599 {
2600         if ((errno != EPERM) && (errno != EACCES)) {
2601                 return false;
2602         }
2603
2604         /* file primary group == user primary or supplementary group */
2605         if (lp_acl_group_control(SNUM(conn)) &&
2606             current_user_in_group(smb_fname->st.st_ex_gid)) {
2607                 return true;
2608         }
2609
2610         /* user has writeable permission */
2611         if (lp_dos_filemode(SNUM(conn)) &&
2612             can_write_to_file(conn, smb_fname)) {
2613                 return true;
2614         }
2615
2616         return false;
2617 }
2618
2619 /****************************************************************************
2620  Attempt to apply an ACL to a file or directory.
2621 ****************************************************************************/
2622
2623 static bool set_canon_ace_list(files_struct *fsp,
2624                                 canon_ace *the_ace,
2625                                 bool default_ace,
2626                                 const SMB_STRUCT_STAT *psbuf,
2627                                 bool *pacl_set_support)
2628 {
2629         connection_struct *conn = fsp->conn;
2630         bool ret = False;
2631         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2632         canon_ace *p_ace;
2633         int i;
2634         SMB_ACL_ENTRY_T mask_entry;
2635         bool got_mask_entry = False;
2636         SMB_ACL_PERMSET_T mask_permset;
2637         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2638         bool needs_mask = False;
2639         mode_t mask_perms = 0;
2640
2641         /* Use the psbuf that was passed in. */
2642         if (psbuf != &fsp->fsp_name->st) {
2643                 fsp->fsp_name->st = *psbuf;
2644         }
2645
2646 #if defined(POSIX_ACL_NEEDS_MASK)
2647         /* HP-UX always wants to have a mask (called "class" there). */
2648         needs_mask = True;
2649 #endif
2650
2651         if (the_acl == NULL) {
2652
2653                 if (!no_acl_syscall_error(errno)) {
2654                         /*
2655                          * Only print this error message if we have some kind of ACL
2656                          * support that's not working. Otherwise we would always get this.
2657                          */
2658                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2659                                 default_ace ? "default" : "file", strerror(errno) ));
2660                 }
2661                 *pacl_set_support = False;
2662                 goto fail;
2663         }
2664
2665         if( DEBUGLVL( 10 )) {
2666                 dbgtext("set_canon_ace_list: setting ACL:\n");
2667                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2668                         print_canon_ace( p_ace, i);
2669                 }
2670         }
2671
2672         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2673                 SMB_ACL_ENTRY_T the_entry;
2674                 SMB_ACL_PERMSET_T the_permset;
2675
2676                 /*
2677                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2678                  * named group entries. But if there is an ACL_MASK entry, it applies
2679                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2680                  * so that it doesn't deny (i.e., mask off) any permissions.
2681                  */
2682
2683                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2684                         needs_mask = True;
2685                         mask_perms |= p_ace->perms;
2686                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2687                         mask_perms |= p_ace->perms;
2688                 }
2689
2690                 /*
2691                  * Get the entry for this ACE.
2692                  */
2693
2694                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2695                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2696                                 i, strerror(errno) ));
2697                         goto fail;
2698                 }
2699
2700                 if (p_ace->type == SMB_ACL_MASK) {
2701                         mask_entry = the_entry;
2702                         got_mask_entry = True;
2703                 }
2704
2705                 /*
2706                  * Ok - we now know the ACL calls should be working, don't
2707                  * allow fallback to chmod.
2708                  */
2709
2710                 *pacl_set_support = True;
2711
2712                 /*
2713                  * Initialise the entry from the canon_ace.
2714                  */
2715
2716                 /*
2717                  * First tell the entry what type of ACE this is.
2718                  */
2719
2720                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2721                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2722                                 i, strerror(errno) ));
2723                         goto fail;
2724                 }
2725
2726                 /*
2727                  * Only set the qualifier (user or group id) if the entry is a user
2728                  * or group id ACE.
2729                  */
2730
2731                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2732                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2733                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2734                                         i, strerror(errno) ));
2735                                 goto fail;
2736                         }
2737                 }
2738
2739                 /*
2740                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2741                  */
2742
2743                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2744                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2745                                 i, strerror(errno) ));
2746                         goto fail;
2747                 }
2748
2749                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2750                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2751                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2752                         goto fail;
2753                 }
2754
2755                 /*
2756                  * ..and apply them to the entry.
2757                  */
2758
2759                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2760                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2761                                 i, strerror(errno) ));
2762                         goto fail;
2763                 }
2764
2765                 if( DEBUGLVL( 10 ))
2766                         print_canon_ace( p_ace, i);
2767
2768         }
2769
2770         if (needs_mask && !got_mask_entry) {
2771                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2772                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2773                         goto fail;
2774                 }
2775
2776                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2777                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2778                         goto fail;
2779                 }
2780
2781                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2782                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2783                         goto fail;
2784                 }
2785
2786                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2787                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2788                         goto fail;
2789                 }
2790
2791                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2792                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2793                         goto fail;
2794                 }
2795         }
2796
2797         /*
2798          * Finally apply it to the file or directory.
2799          */
2800
2801         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2802                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2803                                              the_acl_type, the_acl) == -1) {
2804                         /*
2805                          * Some systems allow all the above calls and only fail with no ACL support
2806                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2807                          */
2808                         if (no_acl_syscall_error(errno)) {
2809                                 *pacl_set_support = False;
2810                         }
2811
2812                         if (acl_group_override(conn, fsp->fsp_name)) {
2813                                 int sret;
2814
2815                                 DEBUG(5,("set_canon_ace_list: acl group "
2816                                          "control on and current user in file "
2817                                          "%s primary group.\n",
2818                                          fsp_str_dbg(fsp)));
2819
2820                                 become_root();
2821                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2822                                     fsp->fsp_name->base_name, the_acl_type,
2823                                     the_acl);
2824                                 unbecome_root();
2825                                 if (sret == 0) {
2826                                         ret = True;
2827                                 }
2828                         }
2829
2830                         if (ret == False) {
2831                                 DEBUG(2,("set_canon_ace_list: "
2832                                          "sys_acl_set_file type %s failed for "
2833                                          "file %s (%s).\n",
2834                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2835                                          "directory default" : "file",
2836                                          fsp_str_dbg(fsp), strerror(errno)));
2837                                 goto fail;
2838                         }
2839                 }
2840         } else {
2841                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2842                         /*
2843                          * Some systems allow all the above calls and only fail with no ACL support
2844                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2845                          */
2846                         if (no_acl_syscall_error(errno)) {
2847                                 *pacl_set_support = False;
2848                         }
2849
2850                         if (acl_group_override(conn, fsp->fsp_name)) {
2851                                 int sret;
2852
2853                                 DEBUG(5,("set_canon_ace_list: acl group "
2854                                          "control on and current user in file "
2855                                          "%s primary group.\n",
2856                                          fsp_str_dbg(fsp)));
2857
2858                                 become_root();
2859                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2860                                 unbecome_root();
2861                                 if (sret == 0) {
2862                                         ret = True;
2863                                 }
2864                         }
2865
2866                         if (ret == False) {
2867                                 DEBUG(2,("set_canon_ace_list: "
2868                                          "sys_acl_set_file failed for file %s "
2869                                          "(%s).\n",
2870                                          fsp_str_dbg(fsp), strerror(errno)));
2871                                 goto fail;
2872                         }
2873                 }
2874         }
2875
2876         ret = True;
2877
2878   fail:
2879
2880         if (the_acl != NULL) {
2881                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2882         }
2883
2884         return ret;
2885 }
2886
2887 /****************************************************************************
