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 #include "../libcli/security/security.h"
  24
  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         struct 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                         SEC_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, struct dom_sid *powner_sid, struct 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 = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 949                                                 (curr_ace->attr == curr_ace_outer->attr));
 950                         } else {
 951                                 can_merge = (dom_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 (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1001                                 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1002
1003                                 if( DEBUGLVL( 10 )) {
1004                                         dbgtext("merge_aces: Masking ACE's\n");
1005                                         print_canon_ace( curr_ace_outer, 0);
1006                                         print_canon_ace( curr_ace, 0);
1007                                 }
1008
1009                                 curr_ace->perms &= ~curr_ace_outer->perms;
1010
1011                                 if (curr_ace->perms == 0) {
1012
1013                                         /*
1014                                          * The deny overrides the allow. Remove the allow.
1015                                          */
1016
1017                                         DLIST_REMOVE(l_head, curr_ace);
1018                                         SAFE_FREE(curr_ace);
1019                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1020
1021                                 } else {
1022
1023                                         /*
1024                                          * Even after removing permissions, there
1025                                          * are still allow permissions - delete the deny.
1026                                          * It is safe to delete the deny here,
1027                                          * as we are guarenteed by the deny first
1028                                          * ordering that all the deny entries for
1029                                          * this SID have already been merged into one
1030                                          * before we can get to an allow ace.
1031                                          */
1032
1033                                         DLIST_REMOVE(l_head, curr_ace_outer);
1034                                         SAFE_FREE(curr_ace_outer);
1035                                         break;
1036                                 }
1037                         }
1038
1039                 } /* end for curr_ace */
1040         } /* end for curr_ace_outer */
1041
1042         /* We may have modified the list. */
1043
1044         *pp_list_head = l_head;
1045 }
1046
1047 /****************************************************************************
1048  Check if we need to return NT4.x compatible ACL entries.
1049 ****************************************************************************/
1050
1051 bool nt4_compatible_acls(void)
1052 {
1053         int compat = lp_acl_compatibility();
1054
1055         if (compat == ACL_COMPAT_AUTO) {
1056                 enum remote_arch_types ra_type = get_remote_arch();
1057
1058                 /* Automatically adapt to client */
1059                 return (ra_type <= RA_WINNT);
1060         } else
1061                 return (compat == ACL_COMPAT_WINNT);
1062 }
1063
1064
1065 /****************************************************************************
1066  Map canon_ace perms to permission bits NT.
1067  The attr element is not used here - we only process deny entries on set,
1068  not get. Deny entries are implicit on get with ace->perms = 0.
1069 ****************************************************************************/
1070
1071 uint32_t map_canon_ace_perms(int snum,
1072                                 enum security_ace_type *pacl_type,
1073                                 mode_t perms,
1074                                 bool directory_ace)
1075 {
1076         uint32_t nt_mask = 0;
1077
1078         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1079
1080         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1081                 if (directory_ace) {
1082                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1083                 } else {
1084                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1085                 }
1086         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1087                 /*
1088                  * Windows NT refuses to display ACEs with no permissions in them (but
1089                  * they are perfectly legal with Windows 2000). If the ACE has empty
1090                  * permissions we cannot use 0, so we use the otherwise unused
1091                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1092                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1093                  * to be changed in the future.
1094                  */
1095
1096                 if (nt4_compatible_acls())
1097                         nt_mask = UNIX_ACCESS_NONE;
1098                 else
1099                         nt_mask = 0;
1100         } else {
1101                 if (directory_ace) {
1102                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1103                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1104                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1105                 } else {
1106                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1107                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1108                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1109                 }
1110         }
1111
1112         if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1113                 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1114         }
1115
1116         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1117                         (unsigned int)perms, (unsigned int)nt_mask ));
1118
1119         return nt_mask;
1120 }
1121
1122 /****************************************************************************
1123  Map NT perms to a UNIX mode_t.
1124 ****************************************************************************/
1125
1126 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
1127 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
1128 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1129
1130 static mode_t map_nt_perms( uint32 *mask, int type)
1131 {
1132         mode_t mode = 0;
1133
1134         switch(type) {
1135         case S_IRUSR:
1136                 if((*mask) & GENERIC_ALL_ACCESS)
1137                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1138                 else {
1139                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1140                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1141                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1142                 }
1143                 break;
1144         case S_IRGRP:
1145                 if((*mask) & GENERIC_ALL_ACCESS)
1146                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1147                 else {
1148                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1149                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1150                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1151                 }
1152                 break;
1153         case S_IROTH:
1154                 if((*mask) & GENERIC_ALL_ACCESS)
1155                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1156                 else {
1157                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1158                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1159                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1160                 }
1161                 break;
1162         }
1163
1164         return mode;
1165 }
1166
1167 /****************************************************************************
1168  Unpack a struct security_descriptor into a UNIX owner and group.
1169 ****************************************************************************/
1170
1171 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1172                         uid_t *puser, gid_t *pgrp,
1173                         uint32 security_info_sent, const struct
1174                         security_descriptor *psd)
1175 {
1176         struct dom_sid owner_sid;
1177         struct dom_sid grp_sid;
1178
1179         *puser = (uid_t)-1;
1180         *pgrp = (gid_t)-1;
1181
1182         if(security_info_sent == 0) {
1183                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1184                 return NT_STATUS_OK;
1185         }
1186
1187         /*
1188          * Validate the owner and group SID's.
1189          */
1190
1191         memset(&owner_sid, '\0', sizeof(owner_sid));
1192         memset(&grp_sid, '\0', sizeof(grp_sid));
1193
1194         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1195
1196         /*
1197          * Don't immediately fail if the owner sid cannot be validated.
1198          * This may be a group chown only set.
1199          */
1200
1201         if (security_info_sent & SECINFO_OWNER) {
1202                 sid_copy(&owner_sid, psd->owner_sid);
1203                 if (!sid_to_uid(&owner_sid, puser)) {
1204                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1205                                 /* this allows take ownership to work
1206                                  * reasonably */
1207                                 *puser = get_current_uid(conn);
1208                         } else {
1209                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1210                                          " owner sid for %s\n",
1211                                          sid_string_dbg(&owner_sid)));
1212                                 return NT_STATUS_INVALID_OWNER;
1213                         }
1214                 }
1215                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1216                          (unsigned int)*puser ));
1217         }
1218
1219         /*
1220          * Don't immediately fail if the group sid cannot be validated.
1221          * This may be an owner chown only set.
1222          */
1223
1224         if (security_info_sent & SECINFO_GROUP) {
1225                 sid_copy(&grp_sid, psd->group_sid);
1226                 if (!sid_to_gid( &grp_sid, pgrp)) {
1227                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1228                                 /* this allows take group ownership to work
1229                                  * reasonably */
1230                                 *pgrp = get_current_gid(conn);
1231                         } else {
1232                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1233                                          " group sid.\n"));
1234                                 return NT_STATUS_INVALID_OWNER;
1235                         }
1236                 }
1237                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1238                          (unsigned int)*pgrp));
1239         }
1240
1241         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1242
1243         return NT_STATUS_OK;
1244 }
1245
1246 /****************************************************************************
1247  Ensure the enforced permissions for this share apply.
1248 ****************************************************************************/
1249
1250 static void apply_default_perms(const struct share_params *params,
1251                                 const bool is_directory, canon_ace *pace,
1252                                 mode_t type)
1253 {
1254         mode_t and_bits = (mode_t)0;
1255         mode_t or_bits = (mode_t)0;
1256
1257         /* Get the initial bits to apply. */
1258
1259         if (is_directory) {
1260                 and_bits = lp_dir_security_mask(params->service);
1261                 or_bits = lp_force_dir_security_mode(params->service);
1262         } else {
1263                 and_bits = lp_security_mask(params->service);
1264                 or_bits = lp_force_security_mode(params->service);
1265         }
1266
1267         /* Now bounce them into the S_USR space. */
1268         switch(type) {
1269         case S_IRUSR:
1270                 /* Ensure owner has read access. */
1271                 pace->perms |= S_IRUSR;
1272                 if (is_directory)
1273                         pace->perms |= (S_IWUSR|S_IXUSR);
1274                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1275                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1276                 break;
1277         case S_IRGRP:
1278                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1279                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1280                 break;
1281         case S_IROTH:
1282                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1283                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1284                 break;
1285         }
1286
1287         pace->perms = ((pace->perms & and_bits)|or_bits);
1288 }
1289
1290 /****************************************************************************
1291  Check if a given uid/SID is in a group gid/SID. This is probably very
1292  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1293 ****************************************************************************/
1294
1295 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1296 {
1297         const char *u_name = NULL;
1298
1299         /* "Everyone" always matches every uid. */
1300
1301         if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1302                 return True;
1303
1304         /*
1305          * if it's the current user, we already have the unix token
1306          * and don't need to do the complex user_in_group_sid() call
1307          */
1308         if (uid_ace->unix_ug.uid == get_current_uid(conn)) {
1309                 const UNIX_USER_TOKEN *curr_utok = NULL;
1310                 size_t i;
1311
1312                 if (group_ace->unix_ug.gid == get_current_gid(conn)) {
1313                         return True;
1314                 }
1315
1316                 curr_utok = get_current_utok(conn);
1317                 for (i=0; i < curr_utok->ngroups; i++) {
1318                         if (group_ace->unix_ug.gid == curr_utok->groups[i]) {
1319                                 return True;
1320                         }
1321                 }
1322         }
1323
1324         /* u_name talloc'ed off tos. */
1325         u_name = uidtoname(uid_ace->unix_ug.uid);
1326         if (!u_name) {
1327                 return False;
1328         }
1329
1330         /*
1331          * user_in_group_sid() uses create_token_from_username()
1332          * which creates an artificial NT token given just a username,
1333          * so this is not reliable for users from foreign domains
1334          * exported by winbindd!
1335          */
1336         return user_in_group_sid(u_name, &group_ace->trustee);
1337 }
1338
1339 /****************************************************************************
1340  A well formed POSIX file or default ACL has at least 3 entries, a
1341  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1342  In addition, the owner must always have at least read access.
1343  When using this call on get_acl, the pst struct is valid and contains
1344  the mode of the file. When using this call on set_acl, the pst struct has
1345  been modified to have a mode containing the default for this file or directory
1346  type.
1347 ****************************************************************************/
1348
1349 static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
1350                                      const struct share_params *params,
1351                                      const bool is_directory,
1352                                                         const struct dom_sid *pfile_owner_sid,
1353                                                         const struct dom_sid *pfile_grp_sid,
1354                                                         const SMB_STRUCT_STAT *pst,
1355                                                         bool setting_acl)
1356 {
1357         canon_ace *pace;
1358         bool got_user = False;
1359         bool got_grp = False;
1360         bool got_other = False;
1361         canon_ace *pace_other = NULL;
1362
1363         for (pace = *pp_ace; pace; pace = pace->next) {
1364                 if (pace->type == SMB_ACL_USER_OBJ) {
1365
1366                         if (setting_acl)
1367                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1368                         got_user = True;
1369
1370                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1371
1372                         /*
1373                          * Ensure create mask/force create mode is respected on set.
1374                          */
1375
1376                         if (setting_acl)
1377                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1378                         got_grp = True;
1379
1380                 } else if (pace->type == SMB_ACL_OTHER) {
1381
1382                         /*
1383                          * Ensure create mask/force create mode is respected on set.
1384                          */
1385
1386                         if (setting_acl)
1387                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1388                         got_other = True;
1389                         pace_other = pace;
1390                 }
1391         }
1392
1393         if (!got_user) {
1394                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1395                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1396                         return False;
1397                 }
1398
1399                 ZERO_STRUCTP(pace);
1400                 pace->type = SMB_ACL_USER_OBJ;
1401                 pace->owner_type = UID_ACE;
1402                 pace->unix_ug.uid = pst->st_ex_uid;
1403                 pace->trustee = *pfile_owner_sid;
1404                 pace->attr = ALLOW_ACE;
1405
1406                 if (setting_acl) {
1407                         /* See if the owning user is in any of the other groups in
1408                            the ACE. If so, OR in the permissions from that group. */
1409
1410                         bool group_matched = False;
1411                         canon_ace *pace_iter;
1412
1413                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1414                                 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1415                                         if (uid_entry_in_group(conn, pace, pace_iter)) {
1416                                                 pace->perms |= pace_iter->perms;
1417                                                 group_matched = True;
1418                                         }
1419                                 }
1420                         }
1421
1422                         /* If we only got an "everyone" perm, just use that. */
1423                         if (!group_matched) {
1424                                 if (got_other)
1425                                         pace->perms = pace_other->perms;
1426                                 else
1427                                         pace->perms = 0;
1428                         }
1429
1430                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1431                 } else {
1432                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1433                 }
1434
1435                 DLIST_ADD(*pp_ace, pace);
1436         }
1437
1438         if (!got_grp) {
1439                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1440                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1441                         return False;
1442                 }
1443
1444                 ZERO_STRUCTP(pace);
1445                 pace->type = SMB_ACL_GROUP_OBJ;
1446                 pace->owner_type = GID_ACE;
1447                 pace->unix_ug.uid = pst->st_ex_gid;
1448                 pace->trustee = *pfile_grp_sid;
1449                 pace->attr = ALLOW_ACE;
1450                 if (setting_acl) {
1451                         /* If we only got an "everyone" perm, just use that. */
1452                         if (got_other)
1453                                 pace->perms = pace_other->perms;
1454                         else
1455                                 pace->perms = 0;
1456                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1457                 } else {
1458                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1459                 }
1460
1461                 DLIST_ADD(*pp_ace, pace);
1462         }
1463
1464         if (!got_other) {
1465                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1466                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1467                         return False;
1468                 }
1469
1470                 ZERO_STRUCTP(pace);
1471                 pace->type = SMB_ACL_OTHER;
1472                 pace->owner_type = WORLD_ACE;
1473                 pace->unix_ug.world = -1;
1474                 pace->trustee = global_sid_World;
1475                 pace->attr = ALLOW_ACE;
1476                 if (setting_acl) {
1477                         pace->perms = 0;
1478                         apply_default_perms(params, is_directory, pace, S_IROTH);
1479                 } else
1480                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1481
1482                 DLIST_ADD(*pp_ace, pace);
1483         }
1484
1485         return True;
1486 }
1487
1488 /****************************************************************************
1489  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1490  If it does not have them, check if there are any entries where the trustee is the
1491  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1492 ****************************************************************************/
1493
1494 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1495 {
1496         bool got_user_obj, got_group_obj;
1497         canon_ace *current_ace;
1498         int i, entries;
1499
1500         entries = count_canon_ace_list(ace);
1501         got_user_obj = False;
1502         got_group_obj = False;
1503
1504         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1505                 if (current_ace->type == SMB_ACL_USER_OBJ)
1506                         got_user_obj = True;
1507                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1508                         got_group_obj = True;
1509         }
1510         if (got_user_obj && got_group_obj) {
1511                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1512                 return;
1513         }
1514
1515         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1516                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1517                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1518                         current_ace->type = SMB_ACL_USER_OBJ;
1519                         got_user_obj = True;
1520                 }
1521                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1522                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1523                         current_ace->type = SMB_ACL_GROUP_OBJ;
1524                         got_group_obj = True;
1525                 }
1526         }
1527         if (!got_user_obj)
1528                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1529         if (!got_group_obj)
1530                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1531 }
1532
1533 /****************************************************************************
1534  If an ACE entry is SMB_ACL_USER_OBJ and not CREATOR_OWNER, map to SMB_ACL_USER.
1535  If an ACE entry is SMB_ACL_GROUP_OBJ and not CREATOR_GROUP, map to SMB_ACL_GROUP
1536 ****************************************************************************/
1537
1538 static bool dup_owning_ace(canon_ace *dir_ace, canon_ace *ace)
1539 {
1540         /* dir ace must be followings.
