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(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 (sys_acl_clear_perms(*p_permset) ==  -1)
 895                 return -1;
 896         if (mode & S_IRUSR) {
 897                 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1)
 898                         return -1;
 899         }
 900         if (mode & S_IWUSR) {
 901                 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1)
 902                         return -1;
 903         }
 904         if (mode & S_IXUSR) {
 905                 if (sys_acl_add_perm(*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_mask(params->service);
1274                 or_bits = lp_force_dir_mode(params->service);
1275         } else {
1276                 and_bits = lp_create_mask(params->service);
1277                 or_bits = lp_force_create_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.
1350 ****************************************************************************/
1351
1352 static bool ensure_canon_entry_valid_on_get(connection_struct *conn,
1353                                         canon_ace **pp_ace,
1354                                         const struct dom_sid *pfile_owner_sid,
1355                                         const struct dom_sid *pfile_grp_sid,
1356                                         const SMB_STRUCT_STAT *pst)
1357 {
1358         canon_ace *pace;
1359         bool got_user = false;
1360         bool got_group = false;
1361         bool got_other = false;
1362
1363         for (pace = *pp_ace; pace; pace = pace->next) {
1364                 if (pace->type == SMB_ACL_USER_OBJ) {
1365                         got_user = true;
1366                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1367                         got_group = true;
1368                 } else if (pace->type == SMB_ACL_OTHER) {
1369                         got_other = true;
1370                 }
1371         }
1372
1373         if (!got_user) {
1374                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1375                         DEBUG(0,("malloc fail.\n"));
1376                         return false;
1377                 }
1378
1379                 ZERO_STRUCTP(pace);
1380                 pace->type = SMB_ACL_USER_OBJ;
1381                 pace->owner_type = UID_ACE;
1382                 pace->unix_ug.type = ID_TYPE_UID;
1383                 pace->unix_ug.id = pst->st_ex_uid;
1384                 pace->trustee = *pfile_owner_sid;
1385                 pace->attr = ALLOW_ACE;
1386                 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1387                 DLIST_ADD(*pp_ace, pace);
1388         }
1389
1390         if (!got_group) {
1391                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1392                         DEBUG(0,("malloc fail.\n"));
1393                         return false;
1394                 }
1395
1396                 ZERO_STRUCTP(pace);
1397                 pace->type = SMB_ACL_GROUP_OBJ;
1398                 pace->owner_type = GID_ACE;
1399                 pace->unix_ug.type = ID_TYPE_GID;
1400                 pace->unix_ug.id = pst->st_ex_gid;
1401                 pace->trustee = *pfile_grp_sid;
1402                 pace->attr = ALLOW_ACE;
1403                 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1404                 DLIST_ADD(*pp_ace, pace);
1405         }
1406
1407         if (!got_other) {
1408                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1409                         DEBUG(0,("malloc fail.\n"));
1410                         return false;
1411                 }
1412
1413                 ZERO_STRUCTP(pace);
1414                 pace->type = SMB_ACL_OTHER;
1415                 pace->owner_type = WORLD_ACE;
1416                 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1417                 pace->unix_ug.id = -1;
1418                 pace->trustee = global_sid_World;
1419                 pace->attr = ALLOW_ACE;
1420                 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1421                 DLIST_ADD(*pp_ace, pace);
1422         }
1423
1424         return true;
1425 }
1426
1427 /****************************************************************************
1428  A well formed POSIX file or default ACL has at least 3 entries, a
1429  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1430  In addition, the owner must always have at least read access.
1431  When using this call on set_acl, the pst struct has
1432  been modified to have a mode containing the default for this file or directory
1433  type.
1434 ****************************************************************************/
1435
1436 static bool ensure_canon_entry_valid_on_set(connection_struct *conn,
1437                                         canon_ace **pp_ace,
1438                                         bool is_default_acl,
1439                                         const struct share_params *params,
1440                                         const bool is_directory,
1441                                         const struct dom_sid *pfile_owner_sid,
1442                                         const struct dom_sid *pfile_grp_sid,
1443                                         const SMB_STRUCT_STAT *pst)
1444 {
1445         canon_ace *pace;
1446         canon_ace *pace_user = NULL;
1447         canon_ace *pace_group = NULL;
1448         canon_ace *pace_other = NULL;
1449         bool got_duplicate_user = false;
1450         bool got_duplicate_group = false;
1451
1452         for (pace = *pp_ace; pace; pace = pace->next) {
1453                 if (pace->type == SMB_ACL_USER_OBJ) {
1454
1455                         if (!is_default_acl) {
1456                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1457                         }
1458                         pace_user = pace;
1459
1460                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1461
1462                         /*
1463                          * Ensure create mask/force create mode is respected on set.
1464                          */
1465
1466                         if (!is_default_acl) {
1467                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1468                         }
1469                         pace_group = pace;
1470
1471                 } else if (pace->type == SMB_ACL_OTHER) {
1472
1473                         /*
1474                          * Ensure create mask/force create mode is respected on set.
1475                          */
1476
1477                         if (!is_default_acl) {
1478                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1479                         }
1480                         pace_other = pace;
1481
1482                 } else if (pace->type == SMB_ACL_USER || pace->type == SMB_ACL_GROUP) {
1483
1484                         /*
1485                          * Ensure create mask/force create mode is respected on set.
1486                          */
1487
1488                         if (!is_default_acl) {
1489                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1490                         }
1491                 }
1492         }
1493
1494         if (!pace_user) {
1495                 canon_ace *pace_iter;
1496
1497                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1498                         DEBUG(0,("talloc fail.\n"));
1499                         return false;
1500                 }
1501
1502                 ZERO_STRUCTP(pace);
1503                 pace->type = SMB_ACL_USER_OBJ;
1504                 pace->owner_type = UID_ACE;
1505                 pace->unix_ug.type = ID_TYPE_UID;
1506                 pace->unix_ug.id = pst->st_ex_uid;
1507                 pace->trustee = *pfile_owner_sid;
1508                 pace->attr = ALLOW_ACE;
1509                 /* Start with existing user permissions, principle of least
1510                    surprises for the user. */
1511                 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1512
1513                 /* See if the owning user is in any of the other groups in
1514                    the ACE, or if there's a matching user entry (by uid
1515                    or in the case of ID_TYPE_BOTH by SID).
1516                    If so, OR in the permissions from that entry. */
1517
1518
1519                 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1520                         if (pace_iter->type == SMB_ACL_USER &&
1521                                         pace_iter->unix_ug.id == pace->unix_ug.id) {
1522                                 pace->perms |= pace_iter->perms;
1523                         } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1524                                 if (dom_sid_equal(&pace->trustee, &pace_iter->trustee)) {
1525                                         pace->perms |= pace_iter->perms;
1526                                 } else if (uid_entry_in_group(conn, pace, pace_iter)) {
1527                                         pace->perms |= pace_iter->perms;
1528                                 }
1529                         }
1530                 }
1531
1532                 if (pace->perms == 0) {
1533                         /* If we only got an "everyone" perm, just use that. */
1534                         if (pace_other)
1535                                 pace->perms = pace_other->perms;
1536                 }
1537
1538                 if (!is_default_acl) {
1539                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1540                 }
1541
1542                 DLIST_ADD(*pp_ace, pace);
1543                 pace_user = pace;
1544         }
1545
1546         if (!pace_group) {
1547                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1548                         DEBUG(0,("talloc fail.\n"));
1549                         return false;
1550                 }
1551
1552                 ZERO_STRUCTP(pace);
1553                 pace->type = SMB_ACL_GROUP_OBJ;
1554                 pace->owner_type = GID_ACE;
1555                 pace->unix_ug.type = ID_TYPE_GID;
1556                 pace->unix_ug.id = pst->st_ex_gid;
1557                 pace->trustee = *pfile_grp_sid;
1558                 pace->attr = ALLOW_ACE;
1559
1560                 /* If we only got an "everyone" perm, just use that. */
1561                 if (pace_other) {
1562                         pace->perms = pace_other->perms;
1563                 } else {
1564                         pace->perms = 0;
1565                 }
1566                 if (!is_default_acl) {
1567                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1568                 }
1569
1570                 DLIST_ADD(*pp_ace, pace);
1571                 pace_group = pace;
1572         }
1573
1574         if (!pace_other) {
1575                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1576                         DEBUG(0,("talloc fail.\n"));
1577                         return false;
1578                 }
1579
1580                 ZERO_STRUCTP(pace);
1581                 pace->type = SMB_ACL_OTHER;
1582                 pace->owner_type = WORLD_ACE;
1583                 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1584                 pace->unix_ug.id = -1;
1585                 pace->trustee = global_sid_World;
1586                 pace->attr = ALLOW_ACE;
1587                 pace->perms = 0;
1588                 if (!is_default_acl) {
1589                         apply_default_perms(params, is_directory, pace, S_IROTH);
1590                 }
1591
1592                 DLIST_ADD(*pp_ace, pace);
1593                 pace_other = pace;
1594         }
1595
1596         /* Ensure when setting a POSIX ACL, that the uid for a
1597            SMB_ACL_USER_OBJ ACE (the owner ACE entry) has a duplicate
1598            permission entry as an SMB_ACL_USER, and a gid for a
1599            SMB_ACL_GROUP_OBJ ACE (the primary group ACE entry) also has
1600            a duplicate permission entry as an SMB_ACL_GROUP. If not,
1601            then if the ownership or group ownership of this file or
1602            directory gets changed, the user or group can lose their
1603            access. */
1604
1605         for (pace = *pp_ace; pace; pace = pace->next) {
1606                 if (pace->type == SMB_ACL_USER &&
1607                                 pace->unix_ug.id == pace_user->unix_ug.id) {
1608                         /* Already got one. */
1609                         got_duplicate_user = true;
1610                 } else if (pace->type == SMB_ACL_GROUP &&
1611                                 pace->unix_ug.id == pace_user->unix_ug.id) {
1612                         /* Already got one. */
1613                         got_duplicate_group = true;
1614                 } else if ((pace->type == SMB_ACL_GROUP)
1615                            && (dom_sid_equal(&pace->trustee, &pace_user->trustee))) {
1616                         /* If the SID owning the file appears
1617                          * in a group entry, then we have
1618                          * enough duplication, they will still
1619                          * have access */
1620                         got_duplicate_user = true;
1621                 }
1622         }
1623
1624         /* If the SID is equal for the user and group that we need
1625            to add the duplicate for, add only the group */
1626         if (!got_duplicate_user && !got_duplicate_group
1627                         && dom_sid_equal(&pace_group->trustee,
1628                                         &pace_user->trustee)) {
1629                 /* Add a duplicate SMB_ACL_GROUP entry, this
1630                  * will cover the owning SID as well, as it
1631                  * will always be mapped to both a uid and
1632                  * gid. */
1633
1634                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1635                         DEBUG(0,("talloc fail.\n"));
1636                         return false;
1637                 }
1638
1639                 ZERO_STRUCTP(pace);
1640                 pace->type = SMB_ACL_GROUP;;
1641                 pace->owner_type = GID_ACE;
1642                 pace->unix_ug.type = ID_TYPE_GID;
1643                 pace->unix_ug.id = pace_group->unix_ug.id;
1644                 pace->trustee = pace_group->trustee;
1645                 pace->attr = pace_group->attr;
1646                 pace->perms = pace_group->perms;
1647
1648                 DLIST_ADD(*pp_ace, pace);
1649
1650                 /* We're done here, make sure the
1651                    statements below are not executed. */
1652                 got_duplicate_user = true;
1653                 got_duplicate_group = true;
1654         }
1655
1656         if (!got_duplicate_user) {
1657                 /* Add a duplicate SMB_ACL_USER entry. */
1658                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1659                         DEBUG(0,("talloc fail.\n"));
1660                         return false;
1661                 }
1662
1663                 ZERO_STRUCTP(pace);
1664                 pace->type = SMB_ACL_USER;;
1665                 pace->owner_type = UID_ACE;
1666                 pace->unix_ug.type = ID_TYPE_UID;
1667                 pace->unix_ug.id = pace_user->unix_ug.id;
1668                 pace->trustee = pace_user->trustee;
1669                 pace->attr = pace_user->attr;
1670                 pace->perms = pace_user->perms;
1671
1672                 DLIST_ADD(*pp_ace, pace);
1673
1674                 got_duplicate_user = true;
1675         }
1676
1677         if (!got_duplicate_group) {
1678                 /* Add a duplicate SMB_ACL_GROUP entry. */
1679                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1680                         DEBUG(0,("talloc fail.\n"));
1681                         return false;
1682                 }
1683
1684                 ZERO_STRUCTP(pace);
1685                 pace->type = SMB_ACL_GROUP;;
1686                 pace->owner_type = GID_ACE;
1687                 pace->unix_ug.type = ID_TYPE_GID;
1688                 pace->unix_ug.id = pace_group->unix_ug.id;
1689                 pace->trustee = pace_group->trustee;
1690                 pace->attr = pace_group->attr;
1691                 pace->perms = pace_group->perms;
1692
1693                 DLIST_ADD(*pp_ace, pace);
1694
1695                 got_duplicate_group = true;
1696         }
1697
1698         return true;
1699 }
1700
1701 /****************************************************************************
1702  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1703  If it does not have them, check if there are any entries where the trustee is the
1704  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1705  Note we must not do this to default directory ACLs.
1706 ****************************************************************************/
1707
1708 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1709 {
1710         bool got_user_obj, got_group_obj;
1711         canon_ace *current_ace;
1712         int i, entries;
1713
1714         entries = count_canon_ace_list(ace);
1715         got_user_obj = False;
1716         got_group_obj = False;
1717
1718         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1719                 if (current_ace->type == SMB_ACL_USER_OBJ)
1720                         got_user_obj = True;
1721                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1722                         got_group_obj = True;
1723         }
1724         if (got_user_obj && got_group_obj) {
1725                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1726                 return;
1727         }
1728
1729         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1730                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1731                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1732                         current_ace->type = SMB_ACL_USER_OBJ;
1733                         got_user_obj = True;
1734                 }
1735                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1736                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1737                         current_ace->type = SMB_ACL_GROUP_OBJ;
1738                         got_group_obj = True;
1739                 }
1740         }
1741         if (!got_user_obj)
1742                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1743         if (!got_group_obj)
1744                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1745 }
1746
1747 static bool add_current_ace_to_acl(files_struct *fsp, struct security_ace *psa,
1748                                    canon_ace **file_ace, canon_ace **dir_ace,
1749                                    bool *got_file_allow, bool *got_dir_allow,
1750                                    bool *all_aces_are_inherit_only,
1751                                    canon_ace *current_ace)
1752 {
1753
1754         /*
1755          * Map the given NT permissions into a UNIX mode_t containing only
1756          * S_I(R|W|X)USR bits.
1757          */
1758
1759         current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1760         current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1761
1762         /* Store the ace_flag. */
1763         current_ace->ace_flags = psa->flags;
1764
1765         /*
1766          * Now add the created ace to either the file list, the directory
1767          * list, or both. We *MUST* preserve the order here (hence we use
1768          * DLIST_ADD_END) as NT ACLs are order dependent.