2888  Find a particular canon_ace entry.
2889 ****************************************************************************/
2890
2891 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2892 {
2893         while (list) {
2894                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2895                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2896                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2897                         break;
2898                 list = list->next;
2899         }
2900         return list;
2901 }
2902
2903 /****************************************************************************
2904
2905 ****************************************************************************/
2906
2907 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2908 {
2909         SMB_ACL_ENTRY_T entry;
2910
2911         if (!the_acl)
2912                 return NULL;
2913         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2914                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2915                 return NULL;
2916         }
2917         return the_acl;
2918 }
2919
2920 /****************************************************************************
2921  Convert a canon_ace to a generic 3 element permission - if possible.
2922 ****************************************************************************/
2923
2924 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2925
2926 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2927 {
2928         int snum = SNUM(fsp->conn);
2929         size_t ace_count = count_canon_ace_list(file_ace_list);
2930         canon_ace *ace_p;
2931         canon_ace *owner_ace = NULL;
2932         canon_ace *group_ace = NULL;
2933         canon_ace *other_ace = NULL;
2934         mode_t and_bits;
2935         mode_t or_bits;
2936
2937         if (ace_count != 3) {
2938                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2939                          "entries for file %s to convert to posix perms.\n",
2940                          fsp_str_dbg(fsp)));
2941                 return False;
2942         }
2943
2944         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2945                 if (ace_p->owner_type == UID_ACE)
2946                         owner_ace = ace_p;
2947                 else if (ace_p->owner_type == GID_ACE)
2948                         group_ace = ace_p;
2949                 else if (ace_p->owner_type == WORLD_ACE)
2950                         other_ace = ace_p;
2951         }
2952
2953         if (!owner_ace || !group_ace || !other_ace) {
2954                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
2955                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
2956                 return False;
2957         }
2958
2959         *posix_perms = (mode_t)0;
2960
2961         *posix_perms |= owner_ace->perms;
2962         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2963         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2964         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2965         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2966         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2967         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2968
2969         /* The owner must have at least read access. */
2970
2971         *posix_perms |= S_IRUSR;
2972         if (fsp->is_directory)
2973                 *posix_perms |= (S_IWUSR|S_IXUSR);
2974
2975         /* If requested apply the masks. */
2976
2977         /* Get the initial bits to apply. */
2978
2979         if (fsp->is_directory) {
2980                 and_bits = lp_dir_security_mask(snum);
2981                 or_bits = lp_force_dir_security_mode(snum);
2982         } else {
2983                 and_bits = lp_security_mask(snum);
2984                 or_bits = lp_force_security_mode(snum);
2985         }
2986
2987         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2988
2989         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
2990                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
2991                   (int)group_ace->perms, (int)other_ace->perms,
2992                   (int)*posix_perms, fsp_str_dbg(fsp)));
2993
2994         return True;
2995 }
2996
2997 /****************************************************************************
2998   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2999   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3000   with CI|OI set so it is inherited and also applies to the directory.
3001   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3002 ****************************************************************************/
3003
3004 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
3005 {
3006         size_t i, j;
3007
3008         for (i = 0; i < num_aces; i++) {
3009                 for (j = i+1; j < num_aces; j++) {
3010                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3011                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3012                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3013                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3014
3015                         /* We know the lower number ACE's are file entries. */
3016                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3017                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3018                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3019                                 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3020                                 (i_inh == j_inh) &&
3021                                 (i_flags_ni == 0) &&
3022                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3023                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3024                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3025                                 /*
3026                                  * W2K wants to have access allowed zero access ACE's
3027                                  * at the end of the list. If the mask is zero, merge
3028                                  * the non-inherited ACE onto the inherited ACE.
3029                                  */
3030
3031                                 if (nt_ace_list[i].access_mask == 0) {
3032                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3033                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3034                                         if (num_aces - i - 1 > 0)
3035                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3036                                                                 sizeof(SEC_ACE));
3037
3038                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3039                                                 (unsigned int)i, (unsigned int)j ));
3040                                 } else {
3041                                         /*
3042                                          * These are identical except for the flags.
3043                                          * Merge the inherited ACE onto the non-inherited ACE.
3044                                          */
3045
3046                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3047                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3048                                         if (num_aces - j - 1 > 0)
3049                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3050                                                                 sizeof(SEC_ACE));
3051
3052                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3053                                                 (unsigned int)j, (unsigned int)i ));
3054                                 }
3055                                 num_aces--;
3056                                 break;
3057                         }
3058                 }
3059         }
3060
3061         return num_aces;
3062 }
3063
3064 /*
3065  * Add or Replace ACE entry.
3066  * In some cases we need to add a specific ACE for compatibility reasons.
3067  * When doing that we must make sure we are not actually creating a duplicate
3068  * entry. So we need to search whether an ACE entry already exist and eventually
3069  * replacce the access mask, or add a completely new entry if none was found.
3070  *
3071  * This function assumes the array has enough space to add a new entry without
3072  * any reallocation of memory.
3073  */
3074
3075 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3076                                 const DOM_SID *sid, enum security_ace_type type,
3077                                 uint32_t mask, uint8_t flags)
3078 {
3079         int i;
3080
3081         /* first search for a duplicate */
3082         for (i = 0; i < *num_aces; i++) {
3083                 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3084                     (nt_ace_list[i].flags == flags)) break;
3085         }
3086
3087         if (i < *num_aces) { /* found */
3088                 nt_ace_list[i].type = type;
3089                 nt_ace_list[i].access_mask = mask;
3090                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3091                            i, sid_string_dbg(sid), flags));
3092                 return;
3093         }
3094
3095         /* not found, append it */
3096         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3097 }
3098
3099
3100 /****************************************************************************
3101  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3102  the space for the return elements and returns the size needed to return the
3103  security descriptor. This should be the only external function needed for
3104  the UNIX style get ACL.
3105 ****************************************************************************/
3106
3107 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3108                                       const char *name,
3109                                       const SMB_STRUCT_STAT *sbuf,
3110                                       struct pai_val *pal,
3111                                       SMB_ACL_T posix_acl,
3112                                       SMB_ACL_T def_acl,
3113                                       uint32_t security_info,
3114                                       SEC_DESC **ppdesc)
3115 {
3116         DOM_SID owner_sid;
3117         DOM_SID group_sid;
3118         size_t sd_size = 0;
3119         SEC_ACL *psa = NULL;
3120         size_t num_acls = 0;
3121         size_t num_def_acls = 0;
3122         size_t num_aces = 0;
3123         canon_ace *file_ace = NULL;
3124         canon_ace *dir_ace = NULL;
3125         SEC_ACE *nt_ace_list = NULL;
3126         size_t num_profile_acls = 0;
3127         DOM_SID orig_owner_sid;
3128         SEC_DESC *psd = NULL;
3129         int i;
3130
3131         /*
3132          * Get the owner, group and world SIDs.
3133          */
3134
3135         create_file_sids(sbuf, &owner_sid, &group_sid);
3136
3137         if (lp_profile_acls(SNUM(conn))) {
3138                 /* For WXP SP1 the owner must be administrators. */
3139                 sid_copy(&orig_owner_sid, &owner_sid);
3140                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3141                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3142                 num_profile_acls = 3;
3143         }
3144
3145         if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3146
3147                 /*
3148                  * In the optimum case Creator Owner and Creator Group would be used for
3149                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3150                  * would lead to usability problems under Windows: The Creator entries
3151                  * are only available in browse lists of directories and not for files;
3152                  * additionally the identity of the owning group couldn't be determined.
3153                  * We therefore use those identities only for Default ACLs.
3154                  */
3155
3156                 /* Create the canon_ace lists. */
3157                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3158                                             &owner_sid, &group_sid, pal,
3159                                             SMB_ACL_TYPE_ACCESS);
3160
3161                 /* We must have *some* ACLS. */
3162
3163                 if (count_canon_ace_list(file_ace) == 0) {
3164                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3165                         goto done;
3166                 }
3167
3168                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3169                         dir_ace = canonicalise_acl(conn, name, def_acl,
3170                                                    sbuf,
3171                                                    &global_sid_Creator_Owner,
3172                                                    &global_sid_Creator_Group,
3173                                                    pal, SMB_ACL_TYPE_DEFAULT);
3174                 }
3175
3176                 /*
3177                  * Create the NT ACE list from the canonical ace lists.
