source3/smbd/posix_acls.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB NT Security Descriptor / Unix permission conversion.
   4    Copyright (C) Jeremy Allison 1994-2009.
   5    Copyright (C) Andreas Gruenbacher 2002.
   6    Copyright (C) Simo Sorce <idra@samba.org> 2009.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23
  24 extern struct current_user current_user;
  25 extern const struct generic_mapping file_generic_mapping;
  26
  27 #undef  DBGC_CLASS
  28 #define DBGC_CLASS DBGC_ACLS
  29
  30 /****************************************************************************
  31  Data structures representing the internal ACE format.
  32 ****************************************************************************/
  33
  34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  36
  37 typedef union posix_id {
  38                 uid_t uid;
  39                 gid_t gid;
  40                 int world;
  41 } posix_id;
  42
  43 typedef struct canon_ace {
  44         struct canon_ace *next, *prev;
  45         SMB_ACL_TAG_T type;
  46         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  47         DOM_SID trustee;
  48         enum ace_owner owner_type;
  49         enum ace_attribute attr;
  50         posix_id unix_ug;
  51         uint8_t ace_flags; /* From windows ACE entry. */
  52 } canon_ace;
  53
  54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  55
  56 /*
  57  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  58  * attribute on disk - version 1.
  59  * All values are little endian.
  60  *
  61  * |  1   |  1   |   2         |         2           |  ....
  62  * +------+------+-------------+---------------------+-------------+--------------------+
  63  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  64  * +------+------+-------------+---------------------+-------------+--------------------+
  65  *
  66  * Entry format is :
  67  *
  68  * |  1   |       4           |
  69  * +------+-------------------+
  70  * | value|  uid/gid or world |
  71  * | type |  value            |
  72  * +------+-------------------+
  73  *
  74  * Version 2 format. Stores extra Windows metadata about an ACL.
  75  *
  76  * |  1   |  2       |   2         |         2           |  ....
  77  * +------+----------+-------------+---------------------+-------------+--------------------+
  78  * | vers | ace      | num_entries | num_default_entries | ..entries.. | default_entries... |
  79  * |   2  |  type    |             |                     |             |                    |
  80  * +------+----------+-------------+---------------------+-------------+--------------------+
  81  *
  82  * Entry format is :
  83  *
  84  * |  1   |  1   |       4           |
  85  * +------+------+-------------------+
  86  * | ace  | value|  uid/gid or world |
  87  * | flag | type |  value            |
  88  * +------+-------------------+------+
  89  *
  90  */
  91
  92 #define PAI_VERSION_OFFSET                      0
  93
  94 #define PAI_V1_FLAG_OFFSET                      1
  95 #define PAI_V1_NUM_ENTRIES_OFFSET               2
  96 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET       4
  97 #define PAI_V1_ENTRIES_BASE                     6
  98 #define PAI_V1_ACL_FLAG_PROTECTED               0x1
  99 #define PAI_V1_ENTRY_LENGTH                     5
 100
 101 #define PAI_V1_VERSION                          1
 102
 103 #define PAI_V2_TYPE_OFFSET                      1
 104 #define PAI_V2_NUM_ENTRIES_OFFSET               3
 105 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET       5
 106 #define PAI_V2_ENTRIES_BASE                     7
 107 #define PAI_V2_ENTRY_LENGTH                     6
 108
 109 #define PAI_V2_VERSION                          2
 110
 111 /*
 112  * In memory format of user.SAMBA_PAI attribute.
 113  */
 114
 115 struct pai_entry {
 116         struct pai_entry *next, *prev;
 117         uint8_t ace_flags;
 118         enum ace_owner owner_type;
 119         posix_id unix_ug;
 120 };
 121
 122 struct pai_val {
 123         uint16_t sd_type;
 124         unsigned int num_entries;
 125         struct pai_entry *entry_list;
 126         unsigned int num_def_entries;
 127         struct pai_entry *def_entry_list;
 128 };
 129
 130 /************************************************************************
 131  Return a uint32 of the pai_entry principal.
 132 ************************************************************************/
 133
 134 static uint32_t get_pai_entry_val(struct pai_entry *paie)
 135 {
 136         switch (paie->owner_type) {
 137                 case UID_ACE:
 138                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 139                         return (uint32_t)paie->unix_ug.uid;
 140                 case GID_ACE:
 141                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 142                         return (uint32_t)paie->unix_ug.gid;
 143                 case WORLD_ACE:
 144                 default:
 145                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 146                         return (uint32_t)-1;
 147         }
 148 }
 149
 150 /************************************************************************
 151  Return a uint32 of the entry principal.
 152 ************************************************************************/
 153
 154 static uint32_t get_entry_val(canon_ace *ace_entry)
 155 {
 156         switch (ace_entry->owner_type) {
 157                 case UID_ACE:
 158                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
 159                         return (uint32_t)ace_entry->unix_ug.uid;
 160                 case GID_ACE:
 161                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
 162                         return (uint32_t)ace_entry->unix_ug.gid;
 163                 case WORLD_ACE:
 164                 default:
 165                         DEBUG(10,("get_entry_val: world ace\n"));
 166                         return (uint32_t)-1;
 167         }
 168 }
 169
 170 /************************************************************************
 171  Create the on-disk format (always v2 now). Caller must free.
 172 ************************************************************************/
 173
 174 static char *create_pai_buf_v2(canon_ace *file_ace_list,
 175                                 canon_ace *dir_ace_list,
 176                                 uint16_t sd_type,
 177                                 size_t *store_size)
 178 {
 179         char *pai_buf = NULL;
 180         canon_ace *ace_list = NULL;
 181         char *entry_offset = NULL;
 182         unsigned int num_entries = 0;
 183         unsigned int num_def_entries = 0;
 184         unsigned int i;
 185
 186         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 187                 num_entries++;
 188         }
 189
 190         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 191                 num_def_entries++;
 192         }
 193
 194         DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 195
 196         *store_size = PAI_V2_ENTRIES_BASE +
 197                 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
 198
 199         pai_buf = (char *)SMB_MALLOC(*store_size);
 200         if (!pai_buf) {
 201                 return NULL;
 202         }
 203
 204         /* Set up the header. */
 205         memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
 206         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
 207         SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
 208         SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
 209         SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 210
 211         DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
 212                         (unsigned int)sd_type ));
 213
 214         entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
 215
 216         i = 0;
 217         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 218                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 219                 uint32_t entry_val = get_entry_val(ace_list);
 220
 221                 SCVAL(entry_offset,0,ace_list->ace_flags);
 222                 SCVAL(entry_offset,1,type_val);
 223                 SIVAL(entry_offset,2,entry_val);
 224                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 225                         i,
 226                         (unsigned int)ace_list->ace_flags,
 227                         (unsigned int)type_val,
 228                         (unsigned int)entry_val ));
 229                 i++;
 230                 entry_offset += PAI_V2_ENTRY_LENGTH;
 231         }
 232
 233         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 234                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 235                 uint32_t entry_val = get_entry_val(ace_list);
 236
 237                 SCVAL(entry_offset,0,ace_list->ace_flags);
 238                 SCVAL(entry_offset,1,type_val);
 239                 SIVAL(entry_offset,2,entry_val);
 240                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 241                         i,
 242                         (unsigned int)ace_list->ace_flags,
 243                         (unsigned int)type_val,
 244                         (unsigned int)entry_val ));
 245                 i++;
 246                 entry_offset += PAI_V2_ENTRY_LENGTH;
 247         }
 248
 249         return pai_buf;
 250 }
 251
 252 /************************************************************************
 253  Store the user.SAMBA_PAI attribute on disk.
 254 ************************************************************************/
 255
 256 static void store_inheritance_attributes(files_struct *fsp,
 257                                         canon_ace *file_ace_list,
 258                                         canon_ace *dir_ace_list,
 259                                         uint16_t sd_type)
 260 {
 261         int ret;
 262         size_t store_size;
 263         char *pai_buf;
 264
 265         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 266                 return;
 267         }
 268
 269         pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
 270                                 sd_type, &store_size);
 271
 272         if (fsp->fh->fd != -1) {
 273                 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 274                                 pai_buf, store_size, 0);
 275         } else {
 276                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
 277                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 278                                        pai_buf, store_size, 0);
 279         }
 280
 281         SAFE_FREE(pai_buf);
 282
 283         DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
 284                 (unsigned int)sd_type,
 285                 fsp_str_dbg(fsp)));
 286
 287         if (ret == -1 && !no_acl_syscall_error(errno)) {
 288                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 289         }
 290 }
 291
 292 /************************************************************************
 293  Delete the in memory inheritance info.
 294 ************************************************************************/
 295
 296 static void free_inherited_info(struct pai_val *pal)
 297 {
 298         if (pal) {
 299                 struct pai_entry *paie, *paie_next;
 300                 for (paie = pal->entry_list; paie; paie = paie_next) {
 301                         paie_next = paie->next;
 302                         SAFE_FREE(paie);
 303                 }
 304                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 305                         paie_next = paie->next;
 306                         SAFE_FREE(paie);
 307                 }
 308                 SAFE_FREE(pal);
 309         }
 310 }
 311
 312 /************************************************************************
 313  Get any stored ACE flags.
 314 ************************************************************************/
 315
 316 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
 317 {
 318         struct pai_entry *paie;
 319
 320         if (!pal) {
 321                 return 0;
 322         }
 323
 324         /* If the entry exists it is inherited. */
 325         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 326                 if (ace_entry->owner_type == paie->owner_type &&
 327                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 328                         return paie->ace_flags;
 329         }
 330         return 0;
 331 }
 332
 333 /************************************************************************
 334  Ensure an attribute just read is valid - v1.
 335 ************************************************************************/
 336
 337 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
 338 {
 339         uint16 num_entries;
 340         uint16 num_def_entries;
 341
 342         if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
 343                 /* Corrupted - too small. */
 344                 return false;
 345         }
 346
 347         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
 348                 return false;
 349         }
 350
 351         num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
 352         num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 353
 354         /* Check the entry lists match. */
 355         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 356
 357         if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
 358                         PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
 359                 return false;
 360         }
 361
 362         return true;
 363 }
 364
 365 /************************************************************************
 366  Ensure an attribute just read is valid - v2.
 367 ************************************************************************/
 368
 369 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
 370 {
 371         uint16 num_entries;
 372         uint16 num_def_entries;
 373
 374         if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
 375                 /* Corrupted - too small. */
 376                 return false;
 377         }
 378
 379         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
 380                 return false;
 381         }
 382
 383         num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
 384         num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 385
 386         /* Check the entry lists match. */
 387         /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
 388
 389         if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
 390                         PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
 391                 return false;
 392         }
 393
 394         return true;
 395 }
 396
 397 /************************************************************************
 398  Decode the owner.
 399 ************************************************************************/
 400
 401 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
 402 {
 403         paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 404         switch( paie->owner_type) {
 405                 case UID_ACE:
 406                         paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 407                         DEBUG(10,("get_pai_owner_type: uid = %u\n",
 408                                 (unsigned int)paie->unix_ug.uid ));
 409                         break;
 410                 case GID_ACE:
 411                         paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 412                         DEBUG(10,("get_pai_owner_type: gid = %u\n",
 413                                 (unsigned int)paie->unix_ug.gid ));
 414                         break;
 415                 case WORLD_ACE:
 416                         paie->unix_ug.world = -1;
 417                         DEBUG(10,("get_pai_owner_type: world ace\n"));
 418                         break;
 419                 default:
 420                         DEBUG(10,("get_pai_owner_type: unknown type %u\n",
 421                                 (unsigned int)paie->owner_type ));
 422                         return false;
 423         }
 424         return true;
 425 }
 426
 427 /************************************************************************
 428  Process v2 entries.
 429 ************************************************************************/
 430
 431 static const char *create_pai_v1_entries(struct pai_val *paiv,
 432                                 const char *entry_offset,
 433                                 bool def_entry)
 434 {
 435         int i;
 436
 437         for (i = 0; i < paiv->num_entries; i++) {
 438                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 439                 if (!paie) {
 440                         return NULL;
 441                 }
 442
 443                 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
 444                 if (!get_pai_owner_type(paie, entry_offset)) {
 445                         return NULL;
 446                 }
 447
 448                 if (!def_entry) {
 449                         DLIST_ADD(paiv->entry_list, paie);
 450                 } else {
 451                         DLIST_ADD(paiv->def_entry_list, paie);
 452                 }
 453                 entry_offset += PAI_V1_ENTRY_LENGTH;
 454         }
 455         return entry_offset;
 456 }
 457
 458 /************************************************************************
 459  Convert to in-memory format from version 1.
 460 ************************************************************************/
 461
 462 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
 463 {
 464         const char *entry_offset;
 465         struct pai_val *paiv = NULL;
 466
 467         if (!check_pai_ok_v1(buf, size)) {
 468                 return NULL;
 469         }
 470
 471         paiv = SMB_MALLOC_P(struct pai_val);
 472         if (!paiv) {
 473                 return NULL;
 474         }
 475
 476         memset(paiv, '\0', sizeof(struct pai_val));
 477
 478         paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
 479                         SE_DESC_DACL_PROTECTED : 0;
 480
 481         paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
 482         paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 483
 484         entry_offset = buf + PAI_V1_ENTRIES_BASE;
 485
 486         DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
 487                         paiv->num_entries, paiv->num_def_entries ));
 488
 489         entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
 490         if (entry_offset == NULL) {
 491                 free_inherited_info(paiv);
 492                 return NULL;
 493         }
 494         entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
 495         if (entry_offset == NULL) {
 496                 free_inherited_info(paiv);
 497                 return NULL;
 498         }
 499
 500         return paiv;
 501 }
 502
 503 /************************************************************************
 504  Process v2 entries.
 505 ************************************************************************/
 506
 507 static const char *create_pai_v2_entries(struct pai_val *paiv,
 508                                 unsigned int num_entries,
 509                                 const char *entry_offset,
 510                                 bool def_entry)
 511 {
 512         unsigned int i;
 513
 514         for (i = 0; i < num_entries; i++) {
 515                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 516                 if (!paie) {
 517                         return NULL;
 518                 }
 519
 520                 paie->ace_flags = CVAL(entry_offset,0);
 521
 522                 if (!get_pai_owner_type(paie, entry_offset+1)) {
 523                         return NULL;
 524                 }
 525                 if (!def_entry) {
 526                         DLIST_ADD(paiv->entry_list, paie);
 527                 } else {
 528                         DLIST_ADD(paiv->def_entry_list, paie);
 529                 }
 530                 entry_offset += PAI_V2_ENTRY_LENGTH;
 531         }
 532         return entry_offset;
 533 }
 534
 535 /************************************************************************
 536  Convert to in-memory format from version 2.
 537 ************************************************************************/
 538
 539 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
 540 {
 541         const char *entry_offset;
 542         struct pai_val *paiv = NULL;
 543
 544         if (!check_pai_ok_v2(buf, size)) {
 545                 return NULL;
 546         }
 547
 548         paiv = SMB_MALLOC_P(struct pai_val);
 549         if (!paiv) {
 550                 return NULL;
 551         }
 552
 553         memset(paiv, '\0', sizeof(struct pai_val));
 554
 555         paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
 556
 557         paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
 558         paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 559
 560         entry_offset = buf + PAI_V2_ENTRIES_BASE;
 561
 562         DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
 563                         (unsigned int)paiv->sd_type,
 564                         paiv->num_entries, paiv->num_def_entries ));
 565
 566         entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
 567                                 entry_offset, false);
 568         if (entry_offset == NULL) {
 569                 free_inherited_info(paiv);
 570                 return NULL;
 571         }
 572         entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
 573                                 entry_offset, true);
 574         if (entry_offset == NULL) {
 575                 free_inherited_info(paiv);
 576                 return NULL;
 577         }
 578
 579         return paiv;
 580 }
 581
 582 /************************************************************************
 583  Convert to in-memory format - from either version 1 or 2.
 584 ************************************************************************/
 585
 586 static struct pai_val *create_pai_val(const char *buf, size_t size)
 587 {
 588         if (size < 1) {
 589                 return NULL;
 590         }
 591         if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
 592                 return create_pai_val_v1(buf, size);
 593         } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
 594                 return create_pai_val_v2(buf, size);
 595         } else {
 596                 return NULL;