1769          */
1770
1771         if (fsp->is_directory) {
1772
1773                 /*
1774                  * We can only add to the default POSIX ACE list if the ACE is
1775                  * designed to be inherited by both files and directories.
1776                  */
1777
1778                 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1779                     (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1780
1781                         canon_ace *current_dir_ace = current_ace;
1782                         DLIST_ADD_END(*dir_ace, current_ace, canon_ace *);
1783
1784                         /*
1785                          * Note if this was an allow ace. We can't process
1786                          * any further deny ace's after this.
1787                          */
1788
1789                         if (current_ace->attr == ALLOW_ACE)
1790                                 *got_dir_allow = True;
1791
1792                         if ((current_ace->attr == DENY_ACE) && *got_dir_allow) {
1793                                 DEBUG(0,("add_current_ace_to_acl: "
1794                                          "malformed ACL in "
1795                                          "inheritable ACL! Deny entry "
1796                                          "after Allow entry. Failing "
1797                                          "to set on file %s.\n",
1798                                          fsp_str_dbg(fsp)));
1799                                 return False;
1800                         }
1801
1802                         if( DEBUGLVL( 10 )) {
1803                                 dbgtext("add_current_ace_to_acl: adding dir ACL:\n");
1804                                 print_canon_ace( current_ace, 0);
1805                         }
1806
1807                         /*
1808                          * If this is not an inherit only ACE we need to add a duplicate
1809                          * to the file acl.
1810                          */
1811
1812                         if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1813                                 canon_ace *dup_ace = dup_canon_ace(current_ace);
1814
1815                                 if (!dup_ace) {
1816                                         DEBUG(0,("add_current_ace_to_acl: malloc fail !\n"));
1817                                         return False;
1818                                 }
1819
1820                                 /*
1821                                  * We must not free current_ace here as its
1822                                  * pointer is now owned by the dir_ace list.
1823                                  */
1824                                 current_ace = dup_ace;
1825                                 /* We've essentially split this ace into two,
1826                                  * and added the ace with inheritance request
1827                                  * bits to the directory ACL. Drop those bits for
1828                                  * the ACE we're adding to the file list. */
1829                                 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1830                                                             SEC_ACE_FLAG_CONTAINER_INHERIT|
1831                                                             SEC_ACE_FLAG_INHERIT_ONLY);
1832                         } else {
1833                                 /*
1834                                  * We must not free current_ace here as its
1835                                  * pointer is now owned by the dir_ace list.
1836                                  */
1837                                 current_ace = NULL;
1838                         }
1839
1840                         /*
1841                          * current_ace is now either owned by file_ace
1842                          * or is NULL. We can safely operate on current_dir_ace
1843                          * to treat mapping for default acl entries differently
1844                          * than access acl entries.
1845                          */
1846
1847                         if (current_dir_ace->owner_type == UID_ACE) {
1848                                 /*
1849                                  * We already decided above this is a uid,
1850                                  * for default acls ace's only CREATOR_OWNER
1851                                  * maps to ACL_USER_OBJ. All other uid
1852                                  * ace's are ACL_USER.
1853                                  */
1854                                 if (dom_sid_equal(&current_dir_ace->trustee,
1855                                                   &global_sid_Creator_Owner)) {
1856                                         current_dir_ace->type = SMB_ACL_USER_OBJ;
1857                                 } else {
1858                                         current_dir_ace->type = SMB_ACL_USER;
1859                                 }
1860                         }
1861
1862                         if (current_dir_ace->owner_type == GID_ACE) {
1863                                 /*
1864                                  * We already decided above this is a gid,
1865                                  * for default acls ace's only CREATOR_GROUP
1866                                  * maps to ACL_GROUP_OBJ. All other uid
1867                                  * ace's are ACL_GROUP.
1868                                  */
1869                                 if (dom_sid_equal(&current_dir_ace->trustee,
1870                                                   &global_sid_Creator_Group)) {
1871                                         current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1872                                 } else {
1873                                         current_dir_ace->type = SMB_ACL_GROUP;
1874                                 }
1875                         }
1876                 }
1877         }
1878
1879         /*
1880          * Only add to the file ACL if not inherit only.
1881          */
1882
1883         if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1884                 DLIST_ADD_END(*file_ace, current_ace, canon_ace *);
1885
1886                 /*
1887                  * Note if this was an allow ace. We can't process
1888                  * any further deny ace's after this.
1889                  */
1890
1891                 if (current_ace->attr == ALLOW_ACE)
1892                         *got_file_allow = True;
1893
1894                 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1895                         DEBUG(0,("add_current_ace_to_acl: malformed "
1896                                  "ACL in file ACL ! Deny entry after "
1897                                  "Allow entry. Failing to set on file "
1898                                  "%s.\n", fsp_str_dbg(fsp)));
1899                         return False;
1900                 }
1901
1902                 if( DEBUGLVL( 10 )) {
1903                         dbgtext("add_current_ace_to_acl: adding file ACL:\n");
1904                         print_canon_ace( current_ace, 0);
1905                 }
1906                 *all_aces_are_inherit_only = False;
1907                 /*
1908                  * We must not free current_ace here as its
1909                  * pointer is now owned by the file_ace list.
1910                  */
1911                 current_ace = NULL;
1912         }
1913
1914         /*
1915          * Free if ACE was not added.
1916          */
1917
1918         TALLOC_FREE(current_ace);
1919         return true;
1920 }
1921
1922 /****************************************************************************
1923  Unpack a struct security_descriptor into two canonical ace lists.
1924 ****************************************************************************/
1925
1926 static bool create_canon_ace_lists(files_struct *fsp,
1927                                         const SMB_STRUCT_STAT *pst,
1928                                         struct dom_sid *pfile_owner_sid,
1929                                         struct dom_sid *pfile_grp_sid,
1930                                         canon_ace **ppfile_ace,
1931                                         canon_ace **ppdir_ace,
1932                                         const struct security_acl *dacl)
1933 {
1934         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1935         canon_ace *file_ace = NULL;
1936         canon_ace *dir_ace = NULL;
1937         canon_ace *current_ace = NULL;
1938         bool got_dir_allow = False;
1939         bool got_file_allow = False;
1940         int i, j;
1941
1942         *ppfile_ace = NULL;
1943         *ppdir_ace = NULL;
1944
1945         /*
1946          * Convert the incoming ACL into a more regular form.
1947          */
1948
1949         for(i = 0; i < dacl->num_aces; i++) {
1950                 struct security_ace *psa = &dacl->aces[i];
1951
1952                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1953                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1954                         return False;
1955                 }
1956
1957                 if (nt4_compatible_acls()) {
1958                         /*
1959                          * The security mask may be UNIX_ACCESS_NONE which should map into
1960                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1961                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1962                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1963                          */
1964
1965                         /*
1966                          * Convert GENERIC bits to specific bits.
1967                          */
1968
1969                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1970
1971                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1972
1973                         if(psa->access_mask != UNIX_ACCESS_NONE)
1974                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1975                 }
1976         }
1977
1978         /*
1979          * Deal with the fact that NT 4.x re-writes the canonical format
1980          * that we return for default ACLs. If a directory ACE is identical
1981          * to a inherited directory ACE then NT changes the bits so that the
1982          * first ACE is set to OI|IO and the second ACE for this SID is set
1983          * to CI. We need to repair this. JRA.
1984          */
1985
1986         for(i = 0; i < dacl->num_aces; i++) {
1987                 struct security_ace *psa1 = &dacl->aces[i];
1988
1989                 for (j = i + 1; j < dacl->num_aces; j++) {
1990                         struct security_ace *psa2 = &dacl->aces[j];
1991
1992                         if (psa1->access_mask != psa2->access_mask)
1993                                 continue;
1994
1995                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1996                                 continue;
1997
1998                         /*
1999                          * Ok - permission bits and SIDs are equal.
2000                          * Check if flags were re-written.
2001                          */
2002
2003                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
2004
2005                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
2006                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
2007
2008                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
2009
2010                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
2011                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
2012
2013                         }
2014                 }
2015         }
2016
2017         for(i = 0; i < dacl->num_aces; i++) {
2018                 struct security_ace *psa = &dacl->aces[i];
2019
2020                 /*
2021                  * Create a canon_ace entry representing this NT DACL ACE.
2022                  */
2023
2024                 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
2025                         free_canon_ace_list(file_ace);
2026                         free_canon_ace_list(dir_ace);
2027                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
2028                         return False;
2029                 }
2030
2031                 ZERO_STRUCTP(current_ace);
2032
2033                 sid_copy(&current_ace->trustee, &psa->trustee);
2034
2035                 /*
2036                  * Try and work out if the SID is a user or group
2037                  * as we need to flag these differently for POSIX.
2038                  * Note what kind of a POSIX ACL this should map to.
2039                  */
2040
2041                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
2042                         current_ace->owner_type = WORLD_ACE;
2043                         current_ace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
2044                         current_ace->unix_ug.id = -1;
2045                         current_ace->type = SMB_ACL_OTHER;
2046                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
2047                         current_ace->owner_type = UID_ACE;
2048                         current_ace->unix_ug.type = ID_TYPE_UID;
2049                         current_ace->unix_ug.id = pst->st_ex_uid;
2050                         current_ace->type = SMB_ACL_USER_OBJ;
2051
2052                         /*
2053                          * The Creator Owner entry only specifies inheritable permissions,
2054                          * never access permissions. WinNT doesn't always set the ACE to
2055                          * INHERIT_ONLY, though.
2056                          */
2057
2058                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
2059
2060                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
2061                         current_ace->owner_type = GID_ACE;
2062                         current_ace->unix_ug.type = ID_TYPE_GID;
2063                         current_ace->unix_ug.id = pst->st_ex_gid;
2064                         current_ace->type = SMB_ACL_GROUP_OBJ;
2065
2066                         /*
2067                          * The Creator Group entry only specifies inheritable permissions,
2068                          * never access permissions. WinNT doesn't always set the ACE to
2069                          * INHERIT_ONLY, though.
2070                          */
2071                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
2072
2073                 } else {
2074                         struct unixid unixid;
2075
2076                         if (!sids_to_unixids(&current_ace->trustee, 1, &unixid)) {
2077                                 free_canon_ace_list(file_ace);
2078                                 free_canon_ace_list(dir_ace);
2079                                 TALLOC_FREE(current_ace);
2080                                 DEBUG(0, ("create_canon_ace_lists: sids_to_unixids "
2081                                         "failed for %s (allocation failure)\n",
2082                                         sid_string_dbg(&current_ace->trustee)));
2083                                 return false;
2084                         }
2085
2086                         if (unixid.type == ID_TYPE_BOTH) {
2087                                 /* If it's the owning user, this is a
2088                                  * user_obj, not a user.  This way, we
2089                                  * get a valid ACL for groups that own
2090                                  * files, without putting user ACL
2091                                  * entries in for groups otherwise */
2092                                 if (unixid.id == pst->st_ex_uid) {
2093                                         current_ace->owner_type = UID_ACE;
2094                                         current_ace->unix_ug.type = ID_TYPE_UID;
2095                                         current_ace->unix_ug.id = unixid.id;
2096                                         current_ace->type = SMB_ACL_USER_OBJ;
2097
2098                                         /* Add the user object to the posix ACL,
2099                                            and proceed to the group mapping
2100                                            below. This handles the talloc_free
2101                                            of current_ace if not added for some
2102                                            reason */
2103                                         if (!add_current_ace_to_acl(fsp,
2104                                                         psa,
2105                                                         &file_ace,
2106                                                         &dir_ace,
2107                                                         &got_file_allow,
2108                                                         &got_dir_allow,
2109                                                         &all_aces_are_inherit_only,
2110                                                         current_ace)) {
2111                                                 free_canon_ace_list(file_ace);
2112                                                 free_canon_ace_list(dir_ace);
2113                                                 return false;
2114                                         }
2115
2116                                         if ((current_ace = talloc(talloc_tos(),
2117                                                         canon_ace)) == NULL) {
2118                                                 free_canon_ace_list(file_ace);
2119                                                 free_canon_ace_list(dir_ace);
2120                                                 DEBUG(0,("create_canon_ace_lists: "
2121                                                         "malloc fail.\n"));
2122                                                 return False;
2123                                         }
2124
2125                                         ZERO_STRUCTP(current_ace);
2126                                 }
2127
2128                                 sid_copy(&current_ace->trustee, &psa->trustee);
2129
2130                                 current_ace->unix_ug.type = ID_TYPE_GID;
2131                                 current_ace->unix_ug.id = unixid.id;
2132                                 current_ace->owner_type = GID_ACE;
2133                                 /* If it's the primary group, this is a
2134                                    group_obj, not a group. */
2135                                 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2136                                         current_ace->type = SMB_ACL_GROUP_OBJ;
2137                                 } else {
2138                                         current_ace->type = SMB_ACL_GROUP;
2139                                 }
2140
2141                         } else if (unixid.type == ID_TYPE_UID) {
2142                                 current_ace->owner_type = UID_ACE;
2143                                 current_ace->unix_ug.type = ID_TYPE_UID;
2144                                 current_ace->unix_ug.id = unixid.id;
2145                                 /* If it's the owning user, this is a user_obj,
2146                                    not a user. */
2147                                 if (current_ace->unix_ug.id == pst->st_ex_uid) {
2148                                         current_ace->type = SMB_ACL_USER_OBJ;
2149                                 } else {
2150                                         current_ace->type = SMB_ACL_USER;
2151                                 }
2152                         } else if (unixid.type == ID_TYPE_GID) {
2153                                 current_ace->unix_ug.type = ID_TYPE_GID;
2154                                 current_ace->unix_ug.id = unixid.id;
2155                                 current_ace->owner_type = GID_ACE;
2156                                 /* If it's the primary group, this is a
2157                                    group_obj, not a group. */
2158                                 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2159                                         current_ace->type = SMB_ACL_GROUP_OBJ;
2160                                 } else {
2161                                         current_ace->type = SMB_ACL_GROUP;
2162                                 }
2163                         } else {
2164                                 /*
2165                                  * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
2166                                  */
2167
2168                                 if (non_mappable_sid(&psa->trustee)) {
2169                                         DEBUG(10, ("create_canon_ace_lists: ignoring "
2170                                                    "non-mappable SID %s\n",
2171                                                    sid_string_dbg(&psa->trustee)));
2172                                         TALLOC_FREE(current_ace);
2173                                         continue;
2174                                 }
2175
2176                                 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
2177                                         DEBUG(10, ("create_canon_ace_lists: ignoring "
2178                                                 "unknown or foreign SID %s\n",
2179                                                 sid_string_dbg(&psa->trustee)));
2180                                         TALLOC_FREE(current_ace);
2181                                         continue;
2182                                 }
2183
2184                                 free_canon_ace_list(file_ace);
2185                                 free_canon_ace_list(dir_ace);
2186                                 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
2187                                           "%s to uid or gid.\n",
2188                                           sid_string_dbg(&current_ace->trustee)));
2189                                 TALLOC_FREE(current_ace);
2190                                 return false;
2191                         }
2192                 }
2193
2194                 /* handles the talloc_free of current_ace if not added for some reason */
2195                 if (!add_current_ace_to_acl(fsp, psa, &file_ace, &dir_ace,
2196                                             &got_file_allow, &got_dir_allow,
2197                                             &all_aces_are_inherit_only, current_ace)) {
2198                         free_canon_ace_list(file_ace);
2199                         free_canon_ace_list(dir_ace);
2200                         return false;
2201                 }
2202         }
2203
2204         if (fsp->is_directory && all_aces_are_inherit_only) {
2205                 /*
2206                  * Windows 2000 is doing one of these weird 'inherit acl'
2207                  * traverses to conserve NTFS ACL resources. Just pretend
2208                  * there was no DACL sent. JRA.
