source3/smbd/posix_acls.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB NT Security Descriptor / Unix permission conversion.
   4    Copyright (C) Jeremy Allison 1994-2009.
   5    Copyright (C) Andreas Gruenbacher 2002.
   6    Copyright (C) Simo Sorce <idra@samba.org> 2009.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "../libcli/security/security.h"
  24
  25 extern const struct generic_mapping file_generic_mapping;
  26
  27 #undef  DBGC_CLASS
  28 #define DBGC_CLASS DBGC_ACLS
  29
  30 /****************************************************************************
  31  Data structures representing the internal ACE format.
  32 ****************************************************************************/
  33
  34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  36
  37 typedef union posix_id {
  38                 uid_t uid;
  39                 gid_t gid;
  40                 int world;
  41 } posix_id;
  42
  43 typedef struct canon_ace {
  44         struct canon_ace *next, *prev;
  45         SMB_ACL_TAG_T type;
  46         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  47         struct dom_sid trustee;
  48         enum ace_owner owner_type;
  49         enum ace_attribute attr;
  50         posix_id unix_ug;
  51         uint8_t ace_flags; /* From windows ACE entry. */
  52 } canon_ace;
  53
  54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  55
  56 /*
  57  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  58  * attribute on disk - version 1.
  59  * All values are little endian.
  60  *
  61  * |  1   |  1   |   2         |         2           |  ....
  62  * +------+------+-------------+---------------------+-------------+--------------------+
  63  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  64  * +------+------+-------------+---------------------+-------------+--------------------+
  65  *
  66  * Entry format is :
  67  *
  68  * |  1   |       4           |
  69  * +------+-------------------+
  70  * | value|  uid/gid or world |
  71  * | type |  value            |
  72  * +------+-------------------+
  73  *
  74  * Version 2 format. Stores extra Windows metadata about an ACL.
  75  *
  76  * |  1   |  2       |   2         |         2           |  ....
  77  * +------+----------+-------------+---------------------+-------------+--------------------+
  78  * | vers | ace      | num_entries | num_default_entries | ..entries.. | default_entries... |
  79  * |   2  |  type    |             |                     |             |                    |
  80  * +------+----------+-------------+---------------------+-------------+--------------------+
  81  *
  82  * Entry format is :
  83  *
  84  * |  1   |  1   |       4           |
  85  * +------+------+-------------------+
  86  * | ace  | value|  uid/gid or world |
  87  * | flag | type |  value            |
  88  * +------+-------------------+------+
  89  *
  90  */
  91
  92 #define PAI_VERSION_OFFSET                      0
  93
  94 #define PAI_V1_FLAG_OFFSET                      1
  95 #define PAI_V1_NUM_ENTRIES_OFFSET               2
  96 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET       4
  97 #define PAI_V1_ENTRIES_BASE                     6
  98 #define PAI_V1_ACL_FLAG_PROTECTED               0x1
  99 #define PAI_V1_ENTRY_LENGTH                     5
 100
 101 #define PAI_V1_VERSION                          1
 102
 103 #define PAI_V2_TYPE_OFFSET                      1
 104 #define PAI_V2_NUM_ENTRIES_OFFSET               3
 105 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET       5
 106 #define PAI_V2_ENTRIES_BASE                     7
 107 #define PAI_V2_ENTRY_LENGTH                     6
 108
 109 #define PAI_V2_VERSION                          2
 110
 111 /*
 112  * In memory format of user.SAMBA_PAI attribute.
 113  */
 114
 115 struct pai_entry {
 116         struct pai_entry *next, *prev;
 117         uint8_t ace_flags;
 118         enum ace_owner owner_type;
 119         posix_id unix_ug;
 120 };
 121
 122 struct pai_val {
 123         uint16_t sd_type;
 124         unsigned int num_entries;
 125         struct pai_entry *entry_list;
 126         unsigned int num_def_entries;
 127         struct pai_entry *def_entry_list;
 128 };
 129
 130 /************************************************************************
 131  Return a uint32 of the pai_entry principal.
 132 ************************************************************************/
 133
 134 static uint32_t get_pai_entry_val(struct pai_entry *paie)
 135 {
 136         switch (paie->owner_type) {
 137                 case UID_ACE:
 138                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 139                         return (uint32_t)paie->unix_ug.uid;
 140                 case GID_ACE:
 141                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 142                         return (uint32_t)paie->unix_ug.gid;
 143                 case WORLD_ACE:
 144                 default:
 145                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 146                         return (uint32_t)-1;
 147         }
 148 }
 149
 150 /************************************************************************
 151  Return a uint32 of the entry principal.
 152 ************************************************************************/
 153
 154 static uint32_t get_entry_val(canon_ace *ace_entry)
 155 {
 156         switch (ace_entry->owner_type) {
 157                 case UID_ACE:
 158                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
 159                         return (uint32_t)ace_entry->unix_ug.uid;
 160                 case GID_ACE:
 161                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
 162                         return (uint32_t)ace_entry->unix_ug.gid;
 163                 case WORLD_ACE:
 164                 default:
 165                         DEBUG(10,("get_entry_val: world ace\n"));
 166                         return (uint32_t)-1;
 167         }
 168 }
 169
 170 /************************************************************************
 171  Create the on-disk format (always v2 now). Caller must free.
 172 ************************************************************************/
 173
 174 static char *create_pai_buf_v2(canon_ace *file_ace_list,
 175                                 canon_ace *dir_ace_list,
 176                                 uint16_t sd_type,
 177                                 size_t *store_size)
 178 {
 179         char *pai_buf = NULL;
 180         canon_ace *ace_list = NULL;
 181         char *entry_offset = NULL;
 182         unsigned int num_entries = 0;
 183         unsigned int num_def_entries = 0;
 184         unsigned int i;
 185
 186         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 187                 num_entries++;
 188         }
 189
 190         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 191                 num_def_entries++;
 192         }
 193
 194         DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 195
 196         *store_size = PAI_V2_ENTRIES_BASE +
 197                 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
 198
 199         pai_buf = (char *)SMB_MALLOC(*store_size);
 200         if (!pai_buf) {
 201                 return NULL;
 202         }
 203
 204         /* Set up the header. */
 205         memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
 206         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
 207         SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
 208         SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
 209         SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 210
 211         DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
 212                         (unsigned int)sd_type ));
 213
 214         entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
 215
 216         i = 0;
 217         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 218                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 219                 uint32_t entry_val = get_entry_val(ace_list);
 220
 221                 SCVAL(entry_offset,0,ace_list->ace_flags);
 222                 SCVAL(entry_offset,1,type_val);
 223                 SIVAL(entry_offset,2,entry_val);
 224                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 225                         i,
 226                         (unsigned int)ace_list->ace_flags,
 227                         (unsigned int)type_val,
 228                         (unsigned int)entry_val ));
 229                 i++;
 230                 entry_offset += PAI_V2_ENTRY_LENGTH;
 231         }
 232
 233         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 234                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 235                 uint32_t entry_val = get_entry_val(ace_list);
 236
 237                 SCVAL(entry_offset,0,ace_list->ace_flags);
 238                 SCVAL(entry_offset,1,type_val);
 239                 SIVAL(entry_offset,2,entry_val);
 240                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 241                         i,
 242                         (unsigned int)ace_list->ace_flags,
 243                         (unsigned int)type_val,
 244                         (unsigned int)entry_val ));
 245                 i++;
 246                 entry_offset += PAI_V2_ENTRY_LENGTH;
 247         }
 248
 249         return pai_buf;
 250 }
 251
 252 /************************************************************************
 253  Store the user.SAMBA_PAI attribute on disk.
 254 ************************************************************************/
 255
 256 static void store_inheritance_attributes(files_struct *fsp,
 257                                         canon_ace *file_ace_list,
 258                                         canon_ace *dir_ace_list,
 259                                         uint16_t sd_type)
 260 {
 261         int ret;
 262         size_t store_size;
 263         char *pai_buf;
 264
 265         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 266                 return;
 267         }
 268
 269         pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
 270                                 sd_type, &store_size);
 271
 272         if (fsp->fh->fd != -1) {
 273                 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 274                                 pai_buf, store_size, 0);
 275         } else {
 276                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
 277                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 278                                        pai_buf, store_size, 0);
 279         }
 280
 281         SAFE_FREE(pai_buf);
 282
 283         DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
 284                 (unsigned int)sd_type,
 285                 fsp_str_dbg(fsp)));
 286
 287         if (ret == -1 && !no_acl_syscall_error(errno)) {
 288                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 289         }
 290 }
 291
 292 /************************************************************************
 293  Delete the in memory inheritance info.
 294 ************************************************************************/
 295
 296 static void free_inherited_info(struct pai_val *pal)
 297 {
 298         if (pal) {
 299                 struct pai_entry *paie, *paie_next;
 300                 for (paie = pal->entry_list; paie; paie = paie_next) {
 301                         paie_next = paie->next;
 302                         SAFE_FREE(paie);
 303                 }
 304                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 305                         paie_next = paie->next;
 306                         SAFE_FREE(paie);
 307                 }
 308                 SAFE_FREE(pal);
 309         }
 310 }
 311
 312 /************************************************************************
 313  Get any stored ACE flags.
 314 ************************************************************************/
 315
 316 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
 317 {
 318         struct pai_entry *paie;
 319
 320         if (!pal) {
 321                 return 0;
 322         }
 323
 324         /* If the entry exists it is inherited. */
 325         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 326                 if (ace_entry->owner_type == paie->owner_type &&
 327                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 328                         return paie->ace_flags;
 329         }
 330         return 0;
 331 }
 332
 333 /************************************************************************
 334  Ensure an attribute just read is valid - v1.
 335 ************************************************************************/
 336
 337 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
 338 {
 339         uint16 num_entries;
 340         uint16 num_def_entries;
 341
 342         if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
 343                 /* Corrupted - too small. */
 344                 return false;
 345         }
 346
 347         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
 348                 return false;
 349         }
 350
 351         num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
 352         num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 353
 354         /* Check the entry lists match. */
 355         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 356
 357         if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
 358                         PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
 359                 return false;
 360         }
 361
 362         return true;
 363 }
 364
 365 /************************************************************************
 366  Ensure an attribute just read is valid - v2.
 367 ************************************************************************/
 368
 369 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
 370 {
 371         uint16 num_entries;
 372         uint16 num_def_entries;
 373
 374         if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
 375                 /* Corrupted - too small. */
 376                 return false;
 377         }
 378
 379         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
 380                 return false;
 381         }
 382
 383         num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
 384         num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 385
 386         /* Check the entry lists match. */
 387         /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
 388
 389         if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
 390                         PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
 391                 return false;
 392         }
 393
 394         return true;
 395 }
 396
 397 /************************************************************************
 398  Decode the owner.
 399 ************************************************************************/
 400
 401 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
 402 {
 403         paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 404         switch( paie->owner_type) {
 405                 case UID_ACE:
 406                         paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 407                         DEBUG(10,("get_pai_owner_type: uid = %u\n",
 408                                 (unsigned int)paie->unix_ug.uid ));
 409                         break;
 410                 case GID_ACE:
 411                         paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 412                         DEBUG(10,("get_pai_owner_type: gid = %u\n",
 413                                 (unsigned int)paie->unix_ug.gid ));
 414                         break;
 415                 case WORLD_ACE:
 416                         paie->unix_ug.world = -1;
 417                         DEBUG(10,("get_pai_owner_type: world ace\n"));
 418                         break;
 419                 default:
 420                         DEBUG(10,("get_pai_owner_type: unknown type %u\n",
 421                                 (unsigned int)paie->owner_type ));
 422                         return false;
 423         }
 424         return true;
 425 }
 426
 427 /************************************************************************
 428  Process v2 entries.
 429 ************************************************************************/
 430
 431 static const char *create_pai_v1_entries(struct pai_val *paiv,
 432                                 const char *entry_offset,
 433                                 bool def_entry)
 434 {
 435         int i;
 436
 437         for (i = 0; i < paiv->num_entries; i++) {
 438                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 439                 if (!paie) {
 440                         return NULL;
 441                 }
 442
 443                 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
 444                 if (!get_pai_owner_type(paie, entry_offset)) {
 445                         return NULL;
 446                 }
 447
 448                 if (!def_entry) {
 449                         DLIST_ADD(paiv->entry_list, paie);
 450                 } else {
 451                         DLIST_ADD(paiv->def_entry_list, paie);
 452                 }
 453                 entry_offset += PAI_V1_ENTRY_LENGTH;
 454         }
 455         return entry_offset;
 456 }
 457
 458 /************************************************************************
 459  Convert to in-memory format from version 1.
 460 ************************************************************************/
 461
 462 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
 463 {
 464         const char *entry_offset;
 465         struct pai_val *paiv = NULL;
 466
 467         if (!check_pai_ok_v1(buf, size)) {
 468                 return NULL;
 469         }
 470
 471         paiv = SMB_MALLOC_P(struct pai_val);
 472         if (!paiv) {
 473                 return NULL;
 474         }
 475
 476         memset(paiv, '\0', sizeof(struct pai_val));
 477
 478         paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
 479                         SEC_DESC_DACL_PROTECTED : 0;
 480
 481         paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
 482         paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 483
 484         entry_offset = buf + PAI_V1_ENTRIES_BASE;
 485
 486         DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
 487                         paiv->num_entries, paiv->num_def_entries ));
 488
 489         entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
 490         if (entry_offset == NULL) {
 491                 free_inherited_info(paiv);
 492                 return NULL;
 493         }
 494         entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
 495         if (entry_offset == NULL) {
 496                 free_inherited_info(paiv);
 497                 return NULL;
 498         }
 499
 500         return paiv;
 501 }
 502
 503 /************************************************************************
 504  Process v2 entries.
 505 ************************************************************************/
 506
 507 static const char *create_pai_v2_entries(struct pai_val *paiv,
 508                                 unsigned int num_entries,
 509                                 const char *entry_offset,
 510                                 bool def_entry)
 511 {
 512         unsigned int i;
 513
 514         for (i = 0; i < num_entries; i++) {
 515                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 516                 if (!paie) {
 517                         return NULL;
 518                 }
 519
 520                 paie->ace_flags = CVAL(entry_offset,0);
 521
 522                 if (!get_pai_owner_type(paie, entry_offset+1)) {
 523                         SAFE_FREE(paie);
 524                         return NULL;
 525                 }
 526                 if (!def_entry) {
 527                         DLIST_ADD(paiv->entry_list, paie);
 528                 } else {
 529                         DLIST_ADD(paiv->def_entry_list, paie);
 530                 }
 531                 entry_offset += PAI_V2_ENTRY_LENGTH;
 532         }
 533         return entry_offset;
 534 }
 535
 536 /************************************************************************
 537  Convert to in-memory format from version 2.
 538 ************************************************************************/
 539
 540 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
 541 {
 542         const char *entry_offset;
 543         struct pai_val *paiv = NULL;
 544
 545         if (!check_pai_ok_v2(buf, size)) {
 546                 return NULL;
 547         }
 548
 549         paiv = SMB_MALLOC_P(struct pai_val);
 550         if (!paiv) {
 551                 return NULL;
 552         }
 553
 554         memset(paiv, '\0', sizeof(struct pai_val));
 555
 556         paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
 557
 558         paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
 559         paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 560
 561         entry_offset = buf + PAI_V2_ENTRIES_BASE;
 562
 563         DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
 564                         (unsigned int)paiv->sd_type,
 565                         paiv->num_entries, paiv->num_def_entries ));
 566
 567         entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
 568                                 entry_offset, false);
 569         if (entry_offset == NULL) {
 570                 free_inherited_info(paiv);
 571                 return NULL;
 572         }
 573         entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
 574                                 entry_offset, true);
 575         if (entry_offset == NULL) {
 576                 free_inherited_info(paiv);
 577                 return NULL;
 578         }
 579
 580         return paiv;
 581 }
 582
 583 /************************************************************************
 584  Convert to in-memory format - from either version 1 or 2.
 585 ************************************************************************/
 586
 587 static struct pai_val *create_pai_val(const char *buf, size_t size)
 588 {
 589         if (size < 1) {
 590                 return NULL;
 591         }
 592         if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
 593                 return create_pai_val_v1(buf, size);
 594         } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
 595                 return create_pai_val_v2(buf, size);
 596         } else {
 597                 return NULL;
