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                                 const struct share_params *params,
1346                                 const bool is_directory,
1347                                 const DOM_SID *pfile_owner_sid,
1348                                 const DOM_SID *pfile_grp_sid,
1349                                 const SMB_STRUCT_STAT *pst,
1350                                 bool setting_acl)
1351 {
1352         canon_ace *pace;
1353         bool got_user = False;
1354         bool got_grp = False;
1355         bool got_other = False;
1356         canon_ace *pace_other = NULL;
1357
1358         for (pace = *pp_ace; pace; pace = pace->next) {
1359                 if (pace->type == SMB_ACL_USER_OBJ) {
1360
1361                         if (setting_acl)
1362                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1363                         got_user = True;
1364
1365                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1366
1367                         /*
1368                          * Ensure create mask/force create mode is respected on set.
1369                          */
1370
1371                         if (setting_acl)
1372                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1373                         got_grp = True;
1374
1375                 } else if (pace->type == SMB_ACL_OTHER) {
1376
1377                         /*
1378                          * Ensure create mask/force create mode is respected on set.
1379                          */
1380
1381                         if (setting_acl)
1382                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1383                         got_other = True;
1384                         pace_other = pace;
1385                 }
1386         }
1387
1388         if (!got_user) {
1389                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1390                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1391                         return False;
1392                 }
1393
1394                 ZERO_STRUCTP(pace);
1395                 pace->type = SMB_ACL_USER_OBJ;
1396                 pace->owner_type = UID_ACE;
1397                 pace->unix_ug.uid = pst->st_ex_uid;
1398                 pace->trustee = *pfile_owner_sid;
1399                 pace->attr = ALLOW_ACE;
1400                 /* Start with existing permissions, principle of least
1401                    surprises for the user. */
1402                 pace->perms = pst->st_ex_mode;
1403
1404                 if (setting_acl) {
1405                         /* See if the owning user is in any of the other groups in
1406                            the ACE, or if there's a matching user entry.
1407                            If so, OR in the permissions from that entry. */
1408
1409                         canon_ace *pace_iter;
1410
1411                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1412                                 if (pace_iter->type == SMB_ACL_USER &&
1413                                                 pace_iter->unix_ug.uid == pace->unix_ug.uid) {
1414                                         pace->perms |= pace_iter->perms;
1415                                 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1416                                         if (uid_entry_in_group(pace, pace_iter)) {
1417                                                 pace->perms |= pace_iter->perms;
1418                                         }
1419                                 }
1420                         }
1421
1422                         if (pace->perms == 0) {
1423                                 /* If we only got an "everyone" perm, just use that. */
1424                                 if (got_other)
1425                                         pace->perms = pace_other->perms;
1426                         }
1427
1428                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1429                 } else {
1430                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1431                 }
1432
1433                 DLIST_ADD(*pp_ace, pace);
1434         }
1435
1436         if (!got_grp) {
1437                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1438                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1439                         return False;
1440                 }
1441
1442                 ZERO_STRUCTP(pace);
1443                 pace->type = SMB_ACL_GROUP_OBJ;
1444                 pace->owner_type = GID_ACE;
1445                 pace->unix_ug.uid = pst->st_ex_gid;
1446                 pace->trustee = *pfile_grp_sid;
1447                 pace->attr = ALLOW_ACE;
1448                 if (setting_acl) {
1449                         /* If we only got an "everyone" perm, just use that. */
1450                         if (got_other)
1451                                 pace->perms = pace_other->perms;
1452                         else
1453                                 pace->perms = 0;
1454                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1455                 } else {
1456                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1457                 }
1458
1459                 DLIST_ADD(*pp_ace, pace);
1460         }
1461
1462         if (!got_other) {
1463                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1464                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1465                         return False;
1466                 }
1467
1468                 ZERO_STRUCTP(pace);
1469                 pace->type = SMB_ACL_OTHER;
1470                 pace->owner_type = WORLD_ACE;
1471                 pace->unix_ug.world = -1;
1472                 pace->trustee = global_sid_World;
1473                 pace->attr = ALLOW_ACE;
1474                 if (setting_acl) {
1475                         pace->perms = 0;
1476                         apply_default_perms(params, is_directory, pace, S_IROTH);
1477                 } else
1478                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1479
1480                 DLIST_ADD(*pp_ace, pace);
1481         }
1482
1483         return True;
1484 }
1485
1486 /****************************************************************************
1487  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1488  If it does not have them, check if there are any entries where the trustee is the
1489  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1490  Note we must not do this to default directory ACLs.
1491 ****************************************************************************/
1492
1493 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1494 {
1495         bool got_user_obj, got_group_obj;
1496         canon_ace *current_ace;
1497         int i, entries;
1498
1499         entries = count_canon_ace_list(ace);
1500         got_user_obj = False;
1501         got_group_obj = False;
1502
1503         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1504                 if (current_ace->type == SMB_ACL_USER_OBJ)
1505                         got_user_obj = True;
1506                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1507                         got_group_obj = True;
1508         }
1509         if (got_user_obj && got_group_obj) {
1510                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1511                 return;
1512         }
1513
1514         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1515                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1516                                 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1517                         current_ace->type = SMB_ACL_USER_OBJ;
1518                         got_user_obj = True;
1519                 }
1520                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1521                                 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1522                         current_ace->type = SMB_ACL_GROUP_OBJ;
1523                         got_group_obj = True;
1524                 }
1525         }
1526         if (!got_user_obj)
1527                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1528         if (!got_group_obj)
1529                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1530 }
1531
1532 /****************************************************************************
1533  Unpack a SEC_DESC into two canonical ace lists.
1534 ****************************************************************************/
1535
1536 static bool create_canon_ace_lists(files_struct *fsp,
1537                                         const SMB_STRUCT_STAT *pst,
1538                                         DOM_SID *pfile_owner_sid,
1539                                         DOM_SID *pfile_grp_sid,
1540                                         canon_ace **ppfile_ace,
1541                                         canon_ace **ppdir_ace,
1542                                         const SEC_ACL *dacl)
1543 {
1544         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1545         canon_ace *file_ace = NULL;
1546         canon_ace *dir_ace = NULL;
1547         canon_ace *current_ace = NULL;
1548         bool got_dir_allow = False;
1549         bool got_file_allow = False;
1550         int i, j;
1551
1552         *ppfile_ace = NULL;
1553         *ppdir_ace = NULL;
1554
1555         /*
1556          * Convert the incoming ACL into a more regular form.
1557          */
1558
1559         for(i = 0; i < dacl->num_aces; i++) {
1560                 SEC_ACE *psa = &dacl->aces[i];
1561
1562                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1563                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1564                         return False;
1565                 }
1566
1567                 if (nt4_compatible_acls()) {
1568                         /*
1569                          * The security mask may be UNIX_ACCESS_NONE which should map into
1570                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1571                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1572                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1573                          */
1574
1575                         /*
1576                          * Convert GENERIC bits to specific bits.
1577                          */
1578
1579                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1580
1581                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1582
1583                         if(psa->access_mask != UNIX_ACCESS_NONE)
1584                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1585                 }
1586         }
1587
1588         /*
1589          * Deal with the fact that NT 4.x re-writes the canonical format
1590          * that we return for default ACLs. If a directory ACE is identical
1591          * to a inherited directory ACE then NT changes the bits so that the
1592          * first ACE is set to OI|IO and the second ACE for this SID is set
1593          * to CI. We need to repair this. JRA.
1594          */
1595
1596         for(i = 0; i < dacl->num_aces; i++) {
1597                 SEC_ACE *psa1 = &dacl->aces[i];
1598
1599                 for (j = i + 1; j < dacl->num_aces; j++) {
1600                         SEC_ACE *psa2 = &dacl->aces[j];
1601
1602                         if (psa1->access_mask != psa2->access_mask)
1603                                 continue;
1604
1605                         if (!sid_equal(&psa1->trustee, &psa2->trustee))
1606                                 continue;
1607
1608                         /*
1609                          * Ok - permission bits and SIDs are equal.
1610                          * Check if flags were re-written.
1611                          */
1612
1613                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1614
1615                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1616                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1617
1618                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1619
1620                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1621                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1622
1623                         }
1624                 }
1625         }
1626
1627         for(i = 0; i < dacl->num_aces; i++) {
1628                 SEC_ACE *psa = &dacl->aces[i];
1629
1630                 /*
1631                  * Create a cannon_ace entry representing this NT DACL ACE.
1632                  */
1633
1634                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1635                         free_canon_ace_list(file_ace);
1636                         free_canon_ace_list(dir_ace);
1637                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1638                         return False;
1639                 }
1640
1641                 ZERO_STRUCTP(current_ace);
1642
1643                 sid_copy(&current_ace->trustee, &psa->trustee);
1644
1645                 /*
1646                  * Try and work out if the SID is a user or group
1647                  * as we need to flag these differently for POSIX.
1648                  * Note what kind of a POSIX ACL this should map to.
1649                  */
1650
1651                 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1652                         current_ace->owner_type = WORLD_ACE;
1653                         current_ace->unix_ug.world = -1;
1654                         current_ace->type = SMB_ACL_OTHER;
1655                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1656                         current_ace->owner_type = UID_ACE;
1657                         current_ace->unix_ug.uid = pst->st_ex_uid;
1658                         current_ace->type = SMB_ACL_USER_OBJ;
1659
1660                         /*
1661                          * The Creator Owner entry only specifies inheritable permissions,
1662                          * never access permissions. WinNT doesn't always set the ACE to
1663                          * INHERIT_ONLY, though.
1664                          */
1665
1666                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1667
1668                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1669                         current_ace->owner_type = GID_ACE;
1670                         current_ace->unix_ug.gid = pst->st_ex_gid;
1671                         current_ace->type = SMB_ACL_GROUP_OBJ;
1672
1673                         /*
1674                          * The Creator Group entry only specifies inheritable permissions,
1675                          * never access permissions. WinNT doesn't always set the ACE to
1676                          * INHERIT_ONLY, though.
1677                          */
1678                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1679
1680                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1681                         current_ace->owner_type = UID_ACE;
1682                         /* If it's the owning user, this is a user_obj, not
1683                          * a user. */
1684                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1685                                 current_ace->type = SMB_ACL_USER_OBJ;
1686                         } else {
1687                                 current_ace->type = SMB_ACL_USER;
1688                         }
1689                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1690                         current_ace->owner_type = GID_ACE;
1691                         /* If it's the primary group, this is a group_obj, not
1692                          * a group. */
1693                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1694                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1695                         } else {
1696                                 current_ace->type = SMB_ACL_GROUP;
1697                         }
1698                 } else {
1699                         /*
1700                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1701                          */
1702
1703                         if (non_mappable_sid(&psa->trustee)) {
1704                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1705                                            "non-mappable SID %s\n",
1706                                            sid_string_dbg(&psa->trustee)));
1707                                 SAFE_FREE(current_ace);
1708                                 continue;
1709                         }
1710
1711                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1712                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1713                                         "unknown or foreign SID %s\n",
1714                                         sid_string_dbg(&psa->trustee)));
1715                                         SAFE_FREE(current_ace);
1716                                 continue;
1717                         }
1718
1719                         free_canon_ace_list(file_ace);
1720                         free_canon_ace_list(dir_ace);
1721                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1722                                   "%s to uid or gid.\n",
1723                                   sid_string_dbg(&current_ace->trustee)));
1724                         SAFE_FREE(current_ace);
1725                         return False;
1726                 }
1727
1728                 /*
1729                  * Map the given NT permissions into a UNIX mode_t containing only
1730                  * S_I(R|W|X)USR bits.
1731                  */
1732
1733                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1734                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1735
1736                 /* Store the ace_flag. */
1737                 current_ace->ace_flags = psa->flags;
1738
1739                 /*
1740                  * Now add the created ace to either the file list, the directory
1741                  * list, or both. We *MUST* preserve the order here (hence we use
1742                  * DLIST_ADD_END) as NT ACLs are order dependent.
1743                  */
1744
1745                 if (fsp->is_directory) {
1746
1747                         /*
1748                          * We can only add to the default POSIX ACE list if the ACE is
1749                          * designed to be inherited by both files and directories.
1750                          */
1751
1752                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1753                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1754
1755                                 canon_ace *current_dir_ace = current_ace;
1756                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1757
1758                                 /*
1759                                  * Note if this was an allow ace. We can't process
1760                                  * any further deny ace's after this.