2209                  */
2210
2211                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
2212                 free_canon_ace_list(file_ace);
2213                 free_canon_ace_list(dir_ace);
2214                 file_ace = NULL;
2215                 dir_ace = NULL;
2216         } else {
2217                 /*
2218                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
2219                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
2220                  * entries can be converted to *_OBJ. Don't do this for the default
2221                  * ACL, we will create them separately for this if needed inside
2222                  * ensure_canon_entry_valid_on_set().
2223                  */
2224                 if (file_ace) {
2225                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
2226                 }
2227         }
2228
2229         *ppfile_ace = file_ace;
2230         *ppdir_ace = dir_ace;
2231
2232         return True;
2233 }
2234
2235 /****************************************************************************
2236  ASCII art time again... JRA :-).
2237
2238  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2239  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2240  entries). Secondly, the merge code has ensured that all duplicate SID entries for
2241  allow or deny have been merged, so the same SID can only appear once in the deny
2242  list or once in the allow list.
2243
2244  We then process as follows :
2245
2246  ---------------------------------------------------------------------------
2247  First pass - look for a Everyone DENY entry.
2248
2249  If it is deny all (rwx) trunate the list at this point.
2250  Else, walk the list from this point and use the deny permissions of this
2251  entry as a mask on all following allow entries. Finally, delete
2252  the Everyone DENY entry (we have applied it to everything possible).
2253
2254  In addition, in this pass we remove any DENY entries that have
2255  no permissions (ie. they are a DENY nothing).
2256  ---------------------------------------------------------------------------
2257  Second pass - only deal with deny user entries.
2258
2259  DENY user1 (perms XXX)
2260
2261  new_perms = 0
2262  for all following allow group entries where user1 is in group
2263         new_perms |= group_perms;
2264
2265  user1 entry perms = new_perms & ~ XXX;
2266
2267  Convert the deny entry to an allow entry with the new perms and
2268  push to the end of the list. Note if the user was in no groups
2269  this maps to a specific allow nothing entry for this user.
2270
2271  The common case from the NT ACL choser (userX deny all) is
2272  optimised so we don't do the group lookup - we just map to
2273  an allow nothing entry.
2274
2275  What we're doing here is inferring the allow permissions the
2276  person setting the ACE on user1 wanted by looking at the allow
2277  permissions on the groups the user is currently in. This will
2278  be a snapshot, depending on group membership but is the best
2279  we can do and has the advantage of failing closed rather than
2280  open.
2281  ---------------------------------------------------------------------------
2282  Third pass - only deal with deny group entries.
2283
2284  DENY group1 (perms XXX)
2285
2286  for all following allow user entries where user is in group1
2287    user entry perms = user entry perms & ~ XXX;
2288
2289  If there is a group Everyone allow entry with permissions YYY,
2290  convert the group1 entry to an allow entry and modify its
2291  permissions to be :
2292
2293  new_perms = YYY & ~ XXX
2294
2295  and push to the end of the list.
2296
2297  If there is no group Everyone allow entry then convert the
2298  group1 entry to a allow nothing entry and push to the end of the list.
2299
2300  Note that the common case from the NT ACL choser (groupX deny all)
2301  cannot be optimised here as we need to modify user entries who are
2302  in the group to change them to a deny all also.
2303
2304  What we're doing here is modifying the allow permissions of
2305  user entries (which are more specific in POSIX ACLs) to mask
2306  out the explicit deny set on the group they are in. This will
2307  be a snapshot depending on current group membership but is the
2308  best we can do and has the advantage of failing closed rather
2309  than open.
2310  ---------------------------------------------------------------------------
2311  Fourth pass - cope with cumulative permissions.
2312
2313  for all allow user entries, if there exists an allow group entry with
2314  more permissive permissions, and the user is in that group, rewrite the
2315  allow user permissions to contain both sets of permissions.
2316
2317  Currently the code for this is #ifdef'ed out as these semantics make
2318  no sense to me. JRA.
2319  ---------------------------------------------------------------------------
2320
2321  Note we *MUST* do the deny user pass first as this will convert deny user
2322  entries into allow user entries which can then be processed by the deny
2323  group pass.
2324
2325  The above algorithm took a *lot* of thinking about - hence this
2326  explaination :-). JRA.
2327 ****************************************************************************/
2328
2329 /****************************************************************************
2330  Process a canon_ace list entries. This is very complex code. We need
2331  to go through and remove the "deny" permissions from any allow entry that matches
2332  the id of this entry. We have already refused any NT ACL that wasn't in correct
2333  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2334  we just remove it (to fail safe). We have already removed any duplicate ace
2335  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2336  allow entries.
2337 ****************************************************************************/
2338
2339 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2340 {
2341         canon_ace *ace_list = *pp_ace_list;
2342         canon_ace *curr_ace = NULL;
2343         canon_ace *curr_ace_next = NULL;
2344
2345         /* Pass 1 above - look for an Everyone, deny entry. */
2346
2347         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2348                 canon_ace *allow_ace_p;
2349
2350                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2351
2352                 if (curr_ace->attr != DENY_ACE)
2353                         continue;
2354
2355                 if (curr_ace->perms == (mode_t)0) {
2356
2357                         /* Deny nothing entry - delete. */
2358
2359                         DLIST_REMOVE(ace_list, curr_ace);
2360                         continue;
2361                 }
2362
2363                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2364                         continue;
2365
2366                 /* JRATEST - assert. */
2367                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2368
2369                 if (curr_ace->perms == ALL_ACE_PERMS) {
2370
2371                         /*
2372                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2373                          * list at this point including this entry.
2374                          */
2375
2376                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2377
2378                         free_canon_ace_list( curr_ace );
2379                         if (prev_entry)
2380                                 DLIST_REMOVE(ace_list, prev_entry);
2381                         else {
2382                                 /* We deleted the entire list. */
2383                                 ace_list = NULL;
2384                         }
2385                         break;
2386                 }
2387
2388                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2389
2390                         /*
2391                          * Only mask off allow entries.
2392                          */
2393
2394                         if (allow_ace_p->attr != ALLOW_ACE)
2395                                 continue;
2396
2397                         allow_ace_p->perms &= ~curr_ace->perms;
2398                 }
2399
2400                 /*
2401                  * Now it's been applied, remove it.
2402                  */
2403
2404                 DLIST_REMOVE(ace_list, curr_ace);
2405         }
2406
2407         /* Pass 2 above - deal with deny user entries. */
2408
2409         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2410                 mode_t new_perms = (mode_t)0;
2411                 canon_ace *allow_ace_p;
2412
2413                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2414
2415                 if (curr_ace->attr != DENY_ACE)
2416                         continue;
2417
2418                 if (curr_ace->owner_type != UID_ACE)
2419                         continue;
2420
2421                 if (curr_ace->perms == ALL_ACE_PERMS) {
2422
2423                         /*
2424                          * Optimisation - this is a deny everything to this user.
2425                          * Convert to an allow nothing and push to the end of the list.
2426                          */
2427
2428                         curr_ace->attr = ALLOW_ACE;
2429                         curr_ace->perms = (mode_t)0;
2430                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2431                         continue;
2432                 }
2433
2434                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2435
2436                         if (allow_ace_p->attr != ALLOW_ACE)
2437                                 continue;
2438
2439                         /* We process GID_ACE and WORLD_ACE entries only. */
2440
2441                         if (allow_ace_p->owner_type == UID_ACE)
2442                                 continue;
2443
2444                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2445                                 new_perms |= allow_ace_p->perms;
2446                 }
2447
2448                 /*
2449                  * Convert to a allow entry, modify the perms and push to the end
2450                  * of the list.
2451                  */
2452
2453                 curr_ace->attr = ALLOW_ACE;
2454                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2455                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2456         }
2457
2458         /* Pass 3 above - deal with deny group entries. */
2459
2460         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2461                 canon_ace *allow_ace_p;
2462                 canon_ace *allow_everyone_p = NULL;
2463
2464                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2465
2466                 if (curr_ace->attr != DENY_ACE)
2467                         continue;
2468
2469                 if (curr_ace->owner_type != GID_ACE)
2470                         continue;
2471
2472                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2473
2474                         if (allow_ace_p->attr != ALLOW_ACE)
2475                                 continue;
2476
2477                         /* Store a pointer to the Everyone allow, if it exists. */
2478                         if (allow_ace_p->owner_type == WORLD_ACE)
2479                                 allow_everyone_p = allow_ace_p;
2480
2481                         /* We process UID_ACE entries only. */
2482
2483                         if (allow_ace_p->owner_type != UID_ACE)
2484                                 continue;
2485
2486                         /* Mask off the deny group perms. */
2487
2488                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2489                                 allow_ace_p->perms &= ~curr_ace->perms;
2490                 }
2491
2492                 /*
2493                  * Convert the deny to an allow with the correct perms and
2494                  * push to the end of the list.
2495                  */
2496
2497                 curr_ace->attr = ALLOW_ACE;
2498                 if (allow_everyone_p)
2499                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2500                 else
2501                         curr_ace->perms = (mode_t)0;
2502                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2503         }
2504
2505         /* Doing this fourth pass allows Windows semantics to be layered
2506          * on top of POSIX semantics. I'm not sure if this is desirable.
2507          * For example, in W2K ACLs there is no way to say, "Group X no
2508          * access, user Y full access" if user Y is a member of group X.
2509          * This seems completely broken semantics to me.... JRA.
2510          */
2511
2512 #if 0
2513         /* Pass 4 above - deal with allow entries. */
2514
2515         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2516                 canon_ace *allow_ace_p;
2517
2518                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2519
2520                 if (curr_ace->attr != ALLOW_ACE)
2521                         continue;
2522
2523                 if (curr_ace->owner_type != UID_ACE)
2524                         continue;
2525
2526                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2527
2528                         if (allow_ace_p->attr != ALLOW_ACE)
2529                                 continue;
2530
2531                         /* We process GID_ACE entries only. */
2532
2533                         if (allow_ace_p->owner_type != GID_ACE)
2534                                 continue;
2535
2536                         /* OR in the group perms. */
2537
2538                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2539                                 curr_ace->perms |= allow_ace_p->perms;
2540                 }
2541         }
2542 #endif
2543
2544         *pp_ace_list = ace_list;
2545 }
2546
2547 /****************************************************************************
2548  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2549  succeeding.
2550 ****************************************************************************/
2551
2552 static bool unpack_canon_ace(files_struct *fsp,
2553                                 const SMB_STRUCT_STAT *pst,
2554                                 struct dom_sid *pfile_owner_sid,
2555                                 struct dom_sid *pfile_grp_sid,
2556                                 canon_ace **ppfile_ace,
2557                                 canon_ace **ppdir_ace,
2558                                 uint32 security_info_sent,
2559                                 const struct security_descriptor *psd)
2560 {
2561         canon_ace *file_ace = NULL;
2562         canon_ace *dir_ace = NULL;
2563
2564         *ppfile_ace = NULL;
2565         *ppdir_ace = NULL;
2566
2567         if(security_info_sent == 0) {
2568                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2569                 return False;
2570         }
2571
2572         /*
2573          * If no DACL then this is a chown only security descriptor.
2574          */
2575
2576         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2577                 return True;
2578
2579         /*
2580          * Now go through the DACL and create the canon_ace lists.
2581          */
2582
2583         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2584                                                                 &file_ace, &dir_ace, psd->dacl))
2585                 return False;
2586
2587         if ((file_ace == NULL) && (dir_ace == NULL)) {
2588                 /* W2K traverse DACL set - ignore. */
2589                 return True;
2590         }
2591
2592         /*
2593          * Go through the canon_ace list and merge entries
2594          * belonging to identical users of identical allow or deny type.
2595          * We can do this as all deny entries come first, followed by
2596          * all allow entries (we have mandated this before accepting this acl).
2597          */
2598
2599         print_canon_ace_list( "file ace - before merge", file_ace);
2600         merge_aces( &file_ace, false);
2601
2602         print_canon_ace_list( "dir ace - before merge", dir_ace);
2603         merge_aces( &dir_ace, true);
2604
2605         /*
2606          * NT ACLs are order dependent. Go through the acl lists and
2607          * process DENY entries by masking the allow entries.
2608          */
2609
2610         print_canon_ace_list( "file ace - before deny", file_ace);
2611         process_deny_list(fsp->conn, &file_ace);
2612
2613         print_canon_ace_list( "dir ace - before deny", dir_ace);
2614         process_deny_list(fsp->conn, &dir_ace);
2615
2616         /*
2617          * A well formed POSIX file or default ACL has at least 3 entries, a
2618          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2619          * and optionally a mask entry. Ensure this is the case.
2620          */
2621
2622         print_canon_ace_list( "file ace - before valid", file_ace);
2623
2624         if (!ensure_canon_entry_valid_on_set(fsp->conn, &file_ace, false, fsp->conn->params,
2625                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2626                 free_canon_ace_list(file_ace);
2627                 free_canon_ace_list(dir_ace);
2628                 return False;
2629         }
2630
2631         print_canon_ace_list( "dir ace - before valid", dir_ace);
2632
2633         if (dir_ace && !ensure_canon_entry_valid_on_set(fsp->conn, &dir_ace, true, fsp->conn->params,
2634                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2635                 free_canon_ace_list(file_ace);
2636                 free_canon_ace_list(dir_ace);
2637                 return False;
2638         }
2639
2640         print_canon_ace_list( "file ace - return", file_ace);
2641         print_canon_ace_list( "dir ace - return", dir_ace);
2642
2643         *ppfile_ace = file_ace;
2644         *ppdir_ace = dir_ace;
2645         return True;
2646
2647 }
2648
2649 /******************************************************************************
2650  When returning permissions, try and fit NT display
2651  semantics if possible. Note the the canon_entries here must have been malloced.
2652  The list format should be - first entry = owner, followed by group and other user
2653  entries, last entry = other.