3178                  */
3179
3180                 {
3181                         canon_ace *ace;
3182                         enum security_ace_type nt_acl_type;
3183
3184                         if (nt4_compatible_acls() && dir_ace) {
3185                                 /*
3186                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3187                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3188                                  * remove entries from the Access ACL if the
3189                                  * corresponding Default ACL entries have also been
3190                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3191                                  * are exceptions. We can do nothing
3192                                  * intelligent if the Default ACL contains entries that
3193                                  * are not also contained in the Access ACL, so this
3194                                  * case will still fail under NT 4.
3195                                  */
3196
3197                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3198                                 if (ace && !ace->perms) {
3199                                         DLIST_REMOVE(dir_ace, ace);
3200                                         SAFE_FREE(ace);
3201
3202                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3203                                         if (ace && !ace->perms) {
3204                                                 DLIST_REMOVE(file_ace, ace);
3205                                                 SAFE_FREE(ace);
3206                                         }
3207                                 }
3208
3209                                 /*
3210                                  * WinNT doesn't usually have Creator Group
3211                                  * in browse lists, so we send this entry to
3212                                  * WinNT even if it contains no relevant
3213                                  * permissions. Once we can add
3214                                  * Creator Group to browse lists we can
3215                                  * re-enable this.
3216                                  */
3217
3218 #if 0
3219                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3220                                 if (ace && !ace->perms) {
3221                                         DLIST_REMOVE(dir_ace, ace);
3222                                         SAFE_FREE(ace);
3223                                 }
3224 #endif
3225
3226                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3227                                 if (ace && !ace->perms) {
3228                                         DLIST_REMOVE(file_ace, ace);
3229                                         SAFE_FREE(ace);
3230                                 }
3231                         }
3232
3233                         num_acls = count_canon_ace_list(file_ace);
3234                         num_def_acls = count_canon_ace_list(dir_ace);
3235
3236                         /* Allocate the ace list. */
3237                         if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3238                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3239                                 goto done;
3240                         }
3241
3242                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3243
3244                         /*
3245                          * Create the NT ACE list from the canonical ace lists.
3246                          */
3247
3248                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3249                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3250                                                 &nt_acl_type,
3251                                                 ace->perms,
3252                                                 S_ISDIR(sbuf->st_ex_mode));
3253                                 init_sec_ace(&nt_ace_list[num_aces++],
3254                                         &ace->trustee,
3255                                         nt_acl_type,
3256                                         acc,
3257                                         ace->ace_flags);
3258                         }
3259
3260                         /* The User must have access to a profile share - even
3261                          * if we can't map the SID. */
3262                         if (lp_profile_acls(SNUM(conn))) {
3263                                 add_or_replace_ace(nt_ace_list, &num_aces,
3264                                                    &global_sid_Builtin_Users,
3265                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3266                                                    FILE_GENERIC_ALL, 0);
3267                         }
3268
3269                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3270                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3271                                                 &nt_acl_type,
3272                                                 ace->perms,
3273                                                 S_ISDIR(sbuf->st_ex_mode));
3274                                 init_sec_ace(&nt_ace_list[num_aces++],
3275                                         &ace->trustee,
3276                                         nt_acl_type,
3277                                         acc,
3278                                         ace->ace_flags |
3279                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3280                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3281                                         SEC_ACE_FLAG_INHERIT_ONLY);
3282                         }
3283
3284                         /* The User must have access to a profile share - even
3285                          * if we can't map the SID. */
3286                         if (lp_profile_acls(SNUM(conn))) {
3287                                 add_or_replace_ace(nt_ace_list, &num_aces,
3288                                                 &global_sid_Builtin_Users,
3289                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3290                                                 FILE_GENERIC_ALL,
3291                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3292                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3293                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3294                         }
3295
3296                         /*
3297                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3298                          * Win2K needs this to get the inheritance correct when replacing ACLs
3299                          * on a directory tree. Based on work by Jim @ IBM.
3300                          */
3301
3302                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3303
3304                         if (lp_profile_acls(SNUM(conn))) {
3305                                 for (i = 0; i < num_aces; i++) {
3306                                         if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3307                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3308                                                                    &orig_owner_sid,
3309                                                                    nt_ace_list[i].type,
3310                                                                    nt_ace_list[i].access_mask,
3311                                                                    nt_ace_list[i].flags);
3312                                                 break;
3313                                         }
3314                                 }
3315                         }
3316                 }
3317
3318                 if (num_aces) {
3319                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3320                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3321                                 goto done;
3322                         }
3323                 }
3324         } /* security_info & DACL_SECURITY_INFORMATION */
3325
3326         psd = make_standard_sec_desc( talloc_tos(),
3327                         (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3328                         (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3329                         psa,
3330                         &sd_size);
3331
3332         if(!psd) {
3333                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3334                 sd_size = 0;
3335                 goto done;
3336         }
3337
3338         /*
3339          * Windows 2000: The DACL_PROTECTED flag in the security
3340          * descriptor marks the ACL as non-inheriting, i.e., no
3341          * ACEs from higher level directories propagate to this
3342          * ACL. In the POSIX ACL model permissions are only
3343          * inherited at file create time, so ACLs never contain
3344          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3345          * flag doesn't seem to bother Windows NT.
3346          * Always set this if map acl inherit is turned off.
3347          */
3348         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3349                 psd->type |= SEC_DESC_DACL_PROTECTED;
3350         } else {
3351                 psd->type |= pal->sd_type;
3352         }
3353
3354         if (psd->dacl) {
3355                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3356         }
3357
3358         *ppdesc = psd;
3359
3360  done:
3361
3362         if (posix_acl) {
3363                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3364         }
3365         if (def_acl) {
3366                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3367         }
3368         free_canon_ace_list(file_ace);
3369         free_canon_ace_list(dir_ace);
3370         free_inherited_info(pal);
3371         SAFE_FREE(nt_ace_list);
3372
3373         return NT_STATUS_OK;
3374 }
3375
3376 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3377                            SEC_DESC **ppdesc)
3378 {
3379         SMB_STRUCT_STAT sbuf;
3380         SMB_ACL_T posix_acl = NULL;
3381         struct pai_val *pal;
3382
3383         *ppdesc = NULL;
3384
3385         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3386                   fsp_str_dbg(fsp)));
3387
3388         /* can it happen that fsp_name == NULL ? */
3389         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3390                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3391                                         security_info, ppdesc);
3392         }
3393
3394         /* Get the stat struct for the owner info. */
3395         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3396                 return map_nt_error_from_unix(errno);
3397         }
3398
3399         /* Get the ACL from the fd. */
3400         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3401
3402         pal = fload_inherited_info(fsp);
3403
3404         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3405                                        &sbuf, pal, posix_acl, NULL,
3406                                        security_info, ppdesc);
3407 }
3408
3409 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3410                           uint32_t security_info, SEC_DESC **ppdesc)
3411 {
3412         SMB_ACL_T posix_acl = NULL;
3413         SMB_ACL_T def_acl = NULL;
3414         struct pai_val *pal;
3415         struct smb_filename smb_fname;
3416         int ret;
3417
3418         *ppdesc = NULL;
3419
3420         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3421
3422         ZERO_STRUCT(smb_fname);
3423         smb_fname.base_name = discard_const_p(char, name);
3424
3425         /* Get the stat struct for the owner info. */
3426         if (lp_posix_pathnames()) {
3427                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3428         } else {
3429                 ret = SMB_VFS_STAT(conn, &smb_fname);
3430         }
3431
3432         if (ret == -1) {
3433                 return map_nt_error_from_unix(errno);
3434         }
3435
3436         /* Get the ACL from the path. */
3437         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3438
3439         /* If it's a directory get the default POSIX ACL. */
3440         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3441                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3442                 def_acl = free_empty_sys_acl(conn, def_acl);
3443         }
3444
3445         pal = load_inherited_info(conn, name);
3446
3447         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3448                                        posix_acl, def_acl, security_info,
3449                                        ppdesc);
3450 }
3451
3452 /****************************************************************************
3453  Try to chown a file. We will be able to chown it under the following conditions.
3454
3455   1) If we have root privileges, then it will just work.
