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 "smbd/smbd.h"
  24 #include "system/filesys.h"
  25 #include "../libcli/security/security.h"
  26 #include "trans2.h"
  27 #include "passdb/lookup_sid.h"
  28 #include "auth.h"
  29 #include "../librpc/gen_ndr/idmap.h"
  30 #include "lib/param/loadparm.h"
  31
  32 extern const struct generic_mapping file_generic_mapping;
  33
  34 #undef  DBGC_CLASS
  35 #define DBGC_CLASS DBGC_ACLS
  36
  37 /****************************************************************************
  38  Data structures representing the internal ACE format.
  39 ****************************************************************************/
  40
  41 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  42 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  43
  44 typedef struct canon_ace {
  45         struct canon_ace *next, *prev;
  46         SMB_ACL_TAG_T type;
  47         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  48         struct dom_sid trustee;
  49         enum ace_owner owner_type;
  50         enum ace_attribute attr;
  51         struct unixid unix_ug;
  52         uint8_t ace_flags; /* From windows ACE entry. */
  53 } canon_ace;
  54
  55 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  56
  57 /*
  58  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  59  * attribute on disk - version 1.
  60  * All values are little endian.
  61  *
  62  * |  1   |  1   |   2         |         2           |  ....
  63  * +------+------+-------------+---------------------+-------------+--------------------+
  64  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  65  * +------+------+-------------+---------------------+-------------+--------------------+
  66  *
  67  * Entry format is :
  68  *
  69  * |  1   |       4           |
  70  * +------+-------------------+
  71  * | value|  uid/gid or world |
  72  * | type |  value            |
  73  * +------+-------------------+
  74  *
  75  * Version 2 format. Stores extra Windows metadata about an ACL.
  76  *
  77  * |  1   |  2       |   2         |         2           |  ....
  78  * +------+----------+-------------+---------------------+-------------+--------------------+
  79  * | vers | ace      | num_entries | num_default_entries | ..entries.. | default_entries... |
  80  * |   2  |  type    |             |                     |             |                    |
  81  * +------+----------+-------------+---------------------+-------------+--------------------+
  82  *
  83  * Entry format is :
  84  *
  85  * |  1   |  1   |       4           |
  86  * +------+------+-------------------+
  87  * | ace  | value|  uid/gid or world |
  88  * | flag | type |  value            |
  89  * +------+-------------------+------+
  90  *
  91  */
  92
  93 #define PAI_VERSION_OFFSET                      0
  94
  95 #define PAI_V1_FLAG_OFFSET                      1
  96 #define PAI_V1_NUM_ENTRIES_OFFSET               2
  97 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET       4
  98 #define PAI_V1_ENTRIES_BASE                     6
  99 #define PAI_V1_ACL_FLAG_PROTECTED               0x1
 100 #define PAI_V1_ENTRY_LENGTH                     5
 101
 102 #define PAI_V1_VERSION                          1
 103
 104 #define PAI_V2_TYPE_OFFSET                      1
 105 #define PAI_V2_NUM_ENTRIES_OFFSET               3
 106 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET       5
 107 #define PAI_V2_ENTRIES_BASE                     7
 108 #define PAI_V2_ENTRY_LENGTH                     6
 109
 110 #define PAI_V2_VERSION                          2
 111
 112 /*
 113  * In memory format of user.SAMBA_PAI attribute.
 114  */
 115
 116 struct pai_entry {
 117         struct pai_entry *next, *prev;
 118         uint8_t ace_flags;
 119         enum ace_owner owner_type;
 120         struct unixid unix_ug;
 121 };
 122
 123 struct pai_val {
 124         uint16_t sd_type;
 125         unsigned int num_entries;
 126         struct pai_entry *entry_list;
 127         unsigned int num_def_entries;
 128         struct pai_entry *def_entry_list;
 129 };
 130
 131 /************************************************************************
 132  Return a uint32 of the pai_entry principal.
 133 ************************************************************************/
 134
 135 static uint32_t get_pai_entry_val(struct pai_entry *paie)
 136 {
 137         switch (paie->owner_type) {
 138                 case UID_ACE:
 139                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.id ));
 140                         return (uint32_t)paie->unix_ug.id;
 141                 case GID_ACE:
 142                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.id ));
 143                         return (uint32_t)paie->unix_ug.id;
 144                 case WORLD_ACE:
 145                 default:
 146                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 147                         return (uint32_t)-1;
 148         }
 149 }
 150
 151 /************************************************************************
 152  Return a uint32 of the entry principal.
 153 ************************************************************************/
 154
 155 static uint32_t get_entry_val(canon_ace *ace_entry)
 156 {
 157         switch (ace_entry->owner_type) {
 158                 case UID_ACE:
 159                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.id ));
 160                         return (uint32_t)ace_entry->unix_ug.id;
 161                 case GID_ACE:
 162                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.id ));
 163                         return (uint32_t)ace_entry->unix_ug.id;
 164                 case WORLD_ACE:
 165                 default:
 166                         DEBUG(10,("get_entry_val: world ace\n"));
 167                         return (uint32_t)-1;
 168         }
 169 }
 170
 171 /************************************************************************
 172  Create the on-disk format (always v2 now). Caller must free.
 173 ************************************************************************/
 174
 175 static char *create_pai_buf_v2(canon_ace *file_ace_list,
 176                                 canon_ace *dir_ace_list,
 177                                 uint16_t sd_type,
 178                                 size_t *store_size)
 179 {
 180         char *pai_buf = NULL;
 181         canon_ace *ace_list = NULL;
 182         char *entry_offset = NULL;
 183         unsigned int num_entries = 0;
 184         unsigned int num_def_entries = 0;
 185         unsigned int i;
 186
 187         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 188                 num_entries++;
 189         }
 190
 191         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 192                 num_def_entries++;
 193         }
 194
 195         DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 196
 197         *store_size = PAI_V2_ENTRIES_BASE +
 198                 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
 199
 200         pai_buf = talloc_array(talloc_tos(), char, *store_size);
 201         if (!pai_buf) {
 202                 return NULL;
 203         }
 204
 205         /* Set up the header. */
 206         memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
 207         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
 208         SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
 209         SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
 210         SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 211
 212         DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
 213                         (unsigned int)sd_type ));
 214
 215         entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
 216
 217         i = 0;
 218         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 219                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 220                 uint32_t entry_val = get_entry_val(ace_list);
 221
 222                 SCVAL(entry_offset,0,ace_list->ace_flags);
 223                 SCVAL(entry_offset,1,type_val);
 224                 SIVAL(entry_offset,2,entry_val);
 225                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 226                         i,
 227                         (unsigned int)ace_list->ace_flags,
 228                         (unsigned int)type_val,
 229                         (unsigned int)entry_val ));
 230                 i++;
 231                 entry_offset += PAI_V2_ENTRY_LENGTH;
 232         }
 233
 234         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 235                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 236                 uint32_t entry_val = get_entry_val(ace_list);
 237
 238                 SCVAL(entry_offset,0,ace_list->ace_flags);
 239                 SCVAL(entry_offset,1,type_val);
 240                 SIVAL(entry_offset,2,entry_val);
 241                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 242                         i,
 243                         (unsigned int)ace_list->ace_flags,
 244                         (unsigned int)type_val,
 245                         (unsigned int)entry_val ));
 246                 i++;
 247                 entry_offset += PAI_V2_ENTRY_LENGTH;
 248         }
 249
 250         return pai_buf;
 251 }
 252
 253 /************************************************************************
 254  Store the user.SAMBA_PAI attribute on disk.
 255 ************************************************************************/
 256
 257 static void store_inheritance_attributes(files_struct *fsp,
 258                                         canon_ace *file_ace_list,
 259                                         canon_ace *dir_ace_list,
 260                                         uint16_t sd_type)
 261 {
 262         int ret;
 263         size_t store_size;
 264         char *pai_buf;
 265
 266         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 267                 return;
 268         }
 269
 270         pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
 271                                 sd_type, &store_size);
 272
 273         if (fsp->fh->fd != -1) {
 274                 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 275                                 pai_buf, store_size, 0);
 276         } else {
 277                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
 278                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 279                                        pai_buf, store_size, 0);
 280         }
 281
 282         TALLOC_FREE(pai_buf);
 283
 284         DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
 285                 (unsigned int)sd_type,
 286                 fsp_str_dbg(fsp)));
 287
 288         if (ret == -1 && !no_acl_syscall_error(errno)) {
 289                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 290         }
 291 }
 292
 293 /************************************************************************
 294  Delete the in memory inheritance info.
 295 ************************************************************************/
 296
 297 static void free_inherited_info(struct pai_val *pal)
 298 {
 299         if (pal) {
 300                 struct pai_entry *paie, *paie_next;
 301                 for (paie = pal->entry_list; paie; paie = paie_next) {
 302                         paie_next = paie->next;
 303                         TALLOC_FREE(paie);
 304                 }
 305                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 306                         paie_next = paie->next;
 307                         TALLOC_FREE(paie);
 308                 }
 309                 TALLOC_FREE(pal);
 310         }
 311 }
 312
 313 /************************************************************************
 314  Get any stored ACE flags.
 315 ************************************************************************/
 316
 317 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
 318 {
 319         struct pai_entry *paie;
 320
 321         if (!pal) {
 322                 return 0;
 323         }
 324
 325         /* If the entry exists it is inherited. */
 326         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 327                 if (ace_entry->owner_type == paie->owner_type &&
 328                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 329                         return paie->ace_flags;
 330         }
 331         return 0;
 332 }
 333
 334 /************************************************************************
 335  Ensure an attribute just read is valid - v1.
 336 ************************************************************************/
 337
 338 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
 339 {
 340         uint16 num_entries;
 341         uint16 num_def_entries;
 342
 343         if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
 344                 /* Corrupted - too small. */
 345                 return false;
 346         }
 347
 348         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
 349                 return false;
 350         }
 351
 352         num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
 353         num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 354
 355         /* Check the entry lists match. */
 356         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 357
 358         if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
 359                         PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
 360                 return false;
 361         }
 362
 363         return true;
 364 }
 365
 366 /************************************************************************
 367  Ensure an attribute just read is valid - v2.
 368 ************************************************************************/
 369
 370 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
 371 {
 372         uint16 num_entries;
 373         uint16 num_def_entries;
 374
 375         if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
 376                 /* Corrupted - too small. */
 377                 return false;
 378         }
 379
 380         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
 381                 return false;
 382         }
 383
 384         num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
 385         num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 386
 387         /* Check the entry lists match. */
 388         /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
 389
 390         if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
 391                         PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
 392                 return false;
 393         }
 394
 395         return true;
 396 }
 397
 398 /************************************************************************
 399  Decode the owner.
 400 ************************************************************************/
 401
 402 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
 403 {
 404         paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 405         switch( paie->owner_type) {
 406                 case UID_ACE:
 407                         paie->unix_ug.type = ID_TYPE_UID;
 408                         paie->unix_ug.id = (uid_t)IVAL(entry_offset,1);
 409                         DEBUG(10,("get_pai_owner_type: uid = %u\n",
 410                                 (unsigned int)paie->unix_ug.id ));
 411                         break;
 412                 case GID_ACE:
 413                         paie->unix_ug.type = ID_TYPE_GID;
 414                         paie->unix_ug.id = (gid_t)IVAL(entry_offset,1);
 415                         DEBUG(10,("get_pai_owner_type: gid = %u\n",
 416                                 (unsigned int)paie->unix_ug.id ));
 417                         break;
 418                 case WORLD_ACE:
 419                         paie->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
 420                         paie->unix_ug.id = -1;
 421                         DEBUG(10,("get_pai_owner_type: world ace\n"));
 422                         break;
 423                 default:
 424                         DEBUG(10,("get_pai_owner_type: unknown type %u\n",
 425                                 (unsigned int)paie->owner_type ));
 426                         return false;
 427         }
 428         return true;
 429 }
 430
 431 /************************************************************************
 432  Process v2 entries.
 433 ************************************************************************/
 434
 435 static const char *create_pai_v1_entries(struct pai_val *paiv,
 436                                 const char *entry_offset,
 437                                 bool def_entry)
 438 {
 439         int i;
 440
 441         for (i = 0; i < paiv->num_entries; i++) {
 442                 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
 443                 if (!paie) {
 444                         return NULL;
 445                 }
 446
 447                 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
 448                 if (!get_pai_owner_type(paie, entry_offset)) {
 449                         TALLOC_FREE(paie);
 450                         return NULL;
 451                 }
 452
 453                 if (!def_entry) {
 454                         DLIST_ADD(paiv->entry_list, paie);
 455                 } else {
 456                         DLIST_ADD(paiv->def_entry_list, paie);
 457                 }
 458                 entry_offset += PAI_V1_ENTRY_LENGTH;
 459         }
 460         return entry_offset;
 461 }
 462
 463 /************************************************************************
 464  Convert to in-memory format from version 1.
 465 ************************************************************************/
 466
 467 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
 468 {
 469         const char *entry_offset;
 470         struct pai_val *paiv = NULL;
 471
 472         if (!check_pai_ok_v1(buf, size)) {
 473                 return NULL;
 474         }
 475
 476         paiv = talloc(talloc_tos(), struct pai_val);
 477         if (!paiv) {
 478                 return NULL;
 479         }
 480
 481         memset(paiv, '\0', sizeof(struct pai_val));
 482
 483         paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
 484                         SEC_DESC_DACL_PROTECTED : 0;
 485
 486         paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
 487         paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 488
 489         entry_offset = buf + PAI_V1_ENTRIES_BASE;
 490
 491         DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
 492                         paiv->num_entries, paiv->num_def_entries ));
 493
 494         entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
 495         if (entry_offset == NULL) {
 496                 free_inherited_info(paiv);
 497                 return NULL;
 498         }
 499         entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
 500         if (entry_offset == NULL) {
 501                 free_inherited_info(paiv);
 502                 return NULL;
 503         }
 504
 505         return paiv;
 506 }
 507
 508 /************************************************************************
 509  Process v2 entries.
 510 ************************************************************************/
 511
 512 static const char *create_pai_v2_entries(struct pai_val *paiv,
 513                                 unsigned int num_entries,
 514                                 const char *entry_offset,
 515                                 bool def_entry)
 516 {
 517         unsigned int i;
 518
 519         for (i = 0; i < num_entries; i++) {
 520                 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
 521                 if (!paie) {
 522                         return NULL;
 523                 }
 524
 525                 paie->ace_flags = CVAL(entry_offset,0);
 526
 527                 if (!get_pai_owner_type(paie, entry_offset+1)) {
 528                         TALLOC_FREE(paie);
 529                         return NULL;
 530                 }
 531                 if (!def_entry) {
 532                         DLIST_ADD(paiv->entry_list, paie);
 533                 } else {
 534                         DLIST_ADD(paiv->def_entry_list, paie);
 535                 }
 536                 entry_offset += PAI_V2_ENTRY_LENGTH;
 537         }
 538         return entry_offset;
 539 }
 540
 541 /************************************************************************
 542  Convert to in-memory format from version 2.
 543 ************************************************************************/
 544
 545 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
 546 {
 547         const char *entry_offset;
 548         struct pai_val *paiv = NULL;
 549
 550         if (!check_pai_ok_v2(buf, size)) {
 551                 return NULL;
 552         }
 553
 554         paiv = talloc(talloc_tos(), struct pai_val);
 555         if (!paiv) {
 556                 return NULL;
 557         }
 558
 559         memset(paiv, '\0', sizeof(struct pai_val));
 560
 561         paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
 562
 563         paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
 564         paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 565
 566         entry_offset = buf + PAI_V2_ENTRIES_BASE;
 567
 568         DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
 569                         (unsigned int)paiv->sd_type,
 570                         paiv->num_entries, paiv->num_def_entries ));
 571
 572         entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
 573                                 entry_offset, false);
 574         if (entry_offset == NULL) {
 575                 free_inherited_info(paiv);
 576                 return NULL;
 577         }
 578         entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
 579                                 entry_offset, true);
 580         if (entry_offset == NULL) {
 581                 free_inherited_info(paiv);
 582                 return NULL;
 583         }
 584
 585         return paiv;
 586 }
 587
 588 /************************************************************************
 589  Convert to in-memory format - from either version 1 or 2.
 590 ************************************************************************/
 591
 592 static struct pai_val *create_pai_val(const char *buf, size_t size)
 593 {
 594         if (size < 1) {
 595                 return NULL;
 596         }
 597         if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
 598                 return create_pai_val_v1(buf, size);
 599         } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
 600                 return create_pai_val_v2(buf, size);
 601         } else {
 602                 return NULL;
 603         }
 604 }
 605
 606 /************************************************************************
 607  Load the user.SAMBA_PAI attribute.
 608 ************************************************************************/
 609
 610 static struct pai_val *fload_inherited_info(files_struct *fsp)
 611 {
 612         char *pai_buf;
 613         size_t pai_buf_size = 1024;
 614         struct pai_val *paiv = NULL;
 615         ssize_t ret;
 616
 617         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 618                 return NULL;
 619         }
 620
 621         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
 622                 return NULL;
 623         }
 624
 625         do {
 626                 if (fsp->fh->fd != -1) {
 627                         ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 628                                         pai_buf, pai_buf_size);
 629                 } else {
 630                         ret = SMB_VFS_GETXATTR(fsp->conn,
 631                                                fsp->fsp_name->base_name,
 632                                                SAMBA_POSIX_INHERITANCE_EA_NAME,
 633                                                pai_buf, pai_buf_size);
 634                 }
 635
 636                 if (ret == -1) {
 637                         if (errno != ERANGE) {
 638                                 break;
 639                         }
 640                         /* Buffer too small - enlarge it. */
 641                         pai_buf_size *= 2;
 642                         TALLOC_FREE(pai_buf);
 643                         if (pai_buf_size > 1024*1024) {
 644                                 return NULL; /* Limit malloc to 1mb. */
 645                         }
 646                         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
 647                                 return NULL;
 648                 }
 649         } while (ret == -1);
 650
 651         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
 652                   (unsigned long)ret, fsp_str_dbg(fsp)));
 653
 654         if (ret == -1) {
 655                 /* No attribute or not supported. */
 656 #if defined(ENOATTR)
 657                 if (errno != ENOATTR)
 658                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 659 #else
 660                 if (errno != ENOSYS)
 661                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 662 #endif
 663                 TALLOC_FREE(pai_buf);
 664                 return NULL;
 665         }
 666
 667         paiv = create_pai_val(pai_buf, ret);
 668
 669         if (paiv) {
 670                 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
 671                           (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
 672         }
 673
 674         TALLOC_FREE(pai_buf);
 675         return paiv;