2654
2655  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2656  are not ordered, and match on the most specific entry rather than walking a list,
2657  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2658
2659  Entry 0: owner : deny all except read and write.
2660  Entry 1: owner : allow read and write.
2661  Entry 2: group : deny all except read.
2662  Entry 3: group : allow read.
2663  Entry 4: Everyone : allow read.
2664
2665  But NT cannot display this in their ACL editor !
2666 ********************************************************************************/
2667
2668 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2669 {
2670         canon_ace *l_head = *pp_list_head;
2671         canon_ace *owner_ace = NULL;
2672         canon_ace *other_ace = NULL;
2673         canon_ace *ace = NULL;
2674
2675         for (ace = l_head; ace; ace = ace->next) {
2676                 if (ace->type == SMB_ACL_USER_OBJ)
2677                         owner_ace = ace;
2678                 else if (ace->type == SMB_ACL_OTHER) {
2679                         /* Last ace - this is "other" */
2680                         other_ace = ace;
2681                 }
2682         }
2683
2684         if (!owner_ace || !other_ace) {
2685                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2686                         filename ));
2687                 return;
2688         }
2689
2690         /*
2691          * The POSIX algorithm applies to owner first, and other last,
2692          * so ensure they are arranged in this order.
2693          */
2694
2695         if (owner_ace) {
2696                 DLIST_PROMOTE(l_head, owner_ace);
2697         }
2698
2699         if (other_ace) {
2700                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2701         }
2702
2703         /* We have probably changed the head of the list. */
2704
2705         *pp_list_head = l_head;
2706 }
2707
2708 /****************************************************************************
2709  Create a linked list of canonical ACE entries.
2710 ****************************************************************************/
2711
2712 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2713                                    const char *fname, SMB_ACL_T posix_acl,
2714                                    const SMB_STRUCT_STAT *psbuf,
2715                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2716 {
2717         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2718         canon_ace *l_head = NULL;
2719         canon_ace *ace = NULL;
2720         canon_ace *next_ace = NULL;
2721         int entry_id = SMB_ACL_FIRST_ENTRY;
2722         bool is_default_acl = (the_acl_type == SMB_ACL_TYPE_DEFAULT);
2723         SMB_ACL_ENTRY_T entry;
2724         size_t ace_count;
2725
2726         while ( posix_acl && (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1)) {
2727                 SMB_ACL_TAG_T tagtype;
2728                 SMB_ACL_PERMSET_T permset;
2729                 struct dom_sid sid;
2730                 struct unixid unix_ug;
2731                 enum ace_owner owner_type;
2732
2733                 entry_id = SMB_ACL_NEXT_ENTRY;
2734
2735                 /* Is this a MASK entry ? */
2736                 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
2737                         continue;
2738
2739                 if (sys_acl_get_permset(entry, &permset) == -1)
2740                         continue;
2741
2742                 /* Decide which SID to use based on the ACL type. */
2743                 switch(tagtype) {
2744                         case SMB_ACL_USER_OBJ:
2745                                 /* Get the SID from the owner. */
2746                                 sid_copy(&sid, powner);
2747                                 unix_ug.type = ID_TYPE_UID;
2748                                 unix_ug.id = psbuf->st_ex_uid;
2749                                 owner_type = UID_ACE;
2750                                 break;
2751                         case SMB_ACL_USER:
2752                                 {
2753                                         uid_t *puid = (uid_t *)sys_acl_get_qualifier(entry);
2754                                         if (puid == NULL) {
2755                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2756                                                 continue;
2757                                         }
2758                                         uid_to_sid( &sid, *puid);
2759                                         unix_ug.type = ID_TYPE_UID;
2760                                         unix_ug.id = *puid;
2761                                         owner_type = UID_ACE;
2762                                         break;
2763                                 }
2764                         case SMB_ACL_GROUP_OBJ:
2765                                 /* Get the SID from the owning group. */
2766                                 sid_copy(&sid, pgroup);
2767                                 unix_ug.type = ID_TYPE_GID;
2768                                 unix_ug.id = psbuf->st_ex_gid;
2769                                 owner_type = GID_ACE;
2770                                 break;
2771                         case SMB_ACL_GROUP:
2772                                 {
2773                                         gid_t *pgid = (gid_t *)sys_acl_get_qualifier(entry);
2774                                         if (pgid == NULL) {
2775                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2776                                                 continue;
2777                                         }
2778                                         gid_to_sid( &sid, *pgid);
2779                                         unix_ug.type = ID_TYPE_GID;
2780                                         unix_ug.id = *pgid;
2781                                         owner_type = GID_ACE;
2782                                         break;
2783                                 }
2784                         case SMB_ACL_MASK:
2785                                 acl_mask = convert_permset_to_mode_t(permset);
2786                                 continue; /* Don't count the mask as an entry. */
2787                         case SMB_ACL_OTHER:
2788                                 /* Use the Everyone SID */
2789                                 sid = global_sid_World;
2790                                 unix_ug.type = ID_TYPE_NOT_SPECIFIED;
2791                                 unix_ug.id = -1;
2792                                 owner_type = WORLD_ACE;
2793                                 break;
2794                         default:
2795                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2796                                 continue;
2797                 }
2798
2799                 /*
2800                  * Add this entry to the list.
2801                  */
2802
2803                 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2804                         goto fail;
2805
2806                 ZERO_STRUCTP(ace);
2807                 ace->type = tagtype;
2808                 ace->perms = convert_permset_to_mode_t(permset);
2809                 ace->attr = ALLOW_ACE;
2810                 ace->trustee = sid;
2811                 ace->unix_ug = unix_ug;
2812                 ace->owner_type = owner_type;
2813                 ace->ace_flags = get_pai_flags(pal, ace, is_default_acl);
2814
2815                 DLIST_ADD(l_head, ace);
2816         }
2817
2818         /*
2819          * This next call will ensure we have at least a user/group/world set.
2820          */
2821
2822         if (!ensure_canon_entry_valid_on_get(conn, &l_head,
2823                                       powner, pgroup,
2824                                       psbuf))
2825                 goto fail;
2826
2827         /*
2828          * Now go through the list, masking the permissions with the
2829          * acl_mask. Ensure all DENY Entries are at the start of the list.
2830          */
2831
2832         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", is_default_acl ?  "Default" : "Access"));
2833
2834         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2835                 next_ace = ace->next;
2836
2837                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2838                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2839                         ace->perms &= acl_mask;
2840
2841                 if (ace->perms == 0) {
2842                         DLIST_PROMOTE(l_head, ace);
2843                 }
2844
2845                 if( DEBUGLVL( 10 ) ) {
2846                         print_canon_ace(ace, ace_count);
2847                 }
2848         }
2849
2850         arrange_posix_perms(fname,&l_head );
2851
2852         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2853
2854         return l_head;
2855
2856   fail:
2857
2858         free_canon_ace_list(l_head);
2859         return NULL;
2860 }
2861
2862 /****************************************************************************
2863  Check if the current user group list contains a given group.
2864 ****************************************************************************/
2865
2866 bool current_user_in_group(connection_struct *conn, gid_t gid)
2867 {
2868         int i;
2869         const struct security_unix_token *utok = get_current_utok(conn);
2870
2871         for (i = 0; i < utok->ngroups; i++) {
2872                 if (utok->groups[i] == gid) {
2873                         return True;
2874                 }
2875         }
2876
2877         return False;
2878 }
2879
2880 /****************************************************************************
2881  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2882 ****************************************************************************/
2883
2884 static bool acl_group_override(connection_struct *conn,
2885                                const struct smb_filename *smb_fname)
2886 {
2887         if ((errno != EPERM) && (errno != EACCES)) {
2888                 return false;
2889         }
2890
2891         /* file primary group == user primary or supplementary group */
2892         if (lp_acl_group_control(SNUM(conn)) &&
2893             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2894                 return true;
2895         }
2896
2897         /* user has writeable permission */
2898         if (lp_dos_filemode(SNUM(conn)) &&
2899             can_write_to_file(conn, smb_fname)) {
2900                 return true;
2901         }
2902
2903         return false;
2904 }
2905
2906 /****************************************************************************
2907  Attempt to apply an ACL to a file or directory.
2908 ****************************************************************************/
2909
2910 static bool set_canon_ace_list(files_struct *fsp,
2911                                 canon_ace *the_ace,
2912                                 bool default_ace,
2913                                 const SMB_STRUCT_STAT *psbuf,
2914                                 bool *pacl_set_support)
2915 {
2916         connection_struct *conn = fsp->conn;
2917         bool ret = False;
2918         SMB_ACL_T the_acl = sys_acl_init(talloc_tos());
2919         canon_ace *p_ace;
2920         int i;
2921         SMB_ACL_ENTRY_T mask_entry;
2922         bool got_mask_entry = False;
2923         SMB_ACL_PERMSET_T mask_permset;
2924         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2925         bool needs_mask = False;
2926         mode_t mask_perms = 0;
2927
2928         /* Use the psbuf that was passed in. */
2929         if (psbuf != &fsp->fsp_name->st) {
2930                 fsp->fsp_name->st = *psbuf;
2931         }
2932
2933 #if defined(POSIX_ACL_NEEDS_MASK)
2934         /* HP-UX always wants to have a mask (called "class" there). */
2935         needs_mask = True;
2936 #endif
2937
2938         if (the_acl == NULL) {
2939                 DEBUG(0, ("sys_acl_init failed to allocate an ACL\n"));
2940                 return false;
2941         }
2942
2943         if( DEBUGLVL( 10 )) {
2944                 dbgtext("set_canon_ace_list: setting ACL:\n");
2945                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2946                         print_canon_ace( p_ace, i);
2947                 }
2948         }
2949
2950         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2951                 SMB_ACL_ENTRY_T the_entry;
2952                 SMB_ACL_PERMSET_T the_permset;
2953
2954                 /*
2955                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2956                  * named group entries. But if there is an ACL_MASK entry, it applies
2957                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2958                  * so that it doesn't deny (i.e., mask off) any permissions.
2959                  */
2960
2961                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2962                         needs_mask = True;
2963                         mask_perms |= p_ace->perms;
2964                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2965                         mask_perms |= p_ace->perms;
2966                 }
2967
2968                 /*
2969                  * Get the entry for this ACE.
2970                  */
2971
2972                 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
2973                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2974                                 i, strerror(errno) ));
2975                         goto fail;
2976                 }
2977
2978                 if (p_ace->type == SMB_ACL_MASK) {
2979                         mask_entry = the_entry;
2980                         got_mask_entry = True;
2981                 }
2982
2983                 /*
2984                  * Ok - we now know the ACL calls should be working, don't
2985                  * allow fallback to chmod.
2986                  */
2987
2988                 *pacl_set_support = True;
2989
2990                 /*
2991                  * Initialise the entry from the canon_ace.
2992                  */
2993
2994                 /*
2995                  * First tell the entry what type of ACE this is.
2996                  */
2997
2998                 if (sys_acl_set_tag_type(the_entry, p_ace->type) == -1) {
2999                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
3000                                 i, strerror(errno) ));
3001                         goto fail;
3002                 }
3003
3004                 /*
3005                  * Only set the qualifier (user or group id) if the entry is a user
3006                  * or group id ACE.
3007                  */
3008
3009                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
3010                         if (sys_acl_set_qualifier(the_entry,(void *)&p_ace->unix_ug.id) == -1) {
3011                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
3012                                         i, strerror(errno) ));
3013                                 goto fail;
3014                         }
3015                 }
3016
3017                 /*
3018                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
3019                  */
3020
3021                 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
3022                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
3023                                 i, strerror(errno) ));
3024                         goto fail;
3025                 }
3026
3027                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
3028                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
3029                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
3030                         goto fail;
3031                 }
3032
3033                 /*
3034                  * ..and apply them to the entry.
3035                  */
3036
3037                 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
3038                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
3039                                 i, strerror(errno) ));
3040                         goto fail;
3041                 }
3042
3043                 if( DEBUGLVL( 10 ))
3044                         print_canon_ace( p_ace, i);
3045
3046         }
3047
3048         if (needs_mask && !got_mask_entry) {
3049                 if (sys_acl_create_entry(&the_acl, &mask_entry) == -1) {
3050                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
3051                         goto fail;
3052                 }
3053
3054                 if (sys_acl_set_tag_type(mask_entry, SMB_ACL_MASK) == -1) {
3055                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
3056                         goto fail;
3057                 }
3058
3059                 if (sys_acl_get_permset(mask_entry, &mask_permset) == -1) {
3060                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
3061                         goto fail;
3062                 }
3063
3064                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
3065                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
3066                         goto fail;
3067                 }
3068
3069                 if (sys_acl_set_permset(mask_entry, mask_permset) == -1) {
3070                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
3071                         goto fail;
3072                 }
3073         }
3074
3075         /*
3076          * Finally apply it to the file or directory.
3077          */
3078
3079         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
3080                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
3081                                              the_acl_type, the_acl) == -1) {
3082                         /*
3083                          * Some systems allow all the above calls and only fail with no ACL support
3084                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3085                          */
3086                         if (no_acl_syscall_error(errno)) {
3087                                 *pacl_set_support = False;
3088                         }
3089
3090                         if (acl_group_override(conn, fsp->fsp_name)) {
3091                                 int sret;
3092
3093                                 DEBUG(5,("set_canon_ace_list: acl group "
3094                                          "control on and current user in file "
3095                                          "%s primary group.\n",
3096                                          fsp_str_dbg(fsp)));
3097
3098                                 become_root();
3099                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
3100                                     fsp->fsp_name->base_name, the_acl_type,
3101                                     the_acl);
3102                                 unbecome_root();
3103                                 if (sret == 0) {
3104                                         ret = True;
3105                                 }
3106                         }
3107
3108                         if (ret == False) {
3109                                 DEBUG(2,("set_canon_ace_list: "
3110                                          "sys_acl_set_file type %s failed for "
3111                                          "file %s (%s).\n",
3112                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
3113                                          "directory default" : "file",
3114                                          fsp_str_dbg(fsp), strerror(errno)));
3115                                 goto fail;
3116                         }
3117                 }
3118         } else {
3119                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
3120                         /*
3121                          * Some systems allow all the above calls and only fail with no ACL support
3122                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3123                          */
3124                         if (no_acl_syscall_error(errno)) {
3125                                 *pacl_set_support = False;
3126                         }
3127
3128                         if (acl_group_override(conn, fsp->fsp_name)) {
3129                                 int sret;
3130
3131                                 DEBUG(5,("set_canon_ace_list: acl group "
3132                                          "control on and current user in file "
3133                                          "%s primary group.\n",
3134                                          fsp_str_dbg(fsp)));
3135
3136                                 become_root();
3137                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
3138                                 unbecome_root();
3139                                 if (sret == 0) {
3140                                         ret = True;
3141                                 }
3142                         }
3143
3144                         if (ret == False) {
3145                                 DEBUG(2,("set_canon_ace_list: "
3146                                          "sys_acl_set_file failed for file %s "
3147                                          "(%s).\n",
3148                                          fsp_str_dbg(fsp), strerror(errno)));
3149                                 goto fail;
3150                         }
3151                 }
3152         }
3153
3154         ret = True;
3155
3156   fail:
3157
3158         if (the_acl != NULL) {
3159                 TALLOC_FREE(the_acl);
3160         }
3161
3162         return ret;
3163 }
3164
3165 /****************************************************************************