3456   2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3457   3) If we have SeRestorePrivilege we can change the user to any other user.
3458   4) If we have write permission to the file and dos_filemodes is set
3459      then allow chown to the currently authenticated user.
3460 ****************************************************************************/
3461
3462 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3463               uid_t uid, gid_t gid)
3464 {
3465         int ret;
3466         files_struct *fsp;
3467
3468         if(!CAN_WRITE(conn)) {
3469                 return -1;
3470         }
3471
3472         /* Case (1). */
3473         /* try the direct way first */
3474         if (lp_posix_pathnames()) {
3475                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3476         } else {
3477                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3478         }
3479
3480         if (ret == 0)
3481                 return 0;
3482
3483         /* Case (2) / (3) */
3484         if (lp_enable_privileges()) {
3485
3486                 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3487                                                               &se_take_ownership);
3488                 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3489                                                        &se_restore);
3490
3491                 /* Case (2) */
3492                 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3493                 /* Case (3) */
3494                      ( has_restore_priv ) ) {
3495
3496                         become_root();
3497                         /* Keep the current file gid the same - take ownership doesn't imply group change. */
3498                         if (lp_posix_pathnames()) {
3499                                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3500                                                     (gid_t)-1);
3501                         } else {
3502                                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3503                                                     (gid_t)-1);
3504                         }
3505                         unbecome_root();
3506                         return ret;
3507                 }
3508         }
3509
3510         /* Case (4). */
3511         if (!lp_dos_filemode(SNUM(conn))) {
3512                 errno = EPERM;
3513                 return -1;
3514         }
3515
3516         /* only allow chown to the current user. This is more secure,
3517            and also copes with the case where the SID in a take ownership ACL is
3518            a local SID on the users workstation
3519         */
3520         if (uid != current_user.ut.uid) {
3521                 errno = EPERM;
3522                 return -1;
3523         }
3524
3525         if (lp_posix_pathnames()) {
3526                 ret = SMB_VFS_LSTAT(conn, smb_fname);
3527         } else {
3528                 ret = SMB_VFS_STAT(conn, smb_fname);
3529         }
3530
3531         if (ret == -1) {
3532                 return -1;
3533         }
3534
3535         if (!NT_STATUS_IS_OK(open_file_fchmod(conn, smb_fname, &fsp))) {
3536                 return -1;
3537         }
3538
3539         become_root();
3540         /* Keep the current file gid the same. */
3541         if (fsp->fh->fd == -1) {
3542                 if (lp_posix_pathnames()) {
3543                         ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3544                                             (gid_t)-1);
3545                 } else {
3546                         ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3547                                             (gid_t)-1);
3548                 }
3549         } else {
3550                 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3551         }
3552         unbecome_root();
3553
3554         close_file(NULL, fsp, NORMAL_CLOSE);
3555
3556         return ret;
3557 }
3558
3559 #if 0
3560 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3561
3562 /****************************************************************************
3563  Take care of parent ACL inheritance.
3564 ****************************************************************************/
3565
3566 NTSTATUS append_parent_acl(files_struct *fsp,
3567                                 const SEC_DESC *pcsd,
3568                                 SEC_DESC **pp_new_sd)
3569 {
3570         struct smb_filename *smb_dname = NULL;
3571         SEC_DESC *parent_sd = NULL;
3572         files_struct *parent_fsp = NULL;
3573         TALLOC_CTX *mem_ctx = talloc_tos();
3574         char *parent_name = NULL;
3575         SEC_ACE *new_ace = NULL;
3576         unsigned int num_aces = pcsd->dacl->num_aces;
3577         NTSTATUS status;
3578         int info;
3579         unsigned int i, j;
3580         SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3581         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3582
3583         if (psd == NULL) {
3584                 return NT_STATUS_NO_MEMORY;
3585         }
3586
3587         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3588                             NULL)) {
3589                 return NT_STATUS_NO_MEMORY;
3590         }
3591
3592         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3593                                             &smb_dname);
3594         if (!NT_STATUS_IS_OK(status)) {
3595                 goto fail;
3596         }
3597
3598         status = SMB_VFS_CREATE_FILE(
3599                 fsp->conn,                              /* conn */
3600                 NULL,                                   /* req */
3601                 0,                                      /* root_dir_fid */
3602                 smb_dname,                              /* fname */
3603                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3604                 FILE_SHARE_NONE,                        /* share_access */
3605                 FILE_OPEN,                              /* create_disposition*/
3606                 FILE_DIRECTORY_FILE,                    /* create_options */
3607                 0,                                      /* file_attributes */
3608                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3609                 0,                                      /* allocation_size */
3610                 NULL,                                   /* sd */
3611                 NULL,                                   /* ea_list */
3612                 &parent_fsp,                            /* result */
3613                 &info);                                 /* pinfo */
3614
3615         if (!NT_STATUS_IS_OK(status)) {
3616                 TALLOC_FREE(smb_dname);
3617                 return status;
3618         }
3619
3620         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3621                                     DACL_SECURITY_INFORMATION, &parent_sd );
3622
3623         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3624         TALLOC_FREE(smb_dname);
3625
3626         if (!NT_STATUS_IS_OK(status)) {
3627                 return status;
3628         }
3629
3630         /*
3631          * Make room for potentially all the ACLs from
3632          * the parent. We used to add the ugw triple here,
3633          * as we knew we were dealing with POSIX ACLs.
3634          * We no longer need to do so as we can guarentee
3635          * that a default ACL from the parent directory will
3636          * be well formed for POSIX ACLs if it came from a
3637          * POSIX ACL source, and if we're not writing to a
3638          * POSIX ACL sink then we don't care if it's not well
3639          * formed. JRA.
3640          */
3641
3642         num_aces += parent_sd->dacl->num_aces;
3643
3644         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3645                                         num_aces)) == NULL) {
3646                 return NT_STATUS_NO_MEMORY;
3647         }
3648
3649         /* Start by copying in all the given ACE entries. */
3650         for (i = 0; i < psd->dacl->num_aces; i++) {
3651                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3652         }
3653
3654         /*
3655          * Note that we're ignoring "inherit permissions" here
3656          * as that really only applies to newly created files. JRA.
3657          */
3658
3659         /* Finally append any inherited ACEs. */
3660         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3661                 SEC_ACE *se = &parent_sd->dacl->aces[j];
3662
3663                 if (fsp->is_directory) {
3664                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3665                                 /* Doesn't apply to a directory - ignore. */
3666                                 DEBUG(10,("append_parent_acl: directory %s "
3667                                         "ignoring non container "
3668                                         "inherit flags %u on ACE with sid %s "
3669                                         "from parent %s\n",
3670                                         fsp_str_dbg(fsp),
3671                                         (unsigned int)se->flags,
3672                                         sid_string_dbg(&se->trustee),
3673                                         parent_name));
3674                                 continue;
3675                         }
3676                 } else {
3677                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3678                                 /* Doesn't apply to a file - ignore. */
3679                                 DEBUG(10,("append_parent_acl: file %s "
3680                                         "ignoring non object "
3681                                         "inherit flags %u on ACE with sid %s "
3682                                         "from parent %s\n",
3683                                         fsp_str_dbg(fsp),
3684                                         (unsigned int)se->flags,
3685                                         sid_string_dbg(&se->trustee),
3686                                         parent_name));
3687                                 continue;
3688                         }
3689                 }
3690
3691                 if (is_dacl_protected) {
3692                         /* If the DACL is protected it means we must
3693                          * not overwrite an existing ACE entry with the
3694                          * same SID. This is order N^2. Ouch :-(. JRA. */
3695                         unsigned int k;
3696                         for (k = 0; k < psd->dacl->num_aces; k++) {
3697                                 if (sid_equal(&psd->dacl->aces[k].trustee,
3698                                                 &se->trustee)) {
3699                                         break;
3700                                 }
3701                         }
3702                         if (k < psd->dacl->num_aces) {
3703                                 /* SID matched. Ignore. */
3704                                 DEBUG(10,("append_parent_acl: path %s "
3705                                         "ignoring ACE with protected sid %s "
3706                                         "from parent %s\n",
3707                                         fsp_str_dbg(fsp),
3708                                         sid_string_dbg(&se->trustee),
3709                                         parent_name));
3710                                 continue;
3711                         }
3712                 }
3713
3714                 sec_ace_copy(&new_ace[i], se);
3715                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3716                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3717                 }
3718                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3719
3720                 if (fsp->is_directory) {
3721                         /*
3722                          * Strip off any inherit only. It's applied.
