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_security_mask(params->service);
1274                 or_bits = lp_force_dir_security_mode(params->service);
1275         } else {
1276                 and_bits = lp_security_mask(params->service);
1277                 or_bits = lp_force_security_mode(params->service);
1278         }
1279
1280         /* Now bounce them into the S_USR space. */
1281         switch(type) {
1282         case S_IRUSR:
1283                 /* Ensure owner has read access. */
1284                 pace->perms |= S_IRUSR;
1285                 if (is_directory)
1286                         pace->perms |= (S_IWUSR|S_IXUSR);
1287                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1288                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1289                 break;
1290         case S_IRGRP:
1291                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1292                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1293                 break;
1294         case S_IROTH:
1295                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1296                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1297                 break;
1298         }
1299
1300         pace->perms = ((pace->perms & and_bits)|or_bits);
1301 }
1302
1303 /****************************************************************************
1304  Check if a given uid/SID is in a group gid/SID. This is probably very
1305  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1306 ****************************************************************************/
1307
1308 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1309 {
1310         /* "Everyone" always matches every uid. */
1311
1312         if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1313                 return True;
1314
1315         /*
1316          * if it's the current user, we already have the unix token
1317          * and don't need to do the complex user_in_group_sid() call
1318          */
1319         if (uid_ace->unix_ug.id == get_current_uid(conn)) {
1320                 const struct security_unix_token *curr_utok = NULL;
1321                 size_t i;
1322
1323                 if (group_ace->unix_ug.id == get_current_gid(conn)) {
1324                         return True;
1325                 }
1326
1327                 curr_utok = get_current_utok(conn);
1328                 for (i=0; i < curr_utok->ngroups; i++) {
1329                         if (group_ace->unix_ug.id == curr_utok->groups[i]) {
1330                                 return True;
1331                         }
1332                 }
1333         }
1334
1335         /*
1336          * user_in_group_sid() uses create_token_from_sid()
1337          * which creates an artificial NT token given just a username,
1338          * so this is not reliable for users from foreign domains
1339          * exported by winbindd!
1340          */
1341         return user_sid_in_group_sid(&uid_ace->trustee, &group_ace->trustee);
1342 }
1343
1344 /****************************************************************************
1345  A well formed POSIX file or default ACL has at least 3 entries, a
1346  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1347  In addition, the owner must always have at least read access.
1348  When using this call on get_acl, the pst struct is valid and contains
1349  the mode of the file. When using this call on set_acl, the pst struct has
1350  been modified to have a mode containing the default for this file or directory
1351  type.
1352 ****************************************************************************/
1353
1354 static bool ensure_canon_entry_valid(connection_struct *conn,
1355                                         canon_ace **pp_ace,
1356                                         const struct share_params *params,
1357                                         const bool is_directory,
1358                                         const struct dom_sid *pfile_owner_sid,
1359                                         const struct dom_sid *pfile_grp_sid,
1360                                         const SMB_STRUCT_STAT *pst,
1361                                         bool setting_acl)
1362 {
1363         canon_ace *pace;
1364         canon_ace *pace_user = NULL;
1365         canon_ace *pace_group = NULL;
1366         canon_ace *pace_other = NULL;
1367
1368         for (pace = *pp_ace; pace; pace = pace->next) {
1369                 if (pace->type == SMB_ACL_USER_OBJ) {
1370
1371                         if (setting_acl)
1372                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1373                         pace_user = pace;
1374
1375                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1376
1377                         /*
1378                          * Ensure create mask/force create mode is respected on set.
1379                          */
1380
1381                         if (setting_acl)
1382                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1383                         pace_group = pace;
1384
1385                 } else if (pace->type == SMB_ACL_OTHER) {
1386
1387                         /*
1388                          * Ensure create mask/force create mode is respected on set.