1761                                  */
1762
1763                                 if (current_ace->attr == ALLOW_ACE)
1764                                         got_dir_allow = True;
1765
1766                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1767                                         DEBUG(0,("create_canon_ace_lists: "
1768                                                  "malformed ACL in "
1769                                                  "inheritable ACL! Deny entry "
1770                                                  "after Allow entry. Failing "
1771                                                  "to set on file %s.\n",
1772                                                  fsp_str_dbg(fsp)));
1773                                         free_canon_ace_list(file_ace);
1774                                         free_canon_ace_list(dir_ace);
1775                                         return False;
1776                                 }
1777
1778                                 if( DEBUGLVL( 10 )) {
1779                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1780                                         print_canon_ace( current_ace, 0);
1781                                 }
1782
1783                                 /*
1784                                  * If this is not an inherit only ACE we need to add a duplicate
1785                                  * to the file acl.
1786                                  */
1787
1788                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1789                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1790
1791                                         if (!dup_ace) {
1792                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1793                                                 free_canon_ace_list(file_ace);
1794                                                 free_canon_ace_list(dir_ace);
1795                                                 return False;
1796                                         }
1797
1798                                         /*
1799                                          * We must not free current_ace here as its
1800                                          * pointer is now owned by the dir_ace list.
1801                                          */
1802                                         current_ace = dup_ace;
1803                                         /* We've essentially split this ace into two,
1804                                          * and added the ace with inheritance request
1805                                          * bits to the directory ACL. Drop those bits for
1806                                          * the ACE we're adding to the file list. */
1807                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1808                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1809                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1810                                 } else {
1811                                         /*
1812                                          * We must not free current_ace here as its
1813                                          * pointer is now owned by the dir_ace list.
1814                                          */
1815                                         current_ace = NULL;
1816                                 }
1817
1818                                 /*
1819                                  * current_ace is now either owned by file_ace
1820                                  * or is NULL. We can safely operate on current_dir_ace
1821                                  * to treat mapping for default acl entries differently
1822                                  * than access acl entries.
1823                                  */
1824
1825                                 if (current_dir_ace->owner_type == UID_ACE) {
1826                                         /*
1827                                          * We already decided above this is a uid,
1828                                          * for default acls ace's only CREATOR_OWNER
1829                                          * maps to ACL_USER_OBJ. All other uid
1830                                          * ace's are ACL_USER.
1831                                          */
1832                                         if (sid_equal(&current_dir_ace->trustee,
1833                                                         &global_sid_Creator_Owner)) {
1834                                                 current_dir_ace->type = SMB_ACL_USER_OBJ;
1835                                         } else {
1836                                                 current_dir_ace->type = SMB_ACL_USER;
1837                                         }
1838                                 }
1839
1840                                 if (current_dir_ace->owner_type == GID_ACE) {
1841                                         /*
1842                                          * We already decided above this is a gid,
1843                                          * for default acls ace's only CREATOR_GROUP
1844                                          * maps to ACL_GROUP_OBJ. All other uid
1845                                          * ace's are ACL_GROUP.
1846                                          */
1847                                         if (sid_equal(&current_dir_ace->trustee,
1848                                                         &global_sid_Creator_Group)) {
1849                                                 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1850                                         } else {
1851                                                 current_dir_ace->type = SMB_ACL_GROUP;
1852                                         }
1853                                 }
1854                         }
1855                 }
1856
1857                 /*
1858                  * Only add to the file ACL if not inherit only.
1859                  */
1860
1861                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1862                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1863
1864                         /*
1865                          * Note if this was an allow ace. We can't process
1866                          * any further deny ace's after this.
1867                          */
1868
1869                         if (current_ace->attr == ALLOW_ACE)
1870                                 got_file_allow = True;
1871
1872                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1873                                 DEBUG(0,("create_canon_ace_lists: malformed "
1874                                          "ACL in file ACL ! Deny entry after "
1875                                          "Allow entry. Failing to set on file "
1876                                          "%s.\n", fsp_str_dbg(fsp)));
1877                                 free_canon_ace_list(file_ace);
1878                                 free_canon_ace_list(dir_ace);
1879                                 return False;
1880                         }
1881
1882                         if( DEBUGLVL( 10 )) {
1883                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1884                                 print_canon_ace( current_ace, 0);
1885                         }
1886                         all_aces_are_inherit_only = False;
1887                         /*
1888                          * We must not free current_ace here as its
1889                          * pointer is now owned by the file_ace list.
1890                          */
1891                         current_ace = NULL;
1892                 }
1893
1894                 /*
1895                  * Free if ACE was not added.
1896                  */
1897
1898                 SAFE_FREE(current_ace);
1899         }
1900
1901         if (fsp->is_directory && all_aces_are_inherit_only) {
1902                 /*
1903                  * Windows 2000 is doing one of these weird 'inherit acl'
1904                  * traverses to conserve NTFS ACL resources. Just pretend
1905                  * there was no DACL sent. JRA.
1906                  */
1907
1908                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1909                 free_canon_ace_list(file_ace);
1910                 free_canon_ace_list(dir_ace);
1911                 file_ace = NULL;
1912                 dir_ace = NULL;
1913         } else {
1914                 /*
1915                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
1916                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1917                  * entries can be converted to *_OBJ. Don't do this for the default
1918                  * ACL, we will create them separately for this if needed inside
1919                  * ensure_canon_entry_valid().
1920                  */
1921                 if (file_ace) {
1922                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1923                 }
1924         }
1925
1926         *ppfile_ace = file_ace;
1927         *ppdir_ace = dir_ace;
1928
1929         return True;
1930 }
1931
1932 /****************************************************************************
1933  ASCII art time again... JRA :-).
1934
1935  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1936  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1937  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1938  allow or deny have been merged, so the same SID can only appear once in the deny
1939  list or once in the allow list.
1940
1941  We then process as follows :
1942
1943  ---------------------------------------------------------------------------
1944  First pass - look for a Everyone DENY entry.
1945
1946  If it is deny all (rwx) trunate the list at this point.
1947  Else, walk the list from this point and use the deny permissions of this
1948  entry as a mask on all following allow entries. Finally, delete
1949  the Everyone DENY entry (we have applied it to everything possible).
1950
1951  In addition, in this pass we remove any DENY entries that have
1952  no permissions (ie. they are a DENY nothing).
1953  ---------------------------------------------------------------------------
1954  Second pass - only deal with deny user entries.
1955
1956  DENY user1 (perms XXX)
1957
1958  new_perms = 0
1959  for all following allow group entries where user1 is in group
1960         new_perms |= group_perms;
1961
1962  user1 entry perms = new_perms & ~ XXX;
1963
1964  Convert the deny entry to an allow entry with the new perms and
1965  push to the end of the list. Note if the user was in no groups
1966  this maps to a specific allow nothing entry for this user.
1967
1968  The common case from the NT ACL choser (userX deny all) is
1969  optimised so we don't do the group lookup - we just map to
1970  an allow nothing entry.
1971
1972  What we're doing here is inferring the allow permissions the
1973  person setting the ACE on user1 wanted by looking at the allow
1974  permissions on the groups the user is currently in. This will
1975  be a snapshot, depending on group membership but is the best
1976  we can do and has the advantage of failing closed rather than
1977  open.
1978  ---------------------------------------------------------------------------
1979  Third pass - only deal with deny group entries.
1980
1981  DENY group1 (perms XXX)
1982
1983  for all following allow user entries where user is in group1
1984    user entry perms = user entry perms & ~ XXX;
1985
1986  If there is a group Everyone allow entry with permissions YYY,
1987  convert the group1 entry to an allow entry and modify its
1988  permissions to be :
1989
1990  new_perms = YYY & ~ XXX
1991
1992  and push to the end of the list.
1993
1994  If there is no group Everyone allow entry then convert the
1995  group1 entry to a allow nothing entry and push to the end of the list.
1996
1997  Note that the common case from the NT ACL choser (groupX deny all)
1998  cannot be optimised here as we need to modify user entries who are
1999  in the group to change them to a deny all also.
2000
2001  What we're doing here is modifying the allow permissions of
2002  user entries (which are more specific in POSIX ACLs) to mask
2003  out the explicit deny set on the group they are in. This will
2004  be a snapshot depending on current group membership but is the
2005  best we can do and has the advantage of failing closed rather
2006  than open.
2007  ---------------------------------------------------------------------------
2008  Fourth pass - cope with cumulative permissions.
2009
2010  for all allow user entries, if there exists an allow group entry with
2011  more permissive permissions, and the user is in that group, rewrite the
2012  allow user permissions to contain both sets of permissions.
2013
2014  Currently the code for this is #ifdef'ed out as these semantics make
2015  no sense to me. JRA.
2016  ---------------------------------------------------------------------------
2017
2018  Note we *MUST* do the deny user pass first as this will convert deny user
2019  entries into allow user entries which can then be processed by the deny
2020  group pass.
2021
2022  The above algorithm took a *lot* of thinking about - hence this
2023  explaination :-). JRA.
2024 ****************************************************************************/
2025
2026 /****************************************************************************
2027  Process a canon_ace list entries. This is very complex code. We need
2028  to go through and remove the "deny" permissions from any allow entry that matches
2029  the id of this entry. We have already refused any NT ACL that wasn't in correct
2030  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2031  we just remove it (to fail safe). We have already removed any duplicate ace
2032  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2033  allow entries.
2034 ****************************************************************************/
2035
2036 static void process_deny_list( canon_ace **pp_ace_list )
2037 {
2038         canon_ace *ace_list = *pp_ace_list;
2039         canon_ace *curr_ace = NULL;
2040         canon_ace *curr_ace_next = NULL;
2041
2042         /* Pass 1 above - look for an Everyone, deny entry. */
2043
2044         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2045                 canon_ace *allow_ace_p;
2046
2047                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2048
2049                 if (curr_ace->attr != DENY_ACE)
2050                         continue;
2051
2052                 if (curr_ace->perms == (mode_t)0) {
2053
2054                         /* Deny nothing entry - delete. */
2055
2056                         DLIST_REMOVE(ace_list, curr_ace);
2057                         continue;
2058                 }
2059
2060                 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2061                         continue;
2062
2063                 /* JRATEST - assert. */
2064                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2065
2066                 if (curr_ace->perms == ALL_ACE_PERMS) {
2067
2068                         /*
2069                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2070                          * list at this point including this entry.
2071                          */
2072
2073                         canon_ace *prev_entry = curr_ace->prev;
2074
2075                         free_canon_ace_list( curr_ace );
2076                         if (prev_entry)
2077                                 prev_entry->next = NULL;
2078                         else {
2079                                 /* We deleted the entire list. */
2080                                 ace_list = NULL;
2081                         }
2082                         break;
2083                 }
2084
2085                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2086
2087                         /*
2088                          * Only mask off allow entries.
2089                          */
2090
2091                         if (allow_ace_p->attr != ALLOW_ACE)
2092                                 continue;
2093
2094                         allow_ace_p->perms &= ~curr_ace->perms;
2095                 }
2096
2097                 /*
2098                  * Now it's been applied, remove it.
2099                  */
2100
2101                 DLIST_REMOVE(ace_list, curr_ace);
2102         }
2103
2104         /* Pass 2 above - deal with deny user entries. */
2105
2106         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2107                 mode_t new_perms = (mode_t)0;
2108                 canon_ace *allow_ace_p;
2109
2110                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2111
2112                 if (curr_ace->attr != DENY_ACE)
2113                         continue;
2114
2115                 if (curr_ace->owner_type != UID_ACE)
2116                         continue;
2117
2118                 if (curr_ace->perms == ALL_ACE_PERMS) {
2119
2120                         /*
2121                          * Optimisation - this is a deny everything to this user.
2122                          * Convert to an allow nothing and push to the end of the list.
2123                          */
2124
2125                         curr_ace->attr = ALLOW_ACE;
2126                         curr_ace->perms = (mode_t)0;
2127                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2128                         continue;
2129                 }
2130
2131                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2132
2133                         if (allow_ace_p->attr != ALLOW_ACE)
2134                                 continue;
2135
2136                         /* We process GID_ACE and WORLD_ACE entries only. */
2137
2138                         if (allow_ace_p->owner_type == UID_ACE)
2139                                 continue;
2140
2141                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2142                                 new_perms |= allow_ace_p->perms;
2143                 }
2144
2145                 /*
2146                  * Convert to a allow entry, modify the perms and push to the end
2147                  * of the list.