 676 }
 677
 678 /************************************************************************
 679  Load the user.SAMBA_PAI attribute.
 680 ************************************************************************/
 681
 682 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
 683                                            const char *fname)
 684 {
 685         char *pai_buf;
 686         size_t pai_buf_size = 1024;
 687         struct pai_val *paiv = NULL;
 688         ssize_t ret;
 689
 690         if (!lp_map_acl_inherit(SNUM(conn))) {
 691                 return NULL;
 692         }
 693
 694         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
 695                 return NULL;
 696         }
 697
 698         do {
 699                 ret = SMB_VFS_GETXATTR(conn, fname,
 700                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 701                                        pai_buf, pai_buf_size);
 702
 703                 if (ret == -1) {
 704                         if (errno != ERANGE) {
 705                                 break;
 706                         }
 707                         /* Buffer too small - enlarge it. */
 708                         pai_buf_size *= 2;
 709                         TALLOC_FREE(pai_buf);
 710                         if (pai_buf_size > 1024*1024) {
 711                                 return NULL; /* Limit malloc to 1mb. */
 712                         }
 713                         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
 714                                 return NULL;
 715                 }
 716         } while (ret == -1);
 717
 718         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
 719
 720         if (ret == -1) {
 721                 /* No attribute or not supported. */
 722 #if defined(ENOATTR)
 723                 if (errno != ENOATTR)
 724                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 725 #else
 726                 if (errno != ENOSYS)
 727                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 728 #endif
 729                 TALLOC_FREE(pai_buf);
 730                 return NULL;
 731         }
 732
 733         paiv = create_pai_val(pai_buf, ret);
 734
 735         if (paiv) {
 736                 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
 737                         (unsigned int)paiv->sd_type,
 738                         fname));
 739         }
 740
 741         TALLOC_FREE(pai_buf);
 742         return paiv;
 743 }
 744
 745 /****************************************************************************
 746  Functions to manipulate the internal ACE format.
 747 ****************************************************************************/
 748
 749 /****************************************************************************
 750  Count a linked list of canonical ACE entries.
 751 ****************************************************************************/
 752
 753 static size_t count_canon_ace_list( canon_ace *l_head )
 754 {
 755         size_t count = 0;
 756         canon_ace *ace;
 757
 758         for (ace = l_head; ace; ace = ace->next)
 759                 count++;
 760
 761         return count;
 762 }
 763
 764 /****************************************************************************
 765  Free a linked list of canonical ACE entries.
 766 ****************************************************************************/
 767
 768 static void free_canon_ace_list( canon_ace *l_head )
 769 {
 770         canon_ace *list, *next;
 771
 772         for (list = l_head; list; list = next) {
 773                 next = list->next;
 774                 DLIST_REMOVE(l_head, list);
 775                 TALLOC_FREE(list);
 776         }
 777 }
 778
 779 /****************************************************************************
 780  Function to duplicate a canon_ace entry.
 781 ****************************************************************************/
 782
 783 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 784 {
 785         canon_ace *dst_ace = talloc(talloc_tos(), canon_ace);
 786
 787         if (dst_ace == NULL)
 788                 return NULL;
 789
 790         *dst_ace = *src_ace;
 791         dst_ace->prev = dst_ace->next = NULL;
 792         return dst_ace;
 793 }
 794
 795 /****************************************************************************
 796  Print out a canon ace.
 797 ****************************************************************************/
 798
 799 static void print_canon_ace(canon_ace *pace, int num)
 800 {
 801         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 802         dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
 803         if (pace->owner_type == UID_ACE) {
 804                 const char *u_name = uidtoname(pace->unix_ug.id);
 805                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.id, u_name );
 806         } else if (pace->owner_type == GID_ACE) {
 807                 char *g_name = gidtoname(pace->unix_ug.id);
 808                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.id, g_name );
 809         } else
 810                 dbgtext( "other ");
 811         switch (pace->type) {
 812                 case SMB_ACL_USER:
 813                         dbgtext( "SMB_ACL_USER ");
 814                         break;
 815                 case SMB_ACL_USER_OBJ:
 816                         dbgtext( "SMB_ACL_USER_OBJ ");
 817                         break;
 818                 case SMB_ACL_GROUP:
 819                         dbgtext( "SMB_ACL_GROUP ");
 820                         break;
 821                 case SMB_ACL_GROUP_OBJ:
 822                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 823                         break;
 824                 case SMB_ACL_OTHER:
 825                         dbgtext( "SMB_ACL_OTHER ");
 826                         break;
 827                 default:
 828                         dbgtext( "MASK " );
 829                         break;
 830         }
 831
 832         dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
 833         dbgtext( "perms ");
 834         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 835         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 836         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 837 }
 838
 839 /****************************************************************************
 840  Print out a canon ace list.
 841 ****************************************************************************/
 842
 843 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 844 {
 845         int count = 0;
 846
 847         if( DEBUGLVL( 10 )) {
 848                 dbgtext( "print_canon_ace_list: %s\n", name );
 849                 for (;ace_list; ace_list = ace_list->next, count++)
 850                         print_canon_ace(ace_list, count );
 851         }
 852 }
 853
 854 /****************************************************************************
 855  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 856 ****************************************************************************/
 857
 858 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
 859 {
 860         mode_t ret = 0;
 861
 862         ret |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRUSR : 0);
 863         ret |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 864         ret |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 865
 866         return ret;
 867 }
 868
 869 /****************************************************************************
 870  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 871 ****************************************************************************/
 872
 873 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 874 {
 875         mode_t ret = 0;
 876
 877         if (mode & r_mask)
 878                 ret |= S_IRUSR;
 879         if (mode & w_mask)
 880                 ret |= S_IWUSR;
 881         if (mode & x_mask)
 882                 ret |= S_IXUSR;
 883
 884         return ret;
 885 }
 886
 887 /****************************************************************************
 888  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 889  an SMB_ACL_PERMSET_T.
 890 ****************************************************************************/
 891
 892 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 893 {
 894         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1)
 895                 return -1;
 896         if (mode & S_IRUSR) {
 897                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
 898                         return -1;
 899         }
 900         if (mode & S_IWUSR) {
 901                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
 902                         return -1;
 903         }
 904         if (mode & S_IXUSR) {
 905                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
 906                         return -1;
 907         }
 908         return 0;
 909 }
 910
 911 /****************************************************************************
 912  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 913 ****************************************************************************/
 914
 915 void create_file_sids(const SMB_STRUCT_STAT *psbuf, struct dom_sid *powner_sid, struct dom_sid *pgroup_sid)
 916 {
 917         uid_to_sid( powner_sid, psbuf->st_ex_uid );
 918         gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
 919 }
 920
 921 /****************************************************************************
 922  Merge aces with a common UID or GID - if both are allow or deny, OR the permissions together and
 923  delete the second one. If the first is deny, mask the permissions off and delete the allow
 924  if the permissions become zero, delete the deny if the permissions are non zero.
 925 ****************************************************************************/
 926
 927 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
 928 {
 929         canon_ace *l_head = *pp_list_head;
 930         canon_ace *curr_ace_outer;
 931         canon_ace *curr_ace_outer_next;
 932
 933         /*
 934          * First, merge allow entries with identical SIDs, and deny entries
 935          * with identical SIDs.
 936          */
 937
 938         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 939                 canon_ace *curr_ace;
 940                 canon_ace *curr_ace_next;
 941
 942                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 943
 944                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 945                         bool can_merge = false;
 946
 947                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 948
 949                         /* For file ACLs we can merge if the SIDs and ALLOW/DENY
 950                          * types are the same. For directory acls we must also
 951                          * ensure the POSIX ACL types are the same.
 952                          *
 953                          * For the IDMAP_BOTH case, we must not merge
 954                          * the UID and GID ACE values for same SID
 955                          */
 956
 957                         if (!dir_acl) {
 958                                 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
 959                                              curr_ace->owner_type == curr_ace_outer->owner_type &&
 960                                              (curr_ace->attr == curr_ace_outer->attr));
 961                         } else {
 962                                 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
 963                                              curr_ace->owner_type == curr_ace_outer->owner_type &&
 964                                              (curr_ace->type == curr_ace_outer->type) &&
 965                                              (curr_ace->attr == curr_ace_outer->attr));
 966                         }
 967
 968                         if (can_merge) {
 969                                 if( DEBUGLVL( 10 )) {
 970                                         dbgtext("merge_aces: Merging ACE's\n");
 971                                         print_canon_ace( curr_ace_outer, 0);
 972                                         print_canon_ace( curr_ace, 0);
 973                                 }
 974
 975                                 /* Merge two allow or two deny ACE's. */
 976
 977                                 /* Theoretically we shouldn't merge a dir ACE if
 978                                  * one ACE has the CI flag set, and the other
 979                                  * ACE has the OI flag set, but this is rare
 980                                  * enough we can ignore it. */
 981
 982                                 curr_ace_outer->perms |= curr_ace->perms;
 983                                 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
 984                                 DLIST_REMOVE(l_head, curr_ace);
 985                                 TALLOC_FREE(curr_ace);
 986                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 987                         }
 988                 }
 989         }
 990
 991         /*
 992          * Now go through and mask off allow permissions with deny permissions.
 993          * We can delete either the allow or deny here as we know that each SID
 994          * appears only once in the list.
 995          */
 996
 997         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 998                 canon_ace *curr_ace;
 999                 canon_ace *curr_ace_next;
1000
1001                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
1002
1003                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
1004
1005                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1006
1007                         /*
1008                          * Subtract ACE's with different entries. Due to the ordering constraints
1009                          * we've put on the ACL, we know the deny must be the first one.
1010                          */
1011
1012                         if (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
1013                             (curr_ace->owner_type == curr_ace_outer->owner_type) &&
1014                             (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1015
1016                                 if( DEBUGLVL( 10 )) {
1017                                         dbgtext("merge_aces: Masking ACE's\n");
1018                                         print_canon_ace( curr_ace_outer, 0);
1019                                         print_canon_ace( curr_ace, 0);
1020                                 }
1021
1022                                 curr_ace->perms &= ~curr_ace_outer->perms;
1023
1024                                 if (curr_ace->perms == 0) {
1025
1026                                         /*
1027                                          * The deny overrides the allow. Remove the allow.
1028                                          */
1029
1030                                         DLIST_REMOVE(l_head, curr_ace);
1031                                         TALLOC_FREE(curr_ace);
1032                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1033
1034                                 } else {
1035
1036                                         /*
1037                                          * Even after removing permissions, there
1038                                          * are still allow permissions - delete the deny.
1039                                          * It is safe to delete the deny here,
1040                                          * as we are guarenteed by the deny first
1041                                          * ordering that all the deny entries for
1042                                          * this SID have already been merged into one
1043                                          * before we can get to an allow ace.
1044                                          */
1045
1046                                         DLIST_REMOVE(l_head, curr_ace_outer);
1047                                         TALLOC_FREE(curr_ace_outer);
1048                                         break;
1049                                 }
1050                         }
1051
1052                 } /* end for curr_ace */
1053         } /* end for curr_ace_outer */
1054
1055         /* We may have modified the list. */
1056
1057         *pp_list_head = l_head;
1058 }
1059
1060 /****************************************************************************
1061  Check if we need to return NT4.x compatible ACL entries.
1062 ****************************************************************************/
1063
1064 bool nt4_compatible_acls(void)
1065 {
1066         int compat = lp_acl_compatibility();
1067
1068         if (compat == ACL_COMPAT_AUTO) {
1069                 enum remote_arch_types ra_type = get_remote_arch();
1070
1071                 /* Automatically adapt to client */
1072                 return (ra_type <= RA_WINNT);
1073         } else
1074                 return (compat == ACL_COMPAT_WINNT);
1075 }
1076
1077
1078 /****************************************************************************
1079  Map canon_ace perms to permission bits NT.
1080  The attr element is not used here - we only process deny entries on set,
1081  not get. Deny entries are implicit on get with ace->perms = 0.
1082 ****************************************************************************/
1083
1084 uint32_t map_canon_ace_perms(int snum,
1085                                 enum security_ace_type *pacl_type,
1086                                 mode_t perms,
1087                                 bool directory_ace)
1088 {
1089         uint32_t nt_mask = 0;
1090
1091         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1092
1093         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1094                 if (directory_ace) {
1095                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1096                 } else {
1097                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1098                 }
1099         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1100                 /*
1101                  * Windows NT refuses to display ACEs with no permissions in them (but
1102                  * they are perfectly legal with Windows 2000). If the ACE has empty
1103                  * permissions we cannot use 0, so we use the otherwise unused
1104                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1105                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1106                  * to be changed in the future.
1107                  */
1108
1109                 if (nt4_compatible_acls())
1110                         nt_mask = UNIX_ACCESS_NONE;
1111                 else
1112                         nt_mask = 0;
1113         } else {
1114                 if (directory_ace) {
1115                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1116                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1117                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1118                 } else {
1119                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1120                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1121                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1122                 }
1123         }
1124
1125         if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1126                 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1127         }
1128
1129         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1130                         (unsigned int)perms, (unsigned int)nt_mask ));
1131
1132         return nt_mask;
1133 }
1134
1135 /****************************************************************************
1136  Map NT perms to a UNIX mode_t.
1137 ****************************************************************************/
1138
1139 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1140 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1141 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1142
1143 static mode_t map_nt_perms( uint32 *mask, int type)
1144 {
1145         mode_t mode = 0;
1146
1147         switch(type) {
1148         case S_IRUSR:
1149                 if((*mask) & GENERIC_ALL_ACCESS)
1150                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1151                 else {
1152                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1153                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1154                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1155                 }
1156                 break;
1157         case S_IRGRP:
1158                 if((*mask) & GENERIC_ALL_ACCESS)
1159                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1160                 else {
1161                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1162                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1163                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1164                 }
1165                 break;
1166         case S_IROTH:
1167                 if((*mask) & GENERIC_ALL_ACCESS)
1168                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1169                 else {
1170                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1171                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1172                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1173                 }
1174                 break;
1175         }
1176
1177         return mode;
1178 }
1179
1180 /****************************************************************************
1181  Unpack a struct security_descriptor into a UNIX owner and group.
1182 ****************************************************************************/
1183
1184 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1185                         uid_t *puser, gid_t *pgrp,
1186                         uint32 security_info_sent, const struct
1187                         security_descriptor *psd)
1188 {
1189         struct dom_sid owner_sid;
1190         struct dom_sid grp_sid;
1191
1192         *puser = (uid_t)-1;
1193         *pgrp = (gid_t)-1;
1194
1195         if(security_info_sent == 0) {
1196                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1197                 return NT_STATUS_OK;
1198         }
1199
1200         /*
1201          * Validate the owner and group SID's.
1202          */
1203
1204         memset(&owner_sid, '\0', sizeof(owner_sid));
1205         memset(&grp_sid, '\0', sizeof(grp_sid));
1206
1207         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1208
1209         /*
1210          * Don't immediately fail if the owner sid cannot be validated.
1211          * This may be a group chown only set.
1212          */
1213
1214         if (security_info_sent & SECINFO_OWNER) {
1215                 sid_copy(&owner_sid, psd->owner_sid);
1216                 if (!sid_to_uid(&owner_sid, puser)) {
1217                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1218                                 /* this allows take ownership to work
1219                                  * reasonably */
1220                                 *puser = get_current_uid(conn);
1221                         } else {
1222                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1223                                          " owner sid for %s\n",
1224                                          sid_string_dbg(&owner_sid)));
1225                                 return NT_STATUS_INVALID_OWNER;
1226                         }
1227                 }
1228                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1229                          (unsigned int)*puser ));
1230         }
1231
1232         /*
1233          * Don't immediately fail if the group sid cannot be validated.
1234          * This may be an owner chown only set.
1235          */
1236
1237         if (security_info_sent & SECINFO_GROUP) {
1238                 sid_copy(&grp_sid, psd->group_sid);
1239                 if (!sid_to_gid( &grp_sid, pgrp)) {
1240                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1241                                 /* this allows take group ownership to work
1242                                  * reasonably */
1243                                 *pgrp = get_current_gid(conn);
1244                         } else {
1245                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1246                                          " group sid.\n"));
1247                                 return NT_STATUS_INVALID_OWNER;
1248                         }
1249                 }
1250                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1251                          (unsigned int)*pgrp));
1252         }
1253
1254         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1255
1256         return NT_STATUS_OK;
1257 }
1258
1259 /****************************************************************************
1260  Ensure the enforced permissions for this share apply.
1261 ****************************************************************************/
1262
1263 static void apply_default_perms(const struct share_params *params,
1264                                 const bool is_directory, canon_ace *pace,
1265                                 mode_t type)
1266 {
1267         mode_t and_bits = (mode_t)0;
1268         mode_t or_bits = (mode_t)0;
1269
1270         /* Get the initial bits to apply. */
1271
1272         if (is_directory) {
1273                 and_bits = lp_dir_security_mask(params->service);
1274                 or_bits = lp_force_dir_security_mode(params->service);
1275         } else {
1276                 and_bits = lp_security_mask(params->service);
1277                 or_bits = lp_force_security_mode(params->service);
1278         }
1279
1280         /* Now bounce them into the S_USR space. */
1281         switch(type) {
1282         case S_IRUSR:
1283                 /* Ensure owner has read access. */
1284                 pace->perms |= S_IRUSR;
1285                 if (is_directory)
1286                         pace->perms |= (S_IWUSR|S_IXUSR);
1287                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1288                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1289                 break;
1290         case S_IRGRP:
1291                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1292                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1293                 break;
1294         case S_IROTH:
1295                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1296                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1297                 break;
1298         }
1299
1300         pace->perms = ((pace->perms & and_bits)|or_bits);
1301 }
1302
1303 /****************************************************************************
1304  Check if a given uid/SID is in a group gid/SID. This is probably very
1305  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1306 ****************************************************************************/
1307
1308 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1309 {
1310         /* "Everyone" always matches every uid. */
1311
1312         if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1313                 return True;
1314
1315         /*
1316          * if it's the current user, we already have the unix token
1317          * and don't need to do the complex user_in_group_sid() call
1318          */
1319         if (uid_ace->unix_ug.id == get_current_uid(conn)) {
1320                 const struct security_unix_token *curr_utok = NULL;
1321                 size_t i;
1322
1323                 if (group_ace->unix_ug.id == get_current_gid(conn)) {
1324                         return True;
1325                 }
1326
1327                 curr_utok = get_current_utok(conn);
1328                 for (i=0; i < curr_utok->ngroups; i++) {
1329                         if (group_ace->unix_ug.id == curr_utok->groups[i]) {
1330                                 return True;
1331                         }
1332                 }
1333         }
1334
1335         /*
1336          * user_in_group_sid() uses create_token_from_sid()
1337          * which creates an artificial NT token given just a username,
1338          * so this is not reliable for users from foreign domains
1339          * exported by winbindd!