 598         }
 599 }
 600
 601 /************************************************************************
 602  Load the user.SAMBA_PAI attribute.
 603 ************************************************************************/
 604
 605 static struct pai_val *fload_inherited_info(files_struct *fsp)
 606 {
 607         char *pai_buf;
 608         size_t pai_buf_size = 1024;
 609         struct pai_val *paiv = NULL;
 610         ssize_t ret;
 611
 612         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 613                 return NULL;
 614         }
 615
 616         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 617                 return NULL;
 618         }
 619
 620         do {
 621                 if (fsp->fh->fd != -1) {
 622                         ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 623                                         pai_buf, pai_buf_size);
 624                 } else {
 625                         ret = SMB_VFS_GETXATTR(fsp->conn,
 626                                                fsp->fsp_name->base_name,
 627                                                SAMBA_POSIX_INHERITANCE_EA_NAME,
 628                                                pai_buf, pai_buf_size);
 629                 }
 630
 631                 if (ret == -1) {
 632                         if (errno != ERANGE) {
 633                                 break;
 634                         }
 635                         /* Buffer too small - enlarge it. */
 636                         pai_buf_size *= 2;
 637                         SAFE_FREE(pai_buf);
 638                         if (pai_buf_size > 1024*1024) {
 639                                 return NULL; /* Limit malloc to 1mb. */
 640                         }
 641                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 642                                 return NULL;
 643                 }
 644         } while (ret == -1);
 645
 646         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
 647                   (unsigned long)ret, fsp_str_dbg(fsp)));
 648
 649         if (ret == -1) {
 650                 /* No attribute or not supported. */
 651 #if defined(ENOATTR)
 652                 if (errno != ENOATTR)
 653                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 654 #else
 655                 if (errno != ENOSYS)
 656                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 657 #endif
 658                 SAFE_FREE(pai_buf);
 659                 return NULL;
 660         }
 661
 662         paiv = create_pai_val(pai_buf, ret);
 663
 664         if (paiv) {
 665                 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
 666                           (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
 667         }
 668
 669         SAFE_FREE(pai_buf);
 670         return paiv;
 671 }
 672
 673 /************************************************************************
 674  Load the user.SAMBA_PAI attribute.
 675 ************************************************************************/
 676
 677 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
 678                                            const char *fname)
 679 {
 680         char *pai_buf;
 681         size_t pai_buf_size = 1024;
 682         struct pai_val *paiv = NULL;
 683         ssize_t ret;
 684
 685         if (!lp_map_acl_inherit(SNUM(conn))) {
 686                 return NULL;
 687         }
 688
 689         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 690                 return NULL;
 691         }
 692
 693         do {
 694                 ret = SMB_VFS_GETXATTR(conn, fname,
 695                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 696                                        pai_buf, pai_buf_size);
 697
 698                 if (ret == -1) {
 699                         if (errno != ERANGE) {
 700                                 break;
 701                         }
 702                         /* Buffer too small - enlarge it. */
 703                         pai_buf_size *= 2;
 704                         SAFE_FREE(pai_buf);
 705                         if (pai_buf_size > 1024*1024) {
 706                                 return NULL; /* Limit malloc to 1mb. */
 707                         }
 708                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 709                                 return NULL;
 710                 }
 711         } while (ret == -1);
 712
 713         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
 714
 715         if (ret == -1) {
 716                 /* No attribute or not supported. */
 717 #if defined(ENOATTR)
 718                 if (errno != ENOATTR)
 719                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 720 #else
 721                 if (errno != ENOSYS)
 722                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 723 #endif
 724                 SAFE_FREE(pai_buf);
 725                 return NULL;
 726         }
 727
 728         paiv = create_pai_val(pai_buf, ret);
 729
 730         if (paiv) {
 731                 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
 732                         (unsigned int)paiv->sd_type,
 733                         fname));
 734         }
 735
 736         SAFE_FREE(pai_buf);
 737         return paiv;
 738 }
 739
 740 /****************************************************************************
 741  Functions to manipulate the internal ACE format.
 742 ****************************************************************************/
 743
 744 /****************************************************************************
 745  Count a linked list of canonical ACE entries.
 746 ****************************************************************************/
 747
 748 static size_t count_canon_ace_list( canon_ace *l_head )
 749 {
 750         size_t count = 0;
 751         canon_ace *ace;
 752
 753         for (ace = l_head; ace; ace = ace->next)
 754                 count++;
 755
 756         return count;
 757 }
 758
 759 /****************************************************************************
 760  Free a linked list of canonical ACE entries.
 761 ****************************************************************************/
 762
 763 static void free_canon_ace_list( canon_ace *l_head )
 764 {
 765         canon_ace *list, *next;
 766
 767         for (list = l_head; list; list = next) {
 768                 next = list->next;
 769                 DLIST_REMOVE(l_head, list);
 770                 SAFE_FREE(list);
 771         }
 772 }
 773
 774 /****************************************************************************
 775  Function to duplicate a canon_ace entry.
 776 ****************************************************************************/
 777
 778 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 779 {
 780         canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
 781
 782         if (dst_ace == NULL)
 783                 return NULL;
 784
 785         *dst_ace = *src_ace;
 786         dst_ace->prev = dst_ace->next = NULL;
 787         return dst_ace;
 788 }
 789
 790 /****************************************************************************
 791  Print out a canon ace.
 792 ****************************************************************************/
 793
 794 static void print_canon_ace(canon_ace *pace, int num)
 795 {
 796         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 797         dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
 798         if (pace->owner_type == UID_ACE) {
 799                 const char *u_name = uidtoname(pace->unix_ug.uid);
 800                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
 801         } else if (pace->owner_type == GID_ACE) {
 802                 char *g_name = gidtoname(pace->unix_ug.gid);
 803                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
 804         } else
 805                 dbgtext( "other ");
 806         switch (pace->type) {
 807                 case SMB_ACL_USER:
 808                         dbgtext( "SMB_ACL_USER ");
 809                         break;
 810                 case SMB_ACL_USER_OBJ:
 811                         dbgtext( "SMB_ACL_USER_OBJ ");
 812                         break;
 813                 case SMB_ACL_GROUP:
 814                         dbgtext( "SMB_ACL_GROUP ");
 815                         break;
 816                 case SMB_ACL_GROUP_OBJ:
 817                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 818                         break;
 819                 case SMB_ACL_OTHER:
 820                         dbgtext( "SMB_ACL_OTHER ");
 821                         break;
 822                 default:
 823                         dbgtext( "MASK " );
 824                         break;
 825         }
 826
 827         dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
 828         dbgtext( "perms ");
 829         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 830         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 831         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 832 }
 833
 834 /****************************************************************************
 835  Print out a canon ace list.
 836 ****************************************************************************/
 837
 838 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 839 {
 840         int count = 0;
 841
 842         if( DEBUGLVL( 10 )) {
 843                 dbgtext( "print_canon_ace_list: %s\n", name );
 844                 for (;ace_list; ace_list = ace_list->next, count++)
 845                         print_canon_ace(ace_list, count );
 846         }
 847 }
 848
 849 /****************************************************************************
 850  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 851 ****************************************************************************/
 852
 853 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
 854 {
 855         mode_t ret = 0;
 856
 857         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
 858         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 859         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 860
 861         return ret;
 862 }
 863
 864 /****************************************************************************
 865  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 866 ****************************************************************************/
 867
 868 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 869 {
 870         mode_t ret = 0;
 871
 872         if (mode & r_mask)
 873                 ret |= S_IRUSR;
 874         if (mode & w_mask)
 875                 ret |= S_IWUSR;
 876         if (mode & x_mask)
 877                 ret |= S_IXUSR;
 878
 879         return ret;
 880 }
 881
 882 /****************************************************************************
 883  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 884  an SMB_ACL_PERMSET_T.
 885 ****************************************************************************/
 886
 887 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 888 {
 889         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1)
 890                 return -1;
 891         if (mode & S_IRUSR) {
 892                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
 893                         return -1;
 894         }
 895         if (mode & S_IWUSR) {
 896                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
 897                         return -1;
 898         }
 899         if (mode & S_IXUSR) {
 900                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
 901                         return -1;
 902         }
 903         return 0;
 904 }
 905
 906 /****************************************************************************
 907  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 908 ****************************************************************************/
 909
 910 void create_file_sids(const SMB_STRUCT_STAT *psbuf, struct dom_sid *powner_sid, struct dom_sid *pgroup_sid)
 911 {
 912         uid_to_sid( powner_sid, psbuf->st_ex_uid );
 913         gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
 914 }
 915
 916 /****************************************************************************
 917  Merge aces with a common sid - if both are allow or deny, OR the permissions together and
 918  delete the second one. If the first is deny, mask the permissions off and delete the allow
 919  if the permissions become zero, delete the deny if the permissions are non zero.
 920 ****************************************************************************/
 921
 922 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
 923 {
 924         canon_ace *l_head = *pp_list_head;
 925         canon_ace *curr_ace_outer;
 926         canon_ace *curr_ace_outer_next;
 927
 928         /*
 929          * First, merge allow entries with identical SIDs, and deny entries
 930          * with identical SIDs.
 931          */
 932
 933         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 934                 canon_ace *curr_ace;
 935                 canon_ace *curr_ace_next;
 936
 937                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 938
 939                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 940                         bool can_merge = false;
 941
 942                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 943
 944                         /* For file ACLs we can merge if the SIDs and ALLOW/DENY
 945                          * types are the same. For directory acls we must also
 946                          * ensure the POSIX ACL types are the same. */
 947
 948                         if (!dir_acl) {
 949                                 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 950                                                 (curr_ace->attr == curr_ace_outer->attr));
 951                         } else {
 952                                 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 953                                                 (curr_ace->type == curr_ace_outer->type) &&
 954                                                 (curr_ace->attr == curr_ace_outer->attr));
 955                         }
 956
 957                         if (can_merge) {
 958                                 if( DEBUGLVL( 10 )) {
 959                                         dbgtext("merge_aces: Merging ACE's\n");
 960                                         print_canon_ace( curr_ace_outer, 0);
 961                                         print_canon_ace( curr_ace, 0);
 962                                 }
 963
 964                                 /* Merge two allow or two deny ACE's. */
 965
 966                                 /* Theoretically we shouldn't merge a dir ACE if
 967                                  * one ACE has the CI flag set, and the other
 968                                  * ACE has the OI flag set, but this is rare
 969                                  * enough we can ignore it. */
 970
 971                                 curr_ace_outer->perms |= curr_ace->perms;
 972                                 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
 973                                 DLIST_REMOVE(l_head, curr_ace);
 974                                 SAFE_FREE(curr_ace);
 975                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 976                         }
 977                 }
 978         }
 979
 980         /*
 981          * Now go through and mask off allow permissions with deny permissions.
 982          * We can delete either the allow or deny here as we know that each SID
 983          * appears only once in the list.
 984          */
 985
 986         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 987                 canon_ace *curr_ace;
 988                 canon_ace *curr_ace_next;
 989
 990                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 991
 992                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 993
 994                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 995
 996                         /*
 997                          * Subtract ACE's with different entries. Due to the ordering constraints
 998                          * we've put on the ACL, we know the deny must be the first one.
 999                          */
1000
1001                         if (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1002                                 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1003
1004                                 if( DEBUGLVL( 10 )) {
1005                                         dbgtext("merge_aces: Masking ACE's\n");
1006                                         print_canon_ace( curr_ace_outer, 0);
1007                                         print_canon_ace( curr_ace, 0);
1008                                 }
1009
1010                                 curr_ace->perms &= ~curr_ace_outer->perms;
1011
1012                                 if (curr_ace->perms == 0) {
1013
1014                                         /*
1015                                          * The deny overrides the allow. Remove the allow.
1016                                          */
1017
1018                                         DLIST_REMOVE(l_head, curr_ace);
1019                                         SAFE_FREE(curr_ace);
1020                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1021
1022                                 } else {
1023
1024                                         /*
1025                                          * Even after removing permissions, there
1026                                          * are still allow permissions - delete the deny.
1027                                          * It is safe to delete the deny here,
1028                                          * as we are guarenteed by the deny first
1029                                          * ordering that all the deny entries for
1030                                          * this SID have already been merged into one
1031                                          * before we can get to an allow ace.
1032                                          */
1033
1034                                         DLIST_REMOVE(l_head, curr_ace_outer);
1035                                         SAFE_FREE(curr_ace_outer);
1036                                         break;
1037                                 }
1038                         }
1039
1040                 } /* end for curr_ace */
1041         } /* end for curr_ace_outer */
1042
1043         /* We may have modified the list. */
1044
1045         *pp_list_head = l_head;
1046 }
1047
1048 /****************************************************************************
1049  Check if we need to return NT4.x compatible ACL entries.
1050 ****************************************************************************/
1051
1052 bool nt4_compatible_acls(void)
1053 {
1054         int compat = lp_acl_compatibility();
1055
1056         if (compat == ACL_COMPAT_AUTO) {
1057                 enum remote_arch_types ra_type = get_remote_arch();
1058
1059                 /* Automatically adapt to client */
1060                 return (ra_type <= RA_WINNT);
1061         } else
1062                 return (compat == ACL_COMPAT_WINNT);
1063 }
1064
1065
1066 /****************************************************************************
1067  Map canon_ace perms to permission bits NT.
1068  The attr element is not used here - we only process deny entries on set,
1069  not get. Deny entries are implicit on get with ace->perms = 0.
1070 ****************************************************************************/
1071
1072 uint32_t map_canon_ace_perms(int snum,
1073                                 enum security_ace_type *pacl_type,
1074                                 mode_t perms,
1075                                 bool directory_ace)
1076 {
1077         uint32_t nt_mask = 0;
1078
1079         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1080
1081         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1082                 if (directory_ace) {
1083                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1084                 } else {
1085                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1086                 }
1087         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1088                 /*
1089                  * Windows NT refuses to display ACEs with no permissions in them (but
1090                  * they are perfectly legal with Windows 2000). If the ACE has empty
1091                  * permissions we cannot use 0, so we use the otherwise unused
1092                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1093                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1094                  * to be changed in the future.
1095                  */
1096
1097                 if (nt4_compatible_acls())
1098                         nt_mask = UNIX_ACCESS_NONE;
1099                 else
1100                         nt_mask = 0;
1101         } else {
1102                 if (directory_ace) {
1103                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1104                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1105                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1106                 } else {
1107                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1108                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1109                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1110                 }
1111         }
1112
1113         if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1114                 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1115         }
1116
1117         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1118                         (unsigned int)perms, (unsigned int)nt_mask ));
1119
1120         return nt_mask;
1121 }
1122
1123 /****************************************************************************
1124  Map NT perms to a UNIX mode_t.
1125 ****************************************************************************/
1126
1127 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
1128 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
1129 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1130
1131 static mode_t map_nt_perms( uint32 *mask, int type)
1132 {
1133         mode_t mode = 0;
1134
1135         switch(type) {
1136         case S_IRUSR:
1137                 if((*mask) & GENERIC_ALL_ACCESS)
1138                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1139                 else {
1140                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1141                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1142                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1143                 }
1144                 break;
1145         case S_IRGRP:
1146                 if((*mask) & GENERIC_ALL_ACCESS)
1147                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1148                 else {
1149                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1150                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1151                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1152                 }
1153                 break;
1154         case S_IROTH:
1155                 if((*mask) & GENERIC_ALL_ACCESS)
1156                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1157                 else {
1158                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1159                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1160                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1161                 }
1162                 break;
1163         }
1164
1165         return mode;
1166 }
1167
1168 /****************************************************************************
1169  Unpack a struct security_descriptor into a UNIX owner and group.
1170 ****************************************************************************/
1171
1172 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1173                         uid_t *puser, gid_t *pgrp,
1174                         uint32 security_info_sent, const struct
1175                         security_descriptor *psd)
1176 {
1177         struct dom_sid owner_sid;
1178         struct dom_sid grp_sid;
1179
1180         *puser = (uid_t)-1;
1181         *pgrp = (gid_t)-1;
1182
1183         if(security_info_sent == 0) {
1184                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1185                 return NT_STATUS_OK;
1186         }
1187
1188         /*
1189          * Validate the owner and group SID's.
1190          */
1191
1192         memset(&owner_sid, '\0', sizeof(owner_sid));
1193         memset(&grp_sid, '\0', sizeof(grp_sid));
1194
1195         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1196
1197         /*
1198          * Don't immediately fail if the owner sid cannot be validated.
1199          * This may be a group chown only set.
1200          */
1201
1202         if (security_info_sent & SECINFO_OWNER) {
1203                 sid_copy(&owner_sid, psd->owner_sid);
1204                 if (!sid_to_uid(&owner_sid, puser)) {
1205                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1206                                 /* this allows take ownership to work
1207                                  * reasonably */
1208                                 *puser = get_current_uid(conn);
1209                         } else {
1210                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1211                                          " owner sid for %s\n",
1212                                          sid_string_dbg(&owner_sid)));
1213                                 return NT_STATUS_INVALID_OWNER;
1214                         }
1215                 }
1216                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1217                          (unsigned int)*puser ));
1218         }
1219
1220         /*
1221          * Don't immediately fail if the group sid cannot be validated.
1222          * This may be an owner chown only set.