2148                  */
2149
2150                 curr_ace->attr = ALLOW_ACE;
2151                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2152                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2153         }
2154
2155         /* Pass 3 above - deal with deny group entries. */
2156
2157         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2158                 canon_ace *allow_ace_p;
2159                 canon_ace *allow_everyone_p = NULL;
2160
2161                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2162
2163                 if (curr_ace->attr != DENY_ACE)
2164                         continue;
2165
2166                 if (curr_ace->owner_type != GID_ACE)
2167                         continue;
2168
2169                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2170
2171                         if (allow_ace_p->attr != ALLOW_ACE)
2172                                 continue;
2173
2174                         /* Store a pointer to the Everyone allow, if it exists. */
2175                         if (allow_ace_p->owner_type == WORLD_ACE)
2176                                 allow_everyone_p = allow_ace_p;
2177
2178                         /* We process UID_ACE entries only. */
2179
2180                         if (allow_ace_p->owner_type != UID_ACE)
2181                                 continue;
2182
2183                         /* Mask off the deny group perms. */
2184
2185                         if (uid_entry_in_group( allow_ace_p, curr_ace))
2186                                 allow_ace_p->perms &= ~curr_ace->perms;
2187                 }
2188
2189                 /*
2190                  * Convert the deny to an allow with the correct perms and
2191                  * push to the end of the list.
2192                  */
2193
2194                 curr_ace->attr = ALLOW_ACE;
2195                 if (allow_everyone_p)
2196                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2197                 else
2198                         curr_ace->perms = (mode_t)0;
2199                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2200         }
2201
2202         /* Doing this fourth pass allows Windows semantics to be layered
2203          * on top of POSIX semantics. I'm not sure if this is desirable.
2204          * For example, in W2K ACLs there is no way to say, "Group X no
2205          * access, user Y full access" if user Y is a member of group X.
2206          * This seems completely broken semantics to me.... JRA.
2207          */
2208
2209 #if 0
2210         /* Pass 4 above - deal with allow entries. */
2211
2212         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2213                 canon_ace *allow_ace_p;
2214
2215                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2216
2217                 if (curr_ace->attr != ALLOW_ACE)
2218                         continue;
2219
2220                 if (curr_ace->owner_type != UID_ACE)
2221                         continue;
2222
2223                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2224
2225                         if (allow_ace_p->attr != ALLOW_ACE)
2226                                 continue;
2227
2228                         /* We process GID_ACE entries only. */
2229
2230                         if (allow_ace_p->owner_type != GID_ACE)
2231                                 continue;
2232
2233                         /* OR in the group perms. */
2234
2235                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2236                                 curr_ace->perms |= allow_ace_p->perms;
2237                 }
2238         }
2239 #endif
2240
2241         *pp_ace_list = ace_list;
2242 }
2243
2244 /****************************************************************************
2245  Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2246  succeeding.
2247 ****************************************************************************/
2248
2249 static bool unpack_canon_ace(files_struct *fsp,
2250                                 const SMB_STRUCT_STAT *pst,
2251                                 DOM_SID *pfile_owner_sid,
2252                                 DOM_SID *pfile_grp_sid,
2253                                 canon_ace **ppfile_ace,
2254                                 canon_ace **ppdir_ace,
2255                                 uint32 security_info_sent,
2256                                 const SEC_DESC *psd)
2257 {
2258         canon_ace *file_ace = NULL;
2259         canon_ace *dir_ace = NULL;
2260
2261         *ppfile_ace = NULL;
2262         *ppdir_ace = NULL;
2263
2264         if(security_info_sent == 0) {
2265                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2266                 return False;
2267         }
2268
2269         /*
2270          * If no DACL then this is a chown only security descriptor.
2271          */
2272
2273         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2274                 return True;
2275
2276         /*
2277          * Now go through the DACL and create the canon_ace lists.
2278          */
2279
2280         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2281                                                                 &file_ace, &dir_ace, psd->dacl))
2282                 return False;
2283
2284         if ((file_ace == NULL) && (dir_ace == NULL)) {
2285                 /* W2K traverse DACL set - ignore. */
2286                 return True;
2287         }
2288
2289         /*
2290          * Go through the canon_ace list and merge entries
2291          * belonging to identical users of identical allow or deny type.
2292          * We can do this as all deny entries come first, followed by
2293          * all allow entries (we have mandated this before accepting this acl).
2294          */
2295
2296         print_canon_ace_list( "file ace - before merge", file_ace);
2297         merge_aces( &file_ace, false);
2298
2299         print_canon_ace_list( "dir ace - before merge", dir_ace);
2300         merge_aces( &dir_ace, true);
2301
2302         /*
2303          * NT ACLs are order dependent. Go through the acl lists and
2304          * process DENY entries by masking the allow entries.
2305          */
2306
2307         print_canon_ace_list( "file ace - before deny", file_ace);
2308         process_deny_list( &file_ace);
2309
2310         print_canon_ace_list( "dir ace - before deny", dir_ace);
2311         process_deny_list( &dir_ace);
2312
2313         /*
2314          * A well formed POSIX file or default ACL has at least 3 entries, a
2315          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2316          * and optionally a mask entry. Ensure this is the case.
2317          */
2318
2319         print_canon_ace_list( "file ace - before valid", file_ace);
2320
2321         if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params,
2322                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2323                 free_canon_ace_list(file_ace);
2324                 free_canon_ace_list(dir_ace);
2325                 return False;
2326         }
2327
2328         print_canon_ace_list( "dir ace - before valid", dir_ace);
2329
2330         if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params,
2331                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2332                 free_canon_ace_list(file_ace);
2333                 free_canon_ace_list(dir_ace);
2334                 return False;
2335         }
2336
2337         print_canon_ace_list( "file ace - return", file_ace);
2338         print_canon_ace_list( "dir ace - return", dir_ace);
2339
2340         *ppfile_ace = file_ace;
2341         *ppdir_ace = dir_ace;
2342         return True;
2343
2344 }
2345
2346 /******************************************************************************
2347  When returning permissions, try and fit NT display
2348  semantics if possible. Note the the canon_entries here must have been malloced.
2349  The list format should be - first entry = owner, followed by group and other user
2350  entries, last entry = other.
2351
2352  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2353  are not ordered, and match on the most specific entry rather than walking a list,
2354  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2355
2356  Entry 0: owner : deny all except read and write.
2357  Entry 1: owner : allow read and write.
2358  Entry 2: group : deny all except read.
2359  Entry 3: group : allow read.
2360  Entry 4: Everyone : allow read.
2361
2362  But NT cannot display this in their ACL editor !
2363 ********************************************************************************/
2364
2365 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2366 {
2367         canon_ace *l_head = *pp_list_head;
2368         canon_ace *owner_ace = NULL;
2369         canon_ace *other_ace = NULL;
2370         canon_ace *ace = NULL;
2371
2372         for (ace = l_head; ace; ace = ace->next) {
2373                 if (ace->type == SMB_ACL_USER_OBJ)
2374                         owner_ace = ace;
2375                 else if (ace->type == SMB_ACL_OTHER) {
2376                         /* Last ace - this is "other" */
2377                         other_ace = ace;
2378                 }
2379         }
2380
2381         if (!owner_ace || !other_ace) {
2382                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2383                         filename ));
2384                 return;
2385         }
2386
2387         /*
2388          * The POSIX algorithm applies to owner first, and other last,
2389          * so ensure they are arranged in this order.
2390          */
2391
2392         if (owner_ace) {
2393                 DLIST_PROMOTE(l_head, owner_ace);
2394         }
2395
2396         if (other_ace) {
2397                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2398         }
2399
2400         /* We have probably changed the head of the list. */
2401
2402         *pp_list_head = l_head;
2403 }
2404
2405 /****************************************************************************
2406  Create a linked list of canonical ACE entries.
2407 ****************************************************************************/
2408
2409 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2410                                    const char *fname, SMB_ACL_T posix_acl,
2411                                    const SMB_STRUCT_STAT *psbuf,
2412                                    const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2413 {
2414         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2415         canon_ace *l_head = NULL;
2416         canon_ace *ace = NULL;
2417         canon_ace *next_ace = NULL;
2418         int entry_id = SMB_ACL_FIRST_ENTRY;
2419         SMB_ACL_ENTRY_T entry;
2420         size_t ace_count;
2421
2422         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2423                 SMB_ACL_TAG_T tagtype;
2424                 SMB_ACL_PERMSET_T permset;
2425                 DOM_SID sid;
2426                 posix_id unix_ug;
2427                 enum ace_owner owner_type;
2428
2429                 entry_id = SMB_ACL_NEXT_ENTRY;
2430
2431                 /* Is this a MASK entry ? */
2432                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2433                         continue;
2434
2435                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2436                         continue;
2437
2438                 /* Decide which SID to use based on the ACL type. */
2439                 switch(tagtype) {
2440                         case SMB_ACL_USER_OBJ:
2441                                 /* Get the SID from the owner. */
2442                                 sid_copy(&sid, powner);
2443                                 unix_ug.uid = psbuf->st_ex_uid;
2444                                 owner_type = UID_ACE;
2445                                 break;
2446                         case SMB_ACL_USER:
2447                                 {
2448                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2449                                         if (puid == NULL) {
2450                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2451                                                 continue;
2452                                         }
2453                                         uid_to_sid( &sid, *puid);
2454                                         unix_ug.uid = *puid;
2455                                         owner_type = UID_ACE;
2456                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2457                                         break;
2458                                 }
2459                         case SMB_ACL_GROUP_OBJ:
2460                                 /* Get the SID from the owning group. */
2461                                 sid_copy(&sid, pgroup);
2462                                 unix_ug.gid = psbuf->st_ex_gid;
2463                                 owner_type = GID_ACE;
2464                                 break;
2465                         case SMB_ACL_GROUP:
2466                                 {
2467                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2468                                         if (pgid == NULL) {
2469                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2470                                                 continue;
2471                                         }
2472                                         gid_to_sid( &sid, *pgid);
2473                                         unix_ug.gid = *pgid;
2474                                         owner_type = GID_ACE;
2475                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2476                                         break;
2477                                 }
2478                         case SMB_ACL_MASK:
2479                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2480                                 continue; /* Don't count the mask as an entry. */
2481                         case SMB_ACL_OTHER:
2482                                 /* Use the Everyone SID */
2483                                 sid = global_sid_World;
2484                                 unix_ug.world = -1;
2485                                 owner_type = WORLD_ACE;
2486                                 break;
2487                         default:
2488                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2489                                 continue;
2490                 }
2491
2492                 /*
2493                  * Add this entry to the list.
2494                  */
2495
2496                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2497                         goto fail;
2498
2499                 ZERO_STRUCTP(ace);
2500                 ace->type = tagtype;
2501                 ace->perms = convert_permset_to_mode_t(conn, permset);
2502                 ace->attr = ALLOW_ACE;
2503                 ace->trustee = sid;
2504                 ace->unix_ug = unix_ug;
2505                 ace->owner_type = owner_type;
2506                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2507
2508                 DLIST_ADD(l_head, ace);
2509         }
2510
2511         /*
2512          * This next call will ensure we have at least a user/group/world set.
2513          */
2514
2515         if (!ensure_canon_entry_valid(&l_head, conn->params,
2516                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2517                                       psbuf, False))
2518                 goto fail;
2519
2520         /*
2521          * Now go through the list, masking the permissions with the
2522          * acl_mask. Ensure all DENY Entries are at the start of the list.