3166  Find a particular canon_ace entry.
3167 ****************************************************************************/
3168
3169 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, struct unixid *id)
3170 {
3171         while (list) {
3172                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
3173                                 (type == SMB_ACL_USER  && id && id->id == list->unix_ug.id) ||
3174                                 (type == SMB_ACL_GROUP && id && id->id == list->unix_ug.id)))
3175                         break;
3176                 list = list->next;
3177         }
3178         return list;
3179 }
3180
3181 /****************************************************************************
3182
3183 ****************************************************************************/
3184
3185 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
3186 {
3187         SMB_ACL_ENTRY_T entry;
3188
3189         if (!the_acl)
3190                 return NULL;
3191         if (sys_acl_get_entry(the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
3192                 TALLOC_FREE(the_acl);
3193                 return NULL;
3194         }
3195         return the_acl;
3196 }
3197
3198 /****************************************************************************
3199  Convert a canon_ace to a generic 3 element permission - if possible.
3200 ****************************************************************************/
3201
3202 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3203
3204 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3205 {
3206         int snum = SNUM(fsp->conn);
3207         size_t ace_count = count_canon_ace_list(file_ace_list);
3208         canon_ace *ace_p;
3209         canon_ace *owner_ace = NULL;
3210         canon_ace *group_ace = NULL;
3211         canon_ace *other_ace = NULL;
3212         mode_t and_bits;
3213         mode_t or_bits;
3214
3215         if (ace_count != 3) {
3216                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3217                          "entries for file %s to convert to posix perms.\n",
3218                          fsp_str_dbg(fsp)));
3219                 return False;
3220         }
3221
3222         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3223                 if (ace_p->owner_type == UID_ACE)
3224                         owner_ace = ace_p;
3225                 else if (ace_p->owner_type == GID_ACE)
3226                         group_ace = ace_p;
3227                 else if (ace_p->owner_type == WORLD_ACE)
3228                         other_ace = ace_p;
3229         }
3230
3231         if (!owner_ace || !group_ace || !other_ace) {
3232                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3233                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3234                 return False;
3235         }
3236
3237         *posix_perms = (mode_t)0;
3238
3239         *posix_perms |= owner_ace->perms;
3240         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3241         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3242         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3243         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3244         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3245         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3246
3247         /* The owner must have at least read access. */
3248
3249         *posix_perms |= S_IRUSR;
3250         if (fsp->is_directory)
3251                 *posix_perms |= (S_IWUSR|S_IXUSR);
3252
3253         /* If requested apply the masks. */
3254
3255         /* Get the initial bits to apply. */
3256
3257         if (fsp->is_directory) {
3258                 and_bits = lp_dir_mask(snum);
3259                 or_bits = lp_force_dir_mode(snum);
3260         } else {
3261                 and_bits = lp_create_mask(snum);
3262                 or_bits = lp_force_create_mode(snum);
3263         }
3264
3265         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3266
3267         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3268                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3269                   (int)group_ace->perms, (int)other_ace->perms,
3270                   (int)*posix_perms, fsp_str_dbg(fsp)));
3271
3272         return True;
3273 }
3274
3275 /****************************************************************************
3276   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3277   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3278   with CI|OI set so it is inherited and also applies to the directory.
3279   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3280 ****************************************************************************/
3281
3282 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3283 {
3284         size_t i, j;
3285
3286         for (i = 0; i < num_aces; i++) {
3287                 for (j = i+1; j < num_aces; j++) {
3288                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3289                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3290                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3291                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3292
3293                         /* We know the lower number ACE's are file entries. */
3294                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3295                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3296                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3297                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3298                                 (i_inh == j_inh) &&
3299                                 (i_flags_ni == 0) &&
3300                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3301                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3302                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3303                                 /*
3304                                  * W2K wants to have access allowed zero access ACE's
3305                                  * at the end of the list. If the mask is zero, merge
3306                                  * the non-inherited ACE onto the inherited ACE.
3307                                  */
3308
3309                                 if (nt_ace_list[i].access_mask == 0) {
3310                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3311                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3312                                         if (num_aces - i - 1 > 0)
3313                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3314                                                                 sizeof(struct security_ace));
3315
3316                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3317                                                 (unsigned int)i, (unsigned int)j ));
3318                                 } else {
3319                                         /*
3320                                          * These are identical except for the flags.
3321                                          * Merge the inherited ACE onto the non-inherited ACE.
3322                                          */
3323
3324                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3325                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3326                                         if (num_aces - j - 1 > 0)
3327                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3328                                                                 sizeof(struct security_ace));
3329
3330                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3331                                                 (unsigned int)j, (unsigned int)i ));
3332                                 }
3333                                 num_aces--;
3334                                 break;
3335                         }
3336                 }
3337         }
3338
3339         return num_aces;
3340 }
3341
3342 /*
3343  * Add or Replace ACE entry.
3344  * In some cases we need to add a specific ACE for compatibility reasons.
3345  * When doing that we must make sure we are not actually creating a duplicate
3346  * entry. So we need to search whether an ACE entry already exist and eventually
3347  * replacce the access mask, or add a completely new entry if none was found.
3348  *
3349  * This function assumes the array has enough space to add a new entry without
3350  * any reallocation of memory.
3351  */
3352
3353 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3354                                 const struct dom_sid *sid, enum security_ace_type type,
3355                                 uint32_t mask, uint8_t flags)
3356 {
3357         int i;
3358
3359         /* first search for a duplicate */
3360         for (i = 0; i < *num_aces; i++) {
3361                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3362                     (nt_ace_list[i].flags == flags)) break;
3363         }
3364
3365         if (i < *num_aces) { /* found */
3366                 nt_ace_list[i].type = type;
3367                 nt_ace_list[i].access_mask = mask;
3368                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3369                            i, sid_string_dbg(sid), flags));
3370                 return;
3371         }
3372
3373         /* not found, append it */
3374         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3375 }
3376
3377
3378 /****************************************************************************
3379  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3380  the space for the return elements and returns the size needed to return the
3381  security descriptor. This should be the only external function needed for
3382  the UNIX style get ACL.
3383 ****************************************************************************/
3384
3385 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3386                                       const char *name,
3387                                       const SMB_STRUCT_STAT *sbuf,
3388                                       struct pai_val *pal,
3389                                       SMB_ACL_T posix_acl,
3390                                       SMB_ACL_T def_acl,
3391                                       uint32_t security_info,
3392                                       TALLOC_CTX *mem_ctx,
3393                                       struct security_descriptor **ppdesc)
3394 {
3395         struct dom_sid owner_sid;
3396         struct dom_sid group_sid;
3397         size_t sd_size = 0;
3398         struct security_acl *psa = NULL;
3399         size_t num_acls = 0;
3400         size_t num_def_acls = 0;
3401         size_t num_aces = 0;
3402         canon_ace *file_ace = NULL;
3403         canon_ace *dir_ace = NULL;
3404         struct security_ace *nt_ace_list = NULL;
3405         size_t num_profile_acls = 0;
3406         struct dom_sid orig_owner_sid;
3407         struct security_descriptor *psd = NULL;
3408         int i;
3409
3410         /*
3411          * Get the owner, group and world SIDs.
3412          */
3413
3414         create_file_sids(sbuf, &owner_sid, &group_sid);
3415
3416         if (lp_profile_acls(SNUM(conn))) {
3417                 /* For WXP SP1 the owner must be administrators. */
3418                 sid_copy(&orig_owner_sid, &owner_sid);
3419                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3420                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3421                 num_profile_acls = 3;
3422         }
3423
3424         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3425
3426                 /*
3427                  * In the optimum case Creator Owner and Creator Group would be used for
3428                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3429                  * would lead to usability problems under Windows: The Creator entries
3430                  * are only available in browse lists of directories and not for files;
3431                  * additionally the identity of the owning group couldn't be determined.
3432                  * We therefore use those identities only for Default ACLs.
3433                  */
3434
3435                 /* Create the canon_ace lists. */
3436                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3437                                             &owner_sid, &group_sid, pal,
3438                                             SMB_ACL_TYPE_ACCESS);
3439
3440                 /* We must have *some* ACLS. */
3441
3442                 if (count_canon_ace_list(file_ace) == 0) {
3443                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3444                         goto done;
3445                 }
3446
3447                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3448                         dir_ace = canonicalise_acl(conn, name, def_acl,
3449                                                    sbuf,
3450                                                    &global_sid_Creator_Owner,
3451                                                    &global_sid_Creator_Group,
3452                                                    pal, SMB_ACL_TYPE_DEFAULT);
3453                 }
3454
3455                 /*
3456                  * Create the NT ACE list from the canonical ace lists.
3457                  */
3458
3459                 {
3460                         canon_ace *ace;
3461                         enum security_ace_type nt_acl_type;
3462
3463                         if (nt4_compatible_acls() && dir_ace) {
3464                                 /*
3465                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3466                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3467                                  * remove entries from the Access ACL if the
3468                                  * corresponding Default ACL entries have also been
3469                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3470                                  * are exceptions. We can do nothing
3471                                  * intelligent if the Default ACL contains entries that
3472                                  * are not also contained in the Access ACL, so this
3473                                  * case will still fail under NT 4.
3474                                  */
3475
3476                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3477                                 if (ace && !ace->perms) {
3478                                         DLIST_REMOVE(dir_ace, ace);
3479                                         TALLOC_FREE(ace);
3480
3481                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3482                                         if (ace && !ace->perms) {
3483                                                 DLIST_REMOVE(file_ace, ace);
3484                                                 TALLOC_FREE(ace);
3485                                         }
3486                                 }
3487
3488                                 /*
3489                                  * WinNT doesn't usually have Creator Group
3490                                  * in browse lists, so we send this entry to
3491                                  * WinNT even if it contains no relevant
3492                                  * permissions. Once we can add
3493                                  * Creator Group to browse lists we can
3494                                  * re-enable this.
3495                                  */
3496
3497 #if 0
3498                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3499                                 if (ace && !ace->perms) {
3500                                         DLIST_REMOVE(dir_ace, ace);
3501                                         TALLOC_FREE(ace);
3502                                 }
3503 #endif
3504
3505                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3506                                 if (ace && !ace->perms) {
3507                                         DLIST_REMOVE(file_ace, ace);
3508                                         TALLOC_FREE(ace);
3509                                 }
3510                         }
3511
3512                         num_acls = count_canon_ace_list(file_ace);
3513                         num_def_acls = count_canon_ace_list(dir_ace);
3514
3515                         /* Allocate the ace list. */
3516                         if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3517                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3518                                 goto done;
3519                         }
3520
3521                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3522
3523                         /*
3524                          * Create the NT ACE list from the canonical ace lists.
3525                          */
3526
3527                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3528                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3529                                                 &nt_acl_type,
3530                                                 ace->perms,
3531                                                 S_ISDIR(sbuf->st_ex_mode));
3532                                 init_sec_ace(&nt_ace_list[num_aces++],
3533                                         &ace->trustee,
3534                                         nt_acl_type,
3535                                         acc,
3536                                         ace->ace_flags);
3537                         }
3538
3539                         /* The User must have access to a profile share - even
3540                          * if we can't map the SID. */
3541                         if (lp_profile_acls(SNUM(conn))) {
3542                                 add_or_replace_ace(nt_ace_list, &num_aces,
3543                                                    &global_sid_Builtin_Users,
3544                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3545                                                    FILE_GENERIC_ALL, 0);
3546                         }
3547
3548                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3549                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3550                                                 &nt_acl_type,
3551                                                 ace->perms,
3552                                                 S_ISDIR(sbuf->st_ex_mode));
3553                                 init_sec_ace(&nt_ace_list[num_aces++],
3554                                         &ace->trustee,
3555                                         nt_acl_type,
3556                                         acc,
3557                                         ace->ace_flags |
3558                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3559                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3560                                         SEC_ACE_FLAG_INHERIT_ONLY);
3561                         }
3562
3563                         /* The User must have access to a profile share - even
3564                          * if we can't map the SID. */
3565                         if (lp_profile_acls(SNUM(conn))) {
3566                                 add_or_replace_ace(nt_ace_list, &num_aces,
3567                                                 &global_sid_Builtin_Users,
3568                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3569                                                 FILE_GENERIC_ALL,
3570                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3571                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3572                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3573                         }
3574
3575                         /*
3576                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3577                          * Win2K needs this to get the inheritance correct when replacing ACLs
3578                          * on a directory tree. Based on work by Jim @ IBM.
3579                          */
3580
3581                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3582
3583                         if (lp_profile_acls(SNUM(conn))) {
3584                                 for (i = 0; i < num_aces; i++) {
3585                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3586                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3587                                                                    &orig_owner_sid,
3588                                                                    nt_ace_list[i].type,
3589                                                                    nt_ace_list[i].access_mask,
3590                                                                    nt_ace_list[i].flags);
3591                                                 break;
3592                                         }
3593                                 }
3594                         }
3595                 }
3596
3597                 if (num_aces) {
3598                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3599                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3600                                 goto done;
3601                         }
3602                 }
3603         } /* security_info & SECINFO_DACL */
3604
3605         psd = make_standard_sec_desc(mem_ctx,
3606                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3607                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3608                         psa,
3609                         &sd_size);
3610
3611         if(!psd) {
3612                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3613                 sd_size = 0;
3614                 goto done;
3615         }
3616
3617         /*
3618          * Windows 2000: The DACL_PROTECTED flag in the security
3619          * descriptor marks the ACL as non-inheriting, i.e., no
3620          * ACEs from higher level directories propagate to this
3621          * ACL. In the POSIX ACL model permissions are only
3622          * inherited at file create time, so ACLs never contain
3623          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3624          * flag doesn't seem to bother Windows NT.
3625          * Always set this if map acl inherit is turned off.