 597         }
 598 }
 599
 600 /************************************************************************
 601  Load the user.SAMBA_PAI attribute.
 602 ************************************************************************/
 603
 604 static struct pai_val *fload_inherited_info(files_struct *fsp)
 605 {
 606         char *pai_buf;
 607         size_t pai_buf_size = 1024;
 608         struct pai_val *paiv = NULL;
 609         ssize_t ret;
 610
 611         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 612                 return NULL;
 613         }
 614
 615         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 616                 return NULL;
 617         }
 618
 619         do {
 620                 if (fsp->fh->fd != -1) {
 621                         ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 622                                         pai_buf, pai_buf_size);
 623                 } else {
 624                         ret = SMB_VFS_GETXATTR(fsp->conn,
 625                                                fsp->fsp_name->base_name,
 626                                                SAMBA_POSIX_INHERITANCE_EA_NAME,
 627                                                pai_buf, pai_buf_size);
 628                 }
 629
 630                 if (ret == -1) {
 631                         if (errno != ERANGE) {
 632                                 break;
 633                         }
 634                         /* Buffer too small - enlarge it. */
 635                         pai_buf_size *= 2;
 636                         SAFE_FREE(pai_buf);
 637                         if (pai_buf_size > 1024*1024) {
 638                                 return NULL; /* Limit malloc to 1mb. */
 639                         }
 640                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 641                                 return NULL;
 642                 }
 643         } while (ret == -1);
 644
 645         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
 646                   (unsigned long)ret, fsp_str_dbg(fsp)));
 647
 648         if (ret == -1) {
 649                 /* No attribute or not supported. */
 650 #if defined(ENOATTR)
 651                 if (errno != ENOATTR)
 652                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 653 #else
 654                 if (errno != ENOSYS)
 655                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 656 #endif
 657                 SAFE_FREE(pai_buf);
 658                 return NULL;
 659         }
 660
 661         paiv = create_pai_val(pai_buf, ret);
 662
 663         if (paiv) {
 664                 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
 665                           (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
 666         }
 667
 668         SAFE_FREE(pai_buf);
 669         return paiv;
 670 }
 671
 672 /************************************************************************
 673  Load the user.SAMBA_PAI attribute.
 674 ************************************************************************/
 675
 676 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
 677                                            const char *fname)
 678 {
 679         char *pai_buf;
 680         size_t pai_buf_size = 1024;
 681         struct pai_val *paiv = NULL;
 682         ssize_t ret;
 683
 684         if (!lp_map_acl_inherit(SNUM(conn))) {
 685                 return NULL;
 686         }
 687
 688         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 689                 return NULL;
 690         }
 691
 692         do {
 693                 ret = SMB_VFS_GETXATTR(conn, fname,
 694                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 695                                        pai_buf, pai_buf_size);
 696
 697                 if (ret == -1) {
 698                         if (errno != ERANGE) {
 699                                 break;
 700                         }
 701                         /* Buffer too small - enlarge it. */
 702                         pai_buf_size *= 2;
 703                         SAFE_FREE(pai_buf);
 704                         if (pai_buf_size > 1024*1024) {
 705                                 return NULL; /* Limit malloc to 1mb. */
 706                         }
 707                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 708                                 return NULL;
 709                 }
 710         } while (ret == -1);
 711
 712         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
 713
 714         if (ret == -1) {
 715                 /* No attribute or not supported. */
 716 #if defined(ENOATTR)
 717                 if (errno != ENOATTR)
 718                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 719 #else
 720                 if (errno != ENOSYS)
 721                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 722 #endif
 723                 SAFE_FREE(pai_buf);
 724                 return NULL;
 725         }
 726
 727         paiv = create_pai_val(pai_buf, ret);
 728
 729         if (paiv) {
 730                 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
 731                         (unsigned int)paiv->sd_type,
 732                         fname));
 733         }
 734
 735         SAFE_FREE(pai_buf);
 736         return paiv;
 737 }
 738
 739 /****************************************************************************
 740  Functions to manipulate the internal ACE format.
 741 ****************************************************************************/
 742
 743 /****************************************************************************
 744  Count a linked list of canonical ACE entries.
 745 ****************************************************************************/
 746
 747 static size_t count_canon_ace_list( canon_ace *l_head )
 748 {
 749         size_t count = 0;
 750         canon_ace *ace;
 751
 752         for (ace = l_head; ace; ace = ace->next)
 753                 count++;
 754
 755         return count;
 756 }
 757
 758 /****************************************************************************
 759  Free a linked list of canonical ACE entries.
 760 ****************************************************************************/
 761
 762 static void free_canon_ace_list( canon_ace *l_head )
 763 {
 764         canon_ace *list, *next;
 765
 766         for (list = l_head; list; list = next) {
 767                 next = list->next;
 768                 DLIST_REMOVE(l_head, list);
 769                 SAFE_FREE(list);
 770         }
 771 }
 772
 773 /****************************************************************************
 774  Function to duplicate a canon_ace entry.
 775 ****************************************************************************/
 776
 777 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 778 {
 779         canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
 780
 781         if (dst_ace == NULL)
 782                 return NULL;
 783
 784         *dst_ace = *src_ace;
 785         dst_ace->prev = dst_ace->next = NULL;
 786         return dst_ace;
 787 }
 788
 789 /****************************************************************************
 790  Print out a canon ace.
 791 ****************************************************************************/
 792
 793 static void print_canon_ace(canon_ace *pace, int num)
 794 {
 795         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 796         dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
 797         if (pace->owner_type == UID_ACE) {
 798                 const char *u_name = uidtoname(pace->unix_ug.uid);
 799                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
 800         } else if (pace->owner_type == GID_ACE) {
 801                 char *g_name = gidtoname(pace->unix_ug.gid);
 802                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
 803         } else
 804                 dbgtext( "other ");
 805         switch (pace->type) {
 806                 case SMB_ACL_USER:
 807                         dbgtext( "SMB_ACL_USER ");
 808                         break;
 809                 case SMB_ACL_USER_OBJ:
 810                         dbgtext( "SMB_ACL_USER_OBJ ");
 811                         break;
 812                 case SMB_ACL_GROUP:
 813                         dbgtext( "SMB_ACL_GROUP ");
 814                         break;
 815                 case SMB_ACL_GROUP_OBJ:
 816                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 817                         break;
 818                 case SMB_ACL_OTHER:
 819                         dbgtext( "SMB_ACL_OTHER ");
 820                         break;
 821                 default:
 822                         dbgtext( "MASK " );
 823                         break;
 824         }
 825
 826         dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
 827         dbgtext( "perms ");
 828         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 829         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 830         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 831 }
 832
 833 /****************************************************************************
 834  Print out a canon ace list.
 835 ****************************************************************************/
 836
 837 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 838 {
 839         int count = 0;
 840
 841         if( DEBUGLVL( 10 )) {
 842                 dbgtext( "print_canon_ace_list: %s\n", name );
 843                 for (;ace_list; ace_list = ace_list->next, count++)
 844                         print_canon_ace(ace_list, count );
 845         }
 846 }
 847
 848 /****************************************************************************
 849  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 850 ****************************************************************************/
 851
 852 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
 853 {
 854         mode_t ret = 0;
 855
 856         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
 857         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 858         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 859
 860         return ret;
 861 }
 862
 863 /****************************************************************************
 864  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 865 ****************************************************************************/
 866
 867 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 868 {
 869         mode_t ret = 0;
 870
 871         if (mode & r_mask)
 872                 ret |= S_IRUSR;
 873         if (mode & w_mask)
 874                 ret |= S_IWUSR;
 875         if (mode & x_mask)
 876                 ret |= S_IXUSR;
 877
 878         return ret;
 879 }
 880
 881 /****************************************************************************
 882  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 883  an SMB_ACL_PERMSET_T.
 884 ****************************************************************************/
 885
 886 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 887 {
 888         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1)
 889                 return -1;
 890         if (mode & S_IRUSR) {
 891                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
 892                         return -1;
 893         }
 894         if (mode & S_IWUSR) {
 895                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
 896                         return -1;
 897         }
 898         if (mode & S_IXUSR) {
 899                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
 900                         return -1;
 901         }
 902         return 0;
 903 }
 904
 905 /****************************************************************************
 906  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 907 ****************************************************************************/
 908
 909 void create_file_sids(const SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
 910 {
 911         uid_to_sid( powner_sid, psbuf->st_ex_uid );
 912         gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
 913 }
 914
 915 /****************************************************************************
 916  Merge aces with a common sid - if both are allow or deny, OR the permissions together and
 917  delete the second one. If the first is deny, mask the permissions off and delete the allow
 918  if the permissions become zero, delete the deny if the permissions are non zero.
 919 ****************************************************************************/
 920
 921 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
 922 {
 923         canon_ace *l_head = *pp_list_head;
 924         canon_ace *curr_ace_outer;
 925         canon_ace *curr_ace_outer_next;
 926
 927         /*
 928          * First, merge allow entries with identical SIDs, and deny entries
 929          * with identical SIDs.
 930          */
 931
 932         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 933                 canon_ace *curr_ace;
 934                 canon_ace *curr_ace_next;
 935
 936                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 937
 938                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 939                         bool can_merge = false;
 940
 941                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 942
 943                         /* For file ACLs we can merge if the SIDs and ALLOW/DENY
 944                          * types are the same. For directory acls we must also
 945                          * ensure the POSIX ACL types are the same. */
 946
 947                         if (!dir_acl) {
 948                                 can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 949                                                 (curr_ace->attr == curr_ace_outer->attr));
 950                         } else {
 951                                 can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 952                                                 (curr_ace->type == curr_ace_outer->type) &&
 953                                                 (curr_ace->attr == curr_ace_outer->attr));
 954                         }
 955
 956                         if (can_merge) {
 957                                 if( DEBUGLVL( 10 )) {
 958                                         dbgtext("merge_aces: Merging ACE's\n");
 959                                         print_canon_ace( curr_ace_outer, 0);
 960                                         print_canon_ace( curr_ace, 0);
 961                                 }
 962
 963                                 /* Merge two allow or two deny ACE's. */
 964
 965                                 /* Theoretically we shouldn't merge a dir ACE if
 966                                  * one ACE has the CI flag set, and the other
 967                                  * ACE has the OI flag set, but this is rare
 968                                  * enough we can ignore it. */
 969
 970                                 curr_ace_outer->perms |= curr_ace->perms;
 971                                 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
 972                                 DLIST_REMOVE(l_head, curr_ace);
 973                                 SAFE_FREE(curr_ace);
 974                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 975                         }
 976                 }
 977         }
 978
 979         /*
 980          * Now go through and mask off allow permissions with deny permissions.
 981          * We can delete either the allow or deny here as we know that each SID
 982          * appears only once in the list.
 983          */
 984
 985         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 986                 canon_ace *curr_ace;
 987                 canon_ace *curr_ace_next;
 988
 989                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 990
 991                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 992
 993                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 994
 995                         /*
 996                          * Subtract ACE's with different entries. Due to the ordering constraints
 997                          * we've put on the ACL, we know the deny must be the first one.
 998                          */
 999
1000                         if (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1001                                 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1002
1003                                 if( DEBUGLVL( 10 )) {
1004                                         dbgtext("merge_aces: Masking ACE's\n");
1005                                         print_canon_ace( curr_ace_outer, 0);
1006                                         print_canon_ace( curr_ace, 0);
1007                                 }
1008
1009                                 curr_ace->perms &= ~curr_ace_outer->perms;
1010
1011                                 if (curr_ace->perms == 0) {
1012
1013                                         /*
1014                                          * The deny overrides the allow. Remove the allow.
1015                                          */
1016
1017                                         DLIST_REMOVE(l_head, curr_ace);
1018                                         SAFE_FREE(curr_ace);
1019                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1020
1021                                 } else {
1022
1023                                         /*
1024                                          * Even after removing permissions, there
1025                                          * are still allow permissions - delete the deny.
1026                                          * It is safe to delete the deny here,
1027                                          * as we are guarenteed by the deny first
1028                                          * ordering that all the deny entries for
1029                                          * this SID have already been merged into one
1030                                          * before we can get to an allow ace.
1031                                          */
1032
1033                                         DLIST_REMOVE(l_head, curr_ace_outer);
1034                                         SAFE_FREE(curr_ace_outer);
1035                                         break;
1036                                 }
1037                         }
1038
1039                 } /* end for curr_ace */
1040         } /* end for curr_ace_outer */
1041
1042         /* We may have modified the list. */
1043
1044         *pp_list_head = l_head;
1045 }
1046
1047 /****************************************************************************
1048  Check if we need to return NT4.x compatible ACL entries.
1049 ****************************************************************************/
1050
1051 bool nt4_compatible_acls(void)
1052 {
1053         int compat = lp_acl_compatibility();
1054
1055         if (compat == ACL_COMPAT_AUTO) {
1056                 enum remote_arch_types ra_type = get_remote_arch();
1057
1058                 /* Automatically adapt to client */
1059                 return (ra_type <= RA_WINNT);
1060         } else
1061                 return (compat == ACL_COMPAT_WINNT);
1062 }
1063
1064
1065 /****************************************************************************
1066  Map canon_ace perms to permission bits NT.
1067  The attr element is not used here - we only process deny entries on set,
1068  not get. Deny entries are implicit on get with ace->perms = 0.
1069 ****************************************************************************/
1070
1071 uint32_t map_canon_ace_perms(int snum,
1072                                 enum security_ace_type *pacl_type,
1073                                 mode_t perms,
1074                                 bool directory_ace)
1075 {
1076         uint32_t nt_mask = 0;
1077
1078         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1079
1080         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1081                 if (directory_ace) {
1082                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1083                 } else {
1084                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1085                 }
1086         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1087                 /*
1088                  * Windows NT refuses to display ACEs with no permissions in them (but
1089                  * they are perfectly legal with Windows 2000). If the ACE has empty
1090                  * permissions we cannot use 0, so we use the otherwise unused
1091                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1092                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1093                  * to be changed in the future.
1094                  */
1095
1096                 if (nt4_compatible_acls())
1097                         nt_mask = UNIX_ACCESS_NONE;
1098                 else
1099                         nt_mask = 0;
1100         } else {
1101                 if (directory_ace) {
1102                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1103                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1104                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1105                 } else {
1106                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1107                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1108                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1109                 }
1110         }
1111
1112         if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1113                 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1114         }
1115
1116         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1117                         (unsigned int)perms, (unsigned int)nt_mask ));
1118
1119         return nt_mask;
1120 }
1121
1122 /****************************************************************************
1123  Map NT perms to a UNIX mode_t.
1124 ****************************************************************************/
1125
1126 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1127 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1128 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1129
1130 static mode_t map_nt_perms( uint32 *mask, int type)
1131 {
1132         mode_t mode = 0;
1133
1134         switch(type) {
1135         case S_IRUSR:
1136                 if((*mask) & GENERIC_ALL_ACCESS)
1137                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1138                 else {
1139                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1140                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1141                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1142                 }
1143                 break;
1144         case S_IRGRP:
1145                 if((*mask) & GENERIC_ALL_ACCESS)
1146                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1147                 else {
1148                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1149                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1150                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1151                 }
1152                 break;
1153         case S_IROTH:
1154                 if((*mask) & GENERIC_ALL_ACCESS)
1155                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1156                 else {
1157                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1158                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1159                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1160                 }
1161                 break;
1162         }
1163
1164         return mode;
1165 }
1166
1167 /****************************************************************************
1168  Unpack a SEC_DESC into a UNIX owner and group.
1169 ****************************************************************************/
1170
1171 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd)
1172 {
1173         DOM_SID owner_sid;
1174         DOM_SID grp_sid;
1175
1176         *puser = (uid_t)-1;
1177         *pgrp = (gid_t)-1;
1178
1179         if(security_info_sent == 0) {
1180                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1181                 return NT_STATUS_OK;
1182         }
1183
1184         /*
1185          * Validate the owner and group SID's.
1186          */
1187
1188         memset(&owner_sid, '\0', sizeof(owner_sid));
1189         memset(&grp_sid, '\0', sizeof(grp_sid));
1190
1191         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1192
1193         /*
1194          * Don't immediately fail if the owner sid cannot be validated.
1195          * This may be a group chown only set.
1196          */
1197
1198         if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1199                 sid_copy(&owner_sid, psd->owner_sid);
1200                 if (!sid_to_uid(&owner_sid, puser)) {
1201                         if (lp_force_unknown_acl_user(snum)) {
1202                                 /* this allows take ownership to work
1203                                  * reasonably */
1204                                 *puser = current_user.ut.uid;
1205                         } else {
1206                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1207                                          " owner sid for %s\n",
1208                                          sid_string_dbg(&owner_sid)));
1209                                 return NT_STATUS_INVALID_OWNER;
1210                         }
1211                 }
1212                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1213                          (unsigned int)*puser ));
1214         }
1215
1216         /*
1217          * Don't immediately fail if the group sid cannot be validated.
1218          * This may be an owner chown only set.