1389                          */
1390
1391                         if (setting_acl)
1392                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1393                         pace_other = pace;
1394                 }
1395         }
1396
1397         if (!pace_user) {
1398                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1399                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1400                         return False;
1401                 }
1402
1403                 ZERO_STRUCTP(pace);
1404                 pace->type = SMB_ACL_USER_OBJ;
1405                 pace->owner_type = UID_ACE;
1406                 pace->unix_ug.type = ID_TYPE_UID;
1407                 pace->unix_ug.id = pst->st_ex_uid;
1408                 pace->trustee = *pfile_owner_sid;
1409                 pace->attr = ALLOW_ACE;
1410                 /* Start with existing permissions, principle of least
1411                    surprises for the user. */
1412                 pace->perms = pst->st_ex_mode;
1413
1414                 if (setting_acl) {
1415                         /* See if the owning user is in any of the other groups in
1416                            the ACE, or if there's a matching user entry (by uid
1417                            or in the case of ID_TYPE_BOTH by SID).
1418                            If so, OR in the permissions from that entry. */
1419
1420                         canon_ace *pace_iter;
1421
1422                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1423                                 if (pace_iter->type == SMB_ACL_USER &&
1424                                                 pace_iter->unix_ug.id == pace->unix_ug.id) {
1425                                         pace->perms |= pace_iter->perms;
1426                                 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1427                                         if (dom_sid_equal(&pace->trustee, &pace_iter->trustee)) {
1428                                                 pace->perms |= pace_iter->perms;
1429                                         } else if (uid_entry_in_group(conn, pace, pace_iter)) {
1430                                                 pace->perms |= pace_iter->perms;
1431                                         }
1432                                 }
1433                         }
1434
1435                         if (pace->perms == 0) {
1436                                 /* If we only got an "everyone" perm, just use that. */
1437                                 if (pace_other)
1438                                         pace->perms = pace_other->perms;
1439                         }
1440
1441                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1442                 } else {
1443                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1444                 }
1445
1446                 DLIST_ADD(*pp_ace, pace);
1447                 pace_user = pace;
1448         }
1449
1450         if (!pace_group) {
1451                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1452                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1453                         return False;
1454                 }
1455
1456                 ZERO_STRUCTP(pace);
1457                 pace->type = SMB_ACL_GROUP_OBJ;
1458                 pace->owner_type = GID_ACE;
1459                 pace->unix_ug.type = ID_TYPE_GID;
1460                 pace->unix_ug.id = pst->st_ex_gid;
1461                 pace->trustee = *pfile_grp_sid;
1462                 pace->attr = ALLOW_ACE;
1463                 if (setting_acl) {
1464                         /* If we only got an "everyone" perm, just use that. */
1465                         if (pace_other)
1466                                 pace->perms = pace_other->perms;
1467                         else
1468                                 pace->perms = 0;
1469                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1470                 } else {
1471                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1472                 }
1473
1474                 DLIST_ADD(*pp_ace, pace);
1475                 pace_group = pace;
1476         }
1477
1478         if (!pace_other) {
1479                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1480                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1481                         return False;
1482                 }
1483
1484                 ZERO_STRUCTP(pace);
1485                 pace->type = SMB_ACL_OTHER;
1486                 pace->owner_type = WORLD_ACE;
1487                 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1488                 pace->unix_ug.id = -1;
1489                 pace->trustee = global_sid_World;
1490                 pace->attr = ALLOW_ACE;
1491                 if (setting_acl) {
1492                         pace->perms = 0;
1493                         apply_default_perms(params, is_directory, pace, S_IROTH);
1494                 } else
1495                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1496
1497                 DLIST_ADD(*pp_ace, pace);
1498                 pace_other = pace;
1499         }
1500
1501         if (setting_acl) {
1502                 /* Ensure when setting a POSIX ACL, that the uid for a
1503                    SMB_ACL_USER_OBJ ACE (the owner ACE entry) has a duplicate
1504                    permission entry as an SMB_ACL_USER, and a gid for a
1505                    SMB_ACL_GROUP_OBJ ACE (the primary group ACE entry) also has
1506                    a duplicate permission entry as an SMB_ACL_GROUP. If not,