1541            SMB_ACL_USER_OBJ : trustee(CREATOR_OWNER) -> Posix ACL d:u::perm
1542            SMB_ACL_USER     : not trustee    -> Posix ACL u:user:perm
1543            SMB_ACL_USER_OBJ : trustee -> convert to SMB_ACL_USER : trustee
1544            Posix ACL u:trustee:perm
1545
1546            SMB_ACL_GROUP_OBJ: trustee(CREATOR_GROUP) -> Posix ACL d:g::perm
1547            SMB_ACL_GROUP    : not trustee   -> Posix ACL g:group:perm
1548            SMB_ACL_GROUP_OBJ: trustee -> convert to SMB_ACL_GROUP : trustee
1549            Posix ACL g:trustee:perm
1550         */
1551
1552         if (ace->type == SMB_ACL_USER_OBJ &&
1553                         !(dom_sid_equal(&ace->trustee, &global_sid_Creator_Owner))) {
1554                 canon_ace *dup_ace = dup_canon_ace(ace);
1555
1556                 if (dup_ace == NULL) {
1557                         return false;
1558                 }
1559                 dup_ace->type = SMB_ACL_USER;
1560                 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1561         }
1562
1563         if (ace->type == SMB_ACL_GROUP_OBJ &&
1564                         !(dom_sid_equal(&ace->trustee, &global_sid_Creator_Group))) {
1565                 canon_ace *dup_ace = dup_canon_ace(ace);
1566
1567                 if (dup_ace == NULL) {
1568                         return false;
1569                 }
1570                 dup_ace->type = SMB_ACL_GROUP;
1571                 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1572         }
1573
1574         return true;
1575 }
1576
1577 /****************************************************************************
1578  Unpack a struct security_descriptor into two canonical ace lists.
1579 ****************************************************************************/
1580
1581 static bool create_canon_ace_lists(files_struct *fsp,
1582                                         const SMB_STRUCT_STAT *pst,
1583                                         struct dom_sid *pfile_owner_sid,
1584                                         struct dom_sid *pfile_grp_sid,
1585                                         canon_ace **ppfile_ace,
1586                                         canon_ace **ppdir_ace,
1587                                         const struct security_acl *dacl)
1588 {
1589         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1590         canon_ace *file_ace = NULL;
1591         canon_ace *dir_ace = NULL;
1592         canon_ace *current_ace = NULL;
1593         bool got_dir_allow = False;
1594         bool got_file_allow = False;
1595         int i, j;
1596
1597         *ppfile_ace = NULL;
1598         *ppdir_ace = NULL;
1599
1600         /*
1601          * Convert the incoming ACL into a more regular form.
1602          */
1603
1604         for(i = 0; i < dacl->num_aces; i++) {
1605                 struct security_ace *psa = &dacl->aces[i];
1606
1607                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1608                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1609                         return False;
1610                 }
1611
1612                 if (nt4_compatible_acls()) {
1613                         /*
1614                          * The security mask may be UNIX_ACCESS_NONE which should map into
1615                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1616                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1617                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1618                          */
1619
1620                         /*
1621                          * Convert GENERIC bits to specific bits.
1622                          */
1623
1624                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1625
1626                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1627
1628                         if(psa->access_mask != UNIX_ACCESS_NONE)
1629                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1630                 }
1631         }
1632
1633         /*
1634          * Deal with the fact that NT 4.x re-writes the canonical format
1635          * that we return for default ACLs. If a directory ACE is identical
1636          * to a inherited directory ACE then NT changes the bits so that the
1637          * first ACE is set to OI|IO and the second ACE for this SID is set
1638          * to CI. We need to repair this. JRA.
1639          */
1640
1641         for(i = 0; i < dacl->num_aces; i++) {
1642                 struct security_ace *psa1 = &dacl->aces[i];
1643
1644                 for (j = i + 1; j < dacl->num_aces; j++) {
1645                         struct security_ace *psa2 = &dacl->aces[j];
1646
1647                         if (psa1->access_mask != psa2->access_mask)
1648                                 continue;
1649
1650                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1651                                 continue;
1652
1653                         /*
1654                          * Ok - permission bits and SIDs are equal.
1655                          * Check if flags were re-written.
1656                          */
1657
1658                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1659
1660                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1661                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1662
1663                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1664
1665                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1666                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1667
1668                         }
1669                 }
1670         }
1671
1672         for(i = 0; i < dacl->num_aces; i++) {
1673                 struct security_ace *psa = &dacl->aces[i];
1674
1675                 /*
1676                  * Create a canon_ace entry representing this NT DACL ACE.
1677                  */
1678
1679                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1680                         free_canon_ace_list(file_ace);
1681                         free_canon_ace_list(dir_ace);
1682                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1683                         return False;
1684                 }
1685
1686                 ZERO_STRUCTP(current_ace);
1687
1688                 sid_copy(&current_ace->trustee, &psa->trustee);
1689
1690                 /*
1691                  * Try and work out if the SID is a user or group
1692                  * as we need to flag these differently for POSIX.
1693                  * Note what kind of a POSIX ACL this should map to.
1694                  */
1695
1696                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1697                         current_ace->owner_type = WORLD_ACE;
1698                         current_ace->unix_ug.world = -1;
1699                         current_ace->type = SMB_ACL_OTHER;
1700                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1701                         current_ace->owner_type = UID_ACE;
1702                         current_ace->unix_ug.uid = pst->st_ex_uid;
1703                         current_ace->type = SMB_ACL_USER_OBJ;
1704
1705                         /*
1706                          * The Creator Owner entry only specifies inheritable permissions,
1707                          * never access permissions. WinNT doesn't always set the ACE to
1708                          * INHERIT_ONLY, though.
1709                          */
1710
1711                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1712
1713                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1714                         current_ace->owner_type = GID_ACE;
1715                         current_ace->unix_ug.gid = pst->st_ex_gid;
1716                         current_ace->type = SMB_ACL_GROUP_OBJ;
1717
1718                         /*
1719                          * The Creator Group entry only specifies inheritable permissions,
1720                          * never access permissions. WinNT doesn't always set the ACE to
1721                          * INHERIT_ONLY, though.
1722                          */
1723                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1724
1725                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1726                         current_ace->owner_type = UID_ACE;
1727                         /* If it's the owning user, this is a user_obj, not
1728                          * a user. */
1729                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1730                                 current_ace->type = SMB_ACL_USER_OBJ;
1731                         } else {
1732                                 current_ace->type = SMB_ACL_USER;
1733                         }
1734                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1735                         current_ace->owner_type = GID_ACE;
1736                         /* If it's the primary group, this is a group_obj, not
1737                          * a group. */
1738                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1739                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1740                         } else {
1741                                 current_ace->type = SMB_ACL_GROUP;
1742                         }
1743                 } else {
1744                         /*
1745                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1746                          */
1747
1748                         if (non_mappable_sid(&psa->trustee)) {
1749                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1750                                            "non-mappable SID %s\n",
1751                                            sid_string_dbg(&psa->trustee)));
1752                                 SAFE_FREE(current_ace);
1753                                 continue;
1754                         }
1755
1756                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1757                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1758                                         "unknown or foreign SID %s\n",
1759                                         sid_string_dbg(&psa->trustee)));
1760                                 SAFE_FREE(current_ace);
1761                                 continue;
1762                         }
1763
1764                         free_canon_ace_list(file_ace);
1765                         free_canon_ace_list(dir_ace);
1766                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1767                                   "%s to uid or gid.\n",
1768                                   sid_string_dbg(&current_ace->trustee)));
1769                         SAFE_FREE(current_ace);
1770                         return False;
1771                 }
1772
1773                 /*
1774                  * Map the given NT permissions into a UNIX mode_t containing only
1775                  * S_I(R|W|X)USR bits.
1776                  */
1777
1778                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1779                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1780
1781                 /* Store the ace_flag. */
1782                 current_ace->ace_flags = psa->flags;
1783
1784                 /*
1785                  * Now add the created ace to either the file list, the directory
1786                  * list, or both. We *MUST* preserve the order here (hence we use
1787                  * DLIST_ADD_END) as NT ACLs are order dependent.
1788                  */
1789
1790                 if (fsp->is_directory) {
1791
1792                         /*
1793                          * We can only add to the default POSIX ACE list if the ACE is
1794                          * designed to be inherited by both files and directories.
1795                          */
1796
1797                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1798                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1799
1800                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1801
1802                                 /*
1803                                  * Note if this was an allow ace. We can't process
1804                                  * any further deny ace's after this.
1805                                  */
1806
1807                                 if (current_ace->attr == ALLOW_ACE)
1808                                         got_dir_allow = True;
1809
1810                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1811                                         DEBUG(0,("create_canon_ace_lists: "
1812                                                  "malformed ACL in "
1813                                                  "inheritable ACL! Deny entry "
1814                                                  "after Allow entry. Failing "
1815                                                  "to set on file %s.\n",
1816                                                  fsp_str_dbg(fsp)));
1817                                         free_canon_ace_list(file_ace);
1818                                         free_canon_ace_list(dir_ace);
1819                                         return False;
1820                                 }
1821
1822                                 if( DEBUGLVL( 10 )) {
1823                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1824                                         print_canon_ace( current_ace, 0);
1825                                 }
1826
1827                                 /*
1828                                  * We have a lossy mapping: directory ACE entries
1829                                  * CREATOR_OWNER ------\
1830                                  *     (map to)         +---> SMB_ACL_USER_OBJ
1831                                  * owning sid    ------/
1832                                  *
1833                                  * CREATOR_GROUP ------\
1834                                  *     (map to)         +---> SMB_ACL_GROUP_OBJ
1835                                  * primary group sid --/
1836                                  *
1837                                  * on set. And on read of a directory ACL
1838                                  *
1839                                  * SMB_ACL_USER_OBJ ----> CREATOR_OWNER
1840                                  * SMB_ACL_GROUP_OBJ ---> CREATOR_GROUP.
1841                                  *
1842                                  * Deal with this on set by duplicating
1843                                  * owning sid and primary group sid ACE
1844                                  * entries into the directory ACL.
1845                                  * Fix from Tsukasa Hamano <hamano@osstech.co.jp>.
1846                                  */
1847
1848                                 if (!dup_owning_ace(dir_ace, current_ace)) {
1849                                         DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1850                                         free_canon_ace_list(file_ace);
1851                                         free_canon_ace_list(dir_ace);
1852                                         return false;
1853                                 }
1854
1855                                 /*
1856                                  * If this is not an inherit only ACE we need to add a duplicate
1857                                  * to the file acl.
1858                                  */
1859
1860                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1861                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1862
1863                                         if (!dup_ace) {
1864                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1865                                                 free_canon_ace_list(file_ace);
1866                                                 free_canon_ace_list(dir_ace);
1867                                                 return False;
1868                                         }
1869
1870                                         /*
1871                                          * We must not free current_ace here as its
1872                                          * pointer is now owned by the dir_ace list.
1873                                          */
1874                                         current_ace = dup_ace;
1875                                         /* We've essentially split this ace into two,
1876                                          * and added the ace with inheritance request
1877                                          * bits to the directory ACL. Drop those bits for
1878                                          * the ACE we're adding to the file list. */
1879                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1880                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1881                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1882                                 } else {
1883                                         /*
1884                                          * We must not free current_ace here as its
1885                                          * pointer is now owned by the dir_ace list.
1886                                          */
1887                                         current_ace = NULL;
1888                                 }
1889                         }
1890                 }
1891
1892                 /*
1893                  * Only add to the file ACL if not inherit only.
1894                  */
1895
1896                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1897                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1898
1899                         /*
1900                          * Note if this was an allow ace. We can't process
1901                          * any further deny ace's after this.
1902                          */
1903
1904                         if (current_ace->attr == ALLOW_ACE)
1905                                 got_file_allow = True;
1906
1907                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1908                                 DEBUG(0,("create_canon_ace_lists: malformed "
1909                                          "ACL in file ACL ! Deny entry after "
1910                                          "Allow entry. Failing to set on file "
1911                                          "%s.\n", fsp_str_dbg(fsp)));
1912                                 free_canon_ace_list(file_ace);
1913                                 free_canon_ace_list(dir_ace);
1914                                 return False;
1915                         }
1916
1917                         if( DEBUGLVL( 10 )) {
1918                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1919                                 print_canon_ace( current_ace, 0);
1920                         }
1921                         all_aces_are_inherit_only = False;
1922                         /*
1923                          * We must not free current_ace here as its
1924                          * pointer is now owned by the file_ace list.
