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 SeRestorePrivilege we can change the user + group to any other user.
3530   3) If we have SeTakeOwnershipPrivilege we can change the user to the current 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 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3536 {
3537         NTSTATUS status;
3538
3539         if(!CAN_WRITE(fsp->conn)) {
3540                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3541         }
3542
3543         /* Case (1). */
3544         status = vfs_chown_fsp(fsp, uid, gid);
3545         if (NT_STATUS_IS_OK(status)) {
3546                 return status;
3547         }
3548
3549         /* Case (2) / (3) */
3550         if (lp_enable_privileges()) {
3551                 bool has_take_ownership_priv = security_token_has_privilege(
3552                                                 get_current_nttok(fsp->conn),
3553                                                 SEC_PRIV_TAKE_OWNERSHIP);
3554                 bool has_restore_priv = security_token_has_privilege(
3555                                                 get_current_nttok(fsp->conn),
3556                                                 SEC_PRIV_RESTORE);
3557
3558                 if (has_restore_priv) {
3559                         ; /* Case (2) */
3560                 } else if (has_take_ownership_priv) {
3561                         /* Case (3) */
3562                         if (uid == get_current_uid(fsp->conn)) {
3563                                 gid = (gid_t)-1;
3564                         } else {
3565                                 has_take_ownership_priv = false;
3566                         }
3567                 }
3568
3569                 if (has_take_ownership_priv || has_restore_priv) {
3570                         become_root();
3571                         status = vfs_chown_fsp(fsp, uid, gid);
3572                         unbecome_root();
3573                         return status;
3574                 }
3575         }
3576
3577         /* Case (4). */
3578         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3579                 return NT_STATUS_ACCESS_DENIED;
3580         }
3581
3582         /* only allow chown to the current user. This is more secure,
3583            and also copes with the case where the SID in a take ownership ACL is
3584            a local SID on the users workstation
3585         */
3586         if (uid != get_current_uid(fsp->conn)) {
3587                 return NT_STATUS_ACCESS_DENIED;
3588         }
3589
3590         become_root();
3591         /* Keep the current file gid the same. */
3592         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3593         unbecome_root();
3594
3595         return status;
3596 }
3597
3598 #if 0
3599 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3600
3601 /****************************************************************************
3602  Take care of parent ACL inheritance.
3603 ****************************************************************************/
3604
3605 NTSTATUS append_parent_acl(files_struct *fsp,
3606                                 const struct security_descriptor *pcsd,
3607                                 struct security_descriptor **pp_new_sd)
3608 {
3609         struct smb_filename *smb_dname = NULL;
3610         struct security_descriptor *parent_sd = NULL;
3611         files_struct *parent_fsp = NULL;
3612         TALLOC_CTX *mem_ctx = talloc_tos();
3613         char *parent_name = NULL;
3614         struct security_ace *new_ace = NULL;
3615         unsigned int num_aces = pcsd->dacl->num_aces;
3616         NTSTATUS status;
3617         int info;
3618         unsigned int i, j;
3619         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3620         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3621
3622         if (psd == NULL) {
3623                 return NT_STATUS_NO_MEMORY;
3624         }
3625
3626         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3627                             NULL)) {
3628                 return NT_STATUS_NO_MEMORY;
3629         }
3630
3631         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3632                                             &smb_dname);
3633         if (!NT_STATUS_IS_OK(status)) {
3634                 goto fail;
3635         }
3636
3637         status = SMB_VFS_CREATE_FILE(
3638                 fsp->conn,                              /* conn */
3639                 NULL,                                   /* req */
3640                 0,                                      /* root_dir_fid */
3641                 smb_dname,                              /* fname */
3642                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3643                 FILE_SHARE_NONE,                        /* share_access */
3644                 FILE_OPEN,                              /* create_disposition*/
3645                 FILE_DIRECTORY_FILE,                    /* create_options */
3646                 0,                                      /* file_attributes */
3647                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3648                 0,                                      /* allocation_size */
3649                 NULL,                                   /* sd */
3650                 NULL,                                   /* ea_list */
3651                 &parent_fsp,                            /* result */
3652                 &info);                                 /* pinfo */
3653
3654         if (!NT_STATUS_IS_OK(status)) {
3655                 TALLOC_FREE(smb_dname);
3656                 return status;
3657         }
3658
3659         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3660                                     SECINFO_DACL, &parent_sd );
3661
3662         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3663         TALLOC_FREE(smb_dname);
3664
3665         if (!NT_STATUS_IS_OK(status)) {
3666                 return status;
3667         }
3668
3669         /*
3670          * Make room for potentially all the ACLs from
3671          * the parent. We used to add the ugw triple here,
3672          * as we knew we were dealing with POSIX ACLs.