1507                    then if the ownership or group ownership of this file or
1508                    directory gets changed, the user or group can lose their
1509                    access. */
1510                 bool got_duplicate_user = false;
1511                 bool got_duplicate_group = false;
1512
1513                 for (pace = *pp_ace; pace; pace = pace->next) {
1514                         if (pace->type == SMB_ACL_USER &&
1515                                         pace->unix_ug.id == pace_user->unix_ug.id) {
1516                                 /* Already got one. */
1517                                 got_duplicate_user = true;
1518                         } else if (pace->type == SMB_ACL_GROUP &&
1519                                         pace->unix_ug.id == pace_user->unix_ug.id) {
1520                                 /* Already got one. */
1521                                 got_duplicate_group = true;
1522                         } else if ((pace->type == SMB_ACL_GROUP)
1523                                    && (dom_sid_equal(&pace->trustee, &pace_user->trustee))) {
1524                                 /* If the SID owning the file appears
1525                                  * in a group entry, then we have
1526                                  * enough duplication, they will still
1527                                  * have access */
1528                                 got_duplicate_user = true;
1529                         }
1530                 }
1531
1532                 /* If the SID is equal for the user and group that we need
1533                    to add the duplicate for, add only the group */
1534                 if (!got_duplicate_user && !got_duplicate_group
1535                                 && dom_sid_equal(&pace_group->trustee,
1536                                                 &pace_user->trustee)) {
1537                         /* Add a duplicate SMB_ACL_GROUP entry, this
1538                          * will cover the owning SID as well, as it
1539                          * will always be mapped to both a uid and
1540                          * gid. */
1541
1542                         if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1543                                 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1544                                 return false;
1545                         }
1546
1547                         ZERO_STRUCTP(pace);
1548                         pace->type = SMB_ACL_GROUP;;
1549                         pace->owner_type = GID_ACE;
1550                         pace->unix_ug.type = ID_TYPE_GID;
1551                         pace->unix_ug.id = pace_group->unix_ug.id;
1552                         pace->trustee = pace_group->trustee;
1553                         pace->attr = pace_group->attr;
1554                         pace->perms = pace_group->perms;
1555
1556                         DLIST_ADD(*pp_ace, pace);
1557
1558                         /* We're done here, make sure the
1559                            statements below are not executed. */
1560                         got_duplicate_user = true;
1561                         got_duplicate_group = true;
1562                 }
1563
1564                 if (!got_duplicate_user) {
1565                         /* Add a duplicate SMB_ACL_USER entry. */
1566                         if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1567                                 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1568                                 return false;
1569                         }
1570
1571                         ZERO_STRUCTP(pace);
1572                         pace->type = SMB_ACL_USER;;
1573                         pace->owner_type = UID_ACE;
1574                         pace->unix_ug.type = ID_TYPE_UID;
1575                         pace->unix_ug.id = pace_user->unix_ug.id;
1576                         pace->trustee = pace_user->trustee;
1577                         pace->attr = pace_user->attr;
1578                         pace->perms = pace_user->perms;
1579
1580                         DLIST_ADD(*pp_ace, pace);
1581
1582                         got_duplicate_user = true;
1583                 }
1584
1585                 if (!got_duplicate_group) {
1586                         /* Add a duplicate SMB_ACL_GROUP entry. */
1587                         if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1588                                 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1589                                 return false;
1590                         }
1591
1592                         ZERO_STRUCTP(pace);
1593                         pace->type = SMB_ACL_GROUP;;
1594                         pace->owner_type = GID_ACE;
1595                         pace->unix_ug.type = ID_TYPE_GID;
1596                         pace->unix_ug.id = pace_group->unix_ug.id;
1597                         pace->trustee = pace_group->trustee;
1598                         pace->attr = pace_group->attr;
1599                         pace->perms = pace_group->perms;
1600
1601                         DLIST_ADD(*pp_ace, pace);
1602
1603                         got_duplicate_group = true;
1604                 }
1605
1606         }
1607
1608         return True;
1609 }
1610
1611 /****************************************************************************
1612  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1613  If it does not have them, check if there are any entries where the trustee is the
1614  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1615  Note we must not do this to default directory ACLs.