3723                          */
3724                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3725                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3726                                 /* No further inheritance. */
3727                                 new_ace[i].flags &=
3728                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3729                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3730                         }
3731                 } else {
3732                         /*
3733                          * Strip off any container or inherit
3734                          * flags, they can't apply to objects.
3735                          */
3736                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3737                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3738                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3739                 }
3740                 i++;
3741
3742                 DEBUG(10,("append_parent_acl: path %s "
3743                         "inheriting ACE with sid %s "
3744                         "from parent %s\n",
3745                         fsp_str_dbg(fsp),
3746                         sid_string_dbg(&se->trustee),
3747                         parent_name));
3748         }
3749
3750         psd->dacl->aces = new_ace;
3751         psd->dacl->num_aces = i;
3752         psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3753                          SE_DESC_DACL_AUTO_INHERIT_REQ);
3754
3755         *pp_new_sd = psd;
3756         return status;
3757 }
3758 #endif
3759
3760 /****************************************************************************
3761  Reply to set a security descriptor on an fsp. security_info_sent is the
3762  description of the following NT ACL.
3763  This should be the only external function needed for the UNIX style set ACL.
3764 ****************************************************************************/
3765
3766 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd_orig)
3767 {
3768         connection_struct *conn = fsp->conn;
3769         uid_t user = (uid_t)-1;
3770         gid_t grp = (gid_t)-1;
3771         DOM_SID file_owner_sid;
3772         DOM_SID file_grp_sid;
3773         canon_ace *file_ace_list = NULL;
3774         canon_ace *dir_ace_list = NULL;
3775         bool acl_perms = False;
3776         mode_t orig_mode = (mode_t)0;
3777         NTSTATUS status;
3778         bool set_acl_as_root = false;
3779         bool acl_set_support = false;
3780         bool ret = false;
3781         SEC_DESC *psd = NULL;
3782
3783         DEBUG(10,("set_nt_acl: called for file %s\n",
3784                   fsp_str_dbg(fsp)));
3785
3786         if (!CAN_WRITE(conn)) {
3787                 DEBUG(10,("set acl rejected on read-only share\n"));
3788                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3789         }
3790
3791         if (!psd_orig) {
3792                 return NT_STATUS_INVALID_PARAMETER;
3793         }
3794
3795         psd = dup_sec_desc(talloc_tos(), psd_orig);
3796         if (!psd) {
3797                 return NT_STATUS_NO_MEMORY;
3798         }
3799
3800         /*
3801          * Get the current state of the file.
3802          */
3803
3804         status = vfs_stat_fsp(fsp);
3805         if (!NT_STATUS_IS_OK(status)) {
3806                 return status;
3807         }
3808
3809         /* Save the original element we check against. */
3810         orig_mode = fsp->fsp_name->st.st_ex_mode;
3811
3812         /*
3813          * Unpack the user/group/world id's.
3814          */
3815
3816         /* POSIX can't cope with missing owner/group. */
3817         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3818                 security_info_sent &= ~SECINFO_OWNER;
3819         }
3820         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3821                 security_info_sent &= ~SECINFO_GROUP;
3822         }
3823
3824         status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3825         if (!NT_STATUS_IS_OK(status)) {
3826                 return status;
3827         }
3828
3829         /*
3830          * Do we need to chown ? If so this must be done first as the incoming
3831          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3832          * Noticed by Simo.
3833          */
3834
3835         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3836             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3837
3838                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3839                          fsp_str_dbg(fsp), (unsigned int)user,
3840                          (unsigned int)grp));
3841
3842                 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3843                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3844                                  "= %s.\n", fsp_str_dbg(fsp),
3845                                  (unsigned int)user, (unsigned int)grp,
3846                                  strerror(errno)));
3847                         if (errno == EPERM) {
3848                                 return NT_STATUS_INVALID_OWNER;
3849                         }
3850                         return map_nt_error_from_unix(errno);
3851                 }
3852
3853                 /*
3854                  * Recheck the current state of the file, which may have changed.
3855                  * (suid/sgid bits, for instance)
3856                  */
3857
3858                 status = vfs_stat_fsp(fsp);
3859                 if (!NT_STATUS_IS_OK(status)) {
3860                         return status;
3861                 }
3862
3863                 /* Save the original element we check against. */
3864                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3865
3866                 /* If we successfully chowned, we know we must
3867                  * be able to set the acl, so do it as root.
3868                  */
3869                 set_acl_as_root = true;
3870         }
3871
3872         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3873
3874         if((security_info_sent & SECINFO_DACL) &&
3875                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3876                         (psd->dacl == NULL)) {
3877                 SEC_ACE ace[3];
3878
3879                 /* We can't have NULL DACL in POSIX.
3880                    Use owner/group/Everyone -> full access. */
3881
3882                 init_sec_ace(&ace[0],
3883                                 &file_owner_sid,
3884                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3885                                 GENERIC_ALL_ACCESS,
3886                                 0);
3887                 init_sec_ace(&ace[1],
3888                                 &file_grp_sid,
3889                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3890                                 GENERIC_ALL_ACCESS,
3891                                 0);
3892                 init_sec_ace(&ace[2],
3893                                 &global_sid_World,
3894                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3895                                 GENERIC_ALL_ACCESS,
3896                                 0);
3897                 psd->dacl = make_sec_acl(talloc_tos(),
3898                                         NT4_ACL_REVISION,
3899                                         3,
3900                                         ace);
3901                 if (psd->dacl == NULL) {
3902                         return NT_STATUS_NO_MEMORY;
3903                 }
3904                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3905         }
3906
3907         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3908                                      &file_grp_sid, &file_ace_list,
3909                                      &dir_ace_list, security_info_sent, psd);
3910
3911         /* Ignore W2K traverse DACL set. */
3912         if (!file_ace_list && !dir_ace_list) {
3913                 return NT_STATUS_OK;
3914         }
3915
3916         if (!acl_perms) {
3917                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3918                 free_canon_ace_list(file_ace_list);
3919                 free_canon_ace_list(dir_ace_list);
3920                 return NT_STATUS_ACCESS_DENIED;
3921         }
3922
3923         /*
3924          * Only change security if we got a DACL.
3925          */
3926
3927         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3928                 free_canon_ace_list(file_ace_list);
3929                 free_canon_ace_list(dir_ace_list);
3930                 return NT_STATUS_OK;
3931         }
3932
3933         /*
3934          * Try using the POSIX ACL set first. Fall back to chmod if
3935          * we have no ACL support on this filesystem.