3673          * We no longer need to do so as we can guarentee
3674          * that a default ACL from the parent directory will
3675          * be well formed for POSIX ACLs if it came from a
3676          * POSIX ACL source, and if we're not writing to a
3677          * POSIX ACL sink then we don't care if it's not well
3678          * formed. JRA.
3679          */
3680
3681         num_aces += parent_sd->dacl->num_aces;
3682
3683         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, struct security_ace,
3684                                         num_aces)) == NULL) {
3685                 return NT_STATUS_NO_MEMORY;
3686         }
3687
3688         /* Start by copying in all the given ACE entries. */
3689         for (i = 0; i < psd->dacl->num_aces; i++) {
3690                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3691         }
3692
3693         /*
3694          * Note that we're ignoring "inherit permissions" here
3695          * as that really only applies to newly created files. JRA.
3696          */
3697
3698         /* Finally append any inherited ACEs. */
3699         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3700                 struct security_ace *se = &parent_sd->dacl->aces[j];
3701
3702                 if (fsp->is_directory) {
3703                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3704                                 /* Doesn't apply to a directory - ignore. */
3705                                 DEBUG(10,("append_parent_acl: directory %s "
3706                                         "ignoring non container "
3707                                         "inherit flags %u on ACE with sid %s "
3708                                         "from parent %s\n",
3709                                         fsp_str_dbg(fsp),
3710                                         (unsigned int)se->flags,
3711                                         sid_string_dbg(&se->trustee),
3712                                         parent_name));
3713                                 continue;
3714                         }
3715                 } else {
3716                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3717                                 /* Doesn't apply to a file - ignore. */
3718                                 DEBUG(10,("append_parent_acl: file %s "
3719                                         "ignoring non object "
3720                                         "inherit flags %u on ACE with sid %s "
3721                                         "from parent %s\n",
3722                                         fsp_str_dbg(fsp),
3723                                         (unsigned int)se->flags,
3724                                         sid_string_dbg(&se->trustee),
3725                                         parent_name));
3726                                 continue;
3727                         }
3728                 }
3729
3730                 if (is_dacl_protected) {
3731                         /* If the DACL is protected it means we must
3732                          * not overwrite an existing ACE entry with the
3733                          * same SID. This is order N^2. Ouch :-(. JRA. */
3734                         unsigned int k;
3735                         for (k = 0; k < psd->dacl->num_aces; k++) {
3736                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3737                                                 &se->trustee)) {
3738                                         break;
3739                                 }
3740                         }
3741                         if (k < psd->dacl->num_aces) {
3742                                 /* SID matched. Ignore. */
3743                                 DEBUG(10,("append_parent_acl: path %s "
3744                                         "ignoring ACE with protected sid %s "
3745                                         "from parent %s\n",
3746                                         fsp_str_dbg(fsp),
3747                                         sid_string_dbg(&se->trustee),
3748                                         parent_name));
3749                                 continue;
3750                         }
3751                 }
3752
3753                 sec_ace_copy(&new_ace[i], se);
3754                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3755                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3756                 }
3757                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3758
3759                 if (fsp->is_directory) {
3760                         /*
3761                          * Strip off any inherit only. It's applied.
3762                          */
3763                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3764                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3765                                 /* No further inheritance. */
3766                                 new_ace[i].flags &=
3767                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3768                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3769                         }
3770                 } else {
3771                         /*
3772                          * Strip off any container or inherit
3773                          * flags, they can't apply to objects.
3774                          */
3775                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3776                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3777                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3778                 }
3779                 i++;
3780
3781                 DEBUG(10,("append_parent_acl: path %s "
3782                         "inheriting ACE with sid %s "
3783                         "from parent %s\n",
3784                         fsp_str_dbg(fsp),
3785                         sid_string_dbg(&se->trustee),
3786                         parent_name));
3787         }
3788
3789         psd->dacl->aces = new_ace;
3790         psd->dacl->num_aces = i;
3791         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3792                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
3793
3794         *pp_new_sd = psd;
3795         return status;
3796 }
3797 #endif
3798
3799 /****************************************************************************
3800  Reply to set a security descriptor on an fsp. security_info_sent is the
3801  description of the following NT ACL.
3802  This should be the only external function needed for the UNIX style set ACL.
3803  We make a copy of psd_orig as internal functions modify the elements inside
3804  it, even though it's a const pointer.