2523          */
2524
2525         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2526
2527         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2528                 next_ace = ace->next;
2529
2530                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2531                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2532                         ace->perms &= acl_mask;
2533
2534                 if (ace->perms == 0) {
2535                         DLIST_PROMOTE(l_head, ace);
2536                 }
2537
2538                 if( DEBUGLVL( 10 ) ) {
2539                         print_canon_ace(ace, ace_count);
2540                 }
2541         }
2542
2543         arrange_posix_perms(fname,&l_head );
2544
2545         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2546
2547         return l_head;
2548
2549   fail:
2550
2551         free_canon_ace_list(l_head);
2552         return NULL;
2553 }
2554
2555 /****************************************************************************
2556  Check if the current user group list contains a given group.
2557 ****************************************************************************/
2558
2559 bool current_user_in_group(gid_t gid)
2560 {
2561         int i;
2562
2563         for (i = 0; i < current_user.ut.ngroups; i++) {
2564                 if (current_user.ut.groups[i] == gid) {
2565                         return True;
2566                 }
2567         }
2568
2569         return False;
2570 }
2571
2572 /****************************************************************************
2573  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2574 ****************************************************************************/
2575
2576 static bool acl_group_override(connection_struct *conn,
2577                                const struct smb_filename *smb_fname)
2578 {
2579         if ((errno != EPERM) && (errno != EACCES)) {
2580                 return false;
2581         }
2582
2583         /* file primary group == user primary or supplementary group */
2584         if (lp_acl_group_control(SNUM(conn)) &&
2585             current_user_in_group(smb_fname->st.st_ex_gid)) {
2586                 return true;
2587         }
2588
2589         /* user has writeable permission */
2590         if (lp_dos_filemode(SNUM(conn)) &&
2591             can_write_to_file(conn, smb_fname)) {
2592                 return true;
2593         }
2594
2595         return false;
2596 }
2597
2598 /****************************************************************************
2599  Attempt to apply an ACL to a file or directory.
2600 ****************************************************************************/
2601
2602 static bool set_canon_ace_list(files_struct *fsp,
2603                                 canon_ace *the_ace,
2604                                 bool default_ace,
2605                                 const SMB_STRUCT_STAT *psbuf,
2606                                 bool *pacl_set_support)
2607 {
2608         connection_struct *conn = fsp->conn;
2609         bool ret = False;
2610         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2611         canon_ace *p_ace;
2612         int i;
2613         SMB_ACL_ENTRY_T mask_entry;
2614         bool got_mask_entry = False;
2615         SMB_ACL_PERMSET_T mask_permset;
2616         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2617         bool needs_mask = False;
2618         mode_t mask_perms = 0;
2619
2620         /* Use the psbuf that was passed in. */
2621         if (psbuf != &fsp->fsp_name->st) {
2622                 fsp->fsp_name->st = *psbuf;
2623         }
2624
2625 #if defined(POSIX_ACL_NEEDS_MASK)
2626         /* HP-UX always wants to have a mask (called "class" there). */
2627         needs_mask = True;
2628 #endif
2629
2630         if (the_acl == NULL) {
2631
2632                 if (!no_acl_syscall_error(errno)) {
2633                         /*
2634                          * Only print this error message if we have some kind of ACL
2635                          * support that's not working. Otherwise we would always get this.
2636                          */
2637                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2638                                 default_ace ? "default" : "file", strerror(errno) ));
2639                 }
2640                 *pacl_set_support = False;
2641                 goto fail;
2642         }
2643
2644         if( DEBUGLVL( 10 )) {
2645                 dbgtext("set_canon_ace_list: setting ACL:\n");
2646                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2647                         print_canon_ace( p_ace, i);
2648                 }
2649         }
2650
2651         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2652                 SMB_ACL_ENTRY_T the_entry;
2653                 SMB_ACL_PERMSET_T the_permset;
2654
2655                 /*
2656                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2657                  * named group entries. But if there is an ACL_MASK entry, it applies
2658                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2659                  * so that it doesn't deny (i.e., mask off) any permissions.
2660                  */
2661
2662                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2663                         needs_mask = True;
2664                         mask_perms |= p_ace->perms;
2665                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2666                         mask_perms |= p_ace->perms;
2667                 }
2668
2669                 /*
2670                  * Get the entry for this ACE.
2671                  */
2672
2673                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2674                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2675                                 i, strerror(errno) ));
2676                         goto fail;
2677                 }
2678
2679                 if (p_ace->type == SMB_ACL_MASK) {
2680                         mask_entry = the_entry;
2681                         got_mask_entry = True;
2682                 }
2683
2684                 /*
2685                  * Ok - we now know the ACL calls should be working, don't
2686                  * allow fallback to chmod.
2687                  */
2688
2689                 *pacl_set_support = True;
2690
2691                 /*
2692                  * Initialise the entry from the canon_ace.
2693                  */
2694
2695                 /*
2696                  * First tell the entry what type of ACE this is.
2697                  */
2698
2699                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2700                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2701                                 i, strerror(errno) ));
2702                         goto fail;
2703                 }
2704
2705                 /*
2706                  * Only set the qualifier (user or group id) if the entry is a user
2707                  * or group id ACE.
2708                  */
2709
2710                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2711                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2712                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2713                                         i, strerror(errno) ));
2714                                 goto fail;
2715                         }
2716                 }
2717
2718                 /*
2719                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2720                  */
2721
2722                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2723                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2724                                 i, strerror(errno) ));
2725                         goto fail;
2726                 }
2727
2728                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2729                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2730                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2731                         goto fail;
2732                 }
2733
2734                 /*
2735                  * ..and apply them to the entry.
2736                  */
2737
2738                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2739                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2740                                 i, strerror(errno) ));
2741                         goto fail;
2742                 }
2743
2744                 if( DEBUGLVL( 10 ))
2745                         print_canon_ace( p_ace, i);
2746
2747         }
2748
2749         if (needs_mask && !got_mask_entry) {
2750                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2751                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2752                         goto fail;
2753                 }
2754
2755                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2756                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2757                         goto fail;
2758                 }
2759
2760                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2761                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2762                         goto fail;
2763                 }
2764
2765                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2766                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2767                         goto fail;
2768                 }
2769
2770                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2771                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2772                         goto fail;
2773                 }
2774         }
2775
2776         /*
2777          * Finally apply it to the file or directory.
2778          */
2779
2780         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2781                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2782                                              the_acl_type, the_acl) == -1) {
2783                         /*
2784                          * Some systems allow all the above calls and only fail with no ACL support
2785                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2786                          */
2787                         if (no_acl_syscall_error(errno)) {
2788                                 *pacl_set_support = False;
2789                         }
2790
2791                         if (acl_group_override(conn, fsp->fsp_name)) {
2792                                 int sret;
2793
2794                                 DEBUG(5,("set_canon_ace_list: acl group "
2795                                          "control on and current user in file "
2796                                          "%s primary group.\n",
2797                                          fsp_str_dbg(fsp)));
2798
2799                                 become_root();
2800                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2801                                     fsp->fsp_name->base_name, the_acl_type,
2802                                     the_acl);
2803                                 unbecome_root();
2804                                 if (sret == 0) {
2805                                         ret = True;
2806                                 }
2807                         }
2808
2809                         if (ret == False) {
2810                                 DEBUG(2,("set_canon_ace_list: "
2811                                          "sys_acl_set_file type %s failed for "
2812                                          "file %s (%s).\n",
2813                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2814                                          "directory default" : "file",
2815                                          fsp_str_dbg(fsp), strerror(errno)));
2816                                 goto fail;
2817                         }
2818                 }
2819         } else {
2820                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2821                         /*
2822                          * Some systems allow all the above calls and only fail with no ACL support
2823                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2824                          */
2825                         if (no_acl_syscall_error(errno)) {
2826                                 *pacl_set_support = False;
2827                         }
2828
2829                         if (acl_group_override(conn, fsp->fsp_name)) {
2830                                 int sret;
2831
2832                                 DEBUG(5,("set_canon_ace_list: acl group "
2833                                          "control on and current user in file "
2834                                          "%s primary group.\n",
2835                                          fsp_str_dbg(fsp)));
2836
2837                                 become_root();
2838                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2839                                 unbecome_root();
2840                                 if (sret == 0) {
2841                                         ret = True;
2842                                 }
2843                         }
2844
2845                         if (ret == False) {
2846                                 DEBUG(2,("set_canon_ace_list: "
2847                                          "sys_acl_set_file failed for file %s "
2848                                          "(%s).\n",
2849                                          fsp_str_dbg(fsp), strerror(errno)));
2850                                 goto fail;
2851                         }
2852                 }
2853         }
2854
2855         ret = True;
2856
2857   fail:
2858
2859         if (the_acl != NULL) {
2860                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2861         }
2862
2863         return ret;
2864 }
2865
2866 /****************************************************************************
2867  Find a particular canon_ace entry.
2868 ****************************************************************************/
2869
2870 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2871 {
2872         while (list) {
2873                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2874                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2875                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2876                         break;
2877                 list = list->next;
2878         }
2879         return list;
2880 }
2881
2882 /****************************************************************************
2883
2884 ****************************************************************************/
2885
2886 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2887 {
2888         SMB_ACL_ENTRY_T entry;
2889
2890         if (!the_acl)
2891                 return NULL;
2892         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2893                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2894                 return NULL;
2895         }
2896         return the_acl;
2897 }
2898
2899 /****************************************************************************
2900  Convert a canon_ace to a generic 3 element permission - if possible.
2901 ****************************************************************************/
2902
2903 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2904
2905 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2906 {
2907         int snum = SNUM(fsp->conn);
2908         size_t ace_count = count_canon_ace_list(file_ace_list);
2909         canon_ace *ace_p;
2910         canon_ace *owner_ace = NULL;
2911         canon_ace *group_ace = NULL;
2912         canon_ace *other_ace = NULL;
2913         mode_t and_bits;
2914         mode_t or_bits;
2915
2916         if (ace_count != 3) {
2917                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2918                          "entries for file %s to convert to posix perms.\n",
2919                          fsp_str_dbg(fsp)));
2920                 return False;
2921         }
2922
2923         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2924                 if (ace_p->owner_type == UID_ACE)
2925                         owner_ace = ace_p;
2926                 else if (ace_p->owner_type == GID_ACE)
2927                         group_ace = ace_p;
2928                 else if (ace_p->owner_type == WORLD_ACE)
2929                         other_ace = ace_p;
2930         }
2931
2932         if (!owner_ace || !group_ace || !other_ace) {
2933                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
2934                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
2935                 return False;
2936         }
2937
2938         *posix_perms = (mode_t)0;
2939
2940         *posix_perms |= owner_ace->perms;
2941         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2942         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2943         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2944         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2945         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2946         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2947
2948         /* The owner must have at least read access. */
2949
2950         *posix_perms |= S_IRUSR;
2951         if (fsp->is_directory)
2952                 *posix_perms |= (S_IWUSR|S_IXUSR);
2953
2954         /* If requested apply the masks. */
2955
2956         /* Get the initial bits to apply. */
2957
2958         if (fsp->is_directory) {
2959                 and_bits = lp_dir_security_mask(snum);
2960                 or_bits = lp_force_dir_security_mode(snum);
2961         } else {
2962                 and_bits = lp_security_mask(snum);
2963                 or_bits = lp_force_security_mode(snum);
2964         }
2965
2966         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2967
2968         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
2969                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
2970                   (int)group_ace->perms, (int)other_ace->perms,
2971                   (int)*posix_perms, fsp_str_dbg(fsp)));
2972
2973         return True;
2974 }
2975
2976 /****************************************************************************
2977   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2978   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2979   with CI|OI set so it is inherited and also applies to the directory.
2980   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2981 ****************************************************************************/
2982
2983 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2984 {
2985         size_t i, j;
2986
2987         for (i = 0; i < num_aces; i++) {
2988                 for (j = i+1; j < num_aces; j++) {
2989                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2990                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2991                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2992                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2993
2994                         /* We know the lower number ACE's are file entries. */
2995                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2996                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2997                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2998                                 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2999                                 (i_inh == j_inh) &&
3000                                 (i_flags_ni == 0) &&
3001                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3002                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3003                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3004                                 /*
3005                                  * W2K wants to have access allowed zero access ACE's
3006                                  * at the end of the list. If the mask is zero, merge
3007                                  * the non-inherited ACE onto the inherited ACE.
3008                                  */
3009
3010                                 if (nt_ace_list[i].access_mask == 0) {
3011                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3012                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3013                                         if (num_aces - i - 1 > 0)
3014                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3015                                                                 sizeof(SEC_ACE));
3016
3017                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3018                                                 (unsigned int)i, (unsigned int)j ));
3019                                 } else {
3020                                         /*
3021                                          * These are identical except for the flags.
3022                                          * Merge the inherited ACE onto the non-inherited ACE.
3023                                          */
3024
3025                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3026                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3027                                         if (num_aces - j - 1 > 0)
3028                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3029                                                                 sizeof(SEC_ACE));
3030
3031                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3032                                                 (unsigned int)j, (unsigned int)i ));
3033                                 }
3034                                 num_aces--;
3035                                 break;
3036                         }
3037                 }
3038         }
3039
3040         return num_aces;
3041 }
3042
3043 /*
3044  * Add or Replace ACE entry.
3045  * In some cases we need to add a specific ACE for compatibility reasons.