3626          */
3627         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3628                 psd->type |= SEC_DESC_DACL_PROTECTED;
3629         } else {
3630                 psd->type |= pal->sd_type;
3631         }
3632
3633         if (psd->dacl) {
3634                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3635         }
3636
3637         *ppdesc = psd;
3638
3639  done:
3640
3641         if (posix_acl) {
3642                 TALLOC_FREE(posix_acl);
3643         }
3644         if (def_acl) {
3645                 TALLOC_FREE(def_acl);
3646         }
3647         free_canon_ace_list(file_ace);
3648         free_canon_ace_list(dir_ace);
3649         free_inherited_info(pal);
3650         TALLOC_FREE(nt_ace_list);
3651
3652         return NT_STATUS_OK;
3653 }
3654
3655 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3656                            TALLOC_CTX *mem_ctx,
3657                            struct security_descriptor **ppdesc)
3658 {
3659         SMB_STRUCT_STAT sbuf;
3660         SMB_ACL_T posix_acl = NULL;
3661         struct pai_val *pal;
3662         TALLOC_CTX *frame = talloc_stackframe();
3663         NTSTATUS status;
3664
3665         *ppdesc = NULL;
3666
3667         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3668                   fsp_str_dbg(fsp)));
3669
3670         /* can it happen that fsp_name == NULL ? */
3671         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3672                 status = posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3673                                           security_info, mem_ctx, ppdesc);
3674                 TALLOC_FREE(frame);
3675                 return status;
3676         }
3677
3678         /* Get the stat struct for the owner info. */
3679         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3680                 TALLOC_FREE(frame);
3681                 return map_nt_error_from_unix(errno);
3682         }
3683
3684         /* Get the ACL from the fd. */
3685         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, frame);
3686
3687         pal = fload_inherited_info(fsp);
3688
3689         status = posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3690                                          &sbuf, pal, posix_acl, NULL,
3691                                          security_info, mem_ctx, ppdesc);
3692         TALLOC_FREE(frame);
3693         return status;
3694 }
3695
3696 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3697                           uint32_t security_info,
3698                           TALLOC_CTX *mem_ctx,
3699                           struct security_descriptor **ppdesc)
3700 {
3701         SMB_ACL_T posix_acl = NULL;
3702         SMB_ACL_T def_acl = NULL;
3703         struct pai_val *pal;
3704         struct smb_filename smb_fname;
3705         int ret;
3706         TALLOC_CTX *frame = talloc_stackframe();
3707         NTSTATUS status;
3708
3709         *ppdesc = NULL;
3710
3711         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3712
3713         ZERO_STRUCT(smb_fname);
3714         smb_fname.base_name = discard_const_p(char, name);
3715
3716         /* Get the stat struct for the owner info. */
3717         if (lp_posix_pathnames()) {
3718                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3719         } else {
3720                 ret = SMB_VFS_STAT(conn, &smb_fname);
3721         }
3722
3723         if (ret == -1) {
3724                 TALLOC_FREE(frame);
3725                 return map_nt_error_from_unix(errno);
3726         }
3727
3728         /* Get the ACL from the path. */
3729         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name,
3730                                              SMB_ACL_TYPE_ACCESS, frame);
3731
3732         /* If it's a directory get the default POSIX ACL. */
3733         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3734                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name,
3735                                                    SMB_ACL_TYPE_DEFAULT, frame);
3736                 def_acl = free_empty_sys_acl(conn, def_acl);
3737         }
3738
3739         pal = load_inherited_info(conn, name);
3740
3741         status = posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3742                                          posix_acl, def_acl, security_info,
3743                                          mem_ctx,
3744                                          ppdesc);
3745         TALLOC_FREE(frame);
3746         return status;
3747 }
3748
3749 /****************************************************************************
3750  Try to chown a file. We will be able to chown it under the following conditions.
3751
3752   1) If we have root privileges, then it will just work.
3753   2) If we have SeRestorePrivilege we can change the user + group to any other user.
3754   3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3755   4) If we have write permission to the file and dos_filemodes is set
3756      then allow chown to the currently authenticated user.
3757 ****************************************************************************/
3758
3759 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3760 {
3761         NTSTATUS status;
3762
3763         if(!CAN_WRITE(fsp->conn)) {
3764                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3765         }
3766
3767         /* Case (1). */
3768         status = vfs_chown_fsp(fsp, uid, gid);
3769         if (NT_STATUS_IS_OK(status)) {
3770                 return status;
3771         }
3772
3773         /* Case (2) / (3) */
3774         if (lp_enable_privileges()) {
3775                 bool has_take_ownership_priv = security_token_has_privilege(
3776                                                 get_current_nttok(fsp->conn),
3777                                                 SEC_PRIV_TAKE_OWNERSHIP);
3778                 bool has_restore_priv = security_token_has_privilege(
3779                                                 get_current_nttok(fsp->conn),
3780                                                 SEC_PRIV_RESTORE);
3781
3782                 if (has_restore_priv) {
3783                         ; /* Case (2) */
3784                 } else if (has_take_ownership_priv) {
3785                         /* Case (3) */
3786                         if (uid == get_current_uid(fsp->conn)) {
3787                                 gid = (gid_t)-1;
3788                         } else {
3789                                 has_take_ownership_priv = false;
3790                         }
3791                 }
3792
3793                 if (has_take_ownership_priv || has_restore_priv) {
3794                         become_root();
3795                         status = vfs_chown_fsp(fsp, uid, gid);
3796                         unbecome_root();
3797                         return status;
3798                 }
3799         }
3800
3801         /* Case (4). */
3802         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3803                 return NT_STATUS_ACCESS_DENIED;
3804         }
3805
3806         /* only allow chown to the current user. This is more secure,
3807            and also copes with the case where the SID in a take ownership ACL is
3808            a local SID on the users workstation
3809         */
3810         if (uid != get_current_uid(fsp->conn)) {
3811                 return NT_STATUS_ACCESS_DENIED;
3812         }
3813
3814         become_root();
3815         /* Keep the current file gid the same. */
3816         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3817         unbecome_root();
3818
3819         return status;
3820 }
3821
3822 #if 0
3823 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3824
3825 /****************************************************************************
3826  Take care of parent ACL inheritance.
3827 ****************************************************************************/
3828
3829 NTSTATUS append_parent_acl(files_struct *fsp,
3830                                 const struct security_descriptor *pcsd,
3831                                 struct security_descriptor **pp_new_sd)
3832 {
3833         struct smb_filename *smb_dname = NULL;
3834         struct security_descriptor *parent_sd = NULL;
3835         files_struct *parent_fsp = NULL;
3836         TALLOC_CTX *mem_ctx = talloc_tos();
3837         char *parent_name = NULL;
3838         struct security_ace *new_ace = NULL;
3839         unsigned int num_aces = pcsd->dacl->num_aces;
3840         NTSTATUS status;
3841         int info;
3842         unsigned int i, j;
3843         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3844         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3845
3846         if (psd == NULL) {
3847                 return NT_STATUS_NO_MEMORY;
3848         }
3849
3850         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3851                             NULL)) {
3852                 return NT_STATUS_NO_MEMORY;
3853         }
3854
3855         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3856                                             &smb_dname);
3857         if (!NT_STATUS_IS_OK(status)) {
3858                 goto fail;
3859         }
3860
3861         status = SMB_VFS_CREATE_FILE(
3862                 fsp->conn,                              /* conn */
3863                 NULL,                                   /* req */
3864                 0,                                      /* root_dir_fid */
3865                 smb_dname,                              /* fname */
3866                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3867                 FILE_SHARE_NONE,                        /* share_access */
3868                 FILE_OPEN,                              /* create_disposition*/
3869                 FILE_DIRECTORY_FILE,                    /* create_options */
3870                 0,                                      /* file_attributes */
3871                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3872                 0,                                      /* allocation_size */
3873                 NULL,                                   /* sd */
3874                 NULL,                                   /* ea_list */
3875                 &parent_fsp,                            /* result */
3876                 &info);                                 /* pinfo */
3877
3878         if (!NT_STATUS_IS_OK(status)) {
3879                 TALLOC_FREE(smb_dname);
3880                 return status;
3881         }
3882
3883         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3884                                     SECINFO_DACL, &parent_sd );
3885
3886         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3887         TALLOC_FREE(smb_dname);
3888
3889         if (!NT_STATUS_IS_OK(status)) {
3890                 return status;
3891         }
3892
3893         /*
3894          * Make room for potentially all the ACLs from
3895          * the parent. We used to add the ugw triple here,
3896          * as we knew we were dealing with POSIX ACLs.
3897          * We no longer need to do so as we can guarentee
3898          * that a default ACL from the parent directory will
3899          * be well formed for POSIX ACLs if it came from a
3900          * POSIX ACL source, and if we're not writing to a
3901          * POSIX ACL sink then we don't care if it's not well
3902          * formed. JRA.
3903          */
3904
3905         num_aces += parent_sd->dacl->num_aces;
3906
3907         if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3908                                         num_aces)) == NULL) {
3909                 return NT_STATUS_NO_MEMORY;
3910         }
3911
3912         /* Start by copying in all the given ACE entries. */
3913         for (i = 0; i < psd->dacl->num_aces; i++) {
3914                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3915         }
3916
3917         /*
3918          * Note that we're ignoring "inherit permissions" here
3919          * as that really only applies to newly created files. JRA.
3920          */
3921
3922         /* Finally append any inherited ACEs. */
3923         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3924                 struct security_ace *se = &parent_sd->dacl->aces[j];
3925
3926                 if (fsp->is_directory) {
3927                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3928                                 /* Doesn't apply to a directory - ignore. */
3929                                 DEBUG(10,("append_parent_acl: directory %s "
3930                                         "ignoring non container "
3931                                         "inherit flags %u on ACE with sid %s "
3932                                         "from parent %s\n",
3933                                         fsp_str_dbg(fsp),
3934                                         (unsigned int)se->flags,
3935                                         sid_string_dbg(&se->trustee),
3936                                         parent_name));
3937                                 continue;
3938                         }
3939                 } else {
3940                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3941                                 /* Doesn't apply to a file - ignore. */
3942                                 DEBUG(10,("append_parent_acl: file %s "
3943                                         "ignoring non object "
3944                                         "inherit flags %u on ACE with sid %s "
3945                                         "from parent %s\n",
3946                                         fsp_str_dbg(fsp),
3947                                         (unsigned int)se->flags,
3948                                         sid_string_dbg(&se->trustee),
3949                                         parent_name));
3950                                 continue;
3951                         }
3952                 }
3953
3954                 if (is_dacl_protected) {
3955                         /* If the DACL is protected it means we must
3956                          * not overwrite an existing ACE entry with the
3957                          * same SID. This is order N^2. Ouch :-(. JRA. */
3958                         unsigned int k;
3959                         for (k = 0; k < psd->dacl->num_aces; k++) {
3960                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3961                                                 &se->trustee)) {
3962                                         break;
3963                                 }
3964                         }
3965                         if (k < psd->dacl->num_aces) {
3966                                 /* SID matched. Ignore. */
3967                                 DEBUG(10,("append_parent_acl: path %s "
3968                                         "ignoring ACE with protected sid %s "
3969                                         "from parent %s\n",
3970                                         fsp_str_dbg(fsp),
3971                                         sid_string_dbg(&se->trustee),
3972                                         parent_name));
3973                                 continue;
3974                         }
3975                 }
3976
3977                 sec_ace_copy(&new_ace[i], se);
3978                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3979                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3980                 }
3981                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3982
3983                 if (fsp->is_directory) {
3984                         /*
3985                          * Strip off any inherit only. It's applied.
3986                          */
3987                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3988                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3989                                 /* No further inheritance. */
3990                                 new_ace[i].flags &=
3991                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3992                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3993                         }
3994                 } else {
3995                         /*
3996                          * Strip off any container or inherit
3997                          * flags, they can't apply to objects.
3998                          */
3999                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
4000                                                 SEC_ACE_FLAG_INHERIT_ONLY|
4001                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
4002                 }
4003                 i++;
4004
4005                 DEBUG(10,("append_parent_acl: path %s "
4006                         "inheriting ACE with sid %s "
4007                         "from parent %s\n",
4008                         fsp_str_dbg(fsp),
4009                         sid_string_dbg(&se->trustee),
4010                         parent_name));
4011         }
4012
4013         psd->dacl->aces = new_ace;
4014         psd->dacl->num_aces = i;
4015         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
4016                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
4017
4018         *pp_new_sd = psd;
4019         return status;
4020 }
4021 #endif
4022
4023 /****************************************************************************
4024  Reply to set a security descriptor on an fsp. security_info_sent is the
4025  description of the following NT ACL.
4026  This should be the only external function needed for the UNIX style set ACL.
4027  We make a copy of psd_orig as internal functions modify the elements inside
4028  it, even though it's a const pointer.
4029 ****************************************************************************/
4030
4031 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
4032 {
4033         connection_struct *conn = fsp->conn;
4034         uid_t user = (uid_t)-1;
4035         gid_t grp = (gid_t)-1;
4036         struct dom_sid file_owner_sid;
4037         struct dom_sid file_grp_sid;
4038         canon_ace *file_ace_list = NULL;
4039         canon_ace *dir_ace_list = NULL;
4040         bool acl_perms = False;
4041         mode_t orig_mode = (mode_t)0;
4042         NTSTATUS status;
4043         bool set_acl_as_root = false;
4044         bool acl_set_support = false;
4045         bool ret = false;
4046         struct security_descriptor *psd = NULL;
4047
4048         DEBUG(10,("set_nt_acl: called for file %s\n",
4049                   fsp_str_dbg(fsp)));
4050
4051         if (!CAN_WRITE(conn)) {
4052                 DEBUG(10,("set acl rejected on read-only share\n"));
4053                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
4054         }
4055
4056         if (!psd_orig) {
4057                 return NT_STATUS_INVALID_PARAMETER;
4058         }
4059
4060         psd = dup_sec_desc(talloc_tos(), psd_orig);
4061         if (!psd) {
4062                 return NT_STATUS_NO_MEMORY;
4063         }
4064
4065         /*
4066          * Get the current state of the file.
4067          */
4068
4069         status = vfs_stat_fsp(fsp);
4070         if (!NT_STATUS_IS_OK(status)) {
4071                 return status;
4072         }
4073
4074         /* Save the original element we check against. */
4075         orig_mode = fsp->fsp_name->st.st_ex_mode;
4076
4077         /*
4078          * Unpack the user/group/world id's.
4079          */
4080
4081         /* POSIX can't cope with missing owner/group. */
4082         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
4083                 security_info_sent &= ~SECINFO_OWNER;
4084         }
4085         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
4086                 security_info_sent &= ~SECINFO_GROUP;
4087         }
4088
4089         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
4090         if (!NT_STATUS_IS_OK(status)) {
4091                 return status;
4092         }
4093
4094         /*
4095          * Do we need to chown ? If so this must be done first as the incoming
4096          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
4097          * Noticed by Simo.
4098          */
4099
4100         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
4101             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
4102
4103                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
4104                          fsp_str_dbg(fsp), (unsigned int)user,
4105                          (unsigned int)grp));
4106
4107                 status = try_chown(fsp, user, grp);
4108                 if(!NT_STATUS_IS_OK(status)) {
4109                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
4110                                 "= %s.\n", fsp_str_dbg(fsp),
4111                                 (unsigned int)user,
4112                                 (unsigned int)grp,
4113                                 nt_errstr(status)));
4114                         return status;
4115                 }
4116
4117                 /*
4118                  * Recheck the current state of the file, which may have changed.
4119                  * (suid/sgid bits, for instance)
4120                  */
4121
4122                 status = vfs_stat_fsp(fsp);
4123                 if (!NT_STATUS_IS_OK(status)) {
4124                         return status;
4125                 }
4126
4127                 /* Save the original element we check against. */
4128                 orig_mode = fsp->fsp_name->st.st_ex_mode;
4129
4130                 /* If we successfully chowned, we know we must
4131                  * be able to set the acl, so do it as root.