1340          */
1341         return user_sid_in_group_sid(&uid_ace->trustee, &group_ace->trustee);
1342 }
1343
1344 /****************************************************************************
1345  A well formed POSIX file or default ACL has at least 3 entries, a
1346  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1347  In addition, the owner must always have at least read access.
1348  When using this call on get_acl, the pst struct is valid and contains
1349  the mode of the file. When using this call on set_acl, the pst struct has
1350  been modified to have a mode containing the default for this file or directory
1351  type.
1352 ****************************************************************************/
1353
1354 static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
1355                                      const struct share_params *params,
1356                                      const bool is_directory,
1357                                                         const struct dom_sid *pfile_owner_sid,
1358                                                         const struct dom_sid *pfile_grp_sid,
1359                                                         const SMB_STRUCT_STAT *pst,
1360                                                         bool setting_acl)
1361 {
1362         canon_ace *pace;
1363         canon_ace *pace_user = NULL;
1364         canon_ace *pace_group = NULL;
1365         canon_ace *pace_other = NULL;
1366
1367         for (pace = *pp_ace; pace; pace = pace->next) {
1368                 if (pace->type == SMB_ACL_USER_OBJ) {
1369
1370                         if (setting_acl)
1371                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1372                         pace_user = pace;
1373
1374                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1375
1376                         /*
1377                          * Ensure create mask/force create mode is respected on set.
1378                          */
1379
1380                         if (setting_acl)
1381                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1382                         pace_group = pace;
1383
1384                 } else if (pace->type == SMB_ACL_OTHER) {
1385
1386                         /*
1387                          * Ensure create mask/force create mode is respected on set.
1388                          */
1389
1390                         if (setting_acl)
1391                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1392                         pace_other = pace;
1393                 }
1394         }
1395
1396         if (!pace_user) {
1397                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1398                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1399                         return False;
1400                 }
1401
1402                 ZERO_STRUCTP(pace);
1403                 pace->type = SMB_ACL_USER_OBJ;
1404                 pace->owner_type = UID_ACE;
1405                 pace->unix_ug.type = ID_TYPE_UID;
1406                 pace->unix_ug.id = pst->st_ex_uid;
1407                 pace->trustee = *pfile_owner_sid;
1408                 pace->attr = ALLOW_ACE;
1409                 /* Start with existing permissions, principle of least
1410                    surprises for the user. */
1411                 pace->perms = pst->st_ex_mode;
1412
1413                 if (setting_acl) {
1414                         /* See if the owning user is in any of the other groups in
1415                            the ACE, or if there's a matching user entry (by uid
1416                            or in the case of ID_TYPE_BOTH by SID).
1417                            If so, OR in the permissions from that entry. */
1418
1419                         canon_ace *pace_iter;
1420
1421                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1422                                 if (pace_iter->type == SMB_ACL_USER &&
1423                                                 pace_iter->unix_ug.id == pace->unix_ug.id) {
1424                                         pace->perms |= pace_iter->perms;
1425                                 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1426                                         if (dom_sid_equal(&pace->trustee, &pace_iter->trustee)) {
1427                                                 pace->perms |= pace_iter->perms;
1428                                         } else if (uid_entry_in_group(conn, pace, pace_iter)) {
1429                                                 pace->perms |= pace_iter->perms;
1430                                         }
1431                                 }
1432                         }
1433
1434                         if (pace->perms == 0) {
1435                                 /* If we only got an "everyone" perm, just use that. */
1436                                 if (pace_other)
1437                                         pace->perms = pace_other->perms;
1438                         }
1439
1440                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1441                 } else {
1442                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1443                 }
1444
1445                 DLIST_ADD(*pp_ace, pace);
1446                 pace_user = pace;
1447         }
1448
1449         if (!pace_group) {
1450                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1451                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1452                         return False;
1453                 }
1454
1455                 ZERO_STRUCTP(pace);
1456                 pace->type = SMB_ACL_GROUP_OBJ;
1457                 pace->owner_type = GID_ACE;
1458                 pace->unix_ug.type = ID_TYPE_GID;
1459                 pace->unix_ug.id = pst->st_ex_gid;
1460                 pace->trustee = *pfile_grp_sid;
1461                 pace->attr = ALLOW_ACE;
1462                 if (setting_acl) {
1463                         /* If we only got an "everyone" perm, just use that. */
1464                         if (pace_other)
1465                                 pace->perms = pace_other->perms;
1466                         else
1467                                 pace->perms = 0;
1468                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1469                 } else {
1470                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1471                 }
1472
1473                 DLIST_ADD(*pp_ace, pace);
1474                 pace_group = pace;
1475         }
1476
1477         if (!pace_other) {
1478                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1479                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1480                         return False;
1481                 }
1482
1483                 ZERO_STRUCTP(pace);
1484                 pace->type = SMB_ACL_OTHER;
1485                 pace->owner_type = WORLD_ACE;
1486                 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1487                 pace->unix_ug.id = -1;
1488                 pace->trustee = global_sid_World;
1489                 pace->attr = ALLOW_ACE;
1490                 if (setting_acl) {
1491                         pace->perms = 0;
1492                         apply_default_perms(params, is_directory, pace, S_IROTH);
1493                 } else
1494                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1495
1496                 DLIST_ADD(*pp_ace, pace);
1497                 pace_other = pace;
1498         }
1499
1500         if (setting_acl) {
1501                 /* Ensure when setting a POSIX ACL, that the uid for a
1502                    SMB_ACL_USER_OBJ ACE (the owner ACE entry) has a duplicate
1503                    permission entry as an SMB_ACL_USER, and a gid for a
1504                    SMB_ACL_GROUP_OBJ ACE (the primary group ACE entry) also has
1505                    a duplicate permission entry as an SMB_ACL_GROUP. If not,
1506                    then if the ownership or group ownership of this file or
1507                    directory gets changed, the user or group can lose their
1508                    access. */
1509                 bool got_duplicate_user = false;
1510                 bool got_duplicate_group = false;
1511
1512                 for (pace = *pp_ace; pace; pace = pace->next) {
1513                         if (pace->type == SMB_ACL_USER &&
1514                                         pace->unix_ug.id == pace_user->unix_ug.id) {
1515                                 /* Already got one. */
1516                                 got_duplicate_user = true;
1517                         } else if (pace->type == SMB_ACL_GROUP &&
1518                                         pace->unix_ug.id == pace_user->unix_ug.id) {
1519                                 /* Already got one. */
1520                                 got_duplicate_group = true;
1521                         } else if ((pace->type == SMB_ACL_GROUP)
1522                                    && (dom_sid_equal(&pace->trustee, &pace_user->trustee))) {
1523                                 /* If the SID owning the file appears
1524                                  * in a group entry, then we have
1525                                  * enough duplication, they will still
1526                                  * have access */
1527                                 got_duplicate_user = true;
1528                         }
1529                 }
1530
1531                 /* If the SID is equal for the user and group that we need
1532                    to add the duplicate for, add only the group */
1533                 if (!got_duplicate_user && !got_duplicate_group
1534                                 && dom_sid_equal(&pace_group->trustee,
1535                                                 &pace_user->trustee)) {
1536                         /* Add a duplicate SMB_ACL_GROUP entry, this
1537                          * will cover the owning SID as well, as it
1538                          * will always be mapped to both a uid and
1539                          * gid. */
1540
1541                         if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1542                                 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1543                                 return false;
1544                         }
1545
1546                         ZERO_STRUCTP(pace);
1547                         pace->type = SMB_ACL_GROUP;;
1548                         pace->owner_type = GID_ACE;
1549                         pace->unix_ug.type = ID_TYPE_GID;
1550                         pace->unix_ug.id = pace_group->unix_ug.id;
1551                         pace->trustee = pace_group->trustee;
1552                         pace->attr = pace_group->attr;
1553                         pace->perms = pace_group->perms;
1554
1555                         DLIST_ADD(*pp_ace, pace);
1556
1557                         /* We're done here, make sure the
1558                            statements below are not executed. */
1559                         got_duplicate_user = true;
1560                         got_duplicate_group = true;
1561                 }
1562
1563                 if (!got_duplicate_user) {
1564                         /* Add a duplicate SMB_ACL_USER entry. */
1565                         if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1566                                 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1567                                 return false;
1568                         }
1569
1570                         ZERO_STRUCTP(pace);
1571                         pace->type = SMB_ACL_USER;;
1572                         pace->owner_type = UID_ACE;
1573                         pace->unix_ug.type = ID_TYPE_UID;
1574                         pace->unix_ug.id = pace_user->unix_ug.id;
1575                         pace->trustee = pace_user->trustee;
1576                         pace->attr = pace_user->attr;
1577                         pace->perms = pace_user->perms;
1578
1579                         DLIST_ADD(*pp_ace, pace);
1580
1581                         got_duplicate_user = true;
1582                 }
1583
1584                 if (!got_duplicate_group) {
1585                         /* Add a duplicate SMB_ACL_GROUP entry. */
1586                         if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1587                                 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1588                                 return false;
1589                         }
1590
1591                         ZERO_STRUCTP(pace);
1592                         pace->type = SMB_ACL_GROUP;;
1593                         pace->owner_type = GID_ACE;
1594                         pace->unix_ug.type = ID_TYPE_GID;
1595                         pace->unix_ug.id = pace_group->unix_ug.id;
1596                         pace->trustee = pace_group->trustee;
1597                         pace->attr = pace_group->attr;
1598                         pace->perms = pace_group->perms;
1599
1600                         DLIST_ADD(*pp_ace, pace);
1601
1602                         got_duplicate_group = true;
1603                 }
1604
1605         }
1606
1607         return True;
1608 }
1609
1610 /****************************************************************************
1611  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1612  If it does not have them, check if there are any entries where the trustee is the
1613  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1614  Note we must not do this to default directory ACLs.
1615 ****************************************************************************/
1616
1617 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1618 {
1619         bool got_user_obj, got_group_obj;
1620         canon_ace *current_ace;
1621         int i, entries;
1622
1623         entries = count_canon_ace_list(ace);
1624         got_user_obj = False;
1625         got_group_obj = False;
1626
1627         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1628                 if (current_ace->type == SMB_ACL_USER_OBJ)
1629                         got_user_obj = True;
1630                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1631                         got_group_obj = True;
1632         }
1633         if (got_user_obj && got_group_obj) {
1634                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1635                 return;
1636         }
1637
1638         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1639                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1640                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1641                         current_ace->type = SMB_ACL_USER_OBJ;
1642                         got_user_obj = True;
1643                 }
1644                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1645                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1646                         current_ace->type = SMB_ACL_GROUP_OBJ;
1647                         got_group_obj = True;
1648                 }
1649         }
1650         if (!got_user_obj)
1651                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1652         if (!got_group_obj)
1653                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1654 }
1655
1656 static bool add_current_ace_to_acl(files_struct *fsp, struct security_ace *psa,
1657                                    canon_ace **file_ace, canon_ace **dir_ace,
1658                                    bool *got_file_allow, bool *got_dir_allow,
1659                                    bool *all_aces_are_inherit_only,
1660                                    canon_ace *current_ace)
1661 {
1662
1663         /*
1664          * Map the given NT permissions into a UNIX mode_t containing only
1665          * S_I(R|W|X)USR bits.
1666          */
1667
1668         current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1669         current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1670
1671         /* Store the ace_flag. */
1672         current_ace->ace_flags = psa->flags;
1673
1674         /*
1675          * Now add the created ace to either the file list, the directory
1676          * list, or both. We *MUST* preserve the order here (hence we use
1677          * DLIST_ADD_END) as NT ACLs are order dependent.
1678          */
1679
1680         if (fsp->is_directory) {
1681
1682                 /*
1683                  * We can only add to the default POSIX ACE list if the ACE is
1684                  * designed to be inherited by both files and directories.
1685                  */
1686
1687                 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1688                     (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1689
1690                         canon_ace *current_dir_ace = current_ace;
1691                         DLIST_ADD_END(*dir_ace, current_ace, canon_ace *);
1692
1693                         /*
1694                          * Note if this was an allow ace. We can't process
1695                          * any further deny ace's after this.
1696                          */
1697
1698                         if (current_ace->attr == ALLOW_ACE)
1699                                 *got_dir_allow = True;
1700
1701                         if ((current_ace->attr == DENY_ACE) && *got_dir_allow) {
1702                                 DEBUG(0,("add_current_ace_to_acl: "
1703                                          "malformed ACL in "
1704                                          "inheritable ACL! Deny entry "
1705                                          "after Allow entry. Failing "
1706                                          "to set on file %s.\n",
1707                                          fsp_str_dbg(fsp)));
1708                                 return False;
1709                         }
1710
1711                         if( DEBUGLVL( 10 )) {
1712                                 dbgtext("add_current_ace_to_acl: adding dir ACL:\n");
1713                                 print_canon_ace( current_ace, 0);
1714                         }
1715
1716                         /*
1717                          * If this is not an inherit only ACE we need to add a duplicate
1718                          * to the file acl.
1719                          */
1720
1721                         if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1722                                 canon_ace *dup_ace = dup_canon_ace(current_ace);
1723
1724                                 if (!dup_ace) {
1725                                         DEBUG(0,("add_current_ace_to_acl: malloc fail !\n"));
1726                                         return False;
1727                                 }
1728
1729                                 /*
1730                                  * We must not free current_ace here as its
1731                                  * pointer is now owned by the dir_ace list.
1732                                  */
1733                                 current_ace = dup_ace;
1734                                 /* We've essentially split this ace into two,
1735                                  * and added the ace with inheritance request
1736                                  * bits to the directory ACL. Drop those bits for
1737                                  * the ACE we're adding to the file list. */
1738                                 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1739                                                             SEC_ACE_FLAG_CONTAINER_INHERIT|
1740                                                             SEC_ACE_FLAG_INHERIT_ONLY);
1741                         } else {
1742                                 /*
1743                                  * We must not free current_ace here as its
1744                                  * pointer is now owned by the dir_ace list.
1745                                  */
1746                                 current_ace = NULL;
1747                         }
1748
1749                         /*
1750                          * current_ace is now either owned by file_ace
1751                          * or is NULL. We can safely operate on current_dir_ace
1752                          * to treat mapping for default acl entries differently
1753                          * than access acl entries.
1754                          */
1755
1756                         if (current_dir_ace->owner_type == UID_ACE) {
1757                                 /*
1758                                  * We already decided above this is a uid,
1759                                  * for default acls ace's only CREATOR_OWNER
1760                                  * maps to ACL_USER_OBJ. All other uid
1761                                  * ace's are ACL_USER.
1762                                  */
1763                                 if (dom_sid_equal(&current_dir_ace->trustee,
1764                                                   &global_sid_Creator_Owner)) {
1765                                         current_dir_ace->type = SMB_ACL_USER_OBJ;
1766                                 } else {
1767                                         current_dir_ace->type = SMB_ACL_USER;
1768                                 }
1769                         }
1770
1771                         if (current_dir_ace->owner_type == GID_ACE) {
1772                                 /*
1773                                  * We already decided above this is a gid,
1774                                  * for default acls ace's only CREATOR_GROUP
1775                                  * maps to ACL_GROUP_OBJ. All other uid
1776                                  * ace's are ACL_GROUP.
1777                                  */
1778                                 if (dom_sid_equal(&current_dir_ace->trustee,
1779                                                   &global_sid_Creator_Group)) {
1780                                         current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1781                                 } else {
1782                                         current_dir_ace->type = SMB_ACL_GROUP;
1783                                 }
1784                         }
1785                 }
1786         }
1787
1788         /*
1789          * Only add to the file ACL if not inherit only.
1790          */
1791
1792         if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1793                 DLIST_ADD_END(*file_ace, current_ace, canon_ace *);
1794
1795                 /*
1796                  * Note if this was an allow ace. We can't process
1797                  * any further deny ace's after this.
1798                  */
1799
1800                 if (current_ace->attr == ALLOW_ACE)
1801                         *got_file_allow = True;
1802
1803                 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1804                         DEBUG(0,("add_current_ace_to_acl: malformed "
1805                                  "ACL in file ACL ! Deny entry after "
1806                                  "Allow entry. Failing to set on file "
1807                                  "%s.\n", fsp_str_dbg(fsp)));
1808                         return False;
1809                 }
1810
1811                 if( DEBUGLVL( 10 )) {
1812                         dbgtext("add_current_ace_to_acl: adding file ACL:\n");
1813                         print_canon_ace( current_ace, 0);
1814                 }
1815                 *all_aces_are_inherit_only = False;
1816                 /*
1817                  * We must not free current_ace here as its
1818                  * pointer is now owned by the file_ace list.
1819                  */
1820                 current_ace = NULL;
1821         }
1822
1823         /*
1824          * Free if ACE was not added.
1825          */
1826
1827         TALLOC_FREE(current_ace);
1828         return true;
1829 }
1830
1831 /****************************************************************************
1832  Unpack a struct security_descriptor into two canonical ace lists.
1833 ****************************************************************************/
1834
1835 static bool create_canon_ace_lists(files_struct *fsp,
1836                                         const SMB_STRUCT_STAT *pst,
1837                                         struct dom_sid *pfile_owner_sid,
1838                                         struct dom_sid *pfile_grp_sid,
1839                                         canon_ace **ppfile_ace,
1840                                         canon_ace **ppdir_ace,
1841                                         const struct security_acl *dacl)
1842 {
1843         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1844         canon_ace *file_ace = NULL;
1845         canon_ace *dir_ace = NULL;
1846         canon_ace *current_ace = NULL;
1847         bool got_dir_allow = False;
1848         bool got_file_allow = False;
1849         int i, j;
1850
1851         *ppfile_ace = NULL;
1852         *ppdir_ace = NULL;
1853
1854         /*
1855          * Convert the incoming ACL into a more regular form.
1856          */
1857
1858         for(i = 0; i < dacl->num_aces; i++) {
1859                 struct security_ace *psa = &dacl->aces[i];
1860
1861                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1862                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1863                         return False;
1864                 }
1865
1866                 if (nt4_compatible_acls()) {
1867                         /*
1868                          * The security mask may be UNIX_ACCESS_NONE which should map into
1869                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1870                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1871                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1872                          */
1873
1874                         /*
1875                          * Convert GENERIC bits to specific bits.