1223          */
1224
1225         if (security_info_sent & SECINFO_GROUP) {
1226                 sid_copy(&grp_sid, psd->group_sid);
1227                 if (!sid_to_gid( &grp_sid, pgrp)) {
1228                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1229                                 /* this allows take group ownership to work
1230                                  * reasonably */
1231                                 *pgrp = get_current_gid(conn);
1232                         } else {
1233                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1234                                          " group sid.\n"));
1235                                 return NT_STATUS_INVALID_OWNER;
1236                         }
1237                 }
1238                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1239                          (unsigned int)*pgrp));
1240         }
1241
1242         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1243
1244         return NT_STATUS_OK;
1245 }
1246
1247 /****************************************************************************
1248  Ensure the enforced permissions for this share apply.
1249 ****************************************************************************/
1250
1251 static void apply_default_perms(const struct share_params *params,
1252                                 const bool is_directory, canon_ace *pace,
1253                                 mode_t type)
1254 {
1255         mode_t and_bits = (mode_t)0;
1256         mode_t or_bits = (mode_t)0;
1257
1258         /* Get the initial bits to apply. */
1259
1260         if (is_directory) {
1261                 and_bits = lp_dir_security_mask(params->service);
1262                 or_bits = lp_force_dir_security_mode(params->service);
1263         } else {
1264                 and_bits = lp_security_mask(params->service);
1265                 or_bits = lp_force_security_mode(params->service);
1266         }
1267
1268         /* Now bounce them into the S_USR space. */
1269         switch(type) {
1270         case S_IRUSR:
1271                 /* Ensure owner has read access. */
1272                 pace->perms |= S_IRUSR;
1273                 if (is_directory)
1274                         pace->perms |= (S_IWUSR|S_IXUSR);
1275                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1276                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1277                 break;
1278         case S_IRGRP:
1279                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1280                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1281                 break;
1282         case S_IROTH:
1283                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1284                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1285                 break;
1286         }
1287
1288         pace->perms = ((pace->perms & and_bits)|or_bits);
1289 }
1290
1291 /****************************************************************************
1292  Check if a given uid/SID is in a group gid/SID. This is probably very
1293  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1294 ****************************************************************************/
1295
1296 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1297 {
1298         const char *u_name = NULL;
1299
1300         /* "Everyone" always matches every uid. */
1301
1302         if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1303                 return True;
1304
1305         /*
1306          * if it's the current user, we already have the unix token
1307          * and don't need to do the complex user_in_group_sid() call
1308          */
1309         if (uid_ace->unix_ug.uid == get_current_uid(conn)) {
1310                 const struct security_unix_token *curr_utok = NULL;
1311                 size_t i;
1312
1313                 if (group_ace->unix_ug.gid == get_current_gid(conn)) {
1314                         return True;
1315                 }
1316
1317                 curr_utok = get_current_utok(conn);
1318                 for (i=0; i < curr_utok->ngroups; i++) {
1319                         if (group_ace->unix_ug.gid == curr_utok->groups[i]) {
1320                                 return True;
1321                         }
1322                 }
1323         }
1324
1325         /* u_name talloc'ed off tos. */
1326         u_name = uidtoname(uid_ace->unix_ug.uid);
1327         if (!u_name) {
1328                 return False;
1329         }
1330
1331         /*
1332          * user_in_group_sid() uses create_token_from_username()
1333          * which creates an artificial NT token given just a username,
1334          * so this is not reliable for users from foreign domains
1335          * exported by winbindd!
1336          */
1337         return user_in_group_sid(u_name, &group_ace->trustee);
1338 }
1339
1340 /****************************************************************************
1341  A well formed POSIX file or default ACL has at least 3 entries, a
1342  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1343  In addition, the owner must always have at least read access.
1344  When using this call on get_acl, the pst struct is valid and contains
1345  the mode of the file. When using this call on set_acl, the pst struct has
1346  been modified to have a mode containing the default for this file or directory
1347  type.
1348 ****************************************************************************/
1349
1350 static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
1351                                      const struct share_params *params,
1352                                      const bool is_directory,
1353                                                         const struct dom_sid *pfile_owner_sid,
1354                                                         const struct dom_sid *pfile_grp_sid,
1355                                                         const SMB_STRUCT_STAT *pst,
1356                                                         bool setting_acl)
1357 {
1358         canon_ace *pace;
1359         bool got_user = False;
1360         bool got_grp = False;
1361         bool got_other = False;
1362         canon_ace *pace_other = NULL;
1363
1364         for (pace = *pp_ace; pace; pace = pace->next) {
1365                 if (pace->type == SMB_ACL_USER_OBJ) {
1366
1367                         if (setting_acl)
1368                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1369                         got_user = True;
1370
1371                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1372
1373                         /*
1374                          * Ensure create mask/force create mode is respected on set.
1375                          */
1376
1377                         if (setting_acl)
1378                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1379                         got_grp = True;
1380
1381                 } else if (pace->type == SMB_ACL_OTHER) {
1382
1383                         /*
1384                          * Ensure create mask/force create mode is respected on set.
1385                          */
1386
1387                         if (setting_acl)
1388                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1389                         got_other = True;
1390                         pace_other = pace;
1391                 }
1392         }
1393
1394         if (!got_user) {
1395                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1396                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1397                         return False;
1398                 }
1399
1400                 ZERO_STRUCTP(pace);
1401                 pace->type = SMB_ACL_USER_OBJ;
1402                 pace->owner_type = UID_ACE;
1403                 pace->unix_ug.uid = pst->st_ex_uid;
1404                 pace->trustee = *pfile_owner_sid;
1405                 pace->attr = ALLOW_ACE;
1406
1407                 if (setting_acl) {
1408                         /* See if the owning user is in any of the other groups in
1409                            the ACE. If so, OR in the permissions from that group. */
1410
1411                         bool group_matched = False;
1412                         canon_ace *pace_iter;
1413
1414                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1415                                 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1416                                         if (uid_entry_in_group(conn, pace, pace_iter)) {
1417                                                 pace->perms |= pace_iter->perms;
1418                                                 group_matched = True;
1419                                         }
1420                                 }
1421                         }
1422
1423                         /* If we only got an "everyone" perm, just use that. */
1424                         if (!group_matched) {
1425                                 if (got_other)
1426                                         pace->perms = pace_other->perms;
1427                                 else
1428                                         pace->perms = 0;
1429                         }
1430
1431                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1432                 } else {
1433                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1434                 }
1435
1436                 DLIST_ADD(*pp_ace, pace);
1437         }
1438
1439         if (!got_grp) {
1440                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1441                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1442                         return False;
1443                 }
1444
1445                 ZERO_STRUCTP(pace);
1446                 pace->type = SMB_ACL_GROUP_OBJ;
1447                 pace->owner_type = GID_ACE;
1448                 pace->unix_ug.uid = pst->st_ex_gid;
1449                 pace->trustee = *pfile_grp_sid;
1450                 pace->attr = ALLOW_ACE;
1451                 if (setting_acl) {
1452                         /* If we only got an "everyone" perm, just use that. */
1453                         if (got_other)
1454                                 pace->perms = pace_other->perms;
1455                         else
1456                                 pace->perms = 0;
1457                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1458                 } else {
1459                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1460                 }
1461
1462                 DLIST_ADD(*pp_ace, pace);
1463         }
1464
1465         if (!got_other) {
1466                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1467                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1468                         return False;
1469                 }
1470
1471                 ZERO_STRUCTP(pace);
1472                 pace->type = SMB_ACL_OTHER;
1473                 pace->owner_type = WORLD_ACE;
1474                 pace->unix_ug.world = -1;
1475                 pace->trustee = global_sid_World;
1476                 pace->attr = ALLOW_ACE;
1477                 if (setting_acl) {
1478                         pace->perms = 0;
1479                         apply_default_perms(params, is_directory, pace, S_IROTH);
1480                 } else
1481                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1482
1483                 DLIST_ADD(*pp_ace, pace);
1484         }
1485
1486         return True;
1487 }
1488
1489 /****************************************************************************
1490  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1491  If it does not have them, check if there are any entries where the trustee is the
1492  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1493 ****************************************************************************/
1494
1495 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1496 {
1497         bool got_user_obj, got_group_obj;
1498         canon_ace *current_ace;
1499         int i, entries;
1500
1501         entries = count_canon_ace_list(ace);
1502         got_user_obj = False;
1503         got_group_obj = False;
1504
1505         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1506                 if (current_ace->type == SMB_ACL_USER_OBJ)
1507                         got_user_obj = True;
1508                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1509                         got_group_obj = True;
1510         }
1511         if (got_user_obj && got_group_obj) {
1512                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1513                 return;
1514         }
1515
1516         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1517                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1518                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1519                         current_ace->type = SMB_ACL_USER_OBJ;
1520                         got_user_obj = True;
1521                 }
1522                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1523                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1524                         current_ace->type = SMB_ACL_GROUP_OBJ;
1525                         got_group_obj = True;
1526                 }
1527         }
1528         if (!got_user_obj)
1529                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1530         if (!got_group_obj)
1531                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1532 }
1533
1534 /****************************************************************************
1535  If an ACE entry is SMB_ACL_USER_OBJ and not CREATOR_OWNER, map to SMB_ACL_USER.
1536  If an ACE entry is SMB_ACL_GROUP_OBJ and not CREATOR_GROUP, map to SMB_ACL_GROUP
1537 ****************************************************************************/
1538
1539 static bool dup_owning_ace(canon_ace *dir_ace, canon_ace *ace)
1540 {
1541         /* dir ace must be followings.
1542            SMB_ACL_USER_OBJ : trustee(CREATOR_OWNER) -> Posix ACL d:u::perm
1543            SMB_ACL_USER     : not trustee    -> Posix ACL u:user:perm
1544            SMB_ACL_USER_OBJ : trustee -> convert to SMB_ACL_USER : trustee
1545            Posix ACL u:trustee:perm
1546
1547            SMB_ACL_GROUP_OBJ: trustee(CREATOR_GROUP) -> Posix ACL d:g::perm
1548            SMB_ACL_GROUP    : not trustee   -> Posix ACL g:group:perm
1549            SMB_ACL_GROUP_OBJ: trustee -> convert to SMB_ACL_GROUP : trustee
1550            Posix ACL g:trustee:perm
1551         */
1552
1553         if (ace->type == SMB_ACL_USER_OBJ &&
1554                         !(dom_sid_equal(&ace->trustee, &global_sid_Creator_Owner))) {
1555                 canon_ace *dup_ace = dup_canon_ace(ace);
1556
1557                 if (dup_ace == NULL) {
1558                         return false;
1559                 }
1560                 dup_ace->type = SMB_ACL_USER;
1561                 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1562         }
1563
1564         if (ace->type == SMB_ACL_GROUP_OBJ &&
1565                         !(dom_sid_equal(&ace->trustee, &global_sid_Creator_Group))) {
1566                 canon_ace *dup_ace = dup_canon_ace(ace);
1567
1568                 if (dup_ace == NULL) {
1569                         return false;
1570                 }
1571                 dup_ace->type = SMB_ACL_GROUP;
1572                 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1573         }
1574
1575         return true;
1576 }
1577
1578 /****************************************************************************
1579  Unpack a struct security_descriptor into two canonical ace lists.
1580 ****************************************************************************/
1581
1582 static bool create_canon_ace_lists(files_struct *fsp,
1583                                         const SMB_STRUCT_STAT *pst,
1584                                         struct dom_sid *pfile_owner_sid,
1585                                         struct dom_sid *pfile_grp_sid,
1586                                         canon_ace **ppfile_ace,
1587                                         canon_ace **ppdir_ace,
1588                                         const struct security_acl *dacl)
1589 {
1590         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1591         canon_ace *file_ace = NULL;
1592         canon_ace *dir_ace = NULL;
1593         canon_ace *current_ace = NULL;
1594         bool got_dir_allow = False;
1595         bool got_file_allow = False;
1596         int i, j;
1597
1598         *ppfile_ace = NULL;
1599         *ppdir_ace = NULL;
1600
1601         /*
1602          * Convert the incoming ACL into a more regular form.
1603          */
1604
1605         for(i = 0; i < dacl->num_aces; i++) {
1606                 struct security_ace *psa = &dacl->aces[i];
1607
1608                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1609                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1610                         return False;
1611                 }
1612
1613                 if (nt4_compatible_acls()) {
1614                         /*
1615                          * The security mask may be UNIX_ACCESS_NONE which should map into
1616                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1617                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1618                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1619                          */
1620
1621                         /*
1622                          * Convert GENERIC bits to specific bits.
1623                          */
1624
1625                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1626
1627                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1628
1629                         if(psa->access_mask != UNIX_ACCESS_NONE)
1630                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1631                 }
1632         }
1633
1634         /*
1635          * Deal with the fact that NT 4.x re-writes the canonical format
1636          * that we return for default ACLs. If a directory ACE is identical
1637          * to a inherited directory ACE then NT changes the bits so that the
1638          * first ACE is set to OI|IO and the second ACE for this SID is set
1639          * to CI. We need to repair this. JRA.
1640          */
1641
1642         for(i = 0; i < dacl->num_aces; i++) {
1643                 struct security_ace *psa1 = &dacl->aces[i];
1644
1645                 for (j = i + 1; j < dacl->num_aces; j++) {
1646                         struct security_ace *psa2 = &dacl->aces[j];
1647
1648                         if (psa1->access_mask != psa2->access_mask)
1649                                 continue;
1650
1651                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1652                                 continue;
1653
1654                         /*
1655                          * Ok - permission bits and SIDs are equal.
1656                          * Check if flags were re-written.
1657                          */
1658
1659                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1660
1661                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1662                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1663
1664                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1665
1666                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1667                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1668
1669                         }
1670                 }
1671         }
1672
1673         for(i = 0; i < dacl->num_aces; i++) {
1674                 struct security_ace *psa = &dacl->aces[i];
1675
1676                 /*
1677                  * Create a canon_ace entry representing this NT DACL ACE.
1678                  */
1679
1680                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1681                         free_canon_ace_list(file_ace);
1682                         free_canon_ace_list(dir_ace);
1683                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1684                         return False;
1685                 }
1686
1687                 ZERO_STRUCTP(current_ace);
1688
1689                 sid_copy(&current_ace->trustee, &psa->trustee);
1690
1691                 /*
1692                  * Try and work out if the SID is a user or group
1693                  * as we need to flag these differently for POSIX.
1694                  * Note what kind of a POSIX ACL this should map to.
1695                  */
1696
1697                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1698                         current_ace->owner_type = WORLD_ACE;
1699                         current_ace->unix_ug.world = -1;
1700                         current_ace->type = SMB_ACL_OTHER;
1701                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1702                         current_ace->owner_type = UID_ACE;
1703                         current_ace->unix_ug.uid = pst->st_ex_uid;
1704                         current_ace->type = SMB_ACL_USER_OBJ;
1705
1706                         /*
1707                          * The Creator Owner entry only specifies inheritable permissions,
1708                          * never access permissions. WinNT doesn't always set the ACE to
1709                          * INHERIT_ONLY, though.
1710                          */
1711
1712                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1713
1714                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1715                         current_ace->owner_type = GID_ACE;
1716                         current_ace->unix_ug.gid = pst->st_ex_gid;
1717                         current_ace->type = SMB_ACL_GROUP_OBJ;
1718
1719                         /*
1720                          * The Creator Group entry only specifies inheritable permissions,
1721                          * never access permissions. WinNT doesn't always set the ACE to
1722                          * INHERIT_ONLY, though.
1723                          */
1724                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1725
1726                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1727                         current_ace->owner_type = UID_ACE;
1728                         /* If it's the owning user, this is a user_obj, not
1729                          * a user. */
1730                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1731                                 current_ace->type = SMB_ACL_USER_OBJ;
1732                         } else {
1733                                 current_ace->type = SMB_ACL_USER;
1734                         }
1735                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1736                         current_ace->owner_type = GID_ACE;
1737                         /* If it's the primary group, this is a group_obj, not
1738                          * a group. */
1739                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1740                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1741                         } else {
1742                                 current_ace->type = SMB_ACL_GROUP;
1743                         }
1744                 } else {
1745                         /*
1746                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1747                          */
1748
1749                         if (non_mappable_sid(&psa->trustee)) {
1750                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1751                                            "non-mappable SID %s\n",
1752                                            sid_string_dbg(&psa->trustee)));
1753                                 SAFE_FREE(current_ace);
1754                                 continue;
1755                         }
1756
1757                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1758                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1759                                         "unknown or foreign SID %s\n",
1760                                         sid_string_dbg(&psa->trustee)));
1761                                 SAFE_FREE(current_ace);
1762                                 continue;
1763                         }
1764
1765                         free_canon_ace_list(file_ace);
1766                         free_canon_ace_list(dir_ace);
1767                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1768                                   "%s to uid or gid.\n",
1769                                   sid_string_dbg(&current_ace->trustee)));
1770                         SAFE_FREE(current_ace);
1771                         return False;
1772                 }
1773
1774                 /*
1775                  * Map the given NT permissions into a UNIX mode_t containing only
1776                  * S_I(R|W|X)USR bits.
1777                  */
1778
1779                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1780                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1781
1782                 /* Store the ace_flag. */
1783                 current_ace->ace_flags = psa->flags;
1784
1785                 /*
1786                  * Now add the created ace to either the file list, the directory
1787                  * list, or both. We *MUST* preserve the order here (hence we use
1788                  * DLIST_ADD_END) as NT ACLs are order dependent.
1789                  */
1790
1791                 if (fsp->is_directory) {
1792
1793                         /*
1794                          * We can only add to the default POSIX ACE list if the ACE is
1795                          * designed to be inherited by both files and directories.
1796                          */
1797
1798                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1799                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1800
1801                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1802
1803                                 /*
1804                                  * Note if this was an allow ace. We can't process
1805                                  * any further deny ace's after this.