4132                  */
4133                 set_acl_as_root = true;
4134         }
4135
4136         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
4137
4138         if((security_info_sent & SECINFO_DACL) &&
4139                         (psd->type & SEC_DESC_DACL_PRESENT) &&
4140                         (psd->dacl == NULL)) {
4141                 struct security_ace ace[3];
4142
4143                 /* We can't have NULL DACL in POSIX.
4144                    Use owner/group/Everyone -> full access. */
4145
4146                 init_sec_ace(&ace[0],
4147                                 &file_owner_sid,
4148                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4149                                 GENERIC_ALL_ACCESS,
4150                                 0);
4151                 init_sec_ace(&ace[1],
4152                                 &file_grp_sid,
4153                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4154                                 GENERIC_ALL_ACCESS,
4155                                 0);
4156                 init_sec_ace(&ace[2],
4157                                 &global_sid_World,
4158                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4159                                 GENERIC_ALL_ACCESS,
4160                                 0);
4161                 psd->dacl = make_sec_acl(talloc_tos(),
4162                                         NT4_ACL_REVISION,
4163                                         3,
4164                                         ace);
4165                 if (psd->dacl == NULL) {
4166                         return NT_STATUS_NO_MEMORY;
4167                 }
4168                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
4169         }
4170
4171         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
4172                                      &file_grp_sid, &file_ace_list,
4173                                      &dir_ace_list, security_info_sent, psd);
4174
4175         /* Ignore W2K traverse DACL set. */
4176         if (!file_ace_list && !dir_ace_list) {
4177                 return NT_STATUS_OK;
4178         }
4179
4180         if (!acl_perms) {
4181                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
4182                 free_canon_ace_list(file_ace_list);
4183                 free_canon_ace_list(dir_ace_list);
4184                 return NT_STATUS_ACCESS_DENIED;
4185         }
4186
4187         /*
4188          * Only change security if we got a DACL.
4189          */
4190
4191         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
4192                 free_canon_ace_list(file_ace_list);
4193                 free_canon_ace_list(dir_ace_list);
4194                 return NT_STATUS_OK;
4195         }
4196
4197         /*
4198          * Try using the POSIX ACL set first. Fall back to chmod if
4199          * we have no ACL support on this filesystem.
4200          */
4201
4202         if (acl_perms && file_ace_list) {
4203                 if (set_acl_as_root) {
4204                         become_root();
4205                 }
4206                 ret = set_canon_ace_list(fsp, file_ace_list, false,
4207                                          &fsp->fsp_name->st, &acl_set_support);
4208                 if (set_acl_as_root) {
4209                         unbecome_root();
4210                 }
4211                 if (acl_set_support && ret == false) {
4212                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
4213                                  "%s (%s).\n", fsp_str_dbg(fsp),
4214                                  strerror(errno)));
4215                         free_canon_ace_list(file_ace_list);
4216                         free_canon_ace_list(dir_ace_list);
4217                         return map_nt_error_from_unix(errno);
4218                 }
4219         }
4220
4221         if (acl_perms && acl_set_support && fsp->is_directory) {
4222                 if (dir_ace_list) {
4223                         if (set_acl_as_root) {
4224                                 become_root();
4225                         }
4226                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
4227                                                  &fsp->fsp_name->st,
4228                                                  &acl_set_support);
4229                         if (set_acl_as_root) {
4230                                 unbecome_root();
4231                         }
4232                         if (ret == false) {
4233                                 DEBUG(3,("set_nt_acl: failed to set default "
4234                                          "acl on directory %s (%s).\n",
4235                                          fsp_str_dbg(fsp), strerror(errno)));
4236                                 free_canon_ace_list(file_ace_list);
4237                                 free_canon_ace_list(dir_ace_list);
4238                                 return map_nt_error_from_unix(errno);
4239                         }
4240                 } else {
4241                         int sret = -1;
4242
4243                         /*
4244                          * No default ACL - delete one if it exists.
4245                          */
4246
4247                         if (set_acl_as_root) {
4248                                 become_root();
4249                         }
4250                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4251                             fsp->fsp_name->base_name);
4252                         if (set_acl_as_root) {
4253                                 unbecome_root();
4254                         }
4255                         if (sret == -1) {
4256                                 if (acl_group_override(conn, fsp->fsp_name)) {
4257                                         DEBUG(5,("set_nt_acl: acl group "
4258                                                  "control on and current user "
4259                                                  "in file %s primary group. "
4260                                                  "Override delete_def_acl\n",
4261                                                  fsp_str_dbg(fsp)));
4262
4263                                         become_root();
4264                                         sret =
4265                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4266                                                     conn,
4267                                                     fsp->fsp_name->base_name);
4268                                         unbecome_root();
4269                                 }
4270
4271                                 if (sret == -1) {
4272                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4273                                         free_canon_ace_list(file_ace_list);
4274                                         free_canon_ace_list(dir_ace_list);
4275                                         return map_nt_error_from_unix(errno);
4276                                 }
4277                         }
4278                 }
4279         }
4280
4281         if (acl_set_support) {
4282                 if (set_acl_as_root) {
4283                         become_root();
4284                 }
4285                 store_inheritance_attributes(fsp,
4286                                 file_ace_list,
4287                                 dir_ace_list,
4288                                 psd->type);
4289                 if (set_acl_as_root) {
4290                         unbecome_root();
4291                 }
4292         }
4293
4294         /*
4295          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4296          */
4297
4298         if(!acl_set_support && acl_perms) {
4299                 mode_t posix_perms;
4300
4301                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4302                         free_canon_ace_list(file_ace_list);
4303                         free_canon_ace_list(dir_ace_list);
4304                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4305                                  "posix permissions for file %s.\n",
4306                                  fsp_str_dbg(fsp)));
4307                         return NT_STATUS_ACCESS_DENIED;
4308                 }
4309
4310                 if (orig_mode != posix_perms) {
4311                         int sret = -1;
4312
4313                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4314                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4315
4316                         if (set_acl_as_root) {
4317                                 become_root();
4318                         }
4319                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4320                                              posix_perms);
4321                         if (set_acl_as_root) {
4322                                 unbecome_root();
4323                         }
4324                         if(sret == -1) {
4325                                 if (acl_group_override(conn, fsp->fsp_name)) {
4326                                         DEBUG(5,("set_nt_acl: acl group "
4327                                                  "control on and current user "
4328                                                  "in file %s primary group. "
4329                                                  "Override chmod\n",
4330                                                  fsp_str_dbg(fsp)));
4331
4332                                         become_root();
4333                                         sret = SMB_VFS_CHMOD(conn,
4334                                             fsp->fsp_name->base_name,
4335                                             posix_perms);
4336                                         unbecome_root();
4337                                 }
4338
4339                                 if (sret == -1) {
4340                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4341                                                  "failed. Error = %s.\n",
4342                                                  fsp_str_dbg(fsp),
4343                                                  (unsigned int)posix_perms,
4344                                                  strerror(errno)));
4345                                         free_canon_ace_list(file_ace_list);
4346                                         free_canon_ace_list(dir_ace_list);
4347                                         return map_nt_error_from_unix(errno);
4348                                 }
4349                         }
4350                 }
4351         }
4352
4353         free_canon_ace_list(file_ace_list);
4354         free_canon_ace_list(dir_ace_list);
4355
4356         /* Ensure the stat struct in the fsp is correct. */
4357         status = vfs_stat_fsp(fsp);
4358
4359         return NT_STATUS_OK;
4360 }
4361
4362 /****************************************************************************
4363  Get the actual group bits stored on a file with an ACL. Has no effect if
4364  the file has no ACL. Needed in dosmode code where the stat() will return
4365  the mask bits, not the real group bits, for a file with an ACL.
4366 ****************************************************************************/
4367
4368 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4369 {
4370         int entry_id = SMB_ACL_FIRST_ENTRY;
4371         SMB_ACL_ENTRY_T entry;
4372         SMB_ACL_T posix_acl;
4373         int result = -1;
4374
4375         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4376                                              SMB_ACL_TYPE_ACCESS, talloc_tos());
4377         if (posix_acl == (SMB_ACL_T)NULL)
4378                 return -1;
4379
4380         while (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4381                 SMB_ACL_TAG_T tagtype;
4382                 SMB_ACL_PERMSET_T permset;
4383
4384                 entry_id = SMB_ACL_NEXT_ENTRY;
4385
4386                 if (sys_acl_get_tag_type(entry, &tagtype) ==-1)
4387                         break;
4388
4389                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4390                         if (sys_acl_get_permset(entry, &permset) == -1) {
4391                                 break;
4392                         } else {
4393                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4394                                 *mode |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRGRP : 0);
4395                                 *mode |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4396                                 *mode |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4397                                 result = 0;
4398                                 break;
4399                         }
4400                 }
4401         }
4402         TALLOC_FREE(posix_acl);
4403         return result;
4404 }
4405
4406 /****************************************************************************
4407  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4408  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4409 ****************************************************************************/
4410
4411 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4412 {
4413         int entry_id = SMB_ACL_FIRST_ENTRY;
4414         SMB_ACL_ENTRY_T entry;
4415         int num_entries = 0;
4416
4417         while ( sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4418                 SMB_ACL_TAG_T tagtype;
4419                 SMB_ACL_PERMSET_T permset;
4420                 mode_t perms;
4421
4422                 entry_id = SMB_ACL_NEXT_ENTRY;
4423
4424                 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
4425                         return -1;
4426
4427                 if (sys_acl_get_permset(entry, &permset) == -1)
4428                         return -1;
4429
4430                 num_entries++;
4431
4432                 switch(tagtype) {
4433                         case SMB_ACL_USER_OBJ:
4434                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4435                                 break;
4436                         case SMB_ACL_GROUP_OBJ:
4437                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4438                                 break;
4439                         case SMB_ACL_MASK:
4440                                 /*
4441                                  * FIXME: The ACL_MASK entry permissions should really be set to
4442                                  * the union of the permissions of all ACL_USER,
4443                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4444                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4445                                  */
4446                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4447                                 break;
4448                         case SMB_ACL_OTHER:
4449                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4450                                 break;
4451                         default:
4452                                 continue;
4453                 }
4454
4455                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4456                         return -1;
4457
4458                 if (sys_acl_set_permset(entry, permset) == -1)
4459                         return -1;
4460         }
4461
4462         /*
4463          * If this is a simple 3 element ACL or no elements then it's a standard
4464          * UNIX permission set. Just use chmod...
4465          */
4466
4467         if ((num_entries == 3) || (num_entries == 0))
4468                 return -1;
4469
4470         return 0;
4471 }
4472
4473 /****************************************************************************
4474  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4475  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4476  resulting ACL on TO.  Note that name is in UNIX character set.
4477 ****************************************************************************/
4478
4479 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4480 {
4481         SMB_ACL_T posix_acl = NULL;
4482         int ret = -1;
4483
4484         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from,
4485                                                   SMB_ACL_TYPE_ACCESS,
4486                                                   talloc_tos())) == NULL)
4487                 return -1;
4488
4489         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4490                 goto done;
4491
4492         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4493
4494  done:
4495
4496         TALLOC_FREE(posix_acl);
4497         return ret;
4498 }
4499
4500 /****************************************************************************
4501  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4502  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4503  Note that name is in UNIX character set.
4504 ****************************************************************************/
4505
4506 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4507 {
4508         return copy_access_posix_acl(conn, name, name, mode);
4509 }
4510
4511 /****************************************************************************
4512  Check for an existing default POSIX ACL on a directory.
4513 ****************************************************************************/
4514
4515 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4516 {
4517         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4518                                                      SMB_ACL_TYPE_DEFAULT,
4519                                                      talloc_tos());
4520         bool has_acl = False;
4521         SMB_ACL_ENTRY_T entry;
4522
4523         if (def_acl != NULL && (sys_acl_get_entry(def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4524                 has_acl = True;
4525         }
4526
4527         if (def_acl) {
4528                 TALLOC_FREE(def_acl);
4529         }
4530         return has_acl;
4531 }
4532
4533 /****************************************************************************
4534  If the parent directory has no default ACL but it does have an Access ACL,
4535  inherit this Access ACL to file name.
4536 ****************************************************************************/
4537
4538 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4539                        const char *name, mode_t mode)
4540 {
4541         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4542                 return 0;
4543
4544         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4545 }
4546
4547 /****************************************************************************
4548  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4549  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4550 ****************************************************************************/
4551
4552 int fchmod_acl(files_struct *fsp, mode_t mode)
4553 {
4554         connection_struct *conn = fsp->conn;
4555         SMB_ACL_T posix_acl = NULL;
4556         int ret = -1;
4557
4558         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos())) == NULL)
4559                 return -1;
4560
4561         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4562                 goto done;
4563
4564         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4565
4566   done:
4567
4568         TALLOC_FREE(posix_acl);
4569         return ret;
4570 }
4571
4572 /****************************************************************************
4573  Map from wire type to permset.
4574 ****************************************************************************/
4575
4576 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4577 {
4578         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4579                 return False;
4580         }
4581
4582         if (sys_acl_clear_perms(*p_permset) ==  -1) {
4583                 return False;
4584         }
4585
4586         if (wire_perm & SMB_POSIX_ACL_READ) {
4587                 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1) {
4588                         return False;
4589                 }
4590         }
4591         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4592                 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1) {
4593                         return False;
4594                 }
4595         }
4596         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4597                 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1) {
4598                         return False;
4599                 }
4600         }
4601         return True;
4602 }
4603
4604 /****************************************************************************
4605  Map from wire type to tagtype.
4606 ****************************************************************************/
4607
4608 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4609 {
4610         switch (wire_tt) {
4611                 case SMB_POSIX_ACL_USER_OBJ:
4612                         *p_tt = SMB_ACL_USER_OBJ;
4613                         break;
4614                 case SMB_POSIX_ACL_USER:
4615                         *p_tt = SMB_ACL_USER;
4616                         break;
4617                 case SMB_POSIX_ACL_GROUP_OBJ:
4618                         *p_tt = SMB_ACL_GROUP_OBJ;
4619                         break;
4620                 case SMB_POSIX_ACL_GROUP:
4621                         *p_tt = SMB_ACL_GROUP;
4622                         break;
4623                 case SMB_POSIX_ACL_MASK:
4624                         *p_tt = SMB_ACL_MASK;
4625                         break;
4626                 case SMB_POSIX_ACL_OTHER:
4627                         *p_tt = SMB_ACL_OTHER;
4628                         break;
4629                 default:
4630                         return False;
4631         }
4632         return True;
4633 }
4634
4635 /****************************************************************************