1876                          */
1877
1878                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1879
1880                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1881
1882                         if(psa->access_mask != UNIX_ACCESS_NONE)
1883                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1884                 }
1885         }
1886
1887         /*
1888          * Deal with the fact that NT 4.x re-writes the canonical format
1889          * that we return for default ACLs. If a directory ACE is identical
1890          * to a inherited directory ACE then NT changes the bits so that the
1891          * first ACE is set to OI|IO and the second ACE for this SID is set
1892          * to CI. We need to repair this. JRA.
1893          */
1894
1895         for(i = 0; i < dacl->num_aces; i++) {
1896                 struct security_ace *psa1 = &dacl->aces[i];
1897
1898                 for (j = i + 1; j < dacl->num_aces; j++) {
1899                         struct security_ace *psa2 = &dacl->aces[j];
1900
1901                         if (psa1->access_mask != psa2->access_mask)
1902                                 continue;
1903
1904                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1905                                 continue;
1906
1907                         /*
1908                          * Ok - permission bits and SIDs are equal.
1909                          * Check if flags were re-written.
1910                          */
1911
1912                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1913
1914                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1915                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1916
1917                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1918
1919                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1920                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1921
1922                         }
1923                 }
1924         }
1925
1926         for(i = 0; i < dacl->num_aces; i++) {
1927                 struct security_ace *psa = &dacl->aces[i];
1928
1929                 /*
1930                  * Create a canon_ace entry representing this NT DACL ACE.
1931                  */
1932
1933                 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1934                         free_canon_ace_list(file_ace);
1935                         free_canon_ace_list(dir_ace);
1936                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1937                         return False;
1938                 }
1939
1940                 ZERO_STRUCTP(current_ace);
1941
1942                 sid_copy(&current_ace->trustee, &psa->trustee);
1943
1944                 /*
1945                  * Try and work out if the SID is a user or group
1946                  * as we need to flag these differently for POSIX.
1947                  * Note what kind of a POSIX ACL this should map to.
1948                  */
1949
1950                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1951                         current_ace->owner_type = WORLD_ACE;
1952                         current_ace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1953                         current_ace->unix_ug.id = -1;
1954                         current_ace->type = SMB_ACL_OTHER;
1955                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1956                         current_ace->owner_type = UID_ACE;
1957                         current_ace->unix_ug.type = ID_TYPE_UID;
1958                         current_ace->unix_ug.id = pst->st_ex_uid;
1959                         current_ace->type = SMB_ACL_USER_OBJ;
1960
1961                         /*
1962                          * The Creator Owner entry only specifies inheritable permissions,
1963                          * never access permissions. WinNT doesn't always set the ACE to
1964                          * INHERIT_ONLY, though.
1965                          */
1966
1967                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1968
1969                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1970                         current_ace->owner_type = GID_ACE;
1971                         current_ace->unix_ug.type = ID_TYPE_GID;
1972                         current_ace->unix_ug.id = pst->st_ex_gid;
1973                         current_ace->type = SMB_ACL_GROUP_OBJ;
1974
1975                         /*
1976                          * The Creator Group entry only specifies inheritable permissions,
1977                          * never access permissions. WinNT doesn't always set the ACE to
1978                          * INHERIT_ONLY, though.
1979                          */
1980                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1981
1982                 } else {
1983                         struct unixid unixid;
1984
1985                         if (!sids_to_unixids(&current_ace->trustee, 1, &unixid)) {
1986                                 free_canon_ace_list(file_ace);
1987                                 free_canon_ace_list(dir_ace);
1988                                 TALLOC_FREE(current_ace);
1989                                 DEBUG(0, ("create_canon_ace_lists: sids_to_unixids "
1990                                         "failed for %s (allocation failure)\n",
1991                                         sid_string_dbg(&current_ace->trustee)));
1992                                 return false;
1993                         }
1994
1995                         if (unixid.type == ID_TYPE_BOTH) {
1996                                 /* If it's the owning user, this is a
1997                                  * user_obj, not a user.  This way, we
1998                                  * get a valid ACL for groups that own
1999                                  * files, without putting user ACL
2000                                  * entries in for groups otherwise */
2001                                 if (unixid.id == pst->st_ex_uid) {
2002                                         current_ace->owner_type = UID_ACE;
2003                                         current_ace->unix_ug.type = ID_TYPE_UID;
2004                                         current_ace->unix_ug.id = unixid.id;
2005                                         current_ace->type = SMB_ACL_USER_OBJ;
2006
2007                                         /* Add the user object to the posix ACL,
2008                                            and proceed to the group mapping
2009                                            below. This handles the talloc_free
2010                                            of current_ace if not added for some
2011                                            reason */
2012                                         if (!add_current_ace_to_acl(fsp,
2013                                                         psa,
2014                                                         &file_ace,
2015                                                         &dir_ace,
2016                                                         &got_file_allow,
2017                                                         &got_dir_allow,
2018                                                         &all_aces_are_inherit_only,
2019                                                         current_ace)) {
2020                                                 free_canon_ace_list(file_ace);
2021                                                 free_canon_ace_list(dir_ace);
2022                                                 return false;
2023                                         }
2024
2025                                         if ((current_ace = talloc(talloc_tos(),
2026                                                         canon_ace)) == NULL) {
2027                                                 free_canon_ace_list(file_ace);
2028                                                 free_canon_ace_list(dir_ace);
2029                                                 DEBUG(0,("create_canon_ace_lists: "
2030                                                         "malloc fail.\n"));
2031                                                 return False;
2032                                         }
2033
2034                                         ZERO_STRUCTP(current_ace);
2035                                 }
2036
2037                                 sid_copy(&current_ace->trustee, &psa->trustee);
2038
2039                                 current_ace->unix_ug.type = ID_TYPE_GID;
2040                                 current_ace->unix_ug.id = unixid.id;
2041                                 current_ace->owner_type = GID_ACE;
2042                                 /* If it's the primary group, this is a
2043                                    group_obj, not a group. */
2044                                 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2045                                         current_ace->type = SMB_ACL_GROUP_OBJ;
2046                                 } else {
2047                                         current_ace->type = SMB_ACL_GROUP;
2048                                 }
2049
2050                         } else if (unixid.type == ID_TYPE_UID) {
2051                                 current_ace->owner_type = UID_ACE;
2052                                 current_ace->unix_ug.type = ID_TYPE_UID;
2053                                 current_ace->unix_ug.id = unixid.id;
2054                                 /* If it's the owning user, this is a user_obj,
2055                                    not a user. */
2056                                 if (current_ace->unix_ug.id == pst->st_ex_uid) {
2057                                         current_ace->type = SMB_ACL_USER_OBJ;
2058                                 } else {
2059                                         current_ace->type = SMB_ACL_USER;
2060                                 }
2061                         } else if (unixid.type == ID_TYPE_GID) {
2062                                 current_ace->unix_ug.type = ID_TYPE_GID;
2063                                 current_ace->unix_ug.id = unixid.id;
2064                                 current_ace->owner_type = GID_ACE;
2065                                 /* If it's the primary group, this is a
2066                                    group_obj, not a group. */
2067                                 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2068                                         current_ace->type = SMB_ACL_GROUP_OBJ;
2069                                 } else {
2070                                         current_ace->type = SMB_ACL_GROUP;
2071                                 }
2072                         } else {
2073                                 /*
2074                                  * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
2075                                  */
2076
2077                                 if (non_mappable_sid(&psa->trustee)) {
2078                                         DEBUG(10, ("create_canon_ace_lists: ignoring "
2079                                                    "non-mappable SID %s\n",
2080                                                    sid_string_dbg(&psa->trustee)));
2081                                         TALLOC_FREE(current_ace);
2082                                         continue;
2083                                 }
2084
2085                                 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
2086                                         DEBUG(10, ("create_canon_ace_lists: ignoring "
2087                                                 "unknown or foreign SID %s\n",
2088                                                 sid_string_dbg(&psa->trustee)));
2089                                         TALLOC_FREE(current_ace);
2090                                         continue;
2091                                 }
2092
2093                                 free_canon_ace_list(file_ace);
2094                                 free_canon_ace_list(dir_ace);
2095                                 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
2096                                           "%s to uid or gid.\n",
2097                                           sid_string_dbg(&current_ace->trustee)));
2098                                 TALLOC_FREE(current_ace);
2099                                 return false;
2100                         }
2101                 }
2102
2103                 /* handles the talloc_free of current_ace if not added for some reason */
2104                 if (!add_current_ace_to_acl(fsp, psa, &file_ace, &dir_ace,
2105                                             &got_file_allow, &got_dir_allow,
2106                                             &all_aces_are_inherit_only, current_ace)) {
2107                         free_canon_ace_list(file_ace);
2108                         free_canon_ace_list(dir_ace);
2109                         return false;
2110                 }
2111         }
2112
2113         if (fsp->is_directory && all_aces_are_inherit_only) {
2114                 /*
2115                  * Windows 2000 is doing one of these weird 'inherit acl'
2116                  * traverses to conserve NTFS ACL resources. Just pretend
2117                  * there was no DACL sent. JRA.
2118                  */
2119
2120                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
2121                 free_canon_ace_list(file_ace);
2122                 free_canon_ace_list(dir_ace);
2123                 file_ace = NULL;
2124                 dir_ace = NULL;
2125         } else {
2126                 /*
2127                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
2128                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
2129                  * entries can be converted to *_OBJ. Don't do this for the default
2130                  * ACL, we will create them separately for this if needed inside
2131                  * ensure_canon_entry_valid().
2132                  */
2133                 if (file_ace) {
2134                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
2135                 }
2136         }
2137
2138         *ppfile_ace = file_ace;
2139         *ppdir_ace = dir_ace;
2140
2141         return True;
2142 }
2143
2144 /****************************************************************************
2145  ASCII art time again... JRA :-).
2146
2147  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2148  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2149  entries). Secondly, the merge code has ensured that all duplicate SID entries for
2150  allow or deny have been merged, so the same SID can only appear once in the deny
2151  list or once in the allow list.
2152
2153  We then process as follows :
2154
2155  ---------------------------------------------------------------------------
2156  First pass - look for a Everyone DENY entry.
2157
2158  If it is deny all (rwx) trunate the list at this point.
2159  Else, walk the list from this point and use the deny permissions of this
2160  entry as a mask on all following allow entries. Finally, delete
2161  the Everyone DENY entry (we have applied it to everything possible).
2162
2163  In addition, in this pass we remove any DENY entries that have
2164  no permissions (ie. they are a DENY nothing).
2165  ---------------------------------------------------------------------------
2166  Second pass - only deal with deny user entries.
2167
2168  DENY user1 (perms XXX)
2169
2170  new_perms = 0
2171  for all following allow group entries where user1 is in group
2172         new_perms |= group_perms;
2173
2174  user1 entry perms = new_perms & ~ XXX;
2175
2176  Convert the deny entry to an allow entry with the new perms and
2177  push to the end of the list. Note if the user was in no groups
2178  this maps to a specific allow nothing entry for this user.
2179
2180  The common case from the NT ACL choser (userX deny all) is
2181  optimised so we don't do the group lookup - we just map to
2182  an allow nothing entry.
2183
2184  What we're doing here is inferring the allow permissions the
2185  person setting the ACE on user1 wanted by looking at the allow
2186  permissions on the groups the user is currently in. This will
2187  be a snapshot, depending on group membership but is the best
2188  we can do and has the advantage of failing closed rather than
2189  open.
2190  ---------------------------------------------------------------------------
2191  Third pass - only deal with deny group entries.
2192
2193  DENY group1 (perms XXX)
2194
2195  for all following allow user entries where user is in group1
2196    user entry perms = user entry perms & ~ XXX;
2197
2198  If there is a group Everyone allow entry with permissions YYY,
2199  convert the group1 entry to an allow entry and modify its
2200  permissions to be :
2201
2202  new_perms = YYY & ~ XXX
2203
2204  and push to the end of the list.
2205
2206  If there is no group Everyone allow entry then convert the
2207  group1 entry to a allow nothing entry and push to the end of the list.
2208
2209  Note that the common case from the NT ACL choser (groupX deny all)
2210  cannot be optimised here as we need to modify user entries who are
2211  in the group to change them to a deny all also.
2212
2213  What we're doing here is modifying the allow permissions of
2214  user entries (which are more specific in POSIX ACLs) to mask
2215  out the explicit deny set on the group they are in. This will
2216  be a snapshot depending on current group membership but is the
2217  best we can do and has the advantage of failing closed rather
2218  than open.
2219  ---------------------------------------------------------------------------
2220  Fourth pass - cope with cumulative permissions.
2221
2222  for all allow user entries, if there exists an allow group entry with
2223  more permissive permissions, and the user is in that group, rewrite the
2224  allow user permissions to contain both sets of permissions.
2225
2226  Currently the code for this is #ifdef'ed out as these semantics make
2227  no sense to me. JRA.
2228  ---------------------------------------------------------------------------
2229
2230  Note we *MUST* do the deny user pass first as this will convert deny user
2231  entries into allow user entries which can then be processed by the deny
2232  group pass.
2233
2234  The above algorithm took a *lot* of thinking about - hence this
2235  explaination :-). JRA.
2236 ****************************************************************************/
2237
2238 /****************************************************************************
2239  Process a canon_ace list entries. This is very complex code. We need
2240  to go through and remove the "deny" permissions from any allow entry that matches
2241  the id of this entry. We have already refused any NT ACL that wasn't in correct
2242  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2243  we just remove it (to fail safe). We have already removed any duplicate ace
2244  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2245  allow entries.
2246 ****************************************************************************/
2247
2248 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2249 {
2250         canon_ace *ace_list = *pp_ace_list;
2251         canon_ace *curr_ace = NULL;
2252         canon_ace *curr_ace_next = NULL;
2253
2254         /* Pass 1 above - look for an Everyone, deny entry. */
2255
2256         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2257                 canon_ace *allow_ace_p;
2258
2259                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2260
2261                 if (curr_ace->attr != DENY_ACE)
2262                         continue;
2263
2264                 if (curr_ace->perms == (mode_t)0) {
2265
2266                         /* Deny nothing entry - delete. */
2267
2268                         DLIST_REMOVE(ace_list, curr_ace);
2269                         continue;
2270                 }
2271
2272                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2273                         continue;
2274
2275                 /* JRATEST - assert. */
2276                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2277
2278                 if (curr_ace->perms == ALL_ACE_PERMS) {
2279
2280                         /*
2281                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2282                          * list at this point including this entry.
2283                          */
2284
2285                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2286
2287                         free_canon_ace_list( curr_ace );
2288                         if (prev_entry)
2289                                 DLIST_REMOVE(ace_list, prev_entry);
2290                         else {
2291                                 /* We deleted the entire list. */
2292                                 ace_list = NULL;
2293                         }
2294                         break;
2295                 }
2296
2297                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2298
2299                         /*
2300                          * Only mask off allow entries.
2301                          */
2302
2303                         if (allow_ace_p->attr != ALLOW_ACE)
2304                                 continue;
2305
2306                         allow_ace_p->perms &= ~curr_ace->perms;
2307                 }
2308
2309                 /*
2310                  * Now it's been applied, remove it.
2311                  */
2312
2313                 DLIST_REMOVE(ace_list, curr_ace);
2314         }
2315
2316         /* Pass 2 above - deal with deny user entries. */
2317
2318         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2319                 mode_t new_perms = (mode_t)0;
2320                 canon_ace *allow_ace_p;
2321
2322                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2323
2324                 if (curr_ace->attr != DENY_ACE)
2325                         continue;
2326
2327                 if (curr_ace->owner_type != UID_ACE)
2328                         continue;
2329
2330                 if (curr_ace->perms == ALL_ACE_PERMS) {
2331
2332                         /*
2333                          * Optimisation - this is a deny everything to this user.
2334                          * Convert to an allow nothing and push to the end of the list.
2335                          */
2336
2337                         curr_ace->attr = ALLOW_ACE;
2338                         curr_ace->perms = (mode_t)0;
2339                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2340                         continue;
2341                 }
2342
2343                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2344
2345                         if (allow_ace_p->attr != ALLOW_ACE)
2346                                 continue;
2347
2348                         /* We process GID_ACE and WORLD_ACE entries only. */
2349
2350                         if (allow_ace_p->owner_type == UID_ACE)
2351                                 continue;
2352
2353                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2354                                 new_perms |= allow_ace_p->perms;
2355                 }
2356
2357                 /*
2358                  * Convert to a allow entry, modify the perms and push to the end
2359                  * of the list.
2360                  */
2361
2362                 curr_ace->attr = ALLOW_ACE;
2363                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2364                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2365         }
2366
2367         /* Pass 3 above - deal with deny group entries. */
2368
2369         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2370                 canon_ace *allow_ace_p;
2371                 canon_ace *allow_everyone_p = NULL;
2372
2373                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2374
2375                 if (curr_ace->attr != DENY_ACE)
2376                         continue;
2377
2378                 if (curr_ace->owner_type != GID_ACE)
2379                         continue;
2380
2381                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2382
2383                         if (allow_ace_p->attr != ALLOW_ACE)
2384                                 continue;
2385
2386                         /* Store a pointer to the Everyone allow, if it exists. */
2387                         if (allow_ace_p->owner_type == WORLD_ACE)
2388                                 allow_everyone_p = allow_ace_p;
2389
2390                         /* We process UID_ACE entries only. */
2391
2392                         if (allow_ace_p->owner_type != UID_ACE)
2393                                 continue;
2394
2395                         /* Mask off the deny group perms. */
2396
2397                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2398                                 allow_ace_p->perms &= ~curr_ace->perms;
2399                 }
2400
2401                 /*
2402                  * Convert the deny to an allow with the correct perms and
2403                  * push to the end of the list.
2404                  */
2405
2406                 curr_ace->attr = ALLOW_ACE;
2407                 if (allow_everyone_p)
2408                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2409                 else
2410                         curr_ace->perms = (mode_t)0;
2411                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2412         }
2413
2414         /* Doing this fourth pass allows Windows semantics to be layered
2415          * on top of POSIX semantics. I'm not sure if this is desirable.
2416          * For example, in W2K ACLs there is no way to say, "Group X no
2417          * access, user Y full access" if user Y is a member of group X.
2418          * This seems completely broken semantics to me.... JRA.