1806                                  */
1807
1808                                 if (current_ace->attr == ALLOW_ACE)
1809                                         got_dir_allow = True;
1810
1811                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1812                                         DEBUG(0,("create_canon_ace_lists: "
1813                                                  "malformed ACL in "
1814                                                  "inheritable ACL! Deny entry "
1815                                                  "after Allow entry. Failing "
1816                                                  "to set on file %s.\n",
1817                                                  fsp_str_dbg(fsp)));
1818                                         free_canon_ace_list(file_ace);
1819                                         free_canon_ace_list(dir_ace);
1820                                         return False;
1821                                 }
1822
1823                                 if( DEBUGLVL( 10 )) {
1824                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1825                                         print_canon_ace( current_ace, 0);
1826                                 }
1827
1828                                 /*
1829                                  * We have a lossy mapping: directory ACE entries
1830                                  * CREATOR_OWNER ------\
1831                                  *     (map to)         +---> SMB_ACL_USER_OBJ
1832                                  * owning sid    ------/
1833                                  *
1834                                  * CREATOR_GROUP ------\
1835                                  *     (map to)         +---> SMB_ACL_GROUP_OBJ
1836                                  * primary group sid --/
1837                                  *
1838                                  * on set. And on read of a directory ACL
1839                                  *
1840                                  * SMB_ACL_USER_OBJ ----> CREATOR_OWNER
1841                                  * SMB_ACL_GROUP_OBJ ---> CREATOR_GROUP.
1842                                  *
1843                                  * Deal with this on set by duplicating
1844                                  * owning sid and primary group sid ACE
1845                                  * entries into the directory ACL.
1846                                  * Fix from Tsukasa Hamano <hamano@osstech.co.jp>.
1847                                  */
1848
1849                                 if (!dup_owning_ace(dir_ace, current_ace)) {
1850                                         DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1851                                         free_canon_ace_list(file_ace);
1852                                         free_canon_ace_list(dir_ace);
1853                                         return false;
1854                                 }
1855
1856                                 /*
1857                                  * If this is not an inherit only ACE we need to add a duplicate
1858                                  * to the file acl.
1859                                  */
1860
1861                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1862                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1863
1864                                         if (!dup_ace) {
1865                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1866                                                 free_canon_ace_list(file_ace);
1867                                                 free_canon_ace_list(dir_ace);
1868                                                 return False;
1869                                         }
1870
1871                                         /*
1872                                          * We must not free current_ace here as its
1873                                          * pointer is now owned by the dir_ace list.
1874                                          */
1875                                         current_ace = dup_ace;
1876                                         /* We've essentially split this ace into two,
1877                                          * and added the ace with inheritance request
1878                                          * bits to the directory ACL. Drop those bits for
1879                                          * the ACE we're adding to the file list. */
1880                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1881                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1882                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1883                                 } else {
1884                                         /*
1885                                          * We must not free current_ace here as its
1886                                          * pointer is now owned by the dir_ace list.
1887                                          */
1888                                         current_ace = NULL;
1889                                 }
1890                         }
1891                 }
1892
1893                 /*
1894                  * Only add to the file ACL if not inherit only.
1895                  */
1896
1897                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1898                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1899
1900                         /*
1901                          * Note if this was an allow ace. We can't process
1902                          * any further deny ace's after this.
1903                          */
1904
1905                         if (current_ace->attr == ALLOW_ACE)
1906                                 got_file_allow = True;
1907
1908                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1909                                 DEBUG(0,("create_canon_ace_lists: malformed "
1910                                          "ACL in file ACL ! Deny entry after "
1911                                          "Allow entry. Failing to set on file "
1912                                          "%s.\n", fsp_str_dbg(fsp)));
1913                                 free_canon_ace_list(file_ace);
1914                                 free_canon_ace_list(dir_ace);
1915                                 return False;
1916                         }
1917
1918                         if( DEBUGLVL( 10 )) {
1919                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1920                                 print_canon_ace( current_ace, 0);
1921                         }
1922                         all_aces_are_inherit_only = False;
1923                         /*
1924                          * We must not free current_ace here as its
1925                          * pointer is now owned by the file_ace list.
1926                          */
1927                         current_ace = NULL;
1928                 }
1929
1930                 /*
1931                  * Free if ACE was not added.
1932                  */
1933
1934                 SAFE_FREE(current_ace);
1935         }
1936
1937         if (fsp->is_directory && all_aces_are_inherit_only) {
1938                 /*
1939                  * Windows 2000 is doing one of these weird 'inherit acl'
1940                  * traverses to conserve NTFS ACL resources. Just pretend
1941                  * there was no DACL sent. JRA.
1942                  */
1943
1944                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1945                 free_canon_ace_list(file_ace);
1946                 free_canon_ace_list(dir_ace);
1947                 file_ace = NULL;
1948                 dir_ace = NULL;
1949         } else {
1950                 /*
1951                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1952                  * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1953                  * entries can be converted to *_OBJ. Usually we will already have these
1954                  * entries in the Default ACL, and the Access ACL will not have them.
1955                  */
1956                 if (file_ace) {
1957                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1958                 }
1959                 if (dir_ace) {
1960                         check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1961                 }
1962         }
1963
1964         *ppfile_ace = file_ace;
1965         *ppdir_ace = dir_ace;
1966
1967         return True;
1968 }
1969
1970 /****************************************************************************
1971  ASCII art time again... JRA :-).
1972
1973  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1974  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1975  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1976  allow or deny have been merged, so the same SID can only appear once in the deny
1977  list or once in the allow list.
1978
1979  We then process as follows :
1980
1981  ---------------------------------------------------------------------------
1982  First pass - look for a Everyone DENY entry.
1983
1984  If it is deny all (rwx) trunate the list at this point.
1985  Else, walk the list from this point and use the deny permissions of this
1986  entry as a mask on all following allow entries. Finally, delete
1987  the Everyone DENY entry (we have applied it to everything possible).
1988
1989  In addition, in this pass we remove any DENY entries that have
1990  no permissions (ie. they are a DENY nothing).
1991  ---------------------------------------------------------------------------
1992  Second pass - only deal with deny user entries.
1993
1994  DENY user1 (perms XXX)
1995
1996  new_perms = 0
1997  for all following allow group entries where user1 is in group
1998         new_perms |= group_perms;
1999
2000  user1 entry perms = new_perms & ~ XXX;
2001
2002  Convert the deny entry to an allow entry with the new perms and
2003  push to the end of the list. Note if the user was in no groups
2004  this maps to a specific allow nothing entry for this user.
2005
2006  The common case from the NT ACL choser (userX deny all) is
2007  optimised so we don't do the group lookup - we just map to
2008  an allow nothing entry.
2009
2010  What we're doing here is inferring the allow permissions the
2011  person setting the ACE on user1 wanted by looking at the allow
2012  permissions on the groups the user is currently in. This will
2013  be a snapshot, depending on group membership but is the best
2014  we can do and has the advantage of failing closed rather than
2015  open.
2016  ---------------------------------------------------------------------------
2017  Third pass - only deal with deny group entries.
2018
2019  DENY group1 (perms XXX)
2020
2021  for all following allow user entries where user is in group1
2022    user entry perms = user entry perms & ~ XXX;
2023
2024  If there is a group Everyone allow entry with permissions YYY,
2025  convert the group1 entry to an allow entry and modify its
2026  permissions to be :
2027
2028  new_perms = YYY & ~ XXX
2029
2030  and push to the end of the list.
2031
2032  If there is no group Everyone allow entry then convert the
2033  group1 entry to a allow nothing entry and push to the end of the list.
2034
2035  Note that the common case from the NT ACL choser (groupX deny all)
2036  cannot be optimised here as we need to modify user entries who are
2037  in the group to change them to a deny all also.
2038
2039  What we're doing here is modifying the allow permissions of
2040  user entries (which are more specific in POSIX ACLs) to mask
2041  out the explicit deny set on the group they are in. This will
2042  be a snapshot depending on current group membership but is the
2043  best we can do and has the advantage of failing closed rather
2044  than open.
2045  ---------------------------------------------------------------------------
2046  Fourth pass - cope with cumulative permissions.
2047
2048  for all allow user entries, if there exists an allow group entry with
2049  more permissive permissions, and the user is in that group, rewrite the
2050  allow user permissions to contain both sets of permissions.
2051
2052  Currently the code for this is #ifdef'ed out as these semantics make
2053  no sense to me. JRA.
2054  ---------------------------------------------------------------------------
2055
2056  Note we *MUST* do the deny user pass first as this will convert deny user
2057  entries into allow user entries which can then be processed by the deny
2058  group pass.
2059
2060  The above algorithm took a *lot* of thinking about - hence this
2061  explaination :-). JRA.
2062 ****************************************************************************/
2063
2064 /****************************************************************************
2065  Process a canon_ace list entries. This is very complex code. We need
2066  to go through and remove the "deny" permissions from any allow entry that matches
2067  the id of this entry. We have already refused any NT ACL that wasn't in correct
2068  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2069  we just remove it (to fail safe). We have already removed any duplicate ace
2070  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2071  allow entries.
2072 ****************************************************************************/
2073
2074 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2075 {
2076         canon_ace *ace_list = *pp_ace_list;
2077         canon_ace *curr_ace = NULL;
2078         canon_ace *curr_ace_next = NULL;
2079
2080         /* Pass 1 above - look for an Everyone, deny entry. */
2081
2082         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2083                 canon_ace *allow_ace_p;
2084
2085                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2086
2087                 if (curr_ace->attr != DENY_ACE)
2088                         continue;
2089
2090                 if (curr_ace->perms == (mode_t)0) {
2091
2092                         /* Deny nothing entry - delete. */
2093
2094                         DLIST_REMOVE(ace_list, curr_ace);
2095                         continue;
2096                 }
2097
2098                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2099                         continue;
2100
2101                 /* JRATEST - assert. */
2102                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2103
2104                 if (curr_ace->perms == ALL_ACE_PERMS) {
2105
2106                         /*
2107                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2108                          * list at this point including this entry.
2109                          */
2110
2111                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2112
2113                         free_canon_ace_list( curr_ace );
2114                         if (prev_entry)
2115                                 DLIST_REMOVE(ace_list, prev_entry);
2116                         else {
2117                                 /* We deleted the entire list. */
2118                                 ace_list = NULL;
2119                         }
2120                         break;
2121                 }
2122
2123                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2124
2125                         /*
2126                          * Only mask off allow entries.
2127                          */
2128
2129                         if (allow_ace_p->attr != ALLOW_ACE)
2130                                 continue;
2131
2132                         allow_ace_p->perms &= ~curr_ace->perms;
2133                 }
2134
2135                 /*
2136                  * Now it's been applied, remove it.
2137                  */
2138
2139                 DLIST_REMOVE(ace_list, curr_ace);
2140         }
2141
2142         /* Pass 2 above - deal with deny user entries. */
2143
2144         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2145                 mode_t new_perms = (mode_t)0;
2146                 canon_ace *allow_ace_p;
2147
2148                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2149
2150                 if (curr_ace->attr != DENY_ACE)
2151                         continue;
2152
2153                 if (curr_ace->owner_type != UID_ACE)
2154                         continue;
2155
2156                 if (curr_ace->perms == ALL_ACE_PERMS) {
2157
2158                         /*
2159                          * Optimisation - this is a deny everything to this user.
2160                          * Convert to an allow nothing and push to the end of the list.
2161                          */
2162
2163                         curr_ace->attr = ALLOW_ACE;
2164                         curr_ace->perms = (mode_t)0;
2165                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2166                         continue;
2167                 }
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                         /* We process GID_ACE and WORLD_ACE entries only. */
2175
2176                         if (allow_ace_p->owner_type == UID_ACE)
2177                                 continue;
2178
2179                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2180                                 new_perms |= allow_ace_p->perms;
2181                 }
2182
2183                 /*
2184                  * Convert to a allow entry, modify the perms and push to the end
2185                  * of the list.
2186                  */
2187
2188                 curr_ace->attr = ALLOW_ACE;
2189                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2190                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2191         }
2192
2193         /* Pass 3 above - deal with deny group entries. */
2194
2195         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2196                 canon_ace *allow_ace_p;
2197                 canon_ace *allow_everyone_p = NULL;
2198
2199                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2200
2201                 if (curr_ace->attr != DENY_ACE)
2202                         continue;
2203
2204                 if (curr_ace->owner_type != GID_ACE)
2205                         continue;
2206
2207                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2208
2209                         if (allow_ace_p->attr != ALLOW_ACE)
2210                                 continue;
2211
2212                         /* Store a pointer to the Everyone allow, if it exists. */
2213                         if (allow_ace_p->owner_type == WORLD_ACE)
2214                                 allow_everyone_p = allow_ace_p;
2215
2216                         /* We process UID_ACE entries only. */
2217
2218                         if (allow_ace_p->owner_type != UID_ACE)
2219                                 continue;
2220
2221                         /* Mask off the deny group perms. */
2222
2223                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2224                                 allow_ace_p->perms &= ~curr_ace->perms;
2225                 }
2226
2227                 /*
2228                  * Convert the deny to an allow with the correct perms and
2229                  * push to the end of the list.
2230                  */
2231
2232                 curr_ace->attr = ALLOW_ACE;
2233                 if (allow_everyone_p)
2234                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2235                 else
2236                         curr_ace->perms = (mode_t)0;
2237                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2238         }
2239
2240         /* Doing this fourth pass allows Windows semantics to be layered
2241          * on top of POSIX semantics. I'm not sure if this is desirable.
2242          * For example, in W2K ACLs there is no way to say, "Group X no
2243          * access, user Y full access" if user Y is a member of group X.
2244          * This seems completely broken semantics to me.... JRA.
2245          */
2246
2247 #if 0
2248         /* Pass 4 above - deal with allow entries. */
2249
2250         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2251                 canon_ace *allow_ace_p;
2252
2253                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2254
2255                 if (curr_ace->attr != ALLOW_ACE)
2256                         continue;
2257
2258                 if (curr_ace->owner_type != UID_ACE)
2259                         continue;
2260
2261                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2262
2263                         if (allow_ace_p->attr != ALLOW_ACE)
2264                                 continue;
2265
2266                         /* We process GID_ACE entries only. */
2267
2268                         if (allow_ace_p->owner_type != GID_ACE)
2269                                 continue;
2270
2271                         /* OR in the group perms. */
2272
2273                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2274                                 curr_ace->perms |= allow_ace_p->perms;
2275                 }
2276         }
2277 #endif
2278
2279         *pp_ace_list = ace_list;
2280 }
2281
2282 /****************************************************************************
2283  Create a default mode that will be used if a security descriptor entry has
2284  no user/group/world entries.
2285 ****************************************************************************/
2286
2287 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2288 {
2289         int snum = SNUM(fsp->conn);
2290         mode_t and_bits = (mode_t)0;
2291         mode_t or_bits = (mode_t)0;
2292         mode_t mode;
2293
2294         if (interitable_mode) {
2295                 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2296                                  fsp->fsp_name, NULL);
2297         } else {
2298                 mode = S_IRUSR;
2299         }
2300
2301         if (fsp->is_directory)
2302                 mode |= (S_IWUSR|S_IXUSR);
2303
2304         /*
2305          * Now AND with the create mode/directory mode bits then OR with the
2306          * force create mode/force directory mode bits.
2307          */
2308
2309         if (fsp->is_directory) {
2310                 and_bits = lp_dir_security_mask(snum);
2311                 or_bits = lp_force_dir_security_mode(snum);
2312         } else {
2313                 and_bits = lp_security_mask(snum);
2314                 or_bits = lp_force_security_mode(snum);
2315         }
2316
2317         return ((mode & and_bits)|or_bits);
2318 }
2319
2320 /****************************************************************************
2321  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2322  succeeding.
2323 ****************************************************************************/
2324
2325 static bool unpack_canon_ace(files_struct *fsp,
2326                                 const SMB_STRUCT_STAT *pst,
2327                                 struct dom_sid *pfile_owner_sid,
2328                                 struct dom_sid *pfile_grp_sid,
2329                                 canon_ace **ppfile_ace,
2330                                 canon_ace **ppdir_ace,
2331                                 uint32 security_info_sent,
2332                                 const struct security_descriptor *psd)
2333 {
2334         SMB_STRUCT_STAT st;
2335         canon_ace *file_ace = NULL;
2336         canon_ace *dir_ace = NULL;
2337
2338         *ppfile_ace = NULL;
2339         *ppdir_ace = NULL;
2340
2341         if(security_info_sent == 0) {
2342                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2343                 return False;
2344         }
2345
2346         /*
2347          * If no DACL then this is a chown only security descriptor.
2348          */
2349
2350         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2351                 return True;
2352
2353         /*
2354          * Now go through the DACL and create the canon_ace lists.
2355          */
2356
2357         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2358                                                                 &file_ace, &dir_ace, psd->dacl))
2359                 return False;
2360
2361         if ((file_ace == NULL) && (dir_ace == NULL)) {
2362                 /* W2K traverse DACL set - ignore. */
2363                 return True;
2364         }
2365
2366         /*
2367          * Go through the canon_ace list and merge entries
2368          * belonging to identical users of identical allow or deny type.
2369          * We can do this as all deny entries come first, followed by
2370          * all allow entries (we have mandated this before accepting this acl).
2371          */
2372
2373         print_canon_ace_list( "file ace - before merge", file_ace);
2374         merge_aces( &file_ace, false);
2375
2376         print_canon_ace_list( "dir ace - before merge", dir_ace);
2377         merge_aces( &dir_ace, true);
2378
2379         /*
2380          * NT ACLs are order dependent. Go through the acl lists and
2381          * process DENY entries by masking the allow entries.
2382          */
2383
2384         print_canon_ace_list( "file ace - before deny", file_ace);
2385         process_deny_list(fsp->conn, &file_ace);
2386
2387         print_canon_ace_list( "dir ace - before deny", dir_ace);
2388         process_deny_list(fsp->conn, &dir_ace);
2389
2390         /*
2391          * A well formed POSIX file or default ACL has at least 3 entries, a
2392          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2393          * and optionally a mask entry. Ensure this is the case.