1925                          */
1926                         current_ace = NULL;
1927                 }
1928
1929                 /*
1930                  * Free if ACE was not added.
1931                  */
1932
1933                 SAFE_FREE(current_ace);
1934         }
1935
1936         if (fsp->is_directory && all_aces_are_inherit_only) {
1937                 /*
1938                  * Windows 2000 is doing one of these weird 'inherit acl'
1939                  * traverses to conserve NTFS ACL resources. Just pretend
1940                  * there was no DACL sent. JRA.
1941                  */
1942
1943                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1944                 free_canon_ace_list(file_ace);
1945                 free_canon_ace_list(dir_ace);
1946                 file_ace = NULL;
1947                 dir_ace = NULL;
1948         } else {
1949                 /*
1950                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1951                  * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1952                  * entries can be converted to *_OBJ. Usually we will already have these
1953                  * entries in the Default ACL, and the Access ACL will not have them.
1954                  */
1955                 if (file_ace) {
1956                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1957                 }
1958                 if (dir_ace) {
1959                         check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1960                 }
1961         }
1962
1963         *ppfile_ace = file_ace;
1964         *ppdir_ace = dir_ace;
1965
1966         return True;
1967 }
1968
1969 /****************************************************************************
1970  ASCII art time again... JRA :-).
1971
1972  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1973  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1974  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1975  allow or deny have been merged, so the same SID can only appear once in the deny
1976  list or once in the allow list.
1977
1978  We then process as follows :
1979
1980  ---------------------------------------------------------------------------
1981  First pass - look for a Everyone DENY entry.
1982
1983  If it is deny all (rwx) trunate the list at this point.
1984  Else, walk the list from this point and use the deny permissions of this
1985  entry as a mask on all following allow entries. Finally, delete
1986  the Everyone DENY entry (we have applied it to everything possible).
1987
1988  In addition, in this pass we remove any DENY entries that have
1989  no permissions (ie. they are a DENY nothing).
1990  ---------------------------------------------------------------------------
1991  Second pass - only deal with deny user entries.
1992
1993  DENY user1 (perms XXX)
1994
1995  new_perms = 0
1996  for all following allow group entries where user1 is in group
1997         new_perms |= group_perms;
1998
1999  user1 entry perms = new_perms & ~ XXX;
2000
2001  Convert the deny entry to an allow entry with the new perms and
2002  push to the end of the list. Note if the user was in no groups
2003  this maps to a specific allow nothing entry for this user.
2004
2005  The common case from the NT ACL choser (userX deny all) is
2006  optimised so we don't do the group lookup - we just map to
2007  an allow nothing entry.
2008
2009  What we're doing here is inferring the allow permissions the
2010  person setting the ACE on user1 wanted by looking at the allow
2011  permissions on the groups the user is currently in. This will
2012  be a snapshot, depending on group membership but is the best
2013  we can do and has the advantage of failing closed rather than
2014  open.
2015  ---------------------------------------------------------------------------
2016  Third pass - only deal with deny group entries.
2017
2018  DENY group1 (perms XXX)
2019
2020  for all following allow user entries where user is in group1
2021    user entry perms = user entry perms & ~ XXX;
2022
2023  If there is a group Everyone allow entry with permissions YYY,
2024  convert the group1 entry to an allow entry and modify its
2025  permissions to be :
2026
2027  new_perms = YYY & ~ XXX
2028
2029  and push to the end of the list.
2030
2031  If there is no group Everyone allow entry then convert the
2032  group1 entry to a allow nothing entry and push to the end of the list.
2033
2034  Note that the common case from the NT ACL choser (groupX deny all)
2035  cannot be optimised here as we need to modify user entries who are
2036  in the group to change them to a deny all also.
2037
2038  What we're doing here is modifying the allow permissions of
2039  user entries (which are more specific in POSIX ACLs) to mask
2040  out the explicit deny set on the group they are in. This will
2041  be a snapshot depending on current group membership but is the
2042  best we can do and has the advantage of failing closed rather
2043  than open.
2044  ---------------------------------------------------------------------------
2045  Fourth pass - cope with cumulative permissions.
2046
2047  for all allow user entries, if there exists an allow group entry with
2048  more permissive permissions, and the user is in that group, rewrite the
2049  allow user permissions to contain both sets of permissions.
2050
2051  Currently the code for this is #ifdef'ed out as these semantics make
2052  no sense to me. JRA.
2053  ---------------------------------------------------------------------------
2054
2055  Note we *MUST* do the deny user pass first as this will convert deny user
2056  entries into allow user entries which can then be processed by the deny
2057  group pass.
2058
2059  The above algorithm took a *lot* of thinking about - hence this
2060  explaination :-). JRA.
2061 ****************************************************************************/
2062
2063 /****************************************************************************
2064  Process a canon_ace list entries. This is very complex code. We need
2065  to go through and remove the "deny" permissions from any allow entry that matches
2066  the id of this entry. We have already refused any NT ACL that wasn't in correct
2067  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2068  we just remove it (to fail safe). We have already removed any duplicate ace
2069  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2070  allow entries.
2071 ****************************************************************************/
2072
2073 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2074 {
2075         canon_ace *ace_list = *pp_ace_list;
2076         canon_ace *curr_ace = NULL;
2077         canon_ace *curr_ace_next = NULL;
2078
2079         /* Pass 1 above - look for an Everyone, deny entry. */
2080
2081         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2082                 canon_ace *allow_ace_p;
2083
2084                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2085
2086                 if (curr_ace->attr != DENY_ACE)
2087                         continue;
2088
2089                 if (curr_ace->perms == (mode_t)0) {
2090
2091                         /* Deny nothing entry - delete. */
2092
2093                         DLIST_REMOVE(ace_list, curr_ace);
2094                         continue;
2095                 }
2096
2097                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2098                         continue;
2099
2100                 /* JRATEST - assert. */
2101                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2102
2103                 if (curr_ace->perms == ALL_ACE_PERMS) {
2104
2105                         /*
2106                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2107                          * list at this point including this entry.
2108                          */
2109
2110                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2111
2112                         free_canon_ace_list( curr_ace );
2113                         if (prev_entry)
2114                                 DLIST_REMOVE(ace_list, prev_entry);
2115                         else {
2116                                 /* We deleted the entire list. */
2117                                 ace_list = NULL;
2118                         }
2119                         break;
2120                 }
2121
2122                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2123
2124                         /*
2125                          * Only mask off allow entries.
2126                          */
2127
2128                         if (allow_ace_p->attr != ALLOW_ACE)
2129                                 continue;
2130
2131                         allow_ace_p->perms &= ~curr_ace->perms;
2132                 }
2133
2134                 /*
2135                  * Now it's been applied, remove it.
2136                  */
2137
2138                 DLIST_REMOVE(ace_list, curr_ace);
2139         }
2140
2141         /* Pass 2 above - deal with deny user entries. */
2142
2143         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2144                 mode_t new_perms = (mode_t)0;
2145                 canon_ace *allow_ace_p;
2146
2147                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2148
2149                 if (curr_ace->attr != DENY_ACE)
2150                         continue;
2151
2152                 if (curr_ace->owner_type != UID_ACE)
2153                         continue;
2154
2155                 if (curr_ace->perms == ALL_ACE_PERMS) {
2156
2157                         /*
2158                          * Optimisation - this is a deny everything to this user.
2159                          * Convert to an allow nothing and push to the end of the list.
2160                          */
2161
2162                         curr_ace->attr = ALLOW_ACE;
2163                         curr_ace->perms = (mode_t)0;
2164                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2165                         continue;
2166                 }
2167
2168                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2169
2170                         if (allow_ace_p->attr != ALLOW_ACE)
2171                                 continue;
2172
2173                         /* We process GID_ACE and WORLD_ACE entries only. */
2174
2175                         if (allow_ace_p->owner_type == UID_ACE)
2176                                 continue;
2177
2178                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2179                                 new_perms |= allow_ace_p->perms;
2180                 }
2181
2182                 /*
2183                  * Convert to a allow entry, modify the perms and push to the end
2184                  * of the list.
2185                  */
2186
2187                 curr_ace->attr = ALLOW_ACE;
2188                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2189                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2190         }
2191
2192         /* Pass 3 above - deal with deny group entries. */
2193
2194         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2195                 canon_ace *allow_ace_p;
2196                 canon_ace *allow_everyone_p = NULL;
2197
2198                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2199
2200                 if (curr_ace->attr != DENY_ACE)
2201                         continue;
2202
2203                 if (curr_ace->owner_type != GID_ACE)
2204                         continue;
2205
2206                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2207
2208                         if (allow_ace_p->attr != ALLOW_ACE)
2209                                 continue;
2210
2211                         /* Store a pointer to the Everyone allow, if it exists. */
2212                         if (allow_ace_p->owner_type == WORLD_ACE)
2213                                 allow_everyone_p = allow_ace_p;
2214
2215                         /* We process UID_ACE entries only. */
2216
2217                         if (allow_ace_p->owner_type != UID_ACE)
2218                                 continue;
2219
2220                         /* Mask off the deny group perms. */
2221
2222                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2223                                 allow_ace_p->perms &= ~curr_ace->perms;
2224                 }
2225
2226                 /*
2227                  * Convert the deny to an allow with the correct perms and
2228                  * push to the end of the list.
2229                  */
2230
2231                 curr_ace->attr = ALLOW_ACE;
2232                 if (allow_everyone_p)
2233                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2234                 else
2235                         curr_ace->perms = (mode_t)0;
2236                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2237         }
2238
2239         /* Doing this fourth pass allows Windows semantics to be layered
2240          * on top of POSIX semantics. I'm not sure if this is desirable.
2241          * For example, in W2K ACLs there is no way to say, "Group X no
2242          * access, user Y full access" if user Y is a member of group X.
2243          * This seems completely broken semantics to me.... JRA.
2244          */
2245
2246 #if 0
2247         /* Pass 4 above - deal with allow entries. */
2248
2249         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2250                 canon_ace *allow_ace_p;
2251
2252                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2253
2254                 if (curr_ace->attr != ALLOW_ACE)
2255                         continue;
2256
2257                 if (curr_ace->owner_type != UID_ACE)
2258                         continue;
2259
2260                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2261
2262                         if (allow_ace_p->attr != ALLOW_ACE)
2263                                 continue;
2264
2265                         /* We process GID_ACE entries only. */
2266
2267                         if (allow_ace_p->owner_type != GID_ACE)
2268                                 continue;
2269
2270                         /* OR in the group perms. */
2271
2272                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2273                                 curr_ace->perms |= allow_ace_p->perms;
2274                 }
2275         }
2276 #endif
2277
2278         *pp_ace_list = ace_list;
2279 }
2280
2281 /****************************************************************************
2282  Create a default mode that will be used if a security descriptor entry has
2283  no user/group/world entries.
2284 ****************************************************************************/
2285
2286 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2287 {
2288         int snum = SNUM(fsp->conn);
2289         mode_t and_bits = (mode_t)0;
2290         mode_t or_bits = (mode_t)0;
2291         mode_t mode;
2292
2293         if (interitable_mode) {
2294                 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2295                                  fsp->fsp_name, NULL);
2296         } else {
2297                 mode = S_IRUSR;
2298         }
2299
2300         if (fsp->is_directory)
2301                 mode |= (S_IWUSR|S_IXUSR);
2302
2303         /*
2304          * Now AND with the create mode/directory mode bits then OR with the
2305          * force create mode/force directory mode bits.
2306          */
2307
2308         if (fsp->is_directory) {
2309                 and_bits = lp_dir_security_mask(snum);
2310                 or_bits = lp_force_dir_security_mode(snum);
2311         } else {
2312                 and_bits = lp_security_mask(snum);
2313                 or_bits = lp_force_security_mode(snum);
2314         }
2315
2316         return ((mode & and_bits)|or_bits);
2317 }
2318
2319 /****************************************************************************
2320  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2321  succeeding.
2322 ****************************************************************************/
2323
2324 static bool unpack_canon_ace(files_struct *fsp,
2325                                 const SMB_STRUCT_STAT *pst,
2326                                 struct dom_sid *pfile_owner_sid,
2327                                 struct dom_sid *pfile_grp_sid,
2328                                 canon_ace **ppfile_ace,
2329                                 canon_ace **ppdir_ace,
2330                                 uint32 security_info_sent,
2331                                 const struct security_descriptor *psd)
2332 {
2333         SMB_STRUCT_STAT st;
2334         canon_ace *file_ace = NULL;
2335         canon_ace *dir_ace = NULL;
2336
2337         *ppfile_ace = NULL;
2338         *ppdir_ace = NULL;
2339
2340         if(security_info_sent == 0) {
2341                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2342                 return False;
2343         }
2344
2345         /*
2346          * If no DACL then this is a chown only security descriptor.
2347          */
2348
2349         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2350                 return True;
2351
2352         /*
2353          * Now go through the DACL and create the canon_ace lists.
2354          */
2355
2356         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2357                                                                 &file_ace, &dir_ace, psd->dacl))
2358                 return False;
2359
2360         if ((file_ace == NULL) && (dir_ace == NULL)) {
2361                 /* W2K traverse DACL set - ignore. */
2362                 return True;
2363         }
2364
2365         /*
2366          * Go through the canon_ace list and merge entries
2367          * belonging to identical users of identical allow or deny type.
2368          * We can do this as all deny entries come first, followed by
2369          * all allow entries (we have mandated this before accepting this acl).
2370          */
2371
2372         print_canon_ace_list( "file ace - before merge", file_ace);
2373         merge_aces( &file_ace, false);
2374
2375         print_canon_ace_list( "dir ace - before merge", dir_ace);
2376         merge_aces( &dir_ace, true);
2377
2378         /*
2379          * NT ACLs are order dependent. Go through the acl lists and
2380          * process DENY entries by masking the allow entries.
2381          */
2382
2383         print_canon_ace_list( "file ace - before deny", file_ace);
2384         process_deny_list(fsp->conn, &file_ace);
2385
2386         print_canon_ace_list( "dir ace - before deny", dir_ace);
2387         process_deny_list(fsp->conn, &dir_ace);
2388
2389         /*
2390          * A well formed POSIX file or default ACL has at least 3 entries, a
2391          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2392          * and optionally a mask entry. Ensure this is the case.