1219          */
1220
1221         if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1222                 sid_copy(&grp_sid, psd->group_sid);
1223                 if (!sid_to_gid( &grp_sid, pgrp)) {
1224                         if (lp_force_unknown_acl_user(snum)) {
1225                                 /* this allows take group ownership to work
1226                                  * reasonably */
1227                                 *pgrp = current_user.ut.gid;
1228                         } else {
1229                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1230                                          " group sid.\n"));
1231                                 return NT_STATUS_INVALID_OWNER;
1232                         }
1233                 }
1234                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1235                          (unsigned int)*pgrp));
1236         }
1237
1238         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1239
1240         return NT_STATUS_OK;
1241 }
1242
1243 /****************************************************************************
1244  Ensure the enforced permissions for this share apply.
1245 ****************************************************************************/
1246
1247 static void apply_default_perms(const struct share_params *params,
1248                                 const bool is_directory, canon_ace *pace,
1249                                 mode_t type)
1250 {
1251         mode_t and_bits = (mode_t)0;
1252         mode_t or_bits = (mode_t)0;
1253
1254         /* Get the initial bits to apply. */
1255
1256         if (is_directory) {
1257                 and_bits = lp_dir_security_mask(params->service);
1258                 or_bits = lp_force_dir_security_mode(params->service);
1259         } else {
1260                 and_bits = lp_security_mask(params->service);
1261                 or_bits = lp_force_security_mode(params->service);
1262         }
1263
1264         /* Now bounce them into the S_USR space. */
1265         switch(type) {
1266         case S_IRUSR:
1267                 /* Ensure owner has read access. */
1268                 pace->perms |= S_IRUSR;
1269                 if (is_directory)
1270                         pace->perms |= (S_IWUSR|S_IXUSR);
1271                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1272                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1273                 break;
1274         case S_IRGRP:
1275                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1276                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1277                 break;
1278         case S_IROTH:
1279                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1280                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1281                 break;
1282         }
1283
1284         pace->perms = ((pace->perms & and_bits)|or_bits);
1285 }
1286
1287 /****************************************************************************
1288  Check if a given uid/SID is in a group gid/SID. This is probably very
1289  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1290 ****************************************************************************/
1291
1292 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1293 {
1294         const char *u_name = NULL;
1295
1296         /* "Everyone" always matches every uid. */
1297
1298         if (sid_equal(&group_ace->trustee, &global_sid_World))
1299                 return True;
1300
1301         /*
1302          * if it's the current user, we already have the unix token
1303          * and don't need to do the complex user_in_group_sid() call
1304          */
1305         if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1306                 size_t i;
1307
1308                 if (group_ace->unix_ug.gid == current_user.ut.gid) {
1309                         return True;
1310                 }
1311
1312                 for (i=0; i < current_user.ut.ngroups; i++) {
1313                         if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1314                                 return True;
1315                         }
1316                 }
1317         }
1318
1319         /* u_name talloc'ed off tos. */
1320         u_name = uidtoname(uid_ace->unix_ug.uid);
1321         if (!u_name) {
1322                 return False;
1323         }
1324
1325         /*
1326          * user_in_group_sid() uses create_token_from_username()
1327          * which creates an artificial NT token given just a username,
1328          * so this is not reliable for users from foreign domains
1329          * exported by winbindd!
1330          */
1331         return user_in_group_sid(u_name, &group_ace->trustee);
1332 }
1333
1334 /****************************************************************************
1335  A well formed POSIX file or default ACL has at least 3 entries, a
1336  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1337  In addition, the owner must always have at least read access.
1338  When using this call on get_acl, the pst struct is valid and contains
1339  the mode of the file. When using this call on set_acl, the pst struct has
1340  been modified to have a mode containing the default for this file or directory
1341  type.
1342 ****************************************************************************/
1343
1344 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1345                                 const struct share_params *params,
1346                                 const bool is_directory,
1347                                 const DOM_SID *pfile_owner_sid,
1348                                 const DOM_SID *pfile_grp_sid,
1349                                 const SMB_STRUCT_STAT *pst,
1350                                 bool setting_acl)
1351 {
1352         canon_ace *pace;
1353         bool got_user = False;
1354         bool got_grp = False;
1355         bool got_other = False;
1356         canon_ace *pace_other = NULL;
1357
1358         for (pace = *pp_ace; pace; pace = pace->next) {
1359                 if (pace->type == SMB_ACL_USER_OBJ) {
1360
1361                         if (setting_acl)
1362                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1363                         got_user = True;
1364
1365                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1366
1367                         /*
1368                          * Ensure create mask/force create mode is respected on set.
1369                          */
1370
1371                         if (setting_acl)
1372                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1373                         got_grp = True;
1374
1375                 } else if (pace->type == SMB_ACL_OTHER) {
1376
1377                         /*
1378                          * Ensure create mask/force create mode is respected on set.
1379                          */
1380
1381                         if (setting_acl)
1382                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1383                         got_other = True;
1384                         pace_other = pace;
1385                 }
1386         }
1387
1388         if (!got_user) {
1389                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1390                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1391                         return False;
1392                 }
1393
1394                 ZERO_STRUCTP(pace);
1395                 pace->type = SMB_ACL_USER_OBJ;
1396                 pace->owner_type = UID_ACE;
1397                 pace->unix_ug.uid = pst->st_ex_uid;
1398                 pace->trustee = *pfile_owner_sid;
1399                 pace->attr = ALLOW_ACE;
1400                 /* Start with existing permissions, principle of least
1401                    surprises for the user. */
1402                 pace->perms = pst->st_ex_mode;
1403
1404                 if (setting_acl) {
1405                         /* See if the owning user is in any of the other groups in
1406                            the ACE, or if there's a matching user entry.
1407                            If so, OR in the permissions from that entry. */
1408
1409                         canon_ace *pace_iter;
1410
1411                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1412                                 if (pace_iter->type == SMB_ACL_USER &&
1413                                                 pace_iter->unix_ug.uid == pace->unix_ug.uid) {
1414                                         pace->perms |= pace_iter->perms;
1415                                 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1416                                         if (uid_entry_in_group(pace, pace_iter)) {
1417                                                 pace->perms |= pace_iter->perms;
1418                                         }
1419                                 }
1420                         }
1421
1422                         if (pace->perms == 0) {
1423                                 /* If we only got an "everyone" perm, just use that. */
1424                                 if (got_other)
1425                                         pace->perms = pace_other->perms;
1426                         }
1427
1428                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1429                 } else {
1430                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1431                 }
1432
1433                 DLIST_ADD(*pp_ace, pace);
1434         }
1435
1436         if (!got_grp) {
1437                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1438                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1439                         return False;
1440                 }
1441
1442                 ZERO_STRUCTP(pace);
1443                 pace->type = SMB_ACL_GROUP_OBJ;
1444                 pace->owner_type = GID_ACE;
1445                 pace->unix_ug.uid = pst->st_ex_gid;
1446                 pace->trustee = *pfile_grp_sid;
1447                 pace->attr = ALLOW_ACE;
1448                 if (setting_acl) {
1449                         /* If we only got an "everyone" perm, just use that. */
1450                         if (got_other)
1451                                 pace->perms = pace_other->perms;
1452                         else
1453                                 pace->perms = 0;
1454                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1455                 } else {
1456                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1457                 }
1458
1459                 DLIST_ADD(*pp_ace, pace);
1460         }
1461
1462         if (!got_other) {
1463                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1464                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1465                         return False;
1466                 }
1467
1468                 ZERO_STRUCTP(pace);
1469                 pace->type = SMB_ACL_OTHER;
1470                 pace->owner_type = WORLD_ACE;
1471                 pace->unix_ug.world = -1;
1472                 pace->trustee = global_sid_World;
1473                 pace->attr = ALLOW_ACE;
1474                 if (setting_acl) {
1475                         pace->perms = 0;
1476                         apply_default_perms(params, is_directory, pace, S_IROTH);
1477                 } else
1478                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1479
1480                 DLIST_ADD(*pp_ace, pace);
1481         }
1482
1483         return True;
1484 }
1485
1486 /****************************************************************************
1487  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1488  If it does not have them, check if there are any entries where the trustee is the
1489  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1490  Note we must not do this to default directory ACLs.
1491 ****************************************************************************/
1492
1493 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1494 {
1495         bool got_user_obj, got_group_obj;
1496         canon_ace *current_ace;
1497         int i, entries;
1498
1499         entries = count_canon_ace_list(ace);
1500         got_user_obj = False;
1501         got_group_obj = False;
1502
1503         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1504                 if (current_ace->type == SMB_ACL_USER_OBJ)
1505                         got_user_obj = True;
1506                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1507                         got_group_obj = True;
1508         }
1509         if (got_user_obj && got_group_obj) {
1510                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1511                 return;
1512         }
1513
1514         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1515                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1516                                 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1517                         current_ace->type = SMB_ACL_USER_OBJ;
1518                         got_user_obj = True;
1519                 }
1520                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1521                                 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1522                         current_ace->type = SMB_ACL_GROUP_OBJ;
1523                         got_group_obj = True;
1524                 }
1525         }
1526         if (!got_user_obj)
1527                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1528         if (!got_group_obj)
1529                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1530 }
1531
1532 /****************************************************************************
1533  Unpack a SEC_DESC into two canonical ace lists.
1534 ****************************************************************************/
1535
1536 static bool create_canon_ace_lists(files_struct *fsp,
1537                                         const SMB_STRUCT_STAT *pst,
1538                                         DOM_SID *pfile_owner_sid,
1539                                         DOM_SID *pfile_grp_sid,
1540                                         canon_ace **ppfile_ace,
1541                                         canon_ace **ppdir_ace,
1542                                         const SEC_ACL *dacl)
1543 {
1544         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1545         canon_ace *file_ace = NULL;
1546         canon_ace *dir_ace = NULL;
1547         canon_ace *current_ace = NULL;
1548         bool got_dir_allow = False;
1549         bool got_file_allow = False;
1550         int i, j;
1551
1552         *ppfile_ace = NULL;
1553         *ppdir_ace = NULL;
1554
1555         /*
1556          * Convert the incoming ACL into a more regular form.
1557          */
1558
1559         for(i = 0; i < dacl->num_aces; i++) {
1560                 SEC_ACE *psa = &dacl->aces[i];
1561
1562                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1563                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1564                         return False;
1565                 }
1566
1567                 if (nt4_compatible_acls()) {
1568                         /*
1569                          * The security mask may be UNIX_ACCESS_NONE which should map into
1570                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1571                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1572                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1573                          */
1574
1575                         /*
1576                          * Convert GENERIC bits to specific bits.
1577                          */
1578
1579                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1580
1581                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1582
1583                         if(psa->access_mask != UNIX_ACCESS_NONE)
1584                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1585                 }
1586         }
1587
1588         /*
1589          * Deal with the fact that NT 4.x re-writes the canonical format
1590          * that we return for default ACLs. If a directory ACE is identical
1591          * to a inherited directory ACE then NT changes the bits so that the
1592          * first ACE is set to OI|IO and the second ACE for this SID is set
1593          * to CI. We need to repair this. JRA.
1594          */
1595
1596         for(i = 0; i < dacl->num_aces; i++) {
1597                 SEC_ACE *psa1 = &dacl->aces[i];
1598
1599                 for (j = i + 1; j < dacl->num_aces; j++) {
1600                         SEC_ACE *psa2 = &dacl->aces[j];
1601
1602                         if (psa1->access_mask != psa2->access_mask)
1603                                 continue;
1604
1605                         if (!sid_equal(&psa1->trustee, &psa2->trustee))
1606                                 continue;
1607
1608                         /*
1609                          * Ok - permission bits and SIDs are equal.
1610                          * Check if flags were re-written.
1611                          */
1612
1613                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1614
1615                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1616                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1617
1618                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1619
1620                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1621                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1622
1623                         }
1624                 }
1625         }
1626
1627         for(i = 0; i < dacl->num_aces; i++) {
1628                 SEC_ACE *psa = &dacl->aces[i];
1629
1630                 /*
1631                  * Create a cannon_ace entry representing this NT DACL ACE.
1632                  */
1633
1634                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1635                         free_canon_ace_list(file_ace);
1636                         free_canon_ace_list(dir_ace);
1637                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1638                         return False;
1639                 }
1640
1641                 ZERO_STRUCTP(current_ace);
1642
1643                 sid_copy(&current_ace->trustee, &psa->trustee);
1644
1645                 /*
1646                  * Try and work out if the SID is a user or group
1647                  * as we need to flag these differently for POSIX.
1648                  * Note what kind of a POSIX ACL this should map to.
1649                  */
1650
1651                 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1652                         current_ace->owner_type = WORLD_ACE;
1653                         current_ace->unix_ug.world = -1;
1654                         current_ace->type = SMB_ACL_OTHER;
1655                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1656                         current_ace->owner_type = UID_ACE;
1657                         current_ace->unix_ug.uid = pst->st_ex_uid;
1658                         current_ace->type = SMB_ACL_USER_OBJ;
1659
1660                         /*
1661                          * The Creator Owner entry only specifies inheritable permissions,
1662                          * never access permissions. WinNT doesn't always set the ACE to
1663                          * INHERIT_ONLY, though.
1664                          */
1665
1666                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1667
1668                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1669                         current_ace->owner_type = GID_ACE;
1670                         current_ace->unix_ug.gid = pst->st_ex_gid;
1671                         current_ace->type = SMB_ACL_GROUP_OBJ;
1672
1673                         /*
1674                          * The Creator Group entry only specifies inheritable permissions,
1675                          * never access permissions. WinNT doesn't always set the ACE to
1676                          * INHERIT_ONLY, though.
1677                          */
1678                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1679
1680                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1681                         current_ace->owner_type = UID_ACE;
1682                         /* If it's the owning user, this is a user_obj, not
1683                          * a user. */
1684                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1685                                 current_ace->type = SMB_ACL_USER_OBJ;
1686                         } else {
1687                                 current_ace->type = SMB_ACL_USER;
1688                         }
1689                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1690                         current_ace->owner_type = GID_ACE;
1691                         /* If it's the primary group, this is a group_obj, not
1692                          * a group. */
1693                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1694                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1695                         } else {
1696                                 current_ace->type = SMB_ACL_GROUP;
1697                         }
1698                 } else {
1699                         /*
1700                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1701                          */
1702
1703                         if (non_mappable_sid(&psa->trustee)) {
1704                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1705                                            "non-mappable SID %s\n",
1706                                            sid_string_dbg(&psa->trustee)));
1707                                 SAFE_FREE(current_ace);
1708                                 continue;
1709                         }
1710
1711                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1712                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1713                                         "unknown or foreign SID %s\n",
1714                                         sid_string_dbg(&psa->trustee)));
1715                                         SAFE_FREE(current_ace);
1716                                 continue;
1717                         }
1718
1719                         free_canon_ace_list(file_ace);
1720                         free_canon_ace_list(dir_ace);
1721                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1722                                   "%s to uid or gid.\n",
1723                                   sid_string_dbg(&current_ace->trustee)));
1724                         SAFE_FREE(current_ace);
1725                         return False;
1726                 }
1727
1728                 /*
1729                  * Map the given NT permissions into a UNIX mode_t containing only
1730                  * S_I(R|W|X)USR bits.
1731                  */
1732
1733                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1734                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1735
1736                 /* Store the ace_flag. */
1737                 current_ace->ace_flags = psa->flags;
1738
1739                 /*
1740                  * Now add the created ace to either the file list, the directory
1741                  * list, or both. We *MUST* preserve the order here (hence we use
1742                  * DLIST_ADD_END) as NT ACLs are order dependent.
1743                  */
1744
1745                 if (fsp->is_directory) {
1746
1747                         /*
1748                          * We can only add to the default POSIX ACE list if the ACE is
1749                          * designed to be inherited by both files and directories.
1750                          */
1751
1752                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1753                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1754
1755                                 canon_ace *current_dir_ace = current_ace;
1756                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1757
1758                                 /*
1759                                  * Note if this was an allow ace. We can't process
1760                                  * any further deny ace's after this.
1761                                  */
1762
1763                                 if (current_ace->attr == ALLOW_ACE)
1764                                         got_dir_allow = True;
1765
1766                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1767                                         DEBUG(0,("create_canon_ace_lists: "
1768                                                  "malformed ACL in "
1769                                                  "inheritable ACL! Deny entry "
1770                                                  "after Allow entry. Failing "
1771                                                  "to set on file %s.\n",
1772                                                  fsp_str_dbg(fsp)));
1773                                         free_canon_ace_list(file_ace);
1774                                         free_canon_ace_list(dir_ace);
1775                                         return False;
1776                                 }
1777
1778                                 if( DEBUGLVL( 10 )) {
1779                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1780                                         print_canon_ace( current_ace, 0);
1781                                 }
1782
1783                                 /*
1784                                  * If this is not an inherit only ACE we need to add a duplicate
1785                                  * to the file acl.
1786                                  */
1787
1788                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1789                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1790
1791                                         if (!dup_ace) {
1792                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1793                                                 free_canon_ace_list(file_ace);
1794                                                 free_canon_ace_list(dir_ace);
1795                                                 return False;
1796                                         }
1797
1798                                         /*
1799                                          * We must not free current_ace here as its
1800                                          * pointer is now owned by the dir_ace list.
1801                                          */
1802                                         current_ace = dup_ace;
1803                                         /* We've essentially split this ace into two,
1804                                          * and added the ace with inheritance request
1805                                          * bits to the directory ACL. Drop those bits for
1806                                          * the ACE we're adding to the file list. */
1807                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1808                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1809                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1810                                 } else {
1811                                         /*
1812                                          * We must not free current_ace here as its
1813                                          * pointer is now owned by the dir_ace list.
1814                                          */
1815                                         current_ace = NULL;
1816                                 }
1817
1818                                 /*
1819                                  * current_ace is now either owned by file_ace
1820                                  * or is NULL. We can safely operate on current_dir_ace
1821                                  * to treat mapping for default acl entries differently
1822                                  * than access acl entries.