3046  * When doing that we must make sure we are not actually creating a duplicate
3047  * entry. So we need to search whether an ACE entry already exist and eventually
3048  * replacce the access mask, or add a completely new entry if none was found.
3049  *
3050  * This function assumes the array has enough space to add a new entry without
3051  * any reallocation of memory.
3052  */
3053
3054 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3055                                 const DOM_SID *sid, enum security_ace_type type,
3056                                 uint32_t mask, uint8_t flags)
3057 {
3058         int i;
3059
3060         /* first search for a duplicate */
3061         for (i = 0; i < *num_aces; i++) {
3062                 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3063                     (nt_ace_list[i].flags == flags)) break;
3064         }
3065
3066         if (i < *num_aces) { /* found */
3067                 nt_ace_list[i].type = type;
3068                 nt_ace_list[i].access_mask = mask;
3069                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3070                            i, sid_string_dbg(sid), flags));
3071                 return;
3072         }
3073
3074         /* not found, append it */
3075         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3076 }
3077
3078
3079 /****************************************************************************
3080  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3081  the space for the return elements and returns the size needed to return the
3082  security descriptor. This should be the only external function needed for
3083  the UNIX style get ACL.
3084 ****************************************************************************/
3085
3086 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3087                                       const char *name,
3088                                       const SMB_STRUCT_STAT *sbuf,
3089                                       struct pai_val *pal,
3090                                       SMB_ACL_T posix_acl,
3091                                       SMB_ACL_T def_acl,
3092                                       uint32_t security_info,
3093                                       SEC_DESC **ppdesc)
3094 {
3095         DOM_SID owner_sid;
3096         DOM_SID group_sid;
3097         size_t sd_size = 0;
3098         SEC_ACL *psa = NULL;
3099         size_t num_acls = 0;
3100         size_t num_def_acls = 0;
3101         size_t num_aces = 0;
3102         canon_ace *file_ace = NULL;
3103         canon_ace *dir_ace = NULL;
3104         SEC_ACE *nt_ace_list = NULL;
3105         size_t num_profile_acls = 0;
3106         DOM_SID orig_owner_sid;
3107         SEC_DESC *psd = NULL;
3108         int i;
3109
3110         /*
3111          * Get the owner, group and world SIDs.
3112          */
3113
3114         create_file_sids(sbuf, &owner_sid, &group_sid);
3115
3116         if (lp_profile_acls(SNUM(conn))) {
3117                 /* For WXP SP1 the owner must be administrators. */
3118                 sid_copy(&orig_owner_sid, &owner_sid);
3119                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3120                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3121                 num_profile_acls = 3;
3122         }
3123
3124         if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3125
3126                 /*
3127                  * In the optimum case Creator Owner and Creator Group would be used for
3128                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3129                  * would lead to usability problems under Windows: The Creator entries
3130                  * are only available in browse lists of directories and not for files;
3131                  * additionally the identity of the owning group couldn't be determined.
3132                  * We therefore use those identities only for Default ACLs.
3133                  */
3134
3135                 /* Create the canon_ace lists. */
3136                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3137                                             &owner_sid, &group_sid, pal,
3138                                             SMB_ACL_TYPE_ACCESS);
3139
3140                 /* We must have *some* ACLS. */
3141
3142                 if (count_canon_ace_list(file_ace) == 0) {
3143                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3144                         goto done;
3145                 }
3146
3147                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3148                         dir_ace = canonicalise_acl(conn, name, def_acl,
3149                                                    sbuf,
3150                                                    &global_sid_Creator_Owner,
3151                                                    &global_sid_Creator_Group,
3152                                                    pal, SMB_ACL_TYPE_DEFAULT);
3153                 }
3154
3155                 /*
3156                  * Create the NT ACE list from the canonical ace lists.
3157                  */
3158
3159                 {
3160                         canon_ace *ace;
3161                         enum security_ace_type nt_acl_type;
3162
3163                         if (nt4_compatible_acls() && dir_ace) {
3164                                 /*
3165                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3166                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3167                                  * remove entries from the Access ACL if the
3168                                  * corresponding Default ACL entries have also been
3169                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3170                                  * are exceptions. We can do nothing
3171                                  * intelligent if the Default ACL contains entries that
3172                                  * are not also contained in the Access ACL, so this
3173                                  * case will still fail under NT 4.
3174                                  */
3175
3176                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3177                                 if (ace && !ace->perms) {
3178                                         DLIST_REMOVE(dir_ace, ace);
3179                                         SAFE_FREE(ace);
3180
3181                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3182                                         if (ace && !ace->perms) {
3183                                                 DLIST_REMOVE(file_ace, ace);
3184                                                 SAFE_FREE(ace);
3185                                         }
3186                                 }
3187
3188                                 /*
3189                                  * WinNT doesn't usually have Creator Group
3190                                  * in browse lists, so we send this entry to
3191                                  * WinNT even if it contains no relevant
3192                                  * permissions. Once we can add
3193                                  * Creator Group to browse lists we can
3194                                  * re-enable this.
3195                                  */
3196
3197 #if 0
3198                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3199                                 if (ace && !ace->perms) {
3200                                         DLIST_REMOVE(dir_ace, ace);
3201                                         SAFE_FREE(ace);
3202                                 }
3203 #endif
3204
3205                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3206                                 if (ace && !ace->perms) {
3207                                         DLIST_REMOVE(file_ace, ace);
3208                                         SAFE_FREE(ace);
3209                                 }
3210                         }
3211
3212                         num_acls = count_canon_ace_list(file_ace);
3213                         num_def_acls = count_canon_ace_list(dir_ace);
3214
3215                         /* Allocate the ace list. */
3216                         if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3217                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3218                                 goto done;
3219                         }
3220
3221                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3222
3223                         /*
3224                          * Create the NT ACE list from the canonical ace lists.
3225                          */
3226
3227                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3228                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3229                                                 &nt_acl_type,
3230                                                 ace->perms,
3231                                                 S_ISDIR(sbuf->st_ex_mode));
3232                                 init_sec_ace(&nt_ace_list[num_aces++],
3233                                         &ace->trustee,
3234                                         nt_acl_type,
3235                                         acc,
3236                                         ace->ace_flags);
3237                         }
3238
3239                         /* The User must have access to a profile share - even
3240                          * if we can't map the SID. */
3241                         if (lp_profile_acls(SNUM(conn))) {
3242                                 add_or_replace_ace(nt_ace_list, &num_aces,
3243                                                    &global_sid_Builtin_Users,
3244                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3245                                                    FILE_GENERIC_ALL, 0);
3246                         }
3247
3248                         for (ace = dir_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                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3259                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3260                                         SEC_ACE_FLAG_INHERIT_ONLY);
3261                         }
3262
3263                         /* The User must have access to a profile share - even
3264                          * if we can't map the SID. */
3265                         if (lp_profile_acls(SNUM(conn))) {
3266                                 add_or_replace_ace(nt_ace_list, &num_aces,
3267                                                 &global_sid_Builtin_Users,
3268                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3269                                                 FILE_GENERIC_ALL,
3270                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3271                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3272                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3273                         }
3274
3275                         /*
3276                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3277                          * Win2K needs this to get the inheritance correct when replacing ACLs
3278                          * on a directory tree. Based on work by Jim @ IBM.
3279                          */
3280
3281                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3282
3283                         if (lp_profile_acls(SNUM(conn))) {
3284                                 for (i = 0; i < num_aces; i++) {
3285                                         if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3286                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3287                                                                    &orig_owner_sid,
3288                                                                    nt_ace_list[i].type,
3289                                                                    nt_ace_list[i].access_mask,
3290                                                                    nt_ace_list[i].flags);
3291                                                 break;
3292                                         }
3293                                 }
3294                         }
3295                 }
3296
3297                 if (num_aces) {
3298                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3299                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3300                                 goto done;
3301                         }
3302                 }
3303         } /* security_info & DACL_SECURITY_INFORMATION */
3304
3305         psd = make_standard_sec_desc( talloc_tos(),
3306                         (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3307                         (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3308                         psa,
3309                         &sd_size);
3310
3311         if(!psd) {
3312                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3313                 sd_size = 0;
3314                 goto done;
3315         }
3316
3317         /*
3318          * Windows 2000: The DACL_PROTECTED flag in the security
3319          * descriptor marks the ACL as non-inheriting, i.e., no
3320          * ACEs from higher level directories propagate to this
3321          * ACL. In the POSIX ACL model permissions are only
3322          * inherited at file create time, so ACLs never contain
3323          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3324          * flag doesn't seem to bother Windows NT.
3325          * Always set this if map acl inherit is turned off.
3326          */
3327         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3328                 psd->type |= SEC_DESC_DACL_PROTECTED;
3329         } else {
3330                 psd->type |= pal->sd_type;
3331         }
3332
3333         if (psd->dacl) {
3334                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3335         }
3336
3337         *ppdesc = psd;
3338
3339  done:
3340
3341         if (posix_acl) {
3342                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3343         }
3344         if (def_acl) {
3345                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3346         }
3347         free_canon_ace_list(file_ace);
3348         free_canon_ace_list(dir_ace);
3349         free_inherited_info(pal);
3350         SAFE_FREE(nt_ace_list);
3351
3352         return NT_STATUS_OK;
3353 }
3354
3355 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3356                            SEC_DESC **ppdesc)
3357 {
3358         SMB_STRUCT_STAT sbuf;
3359         SMB_ACL_T posix_acl = NULL;
3360         struct pai_val *pal;
3361
3362         *ppdesc = NULL;
3363
3364         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3365                   fsp_str_dbg(fsp)));
3366
3367         /* can it happen that fsp_name == NULL ? */
3368         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3369                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3370                                         security_info, ppdesc);
3371         }
3372
3373         /* Get the stat struct for the owner info. */
3374         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3375                 return map_nt_error_from_unix(errno);
3376         }
3377
3378         /* Get the ACL from the fd. */
3379         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3380
3381         pal = fload_inherited_info(fsp);
3382
3383         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3384                                        &sbuf, pal, posix_acl, NULL,
3385                                        security_info, ppdesc);
3386 }
3387
3388 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3389                           uint32_t security_info, SEC_DESC **ppdesc)
3390 {
3391         SMB_ACL_T posix_acl = NULL;
3392         SMB_ACL_T def_acl = NULL;
3393         struct pai_val *pal;
3394         struct smb_filename smb_fname;
3395         int ret;
3396
3397         *ppdesc = NULL;
3398
3399         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3400
3401         ZERO_STRUCT(smb_fname);
3402         smb_fname.base_name = discard_const_p(char, name);
3403
3404         /* Get the stat struct for the owner info. */
3405         if (lp_posix_pathnames()) {
3406                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3407         } else {
3408                 ret = SMB_VFS_STAT(conn, &smb_fname);
3409         }
3410
3411         if (ret == -1) {
3412                 return map_nt_error_from_unix(errno);
3413         }
3414
3415         /* Get the ACL from the path. */
3416         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3417
3418         /* If it's a directory get the default POSIX ACL. */
3419         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3420                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3421                 def_acl = free_empty_sys_acl(conn, def_acl);
3422         }
3423
3424         pal = load_inherited_info(conn, name);
3425
3426         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3427                                        posix_acl, def_acl, security_info,
3428                                        ppdesc);
3429 }
3430
3431 /****************************************************************************
3432  Try to chown a file. We will be able to chown it under the following conditions.
3433
3434   1) If we have root privileges, then it will just work.
3435   2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3436   3) If we have SeRestorePrivilege we can change the user to any other user.
3437   4) If we have write permission to the file and dos_filemodes is set
3438      then allow chown to the currently authenticated user.