2394          */
2395
2396         print_canon_ace_list( "file ace - before valid", file_ace);
2397
2398         st = *pst;
2399
2400         /*
2401          * A default 3 element mode entry for a file should be r-- --- ---.
2402          * A default 3 element mode entry for a directory should be rwx --- ---.
2403          */
2404
2405         st.st_ex_mode = create_default_mode(fsp, False);
2406
2407         if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2408                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2409                 free_canon_ace_list(file_ace);
2410                 free_canon_ace_list(dir_ace);
2411                 return False;
2412         }
2413
2414         print_canon_ace_list( "dir ace - before valid", dir_ace);
2415
2416         /*
2417          * A default inheritable 3 element mode entry for a directory should be the
2418          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2419          * it's a directory.
2420          */
2421
2422         st.st_ex_mode = create_default_mode(fsp, True);
2423
2424         if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2425                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2426                 free_canon_ace_list(file_ace);
2427                 free_canon_ace_list(dir_ace);
2428                 return False;
2429         }
2430
2431         print_canon_ace_list( "file ace - return", file_ace);
2432         print_canon_ace_list( "dir ace - return", dir_ace);
2433
2434         *ppfile_ace = file_ace;
2435         *ppdir_ace = dir_ace;
2436         return True;
2437
2438 }
2439
2440 /******************************************************************************
2441  When returning permissions, try and fit NT display
2442  semantics if possible. Note the the canon_entries here must have been malloced.
2443  The list format should be - first entry = owner, followed by group and other user
2444  entries, last entry = other.
2445
2446  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2447  are not ordered, and match on the most specific entry rather than walking a list,
2448  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2449
2450  Entry 0: owner : deny all except read and write.
2451  Entry 1: owner : allow read and write.
2452  Entry 2: group : deny all except read.
2453  Entry 3: group : allow read.
2454  Entry 4: Everyone : allow read.
2455
2456  But NT cannot display this in their ACL editor !
2457 ********************************************************************************/
2458
2459 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2460 {
2461         canon_ace *l_head = *pp_list_head;
2462         canon_ace *owner_ace = NULL;
2463         canon_ace *other_ace = NULL;
2464         canon_ace *ace = NULL;
2465
2466         for (ace = l_head; ace; ace = ace->next) {
2467                 if (ace->type == SMB_ACL_USER_OBJ)
2468                         owner_ace = ace;
2469                 else if (ace->type == SMB_ACL_OTHER) {
2470                         /* Last ace - this is "other" */
2471                         other_ace = ace;
2472                 }
2473         }
2474
2475         if (!owner_ace || !other_ace) {
2476                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2477                         filename ));
2478                 return;
2479         }
2480
2481         /*
2482          * The POSIX algorithm applies to owner first, and other last,
2483          * so ensure they are arranged in this order.
2484          */
2485
2486         if (owner_ace) {
2487                 DLIST_PROMOTE(l_head, owner_ace);
2488         }
2489
2490         if (other_ace) {
2491                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2492         }
2493
2494         /* We have probably changed the head of the list. */
2495
2496         *pp_list_head = l_head;
2497 }
2498
2499 /****************************************************************************
2500  Create a linked list of canonical ACE entries.
2501 ****************************************************************************/
2502
2503 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2504                                    const char *fname, SMB_ACL_T posix_acl,
2505                                    const SMB_STRUCT_STAT *psbuf,
2506                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2507 {
2508         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2509         canon_ace *l_head = NULL;
2510         canon_ace *ace = NULL;
2511         canon_ace *next_ace = NULL;
2512         int entry_id = SMB_ACL_FIRST_ENTRY;
2513         SMB_ACL_ENTRY_T entry;
2514         size_t ace_count;
2515
2516         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2517                 SMB_ACL_TAG_T tagtype;
2518                 SMB_ACL_PERMSET_T permset;
2519                 struct dom_sid sid;
2520                 posix_id unix_ug;
2521                 enum ace_owner owner_type;
2522
2523                 entry_id = SMB_ACL_NEXT_ENTRY;
2524
2525                 /* Is this a MASK entry ? */
2526                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2527                         continue;
2528
2529                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2530                         continue;
2531
2532                 /* Decide which SID to use based on the ACL type. */
2533                 switch(tagtype) {
2534                         case SMB_ACL_USER_OBJ:
2535                                 /* Get the SID from the owner. */
2536                                 sid_copy(&sid, powner);
2537                                 unix_ug.uid = psbuf->st_ex_uid;
2538                                 owner_type = UID_ACE;
2539                                 break;
2540                         case SMB_ACL_USER:
2541                                 {
2542                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2543                                         if (puid == NULL) {
2544                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2545                                                 continue;
2546                                         }
2547                                         uid_to_sid( &sid, *puid);
2548                                         unix_ug.uid = *puid;
2549                                         owner_type = UID_ACE;
2550                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2551                                         break;
2552                                 }
2553                         case SMB_ACL_GROUP_OBJ:
2554                                 /* Get the SID from the owning group. */
2555                                 sid_copy(&sid, pgroup);
2556                                 unix_ug.gid = psbuf->st_ex_gid;
2557                                 owner_type = GID_ACE;
2558                                 break;
2559                         case SMB_ACL_GROUP:
2560                                 {
2561                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2562                                         if (pgid == NULL) {
2563                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2564                                                 continue;
2565                                         }
2566                                         gid_to_sid( &sid, *pgid);
2567                                         unix_ug.gid = *pgid;
2568                                         owner_type = GID_ACE;
2569                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2570                                         break;
2571                                 }
2572                         case SMB_ACL_MASK:
2573                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2574                                 continue; /* Don't count the mask as an entry. */
2575                         case SMB_ACL_OTHER:
2576                                 /* Use the Everyone SID */
2577                                 sid = global_sid_World;
2578                                 unix_ug.world = -1;
2579                                 owner_type = WORLD_ACE;
2580                                 break;
2581                         default:
2582                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2583                                 continue;
2584                 }
2585
2586                 /*
2587                  * Add this entry to the list.
2588                  */
2589
2590                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2591                         goto fail;
2592
2593                 ZERO_STRUCTP(ace);
2594                 ace->type = tagtype;
2595                 ace->perms = convert_permset_to_mode_t(conn, permset);
2596                 ace->attr = ALLOW_ACE;
2597                 ace->trustee = sid;
2598                 ace->unix_ug = unix_ug;
2599                 ace->owner_type = owner_type;
2600                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2601
2602                 DLIST_ADD(l_head, ace);
2603         }
2604
2605         /*
2606          * This next call will ensure we have at least a user/group/world set.
2607          */
2608
2609         if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2610                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2611                                       psbuf, False))
2612                 goto fail;
2613
2614         /*
2615          * Now go through the list, masking the permissions with the
2616          * acl_mask. Ensure all DENY Entries are at the start of the list.
2617          */
2618
2619         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2620
2621         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2622                 next_ace = ace->next;
2623
2624                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2625                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2626                         ace->perms &= acl_mask;
2627
2628                 if (ace->perms == 0) {
2629                         DLIST_PROMOTE(l_head, ace);
2630                 }
2631
2632                 if( DEBUGLVL( 10 ) ) {
2633                         print_canon_ace(ace, ace_count);
2634                 }
2635         }
2636
2637         arrange_posix_perms(fname,&l_head );
2638
2639         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2640
2641         return l_head;
2642
2643   fail:
2644
2645         free_canon_ace_list(l_head);
2646         return NULL;
2647 }
2648
2649 /****************************************************************************
2650  Check if the current user group list contains a given group.
2651 ****************************************************************************/
2652
2653 static bool current_user_in_group(connection_struct *conn, gid_t gid)
2654 {
2655         int i;
2656         const struct security_unix_token *utok = get_current_utok(conn);
2657
2658         for (i = 0; i < utok->ngroups; i++) {
2659                 if (utok->groups[i] == gid) {
2660                         return True;
2661                 }
2662         }
2663
2664         return False;
2665 }
2666
2667 /****************************************************************************
2668  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2669 ****************************************************************************/
2670
2671 static bool acl_group_override(connection_struct *conn,
2672                                const struct smb_filename *smb_fname)
2673 {
2674         if ((errno != EPERM) && (errno != EACCES)) {
2675                 return false;
2676         }
2677
2678         /* file primary group == user primary or supplementary group */
2679         if (lp_acl_group_control(SNUM(conn)) &&
2680             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2681                 return true;
2682         }
2683
2684         /* user has writeable permission */
2685         if (lp_dos_filemode(SNUM(conn)) &&
2686             can_write_to_file(conn, smb_fname)) {
2687                 return true;
2688         }
2689
2690         return false;
2691 }
2692
2693 /****************************************************************************
2694  Attempt to apply an ACL to a file or directory.
2695 ****************************************************************************/
2696
2697 static bool set_canon_ace_list(files_struct *fsp,
2698                                 canon_ace *the_ace,
2699                                 bool default_ace,
2700                                 const SMB_STRUCT_STAT *psbuf,
2701                                 bool *pacl_set_support)
2702 {
2703         connection_struct *conn = fsp->conn;
2704         bool ret = False;
2705         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2706         canon_ace *p_ace;
2707         int i;
2708         SMB_ACL_ENTRY_T mask_entry;
2709         bool got_mask_entry = False;
2710         SMB_ACL_PERMSET_T mask_permset;
2711         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2712         bool needs_mask = False;
2713         mode_t mask_perms = 0;
2714
2715         /* Use the psbuf that was passed in. */
2716         if (psbuf != &fsp->fsp_name->st) {
2717                 fsp->fsp_name->st = *psbuf;
2718         }
2719
2720 #if defined(POSIX_ACL_NEEDS_MASK)
2721         /* HP-UX always wants to have a mask (called "class" there). */
2722         needs_mask = True;
2723 #endif
2724
2725         if (the_acl == NULL) {
2726
2727                 if (!no_acl_syscall_error(errno)) {
2728                         /*
2729                          * Only print this error message if we have some kind of ACL
2730                          * support that's not working. Otherwise we would always get this.
2731                          */
2732                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2733                                 default_ace ? "default" : "file", strerror(errno) ));
2734                 }
2735                 *pacl_set_support = False;
2736                 goto fail;
2737         }
2738
2739         if( DEBUGLVL( 10 )) {
2740                 dbgtext("set_canon_ace_list: setting ACL:\n");
2741                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2742                         print_canon_ace( p_ace, i);
2743                 }
2744         }
2745
2746         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2747                 SMB_ACL_ENTRY_T the_entry;
2748                 SMB_ACL_PERMSET_T the_permset;
2749
2750                 /*
2751                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2752                  * named group entries. But if there is an ACL_MASK entry, it applies
2753                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2754                  * so that it doesn't deny (i.e., mask off) any permissions.
2755                  */
2756
2757                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2758                         needs_mask = True;
2759                         mask_perms |= p_ace->perms;
2760                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2761                         mask_perms |= p_ace->perms;
2762                 }
2763
2764                 /*
2765                  * Get the entry for this ACE.
2766                  */
2767
2768                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2769                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2770                                 i, strerror(errno) ));
2771                         goto fail;
2772                 }
2773
2774                 if (p_ace->type == SMB_ACL_MASK) {
2775                         mask_entry = the_entry;
2776                         got_mask_entry = True;
2777                 }
2778
2779                 /*
2780                  * Ok - we now know the ACL calls should be working, don't
2781                  * allow fallback to chmod.
2782                  */
2783
2784                 *pacl_set_support = True;
2785
2786                 /*
2787                  * Initialise the entry from the canon_ace.
2788                  */
2789
2790                 /*
2791                  * First tell the entry what type of ACE this is.
2792                  */
2793
2794                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2795                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2796                                 i, strerror(errno) ));
2797                         goto fail;
2798                 }
2799
2800                 /*
2801                  * Only set the qualifier (user or group id) if the entry is a user
2802                  * or group id ACE.
2803                  */
2804
2805                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2806                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2807                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2808                                         i, strerror(errno) ));
2809                                 goto fail;
2810                         }
2811                 }
2812
2813                 /*
2814                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2815                  */
2816
2817                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2818                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2819                                 i, strerror(errno) ));
2820                         goto fail;
2821                 }
2822
2823                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2824                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2825                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2826                         goto fail;
2827                 }
2828
2829                 /*
2830                  * ..and apply them to the entry.
2831                  */
2832
2833                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2834                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2835                                 i, strerror(errno) ));
2836                         goto fail;
2837                 }
2838
2839                 if( DEBUGLVL( 10 ))
2840                         print_canon_ace( p_ace, i);
2841
2842         }
2843
2844         if (needs_mask && !got_mask_entry) {
2845                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2846                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2847                         goto fail;
2848                 }
2849
2850                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2851                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2852                         goto fail;
2853                 }
2854
2855                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2856                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2857                         goto fail;
2858                 }
2859
2860                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2861                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2862                         goto fail;
2863                 }
2864
2865                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2866                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2867                         goto fail;
2868                 }
2869         }
2870
2871         /*
2872          * Finally apply it to the file or directory.
2873          */
2874
2875         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2876                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2877                                              the_acl_type, the_acl) == -1) {
2878                         /*
2879                          * Some systems allow all the above calls and only fail with no ACL support
2880                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2881                          */
2882                         if (no_acl_syscall_error(errno)) {
2883                                 *pacl_set_support = False;
2884                         }
2885
2886                         if (acl_group_override(conn, fsp->fsp_name)) {
2887                                 int sret;
2888
2889                                 DEBUG(5,("set_canon_ace_list: acl group "
2890                                          "control on and current user in file "
2891                                          "%s primary group.\n",
2892                                          fsp_str_dbg(fsp)));
2893
2894                                 become_root();
2895                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2896                                     fsp->fsp_name->base_name, the_acl_type,
2897                                     the_acl);
2898                                 unbecome_root();
2899                                 if (sret == 0) {
2900                                         ret = True;
2901                                 }
2902                         }
2903
2904                         if (ret == False) {
2905                                 DEBUG(2,("set_canon_ace_list: "
2906                                          "sys_acl_set_file type %s failed for "
2907                                          "file %s (%s).\n",
2908                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2909                                          "directory default" : "file",
2910                                          fsp_str_dbg(fsp), strerror(errno)));
2911                                 goto fail;
2912                         }
2913                 }
2914         } else {
2915                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2916                         /*
2917                          * Some systems allow all the above calls and only fail with no ACL support
2918                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2919                          */
2920                         if (no_acl_syscall_error(errno)) {
2921                                 *pacl_set_support = False;
2922                         }
2923
2924                         if (acl_group_override(conn, fsp->fsp_name)) {
2925                                 int sret;
2926
2927                                 DEBUG(5,("set_canon_ace_list: acl group "
2928                                          "control on and current user in file "
2929                                          "%s primary group.\n",
2930                                          fsp_str_dbg(fsp)));
2931
2932                                 become_root();
2933                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2934                                 unbecome_root();
2935                                 if (sret == 0) {
2936                                         ret = True;
2937                                 }
2938                         }
2939
2940                         if (ret == False) {
2941                                 DEBUG(2,("set_canon_ace_list: "
2942                                          "sys_acl_set_file failed for file %s "
2943                                          "(%s).\n",
2944                                          fsp_str_dbg(fsp), strerror(errno)));
2945                                 goto fail;
2946                         }
2947                 }
2948         }
2949
2950         ret = True;
2951
2952   fail:
2953
2954         if (the_acl != NULL) {
2955                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2956         }
2957
2958         return ret;
2959 }
2960
2961 /****************************************************************************
2962  Find a particular canon_ace entry.
2963 ****************************************************************************/
2964
2965 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2966 {
2967         while (list) {
2968                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2969                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2970                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2971                         break;
2972                 list = list->next;
2973         }
2974         return list;
2975 }
2976
2977 /****************************************************************************
2978
2979 ****************************************************************************/
2980
2981 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2982 {
2983         SMB_ACL_ENTRY_T entry;
2984
2985         if (!the_acl)
2986                 return NULL;
2987         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2988                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2989                 return NULL;
2990         }
2991         return the_acl;
2992 }
2993
2994 /****************************************************************************
2995  Convert a canon_ace to a generic 3 element permission - if possible.
2996 ****************************************************************************/
2997
2998 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2999
3000 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3001 {
3002         int snum = SNUM(fsp->conn);
3003         size_t ace_count = count_canon_ace_list(file_ace_list);
3004         canon_ace *ace_p;
3005         canon_ace *owner_ace = NULL;
3006         canon_ace *group_ace = NULL;
3007         canon_ace *other_ace = NULL;
3008         mode_t and_bits;
3009         mode_t or_bits;
3010
3011         if (ace_count != 3) {
3012                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3013                          "entries for file %s to convert to posix perms.\n",
3014                          fsp_str_dbg(fsp)));
3015                 return False;
3016         }
3017
3018         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3019                 if (ace_p->owner_type == UID_ACE)
3020                         owner_ace = ace_p;
3021                 else if (ace_p->owner_type == GID_ACE)
3022                         group_ace = ace_p;
3023                 else if (ace_p->owner_type == WORLD_ACE)
3024                         other_ace = ace_p;
3025         }
3026
3027         if (!owner_ace || !group_ace || !other_ace) {
3028                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3029                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3030                 return False;
3031         }
3032
3033         *posix_perms = (mode_t)0;
3034
3035         *posix_perms |= owner_ace->perms;
3036         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3037         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3038         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3039         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3040         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3041         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3042
3043         /* The owner must have at least read access. */
3044
3045         *posix_perms |= S_IRUSR;
3046         if (fsp->is_directory)
3047                 *posix_perms |= (S_IWUSR|S_IXUSR);
3048
3049         /* If requested apply the masks. */
3050
3051         /* Get the initial bits to apply. */
3052
3053         if (fsp->is_directory) {
3054                 and_bits = lp_dir_security_mask(snum);
3055                 or_bits = lp_force_dir_security_mode(snum);
3056         } else {
3057                 and_bits = lp_security_mask(snum);
3058                 or_bits = lp_force_security_mode(snum);
3059         }
3060
3061         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3062
3063         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3064                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3065                   (int)group_ace->perms, (int)other_ace->perms,
3066                   (int)*posix_perms, fsp_str_dbg(fsp)));
3067
3068         return True;
3069 }
3070
3071 /****************************************************************************
3072   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3073   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3074   with CI|OI set so it is inherited and also applies to the directory.