2393          */
2394
2395         print_canon_ace_list( "file ace - before valid", file_ace);
2396
2397         st = *pst;
2398
2399         /*
2400          * A default 3 element mode entry for a file should be r-- --- ---.
2401          * A default 3 element mode entry for a directory should be rwx --- ---.
2402          */
2403
2404         st.st_ex_mode = create_default_mode(fsp, False);
2405
2406         if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2407                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2408                 free_canon_ace_list(file_ace);
2409                 free_canon_ace_list(dir_ace);
2410                 return False;
2411         }
2412
2413         print_canon_ace_list( "dir ace - before valid", dir_ace);
2414
2415         /*
2416          * A default inheritable 3 element mode entry for a directory should be the
2417          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2418          * it's a directory.
2419          */
2420
2421         st.st_ex_mode = create_default_mode(fsp, True);
2422
2423         if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2424                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2425                 free_canon_ace_list(file_ace);
2426                 free_canon_ace_list(dir_ace);
2427                 return False;
2428         }
2429
2430         print_canon_ace_list( "file ace - return", file_ace);
2431         print_canon_ace_list( "dir ace - return", dir_ace);
2432
2433         *ppfile_ace = file_ace;
2434         *ppdir_ace = dir_ace;
2435         return True;
2436
2437 }
2438
2439 /******************************************************************************
2440  When returning permissions, try and fit NT display
2441  semantics if possible. Note the the canon_entries here must have been malloced.
2442  The list format should be - first entry = owner, followed by group and other user
2443  entries, last entry = other.
2444
2445  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2446  are not ordered, and match on the most specific entry rather than walking a list,
2447  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2448
2449  Entry 0: owner : deny all except read and write.
2450  Entry 1: owner : allow read and write.
2451  Entry 2: group : deny all except read.
2452  Entry 3: group : allow read.
2453  Entry 4: Everyone : allow read.
2454
2455  But NT cannot display this in their ACL editor !
2456 ********************************************************************************/
2457
2458 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2459 {
2460         canon_ace *l_head = *pp_list_head;
2461         canon_ace *owner_ace = NULL;
2462         canon_ace *other_ace = NULL;
2463         canon_ace *ace = NULL;
2464
2465         for (ace = l_head; ace; ace = ace->next) {
2466                 if (ace->type == SMB_ACL_USER_OBJ)
2467                         owner_ace = ace;
2468                 else if (ace->type == SMB_ACL_OTHER) {
2469                         /* Last ace - this is "other" */
2470                         other_ace = ace;
2471                 }
2472         }
2473
2474         if (!owner_ace || !other_ace) {
2475                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2476                         filename ));
2477                 return;
2478         }
2479
2480         /*
2481          * The POSIX algorithm applies to owner first, and other last,
2482          * so ensure they are arranged in this order.
2483          */
2484
2485         if (owner_ace) {
2486                 DLIST_PROMOTE(l_head, owner_ace);
2487         }
2488
2489         if (other_ace) {
2490                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2491         }
2492
2493         /* We have probably changed the head of the list. */
2494
2495         *pp_list_head = l_head;
2496 }
2497
2498 /****************************************************************************
2499  Create a linked list of canonical ACE entries.
2500 ****************************************************************************/
2501
2502 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2503                                    const char *fname, SMB_ACL_T posix_acl,
2504                                    const SMB_STRUCT_STAT *psbuf,
2505                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2506 {
2507         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2508         canon_ace *l_head = NULL;
2509         canon_ace *ace = NULL;
2510         canon_ace *next_ace = NULL;
2511         int entry_id = SMB_ACL_FIRST_ENTRY;
2512         SMB_ACL_ENTRY_T entry;
2513         size_t ace_count;
2514
2515         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2516                 SMB_ACL_TAG_T tagtype;
2517                 SMB_ACL_PERMSET_T permset;
2518                 struct dom_sid sid;
2519                 posix_id unix_ug;
2520                 enum ace_owner owner_type;
2521
2522                 entry_id = SMB_ACL_NEXT_ENTRY;
2523
2524                 /* Is this a MASK entry ? */
2525                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2526                         continue;
2527
2528                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2529                         continue;
2530
2531                 /* Decide which SID to use based on the ACL type. */
2532                 switch(tagtype) {
2533                         case SMB_ACL_USER_OBJ:
2534                                 /* Get the SID from the owner. */
2535                                 sid_copy(&sid, powner);
2536                                 unix_ug.uid = psbuf->st_ex_uid;
2537                                 owner_type = UID_ACE;
2538                                 break;
2539                         case SMB_ACL_USER:
2540                                 {
2541                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2542                                         if (puid == NULL) {
2543                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2544                                                 continue;
2545                                         }
2546                                         uid_to_sid( &sid, *puid);
2547                                         unix_ug.uid = *puid;
2548                                         owner_type = UID_ACE;
2549                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2550                                         break;
2551                                 }
2552                         case SMB_ACL_GROUP_OBJ:
2553                                 /* Get the SID from the owning group. */
2554                                 sid_copy(&sid, pgroup);
2555                                 unix_ug.gid = psbuf->st_ex_gid;
2556                                 owner_type = GID_ACE;
2557                                 break;
2558                         case SMB_ACL_GROUP:
2559                                 {
2560                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2561                                         if (pgid == NULL) {
2562                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2563                                                 continue;
2564                                         }
2565                                         gid_to_sid( &sid, *pgid);
2566                                         unix_ug.gid = *pgid;
2567                                         owner_type = GID_ACE;
2568                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2569                                         break;
2570                                 }
2571                         case SMB_ACL_MASK:
2572                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2573                                 continue; /* Don't count the mask as an entry. */
2574                         case SMB_ACL_OTHER:
2575                                 /* Use the Everyone SID */
2576                                 sid = global_sid_World;
2577                                 unix_ug.world = -1;
2578                                 owner_type = WORLD_ACE;
2579                                 break;
2580                         default:
2581                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2582                                 continue;
2583                 }
2584
2585                 /*
2586                  * Add this entry to the list.
2587                  */
2588
2589                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2590                         goto fail;
2591
2592                 ZERO_STRUCTP(ace);
2593                 ace->type = tagtype;
2594                 ace->perms = convert_permset_to_mode_t(conn, permset);
2595                 ace->attr = ALLOW_ACE;
2596                 ace->trustee = sid;
2597                 ace->unix_ug = unix_ug;
2598                 ace->owner_type = owner_type;
2599                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2600
2601                 DLIST_ADD(l_head, ace);
2602         }
2603
2604         /*
2605          * This next call will ensure we have at least a user/group/world set.
2606          */
2607
2608         if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2609                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2610                                       psbuf, False))
2611                 goto fail;
2612
2613         /*
2614          * Now go through the list, masking the permissions with the
2615          * acl_mask. Ensure all DENY Entries are at the start of the list.
2616          */
2617
2618         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2619
2620         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2621                 next_ace = ace->next;
2622
2623                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2624                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2625                         ace->perms &= acl_mask;
2626
2627                 if (ace->perms == 0) {
2628                         DLIST_PROMOTE(l_head, ace);
2629                 }
2630
2631                 if( DEBUGLVL( 10 ) ) {
2632                         print_canon_ace(ace, ace_count);
2633                 }
2634         }
2635
2636         arrange_posix_perms(fname,&l_head );
2637
2638         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2639
2640         return l_head;
2641
2642   fail:
2643
2644         free_canon_ace_list(l_head);
2645         return NULL;
2646 }
2647
2648 /****************************************************************************
2649  Check if the current user group list contains a given group.
2650 ****************************************************************************/
2651
2652 static bool current_user_in_group(connection_struct *conn, gid_t gid)
2653 {
2654         int i;
2655         const UNIX_USER_TOKEN *utok = get_current_utok(conn);
2656
2657         for (i = 0; i < utok->ngroups; i++) {
2658                 if (utok->groups[i] == gid) {
2659                         return True;
2660                 }
2661         }
2662
2663         return False;
2664 }
2665
2666 /****************************************************************************
2667  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2668 ****************************************************************************/
2669
2670 static bool acl_group_override(connection_struct *conn,
2671                                const struct smb_filename *smb_fname)
2672 {
2673         if ((errno != EPERM) && (errno != EACCES)) {
2674                 return false;
2675         }
2676
2677         /* file primary group == user primary or supplementary group */
2678         if (lp_acl_group_control(SNUM(conn)) &&
2679             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2680                 return true;
2681         }
2682
2683         /* user has writeable permission */
2684         if (lp_dos_filemode(SNUM(conn)) &&
2685             can_write_to_file(conn, smb_fname)) {
2686                 return true;
2687         }
2688
2689         return false;
2690 }
2691
2692 /****************************************************************************
2693  Attempt to apply an ACL to a file or directory.
2694 ****************************************************************************/
2695
2696 static bool set_canon_ace_list(files_struct *fsp,
2697                                 canon_ace *the_ace,
2698                                 bool default_ace,
2699                                 const SMB_STRUCT_STAT *psbuf,
2700                                 bool *pacl_set_support)
2701 {
2702         connection_struct *conn = fsp->conn;
2703         bool ret = False;
2704         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2705         canon_ace *p_ace;
2706         int i;
2707         SMB_ACL_ENTRY_T mask_entry;
2708         bool got_mask_entry = False;
2709         SMB_ACL_PERMSET_T mask_permset;
2710         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2711         bool needs_mask = False;
2712         mode_t mask_perms = 0;
2713
2714         /* Use the psbuf that was passed in. */
2715         if (psbuf != &fsp->fsp_name->st) {
2716                 fsp->fsp_name->st = *psbuf;
2717         }
2718
2719 #if defined(POSIX_ACL_NEEDS_MASK)
2720         /* HP-UX always wants to have a mask (called "class" there). */
2721         needs_mask = True;
2722 #endif
2723
2724         if (the_acl == NULL) {
2725
2726                 if (!no_acl_syscall_error(errno)) {
2727                         /*
2728                          * Only print this error message if we have some kind of ACL
2729                          * support that's not working. Otherwise we would always get this.
2730                          */
2731                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2732                                 default_ace ? "default" : "file", strerror(errno) ));
2733                 }
2734                 *pacl_set_support = False;
2735                 goto fail;
2736         }
2737
2738         if( DEBUGLVL( 10 )) {
2739                 dbgtext("set_canon_ace_list: setting ACL:\n");
2740                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2741                         print_canon_ace( p_ace, i);
2742                 }
2743         }
2744
2745         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2746                 SMB_ACL_ENTRY_T the_entry;
2747                 SMB_ACL_PERMSET_T the_permset;
2748
2749                 /*
2750                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2751                  * named group entries. But if there is an ACL_MASK entry, it applies
2752                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2753                  * so that it doesn't deny (i.e., mask off) any permissions.
2754                  */
2755
2756                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2757                         needs_mask = True;
2758                         mask_perms |= p_ace->perms;
2759                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2760                         mask_perms |= p_ace->perms;
2761                 }
2762
2763                 /*
2764                  * Get the entry for this ACE.
2765                  */
2766
2767                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2768                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2769                                 i, strerror(errno) ));
2770                         goto fail;
2771                 }
2772
2773                 if (p_ace->type == SMB_ACL_MASK) {
2774                         mask_entry = the_entry;
2775                         got_mask_entry = True;
2776                 }
2777
2778                 /*
2779                  * Ok - we now know the ACL calls should be working, don't
2780                  * allow fallback to chmod.
2781                  */
2782
2783                 *pacl_set_support = True;
2784
2785                 /*
2786                  * Initialise the entry from the canon_ace.
2787                  */
2788
2789                 /*
2790                  * First tell the entry what type of ACE this is.
2791                  */
2792
2793                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2794                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2795                                 i, strerror(errno) ));
2796                         goto fail;
2797                 }
2798
2799                 /*
2800                  * Only set the qualifier (user or group id) if the entry is a user
2801                  * or group id ACE.
2802                  */
2803
2804                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2805                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2806                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2807                                         i, strerror(errno) ));
2808                                 goto fail;
2809                         }
2810                 }
2811
2812                 /*
2813                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2814                  */
2815
2816                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2817                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2818                                 i, strerror(errno) ));
2819                         goto fail;
2820                 }
2821
2822                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2823                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2824                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2825                         goto fail;
2826                 }
2827
2828                 /*
2829                  * ..and apply them to the entry.
2830                  */
2831
2832                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2833                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2834                                 i, strerror(errno) ));
2835                         goto fail;
2836                 }
2837
2838                 if( DEBUGLVL( 10 ))
2839                         print_canon_ace( p_ace, i);
2840
2841         }
2842
2843         if (needs_mask && !got_mask_entry) {
2844                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2845                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2846                         goto fail;
2847                 }
2848
2849                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2850                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2851                         goto fail;
2852                 }
2853
2854                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2855                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2856                         goto fail;
2857                 }
2858
2859                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2860                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2861                         goto fail;
2862                 }
2863
2864                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2865                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2866                         goto fail;
2867                 }
2868         }
2869
2870         /*
2871          * Finally apply it to the file or directory.