3805 ****************************************************************************/
3806
3807 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3808 {
3809         connection_struct *conn = fsp->conn;
3810         uid_t user = (uid_t)-1;
3811         gid_t grp = (gid_t)-1;
3812         struct dom_sid file_owner_sid;
3813         struct dom_sid file_grp_sid;
3814         canon_ace *file_ace_list = NULL;
3815         canon_ace *dir_ace_list = NULL;
3816         bool acl_perms = False;
3817         mode_t orig_mode = (mode_t)0;
3818         NTSTATUS status;
3819         bool set_acl_as_root = false;
3820         bool acl_set_support = false;
3821         bool ret = false;
3822         struct security_descriptor *psd = NULL;
3823
3824         DEBUG(10,("set_nt_acl: called for file %s\n",
3825                   fsp_str_dbg(fsp)));
3826
3827         if (!CAN_WRITE(conn)) {
3828                 DEBUG(10,("set acl rejected on read-only share\n"));
3829                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3830         }
3831
3832         if (!psd_orig) {
3833                 return NT_STATUS_INVALID_PARAMETER;
3834         }
3835
3836         psd = dup_sec_desc(talloc_tos(), psd_orig);
3837         if (!psd) {
3838                 return NT_STATUS_NO_MEMORY;
3839         }
3840
3841         /*
3842          * Get the current state of the file.
3843          */
3844
3845         status = vfs_stat_fsp(fsp);
3846         if (!NT_STATUS_IS_OK(status)) {
3847                 return status;
3848         }
3849
3850         /* Save the original element we check against. */
3851         orig_mode = fsp->fsp_name->st.st_ex_mode;
3852
3853         /*
3854          * Unpack the user/group/world id's.
3855          */
3856
3857         /* POSIX can't cope with missing owner/group. */
3858         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3859                 security_info_sent &= ~SECINFO_OWNER;
3860         }
3861         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3862                 security_info_sent &= ~SECINFO_GROUP;
3863         }
3864
3865         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3866         if (!NT_STATUS_IS_OK(status)) {
3867                 return status;
3868         }
3869
3870         /*
3871          * Do we need to chown ? If so this must be done first as the incoming
3872          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3873          * Noticed by Simo.
3874          */
3875
3876         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3877             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3878
3879                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3880                          fsp_str_dbg(fsp), (unsigned int)user,
3881                          (unsigned int)grp));
3882
3883                 status = try_chown(fsp, user, grp);
3884                 if(!NT_STATUS_IS_OK(status)) {
3885                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3886                                 "= %s.\n", fsp_str_dbg(fsp),
3887                                 (unsigned int)user,
3888                                 (unsigned int)grp,
3889                                 nt_errstr(status)));
3890                         return status;
3891                 }
3892
3893                 /*
3894                  * Recheck the current state of the file, which may have changed.
3895                  * (suid/sgid bits, for instance)
3896                  */
3897
3898                 status = vfs_stat_fsp(fsp);
3899                 if (!NT_STATUS_IS_OK(status)) {
3900                         return status;
3901                 }
3902
3903                 /* Save the original element we check against. */
3904                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3905
3906                 /* If we successfully chowned, we know we must
3907                  * be able to set the acl, so do it as root.
3908                  */
3909                 set_acl_as_root = true;
3910         }
3911
3912         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3913
3914         if((security_info_sent & SECINFO_DACL) &&
3915                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3916                         (psd->dacl == NULL)) {
3917                 struct security_ace ace[3];
3918
3919                 /* We can't have NULL DACL in POSIX.
3920                    Use owner/group/Everyone -> full access. */
3921
3922                 init_sec_ace(&ace[0],
3923                                 &file_owner_sid,
3924                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3925                                 GENERIC_ALL_ACCESS,
3926                                 0);
3927                 init_sec_ace(&ace[1],
3928                                 &file_grp_sid,
3929                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3930                                 GENERIC_ALL_ACCESS,
3931                                 0);
3932                 init_sec_ace(&ace[2],
3933                                 &global_sid_World,
3934                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3935                                 GENERIC_ALL_ACCESS,
3936                                 0);
3937                 psd->dacl = make_sec_acl(talloc_tos(),
3938                                         NT4_ACL_REVISION,
3939                                         3,
3940                                         ace);
3941                 if (psd->dacl == NULL) {
3942                         return NT_STATUS_NO_MEMORY;
3943                 }
3944                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3945         }
3946
3947         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3948                                      &file_grp_sid, &file_ace_list,
3949                                      &dir_ace_list, security_info_sent, psd);
3950
3951         /* Ignore W2K traverse DACL set. */
3952         if (!file_ace_list && !dir_ace_list) {
3953                 return NT_STATUS_OK;
3954         }
3955
3956         if (!acl_perms) {
3957                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3958                 free_canon_ace_list(file_ace_list);
3959                 free_canon_ace_list(dir_ace_list);
3960                 return NT_STATUS_ACCESS_DENIED;
3961         }
3962
3963         /*
3964          * Only change security if we got a DACL.
3965          */
3966
3967         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3968                 free_canon_ace_list(file_ace_list);
3969                 free_canon_ace_list(dir_ace_list);
3970                 return NT_STATUS_OK;
3971         }
3972
3973         /*
3974          * Try using the POSIX ACL set first. Fall back to chmod if
3975          * we have no ACL support on this filesystem.