3075   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3076 ****************************************************************************/
3077
3078 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3079 {
3080         size_t i, j;
3081
3082         for (i = 0; i < num_aces; i++) {
3083                 for (j = i+1; j < num_aces; j++) {
3084                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3085                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3086                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3087                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3088
3089                         /* We know the lower number ACE's are file entries. */
3090                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3091                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3092                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3093                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3094                                 (i_inh == j_inh) &&
3095                                 (i_flags_ni == 0) &&
3096                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3097                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3098                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3099                                 /*
3100                                  * W2K wants to have access allowed zero access ACE's
3101                                  * at the end of the list. If the mask is zero, merge
3102                                  * the non-inherited ACE onto the inherited ACE.
3103                                  */
3104
3105                                 if (nt_ace_list[i].access_mask == 0) {
3106                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3107                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3108                                         if (num_aces - i - 1 > 0)
3109                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3110                                                                 sizeof(struct security_ace));
3111
3112                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3113                                                 (unsigned int)i, (unsigned int)j ));
3114                                 } else {
3115                                         /*
3116                                          * These are identical except for the flags.
3117                                          * Merge the inherited ACE onto the non-inherited ACE.
3118                                          */
3119
3120                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3121                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3122                                         if (num_aces - j - 1 > 0)
3123                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3124                                                                 sizeof(struct security_ace));
3125
3126                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3127                                                 (unsigned int)j, (unsigned int)i ));
3128                                 }
3129                                 num_aces--;
3130                                 break;
3131                         }
3132                 }
3133         }
3134
3135         return num_aces;
3136 }
3137
3138 /*
3139  * Add or Replace ACE entry.
3140  * In some cases we need to add a specific ACE for compatibility reasons.
3141  * When doing that we must make sure we are not actually creating a duplicate
3142  * entry. So we need to search whether an ACE entry already exist and eventually
3143  * replacce the access mask, or add a completely new entry if none was found.
3144  *
3145  * This function assumes the array has enough space to add a new entry without
3146  * any reallocation of memory.
3147  */
3148
3149 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3150                                 const struct dom_sid *sid, enum security_ace_type type,
3151                                 uint32_t mask, uint8_t flags)
3152 {
3153         int i;
3154
3155         /* first search for a duplicate */
3156         for (i = 0; i < *num_aces; i++) {
3157                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3158                     (nt_ace_list[i].flags == flags)) break;
3159         }
3160
3161         if (i < *num_aces) { /* found */
3162                 nt_ace_list[i].type = type;
3163                 nt_ace_list[i].access_mask = mask;
3164                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3165                            i, sid_string_dbg(sid), flags));
3166                 return;
3167         }
3168
3169         /* not found, append it */
3170         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3171 }
3172
3173
3174 /****************************************************************************
3175  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3176  the space for the return elements and returns the size needed to return the
3177  security descriptor. This should be the only external function needed for
3178  the UNIX style get ACL.
3179 ****************************************************************************/
3180
3181 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3182                                       const char *name,
3183                                       const SMB_STRUCT_STAT *sbuf,
3184                                       struct pai_val *pal,
3185                                       SMB_ACL_T posix_acl,
3186                                       SMB_ACL_T def_acl,
3187                                       uint32_t security_info,
3188                                       struct security_descriptor **ppdesc)
3189 {
3190         struct dom_sid owner_sid;
3191         struct dom_sid group_sid;
3192         size_t sd_size = 0;
3193         struct security_acl *psa = NULL;
3194         size_t num_acls = 0;
3195         size_t num_def_acls = 0;
3196         size_t num_aces = 0;
3197         canon_ace *file_ace = NULL;
3198         canon_ace *dir_ace = NULL;
3199         struct security_ace *nt_ace_list = NULL;
3200         size_t num_profile_acls = 0;
3201         struct dom_sid orig_owner_sid;
3202         struct security_descriptor *psd = NULL;
3203         int i;
3204
3205         /*
3206          * Get the owner, group and world SIDs.
3207          */
3208
3209         create_file_sids(sbuf, &owner_sid, &group_sid);
3210
3211         if (lp_profile_acls(SNUM(conn))) {
3212                 /* For WXP SP1 the owner must be administrators. */
3213                 sid_copy(&orig_owner_sid, &owner_sid);
3214                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3215                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3216                 num_profile_acls = 3;
3217         }
3218
3219         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3220
3221                 /*
3222                  * In the optimum case Creator Owner and Creator Group would be used for
3223                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3224                  * would lead to usability problems under Windows: The Creator entries
3225                  * are only available in browse lists of directories and not for files;
3226                  * additionally the identity of the owning group couldn't be determined.
3227                  * We therefore use those identities only for Default ACLs.
3228                  */
3229
3230                 /* Create the canon_ace lists. */
3231                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3232                                             &owner_sid, &group_sid, pal,
3233                                             SMB_ACL_TYPE_ACCESS);
3234
3235                 /* We must have *some* ACLS. */
3236
3237                 if (count_canon_ace_list(file_ace) == 0) {
3238                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3239                         goto done;
3240                 }
3241
3242                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3243                         dir_ace = canonicalise_acl(conn, name, def_acl,
3244                                                    sbuf,
3245                                                    &global_sid_Creator_Owner,
3246                                                    &global_sid_Creator_Group,
3247                                                    pal, SMB_ACL_TYPE_DEFAULT);
3248                 }
3249
3250                 /*
3251                  * Create the NT ACE list from the canonical ace lists.
3252                  */
3253
3254                 {
3255                         canon_ace *ace;
3256                         enum security_ace_type nt_acl_type;
3257
3258                         if (nt4_compatible_acls() && dir_ace) {
3259                                 /*
3260                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3261                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3262                                  * remove entries from the Access ACL if the
3263                                  * corresponding Default ACL entries have also been
3264                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3265                                  * are exceptions. We can do nothing
3266                                  * intelligent if the Default ACL contains entries that
3267                                  * are not also contained in the Access ACL, so this
3268                                  * case will still fail under NT 4.
3269                                  */
3270
3271                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3272                                 if (ace && !ace->perms) {
3273                                         DLIST_REMOVE(dir_ace, ace);
3274                                         SAFE_FREE(ace);
3275
3276                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3277                                         if (ace && !ace->perms) {
3278                                                 DLIST_REMOVE(file_ace, ace);
3279                                                 SAFE_FREE(ace);
3280                                         }
3281                                 }
3282
3283                                 /*
3284                                  * WinNT doesn't usually have Creator Group
3285                                  * in browse lists, so we send this entry to
3286                                  * WinNT even if it contains no relevant
3287                                  * permissions. Once we can add
3288                                  * Creator Group to browse lists we can
3289                                  * re-enable this.
3290                                  */
3291
3292 #if 0
3293                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3294                                 if (ace && !ace->perms) {
3295                                         DLIST_REMOVE(dir_ace, ace);
3296                                         SAFE_FREE(ace);
3297                                 }
3298 #endif
3299
3300                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3301                                 if (ace && !ace->perms) {
3302                                         DLIST_REMOVE(file_ace, ace);
3303                                         SAFE_FREE(ace);
3304                                 }
3305                         }
3306
3307                         num_acls = count_canon_ace_list(file_ace);
3308                         num_def_acls = count_canon_ace_list(dir_ace);
3309
3310                         /* Allocate the ace list. */
3311                         if ((nt_ace_list = SMB_MALLOC_ARRAY(struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3312                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3313                                 goto done;
3314                         }
3315
3316                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3317
3318                         /*
3319                          * Create the NT ACE list from the canonical ace lists.
3320                          */
3321
3322                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3323                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3324                                                 &nt_acl_type,
3325                                                 ace->perms,
3326                                                 S_ISDIR(sbuf->st_ex_mode));
3327                                 init_sec_ace(&nt_ace_list[num_aces++],
3328                                         &ace->trustee,
3329                                         nt_acl_type,
3330                                         acc,
3331                                         ace->ace_flags);
3332                         }
3333
3334                         /* The User must have access to a profile share - even
3335                          * if we can't map the SID. */
3336                         if (lp_profile_acls(SNUM(conn))) {
3337                                 add_or_replace_ace(nt_ace_list, &num_aces,
3338                                                    &global_sid_Builtin_Users,
3339                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3340                                                    FILE_GENERIC_ALL, 0);
3341                         }
3342
3343                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3344                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3345                                                 &nt_acl_type,
3346                                                 ace->perms,
3347                                                 S_ISDIR(sbuf->st_ex_mode));
3348                                 init_sec_ace(&nt_ace_list[num_aces++],
3349                                         &ace->trustee,
3350                                         nt_acl_type,
3351                                         acc,
3352                                         ace->ace_flags |
3353                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3354                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3355                                         SEC_ACE_FLAG_INHERIT_ONLY);
3356                         }
3357
3358                         /* The User must have access to a profile share - even
3359                          * if we can't map the SID. */
3360                         if (lp_profile_acls(SNUM(conn))) {
3361                                 add_or_replace_ace(nt_ace_list, &num_aces,
3362                                                 &global_sid_Builtin_Users,
3363                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3364                                                 FILE_GENERIC_ALL,
3365                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3366                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3367                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3368                         }
3369
3370                         /*
3371                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3372                          * Win2K needs this to get the inheritance correct when replacing ACLs
3373                          * on a directory tree. Based on work by Jim @ IBM.
3374                          */
3375
3376                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3377
3378                         if (lp_profile_acls(SNUM(conn))) {
3379                                 for (i = 0; i < num_aces; i++) {
3380                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3381                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3382                                                                    &orig_owner_sid,
3383                                                                    nt_ace_list[i].type,
3384                                                                    nt_ace_list[i].access_mask,
3385                                                                    nt_ace_list[i].flags);
3386                                                 break;
3387                                         }
3388                                 }
3389                         }
3390                 }
3391
3392                 if (num_aces) {
3393                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3394                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3395                                 goto done;
3396                         }
3397                 }
3398         } /* security_info & SECINFO_DACL */
3399
3400         psd = make_standard_sec_desc( talloc_tos(),
3401                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3402                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3403                         psa,
3404                         &sd_size);
3405
3406         if(!psd) {
3407                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3408                 sd_size = 0;
3409                 goto done;
3410         }
3411
3412         /*
3413          * Windows 2000: The DACL_PROTECTED flag in the security
3414          * descriptor marks the ACL as non-inheriting, i.e., no
3415          * ACEs from higher level directories propagate to this
3416          * ACL. In the POSIX ACL model permissions are only
3417          * inherited at file create time, so ACLs never contain
3418          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3419          * flag doesn't seem to bother Windows NT.
3420          * Always set this if map acl inherit is turned off.
3421          */
3422         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3423                 psd->type |= SEC_DESC_DACL_PROTECTED;
3424         } else {
3425                 psd->type |= pal->sd_type;
3426         }
3427
3428         if (psd->dacl) {
3429                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3430         }
3431
3432         *ppdesc = psd;
3433
3434  done:
3435
3436         if (posix_acl) {
3437                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3438         }
3439         if (def_acl) {
3440                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3441         }
3442         free_canon_ace_list(file_ace);
3443         free_canon_ace_list(dir_ace);
3444         free_inherited_info(pal);
3445         SAFE_FREE(nt_ace_list);
3446
3447         return NT_STATUS_OK;
3448 }
3449
3450 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3451                            struct security_descriptor **ppdesc)
3452 {
3453         SMB_STRUCT_STAT sbuf;
3454         SMB_ACL_T posix_acl = NULL;
3455         struct pai_val *pal;
3456
3457         *ppdesc = NULL;
3458
3459         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3460                   fsp_str_dbg(fsp)));
3461
3462         /* can it happen that fsp_name == NULL ? */
3463         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3464                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3465                                         security_info, ppdesc);
3466         }
3467
3468         /* Get the stat struct for the owner info. */
3469         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3470                 return map_nt_error_from_unix(errno);
3471         }
3472
3473         /* Get the ACL from the fd. */
3474         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3475
3476         pal = fload_inherited_info(fsp);
3477
3478         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3479                                        &sbuf, pal, posix_acl, NULL,
3480                                        security_info, ppdesc);
3481 }
3482
3483 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3484                           uint32_t security_info, struct security_descriptor **ppdesc)
3485 {
3486         SMB_ACL_T posix_acl = NULL;
3487         SMB_ACL_T def_acl = NULL;
3488         struct pai_val *pal;
3489         struct smb_filename smb_fname;
3490         int ret;
3491
3492         *ppdesc = NULL;
3493
3494         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3495
3496         ZERO_STRUCT(smb_fname);
3497         smb_fname.base_name = discard_const_p(char, name);
3498
3499         /* Get the stat struct for the owner info. */
3500         if (lp_posix_pathnames()) {
3501                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3502         } else {
3503                 ret = SMB_VFS_STAT(conn, &smb_fname);
3504         }
3505
3506         if (ret == -1) {
3507                 return map_nt_error_from_unix(errno);
3508         }
3509
3510         /* Get the ACL from the path. */
3511         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3512
3513         /* If it's a directory get the default POSIX ACL. */
3514         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3515                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3516                 def_acl = free_empty_sys_acl(conn, def_acl);
3517         }
3518
3519         pal = load_inherited_info(conn, name);
3520
3521         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3522                                        posix_acl, def_acl, security_info,
3523                                        ppdesc);
3524 }
3525
3526 /****************************************************************************
3527  Try to chown a file. We will be able to chown it under the following conditions.
3528
3529   1) If we have root privileges, then it will just work.
3530   2) If we have SeRestorePrivilege we can change the user + group to any other user.
3531   3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3532   4) If we have write permission to the file and dos_filemodes is set
3533      then allow chown to the currently authenticated user.
3534 ****************************************************************************/
3535
3536 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3537 {
3538         NTSTATUS status;
3539
3540         if(!CAN_WRITE(fsp->conn)) {
3541                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3542         }
3543
3544         /* Case (1). */
3545         status = vfs_chown_fsp(fsp, uid, gid);
3546         if (NT_STATUS_IS_OK(status)) {
3547                 return status;
3548         }
3549
3550         /* Case (2) / (3) */
3551         if (lp_enable_privileges()) {
3552                 bool has_take_ownership_priv = security_token_has_privilege(
3553                                                 get_current_nttok(fsp->conn),
3554                                                 SEC_PRIV_TAKE_OWNERSHIP);
3555                 bool has_restore_priv = security_token_has_privilege(
3556                                                 get_current_nttok(fsp->conn),
3557                                                 SEC_PRIV_RESTORE);
3558
3559                 if (has_restore_priv) {
3560                         ; /* Case (2) */
3561                 } else if (has_take_ownership_priv) {
3562                         /* Case (3) */
3563                         if (uid == get_current_uid(fsp->conn)) {
3564                                 gid = (gid_t)-1;
3565                         } else {
3566                                 has_take_ownership_priv = false;
3567                         }
3568                 }
3569
3570                 if (has_take_ownership_priv || has_restore_priv) {
3571                         become_root();
3572                         status = vfs_chown_fsp(fsp, uid, gid);
3573                         unbecome_root();
3574                         return status;
3575                 }
3576         }
3577
3578         /* Case (4). */
3579         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3580                 return NT_STATUS_ACCESS_DENIED;
3581         }
3582
3583         /* only allow chown to the current user. This is more secure,
3584            and also copes with the case where the SID in a take ownership ACL is
3585            a local SID on the users workstation
3586         */
3587         if (uid != get_current_uid(fsp->conn)) {
3588                 return NT_STATUS_ACCESS_DENIED;
3589         }
3590
3591         become_root();
3592         /* Keep the current file gid the same. */
3593         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3594         unbecome_root();
3595
3596         return status;
3597 }
3598
3599 #if 0
3600 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3601
3602 /****************************************************************************
3603  Take care of parent ACL inheritance.
3604 ****************************************************************************/
3605
3606 NTSTATUS append_parent_acl(files_struct *fsp,
3607                                 const struct security_descriptor *pcsd,
3608                                 struct security_descriptor **pp_new_sd)
3609 {
3610         struct smb_filename *smb_dname = NULL;
3611         struct security_descriptor *parent_sd = NULL;
3612         files_struct *parent_fsp = NULL;
3613         TALLOC_CTX *mem_ctx = talloc_tos();
3614         char *parent_name = NULL;
3615         struct security_ace *new_ace = NULL;
3616         unsigned int num_aces = pcsd->dacl->num_aces;
3617         NTSTATUS status;
3618         int info;
3619         unsigned int i, j;
3620         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3621         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3622
3623         if (psd == NULL) {
3624                 return NT_STATUS_NO_MEMORY;
3625         }
3626
3627         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3628                             NULL)) {
3629                 return NT_STATUS_NO_MEMORY;
3630         }
3631
3632         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3633                                             &smb_dname);
3634         if (!NT_STATUS_IS_OK(status)) {
3635                 goto fail;
3636         }
3637
3638         status = SMB_VFS_CREATE_FILE(
3639                 fsp->conn,                              /* conn */
3640                 NULL,                                   /* req */
3641                 0,                                      /* root_dir_fid */
3642                 smb_dname,                              /* fname */
3643                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3644                 FILE_SHARE_NONE,                        /* share_access */
3645                 FILE_OPEN,                              /* create_disposition*/
3646                 FILE_DIRECTORY_FILE,                    /* create_options */
3647                 0,                                      /* file_attributes */
3648                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3649                 0,                                      /* allocation_size */
3650                 NULL,                                   /* sd */
3651                 NULL,                                   /* ea_list */
3652                 &parent_fsp,                            /* result */
3653                 &info);                                 /* pinfo */
3654
3655         if (!NT_STATUS_IS_OK(status)) {
3656                 TALLOC_FREE(smb_dname);
3657                 return status;
3658         }
3659
3660         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3661                                     SECINFO_DACL, &parent_sd );
3662
3663         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3664         TALLOC_FREE(smb_dname);
3665
3666         if (!NT_STATUS_IS_OK(status)) {
3667                 return status;
3668         }
3669
3670         /*
3671          * Make room for potentially all the ACLs from
3672          * the parent. We used to add the ugw triple here,
3673          * as we knew we were dealing with POSIX ACLs.