2872          */
2873
2874         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2875                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2876                                              the_acl_type, the_acl) == -1) {
2877                         /*
2878                          * Some systems allow all the above calls and only fail with no ACL support
2879                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2880                          */
2881                         if (no_acl_syscall_error(errno)) {
2882                                 *pacl_set_support = False;
2883                         }
2884
2885                         if (acl_group_override(conn, fsp->fsp_name)) {
2886                                 int sret;
2887
2888                                 DEBUG(5,("set_canon_ace_list: acl group "
2889                                          "control on and current user in file "
2890                                          "%s primary group.\n",
2891                                          fsp_str_dbg(fsp)));
2892
2893                                 become_root();
2894                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2895                                     fsp->fsp_name->base_name, the_acl_type,
2896                                     the_acl);
2897                                 unbecome_root();
2898                                 if (sret == 0) {
2899                                         ret = True;
2900                                 }
2901                         }
2902
2903                         if (ret == False) {
2904                                 DEBUG(2,("set_canon_ace_list: "
2905                                          "sys_acl_set_file type %s failed for "
2906                                          "file %s (%s).\n",
2907                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2908                                          "directory default" : "file",
2909                                          fsp_str_dbg(fsp), strerror(errno)));
2910                                 goto fail;
2911                         }
2912                 }
2913         } else {
2914                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2915                         /*
2916                          * Some systems allow all the above calls and only fail with no ACL support
2917                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2918                          */
2919                         if (no_acl_syscall_error(errno)) {
2920                                 *pacl_set_support = False;
2921                         }
2922
2923                         if (acl_group_override(conn, fsp->fsp_name)) {
2924                                 int sret;
2925
2926                                 DEBUG(5,("set_canon_ace_list: acl group "
2927                                          "control on and current user in file "
2928                                          "%s primary group.\n",
2929                                          fsp_str_dbg(fsp)));
2930
2931                                 become_root();
2932                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2933                                 unbecome_root();
2934                                 if (sret == 0) {
2935                                         ret = True;
2936                                 }
2937                         }
2938
2939                         if (ret == False) {
2940                                 DEBUG(2,("set_canon_ace_list: "
2941                                          "sys_acl_set_file failed for file %s "
2942                                          "(%s).\n",
2943                                          fsp_str_dbg(fsp), strerror(errno)));
2944                                 goto fail;
2945                         }
2946                 }
2947         }
2948
2949         ret = True;
2950
2951   fail:
2952
2953         if (the_acl != NULL) {
2954                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2955         }
2956
2957         return ret;
2958 }
2959
2960 /****************************************************************************
2961  Find a particular canon_ace entry.
2962 ****************************************************************************/
2963
2964 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2965 {
2966         while (list) {
2967                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2968                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2969                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2970                         break;
2971                 list = list->next;
2972         }
2973         return list;
2974 }
2975
2976 /****************************************************************************
2977
2978 ****************************************************************************/
2979
2980 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2981 {
2982         SMB_ACL_ENTRY_T entry;
2983
2984         if (!the_acl)
2985                 return NULL;
2986         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2987                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2988                 return NULL;
2989         }
2990         return the_acl;
2991 }
2992
2993 /****************************************************************************
2994  Convert a canon_ace to a generic 3 element permission - if possible.
2995 ****************************************************************************/
2996
2997 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2998
2999 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3000 {
3001         int snum = SNUM(fsp->conn);
3002         size_t ace_count = count_canon_ace_list(file_ace_list);
3003         canon_ace *ace_p;
3004         canon_ace *owner_ace = NULL;
3005         canon_ace *group_ace = NULL;
3006         canon_ace *other_ace = NULL;
3007         mode_t and_bits;
3008         mode_t or_bits;
3009
3010         if (ace_count != 3) {
3011                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3012                          "entries for file %s to convert to posix perms.\n",
3013                          fsp_str_dbg(fsp)));
3014                 return False;
3015         }
3016
3017         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3018                 if (ace_p->owner_type == UID_ACE)
3019                         owner_ace = ace_p;
3020                 else if (ace_p->owner_type == GID_ACE)
3021                         group_ace = ace_p;
3022                 else if (ace_p->owner_type == WORLD_ACE)
3023                         other_ace = ace_p;
3024         }
3025
3026         if (!owner_ace || !group_ace || !other_ace) {
3027                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3028                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3029                 return False;
3030         }
3031
3032         *posix_perms = (mode_t)0;
3033
3034         *posix_perms |= owner_ace->perms;
3035         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3036         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3037         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3038         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3039         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3040         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3041
3042         /* The owner must have at least read access. */
3043
3044         *posix_perms |= S_IRUSR;
3045         if (fsp->is_directory)
3046                 *posix_perms |= (S_IWUSR|S_IXUSR);
3047
3048         /* If requested apply the masks. */
3049
3050         /* Get the initial bits to apply. */
3051
3052         if (fsp->is_directory) {
3053                 and_bits = lp_dir_security_mask(snum);
3054                 or_bits = lp_force_dir_security_mode(snum);
3055         } else {
3056                 and_bits = lp_security_mask(snum);
3057                 or_bits = lp_force_security_mode(snum);
3058         }
3059
3060         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3061
3062         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3063                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3064                   (int)group_ace->perms, (int)other_ace->perms,
3065                   (int)*posix_perms, fsp_str_dbg(fsp)));
3066
3067         return True;
3068 }
3069
3070 /****************************************************************************
3071   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3072   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3073   with CI|OI set so it is inherited and also applies to the directory.
3074   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3075 ****************************************************************************/
3076
3077 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3078 {
3079         size_t i, j;
3080
3081         for (i = 0; i < num_aces; i++) {
3082                 for (j = i+1; j < num_aces; j++) {
3083                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3084                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3085                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3086                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3087
3088                         /* We know the lower number ACE's are file entries. */
3089                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3090                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3091                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3092                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3093                                 (i_inh == j_inh) &&
3094                                 (i_flags_ni == 0) &&
3095                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3096                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3097                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3098                                 /*
3099                                  * W2K wants to have access allowed zero access ACE's
3100                                  * at the end of the list. If the mask is zero, merge
3101                                  * the non-inherited ACE onto the inherited ACE.
3102                                  */
3103
3104                                 if (nt_ace_list[i].access_mask == 0) {
3105                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3106                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3107                                         if (num_aces - i - 1 > 0)
3108                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3109                                                                 sizeof(struct security_ace));
3110
3111                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3112                                                 (unsigned int)i, (unsigned int)j ));
3113                                 } else {
3114                                         /*
3115                                          * These are identical except for the flags.
3116                                          * Merge the inherited ACE onto the non-inherited ACE.
3117                                          */
3118
3119                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3120                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3121                                         if (num_aces - j - 1 > 0)
3122                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3123                                                                 sizeof(struct security_ace));
3124
3125                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3126                                                 (unsigned int)j, (unsigned int)i ));
3127                                 }
3128                                 num_aces--;
3129                                 break;
3130                         }
3131                 }
3132         }
3133
3134         return num_aces;
3135 }
3136
3137 /*
3138  * Add or Replace ACE entry.
3139  * In some cases we need to add a specific ACE for compatibility reasons.
3140  * When doing that we must make sure we are not actually creating a duplicate
3141  * entry. So we need to search whether an ACE entry already exist and eventually
3142  * replacce the access mask, or add a completely new entry if none was found.
3143  *
3144  * This function assumes the array has enough space to add a new entry without
3145  * any reallocation of memory.
3146  */
3147
3148 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3149                                 const struct dom_sid *sid, enum security_ace_type type,
3150                                 uint32_t mask, uint8_t flags)
3151 {
3152         int i;
3153
3154         /* first search for a duplicate */
3155         for (i = 0; i < *num_aces; i++) {
3156                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3157                     (nt_ace_list[i].flags == flags)) break;
3158         }
3159
3160         if (i < *num_aces) { /* found */
3161                 nt_ace_list[i].type = type;
3162                 nt_ace_list[i].access_mask = mask;
3163                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3164                            i, sid_string_dbg(sid), flags));
3165                 return;
3166         }
3167
3168         /* not found, append it */
3169         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3170 }
3171
3172
3173 /****************************************************************************
3174  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3175  the space for the return elements and returns the size needed to return the
3176  security descriptor. This should be the only external function needed for
3177  the UNIX style get ACL.
3178 ****************************************************************************/
3179
3180 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3181                                       const char *name,
3182                                       const SMB_STRUCT_STAT *sbuf,
3183                                       struct pai_val *pal,
3184                                       SMB_ACL_T posix_acl,
3185                                       SMB_ACL_T def_acl,
3186                                       uint32_t security_info,
3187                                       struct security_descriptor **ppdesc)
3188 {
3189         struct dom_sid owner_sid;
3190         struct dom_sid group_sid;
3191         size_t sd_size = 0;
3192         struct security_acl *psa = NULL;
3193         size_t num_acls = 0;
3194         size_t num_def_acls = 0;
3195         size_t num_aces = 0;
3196         canon_ace *file_ace = NULL;
3197         canon_ace *dir_ace = NULL;
3198         struct security_ace *nt_ace_list = NULL;
3199         size_t num_profile_acls = 0;
3200         struct dom_sid orig_owner_sid;
3201         struct security_descriptor *psd = NULL;
3202         int i;
3203
3204         /*
3205          * Get the owner, group and world SIDs.
3206          */
3207
3208         create_file_sids(sbuf, &owner_sid, &group_sid);
3209
3210         if (lp_profile_acls(SNUM(conn))) {
3211                 /* For WXP SP1 the owner must be administrators. */
3212                 sid_copy(&orig_owner_sid, &owner_sid);
3213                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3214                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3215                 num_profile_acls = 3;
3216         }
3217
3218         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3219
3220                 /*
3221                  * In the optimum case Creator Owner and Creator Group would be used for
3222                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3223                  * would lead to usability problems under Windows: The Creator entries
3224                  * are only available in browse lists of directories and not for files;
3225                  * additionally the identity of the owning group couldn't be determined.
3226                  * We therefore use those identities only for Default ACLs.
3227                  */
3228
3229                 /* Create the canon_ace lists. */
3230                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3231                                             &owner_sid, &group_sid, pal,
3232                                             SMB_ACL_TYPE_ACCESS);
3233
3234                 /* We must have *some* ACLS. */
3235
3236                 if (count_canon_ace_list(file_ace) == 0) {
3237                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3238                         goto done;
3239                 }
3240
3241                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3242                         dir_ace = canonicalise_acl(conn, name, def_acl,
3243                                                    sbuf,
3244                                                    &global_sid_Creator_Owner,
3245                                                    &global_sid_Creator_Group,
3246                                                    pal, SMB_ACL_TYPE_DEFAULT);
3247                 }
3248
3249                 /*
3250                  * Create the NT ACE list from the canonical ace lists.
3251                  */
3252
3253                 {
3254                         canon_ace *ace;
3255                         enum security_ace_type nt_acl_type;
3256
3257                         if (nt4_compatible_acls() && dir_ace) {
3258                                 /*
3259                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3260                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3261                                  * remove entries from the Access ACL if the
3262                                  * corresponding Default ACL entries have also been
3263                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3264                                  * are exceptions. We can do nothing
3265                                  * intelligent if the Default ACL contains entries that
3266                                  * are not also contained in the Access ACL, so this
3267                                  * case will still fail under NT 4.
3268                                  */
3269
3270                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3271                                 if (ace && !ace->perms) {
3272                                         DLIST_REMOVE(dir_ace, ace);
3273                                         SAFE_FREE(ace);
3274
3275                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3276                                         if (ace && !ace->perms) {
3277                                                 DLIST_REMOVE(file_ace, ace);
3278                                                 SAFE_FREE(ace);
3279                                         }
3280                                 }
3281
3282                                 /*
3283                                  * WinNT doesn't usually have Creator Group
3284                                  * in browse lists, so we send this entry to
3285                                  * WinNT even if it contains no relevant
3286                                  * permissions. Once we can add
3287                                  * Creator Group to browse lists we can
3288                                  * re-enable this.
3289                                  */
3290
3291 #if 0
3292                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3293                                 if (ace && !ace->perms) {
3294                                         DLIST_REMOVE(dir_ace, ace);
3295                                         SAFE_FREE(ace);
3296                                 }
3297 #endif
3298
3299                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3300                                 if (ace && !ace->perms) {
3301                                         DLIST_REMOVE(file_ace, ace);
3302                                         SAFE_FREE(ace);
3303                                 }
3304                         }
3305
3306                         num_acls = count_canon_ace_list(file_ace);
3307                         num_def_acls = count_canon_ace_list(dir_ace);
3308
3309                         /* Allocate the ace list. */
3310                         if ((nt_ace_list = SMB_MALLOC_ARRAY(struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3311                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3312                                 goto done;
3313                         }
3314
3315                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3316
3317                         /*
3318                          * Create the NT ACE list from the canonical ace lists.
3319                          */
3320
3321                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3322                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3323                                                 &nt_acl_type,
3324                                                 ace->perms,
3325                                                 S_ISDIR(sbuf->st_ex_mode));
3326                                 init_sec_ace(&nt_ace_list[num_aces++],
3327                                         &ace->trustee,
3328                                         nt_acl_type,
3329                                         acc,
3330                                         ace->ace_flags);
3331                         }
3332
3333                         /* The User must have access to a profile share - even
3334                          * if we can't map the SID. */
3335                         if (lp_profile_acls(SNUM(conn))) {
3336                                 add_or_replace_ace(nt_ace_list, &num_aces,
3337                                                    &global_sid_Builtin_Users,
3338                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3339                                                    FILE_GENERIC_ALL, 0);
3340                         }
3341
3342                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3343                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3344                                                 &nt_acl_type,
3345                                                 ace->perms,
3346                                                 S_ISDIR(sbuf->st_ex_mode));
3347                                 init_sec_ace(&nt_ace_list[num_aces++],
3348                                         &ace->trustee,
3349                                         nt_acl_type,
3350                                         acc,
3351                                         ace->ace_flags |
3352                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3353                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3354                                         SEC_ACE_FLAG_INHERIT_ONLY);
3355                         }
3356
3357                         /* The User must have access to a profile share - even
3358                          * if we can't map the SID. */
3359                         if (lp_profile_acls(SNUM(conn))) {
3360                                 add_or_replace_ace(nt_ace_list, &num_aces,
3361                                                 &global_sid_Builtin_Users,
3362                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3363                                                 FILE_GENERIC_ALL,
3364                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3365                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3366                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3367                         }
3368
3369                         /*
3370                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3371                          * Win2K needs this to get the inheritance correct when replacing ACLs
3372                          * on a directory tree. Based on work by Jim @ IBM.