1823                                  */
1824
1825                                 if (current_dir_ace->owner_type == UID_ACE) {
1826                                         /*
1827                                          * We already decided above this is a uid,
1828                                          * for default acls ace's only CREATOR_OWNER
1829                                          * maps to ACL_USER_OBJ. All other uid
1830                                          * ace's are ACL_USER.
1831                                          */
1832                                         if (sid_equal(&current_dir_ace->trustee,
1833                                                         &global_sid_Creator_Owner)) {
1834                                                 current_dir_ace->type = SMB_ACL_USER_OBJ;
1835                                         } else {
1836                                                 current_dir_ace->type = SMB_ACL_USER;
1837                                         }
1838                                 }
1839
1840                                 if (current_dir_ace->owner_type == GID_ACE) {
1841                                         /*
1842                                          * We already decided above this is a gid,
1843                                          * for default acls ace's only CREATOR_GROUP
1844                                          * maps to ACL_GROUP_OBJ. All other uid
1845                                          * ace's are ACL_GROUP.
1846                                          */
1847                                         if (sid_equal(&current_dir_ace->trustee,
1848                                                         &global_sid_Creator_Group)) {
1849                                                 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1850                                         } else {
1851                                                 current_dir_ace->type = SMB_ACL_GROUP;
1852                                         }
1853                                 }
1854                         }
1855                 }
1856
1857                 /*
1858                  * Only add to the file ACL if not inherit only.
1859                  */
1860
1861                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1862                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1863
1864                         /*
1865                          * Note if this was an allow ace. We can't process
1866                          * any further deny ace's after this.
1867                          */
1868
1869                         if (current_ace->attr == ALLOW_ACE)
1870                                 got_file_allow = True;
1871
1872                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1873                                 DEBUG(0,("create_canon_ace_lists: malformed "
1874                                          "ACL in file ACL ! Deny entry after "
1875                                          "Allow entry. Failing to set on file "
1876                                          "%s.\n", fsp_str_dbg(fsp)));
1877                                 free_canon_ace_list(file_ace);
1878                                 free_canon_ace_list(dir_ace);
1879                                 return False;
1880                         }
1881
1882                         if( DEBUGLVL( 10 )) {
1883                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1884                                 print_canon_ace( current_ace, 0);
1885                         }
1886                         all_aces_are_inherit_only = False;
1887                         /*
1888                          * We must not free current_ace here as its
1889                          * pointer is now owned by the file_ace list.
1890                          */
1891                         current_ace = NULL;
1892                 }
1893
1894                 /*
1895                  * Free if ACE was not added.
1896                  */
1897
1898                 SAFE_FREE(current_ace);
1899         }
1900
1901         if (fsp->is_directory && all_aces_are_inherit_only) {
1902                 /*
1903                  * Windows 2000 is doing one of these weird 'inherit acl'
1904                  * traverses to conserve NTFS ACL resources. Just pretend
1905                  * there was no DACL sent. JRA.
1906                  */
1907
1908                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1909                 free_canon_ace_list(file_ace);
1910                 free_canon_ace_list(dir_ace);
1911                 file_ace = NULL;
1912                 dir_ace = NULL;
1913         } else {
1914                 /*
1915                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
1916                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1917                  * entries can be converted to *_OBJ. Don't do this for the default
1918                  * ACL, we will create them separately for this if needed inside
1919                  * ensure_canon_entry_valid().
1920                  */
1921                 if (file_ace) {
1922                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1923                 }
1924         }
1925
1926         *ppfile_ace = file_ace;
1927         *ppdir_ace = dir_ace;
1928
1929         return True;
1930 }
1931
1932 /****************************************************************************
1933  ASCII art time again... JRA :-).
1934
1935  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1936  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1937  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1938  allow or deny have been merged, so the same SID can only appear once in the deny
1939  list or once in the allow list.
1940
1941  We then process as follows :
1942
1943  ---------------------------------------------------------------------------
1944  First pass - look for a Everyone DENY entry.
1945
1946  If it is deny all (rwx) trunate the list at this point.
1947  Else, walk the list from this point and use the deny permissions of this
1948  entry as a mask on all following allow entries. Finally, delete
1949  the Everyone DENY entry (we have applied it to everything possible).
1950
1951  In addition, in this pass we remove any DENY entries that have
1952  no permissions (ie. they are a DENY nothing).
1953  ---------------------------------------------------------------------------
1954  Second pass - only deal with deny user entries.
1955
1956  DENY user1 (perms XXX)
1957
1958  new_perms = 0
1959  for all following allow group entries where user1 is in group
1960         new_perms |= group_perms;
1961
1962  user1 entry perms = new_perms & ~ XXX;
1963
1964  Convert the deny entry to an allow entry with the new perms and
1965  push to the end of the list. Note if the user was in no groups
1966  this maps to a specific allow nothing entry for this user.
1967
1968  The common case from the NT ACL choser (userX deny all) is
1969  optimised so we don't do the group lookup - we just map to
1970  an allow nothing entry.
1971
1972  What we're doing here is inferring the allow permissions the
1973  person setting the ACE on user1 wanted by looking at the allow
1974  permissions on the groups the user is currently in. This will
1975  be a snapshot, depending on group membership but is the best
1976  we can do and has the advantage of failing closed rather than
1977  open.
1978  ---------------------------------------------------------------------------
1979  Third pass - only deal with deny group entries.
1980
1981  DENY group1 (perms XXX)
1982
1983  for all following allow user entries where user is in group1
1984    user entry perms = user entry perms & ~ XXX;
1985
1986  If there is a group Everyone allow entry with permissions YYY,
1987  convert the group1 entry to an allow entry and modify its
1988  permissions to be :
1989
1990  new_perms = YYY & ~ XXX
1991
1992  and push to the end of the list.
1993
1994  If there is no group Everyone allow entry then convert the
1995  group1 entry to a allow nothing entry and push to the end of the list.
1996
1997  Note that the common case from the NT ACL choser (groupX deny all)
1998  cannot be optimised here as we need to modify user entries who are
1999  in the group to change them to a deny all also.
2000
2001  What we're doing here is modifying the allow permissions of
2002  user entries (which are more specific in POSIX ACLs) to mask
2003  out the explicit deny set on the group they are in. This will
2004  be a snapshot depending on current group membership but is the
2005  best we can do and has the advantage of failing closed rather
2006  than open.
2007  ---------------------------------------------------------------------------
2008  Fourth pass - cope with cumulative permissions.
2009
2010  for all allow user entries, if there exists an allow group entry with
2011  more permissive permissions, and the user is in that group, rewrite the
2012  allow user permissions to contain both sets of permissions.
2013
2014  Currently the code for this is #ifdef'ed out as these semantics make
2015  no sense to me. JRA.
2016  ---------------------------------------------------------------------------
2017
2018  Note we *MUST* do the deny user pass first as this will convert deny user
2019  entries into allow user entries which can then be processed by the deny
2020  group pass.
2021
2022  The above algorithm took a *lot* of thinking about - hence this
2023  explaination :-). JRA.
2024 ****************************************************************************/
2025
2026 /****************************************************************************
2027  Process a canon_ace list entries. This is very complex code. We need
2028  to go through and remove the "deny" permissions from any allow entry that matches
2029  the id of this entry. We have already refused any NT ACL that wasn't in correct
2030  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2031  we just remove it (to fail safe). We have already removed any duplicate ace
2032  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2033  allow entries.
2034 ****************************************************************************/
2035
2036 static void process_deny_list( canon_ace **pp_ace_list )
2037 {
2038         canon_ace *ace_list = *pp_ace_list;
2039         canon_ace *curr_ace = NULL;
2040         canon_ace *curr_ace_next = NULL;
2041
2042         /* Pass 1 above - look for an Everyone, deny entry. */
2043
2044         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2045                 canon_ace *allow_ace_p;
2046
2047                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2048
2049                 if (curr_ace->attr != DENY_ACE)
2050                         continue;
2051
2052                 if (curr_ace->perms == (mode_t)0) {
2053
2054                         /* Deny nothing entry - delete. */
2055
2056                         DLIST_REMOVE(ace_list, curr_ace);
2057                         continue;
2058                 }
2059
2060                 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2061                         continue;
2062
2063                 /* JRATEST - assert. */
2064                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2065
2066                 if (curr_ace->perms == ALL_ACE_PERMS) {
2067
2068                         /*
2069                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2070                          * list at this point including this entry.
2071                          */
2072
2073                         canon_ace *prev_entry = curr_ace->prev;
2074
2075                         free_canon_ace_list( curr_ace );
2076                         if (prev_entry)
2077                                 prev_entry->next = NULL;
2078                         else {
2079                                 /* We deleted the entire list. */
2080                                 ace_list = NULL;
2081                         }
2082                         break;
2083                 }
2084
2085                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2086
2087                         /*
2088                          * Only mask off allow entries.
2089                          */
2090
2091                         if (allow_ace_p->attr != ALLOW_ACE)
2092                                 continue;
2093
2094                         allow_ace_p->perms &= ~curr_ace->perms;
2095                 }
2096
2097                 /*
2098                  * Now it's been applied, remove it.
2099                  */
2100
2101                 DLIST_REMOVE(ace_list, curr_ace);
2102         }
2103
2104         /* Pass 2 above - deal with deny user entries. */
2105
2106         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2107                 mode_t new_perms = (mode_t)0;
2108                 canon_ace *allow_ace_p;
2109
2110                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2111
2112                 if (curr_ace->attr != DENY_ACE)
2113                         continue;
2114
2115                 if (curr_ace->owner_type != UID_ACE)
2116                         continue;
2117
2118                 if (curr_ace->perms == ALL_ACE_PERMS) {
2119
2120                         /*
2121                          * Optimisation - this is a deny everything to this user.
2122                          * Convert to an allow nothing and push to the end of the list.
2123                          */
2124
2125                         curr_ace->attr = ALLOW_ACE;
2126                         curr_ace->perms = (mode_t)0;
2127                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2128                         continue;
2129                 }
2130
2131                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2132
2133                         if (allow_ace_p->attr != ALLOW_ACE)
2134                                 continue;
2135
2136                         /* We process GID_ACE and WORLD_ACE entries only. */
2137
2138                         if (allow_ace_p->owner_type == UID_ACE)
2139                                 continue;
2140
2141                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2142                                 new_perms |= allow_ace_p->perms;
2143                 }
2144
2145                 /*
2146                  * Convert to a allow entry, modify the perms and push to the end
2147                  * of the list.
2148                  */
2149
2150                 curr_ace->attr = ALLOW_ACE;
2151                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2152                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2153         }
2154
2155         /* Pass 3 above - deal with deny group entries. */
2156
2157         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2158                 canon_ace *allow_ace_p;
2159                 canon_ace *allow_everyone_p = NULL;
2160
2161                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2162
2163                 if (curr_ace->attr != DENY_ACE)
2164                         continue;
2165
2166                 if (curr_ace->owner_type != GID_ACE)
2167                         continue;
2168
2169                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2170
2171                         if (allow_ace_p->attr != ALLOW_ACE)
2172                                 continue;
2173
2174                         /* Store a pointer to the Everyone allow, if it exists. */
2175                         if (allow_ace_p->owner_type == WORLD_ACE)
2176                                 allow_everyone_p = allow_ace_p;
2177
2178                         /* We process UID_ACE entries only. */
2179
2180                         if (allow_ace_p->owner_type != UID_ACE)
2181                                 continue;
2182
2183                         /* Mask off the deny group perms. */
2184
2185                         if (uid_entry_in_group( allow_ace_p, curr_ace))
2186                                 allow_ace_p->perms &= ~curr_ace->perms;
2187                 }
2188
2189                 /*
2190                  * Convert the deny to an allow with the correct perms and
2191                  * push to the end of the list.
2192                  */
2193
2194                 curr_ace->attr = ALLOW_ACE;
2195                 if (allow_everyone_p)
2196                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2197                 else
2198                         curr_ace->perms = (mode_t)0;
2199                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2200         }
2201
2202         /* Doing this fourth pass allows Windows semantics to be layered
2203          * on top of POSIX semantics. I'm not sure if this is desirable.
2204          * For example, in W2K ACLs there is no way to say, "Group X no
2205          * access, user Y full access" if user Y is a member of group X.
2206          * This seems completely broken semantics to me.... JRA.
2207          */
2208
2209 #if 0
2210         /* Pass 4 above - deal with allow entries. */
2211
2212         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2213                 canon_ace *allow_ace_p;
2214
2215                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2216
2217                 if (curr_ace->attr != ALLOW_ACE)
2218                         continue;
2219
2220                 if (curr_ace->owner_type != UID_ACE)
2221                         continue;
2222
2223                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2224
2225                         if (allow_ace_p->attr != ALLOW_ACE)
2226                                 continue;
2227
2228                         /* We process GID_ACE entries only. */
2229
2230                         if (allow_ace_p->owner_type != GID_ACE)
2231                                 continue;
2232
2233                         /* OR in the group perms. */
2234
2235                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2236                                 curr_ace->perms |= allow_ace_p->perms;
2237                 }
2238         }
2239 #endif
2240
2241         *pp_ace_list = ace_list;
2242 }
2243
2244 /****************************************************************************
2245  Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2246  succeeding.
2247 ****************************************************************************/
2248
2249 static bool unpack_canon_ace(files_struct *fsp,
2250                                 const SMB_STRUCT_STAT *pst,
2251                                 DOM_SID *pfile_owner_sid,
2252                                 DOM_SID *pfile_grp_sid,
2253                                 canon_ace **ppfile_ace,
2254                                 canon_ace **ppdir_ace,
2255                                 uint32 security_info_sent,
2256                                 const SEC_DESC *psd)
2257 {
2258         canon_ace *file_ace = NULL;
2259         canon_ace *dir_ace = NULL;
2260
2261         *ppfile_ace = NULL;
2262         *ppdir_ace = NULL;
2263
2264         if(security_info_sent == 0) {
2265                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2266                 return False;
2267         }
2268
2269         /*
2270          * If no DACL then this is a chown only security descriptor.
2271          */
2272
2273         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2274                 return True;
2275
2276         /*
2277          * Now go through the DACL and create the canon_ace lists.
2278          */
2279
2280         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2281                                                                 &file_ace, &dir_ace, psd->dacl))
2282                 return False;
2283
2284         if ((file_ace == NULL) && (dir_ace == NULL)) {
2285                 /* W2K traverse DACL set - ignore. */
2286                 return True;
2287         }
2288
2289         /*
2290          * Go through the canon_ace list and merge entries
2291          * belonging to identical users of identical allow or deny type.
2292          * We can do this as all deny entries come first, followed by
2293          * all allow entries (we have mandated this before accepting this acl).
2294          */
2295
2296         print_canon_ace_list( "file ace - before merge", file_ace);
2297         merge_aces( &file_ace, false);
2298
2299         print_canon_ace_list( "dir ace - before merge", dir_ace);
2300         merge_aces( &dir_ace, true);
2301
2302         /*
2303          * NT ACLs are order dependent. Go through the acl lists and
2304          * process DENY entries by masking the allow entries.
2305          */
2306
2307         print_canon_ace_list( "file ace - before deny", file_ace);
2308         process_deny_list( &file_ace);
2309
2310         print_canon_ace_list( "dir ace - before deny", dir_ace);
2311         process_deny_list( &dir_ace);
2312
2313         /*
2314          * A well formed POSIX file or default ACL has at least 3 entries, a
2315          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2316          * and optionally a mask entry. Ensure this is the case.
2317          */
2318
2319         print_canon_ace_list( "file ace - before valid", file_ace);
2320
2321         if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params,
2322                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2323                 free_canon_ace_list(file_ace);
2324                 free_canon_ace_list(dir_ace);
2325                 return False;
2326         }
2327
2328         print_canon_ace_list( "dir ace - before valid", dir_ace);
2329
2330         if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params,
2331                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2332                 free_canon_ace_list(file_ace);
2333                 free_canon_ace_list(dir_ace);
2334                 return False;
2335         }
2336
2337         print_canon_ace_list( "file ace - return", file_ace);
2338         print_canon_ace_list( "dir ace - return", dir_ace);
2339
2340         *ppfile_ace = file_ace;
2341         *ppdir_ace = dir_ace;
2342         return True;
2343
2344 }
2345
2346 /******************************************************************************
2347  When returning permissions, try and fit NT display
2348  semantics if possible. Note the the canon_entries here must have been malloced.
2349  The list format should be - first entry = owner, followed by group and other user
2350  entries, last entry = other.