2419          */
2420
2421 #if 0
2422         /* Pass 4 above - deal with allow entries. */
2423
2424         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2425                 canon_ace *allow_ace_p;
2426
2427                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2428
2429                 if (curr_ace->attr != ALLOW_ACE)
2430                         continue;
2431
2432                 if (curr_ace->owner_type != UID_ACE)
2433                         continue;
2434
2435                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2436
2437                         if (allow_ace_p->attr != ALLOW_ACE)
2438                                 continue;
2439
2440                         /* We process GID_ACE entries only. */
2441
2442                         if (allow_ace_p->owner_type != GID_ACE)
2443                                 continue;
2444
2445                         /* OR in the group perms. */
2446
2447                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2448                                 curr_ace->perms |= allow_ace_p->perms;
2449                 }
2450         }
2451 #endif
2452
2453         *pp_ace_list = ace_list;
2454 }
2455
2456 /****************************************************************************
2457  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2458  succeeding.
2459 ****************************************************************************/
2460
2461 static bool unpack_canon_ace(files_struct *fsp,
2462                                 const SMB_STRUCT_STAT *pst,
2463                                 struct dom_sid *pfile_owner_sid,
2464                                 struct dom_sid *pfile_grp_sid,
2465                                 canon_ace **ppfile_ace,
2466                                 canon_ace **ppdir_ace,
2467                                 uint32 security_info_sent,
2468                                 const struct security_descriptor *psd)
2469 {
2470         canon_ace *file_ace = NULL;
2471         canon_ace *dir_ace = NULL;
2472
2473         *ppfile_ace = NULL;
2474         *ppdir_ace = NULL;
2475
2476         if(security_info_sent == 0) {
2477                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2478                 return False;
2479         }
2480
2481         /*
2482          * If no DACL then this is a chown only security descriptor.
2483          */
2484
2485         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2486                 return True;
2487
2488         /*
2489          * Now go through the DACL and create the canon_ace lists.
2490          */
2491
2492         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2493                                                                 &file_ace, &dir_ace, psd->dacl))
2494                 return False;
2495
2496         if ((file_ace == NULL) && (dir_ace == NULL)) {
2497                 /* W2K traverse DACL set - ignore. */
2498                 return True;
2499         }
2500
2501         /*
2502          * Go through the canon_ace list and merge entries
2503          * belonging to identical users of identical allow or deny type.
2504          * We can do this as all deny entries come first, followed by
2505          * all allow entries (we have mandated this before accepting this acl).
2506          */
2507
2508         print_canon_ace_list( "file ace - before merge", file_ace);
2509         merge_aces( &file_ace, false);
2510
2511         print_canon_ace_list( "dir ace - before merge", dir_ace);
2512         merge_aces( &dir_ace, true);
2513
2514         /*
2515          * NT ACLs are order dependent. Go through the acl lists and
2516          * process DENY entries by masking the allow entries.
2517          */
2518
2519         print_canon_ace_list( "file ace - before deny", file_ace);
2520         process_deny_list(fsp->conn, &file_ace);
2521
2522         print_canon_ace_list( "dir ace - before deny", dir_ace);
2523         process_deny_list(fsp->conn, &dir_ace);
2524
2525         /*
2526          * A well formed POSIX file or default ACL has at least 3 entries, a
2527          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2528          * and optionally a mask entry. Ensure this is the case.
2529          */
2530
2531         print_canon_ace_list( "file ace - before valid", file_ace);
2532
2533         if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2534                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2535                 free_canon_ace_list(file_ace);
2536                 free_canon_ace_list(dir_ace);
2537                 return False;
2538         }
2539
2540         print_canon_ace_list( "dir ace - before valid", dir_ace);
2541
2542         if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2543                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2544                 free_canon_ace_list(file_ace);
2545                 free_canon_ace_list(dir_ace);
2546                 return False;
2547         }
2548
2549         print_canon_ace_list( "file ace - return", file_ace);
2550         print_canon_ace_list( "dir ace - return", dir_ace);
2551
2552         *ppfile_ace = file_ace;
2553         *ppdir_ace = dir_ace;
2554         return True;
2555
2556 }
2557
2558 /******************************************************************************
2559  When returning permissions, try and fit NT display
2560  semantics if possible. Note the the canon_entries here must have been malloced.
2561  The list format should be - first entry = owner, followed by group and other user
2562  entries, last entry = other.
2563
2564  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2565  are not ordered, and match on the most specific entry rather than walking a list,
2566  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2567
2568  Entry 0: owner : deny all except read and write.
2569  Entry 1: owner : allow read and write.
2570  Entry 2: group : deny all except read.
2571  Entry 3: group : allow read.
2572  Entry 4: Everyone : allow read.
2573
2574  But NT cannot display this in their ACL editor !
2575 ********************************************************************************/
2576
2577 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2578 {
2579         canon_ace *l_head = *pp_list_head;
2580         canon_ace *owner_ace = NULL;
2581         canon_ace *other_ace = NULL;
2582         canon_ace *ace = NULL;
2583
2584         for (ace = l_head; ace; ace = ace->next) {
2585                 if (ace->type == SMB_ACL_USER_OBJ)
2586                         owner_ace = ace;
2587                 else if (ace->type == SMB_ACL_OTHER) {
2588                         /* Last ace - this is "other" */
2589                         other_ace = ace;
2590                 }
2591         }
2592
2593         if (!owner_ace || !other_ace) {
2594                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2595                         filename ));
2596                 return;
2597         }
2598
2599         /*
2600          * The POSIX algorithm applies to owner first, and other last,
2601          * so ensure they are arranged in this order.
2602          */
2603
2604         if (owner_ace) {
2605                 DLIST_PROMOTE(l_head, owner_ace);
2606         }
2607
2608         if (other_ace) {
2609                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2610         }
2611
2612         /* We have probably changed the head of the list. */
2613
2614         *pp_list_head = l_head;
2615 }
2616
2617 /****************************************************************************
2618  Create a linked list of canonical ACE entries.
2619 ****************************************************************************/
2620
2621 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2622                                    const char *fname, SMB_ACL_T posix_acl,
2623                                    const SMB_STRUCT_STAT *psbuf,
2624                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2625 {
2626         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2627         canon_ace *l_head = NULL;
2628         canon_ace *ace = NULL;
2629         canon_ace *next_ace = NULL;
2630         int entry_id = SMB_ACL_FIRST_ENTRY;
2631         SMB_ACL_ENTRY_T entry;
2632         size_t ace_count;
2633
2634         while ( posix_acl && (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1)) {
2635                 SMB_ACL_TAG_T tagtype;
2636                 SMB_ACL_PERMSET_T permset;
2637                 struct dom_sid sid;
2638                 struct unixid unix_ug;
2639                 enum ace_owner owner_type;
2640
2641                 entry_id = SMB_ACL_NEXT_ENTRY;
2642
2643                 /* Is this a MASK entry ? */
2644                 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
2645                         continue;
2646
2647                 if (sys_acl_get_permset(entry, &permset) == -1)
2648                         continue;
2649
2650                 /* Decide which SID to use based on the ACL type. */
2651                 switch(tagtype) {
2652                         case SMB_ACL_USER_OBJ:
2653                                 /* Get the SID from the owner. */
2654                                 sid_copy(&sid, powner);
2655                                 unix_ug.type = ID_TYPE_UID;
2656                                 unix_ug.id = psbuf->st_ex_uid;
2657                                 owner_type = UID_ACE;
2658                                 break;
2659                         case SMB_ACL_USER:
2660                                 {
2661                                         uid_t *puid = (uid_t *)sys_acl_get_qualifier(entry);
2662                                         if (puid == NULL) {
2663                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2664                                                 continue;
2665                                         }
2666                                         uid_to_sid( &sid, *puid);
2667                                         unix_ug.type = ID_TYPE_UID;
2668                                         unix_ug.id = *puid;
2669                                         owner_type = UID_ACE;
2670                                         sys_acl_free_qualifier((void *)puid,tagtype);
2671                                         break;
2672                                 }
2673                         case SMB_ACL_GROUP_OBJ:
2674                                 /* Get the SID from the owning group. */
2675                                 sid_copy(&sid, pgroup);
2676                                 unix_ug.type = ID_TYPE_GID;
2677                                 unix_ug.id = psbuf->st_ex_gid;
2678                                 owner_type = GID_ACE;
2679                                 break;
2680                         case SMB_ACL_GROUP:
2681                                 {
2682                                         gid_t *pgid = (gid_t *)sys_acl_get_qualifier(entry);
2683                                         if (pgid == NULL) {
2684                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2685                                                 continue;
2686                                         }
2687                                         gid_to_sid( &sid, *pgid);
2688                                         unix_ug.type = ID_TYPE_GID;
2689                                         unix_ug.id = *pgid;
2690                                         owner_type = GID_ACE;
2691                                         sys_acl_free_qualifier((void *)pgid,tagtype);
2692                                         break;
2693                                 }
2694                         case SMB_ACL_MASK:
2695                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2696                                 continue; /* Don't count the mask as an entry. */
2697                         case SMB_ACL_OTHER:
2698                                 /* Use the Everyone SID */
2699                                 sid = global_sid_World;
2700                                 unix_ug.type = ID_TYPE_NOT_SPECIFIED;
2701                                 unix_ug.id = -1;
2702                                 owner_type = WORLD_ACE;
2703                                 break;
2704                         default:
2705                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2706                                 continue;
2707                 }
2708
2709                 /*
2710                  * Add this entry to the list.
2711                  */
2712
2713                 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2714                         goto fail;
2715
2716                 ZERO_STRUCTP(ace);
2717                 ace->type = tagtype;
2718                 ace->perms = convert_permset_to_mode_t(conn, permset);
2719                 ace->attr = ALLOW_ACE;
2720                 ace->trustee = sid;
2721                 ace->unix_ug = unix_ug;
2722                 ace->owner_type = owner_type;
2723                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2724
2725                 DLIST_ADD(l_head, ace);
2726         }
2727
2728         /*
2729          * This next call will ensure we have at least a user/group/world set.
2730          */
2731
2732         if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2733                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2734                                       psbuf, False))
2735                 goto fail;
2736
2737         /*
2738          * Now go through the list, masking the permissions with the
2739          * acl_mask. Ensure all DENY Entries are at the start of the list.
2740          */
2741
2742         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2743
2744         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2745                 next_ace = ace->next;
2746
2747                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2748                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2749                         ace->perms &= acl_mask;
2750
2751                 if (ace->perms == 0) {
2752                         DLIST_PROMOTE(l_head, ace);
2753                 }
2754
2755                 if( DEBUGLVL( 10 ) ) {
2756                         print_canon_ace(ace, ace_count);
2757                 }
2758         }
2759
2760         arrange_posix_perms(fname,&l_head );
2761
2762         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2763
2764         return l_head;
2765
2766   fail:
2767
2768         free_canon_ace_list(l_head);
2769         return NULL;
2770 }
2771
2772 /****************************************************************************
2773  Check if the current user group list contains a given group.
2774 ****************************************************************************/
2775
2776 bool current_user_in_group(connection_struct *conn, gid_t gid)
2777 {
2778         int i;
2779         const struct security_unix_token *utok = get_current_utok(conn);
2780
2781         for (i = 0; i < utok->ngroups; i++) {
2782                 if (utok->groups[i] == gid) {
2783                         return True;
2784                 }
2785         }
2786
2787         return False;
2788 }
2789
2790 /****************************************************************************
2791  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2792 ****************************************************************************/
2793
2794 static bool acl_group_override(connection_struct *conn,
2795                                const struct smb_filename *smb_fname)
2796 {
2797         if ((errno != EPERM) && (errno != EACCES)) {
2798                 return false;
2799         }
2800
2801         /* file primary group == user primary or supplementary group */
2802         if (lp_acl_group_control(SNUM(conn)) &&
2803             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2804                 return true;
2805         }
2806
2807         /* user has writeable permission */
2808         if (lp_dos_filemode(SNUM(conn)) &&
2809             can_write_to_file(conn, smb_fname)) {
2810                 return true;
2811         }
2812
2813         return false;
2814 }
2815
2816 /****************************************************************************
2817  Attempt to apply an ACL to a file or directory.
2818 ****************************************************************************/
2819
2820 static bool set_canon_ace_list(files_struct *fsp,
2821                                 canon_ace *the_ace,
2822                                 bool default_ace,
2823                                 const SMB_STRUCT_STAT *psbuf,
2824                                 bool *pacl_set_support)
2825 {
2826         connection_struct *conn = fsp->conn;
2827         bool ret = False;
2828         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2829         canon_ace *p_ace;
2830         int i;
2831         SMB_ACL_ENTRY_T mask_entry;
2832         bool got_mask_entry = False;
2833         SMB_ACL_PERMSET_T mask_permset;
2834         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2835         bool needs_mask = False;
2836         mode_t mask_perms = 0;
2837
2838         /* Use the psbuf that was passed in. */
2839         if (psbuf != &fsp->fsp_name->st) {
2840                 fsp->fsp_name->st = *psbuf;
2841         }
2842
2843 #if defined(POSIX_ACL_NEEDS_MASK)
2844         /* HP-UX always wants to have a mask (called "class" there). */
2845         needs_mask = True;
2846 #endif
2847
2848         if (the_acl == NULL) {
2849
2850                 if (!no_acl_syscall_error(errno)) {
2851                         /*
2852                          * Only print this error message if we have some kind of ACL
2853                          * support that's not working. Otherwise we would always get this.
2854                          */
2855                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2856                                 default_ace ? "default" : "file", strerror(errno) ));
2857                 }
2858                 *pacl_set_support = False;
2859                 goto fail;
2860         }
2861
2862         if( DEBUGLVL( 10 )) {
2863                 dbgtext("set_canon_ace_list: setting ACL:\n");
2864                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2865                         print_canon_ace( p_ace, i);
2866                 }
2867         }
2868
2869         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2870                 SMB_ACL_ENTRY_T the_entry;
2871                 SMB_ACL_PERMSET_T the_permset;
2872
2873                 /*
2874                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2875                  * named group entries. But if there is an ACL_MASK entry, it applies
2876                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2877                  * so that it doesn't deny (i.e., mask off) any permissions.
2878                  */
2879
2880                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2881                         needs_mask = True;
2882                         mask_perms |= p_ace->perms;
2883                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2884                         mask_perms |= p_ace->perms;
2885                 }
2886
2887                 /*
2888                  * Get the entry for this ACE.
2889                  */
2890
2891                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2892                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2893                                 i, strerror(errno) ));
2894                         goto fail;
2895                 }
2896
2897                 if (p_ace->type == SMB_ACL_MASK) {
2898                         mask_entry = the_entry;
2899                         got_mask_entry = True;
2900                 }
2901
2902                 /*
2903                  * Ok - we now know the ACL calls should be working, don't
2904                  * allow fallback to chmod.
2905                  */
2906
2907                 *pacl_set_support = True;
2908
2909                 /*
2910                  * Initialise the entry from the canon_ace.
2911                  */
2912
2913                 /*
2914                  * First tell the entry what type of ACE this is.
2915                  */
2916
2917                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2918                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2919                                 i, strerror(errno) ));
2920                         goto fail;
2921                 }
2922
2923                 /*
2924                  * Only set the qualifier (user or group id) if the entry is a user
2925                  * or group id ACE.
2926                  */
2927
2928                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2929                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.id) == -1) {
2930                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2931                                         i, strerror(errno) ));
2932                                 goto fail;
2933                         }
2934                 }
2935
2936                 /*
2937                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2938                  */
2939
2940                 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
2941                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2942                                 i, strerror(errno) ));
2943                         goto fail;
2944                 }
2945
2946                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2947                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2948                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2949                         goto fail;
2950                 }
2951
2952                 /*
2953                  * ..and apply them to the entry.
2954                  */
2955
2956                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2957                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2958                                 i, strerror(errno) ));
2959                         goto fail;
2960                 }
2961
2962                 if( DEBUGLVL( 10 ))
2963                         print_canon_ace( p_ace, i);
2964
2965         }
2966
2967         if (needs_mask && !got_mask_entry) {
2968                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2969                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2970                         goto fail;
2971                 }
2972
2973                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2974                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2975                         goto fail;
2976                 }
2977
2978                 if (sys_acl_get_permset(mask_entry, &mask_permset) == -1) {
2979                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2980                         goto fail;
2981                 }
2982
2983                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2984                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2985                         goto fail;
2986                 }
2987
2988                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2989                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2990                         goto fail;
2991                 }
2992         }
2993
2994         /*
2995          * Finally apply it to the file or directory.