3439 ****************************************************************************/
3440
3441 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3442               uid_t uid, gid_t gid)
3443 {
3444         int ret;
3445         files_struct *fsp;
3446
3447         if(!CAN_WRITE(conn)) {
3448                 return -1;
3449         }
3450
3451         /* Case (1). */
3452         /* try the direct way first */
3453         if (lp_posix_pathnames()) {
3454                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3455         } else {
3456                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3457         }
3458
3459         if (ret == 0)
3460                 return 0;
3461
3462         /* Case (2) / (3) */
3463         if (lp_enable_privileges()) {
3464
3465                 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3466                                                               &se_take_ownership);
3467                 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3468                                                        &se_restore);
3469
3470                 /* Case (2) */
3471                 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3472                 /* Case (3) */
3473                      ( has_restore_priv ) ) {
3474
3475                         become_root();
3476                         /* Keep the current file gid the same - take ownership doesn't imply group change. */
3477                         if (lp_posix_pathnames()) {
3478                                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3479                                                     (gid_t)-1);
3480                         } else {
3481                                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3482                                                     (gid_t)-1);
3483                         }
3484                         unbecome_root();
3485                         return ret;
3486                 }
3487         }
3488
3489         /* Case (4). */
3490         if (!lp_dos_filemode(SNUM(conn))) {
3491                 errno = EPERM;
3492                 return -1;
3493         }
3494
3495         /* only allow chown to the current user. This is more secure,
3496            and also copes with the case where the SID in a take ownership ACL is
3497            a local SID on the users workstation
3498         */
3499         if (uid != current_user.ut.uid) {
3500                 errno = EPERM;
3501                 return -1;
3502         }
3503
3504         if (lp_posix_pathnames()) {
3505                 ret = SMB_VFS_LSTAT(conn, smb_fname);
3506         } else {
3507                 ret = SMB_VFS_STAT(conn, smb_fname);
3508         }
3509
3510         if (ret == -1) {
3511                 return -1;
3512         }
3513
3514         if (!NT_STATUS_IS_OK(open_file_fchmod(conn, smb_fname, &fsp))) {
3515                 return -1;
3516         }
3517
3518         become_root();
3519         /* Keep the current file gid the same. */
3520         if (fsp->fh->fd == -1) {
3521                 if (lp_posix_pathnames()) {
3522                         ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3523                                             (gid_t)-1);
3524                 } else {
3525                         ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3526                                             (gid_t)-1);
3527                 }
3528         } else {
3529                 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3530         }
3531         unbecome_root();
3532
3533         close_file(NULL, fsp, NORMAL_CLOSE);
3534
3535         return ret;
3536 }
3537
3538 #if 0
3539 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3540
3541 /****************************************************************************
3542  Take care of parent ACL inheritance.
3543 ****************************************************************************/
3544
3545 NTSTATUS append_parent_acl(files_struct *fsp,
3546                                 const SEC_DESC *pcsd,
3547                                 SEC_DESC **pp_new_sd)
3548 {
3549         struct smb_filename *smb_dname = NULL;
3550         SEC_DESC *parent_sd = NULL;
3551         files_struct *parent_fsp = NULL;
3552         TALLOC_CTX *mem_ctx = talloc_tos();
3553         char *parent_name = NULL;
3554         SEC_ACE *new_ace = NULL;
3555         unsigned int num_aces = pcsd->dacl->num_aces;
3556         NTSTATUS status;
3557         int info;
3558         unsigned int i, j;
3559         SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3560         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3561
3562         if (psd == NULL) {
3563                 return NT_STATUS_NO_MEMORY;
3564         }
3565
3566         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3567                             NULL)) {
3568                 return NT_STATUS_NO_MEMORY;
3569         }
3570
3571         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3572                                             &smb_dname);
3573         if (!NT_STATUS_IS_OK(status)) {
3574                 goto fail;
3575         }
3576
3577         status = SMB_VFS_CREATE_FILE(
3578                 fsp->conn,                              /* conn */
3579                 NULL,                                   /* req */
3580                 0,                                      /* root_dir_fid */
3581                 smb_dname,                              /* fname */
3582                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3583                 FILE_SHARE_NONE,                        /* share_access */
3584                 FILE_OPEN,                              /* create_disposition*/
3585                 FILE_DIRECTORY_FILE,                    /* create_options */
3586                 0,                                      /* file_attributes */
3587                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3588                 0,                                      /* allocation_size */
3589                 NULL,                                   /* sd */
3590                 NULL,                                   /* ea_list */
3591                 &parent_fsp,                            /* result */
3592                 &info);                                 /* pinfo */
3593
3594         if (!NT_STATUS_IS_OK(status)) {
3595                 TALLOC_FREE(smb_dname);
3596                 return status;
3597         }
3598
3599         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3600                                     DACL_SECURITY_INFORMATION, &parent_sd );
3601
3602         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3603         TALLOC_FREE(smb_dname);
3604
3605         if (!NT_STATUS_IS_OK(status)) {
3606                 return status;
3607         }
3608
3609         /*
3610          * Make room for potentially all the ACLs from
3611          * the parent. We used to add the ugw triple here,
3612          * as we knew we were dealing with POSIX ACLs.
3613          * We no longer need to do so as we can guarentee
3614          * that a default ACL from the parent directory will
3615          * be well formed for POSIX ACLs if it came from a
3616          * POSIX ACL source, and if we're not writing to a
3617          * POSIX ACL sink then we don't care if it's not well
3618          * formed. JRA.
3619          */
3620
3621         num_aces += parent_sd->dacl->num_aces;
3622
3623         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3624                                         num_aces)) == NULL) {
3625                 return NT_STATUS_NO_MEMORY;
3626         }
3627
3628         /* Start by copying in all the given ACE entries. */
3629         for (i = 0; i < psd->dacl->num_aces; i++) {
3630                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3631         }
3632
3633         /*
3634          * Note that we're ignoring "inherit permissions" here
3635          * as that really only applies to newly created files. JRA.
3636          */
3637
3638         /* Finally append any inherited ACEs. */
3639         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3640                 SEC_ACE *se = &parent_sd->dacl->aces[j];
3641
3642                 if (fsp->is_directory) {
3643                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3644                                 /* Doesn't apply to a directory - ignore. */
3645                                 DEBUG(10,("append_parent_acl: directory %s "
3646                                         "ignoring non container "
3647                                         "inherit flags %u on ACE with sid %s "
3648                                         "from parent %s\n",
3649                                         fsp_str_dbg(fsp),
3650                                         (unsigned int)se->flags,
3651                                         sid_string_dbg(&se->trustee),
3652                                         parent_name));
3653                                 continue;
3654                         }
3655                 } else {
3656                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3657                                 /* Doesn't apply to a file - ignore. */
3658                                 DEBUG(10,("append_parent_acl: file %s "
3659                                         "ignoring non object "
3660                                         "inherit flags %u on ACE with sid %s "
3661                                         "from parent %s\n",
3662                                         fsp_str_dbg(fsp),
3663                                         (unsigned int)se->flags,
3664                                         sid_string_dbg(&se->trustee),
3665                                         parent_name));
3666                                 continue;
3667                         }
3668                 }
3669
3670                 if (is_dacl_protected) {
3671                         /* If the DACL is protected it means we must
3672                          * not overwrite an existing ACE entry with the
3673                          * same SID. This is order N^2. Ouch :-(. JRA. */
3674                         unsigned int k;
3675                         for (k = 0; k < psd->dacl->num_aces; k++) {
3676                                 if (sid_equal(&psd->dacl->aces[k].trustee,
3677                                                 &se->trustee)) {
3678                                         break;
3679                                 }
3680                         }
3681                         if (k < psd->dacl->num_aces) {
3682                                 /* SID matched. Ignore. */
3683                                 DEBUG(10,("append_parent_acl: path %s "
3684                                         "ignoring ACE with protected sid %s "
3685                                         "from parent %s\n",
3686                                         fsp_str_dbg(fsp),
3687                                         sid_string_dbg(&se->trustee),
3688                                         parent_name));
3689                                 continue;
3690                         }
3691                 }
3692
3693                 sec_ace_copy(&new_ace[i], se);
3694                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3695                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3696                 }
3697                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3698
3699                 if (fsp->is_directory) {
3700                         /*
3701                          * Strip off any inherit only. It's applied.
3702                          */
3703                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3704                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3705                                 /* No further inheritance. */
3706                                 new_ace[i].flags &=
3707                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3708                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3709                         }
3710                 } else {
3711                         /*
3712                          * Strip off any container or inherit
3713                          * flags, they can't apply to objects.
3714                          */
3715                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3716                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3717                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3718                 }
3719                 i++;
3720
3721                 DEBUG(10,("append_parent_acl: path %s "
3722                         "inheriting ACE with sid %s "
3723                         "from parent %s\n",
3724                         fsp_str_dbg(fsp),
3725                         sid_string_dbg(&se->trustee),
3726                         parent_name));
3727         }
3728
3729         psd->dacl->aces = new_ace;
3730         psd->dacl->num_aces = i;
3731         psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3732                          SE_DESC_DACL_AUTO_INHERIT_REQ);
3733
3734         *pp_new_sd = psd;
3735         return status;
3736 }
3737 #endif
3738
3739 /****************************************************************************
3740  Reply to set a security descriptor on an fsp. security_info_sent is the
3741  description of the following NT ACL.
3742  This should be the only external function needed for the UNIX style set ACL.
3743 ****************************************************************************/
3744
3745 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd_orig)
3746 {
3747         connection_struct *conn = fsp->conn;
3748         uid_t user = (uid_t)-1;
3749         gid_t grp = (gid_t)-1;
3750         DOM_SID file_owner_sid;
3751         DOM_SID file_grp_sid;
3752         canon_ace *file_ace_list = NULL;
3753         canon_ace *dir_ace_list = NULL;
3754         bool acl_perms = False;
3755         mode_t orig_mode = (mode_t)0;
3756         NTSTATUS status;
3757         bool set_acl_as_root = false;
3758         bool acl_set_support = false;
3759         bool ret = false;
3760         SEC_DESC *psd = NULL;
3761
3762         DEBUG(10,("set_nt_acl: called for file %s\n",
3763                   fsp_str_dbg(fsp)));
3764
3765         if (!CAN_WRITE(conn)) {
3766                 DEBUG(10,("set acl rejected on read-only share\n"));
3767                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3768         }
3769
3770         if (!psd_orig) {
3771                 return NT_STATUS_INVALID_PARAMETER;
3772         }
3773
3774         psd = dup_sec_desc(talloc_tos(), psd_orig);
3775         if (!psd) {
3776                 return NT_STATUS_NO_MEMORY;
3777         }
3778
3779         /*
3780          * Get the current state of the file.
3781          */
3782
3783         status = vfs_stat_fsp(fsp);
3784         if (!NT_STATUS_IS_OK(status)) {
3785                 return status;
3786         }
3787
3788         /* Save the original element we check against. */
3789         orig_mode = fsp->fsp_name->st.st_ex_mode;
3790
3791         /*
3792          * Unpack the user/group/world id's.
3793          */
3794
3795         /* POSIX can't cope with missing owner/group. */
3796         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3797                 security_info_sent &= ~SECINFO_OWNER;
3798         }
3799         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3800                 security_info_sent &= ~SECINFO_GROUP;
3801         }
3802
3803         status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3804         if (!NT_STATUS_IS_OK(status)) {
3805                 return status;
3806         }
3807
3808         /*
3809          * Do we need to chown ? If so this must be done first as the incoming
3810          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3811          * Noticed by Simo.
3812          */
3813
3814         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3815             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3816
3817                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3818                          fsp_str_dbg(fsp), (unsigned int)user,
3819                          (unsigned int)grp));
3820
3821                 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3822                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3823                                  "= %s.\n", fsp_str_dbg(fsp),
3824                                  (unsigned int)user, (unsigned int)grp,
3825                                  strerror(errno)));
3826                         if (errno == EPERM) {
3827                                 return NT_STATUS_INVALID_OWNER;
3828                         }
3829                         return map_nt_error_from_unix(errno);
3830                 }
3831
3832                 /*
3833                  * Recheck the current state of the file, which may have changed.
3834                  * (suid/sgid bits, for instance)
3835                  */
3836
3837                 status = vfs_stat_fsp(fsp);
3838                 if (!NT_STATUS_IS_OK(status)) {
3839                         return status;
3840                 }
3841
3842                 /* Save the original element we check against. */
3843                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3844
3845                 /* If we successfully chowned, we know we must
3846                  * be able to set the acl, so do it as root.
3847                  */
3848                 set_acl_as_root = true;
3849         }
3850
3851         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3852
3853         if((security_info_sent & SECINFO_DACL) &&
3854                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3855                         (psd->dacl == NULL)) {
3856                 SEC_ACE ace[3];
3857
3858                 /* We can't have NULL DACL in POSIX.