3976          */
3977
3978         if (acl_perms && file_ace_list) {
3979                 if (set_acl_as_root) {
3980                         become_root();
3981                 }
3982                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3983                                          &fsp->fsp_name->st, &acl_set_support);
3984                 if (set_acl_as_root) {
3985                         unbecome_root();
3986                 }
3987                 if (acl_set_support && ret == false) {
3988                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3989                                  "%s (%s).\n", fsp_str_dbg(fsp),
3990                                  strerror(errno)));
3991                         free_canon_ace_list(file_ace_list);
3992                         free_canon_ace_list(dir_ace_list);
3993                         return map_nt_error_from_unix(errno);
3994                 }
3995         }
3996
3997         if (acl_perms && acl_set_support && fsp->is_directory) {
3998                 if (dir_ace_list) {
3999                         if (set_acl_as_root) {
4000                                 become_root();
4001                         }
4002                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
4003                                                  &fsp->fsp_name->st,
4004                                                  &acl_set_support);
4005                         if (set_acl_as_root) {
4006                                 unbecome_root();
4007                         }
4008                         if (ret == false) {
4009                                 DEBUG(3,("set_nt_acl: failed to set default "
4010                                          "acl on directory %s (%s).\n",
4011                                          fsp_str_dbg(fsp), strerror(errno)));
4012                                 free_canon_ace_list(file_ace_list);
4013                                 free_canon_ace_list(dir_ace_list);
4014                                 return map_nt_error_from_unix(errno);
4015                         }
4016                 } else {
4017                         int sret = -1;
4018
4019                         /*
4020                          * No default ACL - delete one if it exists.
4021                          */
4022
4023                         if (set_acl_as_root) {
4024                                 become_root();
4025                         }
4026                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4027                             fsp->fsp_name->base_name);
4028                         if (set_acl_as_root) {
4029                                 unbecome_root();
4030                         }
4031                         if (sret == -1) {
4032                                 if (acl_group_override(conn, fsp->fsp_name)) {
4033                                         DEBUG(5,("set_nt_acl: acl group "
4034                                                  "control on and current user "
4035                                                  "in file %s primary group. "
4036                                                  "Override delete_def_acl\n",
4037                                                  fsp_str_dbg(fsp)));
4038
4039                                         become_root();
4040                                         sret =
4041                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4042                                                     conn,
4043                                                     fsp->fsp_name->base_name);
4044                                         unbecome_root();
4045                                 }
4046
4047                                 if (sret == -1) {
4048                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4049                                         free_canon_ace_list(file_ace_list);
4050                                         free_canon_ace_list(dir_ace_list);
4051                                         return map_nt_error_from_unix(errno);
4052                                 }
4053                         }
4054                 }
4055         }
4056
4057         if (acl_set_support) {
4058                 if (set_acl_as_root) {
4059                         become_root();
4060                 }
4061                 store_inheritance_attributes(fsp,
4062                                 file_ace_list,
4063                                 dir_ace_list,
4064                                 psd->type);
4065                 if (set_acl_as_root) {
4066                         unbecome_root();
4067                 }
4068         }
4069
4070         /*
4071          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4072          */
4073
4074         if(!acl_set_support && acl_perms) {
4075                 mode_t posix_perms;
4076
4077                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4078                         free_canon_ace_list(file_ace_list);
4079                         free_canon_ace_list(dir_ace_list);
4080                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4081                                  "posix permissions for file %s.\n",
4082                                  fsp_str_dbg(fsp)));
4083                         return NT_STATUS_ACCESS_DENIED;
4084                 }
4085
4086                 if (orig_mode != posix_perms) {
4087                         int sret = -1;
4088
4089                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4090                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4091
4092                         if (set_acl_as_root) {
4093                                 become_root();
4094                         }
4095                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4096                                              posix_perms);
4097                         if (set_acl_as_root) {
4098                                 unbecome_root();
4099                         }
4100                         if(sret == -1) {
4101                                 if (acl_group_override(conn, fsp->fsp_name)) {
4102                                         DEBUG(5,("set_nt_acl: acl group "
4103                                                  "control on and current user "
4104                                                  "in file %s primary group. "
4105                                                  "Override chmod\n",
4106                                                  fsp_str_dbg(fsp)));
4107
4108                                         become_root();
4109                                         sret = SMB_VFS_CHMOD(conn,
4110                                             fsp->fsp_name->base_name,
4111                                             posix_perms);
4112                                         unbecome_root();
4113                                 }
4114
4115                                 if (sret == -1) {
4116                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4117                                                  "failed. Error = %s.\n",
4118                                                  fsp_str_dbg(fsp),
4119                                                  (unsigned int)posix_perms,
4120                                                  strerror(errno)));
4121                                         free_canon_ace_list(file_ace_list);
4122                                         free_canon_ace_list(dir_ace_list);
4123                                         return map_nt_error_from_unix(errno);
4124                                 }
4125                         }
4126                 }
4127         }
4128
4129         free_canon_ace_list(file_ace_list);
4130         free_canon_ace_list(dir_ace_list);
4131
4132         /* Ensure the stat struct in the fsp is correct. */
4133         status = vfs_stat_fsp(fsp);
4134
4135         return NT_STATUS_OK;
4136 }
4137
4138 /****************************************************************************
4139  Get the actual group bits stored on a file with an ACL. Has no effect if
4140  the file has no ACL. Needed in dosmode code where the stat() will return
4141  the mask bits, not the real group bits, for a file with an ACL.