3373                          */
3374
3375                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3376
3377                         if (lp_profile_acls(SNUM(conn))) {
3378                                 for (i = 0; i < num_aces; i++) {
3379                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3380                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3381                                                                    &orig_owner_sid,
3382                                                                    nt_ace_list[i].type,
3383                                                                    nt_ace_list[i].access_mask,
3384                                                                    nt_ace_list[i].flags);
3385                                                 break;
3386                                         }
3387                                 }
3388                         }
3389                 }
3390
3391                 if (num_aces) {
3392                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3393                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3394                                 goto done;
3395                         }
3396                 }
3397         } /* security_info & SECINFO_DACL */
3398
3399         psd = make_standard_sec_desc( talloc_tos(),
3400                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3401                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3402                         psa,
3403                         &sd_size);
3404
3405         if(!psd) {
3406                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3407                 sd_size = 0;
3408                 goto done;
3409         }
3410
3411         /*
3412          * Windows 2000: The DACL_PROTECTED flag in the security
3413          * descriptor marks the ACL as non-inheriting, i.e., no
3414          * ACEs from higher level directories propagate to this
3415          * ACL. In the POSIX ACL model permissions are only
3416          * inherited at file create time, so ACLs never contain
3417          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3418          * flag doesn't seem to bother Windows NT.
3419          * Always set this if map acl inherit is turned off.
3420          */
3421         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3422                 psd->type |= SEC_DESC_DACL_PROTECTED;
3423         } else {
3424                 psd->type |= pal->sd_type;
3425         }
3426
3427         if (psd->dacl) {
3428                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3429         }
3430
3431         *ppdesc = psd;
3432
3433  done:
3434
3435         if (posix_acl) {
3436                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3437         }
3438         if (def_acl) {
3439                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3440         }
3441         free_canon_ace_list(file_ace);
3442         free_canon_ace_list(dir_ace);
3443         free_inherited_info(pal);
3444         SAFE_FREE(nt_ace_list);
3445
3446         return NT_STATUS_OK;
3447 }
3448
3449 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3450                            struct security_descriptor **ppdesc)
3451 {
3452         SMB_STRUCT_STAT sbuf;
3453         SMB_ACL_T posix_acl = NULL;
3454         struct pai_val *pal;
3455
3456         *ppdesc = NULL;
3457
3458         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3459                   fsp_str_dbg(fsp)));
3460
3461         /* can it happen that fsp_name == NULL ? */
3462         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3463                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3464                                         security_info, ppdesc);
3465         }
3466
3467         /* Get the stat struct for the owner info. */
3468         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3469                 return map_nt_error_from_unix(errno);
3470         }
3471
3472         /* Get the ACL from the fd. */
3473         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3474
3475         pal = fload_inherited_info(fsp);
3476
3477         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3478                                        &sbuf, pal, posix_acl, NULL,
3479                                        security_info, ppdesc);
3480 }
3481
3482 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3483                           uint32_t security_info, struct security_descriptor **ppdesc)
3484 {
3485         SMB_ACL_T posix_acl = NULL;
3486         SMB_ACL_T def_acl = NULL;
3487         struct pai_val *pal;
3488         struct smb_filename smb_fname;
3489         int ret;
3490
3491         *ppdesc = NULL;
3492
3493         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3494
3495         ZERO_STRUCT(smb_fname);
3496         smb_fname.base_name = discard_const_p(char, name);
3497
3498         /* Get the stat struct for the owner info. */
3499         if (lp_posix_pathnames()) {
3500                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3501         } else {
3502                 ret = SMB_VFS_STAT(conn, &smb_fname);
3503         }
3504
3505         if (ret == -1) {
3506                 return map_nt_error_from_unix(errno);
3507         }
3508
3509         /* Get the ACL from the path. */
3510         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3511
3512         /* If it's a directory get the default POSIX ACL. */
3513         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3514                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3515                 def_acl = free_empty_sys_acl(conn, def_acl);
3516         }
3517
3518         pal = load_inherited_info(conn, name);
3519
3520         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3521                                        posix_acl, def_acl, security_info,
3522                                        ppdesc);
3523 }
3524
3525 /****************************************************************************
3526  Try to chown a file. We will be able to chown it under the following conditions.
3527
3528   1) If we have root privileges, then it will just work.
3529   2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3530   3) If we have SeRestorePrivilege we can change the user to any other user.
3531   4) If we have write permission to the file and dos_filemodes is set
3532      then allow chown to the currently authenticated user.
3533 ****************************************************************************/
3534
3535 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3536               uid_t uid, gid_t gid)
3537 {
3538         int ret;
3539         files_struct *fsp;
3540
3541         if(!CAN_WRITE(conn)) {
3542                 return -1;
3543         }
3544
3545         /* Case (1). */
3546         /* try the direct way first */
3547         if (lp_posix_pathnames()) {
3548                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3549         } else {
3550                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3551         }
3552
3553         if (ret == 0)
3554                 return 0;
3555
3556         /* Case (2) / (3) */
3557         if (lp_enable_privileges()) {
3558
3559                 bool has_take_ownership_priv = security_token_has_privilege(get_current_nttok(conn), SEC_PRIV_TAKE_OWNERSHIP);
3560                 bool has_restore_priv = security_token_has_privilege(get_current_nttok(conn), SEC_PRIV_RESTORE);
3561
3562                 /* Case (2) */
3563                 if ( ( has_take_ownership_priv && ( uid == get_current_uid(conn) ) ) ||
3564                 /* Case (3) */
3565                      ( has_restore_priv ) ) {
3566
3567                         become_root();
3568                         /* Keep the current file gid the same - take ownership doesn't imply group change. */
3569                         if (lp_posix_pathnames()) {
3570                                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3571                                                     (gid_t)-1);
3572                         } else {
3573                                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3574                                                     (gid_t)-1);
3575                         }
3576                         unbecome_root();
3577                         return ret;
3578                 }
3579         }
3580
3581         /* Case (4). */
3582         if (!lp_dos_filemode(SNUM(conn))) {
3583                 errno = EPERM;
3584                 return -1;
3585         }
3586
3587         /* only allow chown to the current user. This is more secure,
3588            and also copes with the case where the SID in a take ownership ACL is
3589            a local SID on the users workstation
3590         */
3591         if (uid != get_current_uid(conn)) {
3592                 errno = EPERM;
3593                 return -1;
3594         }
3595
3596         if (lp_posix_pathnames()) {
3597                 ret = SMB_VFS_LSTAT(conn, smb_fname);
3598         } else {
3599                 ret = SMB_VFS_STAT(conn, smb_fname);
3600         }
3601
3602         if (ret == -1) {
3603                 return -1;
3604         }
3605
3606         if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, smb_fname, &fsp))) {
3607                 return -1;
3608         }
3609
3610         become_root();
3611         /* Keep the current file gid the same. */
3612         if (fsp->fh->fd == -1) {
3613                 if (lp_posix_pathnames()) {
3614                         ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3615                                             (gid_t)-1);
3616                 } else {
3617                         ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3618                                             (gid_t)-1);
3619                 }
3620         } else {
3621                 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3622         }
3623         unbecome_root();
3624
3625         close_file_fchmod(NULL, fsp);
3626
3627         return ret;
3628 }
3629
3630 #if 0
3631 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3632
3633 /****************************************************************************
3634  Take care of parent ACL inheritance.
3635 ****************************************************************************/
3636
3637 NTSTATUS append_parent_acl(files_struct *fsp,
3638                                 const struct security_descriptor *pcsd,
3639                                 struct security_descriptor **pp_new_sd)
3640 {
3641         struct smb_filename *smb_dname = NULL;
3642         struct security_descriptor *parent_sd = NULL;
3643         files_struct *parent_fsp = NULL;
3644         TALLOC_CTX *mem_ctx = talloc_tos();
3645         char *parent_name = NULL;
3646         struct security_ace *new_ace = NULL;
3647         unsigned int num_aces = pcsd->dacl->num_aces;
3648         NTSTATUS status;
3649         int info;
3650         unsigned int i, j;
3651         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3652         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3653
3654         if (psd == NULL) {
3655                 return NT_STATUS_NO_MEMORY;
3656         }
3657
3658         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3659                             NULL)) {
3660                 return NT_STATUS_NO_MEMORY;
3661         }
3662
3663         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3664                                             &smb_dname);
3665         if (!NT_STATUS_IS_OK(status)) {
3666                 goto fail;
3667         }
3668
3669         status = SMB_VFS_CREATE_FILE(
3670                 fsp->conn,                              /* conn */
3671                 NULL,                                   /* req */
3672                 0,                                      /* root_dir_fid */
3673                 smb_dname,                              /* fname */
3674                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3675                 FILE_SHARE_NONE,                        /* share_access */
3676                 FILE_OPEN,                              /* create_disposition*/
3677                 FILE_DIRECTORY_FILE,                    /* create_options */
3678                 0,                                      /* file_attributes */
3679                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3680                 0,                                      /* allocation_size */
3681                 NULL,                                   /* sd */
3682                 NULL,                                   /* ea_list */
3683                 &parent_fsp,                            /* result */
3684                 &info);                                 /* pinfo */
3685
3686         if (!NT_STATUS_IS_OK(status)) {
3687                 TALLOC_FREE(smb_dname);
3688                 return status;
3689         }
3690
3691         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3692                                     SECINFO_DACL, &parent_sd );
3693
3694         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3695         TALLOC_FREE(smb_dname);
3696
3697         if (!NT_STATUS_IS_OK(status)) {
3698                 return status;
3699         }
3700
3701         /*
3702          * Make room for potentially all the ACLs from
3703          * the parent. We used to add the ugw triple here,
3704          * as we knew we were dealing with POSIX ACLs.
3705          * We no longer need to do so as we can guarentee
3706          * that a default ACL from the parent directory will
3707          * be well formed for POSIX ACLs if it came from a
3708          * POSIX ACL source, and if we're not writing to a
3709          * POSIX ACL sink then we don't care if it's not well
3710          * formed. JRA.
3711          */
3712
3713         num_aces += parent_sd->dacl->num_aces;
3714
3715         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, struct security_ace,
3716                                         num_aces)) == NULL) {
3717                 return NT_STATUS_NO_MEMORY;
3718         }
3719
3720         /* Start by copying in all the given ACE entries. */
3721         for (i = 0; i < psd->dacl->num_aces; i++) {
3722                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3723         }
3724
3725         /*
3726          * Note that we're ignoring "inherit permissions" here
3727          * as that really only applies to newly created files. JRA.
3728          */
3729
3730         /* Finally append any inherited ACEs. */
3731         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3732                 struct security_ace *se = &parent_sd->dacl->aces[j];
3733
3734                 if (fsp->is_directory) {
3735                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3736                                 /* Doesn't apply to a directory - ignore. */
3737                                 DEBUG(10,("append_parent_acl: directory %s "
3738                                         "ignoring non container "
3739                                         "inherit flags %u on ACE with sid %s "
3740                                         "from parent %s\n",
3741                                         fsp_str_dbg(fsp),
3742                                         (unsigned int)se->flags,
3743                                         sid_string_dbg(&se->trustee),
3744                                         parent_name));
3745                                 continue;
3746                         }
3747                 } else {
3748                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3749                                 /* Doesn't apply to a file - ignore. */
3750                                 DEBUG(10,("append_parent_acl: file %s "
3751                                         "ignoring non object "
3752                                         "inherit flags %u on ACE with sid %s "
3753                                         "from parent %s\n",
3754                                         fsp_str_dbg(fsp),
3755                                         (unsigned int)se->flags,
3756                                         sid_string_dbg(&se->trustee),
3757                                         parent_name));
3758                                 continue;
3759                         }
3760                 }
3761
3762                 if (is_dacl_protected) {
3763                         /* If the DACL is protected it means we must
3764                          * not overwrite an existing ACE entry with the
3765                          * same SID. This is order N^2. Ouch :-(. JRA. */
3766                         unsigned int k;
3767                         for (k = 0; k < psd->dacl->num_aces; k++) {
3768                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3769                                                 &se->trustee)) {
3770                                         break;
3771                                 }
3772                         }
3773                         if (k < psd->dacl->num_aces) {
3774                                 /* SID matched. Ignore. */
3775                                 DEBUG(10,("append_parent_acl: path %s "
3776                                         "ignoring ACE with protected sid %s "
3777                                         "from parent %s\n",
3778                                         fsp_str_dbg(fsp),
3779                                         sid_string_dbg(&se->trustee),
3780                                         parent_name));
3781                                 continue;
3782                         }
3783                 }
3784
3785                 sec_ace_copy(&new_ace[i], se);
3786                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3787                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3788                 }
3789                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3790
3791                 if (fsp->is_directory) {
3792                         /*
3793                          * Strip off any inherit only. It's applied.
3794                          */
3795                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3796                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3797                                 /* No further inheritance. */
3798                                 new_ace[i].flags &=
3799                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3800                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3801                         }
3802                 } else {
3803                         /*
3804                          * Strip off any container or inherit
3805                          * flags, they can't apply to objects.
3806                          */
3807                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3808                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3809                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3810                 }
3811                 i++;
3812
3813                 DEBUG(10,("append_parent_acl: path %s "
3814                         "inheriting ACE with sid %s "
3815                         "from parent %s\n",
3816                         fsp_str_dbg(fsp),
3817                         sid_string_dbg(&se->trustee),
3818                         parent_name));
3819         }
3820
3821         psd->dacl->aces = new_ace;
3822         psd->dacl->num_aces = i;
3823         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3824                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
3825
3826         *pp_new_sd = psd;
3827         return status;
3828 }
3829 #endif
3830
3831 /****************************************************************************
3832  Reply to set a security descriptor on an fsp. security_info_sent is the
3833  description of the following NT ACL.
3834  This should be the only external function needed for the UNIX style set ACL.
3835  We make a copy of psd_orig as internal functions modify the elements inside
3836  it, even though it's a const pointer.