3859                    Use owner/group/Everyone -> full access. */
3860
3861                 init_sec_ace(&ace[0],
3862                                 &file_owner_sid,
3863                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3864                                 GENERIC_ALL_ACCESS,
3865                                 0);
3866                 init_sec_ace(&ace[1],
3867                                 &file_grp_sid,
3868                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3869                                 GENERIC_ALL_ACCESS,
3870                                 0);
3871                 init_sec_ace(&ace[2],
3872                                 &global_sid_World,
3873                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3874                                 GENERIC_ALL_ACCESS,
3875                                 0);
3876                 psd->dacl = make_sec_acl(talloc_tos(),
3877                                         NT4_ACL_REVISION,
3878                                         3,
3879                                         ace);
3880                 if (psd->dacl == NULL) {
3881                         return NT_STATUS_NO_MEMORY;
3882                 }
3883                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3884         }
3885
3886         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3887                                      &file_grp_sid, &file_ace_list,
3888                                      &dir_ace_list, security_info_sent, psd);
3889
3890         /* Ignore W2K traverse DACL set. */
3891         if (!file_ace_list && !dir_ace_list) {
3892                 return NT_STATUS_OK;
3893         }
3894
3895         if (!acl_perms) {
3896                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3897                 free_canon_ace_list(file_ace_list);
3898                 free_canon_ace_list(dir_ace_list);
3899                 return NT_STATUS_ACCESS_DENIED;
3900         }
3901
3902         /*
3903          * Only change security if we got a DACL.
3904          */
3905
3906         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3907                 free_canon_ace_list(file_ace_list);
3908                 free_canon_ace_list(dir_ace_list);
3909                 return NT_STATUS_OK;
3910         }
3911
3912         /*
3913          * Try using the POSIX ACL set first. Fall back to chmod if
3914          * we have no ACL support on this filesystem.
3915          */
3916
3917         if (acl_perms && file_ace_list) {
3918                 if (set_acl_as_root) {
3919                         become_root();
3920                 }
3921                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3922                                          &fsp->fsp_name->st, &acl_set_support);
3923                 if (set_acl_as_root) {
3924                         unbecome_root();
3925                 }
3926                 if (acl_set_support && ret == false) {
3927                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3928                                  "%s (%s).\n", fsp_str_dbg(fsp),
3929                                  strerror(errno)));
3930                         free_canon_ace_list(file_ace_list);
3931                         free_canon_ace_list(dir_ace_list);
3932                         return map_nt_error_from_unix(errno);
3933                 }
3934         }
3935
3936         if (acl_perms && acl_set_support && fsp->is_directory) {
3937                 if (dir_ace_list) {
3938                         if (set_acl_as_root) {
3939                                 become_root();
3940                         }
3941                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
3942                                                  &fsp->fsp_name->st,
3943                                                  &acl_set_support);
3944                         if (set_acl_as_root) {
3945                                 unbecome_root();
3946                         }
3947                         if (ret == false) {
3948                                 DEBUG(3,("set_nt_acl: failed to set default "
3949                                          "acl on directory %s (%s).\n",
3950                                          fsp_str_dbg(fsp), 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                 } else {
3956                         int sret = -1;
3957
3958                         /*
3959                          * No default ACL - delete one if it exists.
3960                          */
3961
3962                         if (set_acl_as_root) {
3963                                 become_root();
3964                         }
3965                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3966                             fsp->fsp_name->base_name);
3967                         if (set_acl_as_root) {
3968                                 unbecome_root();
3969                         }
3970                         if (sret == -1) {
3971                                 if (acl_group_override(conn, fsp->fsp_name)) {
3972                                         DEBUG(5,("set_nt_acl: acl group "
3973                                                  "control on and current user "
3974                                                  "in file %s primary group. "
3975                                                  "Override delete_def_acl\n",
3976                                                  fsp_str_dbg(fsp)));
3977
3978                                         become_root();
3979                                         sret =
3980                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3981                                                     conn,
3982                                                     fsp->fsp_name->base_name);
3983                                         unbecome_root();
3984                                 }
3985
3986                                 if (sret == -1) {
3987                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3988                                         free_canon_ace_list(file_ace_list);
3989                                         free_canon_ace_list(dir_ace_list);
3990                                         return map_nt_error_from_unix(errno);
3991                                 }
3992                         }
3993                 }
3994         }
3995
3996         if (acl_set_support) {
3997                 if (set_acl_as_root) {
3998                         become_root();
3999                 }
4000                 store_inheritance_attributes(fsp,
4001                                 file_ace_list,
4002                                 dir_ace_list,
4003                                 psd->type);
4004                 if (set_acl_as_root) {
4005                         unbecome_root();
4006                 }
4007         }
4008
4009         /*
4010          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4011          */
4012
4013         if(!acl_set_support && acl_perms) {
4014                 mode_t posix_perms;
4015
4016                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4017                         free_canon_ace_list(file_ace_list);
4018                         free_canon_ace_list(dir_ace_list);
4019                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4020                                  "posix permissions for file %s.\n",
4021                                  fsp_str_dbg(fsp)));
4022                         return NT_STATUS_ACCESS_DENIED;
4023                 }
4024
4025                 if (orig_mode != posix_perms) {
4026                         int sret = -1;
4027
4028                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4029                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4030
4031                         if (set_acl_as_root) {
4032                                 become_root();
4033                         }
4034                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4035                                              posix_perms);
4036                         if (set_acl_as_root) {
4037                                 unbecome_root();
4038                         }
4039                         if(sret == -1) {
4040                                 if (acl_group_override(conn, fsp->fsp_name)) {
4041                                         DEBUG(5,("set_nt_acl: acl group "
4042                                                  "control on and current user "
4043                                                  "in file %s primary group. "
4044                                                  "Override chmod\n",
4045                                                  fsp_str_dbg(fsp)));
4046
4047                                         become_root();
4048                                         sret = SMB_VFS_CHMOD(conn,
4049                                             fsp->fsp_name->base_name,
4050                                             posix_perms);
4051                                         unbecome_root();
4052                                 }
4053
4054                                 if (sret == -1) {
4055                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4056                                                  "failed. Error = %s.\n",
4057                                                  fsp_str_dbg(fsp),
4058                                                  (unsigned int)posix_perms,
4059                                                  strerror(errno)));
4060                                         free_canon_ace_list(file_ace_list);
4061                                         free_canon_ace_list(dir_ace_list);
4062                                         return map_nt_error_from_unix(errno);
4063                                 }
4064                         }
4065                 }
4066         }
4067
4068         free_canon_ace_list(file_ace_list);
4069         free_canon_ace_list(dir_ace_list);
4070
4071         /* Ensure the stat struct in the fsp is correct. */
4072         status = vfs_stat_fsp(fsp);
4073
4074         return NT_STATUS_OK;
4075 }
4076
4077 /****************************************************************************
4078  Get the actual group bits stored on a file with an ACL. Has no effect if
4079  the file has no ACL. Needed in dosmode code where the stat() will return
4080  the mask bits, not the real group bits, for a file with an ACL.
4081 ****************************************************************************/
4082
4083 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4084 {
4085         int entry_id = SMB_ACL_FIRST_ENTRY;
4086         SMB_ACL_ENTRY_T entry;
4087         SMB_ACL_T posix_acl;
4088         int result = -1;
4089
4090         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4091         if (posix_acl == (SMB_ACL_T)NULL)
4092                 return -1;
4093
4094         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4095                 SMB_ACL_TAG_T tagtype;
4096                 SMB_ACL_PERMSET_T permset;
4097
4098                 entry_id = SMB_ACL_NEXT_ENTRY;
4099
4100                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4101                         break;
4102
4103                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4104                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4105                                 break;
4106                         } else {
4107                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4108                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4109                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4110                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4111                                 result = 0;
4112                                 break;
4113                         }
4114                 }
4115         }
4116         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4117         return result;
4118 }
4119
4120 /****************************************************************************
4121  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4122  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4123 ****************************************************************************/
4124
4125 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4126 {
4127         int entry_id = SMB_ACL_FIRST_ENTRY;
4128         SMB_ACL_ENTRY_T entry;
4129         int num_entries = 0;
4130
4131         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4132                 SMB_ACL_TAG_T tagtype;
4133                 SMB_ACL_PERMSET_T permset;
4134                 mode_t perms;
4135
4136                 entry_id = SMB_ACL_NEXT_ENTRY;
4137
4138                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4139                         return -1;
4140
4141                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4142                         return -1;
4143
4144                 num_entries++;
4145
4146                 switch(tagtype) {
4147                         case SMB_ACL_USER_OBJ:
4148                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4149                                 break;
4150                         case SMB_ACL_GROUP_OBJ:
4151                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4152                                 break;
4153                         case SMB_ACL_MASK:
4154                                 /*
4155                                  * FIXME: The ACL_MASK entry permissions should really be set to
4156                                  * the union of the permissions of all ACL_USER,
4157                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4158                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4159                                  */
4160                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4161                                 break;
4162                         case SMB_ACL_OTHER:
4163                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4164                                 break;
4165                         default:
4166                                 continue;
4167                 }
4168
4169                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4170                         return -1;
4171
4172                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4173                         return -1;
4174         }
4175
4176         /*
4177          * If this is a simple 3 element ACL or no elements then it's a standard
4178          * UNIX permission set. Just use chmod...
4179          */
4180
4181         if ((num_entries == 3) || (num_entries == 0))
4182                 return -1;
4183
4184         return 0;
4185 }
4186
4187 /****************************************************************************
4188  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4189  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4190  resulting ACL on TO.  Note that name is in UNIX character set.
4191 ****************************************************************************/
4192
4193 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4194 {
4195         SMB_ACL_T posix_acl = NULL;
4196         int ret = -1;
4197
4198         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4199                 return -1;
4200
4201         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4202                 goto done;
4203
4204         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4205
4206  done:
4207
4208         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4209         return ret;
4210 }
4211
4212 /****************************************************************************
4213  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4214  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4215  Note that name is in UNIX character set.
4216 ****************************************************************************/
4217
4218 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4219 {
4220         return copy_access_posix_acl(conn, name, name, mode);
4221 }
4222
4223 /****************************************************************************
4224  Check for an existing default POSIX ACL on a directory.
4225 ****************************************************************************/
4226
4227 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4228 {
4229         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4230         bool has_acl = False;
4231         SMB_ACL_ENTRY_T entry;
4232
4233         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4234                 has_acl = True;
4235         }
4236
4237         if (def_acl) {
4238                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4239         }
4240         return has_acl;
4241 }
4242
4243 /****************************************************************************
4244  If the parent directory has no default ACL but it does have an Access ACL,
4245  inherit this Access ACL to file name.
4246 ****************************************************************************/
4247
4248 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4249                        const char *name, mode_t mode)
4250 {
4251         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4252                 return 0;
4253
4254         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4255 }
4256
4257 /****************************************************************************
4258  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4259  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4260 ****************************************************************************/
4261
4262 int fchmod_acl(files_struct *fsp, mode_t mode)
4263 {
4264         connection_struct *conn = fsp->conn;
4265         SMB_ACL_T posix_acl = NULL;
4266         int ret = -1;
4267
4268         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4269                 return -1;
4270
4271         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4272                 goto done;
4273
4274         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4275
4276   done:
4277
4278         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4279         return ret;
4280 }
4281
4282 /****************************************************************************
4283  Map from wire type to permset.
4284 ****************************************************************************/
4285
4286 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4287 {
4288         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4289                 return False;
4290         }
4291
4292         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4293                 return False;
4294         }
4295
4296         if (wire_perm & SMB_POSIX_ACL_READ) {
4297                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4298                         return False;
4299                 }
4300         }
4301         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4302                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4303                         return False;
4304                 }
4305         }
4306         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4307                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4308                         return False;
4309                 }
4310         }
4311         return True;
4312 }
4313
4314 /****************************************************************************
4315  Map from wire type to tagtype.
4316 ****************************************************************************/
4317
4318 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4319 {
4320         switch (wire_tt) {
4321                 case SMB_POSIX_ACL_USER_OBJ:
4322                         *p_tt = SMB_ACL_USER_OBJ;
4323                         break;
4324                 case SMB_POSIX_ACL_USER:
4325                         *p_tt = SMB_ACL_USER;
4326                         break;
4327                 case SMB_POSIX_ACL_GROUP_OBJ:
4328                         *p_tt = SMB_ACL_GROUP_OBJ;
4329                         break;
4330                 case SMB_POSIX_ACL_GROUP:
4331                         *p_tt = SMB_ACL_GROUP;
4332                         break;
4333                 case SMB_POSIX_ACL_MASK:
4334                         *p_tt = SMB_ACL_MASK;
4335                         break;
4336                 case SMB_POSIX_ACL_OTHER:
4337                         *p_tt = SMB_ACL_OTHER;
4338                         break;
4339                 default:
4340                         return False;
4341         }
4342         return True;
4343 }
4344
4345 /****************************************************************************