4142 ****************************************************************************/
4143
4144 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4145 {
4146         int entry_id = SMB_ACL_FIRST_ENTRY;
4147         SMB_ACL_ENTRY_T entry;
4148         SMB_ACL_T posix_acl;
4149         int result = -1;
4150
4151         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4152         if (posix_acl == (SMB_ACL_T)NULL)
4153                 return -1;
4154
4155         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4156                 SMB_ACL_TAG_T tagtype;
4157                 SMB_ACL_PERMSET_T permset;
4158
4159                 entry_id = SMB_ACL_NEXT_ENTRY;
4160
4161                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4162                         break;
4163
4164                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4165                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4166                                 break;
4167                         } else {
4168                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4169                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4170                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4171                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4172                                 result = 0;
4173                                 break;
4174                         }
4175                 }
4176         }
4177         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4178         return result;
4179 }
4180
4181 /****************************************************************************
4182  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4183  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4184 ****************************************************************************/
4185
4186 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4187 {
4188         int entry_id = SMB_ACL_FIRST_ENTRY;
4189         SMB_ACL_ENTRY_T entry;
4190         int num_entries = 0;
4191
4192         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4193                 SMB_ACL_TAG_T tagtype;
4194                 SMB_ACL_PERMSET_T permset;
4195                 mode_t perms;
4196
4197                 entry_id = SMB_ACL_NEXT_ENTRY;
4198
4199                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4200                         return -1;
4201
4202                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4203                         return -1;
4204
4205                 num_entries++;
4206
4207                 switch(tagtype) {
4208                         case SMB_ACL_USER_OBJ:
4209                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4210                                 break;
4211                         case SMB_ACL_GROUP_OBJ:
4212                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4213                                 break;
4214                         case SMB_ACL_MASK:
4215                                 /*
4216                                  * FIXME: The ACL_MASK entry permissions should really be set to
4217                                  * the union of the permissions of all ACL_USER,
4218                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4219                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4220                                  */
4221                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4222                                 break;
4223                         case SMB_ACL_OTHER:
4224                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4225                                 break;
4226                         default:
4227                                 continue;
4228                 }
4229
4230                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4231                         return -1;
4232
4233                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4234                         return -1;
4235         }
4236
4237         /*
4238          * If this is a simple 3 element ACL or no elements then it's a standard
4239          * UNIX permission set. Just use chmod...
4240          */
4241
4242         if ((num_entries == 3) || (num_entries == 0))
4243                 return -1;
4244
4245         return 0;
4246 }
4247
4248 /****************************************************************************
4249  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4250  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4251  resulting ACL on TO.  Note that name is in UNIX character set.
4252 ****************************************************************************/
4253
4254 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4255 {
4256         SMB_ACL_T posix_acl = NULL;
4257         int ret = -1;
4258
4259         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4260                 return -1;
4261
4262         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4263                 goto done;
4264
4265         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4266
4267  done:
4268
4269         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4270         return ret;
4271 }
4272
4273 /****************************************************************************
4274  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4275  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4276  Note that name is in UNIX character set.
4277 ****************************************************************************/
4278
4279 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4280 {
4281         return copy_access_posix_acl(conn, name, name, mode);
4282 }
4283
4284 /****************************************************************************
4285  Check for an existing default POSIX ACL on a directory.
4286 ****************************************************************************/
4287
4288 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4289 {
4290         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4291         bool has_acl = False;
4292         SMB_ACL_ENTRY_T entry;
4293
4294         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4295                 has_acl = True;
4296         }
4297
4298         if (def_acl) {
4299                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4300         }
4301         return has_acl;
4302 }
4303
4304 /****************************************************************************
4305  If the parent directory has no default ACL but it does have an Access ACL,
4306  inherit this Access ACL to file name.