3936          */
3937
3938         if (acl_perms && file_ace_list) {
3939                 if (set_acl_as_root) {
3940                         become_root();
3941                 }
3942                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3943                                          &fsp->fsp_name->st, &acl_set_support);
3944                 if (set_acl_as_root) {
3945                         unbecome_root();
3946                 }
3947                 if (acl_set_support && ret == false) {
3948                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3949                                  "%s (%s).\n", fsp_str_dbg(fsp),
3950                                  strerror(errno)));
3951                         free_canon_ace_list(file_ace_list);
3952                         free_canon_ace_list(dir_ace_list);
3953                         return map_nt_error_from_unix(errno);
3954                 }
3955         }
3956
3957         if (acl_perms && acl_set_support && fsp->is_directory) {
3958                 if (dir_ace_list) {
3959                         if (set_acl_as_root) {
3960                                 become_root();
3961                         }
3962                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
3963                                                  &fsp->fsp_name->st,
3964                                                  &acl_set_support);
3965                         if (set_acl_as_root) {
3966                                 unbecome_root();
3967                         }
3968                         if (ret == false) {
3969                                 DEBUG(3,("set_nt_acl: failed to set default "
3970                                          "acl on directory %s (%s).\n",
3971                                          fsp_str_dbg(fsp), strerror(errno)));
3972                                 free_canon_ace_list(file_ace_list);
3973                                 free_canon_ace_list(dir_ace_list);
3974                                 return map_nt_error_from_unix(errno);
3975                         }
3976                 } else {
3977                         int sret = -1;
3978
3979                         /*
3980                          * No default ACL - delete one if it exists.
3981                          */
3982
3983                         if (set_acl_as_root) {
3984                                 become_root();
3985                         }
3986                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3987                             fsp->fsp_name->base_name);
3988                         if (set_acl_as_root) {
3989                                 unbecome_root();
3990                         }
3991                         if (sret == -1) {
3992                                 if (acl_group_override(conn, fsp->fsp_name)) {
3993                                         DEBUG(5,("set_nt_acl: acl group "
3994                                                  "control on and current user "
3995                                                  "in file %s primary group. "
3996                                                  "Override delete_def_acl\n",
3997                                                  fsp_str_dbg(fsp)));
3998
3999                                         become_root();
4000                                         sret =
4001                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4002                                                     conn,
4003                                                     fsp->fsp_name->base_name);
4004                                         unbecome_root();
4005                                 }
4006
4007                                 if (sret == -1) {
4008                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4009                                         free_canon_ace_list(file_ace_list);
4010                                         free_canon_ace_list(dir_ace_list);
4011                                         return map_nt_error_from_unix(errno);
4012                                 }
4013                         }
4014                 }
4015         }
4016
4017         if (acl_set_support) {
4018                 if (set_acl_as_root) {
4019                         become_root();
4020                 }
4021                 store_inheritance_attributes(fsp,
4022                                 file_ace_list,
4023                                 dir_ace_list,
4024                                 psd->type);
4025                 if (set_acl_as_root) {
4026                         unbecome_root();
4027                 }
4028         }
4029
4030         /*
4031          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4032          */
4033
4034         if(!acl_set_support && acl_perms) {
4035                 mode_t posix_perms;
4036
4037                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4038                         free_canon_ace_list(file_ace_list);
4039                         free_canon_ace_list(dir_ace_list);
4040                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4041                                  "posix permissions for file %s.\n",
4042                                  fsp_str_dbg(fsp)));
4043                         return NT_STATUS_ACCESS_DENIED;
4044                 }
4045
4046                 if (orig_mode != posix_perms) {
4047                         int sret = -1;
4048
4049                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4050                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4051
4052                         if (set_acl_as_root) {
4053                                 become_root();
4054                         }
4055                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4056                                              posix_perms);
4057                         if (set_acl_as_root) {
4058                                 unbecome_root();
4059                         }
4060                         if(sret == -1) {
4061                                 if (acl_group_override(conn, fsp->fsp_name)) {
4062                                         DEBUG(5,("set_nt_acl: acl group "
4063                                                  "control on and current user "
4064                                                  "in file %s primary group. "
4065                                                  "Override chmod\n",
4066                                                  fsp_str_dbg(fsp)));
4067
4068                                         become_root();
4069                                         sret = SMB_VFS_CHMOD(conn,
4070                                             fsp->fsp_name->base_name,
4071                                             posix_perms);
4072                                         unbecome_root();
4073                                 }
4074
4075                                 if (sret == -1) {
4076                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4077                                                  "failed. Error = %s.\n",
4078                                                  fsp_str_dbg(fsp),
4079                                                  (unsigned int)posix_perms,
4080                                                  strerror(errno)));
4081                                         free_canon_ace_list(file_ace_list);
4082                                         free_canon_ace_list(dir_ace_list);
4083                                         return map_nt_error_from_unix(errno);
4084                                 }
4085                         }
4086                 }
4087         }
4088
4089         free_canon_ace_list(file_ace_list);
4090         free_canon_ace_list(dir_ace_list);
4091
4092         /* Ensure the stat struct in the fsp is correct. */
4093         status = vfs_stat_fsp(fsp);
4094
4095         return NT_STATUS_OK;
4096 }
4097
4098 /****************************************************************************
4099  Get the actual group bits stored on a file with an ACL. Has no effect if
4100  the file has no ACL. Needed in dosmode code where the stat() will return
4101  the mask bits, not the real group bits, for a file with an ACL.
4102 ****************************************************************************/
4103
4104 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4105 {
4106         int entry_id = SMB_ACL_FIRST_ENTRY;
4107         SMB_ACL_ENTRY_T entry;
4108         SMB_ACL_T posix_acl;
4109         int result = -1;
4110
4111         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4112         if (posix_acl == (SMB_ACL_T)NULL)
4113                 return -1;
4114
4115         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4116                 SMB_ACL_TAG_T tagtype;
4117                 SMB_ACL_PERMSET_T permset;
4118
4119                 entry_id = SMB_ACL_NEXT_ENTRY;
4120
4121                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4122                         break;
4123
4124                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4125                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4126                                 break;
4127                         } else {
4128                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4129                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4130                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4131                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4132                                 result = 0;
4133                                 break;
4134                         }
4135                 }
4136         }
4137         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4138         return result;
4139 }
4140
4141 /****************************************************************************
4142  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4143  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4144 ****************************************************************************/
4145
4146 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4147 {
4148         int entry_id = SMB_ACL_FIRST_ENTRY;
4149         SMB_ACL_ENTRY_T entry;
4150         int num_entries = 0;
4151
4152         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4153                 SMB_ACL_TAG_T tagtype;
4154                 SMB_ACL_PERMSET_T permset;
4155                 mode_t perms;
4156
4157                 entry_id = SMB_ACL_NEXT_ENTRY;
4158
4159                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4160                         return -1;
4161
4162                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4163                         return -1;
4164
4165                 num_entries++;
4166
4167                 switch(tagtype) {
4168                         case SMB_ACL_USER_OBJ:
4169                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4170                                 break;
4171                         case SMB_ACL_GROUP_OBJ:
4172                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4173                                 break;
4174                         case SMB_ACL_MASK:
4175                                 /*
4176                                  * FIXME: The ACL_MASK entry permissions should really be set to
4177                                  * the union of the permissions of all ACL_USER,
4178                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4179                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4180                                  */
4181                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4182                                 break;
4183                         case SMB_ACL_OTHER:
4184                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4185                                 break;
4186                         default:
4187                                 continue;
4188                 }
4189
4190                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4191                         return -1;
4192
4193                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4194                         return -1;
4195         }
4196
4197         /*
4198          * If this is a simple 3 element ACL or no elements then it's a standard
4199          * UNIX permission set. Just use chmod...
4200          */
4201
4202         if ((num_entries == 3) || (num_entries == 0))
4203                 return -1;
4204
4205         return 0;
4206 }
4207
4208 /****************************************************************************
4209  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4210  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4211  resulting ACL on TO.  Note that name is in UNIX character set.