2351
2352  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2353  are not ordered, and match on the most specific entry rather than walking a list,
2354  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2355
2356  Entry 0: owner : deny all except read and write.
2357  Entry 1: owner : allow read and write.
2358  Entry 2: group : deny all except read.
2359  Entry 3: group : allow read.
2360  Entry 4: Everyone : allow read.
2361
2362  But NT cannot display this in their ACL editor !
2363 ********************************************************************************/
2364
2365 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2366 {
2367         canon_ace *l_head = *pp_list_head;
2368         canon_ace *owner_ace = NULL;
2369         canon_ace *other_ace = NULL;
2370         canon_ace *ace = NULL;
2371
2372         for (ace = l_head; ace; ace = ace->next) {
2373                 if (ace->type == SMB_ACL_USER_OBJ)
2374                         owner_ace = ace;
2375                 else if (ace->type == SMB_ACL_OTHER) {
2376                         /* Last ace - this is "other" */
2377                         other_ace = ace;
2378                 }
2379         }
2380
2381         if (!owner_ace || !other_ace) {
2382                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2383                         filename ));
2384                 return;
2385         }
2386
2387         /*
2388          * The POSIX algorithm applies to owner first, and other last,
2389          * so ensure they are arranged in this order.
2390          */
2391
2392         if (owner_ace) {
2393                 DLIST_PROMOTE(l_head, owner_ace);
2394         }
2395
2396         if (other_ace) {
2397                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2398         }
2399
2400         /* We have probably changed the head of the list. */
2401
2402         *pp_list_head = l_head;
2403 }
2404
2405 /****************************************************************************
2406  Create a linked list of canonical ACE entries.
2407 ****************************************************************************/
2408
2409 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2410                                    const char *fname, SMB_ACL_T posix_acl,
2411                                    const SMB_STRUCT_STAT *psbuf,
2412                                    const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2413 {
2414         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2415         canon_ace *l_head = NULL;
2416         canon_ace *ace = NULL;
2417         canon_ace *next_ace = NULL;
2418         int entry_id = SMB_ACL_FIRST_ENTRY;
2419         bool is_default_acl = (the_acl_type == SMB_ACL_TYPE_DEFAULT);
2420         SMB_ACL_ENTRY_T entry;
2421         size_t ace_count;
2422
2423         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2424                 SMB_ACL_TAG_T tagtype;
2425                 SMB_ACL_PERMSET_T permset;
2426                 DOM_SID sid;
2427                 posix_id unix_ug;
2428                 enum ace_owner owner_type;
2429
2430                 entry_id = SMB_ACL_NEXT_ENTRY;
2431
2432                 /* Is this a MASK entry ? */
2433                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2434                         continue;
2435
2436                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2437                         continue;
2438
2439                 /* Decide which SID to use based on the ACL type. */
2440                 switch(tagtype) {
2441                         case SMB_ACL_USER_OBJ:
2442                                 /* Get the SID from the owner. */
2443                                 sid_copy(&sid, powner);
2444                                 unix_ug.uid = psbuf->st_ex_uid;
2445                                 owner_type = UID_ACE;
2446                                 break;
2447                         case SMB_ACL_USER:
2448                                 {
2449                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2450                                         if (puid == NULL) {
2451                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2452                                                 continue;
2453                                         }
2454                                         uid_to_sid( &sid, *puid);
2455                                         unix_ug.uid = *puid;
2456                                         owner_type = UID_ACE;
2457                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2458                                         break;
2459                                 }
2460                         case SMB_ACL_GROUP_OBJ:
2461                                 /* Get the SID from the owning group. */
2462                                 sid_copy(&sid, pgroup);
2463                                 unix_ug.gid = psbuf->st_ex_gid;
2464                                 owner_type = GID_ACE;
2465                                 break;
2466                         case SMB_ACL_GROUP:
2467                                 {
2468                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2469                                         if (pgid == NULL) {
2470                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2471                                                 continue;
2472                                         }
2473                                         gid_to_sid( &sid, *pgid);
2474                                         unix_ug.gid = *pgid;
2475                                         owner_type = GID_ACE;
2476                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2477                                         break;
2478                                 }
2479                         case SMB_ACL_MASK:
2480                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2481                                 continue; /* Don't count the mask as an entry. */
2482                         case SMB_ACL_OTHER:
2483                                 /* Use the Everyone SID */
2484                                 sid = global_sid_World;
2485                                 unix_ug.world = -1;
2486                                 owner_type = WORLD_ACE;
2487                                 break;
2488                         default:
2489                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2490                                 continue;
2491                 }
2492
2493                 /*
2494                  * Add this entry to the list.
2495                  */
2496
2497                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2498                         goto fail;
2499
2500                 ZERO_STRUCTP(ace);
2501                 ace->type = tagtype;
2502                 ace->perms = convert_permset_to_mode_t(conn, permset);
2503                 ace->attr = ALLOW_ACE;
2504                 ace->trustee = sid;
2505                 ace->unix_ug = unix_ug;
2506                 ace->owner_type = owner_type;
2507                 ace->ace_flags = get_pai_flags(pal, ace, is_default_acl);
2508
2509                 DLIST_ADD(l_head, ace);
2510         }
2511
2512         /*
2513          * This next call will ensure we have at least a user/group/world set.
2514          */
2515
2516         if (!ensure_canon_entry_valid(&l_head, conn->params,
2517                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2518                                       psbuf, False))
2519                 goto fail;
2520
2521         /*
2522          * Now go through the list, masking the permissions with the
2523          * acl_mask. Ensure all DENY Entries are at the start of the list.
2524          */
2525
2526         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", is_default_acl ?  "Default" : "Access"));
2527
2528         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2529                 next_ace = ace->next;
2530
2531                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2532                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2533                         ace->perms &= acl_mask;
2534
2535                 if (ace->perms == 0) {
2536                         DLIST_PROMOTE(l_head, ace);
2537                 }
2538
2539                 if( DEBUGLVL( 10 ) ) {
2540                         print_canon_ace(ace, ace_count);
2541                 }
2542         }
2543
2544         arrange_posix_perms(fname,&l_head );
2545
2546         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2547
2548         return l_head;
2549
2550   fail:
2551
2552         free_canon_ace_list(l_head);
2553         return NULL;
2554 }
2555
2556 /****************************************************************************
2557  Check if the current user group list contains a given group.
2558 ****************************************************************************/
2559
2560 bool current_user_in_group(gid_t gid)
2561 {
2562         int i;
2563
2564         for (i = 0; i < current_user.ut.ngroups; i++) {
2565                 if (current_user.ut.groups[i] == gid) {
2566                         return True;
2567                 }
2568         }
2569
2570         return False;
2571 }
2572
2573 /****************************************************************************
2574  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2575 ****************************************************************************/
2576
2577 static bool acl_group_override(connection_struct *conn,
2578                                const struct smb_filename *smb_fname)
2579 {
2580         if ((errno != EPERM) && (errno != EACCES)) {
2581                 return false;
2582         }
2583
2584         /* file primary group == user primary or supplementary group */
2585         if (lp_acl_group_control(SNUM(conn)) &&
2586             current_user_in_group(smb_fname->st.st_ex_gid)) {
2587                 return true;
2588         }
2589
2590         /* user has writeable permission */
2591         if (lp_dos_filemode(SNUM(conn)) &&
2592             can_write_to_file(conn, smb_fname)) {
2593                 return true;
2594         }
2595
2596         return false;
2597 }
2598
2599 /****************************************************************************
2600  Attempt to apply an ACL to a file or directory.
2601 ****************************************************************************/
2602
2603 static bool set_canon_ace_list(files_struct *fsp,
2604                                 canon_ace *the_ace,
2605                                 bool default_ace,
2606                                 const SMB_STRUCT_STAT *psbuf,
2607                                 bool *pacl_set_support)
2608 {
2609         connection_struct *conn = fsp->conn;
2610         bool ret = False;
2611         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2612         canon_ace *p_ace;
2613         int i;
2614         SMB_ACL_ENTRY_T mask_entry;
2615         bool got_mask_entry = False;
2616         SMB_ACL_PERMSET_T mask_permset;
2617         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2618         bool needs_mask = False;
2619         mode_t mask_perms = 0;
2620
2621         /* Use the psbuf that was passed in. */
2622         if (psbuf != &fsp->fsp_name->st) {
2623                 fsp->fsp_name->st = *psbuf;
2624         }
2625
2626 #if defined(POSIX_ACL_NEEDS_MASK)
2627         /* HP-UX always wants to have a mask (called "class" there). */
2628         needs_mask = True;
2629 #endif
2630
2631         if (the_acl == NULL) {
2632
2633                 if (!no_acl_syscall_error(errno)) {
2634                         /*
2635                          * Only print this error message if we have some kind of ACL
2636                          * support that's not working. Otherwise we would always get this.
2637                          */
2638                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2639                                 default_ace ? "default" : "file", strerror(errno) ));
2640                 }
2641                 *pacl_set_support = False;
2642                 goto fail;
2643         }
2644
2645         if( DEBUGLVL( 10 )) {
2646                 dbgtext("set_canon_ace_list: setting ACL:\n");
2647                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2648                         print_canon_ace( p_ace, i);
2649                 }
2650         }
2651
2652         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2653                 SMB_ACL_ENTRY_T the_entry;
2654                 SMB_ACL_PERMSET_T the_permset;
2655
2656                 /*
2657                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2658                  * named group entries. But if there is an ACL_MASK entry, it applies
2659                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2660                  * so that it doesn't deny (i.e., mask off) any permissions.
2661                  */
2662
2663                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2664                         needs_mask = True;
2665                         mask_perms |= p_ace->perms;
2666                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2667                         mask_perms |= p_ace->perms;
2668                 }
2669
2670                 /*
2671                  * Get the entry for this ACE.
2672                  */
2673
2674                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2675                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2676                                 i, strerror(errno) ));
2677                         goto fail;
2678                 }
2679
2680                 if (p_ace->type == SMB_ACL_MASK) {
2681                         mask_entry = the_entry;
2682                         got_mask_entry = True;
2683                 }
2684
2685                 /*
2686                  * Ok - we now know the ACL calls should be working, don't
2687                  * allow fallback to chmod.
2688                  */
2689
2690                 *pacl_set_support = True;
2691
2692                 /*
2693                  * Initialise the entry from the canon_ace.
2694                  */
2695
2696                 /*
2697                  * First tell the entry what type of ACE this is.
2698                  */
2699
2700                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2701                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2702                                 i, strerror(errno) ));
2703                         goto fail;
2704                 }
2705
2706                 /*
2707                  * Only set the qualifier (user or group id) if the entry is a user
2708                  * or group id ACE.
2709                  */
2710
2711                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2712                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2713                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2714                                         i, strerror(errno) ));
2715                                 goto fail;
2716                         }
2717                 }
2718
2719                 /*
2720                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2721                  */
2722
2723                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2724                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2725                                 i, strerror(errno) ));
2726                         goto fail;
2727                 }
2728
2729                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2730                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2731                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2732                         goto fail;
2733                 }
2734
2735                 /*
2736                  * ..and apply them to the entry.
2737                  */
2738
2739                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2740                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2741                                 i, strerror(errno) ));
2742                         goto fail;
2743                 }
2744
2745                 if( DEBUGLVL( 10 ))
2746                         print_canon_ace( p_ace, i);
2747
2748         }
2749
2750         if (needs_mask && !got_mask_entry) {
2751                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2752                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2753                         goto fail;
2754                 }
2755
2756                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2757                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2758                         goto fail;
2759                 }
2760
2761                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2762                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2763                         goto fail;
2764                 }
2765
2766                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2767                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2768                         goto fail;
2769                 }
2770
2771                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2772                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2773                         goto fail;
2774                 }
2775         }
2776
2777         /*
2778          * Finally apply it to the file or directory.
2779          */
2780
2781         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2782                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2783                                              the_acl_type, the_acl) == -1) {
2784                         /*
2785                          * Some systems allow all the above calls and only fail with no ACL support
2786                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2787                          */
2788                         if (no_acl_syscall_error(errno)) {
2789                                 *pacl_set_support = False;
2790                         }
2791
2792                         if (acl_group_override(conn, fsp->fsp_name)) {
2793                                 int sret;
2794
2795                                 DEBUG(5,("set_canon_ace_list: acl group "
2796                                          "control on and current user in file "
2797                                          "%s primary group.\n",
2798                                          fsp_str_dbg(fsp)));
2799
2800                                 become_root();
2801                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2802                                     fsp->fsp_name->base_name, the_acl_type,
2803                                     the_acl);
2804                                 unbecome_root();
2805                                 if (sret == 0) {
2806                                         ret = True;
2807                                 }
2808                         }
2809
2810                         if (ret == False) {
2811                                 DEBUG(2,("set_canon_ace_list: "
2812                                          "sys_acl_set_file type %s failed for "
2813                                          "file %s (%s).\n",
2814                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2815                                          "directory default" : "file",
2816                                          fsp_str_dbg(fsp), strerror(errno)));
2817                                 goto fail;
2818                         }
2819                 }
2820         } else {
2821                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2822                         /*
2823                          * Some systems allow all the above calls and only fail with no ACL support
2824                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2825                          */
2826                         if (no_acl_syscall_error(errno)) {
2827                                 *pacl_set_support = False;
2828                         }
2829
2830                         if (acl_group_override(conn, fsp->fsp_name)) {
2831                                 int sret;
2832
2833                                 DEBUG(5,("set_canon_ace_list: acl group "
2834                                          "control on and current user in file "
2835                                          "%s primary group.\n",
2836                                          fsp_str_dbg(fsp)));
2837
2838                                 become_root();
2839                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2840                                 unbecome_root();
2841                                 if (sret == 0) {
2842                                         ret = True;
2843                                 }
2844                         }
2845
2846                         if (ret == False) {
2847                                 DEBUG(2,("set_canon_ace_list: "
2848                                          "sys_acl_set_file failed for file %s "
2849                                          "(%s).\n",
2850                                          fsp_str_dbg(fsp), strerror(errno)));
2851                                 goto fail;
2852                         }
2853                 }
2854         }
2855
2856         ret = True;
2857
2858   fail:
2859
2860         if (the_acl != NULL) {
2861                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2862         }
2863
2864         return ret;
2865 }
2866
2867 /****************************************************************************
2868  Find a particular canon_ace entry.
2869 ****************************************************************************/
2870
2871 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2872 {
2873         while (list) {
2874                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2875                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2876                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2877                         break;
2878                 list = list->next;
2879         }
2880         return list;
2881 }
2882
2883 /****************************************************************************
2884
2885 ****************************************************************************/
2886
2887 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2888 {
2889         SMB_ACL_ENTRY_T entry;
2890
2891         if (!the_acl)
2892                 return NULL;
2893         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2894                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2895                 return NULL;
2896         }
2897         return the_acl;
2898 }
2899
2900 /****************************************************************************
2901  Convert a canon_ace to a generic 3 element permission - if possible.
2902 ****************************************************************************/
2903
2904 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2905
2906 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2907 {
2908         int snum = SNUM(fsp->conn);
2909         size_t ace_count = count_canon_ace_list(file_ace_list);
2910         canon_ace *ace_p;
2911         canon_ace *owner_ace = NULL;
2912         canon_ace *group_ace = NULL;
2913         canon_ace *other_ace = NULL;
2914         mode_t and_bits;
2915         mode_t or_bits;
2916
2917         if (ace_count != 3) {
2918                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2919                          "entries for file %s to convert to posix perms.\n",
2920                          fsp_str_dbg(fsp)));
2921                 return False;
2922         }
2923
2924         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2925                 if (ace_p->owner_type == UID_ACE)
2926                         owner_ace = ace_p;
2927                 else if (ace_p->owner_type == GID_ACE)
2928                         group_ace = ace_p;
2929                 else if (ace_p->owner_type == WORLD_ACE)
2930                         other_ace = ace_p;
2931         }
2932
2933         if (!owner_ace || !group_ace || !other_ace) {
2934                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
2935                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
2936                 return False;
2937         }
2938
2939         *posix_perms = (mode_t)0;
2940
2941         *posix_perms |= owner_ace->perms;
2942         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2943         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2944         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2945         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2946         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2947         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2948
2949         /* The owner must have at least read access. */
2950
2951         *posix_perms |= S_IRUSR;
2952         if (fsp->is_directory)
2953                 *posix_perms |= (S_IWUSR|S_IXUSR);
2954
2955         /* If requested apply the masks. */
2956
2957         /* Get the initial bits to apply. */
2958
2959         if (fsp->is_directory) {
2960                 and_bits = lp_dir_security_mask(snum);
2961                 or_bits = lp_force_dir_security_mode(snum);
2962         } else {
2963                 and_bits = lp_security_mask(snum);
2964                 or_bits = lp_force_security_mode(snum);
2965         }
2966
2967         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2968
2969         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
2970                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
2971                   (int)group_ace->perms, (int)other_ace->perms,
2972                   (int)*posix_perms, fsp_str_dbg(fsp)));
2973
2974         return True;
2975 }
2976
2977 /****************************************************************************
2978   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2979   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2980   with CI|OI set so it is inherited and also applies to the directory.
2981   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2982 ****************************************************************************/
2983
2984 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2985 {
2986         size_t i, j;
2987
2988         for (i = 0; i < num_aces; i++) {
2989                 for (j = i+1; j < num_aces; j++) {
2990                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2991                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2992                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2993                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2994
2995                         /* We know the lower number ACE's are file entries. */
2996                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2997                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2998                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2999                                 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3000                                 (i_inh == j_inh) &&
3001                                 (i_flags_ni == 0) &&
3002                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3003                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3004                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3005                                 /*
3006                                  * W2K wants to have access allowed zero access ACE's
3007                                  * at the end of the list. If the mask is zero, merge
3008                                  * the non-inherited ACE onto the inherited ACE.