3674          * We no longer need to do so as we can guarentee
3675          * that a default ACL from the parent directory will
3676          * be well formed for POSIX ACLs if it came from a
3677          * POSIX ACL source, and if we're not writing to a
3678          * POSIX ACL sink then we don't care if it's not well
3679          * formed. JRA.
3680          */
3681
3682         num_aces += parent_sd->dacl->num_aces;
3683
3684         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, struct security_ace,
3685                                         num_aces)) == NULL) {
3686                 return NT_STATUS_NO_MEMORY;
3687         }
3688
3689         /* Start by copying in all the given ACE entries. */
3690         for (i = 0; i < psd->dacl->num_aces; i++) {
3691                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3692         }
3693
3694         /*
3695          * Note that we're ignoring "inherit permissions" here
3696          * as that really only applies to newly created files. JRA.
3697          */
3698
3699         /* Finally append any inherited ACEs. */
3700         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3701                 struct security_ace *se = &parent_sd->dacl->aces[j];
3702
3703                 if (fsp->is_directory) {
3704                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3705                                 /* Doesn't apply to a directory - ignore. */
3706                                 DEBUG(10,("append_parent_acl: directory %s "
3707                                         "ignoring non container "
3708                                         "inherit flags %u on ACE with sid %s "
3709                                         "from parent %s\n",
3710                                         fsp_str_dbg(fsp),
3711                                         (unsigned int)se->flags,
3712                                         sid_string_dbg(&se->trustee),
3713                                         parent_name));
3714                                 continue;
3715                         }
3716                 } else {
3717                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3718                                 /* Doesn't apply to a file - ignore. */
3719                                 DEBUG(10,("append_parent_acl: file %s "
3720                                         "ignoring non object "
3721                                         "inherit flags %u on ACE with sid %s "
3722                                         "from parent %s\n",
3723                                         fsp_str_dbg(fsp),
3724                                         (unsigned int)se->flags,
3725                                         sid_string_dbg(&se->trustee),
3726                                         parent_name));
3727                                 continue;
3728                         }
3729                 }
3730
3731                 if (is_dacl_protected) {
3732                         /* If the DACL is protected it means we must
3733                          * not overwrite an existing ACE entry with the
3734                          * same SID. This is order N^2. Ouch :-(. JRA. */
3735                         unsigned int k;
3736                         for (k = 0; k < psd->dacl->num_aces; k++) {
3737                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3738                                                 &se->trustee)) {
3739                                         break;
3740                                 }
3741                         }
3742                         if (k < psd->dacl->num_aces) {
3743                                 /* SID matched. Ignore. */
3744                                 DEBUG(10,("append_parent_acl: path %s "
3745                                         "ignoring ACE with protected sid %s "
3746                                         "from parent %s\n",
3747                                         fsp_str_dbg(fsp),
3748                                         sid_string_dbg(&se->trustee),
3749                                         parent_name));
3750                                 continue;
3751                         }
3752                 }
3753
3754                 sec_ace_copy(&new_ace[i], se);
3755                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3756                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3757                 }
3758                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3759
3760                 if (fsp->is_directory) {
3761                         /*
3762                          * Strip off any inherit only. It's applied.
3763                          */
3764                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3765                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3766                                 /* No further inheritance. */
3767                                 new_ace[i].flags &=
3768                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3769                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3770                         }
3771                 } else {
3772                         /*
3773                          * Strip off any container or inherit
3774                          * flags, they can't apply to objects.
3775                          */
3776                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3777                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3778                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3779                 }
3780                 i++;
3781
3782                 DEBUG(10,("append_parent_acl: path %s "
3783                         "inheriting ACE with sid %s "
3784                         "from parent %s\n",
3785                         fsp_str_dbg(fsp),
3786                         sid_string_dbg(&se->trustee),
3787                         parent_name));
3788         }
3789
3790         psd->dacl->aces = new_ace;
3791         psd->dacl->num_aces = i;
3792         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3793                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
3794
3795         *pp_new_sd = psd;
3796         return status;
3797 }
3798 #endif
3799
3800 /****************************************************************************
3801  Reply to set a security descriptor on an fsp. security_info_sent is the
3802  description of the following NT ACL.
3803  This should be the only external function needed for the UNIX style set ACL.
3804  We make a copy of psd_orig as internal functions modify the elements inside
3805  it, even though it's a const pointer.
3806 ****************************************************************************/
3807
3808 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3809 {
3810         connection_struct *conn = fsp->conn;
3811         uid_t user = (uid_t)-1;
3812         gid_t grp = (gid_t)-1;
3813         struct dom_sid file_owner_sid;
3814         struct dom_sid file_grp_sid;
3815         canon_ace *file_ace_list = NULL;
3816         canon_ace *dir_ace_list = NULL;
3817         bool acl_perms = False;
3818         mode_t orig_mode = (mode_t)0;
3819         NTSTATUS status;
3820         bool set_acl_as_root = false;
3821         bool acl_set_support = false;
3822         bool ret = false;
3823         struct security_descriptor *psd = NULL;
3824
3825         DEBUG(10,("set_nt_acl: called for file %s\n",
3826                   fsp_str_dbg(fsp)));
3827
3828         if (!CAN_WRITE(conn)) {
3829                 DEBUG(10,("set acl rejected on read-only share\n"));
3830                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3831         }
3832
3833         if (!psd_orig) {
3834                 return NT_STATUS_INVALID_PARAMETER;
3835         }
3836
3837         psd = dup_sec_desc(talloc_tos(), psd_orig);
3838         if (!psd) {
3839                 return NT_STATUS_NO_MEMORY;
3840         }
3841
3842         /*
3843          * Get the current state of the file.
3844          */
3845
3846         status = vfs_stat_fsp(fsp);
3847         if (!NT_STATUS_IS_OK(status)) {
3848                 return status;
3849         }
3850
3851         /* Save the original element we check against. */
3852         orig_mode = fsp->fsp_name->st.st_ex_mode;
3853
3854         /*
3855          * Unpack the user/group/world id's.
3856          */
3857
3858         /* POSIX can't cope with missing owner/group. */
3859         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3860                 security_info_sent &= ~SECINFO_OWNER;
3861         }
3862         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3863                 security_info_sent &= ~SECINFO_GROUP;
3864         }
3865
3866         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3867         if (!NT_STATUS_IS_OK(status)) {
3868                 return status;
3869         }
3870
3871         /*
3872          * Do we need to chown ? If so this must be done first as the incoming
3873          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3874          * Noticed by Simo.
3875          */
3876
3877         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3878             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3879
3880                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3881                          fsp_str_dbg(fsp), (unsigned int)user,
3882                          (unsigned int)grp));
3883
3884                 status = try_chown(fsp, user, grp);
3885                 if(!NT_STATUS_IS_OK(status)) {
3886                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3887                                 "= %s.\n", fsp_str_dbg(fsp),
3888                                 (unsigned int)user,
3889                                 (unsigned int)grp,
3890                                 nt_errstr(status)));
3891                         return status;
3892                 }
3893
3894                 /*
3895                  * Recheck the current state of the file, which may have changed.
3896                  * (suid/sgid bits, for instance)
3897                  */
3898
3899                 status = vfs_stat_fsp(fsp);
3900                 if (!NT_STATUS_IS_OK(status)) {
3901                         return status;
3902                 }
3903
3904                 /* Save the original element we check against. */
3905                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3906
3907                 /* If we successfully chowned, we know we must
3908                  * be able to set the acl, so do it as root.
3909                  */
3910                 set_acl_as_root = true;
3911         }
3912
3913         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3914
3915         if((security_info_sent & SECINFO_DACL) &&
3916                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3917                         (psd->dacl == NULL)) {
3918                 struct security_ace ace[3];
3919
3920                 /* We can't have NULL DACL in POSIX.
3921                    Use owner/group/Everyone -> full access. */
3922
3923                 init_sec_ace(&ace[0],
3924                                 &file_owner_sid,
3925                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3926                                 GENERIC_ALL_ACCESS,
3927                                 0);
3928                 init_sec_ace(&ace[1],
3929                                 &file_grp_sid,
3930                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3931                                 GENERIC_ALL_ACCESS,
3932                                 0);
3933                 init_sec_ace(&ace[2],
3934                                 &global_sid_World,
3935                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3936                                 GENERIC_ALL_ACCESS,
3937                                 0);
3938                 psd->dacl = make_sec_acl(talloc_tos(),
3939                                         NT4_ACL_REVISION,
3940                                         3,
3941                                         ace);
3942                 if (psd->dacl == NULL) {
3943                         return NT_STATUS_NO_MEMORY;
3944                 }
3945                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3946         }
3947
3948         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3949                                      &file_grp_sid, &file_ace_list,
3950                                      &dir_ace_list, security_info_sent, psd);
3951
3952         /* Ignore W2K traverse DACL set. */
3953         if (!file_ace_list && !dir_ace_list) {
3954                 return NT_STATUS_OK;
3955         }
3956
3957         if (!acl_perms) {
3958                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3959                 free_canon_ace_list(file_ace_list);
3960                 free_canon_ace_list(dir_ace_list);
3961                 return NT_STATUS_ACCESS_DENIED;
3962         }
3963
3964         /*
3965          * Only change security if we got a DACL.
3966          */
3967
3968         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3969                 free_canon_ace_list(file_ace_list);
3970                 free_canon_ace_list(dir_ace_list);
3971                 return NT_STATUS_OK;
3972         }
3973
3974         /*
3975          * Try using the POSIX ACL set first. Fall back to chmod if
3976          * we have no ACL support on this filesystem.
3977          */
3978
3979         if (acl_perms && file_ace_list) {
3980                 if (set_acl_as_root) {
3981                         become_root();
3982                 }
3983                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3984                                          &fsp->fsp_name->st, &acl_set_support);
3985                 if (set_acl_as_root) {
3986                         unbecome_root();
3987                 }
3988                 if (acl_set_support && ret == false) {
3989                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3990                                  "%s (%s).\n", fsp_str_dbg(fsp),
3991                                  strerror(errno)));
3992                         free_canon_ace_list(file_ace_list);
3993                         free_canon_ace_list(dir_ace_list);
3994                         return map_nt_error_from_unix(errno);
3995                 }
3996         }
3997
3998         if (acl_perms && acl_set_support && fsp->is_directory) {
3999                 if (dir_ace_list) {
4000                         if (set_acl_as_root) {
4001                                 become_root();
4002                         }
4003                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
4004                                                  &fsp->fsp_name->st,
4005                                                  &acl_set_support);
4006                         if (set_acl_as_root) {
4007                                 unbecome_root();
4008                         }
4009                         if (ret == false) {
4010                                 DEBUG(3,("set_nt_acl: failed to set default "
4011                                          "acl on directory %s (%s).\n",
4012                                          fsp_str_dbg(fsp), strerror(errno)));
4013                                 free_canon_ace_list(file_ace_list);
4014                                 free_canon_ace_list(dir_ace_list);
4015                                 return map_nt_error_from_unix(errno);
4016                         }
4017                 } else {
4018                         int sret = -1;
4019
4020                         /*
4021                          * No default ACL - delete one if it exists.
4022                          */
4023
4024                         if (set_acl_as_root) {
4025                                 become_root();
4026                         }
4027                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4028                             fsp->fsp_name->base_name);
4029                         if (set_acl_as_root) {
4030                                 unbecome_root();
4031                         }
4032                         if (sret == -1) {
4033                                 if (acl_group_override(conn, fsp->fsp_name)) {
4034                                         DEBUG(5,("set_nt_acl: acl group "
4035                                                  "control on and current user "
4036                                                  "in file %s primary group. "
4037                                                  "Override delete_def_acl\n",
4038                                                  fsp_str_dbg(fsp)));
4039
4040                                         become_root();
4041                                         sret =
4042                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4043                                                     conn,
4044                                                     fsp->fsp_name->base_name);
4045                                         unbecome_root();
4046                                 }
4047
4048                                 if (sret == -1) {
4049                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4050                                         free_canon_ace_list(file_ace_list);
4051                                         free_canon_ace_list(dir_ace_list);
4052                                         return map_nt_error_from_unix(errno);
4053                                 }
4054                         }
4055                 }
4056         }
4057
4058         if (acl_set_support) {
4059                 if (set_acl_as_root) {
4060                         become_root();
4061                 }
4062                 store_inheritance_attributes(fsp,
4063                                 file_ace_list,
4064                                 dir_ace_list,
4065                                 psd->type);
4066                 if (set_acl_as_root) {
4067                         unbecome_root();
4068                 }
4069         }
4070
4071         /*
4072          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4073          */
4074
4075         if(!acl_set_support && acl_perms) {
4076                 mode_t posix_perms;
4077
4078                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4079                         free_canon_ace_list(file_ace_list);
4080                         free_canon_ace_list(dir_ace_list);
4081                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4082                                  "posix permissions for file %s.\n",
4083                                  fsp_str_dbg(fsp)));
4084                         return NT_STATUS_ACCESS_DENIED;
4085                 }
4086
4087                 if (orig_mode != posix_perms) {
4088                         int sret = -1;
4089
4090                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4091                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4092
4093                         if (set_acl_as_root) {
4094                                 become_root();
4095                         }
4096                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4097                                              posix_perms);
4098                         if (set_acl_as_root) {
4099                                 unbecome_root();
4100                         }
4101                         if(sret == -1) {
4102                                 if (acl_group_override(conn, fsp->fsp_name)) {
4103                                         DEBUG(5,("set_nt_acl: acl group "
4104                                                  "control on and current user "
4105                                                  "in file %s primary group. "
4106                                                  "Override chmod\n",
4107                                                  fsp_str_dbg(fsp)));
4108
4109                                         become_root();
4110                                         sret = SMB_VFS_CHMOD(conn,
4111                                             fsp->fsp_name->base_name,
4112                                             posix_perms);
4113                                         unbecome_root();
4114                                 }
4115
4116                                 if (sret == -1) {
4117                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4118                                                  "failed. Error = %s.\n",
4119                                                  fsp_str_dbg(fsp),
4120                                                  (unsigned int)posix_perms,
4121                                                  strerror(errno)));
4122                                         free_canon_ace_list(file_ace_list);
4123                                         free_canon_ace_list(dir_ace_list);
4124                                         return map_nt_error_from_unix(errno);
4125                                 }
4126                         }
4127                 }
4128         }
4129
4130         free_canon_ace_list(file_ace_list);
4131         free_canon_ace_list(dir_ace_list);
4132
4133         /* Ensure the stat struct in the fsp is correct. */
4134         status = vfs_stat_fsp(fsp);
4135
4136         return NT_STATUS_OK;
4137 }
4138
4139 /****************************************************************************
4140  Get the actual group bits stored on a file with an ACL. Has no effect if
4141  the file has no ACL. Needed in dosmode code where the stat() will return
4142  the mask bits, not the real group bits, for a file with an ACL.