2996          */
2997
2998         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2999                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
3000                                              the_acl_type, the_acl) == -1) {
3001                         /*
3002                          * Some systems allow all the above calls and only fail with no ACL support
3003                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3004                          */
3005                         if (no_acl_syscall_error(errno)) {
3006                                 *pacl_set_support = False;
3007                         }
3008
3009                         if (acl_group_override(conn, fsp->fsp_name)) {
3010                                 int sret;
3011
3012                                 DEBUG(5,("set_canon_ace_list: acl group "
3013                                          "control on and current user in file "
3014                                          "%s primary group.\n",
3015                                          fsp_str_dbg(fsp)));
3016
3017                                 become_root();
3018                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
3019                                     fsp->fsp_name->base_name, the_acl_type,
3020                                     the_acl);
3021                                 unbecome_root();
3022                                 if (sret == 0) {
3023                                         ret = True;
3024                                 }
3025                         }
3026
3027                         if (ret == False) {
3028                                 DEBUG(2,("set_canon_ace_list: "
3029                                          "sys_acl_set_file type %s failed for "
3030                                          "file %s (%s).\n",
3031                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
3032                                          "directory default" : "file",
3033                                          fsp_str_dbg(fsp), strerror(errno)));
3034                                 goto fail;
3035                         }
3036                 }
3037         } else {
3038                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
3039                         /*
3040                          * Some systems allow all the above calls and only fail with no ACL support
3041                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3042                          */
3043                         if (no_acl_syscall_error(errno)) {
3044                                 *pacl_set_support = False;
3045                         }
3046
3047                         if (acl_group_override(conn, fsp->fsp_name)) {
3048                                 int sret;
3049
3050                                 DEBUG(5,("set_canon_ace_list: acl group "
3051                                          "control on and current user in file "
3052                                          "%s primary group.\n",
3053                                          fsp_str_dbg(fsp)));
3054
3055                                 become_root();
3056                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
3057                                 unbecome_root();
3058                                 if (sret == 0) {
3059                                         ret = True;
3060                                 }
3061                         }
3062
3063                         if (ret == False) {
3064                                 DEBUG(2,("set_canon_ace_list: "
3065                                          "sys_acl_set_file failed for file %s "
3066                                          "(%s).\n",
3067                                          fsp_str_dbg(fsp), strerror(errno)));
3068                                 goto fail;
3069                         }
3070                 }
3071         }
3072
3073         ret = True;
3074
3075   fail:
3076
3077         if (the_acl != NULL) {
3078                 sys_acl_free_acl(the_acl);
3079         }
3080
3081         return ret;
3082 }
3083
3084 /****************************************************************************
3085  Find a particular canon_ace entry.
3086 ****************************************************************************/
3087
3088 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, struct unixid *id)
3089 {
3090         while (list) {
3091                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
3092                                 (type == SMB_ACL_USER  && id && id->id == list->unix_ug.id) ||
3093                                 (type == SMB_ACL_GROUP && id && id->id == list->unix_ug.id)))
3094                         break;
3095                 list = list->next;
3096         }
3097         return list;
3098 }
3099
3100 /****************************************************************************
3101
3102 ****************************************************************************/
3103
3104 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
3105 {
3106         SMB_ACL_ENTRY_T entry;
3107
3108         if (!the_acl)
3109                 return NULL;
3110         if (sys_acl_get_entry(the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
3111                 sys_acl_free_acl(the_acl);
3112                 return NULL;
3113         }
3114         return the_acl;
3115 }
3116
3117 /****************************************************************************
3118  Convert a canon_ace to a generic 3 element permission - if possible.
3119 ****************************************************************************/
3120
3121 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3122
3123 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3124 {
3125         int snum = SNUM(fsp->conn);
3126         size_t ace_count = count_canon_ace_list(file_ace_list);
3127         canon_ace *ace_p;
3128         canon_ace *owner_ace = NULL;
3129         canon_ace *group_ace = NULL;
3130         canon_ace *other_ace = NULL;
3131         mode_t and_bits;
3132         mode_t or_bits;
3133
3134         if (ace_count != 3) {
3135                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3136                          "entries for file %s to convert to posix perms.\n",
3137                          fsp_str_dbg(fsp)));
3138                 return False;
3139         }
3140
3141         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3142                 if (ace_p->owner_type == UID_ACE)
3143                         owner_ace = ace_p;
3144                 else if (ace_p->owner_type == GID_ACE)
3145                         group_ace = ace_p;
3146                 else if (ace_p->owner_type == WORLD_ACE)
3147                         other_ace = ace_p;
3148         }
3149
3150         if (!owner_ace || !group_ace || !other_ace) {
3151                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3152                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3153                 return False;
3154         }
3155
3156         *posix_perms = (mode_t)0;
3157
3158         *posix_perms |= owner_ace->perms;
3159         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3160         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3161         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3162         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3163         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3164         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3165
3166         /* The owner must have at least read access. */
3167
3168         *posix_perms |= S_IRUSR;
3169         if (fsp->is_directory)
3170                 *posix_perms |= (S_IWUSR|S_IXUSR);
3171
3172         /* If requested apply the masks. */
3173
3174         /* Get the initial bits to apply. */
3175
3176         if (fsp->is_directory) {
3177                 and_bits = lp_dir_security_mask(snum);
3178                 or_bits = lp_force_dir_security_mode(snum);
3179         } else {
3180                 and_bits = lp_security_mask(snum);
3181                 or_bits = lp_force_security_mode(snum);
3182         }
3183
3184         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3185
3186         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3187                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3188                   (int)group_ace->perms, (int)other_ace->perms,
3189                   (int)*posix_perms, fsp_str_dbg(fsp)));
3190
3191         return True;
3192 }
3193
3194 /****************************************************************************
3195   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3196   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3197   with CI|OI set so it is inherited and also applies to the directory.
3198   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3199 ****************************************************************************/
3200
3201 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3202 {
3203         size_t i, j;
3204
3205         for (i = 0; i < num_aces; i++) {
3206                 for (j = i+1; j < num_aces; j++) {
3207                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3208                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3209                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3210                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3211
3212                         /* We know the lower number ACE's are file entries. */
3213                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3214                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3215                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3216                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3217                                 (i_inh == j_inh) &&
3218                                 (i_flags_ni == 0) &&
3219                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3220                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3221                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3222                                 /*
3223                                  * W2K wants to have access allowed zero access ACE's
3224                                  * at the end of the list. If the mask is zero, merge
3225                                  * the non-inherited ACE onto the inherited ACE.
3226                                  */
3227
3228                                 if (nt_ace_list[i].access_mask == 0) {
3229                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3230                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3231                                         if (num_aces - i - 1 > 0)
3232                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3233                                                                 sizeof(struct security_ace));
3234
3235                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3236                                                 (unsigned int)i, (unsigned int)j ));
3237                                 } else {
3238                                         /*
3239                                          * These are identical except for the flags.
3240                                          * Merge the inherited ACE onto the non-inherited ACE.
3241                                          */
3242
3243                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3244                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3245                                         if (num_aces - j - 1 > 0)
3246                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3247                                                                 sizeof(struct security_ace));
3248
3249                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3250                                                 (unsigned int)j, (unsigned int)i ));
3251                                 }
3252                                 num_aces--;
3253                                 break;
3254                         }
3255                 }
3256         }
3257
3258         return num_aces;
3259 }
3260
3261 /*
3262  * Add or Replace ACE entry.
3263  * In some cases we need to add a specific ACE for compatibility reasons.
3264  * When doing that we must make sure we are not actually creating a duplicate
3265  * entry. So we need to search whether an ACE entry already exist and eventually
3266  * replacce the access mask, or add a completely new entry if none was found.
3267  *
3268  * This function assumes the array has enough space to add a new entry without
3269  * any reallocation of memory.
3270  */
3271
3272 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3273                                 const struct dom_sid *sid, enum security_ace_type type,
3274                                 uint32_t mask, uint8_t flags)
3275 {
3276         int i;
3277
3278         /* first search for a duplicate */
3279         for (i = 0; i < *num_aces; i++) {
3280                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3281                     (nt_ace_list[i].flags == flags)) break;
3282         }
3283
3284         if (i < *num_aces) { /* found */
3285                 nt_ace_list[i].type = type;
3286                 nt_ace_list[i].access_mask = mask;
3287                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3288                            i, sid_string_dbg(sid), flags));
3289                 return;
3290         }
3291
3292         /* not found, append it */
3293         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3294 }
3295
3296
3297 /****************************************************************************
3298  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3299  the space for the return elements and returns the size needed to return the
3300  security descriptor. This should be the only external function needed for
3301  the UNIX style get ACL.
3302 ****************************************************************************/
3303
3304 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3305                                       const char *name,
3306                                       const SMB_STRUCT_STAT *sbuf,
3307                                       struct pai_val *pal,
3308                                       SMB_ACL_T posix_acl,
3309                                       SMB_ACL_T def_acl,
3310                                       uint32_t security_info,
3311                                       struct security_descriptor **ppdesc)
3312 {
3313         struct dom_sid owner_sid;
3314         struct dom_sid group_sid;
3315         size_t sd_size = 0;
3316         struct security_acl *psa = NULL;
3317         size_t num_acls = 0;
3318         size_t num_def_acls = 0;
3319         size_t num_aces = 0;
3320         canon_ace *file_ace = NULL;
3321         canon_ace *dir_ace = NULL;
3322         struct security_ace *nt_ace_list = NULL;
3323         size_t num_profile_acls = 0;
3324         struct dom_sid orig_owner_sid;
3325         struct security_descriptor *psd = NULL;
3326         int i;
3327
3328         /*
3329          * Get the owner, group and world SIDs.
3330          */
3331
3332         create_file_sids(sbuf, &owner_sid, &group_sid);
3333
3334         if (lp_profile_acls(SNUM(conn))) {
3335                 /* For WXP SP1 the owner must be administrators. */
3336                 sid_copy(&orig_owner_sid, &owner_sid);
3337                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3338                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3339                 num_profile_acls = 3;
3340         }
3341
3342         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3343
3344                 /*
3345                  * In the optimum case Creator Owner and Creator Group would be used for
3346                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3347                  * would lead to usability problems under Windows: The Creator entries
3348                  * are only available in browse lists of directories and not for files;
3349                  * additionally the identity of the owning group couldn't be determined.
3350                  * We therefore use those identities only for Default ACLs.
3351                  */
3352
3353                 /* Create the canon_ace lists. */
3354                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3355                                             &owner_sid, &group_sid, pal,
3356                                             SMB_ACL_TYPE_ACCESS);
3357
3358                 /* We must have *some* ACLS. */
3359
3360                 if (count_canon_ace_list(file_ace) == 0) {
3361                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3362                         goto done;
3363                 }
3364
3365                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3366                         dir_ace = canonicalise_acl(conn, name, def_acl,
3367                                                    sbuf,
3368                                                    &global_sid_Creator_Owner,
3369                                                    &global_sid_Creator_Group,
3370                                                    pal, SMB_ACL_TYPE_DEFAULT);
3371                 }
3372
3373                 /*
3374                  * Create the NT ACE list from the canonical ace lists.
3375                  */
3376
3377                 {
3378                         canon_ace *ace;
3379                         enum security_ace_type nt_acl_type;
3380
3381                         if (nt4_compatible_acls() && dir_ace) {
3382                                 /*
3383                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3384                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3385                                  * remove entries from the Access ACL if the
3386                                  * corresponding Default ACL entries have also been
3387                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3388                                  * are exceptions. We can do nothing
3389                                  * intelligent if the Default ACL contains entries that
3390                                  * are not also contained in the Access ACL, so this
3391                                  * case will still fail under NT 4.
3392                                  */
3393
3394                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3395                                 if (ace && !ace->perms) {
3396                                         DLIST_REMOVE(dir_ace, ace);
3397                                         TALLOC_FREE(ace);
3398
3399                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3400                                         if (ace && !ace->perms) {
3401                                                 DLIST_REMOVE(file_ace, ace);
3402                                                 TALLOC_FREE(ace);
3403                                         }
3404                                 }
3405
3406                                 /*
3407                                  * WinNT doesn't usually have Creator Group
3408                                  * in browse lists, so we send this entry to
3409                                  * WinNT even if it contains no relevant
3410                                  * permissions. Once we can add
3411                                  * Creator Group to browse lists we can
3412                                  * re-enable this.
3413                                  */
3414
3415 #if 0
3416                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3417                                 if (ace && !ace->perms) {
3418                                         DLIST_REMOVE(dir_ace, ace);
3419                                         TALLOC_FREE(ace);
3420                                 }
3421 #endif
3422
3423                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3424                                 if (ace && !ace->perms) {
3425                                         DLIST_REMOVE(file_ace, ace);
3426                                         TALLOC_FREE(ace);
3427                                 }
3428                         }
3429
3430                         num_acls = count_canon_ace_list(file_ace);
3431                         num_def_acls = count_canon_ace_list(dir_ace);
3432
3433                         /* Allocate the ace list. */
3434                         if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3435                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3436                                 goto done;
3437                         }
3438
3439                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3440
3441                         /*
3442                          * Create the NT ACE list from the canonical ace lists.
3443                          */
3444
3445                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3446                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3447                                                 &nt_acl_type,
3448                                                 ace->perms,
3449                                                 S_ISDIR(sbuf->st_ex_mode));
3450                                 init_sec_ace(&nt_ace_list[num_aces++],
3451                                         &ace->trustee,
3452                                         nt_acl_type,
3453                                         acc,
3454                                         ace->ace_flags);
3455                         }
3456
3457                         /* The User must have access to a profile share - even
3458                          * if we can't map the SID. */
3459                         if (lp_profile_acls(SNUM(conn))) {
3460                                 add_or_replace_ace(nt_ace_list, &num_aces,
3461                                                    &global_sid_Builtin_Users,
3462                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3463                                                    FILE_GENERIC_ALL, 0);
3464                         }
3465
3466                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3467                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3468                                                 &nt_acl_type,
3469                                                 ace->perms,
3470                                                 S_ISDIR(sbuf->st_ex_mode));
3471                                 init_sec_ace(&nt_ace_list[num_aces++],
3472                                         &ace->trustee,
3473                                         nt_acl_type,
3474                                         acc,
3475                                         ace->ace_flags |
3476                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3477                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3478                                         SEC_ACE_FLAG_INHERIT_ONLY);
3479                         }
3480
3481                         /* The User must have access to a profile share - even
3482                          * if we can't map the SID. */
3483                         if (lp_profile_acls(SNUM(conn))) {
3484                                 add_or_replace_ace(nt_ace_list, &num_aces,
3485                                                 &global_sid_Builtin_Users,
3486                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3487                                                 FILE_GENERIC_ALL,
3488                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3489                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3490                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3491                         }
3492
3493                         /*
3494                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3495                          * Win2K needs this to get the inheritance correct when replacing ACLs
3496                          * on a directory tree. Based on work by Jim @ IBM.
3497                          */
3498
3499                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3500
3501                         if (lp_profile_acls(SNUM(conn))) {
3502                                 for (i = 0; i < num_aces; i++) {
3503                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3504                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3505                                                                    &orig_owner_sid,
3506                                                                    nt_ace_list[i].type,
3507                                                                    nt_ace_list[i].access_mask,
3508                                                                    nt_ace_list[i].flags);
3509                                                 break;
3510                                         }
3511                                 }
3512                         }
3513                 }
3514
3515                 if (num_aces) {
3516                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3517                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3518                                 goto done;
3519                         }
3520                 }
3521         } /* security_info & SECINFO_DACL */
3522
3523         psd = make_standard_sec_desc( talloc_tos(),
3524                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3525                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3526                         psa,
3527                         &sd_size);
3528
3529         if(!psd) {
3530                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3531                 sd_size = 0;
3532                 goto done;
3533         }
3534
3535         /*
3536          * Windows 2000: The DACL_PROTECTED flag in the security
3537          * descriptor marks the ACL as non-inheriting, i.e., no
3538          * ACEs from higher level directories propagate to this
3539          * ACL. In the POSIX ACL model permissions are only
3540          * inherited at file create time, so ACLs never contain
3541          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3542          * flag doesn't seem to bother Windows NT.
3543          * Always set this if map acl inherit is turned off.
3544          */
3545         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3546                 psd->type |= SEC_DESC_DACL_PROTECTED;
3547         } else {
3548                 psd->type |= pal->sd_type;
3549         }
3550
3551         if (psd->dacl) {
3552                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3553         }
3554
3555         *ppdesc = psd;
3556
3557  done:
3558
3559         if (posix_acl) {
3560                 sys_acl_free_acl(posix_acl);
3561         }
3562         if (def_acl) {
3563                 sys_acl_free_acl(def_acl);
3564         }
3565         free_canon_ace_list(file_ace);
3566         free_canon_ace_list(dir_ace);
3567         free_inherited_info(pal);
3568         TALLOC_FREE(nt_ace_list);
3569
3570         return NT_STATUS_OK;
3571 }
3572
3573 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3574                            struct security_descriptor **ppdesc)
3575 {
3576         SMB_STRUCT_STAT sbuf;
3577         SMB_ACL_T posix_acl = NULL;
3578         struct pai_val *pal;
3579
3580         *ppdesc = NULL;
3581
3582         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3583                   fsp_str_dbg(fsp)));
3584
3585         /* can it happen that fsp_name == NULL ? */
3586         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3587                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3588                                         security_info, ppdesc);
3589         }
3590
3591         /* Get the stat struct for the owner info. */
3592         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3593                 return map_nt_error_from_unix(errno);
3594         }
3595
3596         /* Get the ACL from the fd. */
3597         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3598
3599         pal = fload_inherited_info(fsp);
3600
3601         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3602                                        &sbuf, pal, posix_acl, NULL,
3603                                        security_info, ppdesc);
3604 }
3605
3606 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3607                           uint32_t security_info, struct security_descriptor **ppdesc)
3608 {
3609         SMB_ACL_T posix_acl = NULL;
3610         SMB_ACL_T def_acl = NULL;
3611         struct pai_val *pal;
3612         struct smb_filename smb_fname;
3613         int ret;
3614
3615         *ppdesc = NULL;
3616
3617         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3618
3619         ZERO_STRUCT(smb_fname);
3620         smb_fname.base_name = discard_const_p(char, name);
3621
3622         /* Get the stat struct for the owner info. */
3623         if (lp_posix_pathnames()) {
3624                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3625         } else {
3626                 ret = SMB_VFS_STAT(conn, &smb_fname);
3627         }
3628
3629         if (ret == -1) {
3630                 return map_nt_error_from_unix(errno);
3631         }
3632
3633         /* Get the ACL from the path. */
3634         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3635
3636         /* If it's a directory get the default POSIX ACL. */
3637         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3638                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3639                 def_acl = free_empty_sys_acl(conn, def_acl);
3640         }
3641
3642         pal = load_inherited_info(conn, name);
3643
3644         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3645                                        posix_acl, def_acl, security_info,
3646                                        ppdesc);
3647 }
3648
3649 /****************************************************************************
3650  Try to chown a file. We will be able to chown it under the following conditions.
3651
3652   1) If we have root privileges, then it will just work.
3653   2) If we have SeRestorePrivilege we can change the user + group to any other user.
3654   3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3655   4) If we have write permission to the file and dos_filemodes is set
3656      then allow chown to the currently authenticated user.