3009                                  */
3010
3011                                 if (nt_ace_list[i].access_mask == 0) {
3012                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3013                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3014                                         if (num_aces - i - 1 > 0)
3015                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3016                                                                 sizeof(SEC_ACE));
3017
3018                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3019                                                 (unsigned int)i, (unsigned int)j ));
3020                                 } else {
3021                                         /*
3022                                          * These are identical except for the flags.
3023                                          * Merge the inherited ACE onto the non-inherited ACE.
3024                                          */
3025
3026                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3027                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3028                                         if (num_aces - j - 1 > 0)
3029                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3030                                                                 sizeof(SEC_ACE));
3031
3032                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3033                                                 (unsigned int)j, (unsigned int)i ));
3034                                 }
3035                                 num_aces--;
3036                                 break;
3037                         }
3038                 }
3039         }
3040
3041         return num_aces;
3042 }
3043
3044 /*
3045  * Add or Replace ACE entry.
3046  * In some cases we need to add a specific ACE for compatibility reasons.
3047  * When doing that we must make sure we are not actually creating a duplicate
3048  * entry. So we need to search whether an ACE entry already exist and eventually
3049  * replacce the access mask, or add a completely new entry if none was found.
3050  *
3051  * This function assumes the array has enough space to add a new entry without
3052  * any reallocation of memory.
3053  */
3054
3055 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3056                                 const DOM_SID *sid, enum security_ace_type type,
3057                                 uint32_t mask, uint8_t flags)
3058 {
3059         int i;
3060
3061         /* first search for a duplicate */
3062         for (i = 0; i < *num_aces; i++) {
3063                 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3064                     (nt_ace_list[i].flags == flags)) break;
3065         }
3066
3067         if (i < *num_aces) { /* found */
3068                 nt_ace_list[i].type = type;
3069                 nt_ace_list[i].access_mask = mask;
3070                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3071                            i, sid_string_dbg(sid), flags));
3072                 return;
3073         }
3074
3075         /* not found, append it */
3076         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3077 }
3078
3079
3080 /****************************************************************************
3081  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3082  the space for the return elements and returns the size needed to return the
3083  security descriptor. This should be the only external function needed for
3084  the UNIX style get ACL.
3085 ****************************************************************************/
3086
3087 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3088                                       const char *name,
3089                                       const SMB_STRUCT_STAT *sbuf,
3090                                       struct pai_val *pal,
3091                                       SMB_ACL_T posix_acl,
3092                                       SMB_ACL_T def_acl,
3093                                       uint32_t security_info,
3094                                       SEC_DESC **ppdesc)
3095 {
3096         DOM_SID owner_sid;
3097         DOM_SID group_sid;
3098         size_t sd_size = 0;
3099         SEC_ACL *psa = NULL;
3100         size_t num_acls = 0;
3101         size_t num_def_acls = 0;
3102         size_t num_aces = 0;
3103         canon_ace *file_ace = NULL;
3104         canon_ace *dir_ace = NULL;
3105         SEC_ACE *nt_ace_list = NULL;
3106         size_t num_profile_acls = 0;
3107         DOM_SID orig_owner_sid;
3108         SEC_DESC *psd = NULL;
3109         int i;
3110
3111         /*
3112          * Get the owner, group and world SIDs.
3113          */
3114
3115         create_file_sids(sbuf, &owner_sid, &group_sid);
3116
3117         if (lp_profile_acls(SNUM(conn))) {
3118                 /* For WXP SP1 the owner must be administrators. */
3119                 sid_copy(&orig_owner_sid, &owner_sid);
3120                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3121                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3122                 num_profile_acls = 3;
3123         }
3124
3125         if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3126
3127                 /*
3128                  * In the optimum case Creator Owner and Creator Group would be used for
3129                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3130                  * would lead to usability problems under Windows: The Creator entries
3131                  * are only available in browse lists of directories and not for files;
3132                  * additionally the identity of the owning group couldn't be determined.
3133                  * We therefore use those identities only for Default ACLs.
3134                  */
3135
3136                 /* Create the canon_ace lists. */
3137                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3138                                             &owner_sid, &group_sid, pal,
3139                                             SMB_ACL_TYPE_ACCESS);
3140
3141                 /* We must have *some* ACLS. */
3142
3143                 if (count_canon_ace_list(file_ace) == 0) {
3144                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3145                         goto done;
3146                 }
3147
3148                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3149                         dir_ace = canonicalise_acl(conn, name, def_acl,
3150                                                    sbuf,
3151                                                    &global_sid_Creator_Owner,
3152                                                    &global_sid_Creator_Group,
3153                                                    pal, SMB_ACL_TYPE_DEFAULT);
3154                 }
3155
3156                 /*
3157                  * Create the NT ACE list from the canonical ace lists.
3158                  */
3159
3160                 {
3161                         canon_ace *ace;
3162                         enum security_ace_type nt_acl_type;
3163
3164                         if (nt4_compatible_acls() && dir_ace) {
3165                                 /*
3166                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3167                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3168                                  * remove entries from the Access ACL if the
3169                                  * corresponding Default ACL entries have also been
3170                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3171                                  * are exceptions. We can do nothing
3172                                  * intelligent if the Default ACL contains entries that
3173                                  * are not also contained in the Access ACL, so this
3174                                  * case will still fail under NT 4.
3175                                  */
3176
3177                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3178                                 if (ace && !ace->perms) {
3179                                         DLIST_REMOVE(dir_ace, ace);
3180                                         SAFE_FREE(ace);
3181
3182                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3183                                         if (ace && !ace->perms) {
3184                                                 DLIST_REMOVE(file_ace, ace);
3185                                                 SAFE_FREE(ace);
3186                                         }
3187                                 }
3188
3189                                 /*
3190                                  * WinNT doesn't usually have Creator Group
3191                                  * in browse lists, so we send this entry to
3192                                  * WinNT even if it contains no relevant
3193                                  * permissions. Once we can add
3194                                  * Creator Group to browse lists we can
3195                                  * re-enable this.
3196                                  */
3197
3198 #if 0
3199                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3200                                 if (ace && !ace->perms) {
3201                                         DLIST_REMOVE(dir_ace, ace);
3202                                         SAFE_FREE(ace);
3203                                 }
3204 #endif
3205
3206                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3207                                 if (ace && !ace->perms) {
3208                                         DLIST_REMOVE(file_ace, ace);
3209                                         SAFE_FREE(ace);
3210                                 }
3211                         }
3212
3213                         num_acls = count_canon_ace_list(file_ace);
3214                         num_def_acls = count_canon_ace_list(dir_ace);
3215
3216                         /* Allocate the ace list. */
3217                         if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3218                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3219                                 goto done;
3220                         }
3221
3222                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3223
3224                         /*
3225                          * Create the NT ACE list from the canonical ace lists.
3226                          */
3227
3228                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3229                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3230                                                 &nt_acl_type,
3231                                                 ace->perms,
3232                                                 S_ISDIR(sbuf->st_ex_mode));
3233                                 init_sec_ace(&nt_ace_list[num_aces++],
3234                                         &ace->trustee,
3235                                         nt_acl_type,
3236                                         acc,
3237                                         ace->ace_flags);
3238                         }
3239
3240                         /* The User must have access to a profile share - even
3241                          * if we can't map the SID. */
3242                         if (lp_profile_acls(SNUM(conn))) {
3243                                 add_or_replace_ace(nt_ace_list, &num_aces,
3244                                                    &global_sid_Builtin_Users,
3245                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3246                                                    FILE_GENERIC_ALL, 0);
3247                         }
3248
3249                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3250                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3251                                                 &nt_acl_type,
3252                                                 ace->perms,
3253                                                 S_ISDIR(sbuf->st_ex_mode));
3254                                 init_sec_ace(&nt_ace_list[num_aces++],
3255                                         &ace->trustee,
3256                                         nt_acl_type,
3257                                         acc,
3258                                         ace->ace_flags |
3259                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3260                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3261                                         SEC_ACE_FLAG_INHERIT_ONLY);
3262                         }
3263
3264                         /* The User must have access to a profile share - even
3265                          * if we can't map the SID. */
3266                         if (lp_profile_acls(SNUM(conn))) {
3267                                 add_or_replace_ace(nt_ace_list, &num_aces,
3268                                                 &global_sid_Builtin_Users,
3269                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3270                                                 FILE_GENERIC_ALL,
3271                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3272                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3273                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3274                         }
3275
3276                         /*
3277                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3278                          * Win2K needs this to get the inheritance correct when replacing ACLs
3279                          * on a directory tree. Based on work by Jim @ IBM.
3280                          */
3281
3282                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3283
3284                         if (lp_profile_acls(SNUM(conn))) {
3285                                 for (i = 0; i < num_aces; i++) {
3286                                         if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3287                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3288                                                                    &orig_owner_sid,
3289                                                                    nt_ace_list[i].type,
3290                                                                    nt_ace_list[i].access_mask,
3291                                                                    nt_ace_list[i].flags);
3292                                                 break;
3293                                         }
3294                                 }
3295                         }
3296                 }
3297
3298                 if (num_aces) {
3299                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3300                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3301                                 goto done;
3302                         }
3303                 }
3304         } /* security_info & DACL_SECURITY_INFORMATION */
3305
3306         psd = make_standard_sec_desc( talloc_tos(),
3307                         (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3308                         (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3309                         psa,
3310                         &sd_size);
3311
3312         if(!psd) {
3313                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3314                 sd_size = 0;
3315                 goto done;
3316         }
3317
3318         /*
3319          * Windows 2000: The DACL_PROTECTED flag in the security
3320          * descriptor marks the ACL as non-inheriting, i.e., no
3321          * ACEs from higher level directories propagate to this
3322          * ACL. In the POSIX ACL model permissions are only
3323          * inherited at file create time, so ACLs never contain
3324          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3325          * flag doesn't seem to bother Windows NT.
3326          * Always set this if map acl inherit is turned off.
3327          */
3328         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3329                 psd->type |= SEC_DESC_DACL_PROTECTED;
3330         } else {
3331                 psd->type |= pal->sd_type;
3332         }
3333
3334         if (psd->dacl) {
3335                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3336         }
3337
3338         *ppdesc = psd;
3339
3340  done:
3341
3342         if (posix_acl) {
3343                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3344         }
3345         if (def_acl) {
3346                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3347         }
3348         free_canon_ace_list(file_ace);
3349         free_canon_ace_list(dir_ace);
3350         free_inherited_info(pal);
3351         SAFE_FREE(nt_ace_list);
3352
3353         return NT_STATUS_OK;
3354 }
3355
3356 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3357                            SEC_DESC **ppdesc)
3358 {
3359         SMB_STRUCT_STAT sbuf;
3360         SMB_ACL_T posix_acl = NULL;
3361         struct pai_val *pal;
3362
3363         *ppdesc = NULL;
3364
3365         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3366                   fsp_str_dbg(fsp)));
3367
3368         /* can it happen that fsp_name == NULL ? */
3369         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3370                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3371                                         security_info, ppdesc);
3372         }
3373
3374         /* Get the stat struct for the owner info. */
3375         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3376                 return map_nt_error_from_unix(errno);
3377         }
3378
3379         /* Get the ACL from the fd. */
3380         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3381
3382         pal = fload_inherited_info(fsp);
3383
3384         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3385                                        &sbuf, pal, posix_acl, NULL,
3386                                        security_info, ppdesc);
3387 }
3388
3389 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3390                           uint32_t security_info, SEC_DESC **ppdesc)
3391 {
3392         SMB_ACL_T posix_acl = NULL;
3393         SMB_ACL_T def_acl = NULL;
3394         struct pai_val *pal;
3395         struct smb_filename smb_fname;
3396         int ret;
3397
3398         *ppdesc = NULL;
3399
3400         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3401
3402         ZERO_STRUCT(smb_fname);
3403         smb_fname.base_name = discard_const_p(char, name);
3404
3405         /* Get the stat struct for the owner info. */
3406         if (lp_posix_pathnames()) {
3407                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3408         } else {
3409                 ret = SMB_VFS_STAT(conn, &smb_fname);
3410         }
3411
3412         if (ret == -1) {
3413                 return map_nt_error_from_unix(errno);
3414         }
3415
3416         /* Get the ACL from the path. */
3417         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3418
3419         /* If it's a directory get the default POSIX ACL. */
3420         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3421                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3422                 def_acl = free_empty_sys_acl(conn, def_acl);
3423         }
3424
3425         pal = load_inherited_info(conn, name);
3426
3427         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3428                                        posix_acl, def_acl, security_info,
3429                                        ppdesc);
3430 }
3431
3432 /****************************************************************************
3433  Try to chown a file. We will be able to chown it under the following conditions.
3434
3435   1) If we have root privileges, then it will just work.
3436   2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3437   3) If we have SeRestorePrivilege we can change the user to any other user.
3438   4) If we have write permission to the file and dos_filemodes is set
3439      then allow chown to the currently authenticated user.
3440 ****************************************************************************/
3441
3442 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3443               uid_t uid, gid_t gid)
3444 {
3445         int ret;
3446         files_struct *fsp;
3447
3448         if(!CAN_WRITE(conn)) {
3449                 return -1;
3450         }
3451
3452         /* Case (1). */
3453         /* try the direct way first */
3454         if (lp_posix_pathnames()) {
3455                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3456         } else {
3457                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3458         }
3459
3460         if (ret == 0)
3461                 return 0;
3462
3463         /* Case (2) / (3) */
3464         if (lp_enable_privileges()) {
3465
3466                 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3467                                                               &se_take_ownership);
3468                 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3469                                                        &se_restore);
3470
3471                 /* Case (2) */
3472                 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3473                 /* Case (3) */
3474                      ( has_restore_priv ) ) {
3475
3476                         become_root();
3477                         /* Keep the current file gid the same - take ownership doesn't imply group change. */
3478                         if (lp_posix_pathnames()) {
3479                                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3480                                                     (gid_t)-1);
3481                         } else {
3482                                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3483                                                     (gid_t)-1);
3484                         }
3485                         unbecome_root();
3486                         return ret;
3487                 }
3488         }
3489
3490         /* Case (4). */
3491         if (!lp_dos_filemode(SNUM(conn))) {
3492                 errno = EPERM;
3493                 return -1;
3494         }
3495
3496         /* only allow chown to the current user. This is more secure,
3497            and also copes with the case where the SID in a take ownership ACL is
3498            a local SID on the users workstation
3499         */
3500         if (uid != current_user.ut.uid) {
3501                 errno = EPERM;
3502                 return -1;
3503         }
3504
3505         if (lp_posix_pathnames()) {
3506                 ret = SMB_VFS_LSTAT(conn, smb_fname);
3507         } else {
3508                 ret = SMB_VFS_STAT(conn, smb_fname);
3509         }
3510
3511         if (ret == -1) {
3512                 return -1;
3513         }
3514
3515         if (!NT_STATUS_IS_OK(open_file_fchmod(conn, smb_fname, &fsp))) {
3516                 return -1;
3517         }
3518
3519         become_root();
3520         /* Keep the current file gid the same. */
3521         if (fsp->fh->fd == -1) {
3522                 if (lp_posix_pathnames()) {
3523                         ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3524                                             (gid_t)-1);
3525                 } else {
3526                         ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3527                                             (gid_t)-1);
3528                 }
3529         } else {
3530                 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3531         }
3532         unbecome_root();
3533
3534         close_file(NULL, fsp, NORMAL_CLOSE);
3535
3536         return ret;
3537 }
3538
3539 #if 0
3540 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3541
3542 /****************************************************************************
3543  Take care of parent ACL inheritance.
3544 ****************************************************************************/
3545
3546 NTSTATUS append_parent_acl(files_struct *fsp,
3547                                 const SEC_DESC *pcsd,
3548                                 SEC_DESC **pp_new_sd)
3549 {
3550         struct smb_filename *smb_dname = NULL;
3551         SEC_DESC *parent_sd = NULL;
3552         files_struct *parent_fsp = NULL;
3553         TALLOC_CTX *mem_ctx = talloc_tos();
3554         char *parent_name = NULL;
3555         SEC_ACE *new_ace = NULL;
3556         unsigned int num_aces = pcsd->dacl->num_aces;
3557         NTSTATUS status;
3558         int info;
3559         unsigned int i, j;
3560         SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3561         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3562
3563         if (psd == NULL) {
3564                 return NT_STATUS_NO_MEMORY;
3565         }
3566
3567         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3568                             NULL)) {
3569                 return NT_STATUS_NO_MEMORY;
3570         }
3571
3572         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3573                                             &smb_dname);
3574         if (!NT_STATUS_IS_OK(status)) {
3575                 goto fail;
3576         }
3577
3578         status = SMB_VFS_CREATE_FILE(
3579                 fsp->conn,                              /* conn */
3580                 NULL,                                   /* req */
3581                 0,                                      /* root_dir_fid */
3582                 smb_dname,                              /* fname */
3583                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3584                 FILE_SHARE_NONE,                        /* share_access */
3585                 FILE_OPEN,                              /* create_disposition*/
3586                 FILE_DIRECTORY_FILE,                    /* create_options */
3587                 0,                                      /* file_attributes */
3588                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3589                 0,                                      /* allocation_size */
3590                 NULL,                                   /* sd */
3591                 NULL,                                   /* ea_list */
3592                 &parent_fsp,                            /* result */
3593                 &info);                                 /* pinfo */
3594
3595         if (!NT_STATUS_IS_OK(status)) {
3596                 TALLOC_FREE(smb_dname);
3597                 return status;
3598         }
3599
3600         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3601                                     DACL_SECURITY_INFORMATION, &parent_sd );
3602
3603         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3604         TALLOC_FREE(smb_dname);
3605
3606         if (!NT_STATUS_IS_OK(status)) {
3607                 return status;
3608         }
3609
3610         /*
3611          * Make room for potentially all the ACLs from
3612          * the parent. We used to add the ugw triple here,
3613          * as we knew we were dealing with POSIX ACLs.