4307 ****************************************************************************/
4308
4309 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4310                        const char *name, mode_t mode)
4311 {
4312         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4313                 return 0;
4314
4315         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4316 }
4317
4318 /****************************************************************************
4319  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4320  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4321 ****************************************************************************/
4322
4323 int fchmod_acl(files_struct *fsp, mode_t mode)
4324 {
4325         connection_struct *conn = fsp->conn;
4326         SMB_ACL_T posix_acl = NULL;
4327         int ret = -1;
4328
4329         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4330                 return -1;
4331
4332         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4333                 goto done;
4334
4335         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4336
4337   done:
4338
4339         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4340         return ret;
4341 }
4342
4343 /****************************************************************************
4344  Map from wire type to permset.
4345 ****************************************************************************/
4346
4347 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4348 {
4349         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4350                 return False;
4351         }
4352
4353         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4354                 return False;
4355         }
4356
4357         if (wire_perm & SMB_POSIX_ACL_READ) {
4358                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4359                         return False;
4360                 }
4361         }
4362         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4363                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4364                         return False;
4365                 }
4366         }
4367         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4368                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4369                         return False;
4370                 }
4371         }
4372         return True;
4373 }
4374
4375 /****************************************************************************
4376  Map from wire type to tagtype.
4377 ****************************************************************************/
4378
4379 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4380 {
4381         switch (wire_tt) {
4382                 case SMB_POSIX_ACL_USER_OBJ:
4383                         *p_tt = SMB_ACL_USER_OBJ;
4384                         break;
4385                 case SMB_POSIX_ACL_USER:
4386                         *p_tt = SMB_ACL_USER;
4387                         break;
4388                 case SMB_POSIX_ACL_GROUP_OBJ:
4389                         *p_tt = SMB_ACL_GROUP_OBJ;
4390                         break;
4391                 case SMB_POSIX_ACL_GROUP:
4392                         *p_tt = SMB_ACL_GROUP;
4393                         break;
4394                 case SMB_POSIX_ACL_MASK:
4395                         *p_tt = SMB_ACL_MASK;
4396                         break;
4397                 case SMB_POSIX_ACL_OTHER:
4398                         *p_tt = SMB_ACL_OTHER;
4399                         break;
4400                 default:
4401                         return False;
4402         }
4403         return True;
4404 }
4405
4406 /****************************************************************************
4407  Create a new POSIX acl from wire permissions.
4408  FIXME ! How does the share mask/mode fit into this.... ?
4409 ****************************************************************************/
4410
4411 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4412 {
4413         unsigned int i;
4414         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4415
4416         if (the_acl == NULL) {
4417                 return NULL;
4418         }
4419
4420         for (i = 0; i < num_acls; i++) {
4421                 SMB_ACL_ENTRY_T the_entry;
4422                 SMB_ACL_PERMSET_T the_permset;
4423                 SMB_ACL_TAG_T tag_type;
4424
4425                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4426                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4427                                 i, strerror(errno) ));
4428                         goto fail;
4429                 }
4430
4431                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4432                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4433                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4434                         goto fail;
4435                 }
4436
4437                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4438                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4439                                 i, strerror(errno) ));
4440                         goto fail;
4441                 }
4442
4443                 /* Get the permset pointer from the new ACL entry. */
4444                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4445                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4446                                 i, strerror(errno) ));
4447                         goto fail;
4448                 }
4449
4450                 /* Map from wire to permissions. */
4451                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4452                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4453                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4454                         goto fail;
4455                 }
4456
4457                 /* Now apply to the new ACL entry. */
4458                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4459                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4460                                 i, strerror(errno) ));
4461                         goto fail;
4462                 }
4463
4464                 if (tag_type == SMB_ACL_USER) {
4465                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4466                         uid_t uid = (uid_t)uidval;
4467                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4468                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4469                                         (unsigned int)uid, i, strerror(errno) ));
4470                                 goto fail;
4471                         }
4472                 }
4473
4474                 if (tag_type == SMB_ACL_GROUP) {
4475                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4476                         gid_t gid = (uid_t)gidval;
4477                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4478                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4479                                         (unsigned int)gid, i, strerror(errno) ));
4480                                 goto fail;
4481                         }
4482                 }
4483         }
4484
4485         return the_acl;
4486
4487  fail:
4488
4489         if (the_acl != NULL) {
4490                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4491         }
4492         return NULL;
4493 }
4494
4495 /****************************************************************************
4496  Calls from UNIX extensions - Default POSIX ACL set.
4497  If num_def_acls == 0 and not a directory just return. If it is a directory
4498  and num_def_acls == 0 then remove the default acl. Else set the default acl
4499  on the directory.
4500 ****************************************************************************/
4501
4502 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4503                                 uint16 num_def_acls, const char *pdata)
4504 {
4505         SMB_ACL_T def_acl = NULL;
4506
4507         if (!S_ISDIR(psbuf->st_ex_mode)) {
4508                 if (num_def_acls) {
4509                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4510                         errno = EISDIR;
4511                         return False;
4512                 } else {
4513                         return True;
4514                 }
4515         }
4516
4517         if (!num_def_acls) {
4518                 /* Remove the default ACL. */
4519                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4520                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4521                                 fname, strerror(errno) ));
4522                         return False;
4523                 }
4524                 return True;
4525         }
4526
4527         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4528                 return False;
4529         }
4530
4531         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4532                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4533                         fname, strerror(errno) ));
4534                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4535                 return False;
4536         }
4537
4538         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4539         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4540         return True;
4541 }
4542
4543 /****************************************************************************
4544  Remove an ACL from a file. As we don't have acl_delete_entry() available
4545  we must read the current acl and copy all entries except MASK, USER and GROUP
4546  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4547  removed.