3657 ****************************************************************************/
3658
3659 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3660 {
3661         NTSTATUS status;
3662
3663         if(!CAN_WRITE(fsp->conn)) {
3664                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3665         }
3666
3667         /* Case (1). */
3668         status = vfs_chown_fsp(fsp, uid, gid);
3669         if (NT_STATUS_IS_OK(status)) {
3670                 return status;
3671         }
3672
3673         /* Case (2) / (3) */
3674         if (lp_enable_privileges()) {
3675                 bool has_take_ownership_priv = security_token_has_privilege(
3676                                                 get_current_nttok(fsp->conn),
3677                                                 SEC_PRIV_TAKE_OWNERSHIP);
3678                 bool has_restore_priv = security_token_has_privilege(
3679                                                 get_current_nttok(fsp->conn),
3680                                                 SEC_PRIV_RESTORE);
3681
3682                 if (has_restore_priv) {
3683                         ; /* Case (2) */
3684                 } else if (has_take_ownership_priv) {
3685                         /* Case (3) */
3686                         if (uid == get_current_uid(fsp->conn)) {
3687                                 gid = (gid_t)-1;
3688                         } else {
3689                                 has_take_ownership_priv = false;
3690                         }
3691                 }
3692
3693                 if (has_take_ownership_priv || has_restore_priv) {
3694                         become_root();
3695                         status = vfs_chown_fsp(fsp, uid, gid);
3696                         unbecome_root();
3697                         return status;
3698                 }
3699         }
3700
3701         /* Case (4). */
3702         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3703                 return NT_STATUS_ACCESS_DENIED;
3704         }
3705
3706         /* only allow chown to the current user. This is more secure,
3707            and also copes with the case where the SID in a take ownership ACL is
3708            a local SID on the users workstation
3709         */
3710         if (uid != get_current_uid(fsp->conn)) {
3711                 return NT_STATUS_ACCESS_DENIED;
3712         }
3713
3714         become_root();
3715         /* Keep the current file gid the same. */
3716         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3717         unbecome_root();
3718
3719         return status;
3720 }
3721
3722 #if 0
3723 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3724
3725 /****************************************************************************
3726  Take care of parent ACL inheritance.
3727 ****************************************************************************/
3728
3729 NTSTATUS append_parent_acl(files_struct *fsp,
3730                                 const struct security_descriptor *pcsd,
3731                                 struct security_descriptor **pp_new_sd)
3732 {
3733         struct smb_filename *smb_dname = NULL;
3734         struct security_descriptor *parent_sd = NULL;
3735         files_struct *parent_fsp = NULL;
3736         TALLOC_CTX *mem_ctx = talloc_tos();
3737         char *parent_name = NULL;
3738         struct security_ace *new_ace = NULL;
3739         unsigned int num_aces = pcsd->dacl->num_aces;
3740         NTSTATUS status;
3741         int info;
3742         unsigned int i, j;
3743         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3744         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3745
3746         if (psd == NULL) {
3747                 return NT_STATUS_NO_MEMORY;
3748         }
3749
3750         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3751                             NULL)) {
3752                 return NT_STATUS_NO_MEMORY;
3753         }
3754
3755         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3756                                             &smb_dname);
3757         if (!NT_STATUS_IS_OK(status)) {
3758                 goto fail;
3759         }
3760
3761         status = SMB_VFS_CREATE_FILE(
3762                 fsp->conn,                              /* conn */
3763                 NULL,                                   /* req */
3764                 0,                                      /* root_dir_fid */
3765                 smb_dname,                              /* fname */
3766                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3767                 FILE_SHARE_NONE,                        /* share_access */
3768                 FILE_OPEN,                              /* create_disposition*/
3769                 FILE_DIRECTORY_FILE,                    /* create_options */
3770                 0,                                      /* file_attributes */
3771                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3772                 0,                                      /* allocation_size */
3773                 NULL,                                   /* sd */
3774                 NULL,                                   /* ea_list */
3775                 &parent_fsp,                            /* result */
3776                 &info);                                 /* pinfo */
3777
3778         if (!NT_STATUS_IS_OK(status)) {
3779                 TALLOC_FREE(smb_dname);
3780                 return status;
3781         }
3782
3783         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3784                                     SECINFO_DACL, &parent_sd );
3785
3786         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3787         TALLOC_FREE(smb_dname);
3788
3789         if (!NT_STATUS_IS_OK(status)) {
3790                 return status;
3791         }
3792
3793         /*
3794          * Make room for potentially all the ACLs from
3795          * the parent. We used to add the ugw triple here,
3796          * as we knew we were dealing with POSIX ACLs.
3797          * We no longer need to do so as we can guarentee
3798          * that a default ACL from the parent directory will
3799          * be well formed for POSIX ACLs if it came from a
3800          * POSIX ACL source, and if we're not writing to a
3801          * POSIX ACL sink then we don't care if it's not well
3802          * formed. JRA.
3803          */
3804
3805         num_aces += parent_sd->dacl->num_aces;
3806
3807         if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3808                                         num_aces)) == NULL) {
3809                 return NT_STATUS_NO_MEMORY;
3810         }
3811
3812         /* Start by copying in all the given ACE entries. */
3813         for (i = 0; i < psd->dacl->num_aces; i++) {
3814                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3815         }
3816
3817         /*
3818          * Note that we're ignoring "inherit permissions" here
3819          * as that really only applies to newly created files. JRA.
3820          */
3821
3822         /* Finally append any inherited ACEs. */
3823         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3824                 struct security_ace *se = &parent_sd->dacl->aces[j];
3825
3826                 if (fsp->is_directory) {
3827                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3828                                 /* Doesn't apply to a directory - ignore. */
3829                                 DEBUG(10,("append_parent_acl: directory %s "
3830                                         "ignoring non container "
3831                                         "inherit flags %u on ACE with sid %s "
3832                                         "from parent %s\n",
3833                                         fsp_str_dbg(fsp),
3834                                         (unsigned int)se->flags,
3835                                         sid_string_dbg(&se->trustee),
3836                                         parent_name));
3837                                 continue;
3838                         }
3839                 } else {
3840                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3841                                 /* Doesn't apply to a file - ignore. */
3842                                 DEBUG(10,("append_parent_acl: file %s "
3843                                         "ignoring non object "
3844                                         "inherit flags %u on ACE with sid %s "
3845                                         "from parent %s\n",
3846                                         fsp_str_dbg(fsp),
3847                                         (unsigned int)se->flags,
3848                                         sid_string_dbg(&se->trustee),
3849                                         parent_name));
3850                                 continue;
3851                         }
3852                 }
3853
3854                 if (is_dacl_protected) {
3855                         /* If the DACL is protected it means we must
3856                          * not overwrite an existing ACE entry with the
3857                          * same SID. This is order N^2. Ouch :-(. JRA. */
3858                         unsigned int k;
3859                         for (k = 0; k < psd->dacl->num_aces; k++) {
3860                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3861                                                 &se->trustee)) {
3862                                         break;
3863                                 }
3864                         }
3865                         if (k < psd->dacl->num_aces) {
3866                                 /* SID matched. Ignore. */
3867                                 DEBUG(10,("append_parent_acl: path %s "
3868                                         "ignoring ACE with protected sid %s "
3869                                         "from parent %s\n",
3870                                         fsp_str_dbg(fsp),
3871                                         sid_string_dbg(&se->trustee),
3872                                         parent_name));
3873                                 continue;
3874                         }
3875                 }
3876
3877                 sec_ace_copy(&new_ace[i], se);
3878                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3879                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3880                 }
3881                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3882
3883                 if (fsp->is_directory) {
3884                         /*
3885                          * Strip off any inherit only. It's applied.
3886                          */
3887                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3888                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3889                                 /* No further inheritance. */
3890                                 new_ace[i].flags &=
3891                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3892                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3893                         }
3894                 } else {
3895                         /*
3896                          * Strip off any container or inherit
3897                          * flags, they can't apply to objects.
3898                          */
3899                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3900                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3901                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3902                 }
3903                 i++;
3904
3905                 DEBUG(10,("append_parent_acl: path %s "
3906                         "inheriting ACE with sid %s "
3907                         "from parent %s\n",
3908                         fsp_str_dbg(fsp),
3909                         sid_string_dbg(&se->trustee),
3910                         parent_name));
3911         }
3912
3913         psd->dacl->aces = new_ace;
3914         psd->dacl->num_aces = i;
3915         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3916                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
3917
3918         *pp_new_sd = psd;
3919         return status;
3920 }
3921 #endif
3922
3923 /****************************************************************************
3924  Reply to set a security descriptor on an fsp. security_info_sent is the
3925  description of the following NT ACL.
3926  This should be the only external function needed for the UNIX style set ACL.
3927  We make a copy of psd_orig as internal functions modify the elements inside
3928  it, even though it's a const pointer.
3929 ****************************************************************************/
3930
3931 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3932 {
3933         connection_struct *conn = fsp->conn;
3934         uid_t user = (uid_t)-1;
3935         gid_t grp = (gid_t)-1;
3936         struct dom_sid file_owner_sid;
3937         struct dom_sid file_grp_sid;
3938         canon_ace *file_ace_list = NULL;
3939         canon_ace *dir_ace_list = NULL;
3940         bool acl_perms = False;
3941         mode_t orig_mode = (mode_t)0;
3942         NTSTATUS status;
3943         bool set_acl_as_root = false;
3944         bool acl_set_support = false;
3945         bool ret = false;
3946         struct security_descriptor *psd = NULL;
3947
3948         DEBUG(10,("set_nt_acl: called for file %s\n",
3949                   fsp_str_dbg(fsp)));
3950
3951         if (!CAN_WRITE(conn)) {
3952                 DEBUG(10,("set acl rejected on read-only share\n"));
3953                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3954         }
3955
3956         if (!psd_orig) {
3957                 return NT_STATUS_INVALID_PARAMETER;
3958         }
3959
3960         psd = dup_sec_desc(talloc_tos(), psd_orig);
3961         if (!psd) {
3962                 return NT_STATUS_NO_MEMORY;
3963         }
3964
3965         /*
3966          * Get the current state of the file.
3967          */
3968
3969         status = vfs_stat_fsp(fsp);
3970         if (!NT_STATUS_IS_OK(status)) {
3971                 return status;
3972         }
3973
3974         /* Save the original element we check against. */
3975         orig_mode = fsp->fsp_name->st.st_ex_mode;
3976
3977         /*
3978          * Unpack the user/group/world id's.
3979          */
3980
3981         /* POSIX can't cope with missing owner/group. */
3982         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3983                 security_info_sent &= ~SECINFO_OWNER;
3984         }
3985         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3986                 security_info_sent &= ~SECINFO_GROUP;
3987         }
3988
3989         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3990         if (!NT_STATUS_IS_OK(status)) {
3991                 return status;
3992         }
3993
3994         /*
3995          * Do we need to chown ? If so this must be done first as the incoming
3996          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3997          * Noticed by Simo.
3998          */
3999
4000         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
4001             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
4002
4003                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
4004                          fsp_str_dbg(fsp), (unsigned int)user,
4005                          (unsigned int)grp));
4006
4007                 status = try_chown(fsp, user, grp);
4008                 if(!NT_STATUS_IS_OK(status)) {
4009                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
4010                                 "= %s.\n", fsp_str_dbg(fsp),
4011                                 (unsigned int)user,
4012                                 (unsigned int)grp,
4013                                 nt_errstr(status)));
4014                         return status;
4015                 }
4016
4017                 /*
4018                  * Recheck the current state of the file, which may have changed.
4019                  * (suid/sgid bits, for instance)
4020                  */
4021
4022                 status = vfs_stat_fsp(fsp);
4023                 if (!NT_STATUS_IS_OK(status)) {
4024                         return status;
4025                 }
4026
4027                 /* Save the original element we check against. */
4028                 orig_mode = fsp->fsp_name->st.st_ex_mode;
4029
4030                 /* If we successfully chowned, we know we must
4031                  * be able to set the acl, so do it as root.
4032                  */
4033                 set_acl_as_root = true;
4034         }
4035
4036         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
4037
4038         if((security_info_sent & SECINFO_DACL) &&
4039                         (psd->type & SEC_DESC_DACL_PRESENT) &&
4040                         (psd->dacl == NULL)) {
4041                 struct security_ace ace[3];
4042
4043                 /* We can't have NULL DACL in POSIX.
4044                    Use owner/group/Everyone -> full access. */
4045
4046                 init_sec_ace(&ace[0],
4047                                 &file_owner_sid,
4048                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4049                                 GENERIC_ALL_ACCESS,
4050                                 0);
4051                 init_sec_ace(&ace[1],
4052                                 &file_grp_sid,
4053                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4054                                 GENERIC_ALL_ACCESS,
4055                                 0);
4056                 init_sec_ace(&ace[2],
4057                                 &global_sid_World,
4058                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4059                                 GENERIC_ALL_ACCESS,
4060                                 0);
4061                 psd->dacl = make_sec_acl(talloc_tos(),
4062                                         NT4_ACL_REVISION,
4063                                         3,
4064                                         ace);
4065                 if (psd->dacl == NULL) {
4066                         return NT_STATUS_NO_MEMORY;
4067                 }
4068                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
4069         }
4070
4071         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
4072                                      &file_grp_sid, &file_ace_list,
4073                                      &dir_ace_list, security_info_sent, psd);
4074
4075         /* Ignore W2K traverse DACL set. */
4076         if (!file_ace_list && !dir_ace_list) {
4077                 return NT_STATUS_OK;
4078         }
4079
4080         if (!acl_perms) {
4081                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
4082                 free_canon_ace_list(file_ace_list);
4083                 free_canon_ace_list(dir_ace_list);
4084                 return NT_STATUS_ACCESS_DENIED;
4085         }
4086
4087         /*
4088          * Only change security if we got a DACL.
4089          */
4090
4091         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
4092                 free_canon_ace_list(file_ace_list);
4093                 free_canon_ace_list(dir_ace_list);
4094                 return NT_STATUS_OK;
4095         }
4096
4097         /*
4098          * Try using the POSIX ACL set first. Fall back to chmod if
4099          * we have no ACL support on this filesystem.
4100          */
4101
4102         if (acl_perms && file_ace_list) {
4103                 if (set_acl_as_root) {
4104                         become_root();
4105                 }
4106                 ret = set_canon_ace_list(fsp, file_ace_list, false,
4107                                          &fsp->fsp_name->st, &acl_set_support);
4108                 if (set_acl_as_root) {
4109                         unbecome_root();
4110                 }
4111                 if (acl_set_support && ret == false) {
4112                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
4113                                  "%s (%s).\n", fsp_str_dbg(fsp),
4114                                  strerror(errno)));
4115                         free_canon_ace_list(file_ace_list);
4116                         free_canon_ace_list(dir_ace_list);
4117                         return map_nt_error_from_unix(errno);
4118                 }
4119         }
4120
4121         if (acl_perms && acl_set_support && fsp->is_directory) {
4122                 if (dir_ace_list) {
4123                         if (set_acl_as_root) {
4124                                 become_root();
4125                         }
4126                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
4127                                                  &fsp->fsp_name->st,
4128                                                  &acl_set_support);
4129                         if (set_acl_as_root) {
4130                                 unbecome_root();
4131                         }
4132                         if (ret == false) {
4133                                 DEBUG(3,("set_nt_acl: failed to set default "
4134                                          "acl on directory %s (%s).\n",
4135                                          fsp_str_dbg(fsp), strerror(errno)));
4136                                 free_canon_ace_list(file_ace_list);
4137                                 free_canon_ace_list(dir_ace_list);
4138                                 return map_nt_error_from_unix(errno);
4139                         }
4140                 } else {
4141                         int sret = -1;
4142
4143                         /*
4144                          * No default ACL - delete one if it exists.
4145                          */
4146
4147                         if (set_acl_as_root) {
4148                                 become_root();
4149                         }
4150                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4151                             fsp->fsp_name->base_name);
4152                         if (set_acl_as_root) {
4153                                 unbecome_root();
4154                         }
4155                         if (sret == -1) {
4156                                 if (acl_group_override(conn, fsp->fsp_name)) {
4157                                         DEBUG(5,("set_nt_acl: acl group "
4158                                                  "control on and current user "
4159                                                  "in file %s primary group. "
4160                                                  "Override delete_def_acl\n",
4161                                                  fsp_str_dbg(fsp)));
4162
4163                                         become_root();
4164                                         sret =
4165                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4166                                                     conn,
4167                                                     fsp->fsp_name->base_name);
4168                                         unbecome_root();
4169                                 }
4170
4171                                 if (sret == -1) {
4172                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4173                                         free_canon_ace_list(file_ace_list);
4174                                         free_canon_ace_list(dir_ace_list);
4175                                         return map_nt_error_from_unix(errno);
4176                                 }
4177                         }
4178                 }
4179         }
4180
4181         if (acl_set_support) {
4182                 if (set_acl_as_root) {
4183                         become_root();
4184                 }
4185                 store_inheritance_attributes(fsp,
4186                                 file_ace_list,
4187                                 dir_ace_list,
4188                                 psd->type);
4189                 if (set_acl_as_root) {
4190                         unbecome_root();
4191                 }
4192         }
4193
4194         /*
4195          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4196          */
4197
4198         if(!acl_set_support && acl_perms) {
4199                 mode_t posix_perms;
4200
4201                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4202                         free_canon_ace_list(file_ace_list);
4203                         free_canon_ace_list(dir_ace_list);
4204                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4205                                  "posix permissions for file %s.\n",
4206                                  fsp_str_dbg(fsp)));
4207                         return NT_STATUS_ACCESS_DENIED;
4208                 }
4209
4210                 if (orig_mode != posix_perms) {
4211                         int sret = -1;
4212
4213                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4214                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4215
4216                         if (set_acl_as_root) {
4217                                 become_root();
4218                         }
4219                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4220                                              posix_perms);
4221                         if (set_acl_as_root) {
4222                                 unbecome_root();
4223                         }
4224                         if(sret == -1) {
4225                                 if (acl_group_override(conn, fsp->fsp_name)) {
4226                                         DEBUG(5,("set_nt_acl: acl group "
4227                                                  "control on and current user "
4228                                                  "in file %s primary group. "
4229                                                  "Override chmod\n",
4230                                                  fsp_str_dbg(fsp)));
4231
4232                                         become_root();
4233                                         sret = SMB_VFS_CHMOD(conn,
4234                                             fsp->fsp_name->base_name,
4235                                             posix_perms);
4236                                         unbecome_root();
4237                                 }
4238
4239                                 if (sret == -1) {
4240                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4241                                                  "failed. Error = %s.\n",
4242                                                  fsp_str_dbg(fsp),
4243                                                  (unsigned int)posix_perms,
4244                                                  strerror(errno)));
4245                                         free_canon_ace_list(file_ace_list);
4246                                         free_canon_ace_list(dir_ace_list);
4247                                         return map_nt_error_from_unix(errno);
4248                                 }
4249                         }
4250                 }
4251         }
4252
4253         free_canon_ace_list(file_ace_list);
4254         free_canon_ace_list(dir_ace_list);
4255
4256         /* Ensure the stat struct in the fsp is correct. */
4257         status = vfs_stat_fsp(fsp);
4258
4259         return NT_STATUS_OK;
4260 }
4261
4262 /****************************************************************************
4263  Get the actual group bits stored on a file with an ACL. Has no effect if
4264  the file has no ACL. Needed in dosmode code where the stat() will return
4265  the mask bits, not the real group bits, for a file with an ACL.