3614          * We no longer need to do so as we can guarentee
3615          * that a default ACL from the parent directory will
3616          * be well formed for POSIX ACLs if it came from a
3617          * POSIX ACL source, and if we're not writing to a
3618          * POSIX ACL sink then we don't care if it's not well
3619          * formed. JRA.
3620          */
3621
3622         num_aces += parent_sd->dacl->num_aces;
3623
3624         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3625                                         num_aces)) == NULL) {
3626                 return NT_STATUS_NO_MEMORY;
3627         }
3628
3629         /* Start by copying in all the given ACE entries. */
3630         for (i = 0; i < psd->dacl->num_aces; i++) {
3631                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3632         }
3633
3634         /*
3635          * Note that we're ignoring "inherit permissions" here
3636          * as that really only applies to newly created files. JRA.
3637          */
3638
3639         /* Finally append any inherited ACEs. */
3640         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3641                 SEC_ACE *se = &parent_sd->dacl->aces[j];
3642
3643                 if (fsp->is_directory) {
3644                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3645                                 /* Doesn't apply to a directory - ignore. */
3646                                 DEBUG(10,("append_parent_acl: directory %s "
3647                                         "ignoring non container "
3648                                         "inherit flags %u on ACE with sid %s "
3649                                         "from parent %s\n",
3650                                         fsp_str_dbg(fsp),
3651                                         (unsigned int)se->flags,
3652                                         sid_string_dbg(&se->trustee),
3653                                         parent_name));
3654                                 continue;
3655                         }
3656                 } else {
3657                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3658                                 /* Doesn't apply to a file - ignore. */
3659                                 DEBUG(10,("append_parent_acl: file %s "
3660                                         "ignoring non object "
3661                                         "inherit flags %u on ACE with sid %s "
3662                                         "from parent %s\n",
3663                                         fsp_str_dbg(fsp),
3664                                         (unsigned int)se->flags,
3665                                         sid_string_dbg(&se->trustee),
3666                                         parent_name));
3667                                 continue;
3668                         }
3669                 }
3670
3671                 if (is_dacl_protected) {
3672                         /* If the DACL is protected it means we must
3673                          * not overwrite an existing ACE entry with the
3674                          * same SID. This is order N^2. Ouch :-(. JRA. */
3675                         unsigned int k;
3676                         for (k = 0; k < psd->dacl->num_aces; k++) {
3677                                 if (sid_equal(&psd->dacl->aces[k].trustee,
3678                                                 &se->trustee)) {
3679                                         break;
3680                                 }
3681                         }
3682                         if (k < psd->dacl->num_aces) {
3683                                 /* SID matched. Ignore. */
3684                                 DEBUG(10,("append_parent_acl: path %s "
3685                                         "ignoring ACE with protected sid %s "
3686                                         "from parent %s\n",
3687                                         fsp_str_dbg(fsp),
3688                                         sid_string_dbg(&se->trustee),
3689                                         parent_name));
3690                                 continue;
3691                         }
3692                 }
3693
3694                 sec_ace_copy(&new_ace[i], se);
3695                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3696                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3697                 }
3698                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3699
3700                 if (fsp->is_directory) {
3701                         /*
3702                          * Strip off any inherit only. It's applied.
3703                          */
3704                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3705                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3706                                 /* No further inheritance. */
3707                                 new_ace[i].flags &=
3708                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3709                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3710                         }
3711                 } else {
3712                         /*
3713                          * Strip off any container or inherit
3714                          * flags, they can't apply to objects.
3715                          */
3716                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3717                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3718                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3719                 }
3720                 i++;
3721
3722                 DEBUG(10,("append_parent_acl: path %s "
3723                         "inheriting ACE with sid %s "
3724                         "from parent %s\n",
3725                         fsp_str_dbg(fsp),
3726                         sid_string_dbg(&se->trustee),
3727                         parent_name));
3728         }
3729
3730         psd->dacl->aces = new_ace;
3731         psd->dacl->num_aces = i;
3732         psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3733                          SE_DESC_DACL_AUTO_INHERIT_REQ);
3734
3735         *pp_new_sd = psd;
3736         return status;
3737 }
3738 #endif
3739
3740 /****************************************************************************
3741  Reply to set a security descriptor on an fsp. security_info_sent is the
3742  description of the following NT ACL.
3743  This should be the only external function needed for the UNIX style set ACL.
3744 ****************************************************************************/
3745
3746 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd_orig)
3747 {
3748         connection_struct *conn = fsp->conn;
3749         uid_t user = (uid_t)-1;
3750         gid_t grp = (gid_t)-1;
3751         DOM_SID file_owner_sid;
3752         DOM_SID file_grp_sid;
3753         canon_ace *file_ace_list = NULL;
3754         canon_ace *dir_ace_list = NULL;
3755         bool acl_perms = False;
3756         mode_t orig_mode = (mode_t)0;
3757         NTSTATUS status;
3758         bool set_acl_as_root = false;
3759         bool acl_set_support = false;
3760         bool ret = false;
3761         SEC_DESC *psd = NULL;
3762
3763         DEBUG(10,("set_nt_acl: called for file %s\n",
3764                   fsp_str_dbg(fsp)));
3765
3766         if (!CAN_WRITE(conn)) {
3767                 DEBUG(10,("set acl rejected on read-only share\n"));
3768                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3769         }
3770
3771         if (!psd_orig) {
3772                 return NT_STATUS_INVALID_PARAMETER;
3773         }
3774
3775         psd = dup_sec_desc(talloc_tos(), psd_orig);
3776         if (!psd) {
3777                 return NT_STATUS_NO_MEMORY;
3778         }
3779
3780         /*
3781          * Get the current state of the file.
3782          */
3783
3784         status = vfs_stat_fsp(fsp);
3785         if (!NT_STATUS_IS_OK(status)) {
3786                 return status;
3787         }
3788
3789         /* Save the original element we check against. */
3790         orig_mode = fsp->fsp_name->st.st_ex_mode;
3791
3792         /*
3793          * Unpack the user/group/world id's.
3794          */
3795
3796         /* POSIX can't cope with missing owner/group. */
3797         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3798                 security_info_sent &= ~SECINFO_OWNER;
3799         }
3800         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3801                 security_info_sent &= ~SECINFO_GROUP;
3802         }
3803
3804         status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3805         if (!NT_STATUS_IS_OK(status)) {
3806                 return status;
3807         }
3808
3809         /*
3810          * Do we need to chown ? If so this must be done first as the incoming
3811          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3812          * Noticed by Simo.
3813          */
3814
3815         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3816             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3817
3818                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3819                          fsp_str_dbg(fsp), (unsigned int)user,
3820                          (unsigned int)grp));
3821
3822                 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3823                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3824                                  "= %s.\n", fsp_str_dbg(fsp),
3825                                  (unsigned int)user, (unsigned int)grp,
3826                                  strerror(errno)));
3827                         if (errno == EPERM) {
3828                                 return NT_STATUS_INVALID_OWNER;
3829                         }
3830                         return map_nt_error_from_unix(errno);
3831                 }
3832
3833                 /*
3834                  * Recheck the current state of the file, which may have changed.
3835                  * (suid/sgid bits, for instance)
3836                  */
3837
3838                 status = vfs_stat_fsp(fsp);
3839                 if (!NT_STATUS_IS_OK(status)) {
3840                         return status;
3841                 }
3842
3843                 /* Save the original element we check against. */
3844                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3845
3846                 /* If we successfully chowned, we know we must
3847                  * be able to set the acl, so do it as root.
3848                  */
3849                 set_acl_as_root = true;
3850         }
3851
3852         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3853
3854         if((security_info_sent & SECINFO_DACL) &&
3855                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3856                         (psd->dacl == NULL)) {
3857                 SEC_ACE ace[3];
3858
3859                 /* We can't have NULL DACL in POSIX.
3860                    Use owner/group/Everyone -> full access. */
3861
3862                 init_sec_ace(&ace[0],
3863                                 &file_owner_sid,
3864                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3865                                 GENERIC_ALL_ACCESS,
3866                                 0);
3867                 init_sec_ace(&ace[1],
3868                                 &file_grp_sid,
3869                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3870                                 GENERIC_ALL_ACCESS,
3871                                 0);
3872                 init_sec_ace(&ace[2],
3873                                 &global_sid_World,
3874                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3875                                 GENERIC_ALL_ACCESS,
3876                                 0);
3877                 psd->dacl = make_sec_acl(talloc_tos(),
3878                                         NT4_ACL_REVISION,
3879                                         3,
3880                                         ace);
3881                 if (psd->dacl == NULL) {
3882                         return NT_STATUS_NO_MEMORY;
3883                 }
3884                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3885         }
3886
3887         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3888                                      &file_grp_sid, &file_ace_list,
3889                                      &dir_ace_list, security_info_sent, psd);
3890
3891         /* Ignore W2K traverse DACL set. */
3892         if (!file_ace_list && !dir_ace_list) {
3893                 return NT_STATUS_OK;
3894         }
3895
3896         if (!acl_perms) {
3897                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3898                 free_canon_ace_list(file_ace_list);
3899                 free_canon_ace_list(dir_ace_list);
3900                 return NT_STATUS_ACCESS_DENIED;
3901         }
3902
3903         /*
3904          * Only change security if we got a DACL.
3905          */
3906
3907         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3908                 free_canon_ace_list(file_ace_list);
3909                 free_canon_ace_list(dir_ace_list);
3910                 return NT_STATUS_OK;
3911         }
3912
3913         /*
3914          * Try using the POSIX ACL set first. Fall back to chmod if
3915          * we have no ACL support on this filesystem.
3916          */
3917
3918         if (acl_perms && file_ace_list) {
3919                 if (set_acl_as_root) {
3920                         become_root();
3921                 }
3922                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3923                                          &fsp->fsp_name->st, &acl_set_support);
3924                 if (set_acl_as_root) {
3925                         unbecome_root();
3926                 }
3927                 if (acl_set_support && ret == false) {
3928                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3929                                  "%s (%s).\n", fsp_str_dbg(fsp),
3930                                  strerror(errno)));
3931                         free_canon_ace_list(file_ace_list);
3932                         free_canon_ace_list(dir_ace_list);
3933                         return map_nt_error_from_unix(errno);
3934                 }
3935         }
3936
3937         if (acl_perms && acl_set_support && fsp->is_directory) {
3938                 if (dir_ace_list) {
3939                         if (set_acl_as_root) {
3940                                 become_root();
3941                         }
3942                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
3943                                                  &fsp->fsp_name->st,
3944                                                  &acl_set_support);
3945                         if (set_acl_as_root) {
3946                                 unbecome_root();
3947                         }
3948                         if (ret == false) {
3949                                 DEBUG(3,("set_nt_acl: failed to set default "
3950                                          "acl on directory %s (%s).\n",
3951                                          fsp_str_dbg(fsp), strerror(errno)));
3952                                 free_canon_ace_list(file_ace_list);
3953                                 free_canon_ace_list(dir_ace_list);
3954                                 return map_nt_error_from_unix(errno);
3955                         }
3956                 } else {
3957                         int sret = -1;
3958
3959                         /*
3960                          * No default ACL - delete one if it exists.
3961                          */
3962
3963                         if (set_acl_as_root) {
3964                                 become_root();
3965                         }
3966                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3967                             fsp->fsp_name->base_name);
3968                         if (set_acl_as_root) {
3969                                 unbecome_root();
3970                         }
3971                         if (sret == -1) {
3972                                 if (acl_group_override(conn, fsp->fsp_name)) {
3973                                         DEBUG(5,("set_nt_acl: acl group "
3974                                                  "control on and current user "
3975                                                  "in file %s primary group. "
3976                                                  "Override delete_def_acl\n",
3977                                                  fsp_str_dbg(fsp)));
3978
3979                                         become_root();
3980                                         sret =
3981                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3982                                                     conn,
3983                                                     fsp->fsp_name->base_name);
3984                                         unbecome_root();
3985                                 }
3986
3987                                 if (sret == -1) {
3988                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3989                                         free_canon_ace_list(file_ace_list);
3990                                         free_canon_ace_list(dir_ace_list);
3991                                         return map_nt_error_from_unix(errno);
3992                                 }
3993                         }
3994                 }
3995         }
3996
3997         if (acl_set_support) {
3998                 if (set_acl_as_root) {
3999                         become_root();
4000                 }
4001                 store_inheritance_attributes(fsp,
4002                                 file_ace_list,
4003                                 dir_ace_list,
4004                                 psd->type);
4005                 if (set_acl_as_root) {
4006                         unbecome_root();
4007                 }
4008         }
4009
4010         /*
4011          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4012          */
4013
4014         if(!acl_set_support && acl_perms) {
4015                 mode_t posix_perms;
4016
4017                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4018                         free_canon_ace_list(file_ace_list);
4019                         free_canon_ace_list(dir_ace_list);
4020                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4021                                  "posix permissions for file %s.\n",
4022                                  fsp_str_dbg(fsp)));
4023                         return NT_STATUS_ACCESS_DENIED;
4024                 }
4025
4026                 if (orig_mode != posix_perms) {
4027                         int sret = -1;
4028
4029                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4030                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4031
4032                         if (set_acl_as_root) {
4033                                 become_root();
4034                         }
4035                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4036                                              posix_perms);
4037                         if (set_acl_as_root) {
4038                                 unbecome_root();
4039                         }
4040                         if(sret == -1) {
4041                                 if (acl_group_override(conn, fsp->fsp_name)) {
4042                                         DEBUG(5,("set_nt_acl: acl group "
4043                                                  "control on and current user "
4044                                                  "in file %s primary group. "
4045                                                  "Override chmod\n",
4046                                                  fsp_str_dbg(fsp)));
4047
4048                                         become_root();
4049                                         sret = SMB_VFS_CHMOD(conn,
4050                                             fsp->fsp_name->base_name,
4051                                             posix_perms);
4052                                         unbecome_root();
4053                                 }
4054
4055                                 if (sret == -1) {
4056                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4057                                                  "failed. Error = %s.\n",
4058                                                  fsp_str_dbg(fsp),
4059                                                  (unsigned int)posix_perms,
4060                                                  strerror(errno)));
4061                                         free_canon_ace_list(file_ace_list);
4062                                         free_canon_ace_list(dir_ace_list);
4063                                         return map_nt_error_from_unix(errno);
4064                                 }
4065                         }
4066                 }
4067         }
4068
4069         free_canon_ace_list(file_ace_list);
4070         free_canon_ace_list(dir_ace_list);
4071
4072         /* Ensure the stat struct in the fsp is correct. */
4073         status = vfs_stat_fsp(fsp);
4074
4075         return NT_STATUS_OK;
4076 }
4077
4078 /****************************************************************************
4079  Get the actual group bits stored on a file with an ACL. Has no effect if
4080  the file has no ACL. Needed in dosmode code where the stat() will return
4081  the mask bits, not the real group bits, for a file with an ACL.