3837 ****************************************************************************/
3838
3839 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3840 {
3841         connection_struct *conn = fsp->conn;
3842         uid_t user = (uid_t)-1;
3843         gid_t grp = (gid_t)-1;
3844         struct dom_sid file_owner_sid;
3845         struct dom_sid file_grp_sid;
3846         canon_ace *file_ace_list = NULL;
3847         canon_ace *dir_ace_list = NULL;
3848         bool acl_perms = False;
3849         mode_t orig_mode = (mode_t)0;
3850         NTSTATUS status;
3851         bool set_acl_as_root = false;
3852         bool acl_set_support = false;
3853         bool ret = false;
3854         struct security_descriptor *psd = NULL;
3855
3856         DEBUG(10,("set_nt_acl: called for file %s\n",
3857                   fsp_str_dbg(fsp)));
3858
3859         if (!CAN_WRITE(conn)) {
3860                 DEBUG(10,("set acl rejected on read-only share\n"));
3861                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3862         }
3863
3864         if (!psd_orig) {
3865                 return NT_STATUS_INVALID_PARAMETER;
3866         }
3867
3868         psd = dup_sec_desc(talloc_tos(), psd_orig);
3869         if (!psd) {
3870                 return NT_STATUS_NO_MEMORY;
3871         }
3872
3873         /*
3874          * Get the current state of the file.
3875          */
3876
3877         status = vfs_stat_fsp(fsp);
3878         if (!NT_STATUS_IS_OK(status)) {
3879                 return status;
3880         }
3881
3882         /* Save the original element we check against. */
3883         orig_mode = fsp->fsp_name->st.st_ex_mode;
3884
3885         /*
3886          * Unpack the user/group/world id's.
3887          */
3888
3889         /* POSIX can't cope with missing owner/group. */
3890         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3891                 security_info_sent &= ~SECINFO_OWNER;
3892         }
3893         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3894                 security_info_sent &= ~SECINFO_GROUP;
3895         }
3896
3897         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3898         if (!NT_STATUS_IS_OK(status)) {
3899                 return status;
3900         }
3901
3902         /*
3903          * Do we need to chown ? If so this must be done first as the incoming
3904          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3905          * Noticed by Simo.
3906          */
3907
3908         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3909             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3910
3911                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3912                          fsp_str_dbg(fsp), (unsigned int)user,
3913                          (unsigned int)grp));
3914
3915                 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3916                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3917                                  "= %s.\n", fsp_str_dbg(fsp),
3918                                  (unsigned int)user, (unsigned int)grp,
3919                                  strerror(errno)));
3920                         if (errno == EPERM) {
3921                                 return NT_STATUS_INVALID_OWNER;
3922                         }
3923                         return map_nt_error_from_unix(errno);
3924                 }
3925
3926                 /*
3927                  * Recheck the current state of the file, which may have changed.
3928                  * (suid/sgid bits, for instance)
3929                  */
3930
3931                 status = vfs_stat_fsp(fsp);
3932                 if (!NT_STATUS_IS_OK(status)) {
3933                         return status;
3934                 }
3935
3936                 /* Save the original element we check against. */
3937                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3938
3939                 /* If we successfully chowned, we know we must
3940                  * be able to set the acl, so do it as root.
3941                  */
3942                 set_acl_as_root = true;
3943         }
3944
3945         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3946
3947         if((security_info_sent & SECINFO_DACL) &&
3948                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3949                         (psd->dacl == NULL)) {
3950                 struct security_ace ace[3];
3951
3952                 /* We can't have NULL DACL in POSIX.
3953                    Use owner/group/Everyone -> full access. */
3954
3955                 init_sec_ace(&ace[0],
3956                                 &file_owner_sid,
3957                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3958                                 GENERIC_ALL_ACCESS,
3959                                 0);
3960                 init_sec_ace(&ace[1],
3961                                 &file_grp_sid,
3962                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3963                                 GENERIC_ALL_ACCESS,
3964                                 0);
3965                 init_sec_ace(&ace[2],
3966                                 &global_sid_World,
3967                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3968                                 GENERIC_ALL_ACCESS,
3969                                 0);
3970                 psd->dacl = make_sec_acl(talloc_tos(),
3971                                         NT4_ACL_REVISION,
3972                                         3,
3973                                         ace);
3974                 if (psd->dacl == NULL) {
3975                         return NT_STATUS_NO_MEMORY;
3976                 }
3977                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3978         }
3979
3980         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3981                                      &file_grp_sid, &file_ace_list,
3982                                      &dir_ace_list, security_info_sent, psd);
3983
3984         /* Ignore W2K traverse DACL set. */
3985         if (!file_ace_list && !dir_ace_list) {
3986                 return NT_STATUS_OK;
3987         }
3988
3989         if (!acl_perms) {
3990                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3991                 free_canon_ace_list(file_ace_list);
3992                 free_canon_ace_list(dir_ace_list);
3993                 return NT_STATUS_ACCESS_DENIED;
3994         }
3995
3996         /*
3997          * Only change security if we got a DACL.
3998          */
3999
4000         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
4001                 free_canon_ace_list(file_ace_list);
4002                 free_canon_ace_list(dir_ace_list);
4003                 return NT_STATUS_OK;
4004         }
4005
4006         /*
4007          * Try using the POSIX ACL set first. Fall back to chmod if
4008          * we have no ACL support on this filesystem.
4009          */
4010
4011         if (acl_perms && file_ace_list) {
4012                 if (set_acl_as_root) {
4013                         become_root();
4014                 }
4015                 ret = set_canon_ace_list(fsp, file_ace_list, false,
4016                                          &fsp->fsp_name->st, &acl_set_support);
4017                 if (set_acl_as_root) {
4018                         unbecome_root();
4019                 }
4020                 if (acl_set_support && ret == false) {
4021                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
4022                                  "%s (%s).\n", fsp_str_dbg(fsp),
4023                                  strerror(errno)));
4024                         free_canon_ace_list(file_ace_list);
4025                         free_canon_ace_list(dir_ace_list);
4026                         return map_nt_error_from_unix(errno);
4027                 }
4028         }
4029
4030         if (acl_perms && acl_set_support && fsp->is_directory) {
4031                 if (dir_ace_list) {
4032                         if (set_acl_as_root) {
4033                                 become_root();
4034                         }
4035                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
4036                                                  &fsp->fsp_name->st,
4037                                                  &acl_set_support);
4038                         if (set_acl_as_root) {
4039                                 unbecome_root();
4040                         }
4041                         if (ret == false) {
4042                                 DEBUG(3,("set_nt_acl: failed to set default "
4043                                          "acl on directory %s (%s).\n",
4044                                          fsp_str_dbg(fsp), strerror(errno)));
4045                                 free_canon_ace_list(file_ace_list);
4046                                 free_canon_ace_list(dir_ace_list);
4047                                 return map_nt_error_from_unix(errno);
4048                         }
4049                 } else {
4050                         int sret = -1;
4051
4052                         /*
4053                          * No default ACL - delete one if it exists.
4054                          */
4055
4056                         if (set_acl_as_root) {
4057                                 become_root();
4058                         }
4059                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4060                             fsp->fsp_name->base_name);
4061                         if (set_acl_as_root) {
4062                                 unbecome_root();
4063                         }
4064                         if (sret == -1) {
4065                                 if (acl_group_override(conn, fsp->fsp_name)) {
4066                                         DEBUG(5,("set_nt_acl: acl group "
4067                                                  "control on and current user "
4068                                                  "in file %s primary group. "
4069                                                  "Override delete_def_acl\n",
4070                                                  fsp_str_dbg(fsp)));
4071
4072                                         become_root();
4073                                         sret =
4074                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4075                                                     conn,
4076                                                     fsp->fsp_name->base_name);
4077                                         unbecome_root();
4078                                 }
4079
4080                                 if (sret == -1) {
4081                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4082                                         free_canon_ace_list(file_ace_list);
4083                                         free_canon_ace_list(dir_ace_list);
4084                                         return map_nt_error_from_unix(errno);
4085                                 }
4086                         }
4087                 }
4088         }
4089
4090         if (acl_set_support) {
4091                 if (set_acl_as_root) {
4092                         become_root();
4093                 }
4094                 store_inheritance_attributes(fsp,
4095                                 file_ace_list,
4096                                 dir_ace_list,
4097                                 psd->type);
4098                 if (set_acl_as_root) {
4099                         unbecome_root();
4100                 }
4101         }
4102
4103         /*
4104          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4105          */
4106
4107         if(!acl_set_support && acl_perms) {
4108                 mode_t posix_perms;
4109
4110                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4111                         free_canon_ace_list(file_ace_list);
4112                         free_canon_ace_list(dir_ace_list);
4113                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4114                                  "posix permissions for file %s.\n",
4115                                  fsp_str_dbg(fsp)));
4116                         return NT_STATUS_ACCESS_DENIED;
4117                 }
4118
4119                 if (orig_mode != posix_perms) {
4120                         int sret = -1;
4121
4122                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4123                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4124
4125                         if (set_acl_as_root) {
4126                                 become_root();
4127                         }
4128                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4129                                              posix_perms);
4130                         if (set_acl_as_root) {
4131                                 unbecome_root();
4132                         }
4133                         if(sret == -1) {
4134                                 if (acl_group_override(conn, fsp->fsp_name)) {
4135                                         DEBUG(5,("set_nt_acl: acl group "
4136                                                  "control on and current user "
4137                                                  "in file %s primary group. "
4138                                                  "Override chmod\n",
4139                                                  fsp_str_dbg(fsp)));
4140
4141                                         become_root();
4142                                         sret = SMB_VFS_CHMOD(conn,
4143                                             fsp->fsp_name->base_name,
4144                                             posix_perms);
4145                                         unbecome_root();
4146                                 }
4147
4148                                 if (sret == -1) {
4149                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4150                                                  "failed. Error = %s.\n",
4151                                                  fsp_str_dbg(fsp),
4152                                                  (unsigned int)posix_perms,
4153                                                  strerror(errno)));
4154                                         free_canon_ace_list(file_ace_list);
4155                                         free_canon_ace_list(dir_ace_list);
4156                                         return map_nt_error_from_unix(errno);
4157                                 }
4158                         }
4159                 }
4160         }
4161
4162         free_canon_ace_list(file_ace_list);
4163         free_canon_ace_list(dir_ace_list);
4164
4165         /* Ensure the stat struct in the fsp is correct. */
4166         status = vfs_stat_fsp(fsp);
4167
4168         return NT_STATUS_OK;
4169 }
4170
4171 /****************************************************************************
4172  Get the actual group bits stored on a file with an ACL. Has no effect if
4173  the file has no ACL. Needed in dosmode code where the stat() will return
4174  the mask bits, not the real group bits, for a file with an ACL.
4175 ****************************************************************************/
4176
4177 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4178 {
4179         int entry_id = SMB_ACL_FIRST_ENTRY;
4180         SMB_ACL_ENTRY_T entry;
4181         SMB_ACL_T posix_acl;
4182         int result = -1;
4183
4184         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4185         if (posix_acl == (SMB_ACL_T)NULL)
4186                 return -1;
4187
4188         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4189                 SMB_ACL_TAG_T tagtype;
4190                 SMB_ACL_PERMSET_T permset;
4191
4192                 entry_id = SMB_ACL_NEXT_ENTRY;
4193
4194                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4195                         break;
4196
4197                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4198                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4199                                 break;
4200                         } else {
4201                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4202                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4203                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4204                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4205                                 result = 0;
4206                                 break;
4207                         }
4208                 }
4209         }
4210         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4211         return result;
4212 }
4213
4214 /****************************************************************************
4215  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4216  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4217 ****************************************************************************/
4218
4219 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4220 {
4221         int entry_id = SMB_ACL_FIRST_ENTRY;
4222         SMB_ACL_ENTRY_T entry;
4223         int num_entries = 0;
4224
4225         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4226                 SMB_ACL_TAG_T tagtype;
4227                 SMB_ACL_PERMSET_T permset;
4228                 mode_t perms;
4229
4230                 entry_id = SMB_ACL_NEXT_ENTRY;
4231
4232                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4233                         return -1;
4234
4235                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4236                         return -1;
4237
4238                 num_entries++;
4239
4240                 switch(tagtype) {
4241                         case SMB_ACL_USER_OBJ:
4242                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4243                                 break;
4244                         case SMB_ACL_GROUP_OBJ:
4245                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4246                                 break;
4247                         case SMB_ACL_MASK:
4248                                 /*
4249                                  * FIXME: The ACL_MASK entry permissions should really be set to
4250                                  * the union of the permissions of all ACL_USER,
4251                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4252                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4253                                  */
4254                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4255                                 break;
4256                         case SMB_ACL_OTHER:
4257                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4258                                 break;
4259                         default:
4260                                 continue;
4261                 }
4262
4263                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4264                         return -1;
4265
4266                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4267                         return -1;
4268         }
4269
4270         /*
4271          * If this is a simple 3 element ACL or no elements then it's a standard
4272          * UNIX permission set. Just use chmod...
4273          */
4274
4275         if ((num_entries == 3) || (num_entries == 0))
4276                 return -1;
4277
4278         return 0;
4279 }
4280
4281 /****************************************************************************
4282  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4283  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4284  resulting ACL on TO.  Note that name is in UNIX character set.
4285 ****************************************************************************/
4286
4287 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4288 {
4289         SMB_ACL_T posix_acl = NULL;
4290         int ret = -1;
4291
4292         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4293                 return -1;
4294
4295         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4296                 goto done;
4297
4298         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4299
4300  done:
4301
4302         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4303         return ret;
4304 }
4305
4306 /****************************************************************************
4307  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4308  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4309  Note that name is in UNIX character set.
4310 ****************************************************************************/
4311
4312 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4313 {
4314         return copy_access_posix_acl(conn, name, name, mode);
4315 }
4316
4317 /****************************************************************************
4318  Check for an existing default POSIX ACL on a directory.
4319 ****************************************************************************/
4320
4321 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4322 {
4323         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4324         bool has_acl = False;
4325         SMB_ACL_ENTRY_T entry;
4326
4327         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4328                 has_acl = True;
4329         }
4330
4331         if (def_acl) {
4332                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4333         }
4334         return has_acl;
4335 }
4336
4337 /****************************************************************************
4338  If the parent directory has no default ACL but it does have an Access ACL,
4339  inherit this Access ACL to file name.