4636  Create a new POSIX acl from wire permissions.
4637  FIXME ! How does the share mask/mode fit into this.... ?
4638 ****************************************************************************/
4639
4640 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn,
4641                                             uint16 num_acls,
4642                                             const char *pdata,
4643                                             TALLOC_CTX *mem_ctx)
4644 {
4645         unsigned int i;
4646         SMB_ACL_T the_acl = sys_acl_init(mem_ctx);
4647
4648         if (the_acl == NULL) {
4649                 return NULL;
4650         }
4651
4652         for (i = 0; i < num_acls; i++) {
4653                 SMB_ACL_ENTRY_T the_entry;
4654                 SMB_ACL_PERMSET_T the_permset;
4655                 SMB_ACL_TAG_T tag_type;
4656
4657                 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
4658                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4659                                 i, strerror(errno) ));
4660                         goto fail;
4661                 }
4662
4663                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4664                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4665                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4666                         goto fail;
4667                 }
4668
4669                 if (sys_acl_set_tag_type(the_entry, tag_type) == -1) {
4670                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4671                                 i, strerror(errno) ));
4672                         goto fail;
4673                 }
4674
4675                 /* Get the permset pointer from the new ACL entry. */
4676                 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
4677                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4678                                 i, strerror(errno) ));
4679                         goto fail;
4680                 }
4681
4682                 /* Map from wire to permissions. */
4683                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4684                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4685                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4686                         goto fail;
4687                 }
4688
4689                 /* Now apply to the new ACL entry. */
4690                 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
4691                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4692                                 i, strerror(errno) ));
4693                         goto fail;
4694                 }
4695
4696                 if (tag_type == SMB_ACL_USER) {
4697                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4698                         uid_t uid = (uid_t)uidval;
4699                         if (sys_acl_set_qualifier(the_entry,(void *)&uid) == -1) {
4700                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4701                                         (unsigned int)uid, i, strerror(errno) ));
4702                                 goto fail;
4703                         }
4704                 }
4705
4706                 if (tag_type == SMB_ACL_GROUP) {
4707                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4708                         gid_t gid = (uid_t)gidval;
4709                         if (sys_acl_set_qualifier(the_entry,(void *)&gid) == -1) {
4710                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4711                                         (unsigned int)gid, i, strerror(errno) ));
4712                                 goto fail;
4713                         }
4714                 }
4715         }
4716
4717         return the_acl;
4718
4719  fail:
4720
4721         if (the_acl != NULL) {
4722                 TALLOC_FREE(the_acl);
4723         }
4724         return NULL;
4725 }
4726
4727 /****************************************************************************
4728  Calls from UNIX extensions - Default POSIX ACL set.
4729  If num_def_acls == 0 and not a directory just return. If it is a directory
4730  and num_def_acls == 0 then remove the default acl. Else set the default acl
4731  on the directory.
4732 ****************************************************************************/
4733
4734 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4735                                 uint16 num_def_acls, const char *pdata)
4736 {
4737         SMB_ACL_T def_acl = NULL;
4738
4739         if (!S_ISDIR(psbuf->st_ex_mode)) {
4740                 if (num_def_acls) {
4741                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4742                         errno = EISDIR;
4743                         return False;
4744                 } else {
4745                         return True;
4746                 }
4747         }
4748
4749         if (!num_def_acls) {
4750                 /* Remove the default ACL. */
4751                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4752                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4753                                 fname, strerror(errno) ));
4754                         return False;
4755                 }
4756                 return True;
4757         }
4758
4759         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls,
4760                                                   pdata,
4761                                                   talloc_tos())) == NULL) {
4762                 return False;
4763         }
4764
4765         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4766                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4767                         fname, strerror(errno) ));
4768                 TALLOC_FREE(def_acl);
4769                 return False;
4770         }
4771
4772         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4773         TALLOC_FREE(def_acl);
4774         return True;
4775 }
4776
4777 /****************************************************************************
4778  Remove an ACL from a file. As we don't have acl_delete_entry() available
4779  we must read the current acl and copy all entries except MASK, USER and GROUP
4780  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4781  removed.
4782  FIXME ! How does the share mask/mode fit into this.... ?
4783 ****************************************************************************/
4784
4785 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4786 {
4787         SMB_ACL_T file_acl = NULL;
4788         int entry_id = SMB_ACL_FIRST_ENTRY;
4789         SMB_ACL_ENTRY_T entry;
4790         bool ret = False;
4791         /* Create a new ACL with only 3 entries, u/g/w. */
4792         SMB_ACL_T new_file_acl = sys_acl_init(talloc_tos());
4793         SMB_ACL_ENTRY_T user_ent = NULL;
4794         SMB_ACL_ENTRY_T group_ent = NULL;
4795         SMB_ACL_ENTRY_T other_ent = NULL;
4796
4797         if (new_file_acl == NULL) {
4798                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4799                 return False;
4800         }
4801
4802         /* Now create the u/g/w entries. */
4803         if (sys_acl_create_entry(&new_file_acl, &user_ent) == -1) {
4804                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4805                         fname, strerror(errno) ));
4806                 goto done;
4807         }
4808         if (sys_acl_set_tag_type(user_ent, SMB_ACL_USER_OBJ) == -1) {
4809                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4810                         fname, strerror(errno) ));
4811                 goto done;
4812         }
4813
4814         if (sys_acl_create_entry(&new_file_acl, &group_ent) == -1) {
4815                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4816                         fname, strerror(errno) ));
4817                 goto done;
4818         }
4819         if (sys_acl_set_tag_type(group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4820                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4821                         fname, strerror(errno) ));
4822                 goto done;
4823         }
4824
4825         if (sys_acl_create_entry(&new_file_acl, &other_ent) == -1) {
4826                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4827                         fname, strerror(errno) ));
4828                 goto done;
4829         }
4830         if (sys_acl_set_tag_type(other_ent, SMB_ACL_OTHER) == -1) {
4831                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4832                         fname, strerror(errno) ));
4833                 goto done;
4834         }
4835
4836         /* Get the current file ACL. */
4837         if (fsp && fsp->fh->fd != -1) {
4838                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos());
4839         } else {
4840                 file_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4841                                                     SMB_ACL_TYPE_ACCESS,
4842                                                     talloc_tos());
4843         }
4844
4845         if (file_acl == NULL) {
4846                 /* This is only returned if an error occurred. Even for a file with
4847                    no acl a u/g/w acl should be returned. */
4848                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4849                         fname, strerror(errno) ));
4850                 goto done;
4851         }
4852
4853         while ( sys_acl_get_entry(file_acl, entry_id, &entry) == 1) {
4854                 SMB_ACL_TAG_T tagtype;
4855                 SMB_ACL_PERMSET_T permset;
4856
4857                 entry_id = SMB_ACL_NEXT_ENTRY;
4858
4859                 if (sys_acl_get_tag_type(entry, &tagtype) == -1) {
4860                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4861                                 fname, strerror(errno) ));
4862                         goto done;
4863                 }
4864
4865                 if (sys_acl_get_permset(entry, &permset) == -1) {
4866                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4867                                 fname, strerror(errno) ));
4868                         goto done;
4869                 }
4870
4871                 if (tagtype == SMB_ACL_USER_OBJ) {
4872                         if (sys_acl_set_permset(user_ent, permset) == -1) {
4873                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4874                                         fname, strerror(errno) ));
4875                         }
4876                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4877                         if (sys_acl_set_permset(group_ent, permset) == -1) {
4878                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4879                                         fname, strerror(errno) ));
4880                         }
4881                 } else if (tagtype == SMB_ACL_OTHER) {
4882                         if (sys_acl_set_permset(other_ent, permset) == -1) {
4883                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4884                                         fname, strerror(errno) ));
4885                         }
4886                 }
4887         }
4888
4889         /* Set the new empty file ACL. */
4890         if (fsp && fsp->fh->fd != -1) {
4891                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4892                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4893                                 fname, strerror(errno) ));
4894                         goto done;
4895                 }
4896         } else {
4897                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4898                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4899                                 fname, strerror(errno) ));
4900                         goto done;
4901                 }
4902         }
4903
4904         ret = True;
4905
4906  done:
4907
4908         if (file_acl) {
4909                 TALLOC_FREE(file_acl);
4910         }
4911         if (new_file_acl) {
4912                 TALLOC_FREE(new_file_acl);
4913         }
4914         return ret;
4915 }
4916
4917 /****************************************************************************
4918  Calls from UNIX extensions - POSIX ACL set.
4919  If num_def_acls == 0 then read/modify/write acl after removing all entries
4920  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4921 ****************************************************************************/
4922
4923 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4924 {
4925         SMB_ACL_T file_acl = NULL;
4926
4927         if (!num_acls) {
4928                 /* Remove the ACL from the file. */
4929                 return remove_posix_acl(conn, fsp, fname);
4930         }
4931
4932         if ((file_acl = create_posix_acl_from_wire(conn, num_acls,
4933                                                    pdata,
4934                                                    talloc_tos())) == NULL) {
4935                 return False;
4936         }
4937
4938         if (fsp && fsp->fh->fd != -1) {
4939                 /* The preferred way - use an open fd. */
4940                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4941                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4942                                 fname, strerror(errno) ));
4943                         TALLOC_FREE(file_acl);
4944                         return False;
4945                 }
4946         } else {
4947                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4948                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4949                                 fname, strerror(errno) ));
4950                         TALLOC_FREE(file_acl);
4951                         return False;
4952                 }
4953         }
4954
4955         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4956         TALLOC_FREE(file_acl);
4957         return True;
4958 }
4959
4960 /********************************************************************
4961  Pull the NT ACL from a file on disk or the OpenEventlog() access
4962  check.  Caller is responsible for freeing the returned security
4963  descriptor via TALLOC_FREE().  This is designed for dealing with
4964  user space access checks in smbd outside of the VFS.  For example,
4965  checking access rights in OpenEventlog().
4966
4967  Assume we are dealing with files (for now)
4968 ********************************************************************/
4969
4970 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname, uint32 security_info_wanted)
4971 {
4972         struct security_descriptor *ret_sd;
4973         connection_struct *conn;
4974         files_struct finfo;
4975         struct fd_handle fh;
4976         NTSTATUS status;
4977         TALLOC_CTX *frame = talloc_stackframe();
4978
4979         conn = talloc_zero(frame, connection_struct);
4980         if (conn == NULL) {
4981                 DEBUG(0, ("talloc failed\n"));
4982                 return NULL;
4983         }
4984
4985         if (!(conn->params = talloc(conn, struct share_params))) {
4986                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4987                 TALLOC_FREE(frame);
4988                 return NULL;
4989         }
4990
4991         conn->params->service = -1;
4992
4993         set_conn_connectpath(conn, "/");
4994
4995         if (!smbd_vfs_init(conn)) {
4996                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4997                 conn_free(conn);
4998                 TALLOC_FREE(frame);
4999                 return NULL;
5000         }
5001
5002         ZERO_STRUCT( finfo );
5003         ZERO_STRUCT( fh );
5004
5005         finfo.fnum = FNUM_FIELD_INVALID;
5006         finfo.conn = conn;
5007         finfo.fh = &fh;
5008         finfo.fh->fd = -1;
5009
5010         status = create_synthetic_smb_fname(frame, fname, NULL, NULL,
5011                                             &finfo.fsp_name);
5012         if (!NT_STATUS_IS_OK(status)) {
5013                 conn_free(conn);
5014                 TALLOC_FREE(frame);
5015                 return NULL;
5016         }
5017
5018         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo,
5019                                                   security_info_wanted,
5020                                                   ctx, &ret_sd))) {
5021                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
5022                 TALLOC_FREE(finfo.fsp_name);
5023                 conn_free(conn);
5024                 TALLOC_FREE(frame);
5025                 return NULL;
5026         }
5027
5028         TALLOC_FREE(finfo.fsp_name);
5029         conn_free(conn);
5030         TALLOC_FREE(frame);
5031
5032         return ret_sd;
5033 }
5034
5035 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
5036
5037 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
5038                                         const char *name,
5039                                         SMB_STRUCT_STAT *psbuf,
5040                                         struct security_descriptor **ppdesc)
5041 {
5042         struct dom_sid owner_sid, group_sid;
5043         size_t size = 0;
5044         struct security_ace aces[4];
5045         uint32_t access_mask = 0;
5046         mode_t mode = psbuf->st_ex_mode;
5047         struct security_acl *new_dacl = NULL;
5048         int idx = 0;
5049
5050         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
5051                 name, (int)mode ));
5052
5053         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
5054         gid_to_sid(&group_sid, psbuf->st_ex_gid);
5055
5056         /*
5057          We provide up to 4 ACEs
5058                 - Owner
5059                 - Group
5060                 - Everyone
5061                 - NT System
5062         */
5063
5064         if (mode & S_IRUSR) {
5065                 if (mode & S_IWUSR) {
5066                         access_mask |= SEC_RIGHTS_FILE_ALL;
5067                 } else {
5068                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
5069                 }
5070         }
5071         if (mode & S_IWUSR) {
5072                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
5073         }
5074
5075         init_sec_ace(&aces[idx],
5076                         &owner_sid,
5077                         SEC_ACE_TYPE_ACCESS_ALLOWED,
5078                         access_mask,
5079                         0);
5080         idx++;
5081
5082         access_mask = 0;
5083         if (mode & S_IRGRP) {
5084                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
5085         }
5086         if (mode & S_IWGRP) {
5087                 /* note that delete is not granted - this matches posix behaviour */
5088                 access_mask |= SEC_RIGHTS_FILE_WRITE;
5089         }
5090         if (access_mask) {
5091                 init_sec_ace(&aces[idx],
5092                         &group_sid,
5093                         SEC_ACE_TYPE_ACCESS_ALLOWED,
5094                         access_mask,
5095                         0);
5096                 idx++;
5097         }
5098
5099         access_mask = 0;
5100         if (mode & S_IROTH) {
5101                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
5102         }
5103         if (mode & S_IWOTH) {
5104                 access_mask |= SEC_RIGHTS_FILE_WRITE;
5105         }
5106         if (access_mask) {
5107                 init_sec_ace(&aces[idx],
5108                         &global_sid_World,
5109                         SEC_ACE_TYPE_ACCESS_ALLOWED,
5110                         access_mask,
5111                         0);
5112                 idx++;
5113         }
5114
5115         init_sec_ace(&aces[idx],
5116                         &global_sid_System,
5117                         SEC_ACE_TYPE_ACCESS_ALLOWED,
5118                         SEC_RIGHTS_FILE_ALL,
5119                         0);
5120         idx++;
5121
5122         new_dacl = make_sec_acl(ctx,
5123                         NT4_ACL_REVISION,
5124                         idx,
5125                         aces);
5126
5127         if (!new_dacl) {
5128                 return NT_STATUS_NO_MEMORY;
5129         }
5130
5131         *ppdesc = make_sec_desc(ctx,
5132                         SECURITY_DESCRIPTOR_REVISION_1,
5133                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
5134                         &owner_sid,
5135                         &group_sid,
5136                         NULL,
5137                         new_dacl,
5138                         &size);
5139         if (!*ppdesc) {
5140                 return NT_STATUS_NO_MEMORY;
5141         }
5142         return NT_STATUS_OK;
5143 }