4082 ****************************************************************************/
4083
4084 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4085 {
4086         int entry_id = SMB_ACL_FIRST_ENTRY;
4087         SMB_ACL_ENTRY_T entry;
4088         SMB_ACL_T posix_acl;
4089         int result = -1;
4090
4091         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4092         if (posix_acl == (SMB_ACL_T)NULL)
4093                 return -1;
4094
4095         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4096                 SMB_ACL_TAG_T tagtype;
4097                 SMB_ACL_PERMSET_T permset;
4098
4099                 entry_id = SMB_ACL_NEXT_ENTRY;
4100
4101                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4102                         break;
4103
4104                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4105                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4106                                 break;
4107                         } else {
4108                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4109                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4110                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4111                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4112                                 result = 0;
4113                                 break;
4114                         }
4115                 }
4116         }
4117         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4118         return result;
4119 }
4120
4121 /****************************************************************************
4122  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4123  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4124 ****************************************************************************/
4125
4126 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4127 {
4128         int entry_id = SMB_ACL_FIRST_ENTRY;
4129         SMB_ACL_ENTRY_T entry;
4130         int num_entries = 0;
4131
4132         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4133                 SMB_ACL_TAG_T tagtype;
4134                 SMB_ACL_PERMSET_T permset;
4135                 mode_t perms;
4136
4137                 entry_id = SMB_ACL_NEXT_ENTRY;
4138
4139                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4140                         return -1;
4141
4142                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4143                         return -1;
4144
4145                 num_entries++;
4146
4147                 switch(tagtype) {
4148                         case SMB_ACL_USER_OBJ:
4149                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4150                                 break;
4151                         case SMB_ACL_GROUP_OBJ:
4152                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4153                                 break;
4154                         case SMB_ACL_MASK:
4155                                 /*
4156                                  * FIXME: The ACL_MASK entry permissions should really be set to
4157                                  * the union of the permissions of all ACL_USER,
4158                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4159                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4160                                  */
4161                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4162                                 break;
4163                         case SMB_ACL_OTHER:
4164                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4165                                 break;
4166                         default:
4167                                 continue;
4168                 }
4169
4170                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4171                         return -1;
4172
4173                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4174                         return -1;
4175         }
4176
4177         /*
4178          * If this is a simple 3 element ACL or no elements then it's a standard
4179          * UNIX permission set. Just use chmod...
4180          */
4181
4182         if ((num_entries == 3) || (num_entries == 0))
4183                 return -1;
4184
4185         return 0;
4186 }
4187
4188 /****************************************************************************
4189  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4190  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4191  resulting ACL on TO.  Note that name is in UNIX character set.
4192 ****************************************************************************/
4193
4194 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4195 {
4196         SMB_ACL_T posix_acl = NULL;
4197         int ret = -1;
4198
4199         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4200                 return -1;
4201
4202         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4203                 goto done;
4204
4205         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4206
4207  done:
4208
4209         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4210         return ret;
4211 }
4212
4213 /****************************************************************************
4214  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4215  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4216  Note that name is in UNIX character set.
4217 ****************************************************************************/
4218
4219 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4220 {
4221         return copy_access_posix_acl(conn, name, name, mode);
4222 }
4223
4224 /****************************************************************************
4225  Check for an existing default POSIX ACL on a directory.
4226 ****************************************************************************/
4227
4228 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4229 {
4230         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4231         bool has_acl = False;
4232         SMB_ACL_ENTRY_T entry;
4233
4234         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4235                 has_acl = True;
4236         }
4237
4238         if (def_acl) {
4239                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4240         }
4241         return has_acl;
4242 }
4243
4244 /****************************************************************************
4245  If the parent directory has no default ACL but it does have an Access ACL,
4246  inherit this Access ACL to file name.
4247 ****************************************************************************/
4248
4249 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4250                        const char *name, mode_t mode)
4251 {
4252         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4253                 return 0;
4254
4255         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4256 }
4257
4258 /****************************************************************************
4259  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4260  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4261 ****************************************************************************/
4262
4263 int fchmod_acl(files_struct *fsp, mode_t mode)
4264 {
4265         connection_struct *conn = fsp->conn;
4266         SMB_ACL_T posix_acl = NULL;
4267         int ret = -1;
4268
4269         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4270                 return -1;
4271
4272         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4273                 goto done;
4274
4275         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4276
4277   done:
4278
4279         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4280         return ret;
4281 }
4282
4283 /****************************************************************************
4284  Map from wire type to permset.
4285 ****************************************************************************/
4286
4287 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4288 {
4289         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4290                 return False;
4291         }
4292
4293         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4294                 return False;
4295         }
4296
4297         if (wire_perm & SMB_POSIX_ACL_READ) {
4298                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4299                         return False;
4300                 }
4301         }
4302         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4303                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4304                         return False;
4305                 }
4306         }
4307         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4308                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4309                         return False;
4310                 }
4311         }
4312         return True;
4313 }
4314
4315 /****************************************************************************
4316  Map from wire type to tagtype.
4317 ****************************************************************************/
4318
4319 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4320 {
4321         switch (wire_tt) {
4322                 case SMB_POSIX_ACL_USER_OBJ:
4323                         *p_tt = SMB_ACL_USER_OBJ;
4324                         break;
4325                 case SMB_POSIX_ACL_USER:
4326                         *p_tt = SMB_ACL_USER;
4327                         break;
4328                 case SMB_POSIX_ACL_GROUP_OBJ:
4329                         *p_tt = SMB_ACL_GROUP_OBJ;
4330                         break;
4331                 case SMB_POSIX_ACL_GROUP:
4332                         *p_tt = SMB_ACL_GROUP;
4333                         break;
4334                 case SMB_POSIX_ACL_MASK:
4335                         *p_tt = SMB_ACL_MASK;
4336                         break;
4337                 case SMB_POSIX_ACL_OTHER:
4338                         *p_tt = SMB_ACL_OTHER;
4339                         break;
4340                 default:
4341                         return False;
4342         }
4343         return True;
4344 }
4345
4346 /****************************************************************************
4347  Create a new POSIX acl from wire permissions.
4348  FIXME ! How does the share mask/mode fit into this.... ?
4349 ****************************************************************************/
4350
4351 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4352 {
4353         unsigned int i;
4354         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4355
4356         if (the_acl == NULL) {
4357                 return NULL;
4358         }
4359
4360         for (i = 0; i < num_acls; i++) {
4361                 SMB_ACL_ENTRY_T the_entry;
4362                 SMB_ACL_PERMSET_T the_permset;
4363                 SMB_ACL_TAG_T tag_type;
4364
4365                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4366                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4367                                 i, strerror(errno) ));
4368                         goto fail;
4369                 }
4370
4371                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4372                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4373                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4374                         goto fail;
4375                 }
4376
4377                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4378                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4379                                 i, strerror(errno) ));
4380                         goto fail;
4381                 }
4382
4383                 /* Get the permset pointer from the new ACL entry. */
4384                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4385                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4386                                 i, strerror(errno) ));
4387                         goto fail;
4388                 }
4389
4390                 /* Map from wire to permissions. */
4391                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4392                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4393                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4394                         goto fail;
4395                 }
4396
4397                 /* Now apply to the new ACL entry. */
4398                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4399                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4400                                 i, strerror(errno) ));
4401                         goto fail;
4402                 }
4403
4404                 if (tag_type == SMB_ACL_USER) {
4405                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4406                         uid_t uid = (uid_t)uidval;
4407                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4408                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4409                                         (unsigned int)uid, i, strerror(errno) ));
4410                                 goto fail;
4411                         }
4412                 }
4413
4414                 if (tag_type == SMB_ACL_GROUP) {
4415                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4416                         gid_t gid = (uid_t)gidval;
4417                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4418                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4419                                         (unsigned int)gid, i, strerror(errno) ));
4420                                 goto fail;
4421                         }
4422                 }
4423         }
4424
4425         return the_acl;
4426
4427  fail:
4428
4429         if (the_acl != NULL) {
4430                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4431         }
4432         return NULL;
4433 }
4434
4435 /****************************************************************************
4436  Calls from UNIX extensions - Default POSIX ACL set.
4437  If num_def_acls == 0 and not a directory just return. If it is a directory
4438  and num_def_acls == 0 then remove the default acl. Else set the default acl
4439  on the directory.
4440 ****************************************************************************/
4441
4442 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4443                                 uint16 num_def_acls, const char *pdata)
4444 {
4445         SMB_ACL_T def_acl = NULL;
4446
4447         if (!S_ISDIR(psbuf->st_ex_mode)) {
4448                 if (num_def_acls) {
4449                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4450                         errno = EISDIR;
4451                         return False;
4452                 } else {
4453                         return True;
4454                 }
4455         }
4456
4457         if (!num_def_acls) {
4458                 /* Remove the default ACL. */
4459                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4460                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4461                                 fname, strerror(errno) ));
4462                         return False;
4463                 }
4464                 return True;
4465         }
4466
4467         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4468                 return False;
4469         }
4470
4471         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4472                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4473                         fname, strerror(errno) ));
4474                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4475                 return False;
4476         }
4477
4478         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4479         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4480         return True;
4481 }
4482
4483 /****************************************************************************
4484  Remove an ACL from a file. As we don't have acl_delete_entry() available
4485  we must read the current acl and copy all entries except MASK, USER and GROUP
4486  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4487  removed.
4488  FIXME ! How does the share mask/mode fit into this.... ?
4489 ****************************************************************************/
4490
4491 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4492 {
4493         SMB_ACL_T file_acl = NULL;
4494         int entry_id = SMB_ACL_FIRST_ENTRY;
4495         SMB_ACL_ENTRY_T entry;
4496         bool ret = False;
4497         /* Create a new ACL with only 3 entries, u/g/w. */
4498         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4499         SMB_ACL_ENTRY_T user_ent = NULL;
4500         SMB_ACL_ENTRY_T group_ent = NULL;
4501         SMB_ACL_ENTRY_T other_ent = NULL;
4502
4503         if (new_file_acl == NULL) {
4504                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4505                 return False;
4506         }
4507
4508         /* Now create the u/g/w entries. */
4509         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4510                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4511                         fname, strerror(errno) ));
4512                 goto done;
4513         }
4514         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4515                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4516                         fname, strerror(errno) ));
4517                 goto done;
4518         }
4519
4520         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4521                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4522                         fname, strerror(errno) ));
4523                 goto done;
4524         }
4525         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4526                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4527                         fname, strerror(errno) ));
4528                 goto done;
4529         }
4530
4531         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4532                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4533                         fname, strerror(errno) ));
4534                 goto done;
4535         }
4536         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4537                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4538                         fname, strerror(errno) ));
4539                 goto done;
4540         }
4541
4542         /* Get the current file ACL. */
4543         if (fsp && fsp->fh->fd != -1) {
4544                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4545         } else {
4546                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4547         }
4548
4549         if (file_acl == NULL) {
4550                 /* This is only returned if an error occurred. Even for a file with
4551                    no acl a u/g/w acl should be returned. */
4552                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4553                         fname, strerror(errno) ));
4554                 goto done;
4555         }
4556
4557         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4558                 SMB_ACL_TAG_T tagtype;
4559                 SMB_ACL_PERMSET_T permset;
4560
4561                 entry_id = SMB_ACL_NEXT_ENTRY;
4562
4563                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4564                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4565                                 fname, strerror(errno) ));
4566                         goto done;
4567                 }
4568
4569                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4570                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4571                                 fname, strerror(errno) ));
4572                         goto done;
4573                 }
4574
4575                 if (tagtype == SMB_ACL_USER_OBJ) {
4576                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4577                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4578                                         fname, strerror(errno) ));
4579                         }
4580                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4581                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4582                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4583                                         fname, strerror(errno) ));
4584                         }
4585                 } else if (tagtype == SMB_ACL_OTHER) {
4586                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4587                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4588                                         fname, strerror(errno) ));
4589                         }
4590                 }
4591         }
4592
4593         /* Set the new empty file ACL. */
4594         if (fsp && fsp->fh->fd != -1) {
4595                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4596                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4597                                 fname, strerror(errno) ));
4598                         goto done;
4599                 }
4600         } else {
4601                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4602                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4603                                 fname, strerror(errno) ));
4604                         goto done;
4605                 }
4606         }
4607
4608         ret = True;
4609
4610  done:
4611
4612         if (file_acl) {
4613                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4614         }
4615         if (new_file_acl) {
4616                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4617         }
4618         return ret;
4619 }
4620
4621 /****************************************************************************
4622  Calls from UNIX extensions - POSIX ACL set.
4623  If num_def_acls == 0 then read/modify/write acl after removing all entries
4624  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4625 ****************************************************************************/
4626
4627 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4628 {
4629         SMB_ACL_T file_acl = NULL;
4630
4631         if (!num_acls) {
4632                 /* Remove the ACL from the file. */
4633                 return remove_posix_acl(conn, fsp, fname);
4634         }
4635
4636         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4637                 return False;
4638         }
4639
4640         if (fsp && fsp->fh->fd != -1) {
4641                 /* The preferred way - use an open fd. */
4642                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4643                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4644                                 fname, strerror(errno) ));
4645                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4646                         return False;
4647                 }
4648         } else {
4649                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4650                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4651                                 fname, strerror(errno) ));
4652                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4653                         return False;
4654                 }
4655         }
4656
4657         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4658         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4659         return True;
4660 }
4661
4662 /********************************************************************
4663  Pull the NT ACL from a file on disk or the OpenEventlog() access
4664  check.  Caller is responsible for freeing the returned security
4665  descriptor via TALLOC_FREE().  This is designed for dealing with
4666  user space access checks in smbd outside of the VFS.  For example,
4667  checking access rights in OpenEventlog().
4668
4669  Assume we are dealing with files (for now)
4670 ********************************************************************/
4671
4672 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4673 {
4674         SEC_DESC *psd, *ret_sd;
4675         connection_struct *conn;
4676         files_struct finfo;
4677         struct fd_handle fh;
4678         NTSTATUS status;
4679
4680         conn = TALLOC_ZERO_P(ctx, connection_struct);
4681         if (conn == NULL) {
4682                 DEBUG(0, ("talloc failed\n"));
4683                 return NULL;
4684         }
4685
4686         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4687                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4688                 TALLOC_FREE(conn);
4689                 return NULL;
4690         }
4691
4692         conn->params->service = -1;
4693
4694         set_conn_connectpath(conn, "/");
4695
4696         if (!smbd_vfs_init(conn)) {
4697                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4698                 conn_free(conn);
4699                 return NULL;
4700         }
4701
4702         ZERO_STRUCT( finfo );
4703         ZERO_STRUCT( fh );
4704
4705         finfo.fnum = -1;
4706         finfo.conn = conn;
4707         finfo.fh = &fh;
4708         finfo.fh->fd = -1;
4709
4710         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4711                                             &finfo.fsp_name);
4712         if (!NT_STATUS_IS_OK(status)) {
4713                 conn_free(conn);
4714                 return NULL;
4715         }
4716
4717         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4718                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4719                 TALLOC_FREE(finfo.fsp_name);
4720                 conn_free(conn);
4721                 return NULL;
4722         }
4723
4724         ret_sd = dup_sec_desc( ctx, psd );
4725
4726         TALLOC_FREE(finfo.fsp_name);
4727         conn_free(conn);
4728
4729         return ret_sd;
4730 }
4731
4732 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4733
4734 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4735                                         const char *name,
4736                                         SMB_STRUCT_STAT *psbuf,
4737                                         SEC_DESC **ppdesc)
4738 {
4739         struct dom_sid owner_sid, group_sid;
4740         size_t size = 0;
4741         SEC_ACE aces[4];
4742         uint32_t access_mask = 0;
4743         mode_t mode = psbuf->st_ex_mode;
4744         SEC_ACL *new_dacl = NULL;
4745         int idx = 0;
4746
4747         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4748                 name, (int)mode ));
4749
4750         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4751         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4752
4753         /*
4754          We provide up to 4 ACEs
4755                 - Owner
4756                 - Group
4757                 - Everyone
4758                 - NT System
4759         */
4760
4761         if (mode & S_IRUSR) {
4762                 if (mode & S_IWUSR) {
4763                         access_mask |= SEC_RIGHTS_FILE_ALL;
4764                 } else {
4765                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4766                 }
4767         }
4768         if (mode & S_IWUSR) {
4769                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4770         }
4771
4772         init_sec_ace(&aces[idx],
4773                         &owner_sid,
4774                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4775                         access_mask,
4776                         0);
4777         idx++;
4778
4779         access_mask = 0;
4780         if (mode & S_IRGRP) {
4781                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4782         }
4783         if (mode & S_IWGRP) {
4784                 /* note that delete is not granted - this matches posix behaviour */
4785                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4786         }
4787         if (access_mask) {
4788                 init_sec_ace(&aces[idx],
4789                         &group_sid,
4790                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4791                         access_mask,
4792                         0);
4793                 idx++;
4794         }
4795
4796         access_mask = 0;
4797         if (mode & S_IROTH) {
4798                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4799         }
4800         if (mode & S_IWOTH) {
4801                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4802         }
4803         if (access_mask) {
4804                 init_sec_ace(&aces[idx],
4805                         &global_sid_World,
4806                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4807                         access_mask,
4808                         0);
4809                 idx++;
4810         }
4811
4812         init_sec_ace(&aces[idx],
4813                         &global_sid_System,
4814                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4815                         SEC_RIGHTS_FILE_ALL,
4816                         0);
4817         idx++;
4818
4819         new_dacl = make_sec_acl(ctx,
4820                         NT4_ACL_REVISION,
4821                         idx,
4822                         aces);
4823
4824         if (!new_dacl) {
4825                 return NT_STATUS_NO_MEMORY;
4826         }
4827
4828         *ppdesc = make_sec_desc(ctx,
4829                         SECURITY_DESCRIPTOR_REVISION_1,
4830                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4831                         &owner_sid,
4832                         &group_sid,
4833                         NULL,
4834                         new_dacl,
4835                         &size);
4836         if (!*ppdesc) {
4837                 return NT_STATUS_NO_MEMORY;
4838         }
4839         return NT_STATUS_OK;
4840 }