4340 ****************************************************************************/
4341
4342 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4343                        const char *name, mode_t mode)
4344 {
4345         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4346                 return 0;
4347
4348         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4349 }
4350
4351 /****************************************************************************
4352  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4353  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4354 ****************************************************************************/
4355
4356 int fchmod_acl(files_struct *fsp, mode_t mode)
4357 {
4358         connection_struct *conn = fsp->conn;
4359         SMB_ACL_T posix_acl = NULL;
4360         int ret = -1;
4361
4362         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4363                 return -1;
4364
4365         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4366                 goto done;
4367
4368         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4369
4370   done:
4371
4372         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4373         return ret;
4374 }
4375
4376 /****************************************************************************
4377  Map from wire type to permset.
4378 ****************************************************************************/
4379
4380 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4381 {
4382         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4383                 return False;
4384         }
4385
4386         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4387                 return False;
4388         }
4389
4390         if (wire_perm & SMB_POSIX_ACL_READ) {
4391                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4392                         return False;
4393                 }
4394         }
4395         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4396                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4397                         return False;
4398                 }
4399         }
4400         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4401                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4402                         return False;
4403                 }
4404         }
4405         return True;
4406 }
4407
4408 /****************************************************************************
4409  Map from wire type to tagtype.
4410 ****************************************************************************/
4411
4412 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4413 {
4414         switch (wire_tt) {
4415                 case SMB_POSIX_ACL_USER_OBJ:
4416                         *p_tt = SMB_ACL_USER_OBJ;
4417                         break;
4418                 case SMB_POSIX_ACL_USER:
4419                         *p_tt = SMB_ACL_USER;
4420                         break;
4421                 case SMB_POSIX_ACL_GROUP_OBJ:
4422                         *p_tt = SMB_ACL_GROUP_OBJ;
4423                         break;
4424                 case SMB_POSIX_ACL_GROUP:
4425                         *p_tt = SMB_ACL_GROUP;
4426                         break;
4427                 case SMB_POSIX_ACL_MASK:
4428                         *p_tt = SMB_ACL_MASK;
4429                         break;
4430                 case SMB_POSIX_ACL_OTHER:
4431                         *p_tt = SMB_ACL_OTHER;
4432                         break;
4433                 default:
4434                         return False;
4435         }
4436         return True;
4437 }
4438
4439 /****************************************************************************
4440  Create a new POSIX acl from wire permissions.
4441  FIXME ! How does the share mask/mode fit into this.... ?
4442 ****************************************************************************/
4443
4444 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4445 {
4446         unsigned int i;
4447         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4448
4449         if (the_acl == NULL) {
4450                 return NULL;
4451         }
4452
4453         for (i = 0; i < num_acls; i++) {
4454                 SMB_ACL_ENTRY_T the_entry;
4455                 SMB_ACL_PERMSET_T the_permset;
4456                 SMB_ACL_TAG_T tag_type;
4457
4458                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4459                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4460                                 i, strerror(errno) ));
4461                         goto fail;
4462                 }
4463
4464                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4465                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4466                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4467                         goto fail;
4468                 }
4469
4470                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4471                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4472                                 i, strerror(errno) ));
4473                         goto fail;
4474                 }
4475
4476                 /* Get the permset pointer from the new ACL entry. */
4477                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4478                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4479                                 i, strerror(errno) ));
4480                         goto fail;
4481                 }
4482
4483                 /* Map from wire to permissions. */
4484                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4485                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4486                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4487                         goto fail;
4488                 }
4489
4490                 /* Now apply to the new ACL entry. */
4491                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4492                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4493                                 i, strerror(errno) ));
4494                         goto fail;
4495                 }
4496
4497                 if (tag_type == SMB_ACL_USER) {
4498                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4499                         uid_t uid = (uid_t)uidval;
4500                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4501                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4502                                         (unsigned int)uid, i, strerror(errno) ));
4503                                 goto fail;
4504                         }
4505                 }
4506
4507                 if (tag_type == SMB_ACL_GROUP) {
4508                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4509                         gid_t gid = (uid_t)gidval;
4510                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4511                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4512                                         (unsigned int)gid, i, strerror(errno) ));
4513                                 goto fail;
4514                         }
4515                 }
4516         }
4517
4518         return the_acl;
4519
4520  fail:
4521
4522         if (the_acl != NULL) {
4523                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4524         }
4525         return NULL;
4526 }
4527
4528 /****************************************************************************
4529  Calls from UNIX extensions - Default POSIX ACL set.
4530  If num_def_acls == 0 and not a directory just return. If it is a directory
4531  and num_def_acls == 0 then remove the default acl. Else set the default acl
4532  on the directory.
4533 ****************************************************************************/
4534
4535 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4536                                 uint16 num_def_acls, const char *pdata)
4537 {
4538         SMB_ACL_T def_acl = NULL;
4539
4540         if (!S_ISDIR(psbuf->st_ex_mode)) {
4541                 if (num_def_acls) {
4542                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4543                         errno = EISDIR;
4544                         return False;
4545                 } else {
4546                         return True;
4547                 }
4548         }
4549
4550         if (!num_def_acls) {
4551                 /* Remove the default ACL. */
4552                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4553                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4554                                 fname, strerror(errno) ));
4555                         return False;
4556                 }
4557                 return True;
4558         }
4559
4560         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4561                 return False;
4562         }
4563
4564         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4565                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4566                         fname, strerror(errno) ));
4567                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4568                 return False;
4569         }
4570
4571         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4572         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4573         return True;
4574 }
4575
4576 /****************************************************************************
4577  Remove an ACL from a file. As we don't have acl_delete_entry() available
4578  we must read the current acl and copy all entries except MASK, USER and GROUP
4579  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4580  removed.
4581  FIXME ! How does the share mask/mode fit into this.... ?
4582 ****************************************************************************/
4583
4584 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4585 {
4586         SMB_ACL_T file_acl = NULL;
4587         int entry_id = SMB_ACL_FIRST_ENTRY;
4588         SMB_ACL_ENTRY_T entry;
4589         bool ret = False;
4590         /* Create a new ACL with only 3 entries, u/g/w. */
4591         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4592         SMB_ACL_ENTRY_T user_ent = NULL;
4593         SMB_ACL_ENTRY_T group_ent = NULL;
4594         SMB_ACL_ENTRY_T other_ent = NULL;
4595
4596         if (new_file_acl == NULL) {
4597                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4598                 return False;
4599         }
4600
4601         /* Now create the u/g/w entries. */
4602         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4603                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4604                         fname, strerror(errno) ));
4605                 goto done;
4606         }
4607         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4608                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4609                         fname, strerror(errno) ));
4610                 goto done;
4611         }
4612
4613         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4614                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4615                         fname, strerror(errno) ));
4616                 goto done;
4617         }
4618         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4619                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4620                         fname, strerror(errno) ));
4621                 goto done;
4622         }
4623
4624         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4625                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4626                         fname, strerror(errno) ));
4627                 goto done;
4628         }
4629         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4630                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4631                         fname, strerror(errno) ));
4632                 goto done;
4633         }
4634
4635         /* Get the current file ACL. */
4636         if (fsp && fsp->fh->fd != -1) {
4637                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4638         } else {
4639                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4640         }
4641
4642         if (file_acl == NULL) {
4643                 /* This is only returned if an error occurred. Even for a file with
4644                    no acl a u/g/w acl should be returned. */
4645                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4646                         fname, strerror(errno) ));
4647                 goto done;
4648         }
4649
4650         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4651                 SMB_ACL_TAG_T tagtype;
4652                 SMB_ACL_PERMSET_T permset;
4653
4654                 entry_id = SMB_ACL_NEXT_ENTRY;
4655
4656                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4657                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4658                                 fname, strerror(errno) ));
4659                         goto done;
4660                 }
4661
4662                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4663                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4664                                 fname, strerror(errno) ));
4665                         goto done;
4666                 }
4667
4668                 if (tagtype == SMB_ACL_USER_OBJ) {
4669                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4670                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4671                                         fname, strerror(errno) ));
4672                         }
4673                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4674                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4675                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4676                                         fname, strerror(errno) ));
4677                         }
4678                 } else if (tagtype == SMB_ACL_OTHER) {
4679                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4680                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4681                                         fname, strerror(errno) ));
4682                         }
4683                 }
4684         }
4685
4686         /* Set the new empty file ACL. */
4687         if (fsp && fsp->fh->fd != -1) {
4688                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4689                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4690                                 fname, strerror(errno) ));
4691                         goto done;
4692                 }
4693         } else {
4694                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4695                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4696                                 fname, strerror(errno) ));
4697                         goto done;
4698                 }
4699         }
4700
4701         ret = True;
4702
4703  done:
4704
4705         if (file_acl) {
4706                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4707         }
4708         if (new_file_acl) {
4709                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4710         }
4711         return ret;
4712 }
4713
4714 /****************************************************************************
4715  Calls from UNIX extensions - POSIX ACL set.
4716  If num_def_acls == 0 then read/modify/write acl after removing all entries
4717  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4718 ****************************************************************************/
4719
4720 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4721 {
4722         SMB_ACL_T file_acl = NULL;
4723
4724         if (!num_acls) {
4725                 /* Remove the ACL from the file. */
4726                 return remove_posix_acl(conn, fsp, fname);
4727         }
4728
4729         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4730                 return False;
4731         }
4732
4733         if (fsp && fsp->fh->fd != -1) {
4734                 /* The preferred way - use an open fd. */
4735                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4736                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4737                                 fname, strerror(errno) ));
4738                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4739                         return False;
4740                 }
4741         } else {
4742                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4743                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4744                                 fname, strerror(errno) ));
4745                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4746                         return False;
4747                 }
4748         }
4749
4750         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4751         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4752         return True;
4753 }
4754
4755 /********************************************************************
4756  Pull the NT ACL from a file on disk or the OpenEventlog() access
4757  check.  Caller is responsible for freeing the returned security
4758  descriptor via TALLOC_FREE().  This is designed for dealing with
4759  user space access checks in smbd outside of the VFS.  For example,
4760  checking access rights in OpenEventlog().
4761
4762  Assume we are dealing with files (for now)
4763 ********************************************************************/
4764
4765 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4766 {
4767         struct security_descriptor *psd, *ret_sd;
4768         connection_struct *conn;
4769         files_struct finfo;
4770         struct fd_handle fh;
4771         NTSTATUS status;
4772
4773         conn = TALLOC_ZERO_P(ctx, connection_struct);
4774         if (conn == NULL) {
4775                 DEBUG(0, ("talloc failed\n"));
4776                 return NULL;
4777         }
4778
4779         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4780                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4781                 TALLOC_FREE(conn);
4782                 return NULL;
4783         }
4784
4785         conn->params->service = -1;
4786
4787         set_conn_connectpath(conn, "/");
4788
4789         if (!smbd_vfs_init(conn)) {
4790                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4791                 conn_free(conn);
4792                 return NULL;
4793         }
4794
4795         ZERO_STRUCT( finfo );
4796         ZERO_STRUCT( fh );
4797
4798         finfo.fnum = -1;
4799         finfo.conn = conn;
4800         finfo.fh = &fh;
4801         finfo.fh->fd = -1;
4802
4803         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4804                                             &finfo.fsp_name);
4805         if (!NT_STATUS_IS_OK(status)) {
4806                 conn_free(conn);
4807                 return NULL;
4808         }
4809
4810         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4811                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4812                 TALLOC_FREE(finfo.fsp_name);
4813                 conn_free(conn);
4814                 return NULL;
4815         }
4816
4817         ret_sd = dup_sec_desc( ctx, psd );
4818
4819         TALLOC_FREE(finfo.fsp_name);
4820         conn_free(conn);
4821
4822         return ret_sd;
4823 }
4824
4825 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4826
4827 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4828                                         const char *name,
4829                                         SMB_STRUCT_STAT *psbuf,
4830                                         struct security_descriptor **ppdesc)
4831 {
4832         struct dom_sid owner_sid, group_sid;
4833         size_t size = 0;
4834         struct security_ace aces[4];
4835         uint32_t access_mask = 0;
4836         mode_t mode = psbuf->st_ex_mode;
4837         struct security_acl *new_dacl = NULL;
4838         int idx = 0;
4839
4840         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4841                 name, (int)mode ));
4842
4843         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4844         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4845
4846         /*
4847          We provide up to 4 ACEs
4848                 - Owner
4849                 - Group
4850                 - Everyone
4851                 - NT System
4852         */
4853
4854         if (mode & S_IRUSR) {
4855                 if (mode & S_IWUSR) {
4856                         access_mask |= SEC_RIGHTS_FILE_ALL;
4857                 } else {
4858                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4859                 }
4860         }
4861         if (mode & S_IWUSR) {
4862                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4863         }
4864
4865         init_sec_ace(&aces[idx],
4866                         &owner_sid,
4867                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4868                         access_mask,
4869                         0);
4870         idx++;
4871
4872         access_mask = 0;
4873         if (mode & S_IRGRP) {
4874                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4875         }
4876         if (mode & S_IWGRP) {
4877                 /* note that delete is not granted - this matches posix behaviour */
4878                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4879         }
4880         if (access_mask) {
4881                 init_sec_ace(&aces[idx],
4882                         &group_sid,
4883                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4884                         access_mask,
4885                         0);
4886                 idx++;
4887         }
4888
4889         access_mask = 0;
4890         if (mode & S_IROTH) {
4891                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4892         }
4893         if (mode & S_IWOTH) {
4894                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4895         }
4896         if (access_mask) {
4897                 init_sec_ace(&aces[idx],
4898                         &global_sid_World,
4899                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4900                         access_mask,
4901                         0);
4902                 idx++;
4903         }
4904
4905         init_sec_ace(&aces[idx],
4906                         &global_sid_System,
4907                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4908                         SEC_RIGHTS_FILE_ALL,
4909                         0);
4910         idx++;
4911
4912         new_dacl = make_sec_acl(ctx,
4913                         NT4_ACL_REVISION,
4914                         idx,
4915                         aces);
4916
4917         if (!new_dacl) {
4918                 return NT_STATUS_NO_MEMORY;
4919         }
4920
4921         *ppdesc = make_sec_desc(ctx,
4922                         SECURITY_DESCRIPTOR_REVISION_1,
4923                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4924                         &owner_sid,
4925                         &group_sid,
4926                         NULL,
4927                         new_dacl,
4928                         &size);
4929         if (!*ppdesc) {
4930                 return NT_STATUS_NO_MEMORY;
4931         }
4932         return NT_STATUS_OK;
4933 }