4548  FIXME ! How does the share mask/mode fit into this.... ?
4549 ****************************************************************************/
4550
4551 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4552 {
4553         SMB_ACL_T file_acl = NULL;
4554         int entry_id = SMB_ACL_FIRST_ENTRY;
4555         SMB_ACL_ENTRY_T entry;
4556         bool ret = False;
4557         /* Create a new ACL with only 3 entries, u/g/w. */
4558         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4559         SMB_ACL_ENTRY_T user_ent = NULL;
4560         SMB_ACL_ENTRY_T group_ent = NULL;
4561         SMB_ACL_ENTRY_T other_ent = NULL;
4562
4563         if (new_file_acl == NULL) {
4564                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4565                 return False;
4566         }
4567
4568         /* Now create the u/g/w entries. */
4569         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4570                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4571                         fname, strerror(errno) ));
4572                 goto done;
4573         }
4574         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4575                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4576                         fname, strerror(errno) ));
4577                 goto done;
4578         }
4579
4580         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4581                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4582                         fname, strerror(errno) ));
4583                 goto done;
4584         }
4585         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4586                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4587                         fname, strerror(errno) ));
4588                 goto done;
4589         }
4590
4591         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4592                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4593                         fname, strerror(errno) ));
4594                 goto done;
4595         }
4596         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4597                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4598                         fname, strerror(errno) ));
4599                 goto done;
4600         }
4601
4602         /* Get the current file ACL. */
4603         if (fsp && fsp->fh->fd != -1) {
4604                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4605         } else {
4606                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4607         }
4608
4609         if (file_acl == NULL) {
4610                 /* This is only returned if an error occurred. Even for a file with
4611                    no acl a u/g/w acl should be returned. */
4612                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4613                         fname, strerror(errno) ));
4614                 goto done;
4615         }
4616
4617         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4618                 SMB_ACL_TAG_T tagtype;
4619                 SMB_ACL_PERMSET_T permset;
4620
4621                 entry_id = SMB_ACL_NEXT_ENTRY;
4622
4623                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4624                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4625                                 fname, strerror(errno) ));
4626                         goto done;
4627                 }
4628
4629                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4630                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4631                                 fname, strerror(errno) ));
4632                         goto done;
4633                 }
4634
4635                 if (tagtype == SMB_ACL_USER_OBJ) {
4636                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4637                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4638                                         fname, strerror(errno) ));
4639                         }
4640                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4641                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4642                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4643                                         fname, strerror(errno) ));
4644                         }
4645                 } else if (tagtype == SMB_ACL_OTHER) {
4646                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4647                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4648                                         fname, strerror(errno) ));
4649                         }
4650                 }
4651         }
4652
4653         /* Set the new empty file ACL. */
4654         if (fsp && fsp->fh->fd != -1) {
4655                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4656                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4657                                 fname, strerror(errno) ));
4658                         goto done;
4659                 }
4660         } else {
4661                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4662                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4663                                 fname, strerror(errno) ));
4664                         goto done;
4665                 }
4666         }
4667
4668         ret = True;
4669
4670  done:
4671
4672         if (file_acl) {
4673                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4674         }
4675         if (new_file_acl) {
4676                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4677         }
4678         return ret;
4679 }
4680
4681 /****************************************************************************
4682  Calls from UNIX extensions - POSIX ACL set.
4683  If num_def_acls == 0 then read/modify/write acl after removing all entries
4684  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4685 ****************************************************************************/
4686
4687 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4688 {
4689         SMB_ACL_T file_acl = NULL;
4690
4691         if (!num_acls) {
4692                 /* Remove the ACL from the file. */
4693                 return remove_posix_acl(conn, fsp, fname);
4694         }
4695
4696         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4697                 return False;
4698         }
4699
4700         if (fsp && fsp->fh->fd != -1) {
4701                 /* The preferred way - use an open fd. */
4702                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4703                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4704                                 fname, strerror(errno) ));
4705                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4706                         return False;
4707                 }
4708         } else {
4709                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4710                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4711                                 fname, strerror(errno) ));
4712                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4713                         return False;
4714                 }
4715         }
4716
4717         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4718         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4719         return True;
4720 }
4721
4722 /********************************************************************
4723  Pull the NT ACL from a file on disk or the OpenEventlog() access
4724  check.  Caller is responsible for freeing the returned security
4725  descriptor via TALLOC_FREE().  This is designed for dealing with
4726  user space access checks in smbd outside of the VFS.  For example,
4727  checking access rights in OpenEventlog().