4143 ****************************************************************************/
4144
4145 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4146 {
4147         int entry_id = SMB_ACL_FIRST_ENTRY;
4148         SMB_ACL_ENTRY_T entry;
4149         SMB_ACL_T posix_acl;
4150         int result = -1;
4151
4152         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4153         if (posix_acl == (SMB_ACL_T)NULL)
4154                 return -1;
4155
4156         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4157                 SMB_ACL_TAG_T tagtype;
4158                 SMB_ACL_PERMSET_T permset;
4159
4160                 entry_id = SMB_ACL_NEXT_ENTRY;
4161
4162                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4163                         break;
4164
4165                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4166                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4167                                 break;
4168                         } else {
4169                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4170                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4171                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4172                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4173                                 result = 0;
4174                                 break;
4175                         }
4176                 }
4177         }
4178         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4179         return result;
4180 }
4181
4182 /****************************************************************************
4183  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4184  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4185 ****************************************************************************/
4186
4187 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4188 {
4189         int entry_id = SMB_ACL_FIRST_ENTRY;
4190         SMB_ACL_ENTRY_T entry;
4191         int num_entries = 0;
4192
4193         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4194                 SMB_ACL_TAG_T tagtype;
4195                 SMB_ACL_PERMSET_T permset;
4196                 mode_t perms;
4197
4198                 entry_id = SMB_ACL_NEXT_ENTRY;
4199
4200                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4201                         return -1;
4202
4203                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4204                         return -1;
4205
4206                 num_entries++;
4207
4208                 switch(tagtype) {
4209                         case SMB_ACL_USER_OBJ:
4210                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4211                                 break;
4212                         case SMB_ACL_GROUP_OBJ:
4213                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4214                                 break;
4215                         case SMB_ACL_MASK:
4216                                 /*
4217                                  * FIXME: The ACL_MASK entry permissions should really be set to
4218                                  * the union of the permissions of all ACL_USER,
4219                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4220                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4221                                  */
4222                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4223                                 break;
4224                         case SMB_ACL_OTHER:
4225                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4226                                 break;
4227                         default:
4228                                 continue;
4229                 }
4230
4231                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4232                         return -1;
4233
4234                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4235                         return -1;
4236         }
4237
4238         /*
4239          * If this is a simple 3 element ACL or no elements then it's a standard
4240          * UNIX permission set. Just use chmod...
4241          */
4242
4243         if ((num_entries == 3) || (num_entries == 0))
4244                 return -1;
4245
4246         return 0;
4247 }
4248
4249 /****************************************************************************
4250  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4251  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4252  resulting ACL on TO.  Note that name is in UNIX character set.
4253 ****************************************************************************/
4254
4255 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4256 {
4257         SMB_ACL_T posix_acl = NULL;
4258         int ret = -1;
4259
4260         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4261                 return -1;
4262
4263         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4264                 goto done;
4265
4266         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4267
4268  done:
4269
4270         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4271         return ret;
4272 }
4273
4274 /****************************************************************************
4275  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4276  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4277  Note that name is in UNIX character set.
4278 ****************************************************************************/
4279
4280 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4281 {
4282         return copy_access_posix_acl(conn, name, name, mode);
4283 }
4284
4285 /****************************************************************************
4286  Check for an existing default POSIX ACL on a directory.
4287 ****************************************************************************/
4288
4289 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4290 {
4291         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4292         bool has_acl = False;
4293         SMB_ACL_ENTRY_T entry;
4294
4295         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4296                 has_acl = True;
4297         }
4298
4299         if (def_acl) {
4300                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4301         }
4302         return has_acl;
4303 }
4304
4305 /****************************************************************************
4306  If the parent directory has no default ACL but it does have an Access ACL,
4307  inherit this Access ACL to file name.
4308 ****************************************************************************/
4309
4310 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4311                        const char *name, mode_t mode)
4312 {
4313         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4314                 return 0;
4315
4316         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4317 }
4318
4319 /****************************************************************************
4320  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4321  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4322 ****************************************************************************/
4323
4324 int fchmod_acl(files_struct *fsp, mode_t mode)
4325 {
4326         connection_struct *conn = fsp->conn;
4327         SMB_ACL_T posix_acl = NULL;
4328         int ret = -1;
4329
4330         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4331                 return -1;
4332
4333         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4334                 goto done;
4335
4336         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4337
4338   done:
4339
4340         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4341         return ret;
4342 }
4343
4344 /****************************************************************************
4345  Map from wire type to permset.
4346 ****************************************************************************/
4347
4348 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4349 {
4350         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4351                 return False;
4352         }
4353
4354         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4355                 return False;
4356         }
4357
4358         if (wire_perm & SMB_POSIX_ACL_READ) {
4359                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4360                         return False;
4361                 }
4362         }
4363         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4364                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4365                         return False;
4366                 }
4367         }
4368         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4369                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4370                         return False;
4371                 }
4372         }
4373         return True;
4374 }
4375
4376 /****************************************************************************
4377  Map from wire type to tagtype.
4378 ****************************************************************************/
4379
4380 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4381 {
4382         switch (wire_tt) {
4383                 case SMB_POSIX_ACL_USER_OBJ:
4384                         *p_tt = SMB_ACL_USER_OBJ;
4385                         break;
4386                 case SMB_POSIX_ACL_USER:
4387                         *p_tt = SMB_ACL_USER;
4388                         break;
4389                 case SMB_POSIX_ACL_GROUP_OBJ:
4390                         *p_tt = SMB_ACL_GROUP_OBJ;
4391                         break;
4392                 case SMB_POSIX_ACL_GROUP:
4393                         *p_tt = SMB_ACL_GROUP;
4394                         break;
4395                 case SMB_POSIX_ACL_MASK:
4396                         *p_tt = SMB_ACL_MASK;
4397                         break;
4398                 case SMB_POSIX_ACL_OTHER:
4399                         *p_tt = SMB_ACL_OTHER;
4400                         break;
4401                 default:
4402                         return False;
4403         }
4404         return True;
4405 }
4406
4407 /****************************************************************************
4408  Create a new POSIX acl from wire permissions.
4409  FIXME ! How does the share mask/mode fit into this.... ?
4410 ****************************************************************************/
4411
4412 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4413 {
4414         unsigned int i;
4415         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4416
4417         if (the_acl == NULL) {
4418                 return NULL;
4419         }
4420
4421         for (i = 0; i < num_acls; i++) {
4422                 SMB_ACL_ENTRY_T the_entry;
4423                 SMB_ACL_PERMSET_T the_permset;
4424                 SMB_ACL_TAG_T tag_type;
4425
4426                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4427                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4428                                 i, strerror(errno) ));
4429                         goto fail;
4430                 }
4431
4432                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4433                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4434                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4435                         goto fail;
4436                 }
4437
4438                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4439                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4440                                 i, strerror(errno) ));
4441                         goto fail;
4442                 }
4443
4444                 /* Get the permset pointer from the new ACL entry. */
4445                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4446                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4447                                 i, strerror(errno) ));
4448                         goto fail;
4449                 }
4450
4451                 /* Map from wire to permissions. */
4452                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4453                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4454                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4455                         goto fail;
4456                 }
4457
4458                 /* Now apply to the new ACL entry. */
4459                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4460                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4461                                 i, strerror(errno) ));
4462                         goto fail;
4463                 }
4464
4465                 if (tag_type == SMB_ACL_USER) {
4466                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4467                         uid_t uid = (uid_t)uidval;
4468                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4469                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4470                                         (unsigned int)uid, i, strerror(errno) ));
4471                                 goto fail;
4472                         }
4473                 }
4474
4475                 if (tag_type == SMB_ACL_GROUP) {
4476                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4477                         gid_t gid = (uid_t)gidval;
4478                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4479                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4480                                         (unsigned int)gid, i, strerror(errno) ));
4481                                 goto fail;
4482                         }
4483                 }
4484         }
4485
4486         return the_acl;
4487
4488  fail:
4489
4490         if (the_acl != NULL) {
4491                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4492         }
4493         return NULL;
4494 }
4495
4496 /****************************************************************************
4497  Calls from UNIX extensions - Default POSIX ACL set.
4498  If num_def_acls == 0 and not a directory just return. If it is a directory
4499  and num_def_acls == 0 then remove the default acl. Else set the default acl
4500  on the directory.
4501 ****************************************************************************/
4502
4503 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4504                                 uint16 num_def_acls, const char *pdata)
4505 {
4506         SMB_ACL_T def_acl = NULL;
4507
4508         if (!S_ISDIR(psbuf->st_ex_mode)) {
4509                 if (num_def_acls) {
4510                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4511                         errno = EISDIR;
4512                         return False;
4513                 } else {
4514                         return True;
4515                 }
4516         }
4517
4518         if (!num_def_acls) {
4519                 /* Remove the default ACL. */
4520                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4521                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4522                                 fname, strerror(errno) ));
4523                         return False;
4524                 }
4525                 return True;
4526         }
4527
4528         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4529                 return False;
4530         }
4531
4532         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4533                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4534                         fname, strerror(errno) ));
4535                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4536                 return False;
4537         }
4538
4539         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4540         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4541         return True;
4542 }
4543
4544 /****************************************************************************
4545  Remove an ACL from a file. As we don't have acl_delete_entry() available
4546  we must read the current acl and copy all entries except MASK, USER and GROUP
4547  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4548  removed.
4549  FIXME ! How does the share mask/mode fit into this.... ?
4550 ****************************************************************************/
4551
4552 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4553 {
4554         SMB_ACL_T file_acl = NULL;
4555         int entry_id = SMB_ACL_FIRST_ENTRY;
4556         SMB_ACL_ENTRY_T entry;
4557         bool ret = False;
4558         /* Create a new ACL with only 3 entries, u/g/w. */
4559         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4560         SMB_ACL_ENTRY_T user_ent = NULL;
4561         SMB_ACL_ENTRY_T group_ent = NULL;
4562         SMB_ACL_ENTRY_T other_ent = NULL;
4563
4564         if (new_file_acl == NULL) {
4565                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4566                 return False;
4567         }
4568
4569         /* Now create the u/g/w entries. */
4570         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4571                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4572                         fname, strerror(errno) ));
4573                 goto done;
4574         }
4575         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4576                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4577                         fname, strerror(errno) ));
4578                 goto done;
4579         }
4580
4581         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4582                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4583                         fname, strerror(errno) ));
4584                 goto done;
4585         }
4586         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4587                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4588                         fname, strerror(errno) ));
4589                 goto done;
4590         }
4591
4592         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4593                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4594                         fname, strerror(errno) ));
4595                 goto done;
4596         }
4597         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4598                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4599                         fname, strerror(errno) ));
4600                 goto done;
4601         }
4602
4603         /* Get the current file ACL. */
4604         if (fsp && fsp->fh->fd != -1) {
4605                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4606         } else {
4607                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4608         }
4609
4610         if (file_acl == NULL) {
4611                 /* This is only returned if an error occurred. Even for a file with
4612                    no acl a u/g/w acl should be returned. */
4613                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4614                         fname, strerror(errno) ));
4615                 goto done;
4616         }
4617
4618         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4619                 SMB_ACL_TAG_T tagtype;
4620                 SMB_ACL_PERMSET_T permset;
4621
4622                 entry_id = SMB_ACL_NEXT_ENTRY;
4623
4624                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4625                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4626                                 fname, strerror(errno) ));
4627                         goto done;
4628                 }
4629
4630                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4631                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4632                                 fname, strerror(errno) ));
4633                         goto done;
4634                 }
4635
4636                 if (tagtype == SMB_ACL_USER_OBJ) {
4637                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4638                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4639                                         fname, strerror(errno) ));
4640                         }
4641                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4642                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4643                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4644                                         fname, strerror(errno) ));
4645                         }
4646                 } else if (tagtype == SMB_ACL_OTHER) {
4647                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4648                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4649                                         fname, strerror(errno) ));
4650                         }
4651                 }
4652         }
4653
4654         /* Set the new empty file ACL. */
4655         if (fsp && fsp->fh->fd != -1) {
4656                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4657                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4658                                 fname, strerror(errno) ));
4659                         goto done;
4660                 }
4661         } else {
4662                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4663                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4664                                 fname, strerror(errno) ));
4665                         goto done;
4666                 }
4667         }
4668
4669         ret = True;
4670
4671  done:
4672
4673         if (file_acl) {
4674                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4675         }
4676         if (new_file_acl) {
4677                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4678         }
4679         return ret;
4680 }
4681
4682 /****************************************************************************
4683  Calls from UNIX extensions - POSIX ACL set.
4684  If num_def_acls == 0 then read/modify/write acl after removing all entries
4685  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4686 ****************************************************************************/
4687
4688 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4689 {
4690         SMB_ACL_T file_acl = NULL;
4691
4692         if (!num_acls) {
4693                 /* Remove the ACL from the file. */
4694                 return remove_posix_acl(conn, fsp, fname);
4695         }
4696
4697         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4698                 return False;
4699         }
4700
4701         if (fsp && fsp->fh->fd != -1) {
4702                 /* The preferred way - use an open fd. */
4703                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4704                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4705                                 fname, strerror(errno) ));
4706                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4707                         return False;
4708                 }
4709         } else {
4710                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4711                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4712                                 fname, strerror(errno) ));
4713                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4714                         return False;
4715                 }
4716         }
4717
4718         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4719         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4720         return True;
4721 }
4722
4723 /********************************************************************
4724  Pull the NT ACL from a file on disk or the OpenEventlog() access
4725  check.  Caller is responsible for freeing the returned security
4726  descriptor via TALLOC_FREE().  This is designed for dealing with
4727  user space access checks in smbd outside of the VFS.  For example,
4728  checking access rights in OpenEventlog().
4729
4730  Assume we are dealing with files (for now)
4731 ********************************************************************/
4732
4733 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4734 {
4735         struct security_descriptor *psd, *ret_sd;
4736         connection_struct *conn;
4737         files_struct finfo;
4738         struct fd_handle fh;
4739         NTSTATUS status;
4740
4741         conn = TALLOC_ZERO_P(ctx, connection_struct);
4742         if (conn == NULL) {
4743                 DEBUG(0, ("talloc failed\n"));
4744                 return NULL;
4745         }
4746
4747         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4748                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4749                 TALLOC_FREE(conn);
4750                 return NULL;
4751         }
4752
4753         conn->params->service = -1;
4754
4755         set_conn_connectpath(conn, "/");
4756
4757         if (!smbd_vfs_init(conn)) {
4758                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4759                 conn_free(conn);
4760                 return NULL;
4761         }
4762
4763         ZERO_STRUCT( finfo );
4764         ZERO_STRUCT( fh );
4765
4766         finfo.fnum = -1;
4767         finfo.conn = conn;
4768         finfo.fh = &fh;
4769         finfo.fh->fd = -1;
4770
4771         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4772                                             &finfo.fsp_name);
4773         if (!NT_STATUS_IS_OK(status)) {
4774                 conn_free(conn);
4775                 return NULL;
4776         }
4777
4778         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4779                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4780                 TALLOC_FREE(finfo.fsp_name);
4781                 conn_free(conn);
4782                 return NULL;
4783         }
4784
4785         ret_sd = dup_sec_desc( ctx, psd );
4786
4787         TALLOC_FREE(finfo.fsp_name);
4788         conn_free(conn);
4789
4790         return ret_sd;
4791 }
4792
4793 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4794
4795 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4796                                         const char *name,
4797                                         SMB_STRUCT_STAT *psbuf,
4798                                         struct security_descriptor **ppdesc)
4799 {
4800         struct dom_sid owner_sid, group_sid;
4801         size_t size = 0;
4802         struct security_ace aces[4];
4803         uint32_t access_mask = 0;
4804         mode_t mode = psbuf->st_ex_mode;
4805         struct security_acl *new_dacl = NULL;
4806         int idx = 0;
4807
4808         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4809                 name, (int)mode ));
4810
4811         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4812         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4813
4814         /*
4815          We provide up to 4 ACEs
4816                 - Owner
4817                 - Group
4818                 - Everyone
4819                 - NT System
4820         */
4821
4822         if (mode & S_IRUSR) {
4823                 if (mode & S_IWUSR) {
4824                         access_mask |= SEC_RIGHTS_FILE_ALL;
4825                 } else {
4826                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4827                 }
4828         }
4829         if (mode & S_IWUSR) {
4830                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4831         }
4832
4833         init_sec_ace(&aces[idx],
4834                         &owner_sid,
4835                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4836                         access_mask,
4837                         0);
4838         idx++;
4839
4840         access_mask = 0;
4841         if (mode & S_IRGRP) {
4842                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4843         }
4844         if (mode & S_IWGRP) {
4845                 /* note that delete is not granted - this matches posix behaviour */
4846                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4847         }
4848         if (access_mask) {
4849                 init_sec_ace(&aces[idx],
4850                         &group_sid,
4851                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4852                         access_mask,
4853                         0);
4854                 idx++;
4855         }
4856
4857         access_mask = 0;
4858         if (mode & S_IROTH) {
4859                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4860         }
4861         if (mode & S_IWOTH) {
4862                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4863         }
4864         if (access_mask) {
4865                 init_sec_ace(&aces[idx],
4866                         &global_sid_World,
4867                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4868                         access_mask,
4869                         0);
4870                 idx++;
4871         }
4872
4873         init_sec_ace(&aces[idx],
4874                         &global_sid_System,
4875                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4876                         SEC_RIGHTS_FILE_ALL,
4877                         0);
4878         idx++;
4879
4880         new_dacl = make_sec_acl(ctx,
4881                         NT4_ACL_REVISION,
4882                         idx,
4883                         aces);
4884
4885         if (!new_dacl) {
4886                 return NT_STATUS_NO_MEMORY;
4887         }
4888
4889         *ppdesc = make_sec_desc(ctx,
4890                         SECURITY_DESCRIPTOR_REVISION_1,
4891                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4892                         &owner_sid,
4893                         &group_sid,
4894                         NULL,
4895                         new_dacl,
4896                         &size);
4897         if (!*ppdesc) {
4898                 return NT_STATUS_NO_MEMORY;
4899         }
4900         return NT_STATUS_OK;
4901 }