4266 ****************************************************************************/
4267
4268 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4269 {
4270         int entry_id = SMB_ACL_FIRST_ENTRY;
4271         SMB_ACL_ENTRY_T entry;
4272         SMB_ACL_T posix_acl;
4273         int result = -1;
4274
4275         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4276         if (posix_acl == (SMB_ACL_T)NULL)
4277                 return -1;
4278
4279         while (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4280                 SMB_ACL_TAG_T tagtype;
4281                 SMB_ACL_PERMSET_T permset;
4282
4283                 entry_id = SMB_ACL_NEXT_ENTRY;
4284
4285                 if (sys_acl_get_tag_type(entry, &tagtype) ==-1)
4286                         break;
4287
4288                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4289                         if (sys_acl_get_permset(entry, &permset) == -1) {
4290                                 break;
4291                         } else {
4292                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4293                                 *mode |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRGRP : 0);
4294                                 *mode |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4295                                 *mode |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4296                                 result = 0;
4297                                 break;
4298                         }
4299                 }
4300         }
4301         sys_acl_free_acl(posix_acl);
4302         return result;
4303 }
4304
4305 /****************************************************************************
4306  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4307  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4308 ****************************************************************************/
4309
4310 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4311 {
4312         int entry_id = SMB_ACL_FIRST_ENTRY;
4313         SMB_ACL_ENTRY_T entry;
4314         int num_entries = 0;
4315
4316         while ( sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4317                 SMB_ACL_TAG_T tagtype;
4318                 SMB_ACL_PERMSET_T permset;
4319                 mode_t perms;
4320
4321                 entry_id = SMB_ACL_NEXT_ENTRY;
4322
4323                 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
4324                         return -1;
4325
4326                 if (sys_acl_get_permset(entry, &permset) == -1)
4327                         return -1;
4328
4329                 num_entries++;
4330
4331                 switch(tagtype) {
4332                         case SMB_ACL_USER_OBJ:
4333                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4334                                 break;
4335                         case SMB_ACL_GROUP_OBJ:
4336                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4337                                 break;
4338                         case SMB_ACL_MASK:
4339                                 /*
4340                                  * FIXME: The ACL_MASK entry permissions should really be set to
4341                                  * the union of the permissions of all ACL_USER,
4342                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4343                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4344                                  */
4345                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4346                                 break;
4347                         case SMB_ACL_OTHER:
4348                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4349                                 break;
4350                         default:
4351                                 continue;
4352                 }
4353
4354                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4355                         return -1;
4356
4357                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4358                         return -1;
4359         }
4360
4361         /*
4362          * If this is a simple 3 element ACL or no elements then it's a standard
4363          * UNIX permission set. Just use chmod...
4364          */
4365
4366         if ((num_entries == 3) || (num_entries == 0))
4367                 return -1;
4368
4369         return 0;
4370 }
4371
4372 /****************************************************************************
4373  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4374  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4375  resulting ACL on TO.  Note that name is in UNIX character set.
4376 ****************************************************************************/
4377
4378 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4379 {
4380         SMB_ACL_T posix_acl = NULL;
4381         int ret = -1;
4382
4383         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4384                 return -1;
4385
4386         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4387                 goto done;
4388
4389         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4390
4391  done:
4392
4393         sys_acl_free_acl(posix_acl);
4394         return ret;
4395 }
4396
4397 /****************************************************************************
4398  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4399  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4400  Note that name is in UNIX character set.
4401 ****************************************************************************/
4402
4403 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4404 {
4405         return copy_access_posix_acl(conn, name, name, mode);
4406 }
4407
4408 /****************************************************************************
4409  Check for an existing default POSIX ACL on a directory.
4410 ****************************************************************************/
4411
4412 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4413 {
4414         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4415         bool has_acl = False;
4416         SMB_ACL_ENTRY_T entry;
4417
4418         if (def_acl != NULL && (sys_acl_get_entry(def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4419                 has_acl = True;
4420         }
4421
4422         if (def_acl) {
4423                 sys_acl_free_acl(def_acl);
4424         }
4425         return has_acl;
4426 }
4427
4428 /****************************************************************************
4429  If the parent directory has no default ACL but it does have an Access ACL,
4430  inherit this Access ACL to file name.
4431 ****************************************************************************/
4432
4433 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4434                        const char *name, mode_t mode)
4435 {
4436         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4437                 return 0;
4438
4439         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4440 }
4441
4442 /****************************************************************************
4443  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4444  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4445 ****************************************************************************/
4446
4447 int fchmod_acl(files_struct *fsp, mode_t mode)
4448 {
4449         connection_struct *conn = fsp->conn;
4450         SMB_ACL_T posix_acl = NULL;
4451         int ret = -1;
4452
4453         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4454                 return -1;
4455
4456         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4457                 goto done;
4458
4459         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4460
4461   done:
4462
4463         sys_acl_free_acl(posix_acl);
4464         return ret;
4465 }
4466
4467 /****************************************************************************
4468  Map from wire type to permset.
4469 ****************************************************************************/
4470
4471 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4472 {
4473         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4474                 return False;
4475         }
4476
4477         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4478                 return False;
4479         }
4480
4481         if (wire_perm & SMB_POSIX_ACL_READ) {
4482                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4483                         return False;
4484                 }
4485         }
4486         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4487                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4488                         return False;
4489                 }
4490         }
4491         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4492                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4493                         return False;
4494                 }
4495         }
4496         return True;
4497 }
4498
4499 /****************************************************************************
4500  Map from wire type to tagtype.
4501 ****************************************************************************/
4502
4503 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4504 {
4505         switch (wire_tt) {
4506                 case SMB_POSIX_ACL_USER_OBJ:
4507                         *p_tt = SMB_ACL_USER_OBJ;
4508                         break;
4509                 case SMB_POSIX_ACL_USER:
4510                         *p_tt = SMB_ACL_USER;
4511                         break;
4512                 case SMB_POSIX_ACL_GROUP_OBJ:
4513                         *p_tt = SMB_ACL_GROUP_OBJ;
4514                         break;
4515                 case SMB_POSIX_ACL_GROUP:
4516                         *p_tt = SMB_ACL_GROUP;
4517                         break;
4518                 case SMB_POSIX_ACL_MASK:
4519                         *p_tt = SMB_ACL_MASK;
4520                         break;
4521                 case SMB_POSIX_ACL_OTHER:
4522                         *p_tt = SMB_ACL_OTHER;
4523                         break;
4524                 default:
4525                         return False;
4526         }
4527         return True;
4528 }
4529
4530 /****************************************************************************
4531  Create a new POSIX acl from wire permissions.
4532  FIXME ! How does the share mask/mode fit into this.... ?
4533 ****************************************************************************/
4534
4535 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4536 {
4537         unsigned int i;
4538         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4539
4540         if (the_acl == NULL) {
4541                 return NULL;
4542         }
4543
4544         for (i = 0; i < num_acls; i++) {
4545                 SMB_ACL_ENTRY_T the_entry;
4546                 SMB_ACL_PERMSET_T the_permset;
4547                 SMB_ACL_TAG_T tag_type;
4548
4549                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4550                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4551                                 i, strerror(errno) ));
4552                         goto fail;
4553                 }
4554
4555                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4556                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4557                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4558                         goto fail;
4559                 }
4560
4561                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4562                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4563                                 i, strerror(errno) ));
4564                         goto fail;
4565                 }
4566
4567                 /* Get the permset pointer from the new ACL entry. */
4568                 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
4569                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4570                                 i, strerror(errno) ));
4571                         goto fail;
4572                 }
4573
4574                 /* Map from wire to permissions. */
4575                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4576                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4577                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4578                         goto fail;
4579                 }
4580
4581                 /* Now apply to the new ACL entry. */
4582                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4583                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4584                                 i, strerror(errno) ));
4585                         goto fail;
4586                 }
4587
4588                 if (tag_type == SMB_ACL_USER) {
4589                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4590                         uid_t uid = (uid_t)uidval;
4591                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4592                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4593                                         (unsigned int)uid, i, strerror(errno) ));
4594                                 goto fail;
4595                         }
4596                 }
4597
4598                 if (tag_type == SMB_ACL_GROUP) {
4599                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4600                         gid_t gid = (uid_t)gidval;
4601                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4602                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4603                                         (unsigned int)gid, i, strerror(errno) ));
4604                                 goto fail;
4605                         }
4606                 }
4607         }
4608
4609         return the_acl;
4610
4611  fail:
4612
4613         if (the_acl != NULL) {
4614                 sys_acl_free_acl(the_acl);
4615         }
4616         return NULL;
4617 }
4618
4619 /****************************************************************************
4620  Calls from UNIX extensions - Default POSIX ACL set.
4621  If num_def_acls == 0 and not a directory just return. If it is a directory
4622  and num_def_acls == 0 then remove the default acl. Else set the default acl
4623  on the directory.
4624 ****************************************************************************/
4625
4626 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4627                                 uint16 num_def_acls, const char *pdata)
4628 {
4629         SMB_ACL_T def_acl = NULL;
4630
4631         if (!S_ISDIR(psbuf->st_ex_mode)) {
4632                 if (num_def_acls) {
4633                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4634                         errno = EISDIR;
4635                         return False;
4636                 } else {
4637                         return True;
4638                 }
4639         }
4640
4641         if (!num_def_acls) {
4642                 /* Remove the default ACL. */
4643                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4644                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4645                                 fname, strerror(errno) ));
4646                         return False;
4647                 }
4648                 return True;
4649         }
4650
4651         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4652                 return False;
4653         }
4654
4655         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4656                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4657                         fname, strerror(errno) ));
4658                 sys_acl_free_acl(def_acl);
4659                 return False;
4660         }
4661
4662         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4663         sys_acl_free_acl(def_acl);
4664         return True;
4665 }
4666
4667 /****************************************************************************
4668  Remove an ACL from a file. As we don't have acl_delete_entry() available
4669  we must read the current acl and copy all entries except MASK, USER and GROUP
4670  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4671  removed.
4672  FIXME ! How does the share mask/mode fit into this.... ?
4673 ****************************************************************************/
4674
4675 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4676 {
4677         SMB_ACL_T file_acl = NULL;
4678         int entry_id = SMB_ACL_FIRST_ENTRY;
4679         SMB_ACL_ENTRY_T entry;
4680         bool ret = False;
4681         /* Create a new ACL with only 3 entries, u/g/w. */
4682         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4683         SMB_ACL_ENTRY_T user_ent = NULL;
4684         SMB_ACL_ENTRY_T group_ent = NULL;
4685         SMB_ACL_ENTRY_T other_ent = NULL;
4686
4687         if (new_file_acl == NULL) {
4688                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4689                 return False;
4690         }
4691
4692         /* Now create the u/g/w entries. */
4693         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4694                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4695                         fname, strerror(errno) ));
4696                 goto done;
4697         }
4698         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4699                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4700                         fname, strerror(errno) ));
4701                 goto done;
4702         }
4703
4704         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4705                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4706                         fname, strerror(errno) ));
4707                 goto done;
4708         }
4709         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4710                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4711                         fname, strerror(errno) ));
4712                 goto done;
4713         }
4714
4715         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4716                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4717                         fname, strerror(errno) ));
4718                 goto done;
4719         }
4720         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4721                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4722                         fname, strerror(errno) ));
4723                 goto done;
4724         }
4725
4726         /* Get the current file ACL. */
4727         if (fsp && fsp->fh->fd != -1) {
4728                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4729         } else {
4730                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4731         }
4732
4733         if (file_acl == NULL) {
4734                 /* This is only returned if an error occurred. Even for a file with
4735                    no acl a u/g/w acl should be returned. */
4736                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4737                         fname, strerror(errno) ));
4738                 goto done;
4739         }
4740
4741         while ( sys_acl_get_entry(file_acl, entry_id, &entry) == 1) {
4742                 SMB_ACL_TAG_T tagtype;
4743                 SMB_ACL_PERMSET_T permset;
4744
4745                 entry_id = SMB_ACL_NEXT_ENTRY;
4746
4747                 if (sys_acl_get_tag_type(entry, &tagtype) == -1) {
4748                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4749                                 fname, strerror(errno) ));
4750                         goto done;
4751                 }
4752
4753                 if (sys_acl_get_permset(entry, &permset) == -1) {
4754                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4755                                 fname, strerror(errno) ));
4756                         goto done;
4757                 }
4758
4759                 if (tagtype == SMB_ACL_USER_OBJ) {
4760                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4761                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4762                                         fname, strerror(errno) ));
4763                         }
4764                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4765                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4766                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4767                                         fname, strerror(errno) ));
4768                         }
4769                 } else if (tagtype == SMB_ACL_OTHER) {
4770                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4771                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4772                                         fname, strerror(errno) ));
4773                         }
4774                 }
4775         }
4776
4777         /* Set the new empty file ACL. */
4778         if (fsp && fsp->fh->fd != -1) {
4779                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4780                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4781                                 fname, strerror(errno) ));
4782                         goto done;
4783                 }
4784         } else {
4785                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4786                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4787                                 fname, strerror(errno) ));
4788                         goto done;
4789                 }
4790         }
4791
4792         ret = True;
4793
4794  done:
4795
4796         if (file_acl) {
4797                 sys_acl_free_acl(file_acl);
4798         }
4799         if (new_file_acl) {
4800                 sys_acl_free_acl(new_file_acl);
4801         }
4802         return ret;
4803 }
4804
4805 /****************************************************************************
4806  Calls from UNIX extensions - POSIX ACL set.
4807  If num_def_acls == 0 then read/modify/write acl after removing all entries
4808  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4809 ****************************************************************************/
4810
4811 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4812 {
4813         SMB_ACL_T file_acl = NULL;
4814
4815         if (!num_acls) {
4816                 /* Remove the ACL from the file. */
4817                 return remove_posix_acl(conn, fsp, fname);
4818         }
4819
4820         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4821                 return False;
4822         }
4823
4824         if (fsp && fsp->fh->fd != -1) {
4825                 /* The preferred way - use an open fd. */
4826                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4827                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4828                                 fname, strerror(errno) ));
4829                         sys_acl_free_acl(file_acl);
4830                         return False;
4831                 }
4832         } else {
4833                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4834                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4835                                 fname, strerror(errno) ));
4836                         sys_acl_free_acl(file_acl);
4837                         return False;
4838                 }
4839         }
4840
4841         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4842         sys_acl_free_acl(file_acl);
4843         return True;
4844 }
4845
4846 /********************************************************************
4847  Pull the NT ACL from a file on disk or the OpenEventlog() access
4848  check.  Caller is responsible for freeing the returned security
4849  descriptor via TALLOC_FREE().  This is designed for dealing with
4850  user space access checks in smbd outside of the VFS.  For example,
4851  checking access rights in OpenEventlog().
4852
4853  Assume we are dealing with files (for now)
4854 ********************************************************************/
4855
4856 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4857 {
4858         struct security_descriptor *psd, *ret_sd;
4859         connection_struct *conn;
4860         files_struct finfo;
4861         struct fd_handle fh;
4862         NTSTATUS status;
4863
4864         conn = talloc_zero(ctx, connection_struct);
4865         if (conn == NULL) {
4866                 DEBUG(0, ("talloc failed\n"));
4867                 return NULL;
4868         }
4869
4870         if (!(conn->params = talloc(conn, struct share_params))) {
4871                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4872                 TALLOC_FREE(conn);
4873                 return NULL;
4874         }
4875
4876         conn->params->service = -1;
4877
4878         set_conn_connectpath(conn, "/");
4879
4880         if (!smbd_vfs_init(conn)) {
4881                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4882                 conn_free(conn);
4883                 return NULL;
4884         }
4885
4886         ZERO_STRUCT( finfo );
4887         ZERO_STRUCT( fh );
4888
4889         finfo.fnum = FNUM_FIELD_INVALID;
4890         finfo.conn = conn;
4891         finfo.fh = &fh;
4892         finfo.fh->fd = -1;
4893
4894         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4895                                             &finfo.fsp_name);
4896         if (!NT_STATUS_IS_OK(status)) {
4897                 conn_free(conn);
4898                 return NULL;
4899         }
4900
4901         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4902                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4903                 TALLOC_FREE(finfo.fsp_name);
4904                 conn_free(conn);
4905                 return NULL;
4906         }
4907
4908         ret_sd = dup_sec_desc( ctx, psd );
4909
4910         TALLOC_FREE(finfo.fsp_name);
4911         conn_free(conn);
4912
4913         return ret_sd;
4914 }
4915
4916 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4917
4918 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4919                                         const char *name,
4920                                         SMB_STRUCT_STAT *psbuf,
4921                                         struct security_descriptor **ppdesc)
4922 {
4923         struct dom_sid owner_sid, group_sid;
4924         size_t size = 0;
4925         struct security_ace aces[4];
4926         uint32_t access_mask = 0;
4927         mode_t mode = psbuf->st_ex_mode;
4928         struct security_acl *new_dacl = NULL;
4929         int idx = 0;
4930
4931         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4932                 name, (int)mode ));
4933
4934         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4935         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4936
4937         /*
4938          We provide up to 4 ACEs
4939                 - Owner
4940                 - Group
4941                 - Everyone
4942                 - NT System
4943         */
4944
4945         if (mode & S_IRUSR) {
4946                 if (mode & S_IWUSR) {
4947                         access_mask |= SEC_RIGHTS_FILE_ALL;
4948                 } else {
4949                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4950                 }
4951         }
4952         if (mode & S_IWUSR) {
4953                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4954         }
4955
4956         init_sec_ace(&aces[idx],
4957                         &owner_sid,
4958                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4959                         access_mask,
4960                         0);
4961         idx++;
4962
4963         access_mask = 0;
4964         if (mode & S_IRGRP) {
4965                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4966         }
4967         if (mode & S_IWGRP) {
4968                 /* note that delete is not granted - this matches posix behaviour */
4969                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4970         }
4971         if (access_mask) {
4972                 init_sec_ace(&aces[idx],
4973                         &group_sid,
4974                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4975                         access_mask,
4976                         0);
4977                 idx++;
4978         }
4979
4980         access_mask = 0;
4981         if (mode & S_IROTH) {
4982                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4983         }
4984         if (mode & S_IWOTH) {
4985                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4986         }
4987         if (access_mask) {
4988                 init_sec_ace(&aces[idx],
4989                         &global_sid_World,
4990                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4991                         access_mask,
4992                         0);
4993                 idx++;
4994         }
4995
4996         init_sec_ace(&aces[idx],
4997                         &global_sid_System,
4998                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4999                         SEC_RIGHTS_FILE_ALL,
5000                         0);
5001         idx++;
5002
5003         new_dacl = make_sec_acl(ctx,
5004                         NT4_ACL_REVISION,
5005                         idx,
5006                         aces);
5007
5008         if (!new_dacl) {
5009                 return NT_STATUS_NO_MEMORY;
5010         }
5011
5012         *ppdesc = make_sec_desc(ctx,
5013                         SECURITY_DESCRIPTOR_REVISION_1,
5014                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
5015                         &owner_sid,
5016                         &group_sid,
5017                         NULL,
5018                         new_dacl,
5019                         &size);
5020         if (!*ppdesc) {
5021                 return NT_STATUS_NO_MEMORY;
5022         }
5023         return NT_STATUS_OK;
5024 }