4346  Create a new POSIX acl from wire permissions.
4347  FIXME ! How does the share mask/mode fit into this.... ?
4348 ****************************************************************************/
4349
4350 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4351 {
4352         unsigned int i;
4353         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4354
4355         if (the_acl == NULL) {
4356                 return NULL;
4357         }
4358
4359         for (i = 0; i < num_acls; i++) {
4360                 SMB_ACL_ENTRY_T the_entry;
4361                 SMB_ACL_PERMSET_T the_permset;
4362                 SMB_ACL_TAG_T tag_type;
4363
4364                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4365                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4366                                 i, strerror(errno) ));
4367                         goto fail;
4368                 }
4369
4370                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4371                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4372                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4373                         goto fail;
4374                 }
4375
4376                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4377                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4378                                 i, strerror(errno) ));
4379                         goto fail;
4380                 }
4381
4382                 /* Get the permset pointer from the new ACL entry. */
4383                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4384                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4385                                 i, strerror(errno) ));
4386                         goto fail;
4387                 }
4388
4389                 /* Map from wire to permissions. */
4390                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4391                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4392                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4393                         goto fail;
4394                 }
4395
4396                 /* Now apply to the new ACL entry. */
4397                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4398                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4399                                 i, strerror(errno) ));
4400                         goto fail;
4401                 }
4402
4403                 if (tag_type == SMB_ACL_USER) {
4404                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4405                         uid_t uid = (uid_t)uidval;
4406                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4407                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4408                                         (unsigned int)uid, i, strerror(errno) ));
4409                                 goto fail;
4410                         }
4411                 }
4412
4413                 if (tag_type == SMB_ACL_GROUP) {
4414                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4415                         gid_t gid = (uid_t)gidval;
4416                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4417                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4418                                         (unsigned int)gid, i, strerror(errno) ));
4419                                 goto fail;
4420                         }
4421                 }
4422         }
4423
4424         return the_acl;
4425
4426  fail:
4427
4428         if (the_acl != NULL) {
4429                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4430         }
4431         return NULL;
4432 }
4433
4434 /****************************************************************************
4435  Calls from UNIX extensions - Default POSIX ACL set.
4436  If num_def_acls == 0 and not a directory just return. If it is a directory
4437  and num_def_acls == 0 then remove the default acl. Else set the default acl
4438  on the directory.
4439 ****************************************************************************/
4440
4441 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4442                                 uint16 num_def_acls, const char *pdata)
4443 {
4444         SMB_ACL_T def_acl = NULL;
4445
4446         if (!S_ISDIR(psbuf->st_ex_mode)) {
4447                 if (num_def_acls) {
4448                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4449                         errno = EISDIR;
4450                         return False;
4451                 } else {
4452                         return True;
4453                 }
4454         }
4455
4456         if (!num_def_acls) {
4457                 /* Remove the default ACL. */
4458                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4459                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4460                                 fname, strerror(errno) ));
4461                         return False;
4462                 }
4463                 return True;
4464         }
4465
4466         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4467                 return False;
4468         }
4469
4470         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4471                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4472                         fname, strerror(errno) ));
4473                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4474                 return False;
4475         }
4476
4477         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4478         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4479         return True;
4480 }
4481
4482 /****************************************************************************
4483  Remove an ACL from a file. As we don't have acl_delete_entry() available
4484  we must read the current acl and copy all entries except MASK, USER and GROUP
4485  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4486  removed.
4487  FIXME ! How does the share mask/mode fit into this.... ?
4488 ****************************************************************************/
4489
4490 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4491 {
4492         SMB_ACL_T file_acl = NULL;
4493         int entry_id = SMB_ACL_FIRST_ENTRY;
4494         SMB_ACL_ENTRY_T entry;
4495         bool ret = False;
4496         /* Create a new ACL with only 3 entries, u/g/w. */
4497         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4498         SMB_ACL_ENTRY_T user_ent = NULL;
4499         SMB_ACL_ENTRY_T group_ent = NULL;
4500         SMB_ACL_ENTRY_T other_ent = NULL;
4501
4502         if (new_file_acl == NULL) {
4503                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4504                 return False;
4505         }
4506
4507         /* Now create the u/g/w entries. */
4508         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4509                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4510                         fname, strerror(errno) ));
4511                 goto done;
4512         }
4513         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4514                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4515                         fname, strerror(errno) ));
4516                 goto done;
4517         }
4518
4519         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4520                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4521                         fname, strerror(errno) ));
4522                 goto done;
4523         }
4524         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4525                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4526                         fname, strerror(errno) ));
4527                 goto done;
4528         }
4529
4530         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4531                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4532                         fname, strerror(errno) ));
4533                 goto done;
4534         }
4535         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4536                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4537                         fname, strerror(errno) ));
4538                 goto done;
4539         }
4540
4541         /* Get the current file ACL. */
4542         if (fsp && fsp->fh->fd != -1) {
4543                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4544         } else {
4545                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4546         }
4547
4548         if (file_acl == NULL) {
4549                 /* This is only returned if an error occurred. Even for a file with
4550                    no acl a u/g/w acl should be returned. */
4551                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4552                         fname, strerror(errno) ));
4553                 goto done;
4554         }
4555
4556         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4557                 SMB_ACL_TAG_T tagtype;
4558                 SMB_ACL_PERMSET_T permset;
4559
4560                 entry_id = SMB_ACL_NEXT_ENTRY;
4561
4562                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4563                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4564                                 fname, strerror(errno) ));
4565                         goto done;
4566                 }
4567
4568                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4569                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4570                                 fname, strerror(errno) ));
4571                         goto done;
4572                 }
4573
4574                 if (tagtype == SMB_ACL_USER_OBJ) {
4575                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4576                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4577                                         fname, strerror(errno) ));
4578                         }
4579                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4580                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4581                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4582                                         fname, strerror(errno) ));
4583                         }
4584                 } else if (tagtype == SMB_ACL_OTHER) {
4585                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4586                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4587                                         fname, strerror(errno) ));
4588                         }
4589                 }
4590         }
4591
4592         /* Set the new empty file ACL. */
4593         if (fsp && fsp->fh->fd != -1) {
4594                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4595                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4596                                 fname, strerror(errno) ));
4597                         goto done;
4598                 }
4599         } else {
4600                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4601                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4602                                 fname, strerror(errno) ));
4603                         goto done;
4604                 }
4605         }
4606
4607         ret = True;
4608
4609  done:
4610
4611         if (file_acl) {
4612                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4613         }
4614         if (new_file_acl) {
4615                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4616         }
4617         return ret;
4618 }
4619
4620 /****************************************************************************
4621  Calls from UNIX extensions - POSIX ACL set.
4622  If num_def_acls == 0 then read/modify/write acl after removing all entries
4623  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4624 ****************************************************************************/
4625
4626 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4627 {
4628         SMB_ACL_T file_acl = NULL;
4629
4630         if (!num_acls) {
4631                 /* Remove the ACL from the file. */
4632                 return remove_posix_acl(conn, fsp, fname);
4633         }
4634
4635         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4636                 return False;
4637         }
4638
4639         if (fsp && fsp->fh->fd != -1) {
4640                 /* The preferred way - use an open fd. */
4641                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4642                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4643                                 fname, strerror(errno) ));
4644                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4645                         return False;
4646                 }
4647         } else {
4648                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4649                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4650                                 fname, strerror(errno) ));
4651                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4652                         return False;
4653                 }
4654         }
4655
4656         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4657         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4658         return True;
4659 }
4660
4661 /********************************************************************
4662  Pull the NT ACL from a file on disk or the OpenEventlog() access
4663  check.  Caller is responsible for freeing the returned security
4664  descriptor via TALLOC_FREE().  This is designed for dealing with
4665  user space access checks in smbd outside of the VFS.  For example,
4666  checking access rights in OpenEventlog().
4667
4668  Assume we are dealing with files (for now)
4669 ********************************************************************/
4670
4671 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4672 {
4673         SEC_DESC *psd, *ret_sd;
4674         connection_struct *conn;
4675         files_struct finfo;
4676         struct fd_handle fh;
4677         NTSTATUS status;
4678
4679         conn = TALLOC_ZERO_P(ctx, connection_struct);
4680         if (conn == NULL) {
4681                 DEBUG(0, ("talloc failed\n"));
4682                 return NULL;
4683         }
4684
4685         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4686                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4687                 TALLOC_FREE(conn);
4688                 return NULL;
4689         }
4690
4691         conn->params->service = -1;
4692
4693         set_conn_connectpath(conn, "/");
4694
4695         if (!smbd_vfs_init(conn)) {
4696                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4697                 conn_free(conn);
4698                 return NULL;
4699         }
4700
4701         ZERO_STRUCT( finfo );
4702         ZERO_STRUCT( fh );
4703
4704         finfo.fnum = -1;
4705         finfo.conn = conn;
4706         finfo.fh = &fh;
4707         finfo.fh->fd = -1;
4708
4709         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4710                                             &finfo.fsp_name);
4711         if (!NT_STATUS_IS_OK(status)) {
4712                 conn_free(conn);
4713                 return NULL;
4714         }
4715
4716         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4717                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4718                 TALLOC_FREE(finfo.fsp_name);
4719                 conn_free(conn);
4720                 return NULL;
4721         }
4722
4723         ret_sd = dup_sec_desc( ctx, psd );
4724
4725         TALLOC_FREE(finfo.fsp_name);
4726         conn_free(conn);
4727
4728         return ret_sd;
4729 }
4730
4731 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4732
4733 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4734                                         const char *name,
4735                                         SMB_STRUCT_STAT *psbuf,
4736                                         SEC_DESC **ppdesc)
4737 {
4738         struct dom_sid owner_sid, group_sid;
4739         size_t size = 0;
4740         SEC_ACE aces[4];
4741         uint32_t access_mask = 0;
4742         mode_t mode = psbuf->st_ex_mode;
4743         SEC_ACL *new_dacl = NULL;
4744         int idx = 0;
4745
4746         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4747                 name, (int)mode ));
4748
4749         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4750         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4751
4752         /*
4753          We provide up to 4 ACEs
4754                 - Owner
4755                 - Group
4756                 - Everyone
4757                 - NT System
4758         */
4759
4760         if (mode & S_IRUSR) {
4761                 if (mode & S_IWUSR) {
4762                         access_mask |= SEC_RIGHTS_FILE_ALL;
4763                 } else {
4764                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4765                 }
4766         }
4767         if (mode & S_IWUSR) {
4768                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4769         }
4770
4771         init_sec_ace(&aces[idx],
4772                         &owner_sid,
4773                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4774                         access_mask,
4775                         0);
4776         idx++;
4777
4778         access_mask = 0;
4779         if (mode & S_IRGRP) {
4780                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4781         }
4782         if (mode & S_IWGRP) {
4783                 /* note that delete is not granted - this matches posix behaviour */
4784                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4785         }
4786         if (access_mask) {
4787                 init_sec_ace(&aces[idx],
4788                         &group_sid,
4789                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4790                         access_mask,
4791                         0);
4792                 idx++;
4793         }
4794
4795         access_mask = 0;
4796         if (mode & S_IROTH) {
4797                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4798         }
4799         if (mode & S_IWOTH) {
4800                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4801         }
4802         if (access_mask) {
4803                 init_sec_ace(&aces[idx],
4804                         &global_sid_World,
4805                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4806                         access_mask,
4807                         0);
4808                 idx++;
4809         }
4810
4811         init_sec_ace(&aces[idx],
4812                         &global_sid_System,
4813                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4814                         SEC_RIGHTS_FILE_ALL,
4815                         0);
4816         idx++;
4817
4818         new_dacl = make_sec_acl(ctx,
4819                         NT4_ACL_REVISION,
4820                         idx,
4821                         aces);
4822
4823         if (!new_dacl) {
4824                 return NT_STATUS_NO_MEMORY;
4825         }
4826
4827         *ppdesc = make_sec_desc(ctx,
4828                         SECURITY_DESCRIPTOR_REVISION_1,
4829                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4830                         &owner_sid,
4831                         &group_sid,
4832                         NULL,
4833                         new_dacl,
4834                         &size);
4835         if (!*ppdesc) {
4836                 return NT_STATUS_NO_MEMORY;
4837         }
4838         return NT_STATUS_OK;
4839 }