4212 ****************************************************************************/
4213
4214 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4215 {
4216         SMB_ACL_T posix_acl = NULL;
4217         int ret = -1;
4218
4219         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4220                 return -1;
4221
4222         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4223                 goto done;
4224
4225         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4226
4227  done:
4228
4229         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4230         return ret;
4231 }
4232
4233 /****************************************************************************
4234  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4235  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4236  Note that name is in UNIX character set.
4237 ****************************************************************************/
4238
4239 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4240 {
4241         return copy_access_posix_acl(conn, name, name, mode);
4242 }
4243
4244 /****************************************************************************
4245  Check for an existing default POSIX ACL on a directory.
4246 ****************************************************************************/
4247
4248 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4249 {
4250         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4251         bool has_acl = False;
4252         SMB_ACL_ENTRY_T entry;
4253
4254         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4255                 has_acl = True;
4256         }
4257
4258         if (def_acl) {
4259                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4260         }
4261         return has_acl;
4262 }
4263
4264 /****************************************************************************
4265  If the parent directory has no default ACL but it does have an Access ACL,
4266  inherit this Access ACL to file name.
4267 ****************************************************************************/
4268
4269 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4270                        const char *name, mode_t mode)
4271 {
4272         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4273                 return 0;
4274
4275         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4276 }
4277
4278 /****************************************************************************
4279  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4280  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4281 ****************************************************************************/
4282
4283 int fchmod_acl(files_struct *fsp, mode_t mode)
4284 {
4285         connection_struct *conn = fsp->conn;
4286         SMB_ACL_T posix_acl = NULL;
4287         int ret = -1;
4288
4289         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4290                 return -1;
4291
4292         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4293                 goto done;
4294
4295         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4296
4297   done:
4298
4299         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4300         return ret;
4301 }
4302
4303 /****************************************************************************
4304  Map from wire type to permset.
4305 ****************************************************************************/
4306
4307 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4308 {
4309         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4310                 return False;
4311         }
4312
4313         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4314                 return False;
4315         }
4316
4317         if (wire_perm & SMB_POSIX_ACL_READ) {
4318                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4319                         return False;
4320                 }
4321         }
4322         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4323                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4324                         return False;
4325                 }
4326         }
4327         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4328                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4329                         return False;
4330                 }
4331         }
4332         return True;
4333 }
4334
4335 /****************************************************************************
4336  Map from wire type to tagtype.
4337 ****************************************************************************/
4338
4339 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4340 {
4341         switch (wire_tt) {
4342                 case SMB_POSIX_ACL_USER_OBJ:
4343                         *p_tt = SMB_ACL_USER_OBJ;
4344                         break;
4345                 case SMB_POSIX_ACL_USER:
4346                         *p_tt = SMB_ACL_USER;
4347                         break;
4348                 case SMB_POSIX_ACL_GROUP_OBJ:
4349                         *p_tt = SMB_ACL_GROUP_OBJ;
4350                         break;
4351                 case SMB_POSIX_ACL_GROUP:
4352                         *p_tt = SMB_ACL_GROUP;
4353                         break;
4354                 case SMB_POSIX_ACL_MASK:
4355                         *p_tt = SMB_ACL_MASK;
4356                         break;
4357                 case SMB_POSIX_ACL_OTHER:
4358                         *p_tt = SMB_ACL_OTHER;
4359                         break;
4360                 default:
4361                         return False;
4362         }
4363         return True;
4364 }
4365
4366 /****************************************************************************
4367  Create a new POSIX acl from wire permissions.
4368  FIXME ! How does the share mask/mode fit into this.... ?
4369 ****************************************************************************/
4370
4371 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4372 {
4373         unsigned int i;
4374         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4375
4376         if (the_acl == NULL) {
4377                 return NULL;
4378         }
4379
4380         for (i = 0; i < num_acls; i++) {
4381                 SMB_ACL_ENTRY_T the_entry;
4382                 SMB_ACL_PERMSET_T the_permset;
4383                 SMB_ACL_TAG_T tag_type;
4384
4385                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4386                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4387                                 i, strerror(errno) ));
4388                         goto fail;
4389                 }
4390
4391                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4392                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4393                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4394                         goto fail;
4395                 }
4396
4397                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4398                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4399                                 i, strerror(errno) ));
4400                         goto fail;
4401                 }
4402
4403                 /* Get the permset pointer from the new ACL entry. */
4404                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4405                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4406                                 i, strerror(errno) ));
4407                         goto fail;
4408                 }
4409
4410                 /* Map from wire to permissions. */
4411                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4412                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4413                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4414                         goto fail;
4415                 }
4416
4417                 /* Now apply to the new ACL entry. */
4418                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4419                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4420                                 i, strerror(errno) ));
4421                         goto fail;
4422                 }
4423
4424                 if (tag_type == SMB_ACL_USER) {
4425                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4426                         uid_t uid = (uid_t)uidval;
4427                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4428                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4429                                         (unsigned int)uid, i, strerror(errno) ));
4430                                 goto fail;
4431                         }
4432                 }
4433
4434                 if (tag_type == SMB_ACL_GROUP) {
4435                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4436                         gid_t gid = (uid_t)gidval;
4437                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4438                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4439                                         (unsigned int)gid, i, strerror(errno) ));
4440                                 goto fail;
4441                         }
4442                 }
4443         }
4444
4445         return the_acl;
4446
4447  fail:
4448
4449         if (the_acl != NULL) {
4450                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4451         }
4452         return NULL;
4453 }
4454
4455 /****************************************************************************
4456  Calls from UNIX extensions - Default POSIX ACL set.
4457  If num_def_acls == 0 and not a directory just return. If it is a directory
4458  and num_def_acls == 0 then remove the default acl. Else set the default acl
4459  on the directory.
4460 ****************************************************************************/
4461
4462 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4463                                 uint16 num_def_acls, const char *pdata)
4464 {
4465         SMB_ACL_T def_acl = NULL;
4466
4467         if (!S_ISDIR(psbuf->st_ex_mode)) {
4468                 if (num_def_acls) {
4469                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4470                         errno = EISDIR;
4471                         return False;
4472                 } else {
4473                         return True;
4474                 }
4475         }
4476
4477         if (!num_def_acls) {
4478                 /* Remove the default ACL. */
4479                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4480                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4481                                 fname, strerror(errno) ));
4482                         return False;
4483                 }
4484                 return True;
4485         }
4486
4487         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4488                 return False;
4489         }
4490
4491         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4492                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4493                         fname, strerror(errno) ));
4494                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4495                 return False;
4496         }
4497
4498         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4499         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4500         return True;
4501 }
4502
4503 /****************************************************************************
4504  Remove an ACL from a file. As we don't have acl_delete_entry() available
4505  we must read the current acl and copy all entries except MASK, USER and GROUP
4506  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4507  removed.