4728
4729  Assume we are dealing with files (for now)
4730 ********************************************************************/
4731
4732 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4733 {
4734         struct security_descriptor *psd, *ret_sd;
4735         connection_struct *conn;
4736         files_struct finfo;
4737         struct fd_handle fh;
4738         NTSTATUS status;
4739
4740         conn = TALLOC_ZERO_P(ctx, connection_struct);
4741         if (conn == NULL) {
4742                 DEBUG(0, ("talloc failed\n"));
4743                 return NULL;
4744         }
4745
4746         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4747                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4748                 TALLOC_FREE(conn);
4749                 return NULL;
4750         }
4751
4752         conn->params->service = -1;
4753
4754         set_conn_connectpath(conn, "/");
4755
4756         if (!smbd_vfs_init(conn)) {
4757                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4758                 conn_free(conn);
4759                 return NULL;
4760         }
4761
4762         ZERO_STRUCT( finfo );
4763         ZERO_STRUCT( fh );
4764
4765         finfo.fnum = -1;
4766         finfo.conn = conn;
4767         finfo.fh = &fh;
4768         finfo.fh->fd = -1;
4769
4770         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4771                                             &finfo.fsp_name);
4772         if (!NT_STATUS_IS_OK(status)) {
4773                 conn_free(conn);
4774                 return NULL;
4775         }
4776
4777         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4778                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4779                 TALLOC_FREE(finfo.fsp_name);
4780                 conn_free(conn);
4781                 return NULL;
4782         }
4783
4784         ret_sd = dup_sec_desc( ctx, psd );
4785
4786         TALLOC_FREE(finfo.fsp_name);
4787         conn_free(conn);
4788
4789         return ret_sd;
4790 }
4791
4792 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4793
4794 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4795                                         const char *name,
4796                                         SMB_STRUCT_STAT *psbuf,
4797                                         struct security_descriptor **ppdesc)
4798 {
4799         struct dom_sid owner_sid, group_sid;
4800         size_t size = 0;
4801         struct security_ace aces[4];
4802         uint32_t access_mask = 0;
4803         mode_t mode = psbuf->st_ex_mode;
4804         struct security_acl *new_dacl = NULL;
4805         int idx = 0;
4806
4807         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4808                 name, (int)mode ));
4809
4810         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4811         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4812
4813         /*
4814          We provide up to 4 ACEs
4815                 - Owner
4816                 - Group
4817                 - Everyone
4818                 - NT System
4819         */
4820
4821         if (mode & S_IRUSR) {
4822                 if (mode & S_IWUSR) {
4823                         access_mask |= SEC_RIGHTS_FILE_ALL;
4824                 } else {
4825                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4826                 }
4827         }
4828         if (mode & S_IWUSR) {
4829                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4830         }
4831
4832         init_sec_ace(&aces[idx],
4833                         &owner_sid,
4834                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4835                         access_mask,
4836                         0);
4837         idx++;
4838
4839         access_mask = 0;
4840         if (mode & S_IRGRP) {
4841                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4842         }
4843         if (mode & S_IWGRP) {
4844                 /* note that delete is not granted - this matches posix behaviour */
4845                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4846         }
4847         if (access_mask) {
4848                 init_sec_ace(&aces[idx],
4849                         &group_sid,
4850                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4851                         access_mask,
4852                         0);
4853                 idx++;
4854         }
4855
4856         access_mask = 0;
4857         if (mode & S_IROTH) {
4858                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4859         }
4860         if (mode & S_IWOTH) {
4861                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4862         }
4863         if (access_mask) {
4864                 init_sec_ace(&aces[idx],
4865                         &global_sid_World,
4866                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4867                         access_mask,
4868                         0);
4869                 idx++;
4870         }
4871
4872         init_sec_ace(&aces[idx],
4873                         &global_sid_System,
4874                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4875                         SEC_RIGHTS_FILE_ALL,
4876                         0);
4877         idx++;
4878
4879         new_dacl = make_sec_acl(ctx,
4880                         NT4_ACL_REVISION,
4881                         idx,
4882                         aces);
4883
4884         if (!new_dacl) {
4885                 return NT_STATUS_NO_MEMORY;
4886         }
4887
4888         *ppdesc = make_sec_desc(ctx,
4889                         SECURITY_DESCRIPTOR_REVISION_1,
4890                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4891                         &owner_sid,
4892                         &group_sid,
4893                         NULL,
4894                         new_dacl,
4895                         &size);
4896         if (!*ppdesc) {
4897                 return NT_STATUS_NO_MEMORY;
4898         }
4899         return NT_STATUS_OK;
4900 }