4508  FIXME ! How does the share mask/mode fit into this.... ?
4509 ****************************************************************************/
4510
4511 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4512 {
4513         SMB_ACL_T file_acl = NULL;
4514         int entry_id = SMB_ACL_FIRST_ENTRY;
4515         SMB_ACL_ENTRY_T entry;
4516         bool ret = False;
4517         /* Create a new ACL with only 3 entries, u/g/w. */
4518         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4519         SMB_ACL_ENTRY_T user_ent = NULL;
4520         SMB_ACL_ENTRY_T group_ent = NULL;
4521         SMB_ACL_ENTRY_T other_ent = NULL;
4522
4523         if (new_file_acl == NULL) {
4524                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4525                 return False;
4526         }
4527
4528         /* Now create the u/g/w entries. */
4529         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4530                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4531                         fname, strerror(errno) ));
4532                 goto done;
4533         }
4534         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4535                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4536                         fname, strerror(errno) ));
4537                 goto done;
4538         }
4539
4540         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4541                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4542                         fname, strerror(errno) ));
4543                 goto done;
4544         }
4545         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4546                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4547                         fname, strerror(errno) ));
4548                 goto done;
4549         }
4550
4551         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4552                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4553                         fname, strerror(errno) ));
4554                 goto done;
4555         }
4556         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4557                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4558                         fname, strerror(errno) ));
4559                 goto done;
4560         }
4561
4562         /* Get the current file ACL. */
4563         if (fsp && fsp->fh->fd != -1) {
4564                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4565         } else {
4566                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4567         }
4568
4569         if (file_acl == NULL) {
4570                 /* This is only returned if an error occurred. Even for a file with
4571                    no acl a u/g/w acl should be returned. */
4572                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4573                         fname, strerror(errno) ));
4574                 goto done;
4575         }
4576
4577         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4578                 SMB_ACL_TAG_T tagtype;
4579                 SMB_ACL_PERMSET_T permset;
4580
4581                 entry_id = SMB_ACL_NEXT_ENTRY;
4582
4583                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4584                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4585                                 fname, strerror(errno) ));
4586                         goto done;
4587                 }
4588
4589                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4590                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4591                                 fname, strerror(errno) ));
4592                         goto done;
4593                 }
4594
4595                 if (tagtype == SMB_ACL_USER_OBJ) {
4596                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4597                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4598                                         fname, strerror(errno) ));
4599                         }
4600                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4601                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4602                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4603                                         fname, strerror(errno) ));
4604                         }
4605                 } else if (tagtype == SMB_ACL_OTHER) {
4606                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4607                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4608                                         fname, strerror(errno) ));
4609                         }
4610                 }
4611         }
4612
4613         /* Set the new empty file ACL. */
4614         if (fsp && fsp->fh->fd != -1) {
4615                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4616                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4617                                 fname, strerror(errno) ));
4618                         goto done;
4619                 }
4620         } else {
4621                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4622                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4623                                 fname, strerror(errno) ));
4624                         goto done;
4625                 }
4626         }
4627
4628         ret = True;
4629
4630  done:
4631
4632         if (file_acl) {
4633                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4634         }
4635         if (new_file_acl) {
4636                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4637         }
4638         return ret;
4639 }
4640
4641 /****************************************************************************
4642  Calls from UNIX extensions - POSIX ACL set.
4643  If num_def_acls == 0 then read/modify/write acl after removing all entries
4644  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4645 ****************************************************************************/
4646
4647 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4648 {
4649         SMB_ACL_T file_acl = NULL;
4650
4651         if (!num_acls) {
4652                 /* Remove the ACL from the file. */
4653                 return remove_posix_acl(conn, fsp, fname);
4654         }
4655
4656         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4657                 return False;
4658         }
4659
4660         if (fsp && fsp->fh->fd != -1) {
4661                 /* The preferred way - use an open fd. */
4662                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4663                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4664                                 fname, strerror(errno) ));
4665                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4666                         return False;
4667                 }
4668         } else {
4669                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4670                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4671                                 fname, strerror(errno) ));
4672                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4673                         return False;
4674                 }
4675         }
4676
4677         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4678         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4679         return True;
4680 }
4681
4682 /********************************************************************
4683  Pull the NT ACL from a file on disk or the OpenEventlog() access
4684  check.  Caller is responsible for freeing the returned security
4685  descriptor via TALLOC_FREE().  This is designed for dealing with
4686  user space access checks in smbd outside of the VFS.  For example,
4687  checking access rights in OpenEventlog().
4688
4689  Assume we are dealing with files (for now)
4690 ********************************************************************/
4691
4692 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4693 {
4694         SEC_DESC *psd, *ret_sd;
4695         connection_struct *conn;
4696         files_struct finfo;
4697         struct fd_handle fh;
4698         NTSTATUS status;
4699
4700         conn = TALLOC_ZERO_P(ctx, connection_struct);
4701         if (conn == NULL) {
4702                 DEBUG(0, ("talloc failed\n"));
4703                 return NULL;
4704         }
4705
4706         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4707                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4708                 TALLOC_FREE(conn);
4709                 return NULL;
4710         }
4711
4712         conn->params->service = -1;
4713
4714         set_conn_connectpath(conn, "/");
4715
4716         if (!smbd_vfs_init(conn)) {
4717                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4718                 conn_free(conn);
4719                 return NULL;
4720         }
4721
4722         ZERO_STRUCT( finfo );
4723         ZERO_STRUCT( fh );
4724
4725         finfo.fnum = -1;
4726         finfo.conn = conn;
4727         finfo.fh = &fh;
4728         finfo.fh->fd = -1;
4729
4730         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4731                                             &finfo.fsp_name);
4732         if (!NT_STATUS_IS_OK(status)) {
4733                 conn_free(conn);
4734                 return NULL;
4735         }
4736
4737         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4738                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4739                 TALLOC_FREE(finfo.fsp_name);
4740                 conn_free(conn);
4741                 return NULL;
4742         }
4743
4744         ret_sd = dup_sec_desc( ctx, psd );
4745
4746         TALLOC_FREE(finfo.fsp_name);
4747         conn_free(conn);
4748
4749         return ret_sd;
4750 }
4751
4752 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4753
4754 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4755                                         const char *name,
4756                                         SMB_STRUCT_STAT *psbuf,
4757                                         SEC_DESC **ppdesc)
4758 {
4759         struct dom_sid owner_sid, group_sid;
4760         size_t size = 0;
4761         SEC_ACE aces[4];
4762         uint32_t access_mask = 0;
4763         mode_t mode = psbuf->st_ex_mode;
4764         SEC_ACL *new_dacl = NULL;
4765         int idx = 0;
4766
4767         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4768                 name, (int)mode ));
4769
4770         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4771         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4772
4773         /*
4774          We provide up to 4 ACEs
4775                 - Owner
4776                 - Group
4777                 - Everyone
4778                 - NT System
4779         */
4780
4781         if (mode & S_IRUSR) {
4782                 if (mode & S_IWUSR) {
4783                         access_mask |= SEC_RIGHTS_FILE_ALL;
4784                 } else {
4785                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4786                 }
4787         }
4788         if (mode & S_IWUSR) {
4789                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4790         }
4791
4792         init_sec_ace(&aces[idx],
4793                         &owner_sid,
4794                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4795                         access_mask,
4796                         0);
4797         idx++;
4798
4799         access_mask = 0;
4800         if (mode & S_IRGRP) {
4801                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4802         }
4803         if (mode & S_IWGRP) {
4804                 /* note that delete is not granted - this matches posix behaviour */
4805                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4806         }
4807         if (access_mask) {
4808                 init_sec_ace(&aces[idx],
4809                         &group_sid,
4810                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4811                         access_mask,
4812                         0);
4813                 idx++;
4814         }
4815
4816         access_mask = 0;
4817         if (mode & S_IROTH) {
4818                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4819         }
4820         if (mode & S_IWOTH) {
4821                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4822         }
4823         if (access_mask) {
4824                 init_sec_ace(&aces[idx],
4825                         &global_sid_World,
4826                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4827                         access_mask,
4828                         0);
4829                 idx++;
4830         }
4831
4832         init_sec_ace(&aces[idx],
4833                         &global_sid_System,
4834                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4835                         SEC_RIGHTS_FILE_ALL,
4836                         0);
4837         idx++;
4838
4839         new_dacl = make_sec_acl(ctx,
4840                         NT4_ACL_REVISION,
4841                         idx,
4842                         aces);
4843
4844         if (!new_dacl) {
4845                 return NT_STATUS_NO_MEMORY;
4846         }
4847
4848         *ppdesc = make_sec_desc(ctx,
4849                         SECURITY_DESCRIPTOR_REVISION_1,
4850                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4851                         &owner_sid,
4852                         &group_sid,
4853                         NULL,
4854                         new_dacl,
4855                         &size);
4856         if (!*ppdesc) {
4857                 return NT_STATUS_NO_MEMORY;
4858         }
4859         return NT_STATUS_OK;
4860 }