1616 ****************************************************************************/
1617
1618 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1619 {
1620         bool got_user_obj, got_group_obj;
1621         canon_ace *current_ace;
1622         int i, entries;
1623
1624         entries = count_canon_ace_list(ace);
1625         got_user_obj = False;
1626         got_group_obj = False;
1627
1628         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1629                 if (current_ace->type == SMB_ACL_USER_OBJ)
1630                         got_user_obj = True;
1631                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1632                         got_group_obj = True;
1633         }
1634         if (got_user_obj && got_group_obj) {
1635                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1636                 return;
1637         }
1638
1639         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1640                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1641                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1642                         current_ace->type = SMB_ACL_USER_OBJ;
1643                         got_user_obj = True;
1644                 }
1645                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1646                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1647                         current_ace->type = SMB_ACL_GROUP_OBJ;
1648                         got_group_obj = True;
1649                 }
1650         }
1651         if (!got_user_obj)
1652                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1653         if (!got_group_obj)
1654                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1655 }
1656
1657 static bool add_current_ace_to_acl(files_struct *fsp, struct security_ace *psa,
1658                                    canon_ace **file_ace, canon_ace **dir_ace,
1659                                    bool *got_file_allow, bool *got_dir_allow,
1660                                    bool *all_aces_are_inherit_only,
1661                                    canon_ace *current_ace)
1662 {
1663
1664         /*
1665          * Map the given NT permissions into a UNIX mode_t containing only
1666          * S_I(R|W|X)USR bits.
1667          */
1668
1669         current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1670         current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1671
1672         /* Store the ace_flag. */
1673         current_ace->ace_flags = psa->flags;
1674
1675         /*
1676          * Now add the created ace to either the file list, the directory
1677          * list, or both. We *MUST* preserve the order here (hence we use
1678          * DLIST_ADD_END) as NT ACLs are order dependent.
1679          */
1680
1681         if (fsp->is_directory) {
1682
1683                 /*
1684                  * We can only add to the default POSIX ACE list if the ACE is
1685                  * designed to be inherited by both files and directories.
1686                  */
1687
1688                 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1689                     (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1690
1691                         canon_ace *current_dir_ace = current_ace;
1692                         DLIST_ADD_END(*dir_ace, current_ace, canon_ace *);
1693
1694                         /*
1695                          * Note if this was an allow ace. We can't process
1696                          * any further deny ace's after this.
1697                          */
1698
1699                         if (current_ace->attr == ALLOW_ACE)
1700                                 *got_dir_allow = True;
1701
1702                         if ((current_ace->attr == DENY_ACE) && *got_dir_allow) {
1703                                 DEBUG(0,("add_current_ace_to_acl: "
1704                                          "malformed ACL in "
1705                                          "inheritable ACL! Deny entry "
1706                                          "after Allow entry. Failing "
1707                                          "to set on file %s.\n",
1708                                          fsp_str_dbg(fsp)));
1709                                 return False;
1710                         }
1711
1712                         if( DEBUGLVL( 10 )) {
1713                                 dbgtext("add_current_ace_to_acl: adding dir ACL:\n");
1714                                 print_canon_ace( current_ace, 0);
1715                         }
1716
1717                         /*
1718                          * If this is not an inherit only ACE we need to add a duplicate
1719                          * to the file acl.
1720                          */
1721
1722                         if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1723                                 canon_ace *dup_ace = dup_canon_ace(current_ace);
1724
1725                                 if (!dup_ace) {
1726                                         DEBUG(0,("add_current_ace_to_acl: malloc fail !\n"));
1727                                         return False;
1728                                 }
1729
1730                                 /*
1731                                  * We must not free current_ace here as its
1732                                  * pointer is now owned by the dir_ace list.
1733                                  */
1734                                 current_ace = dup_ace;
1735                                 /* We've essentially split this ace into two,
1736                                  * and added the ace with inheritance request
1737                                  * bits to the directory ACL. Drop those bits for
1738                                  * the ACE we're adding to the file list. */
1739                                 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1740                                                             SEC_ACE_FLAG_CONTAINER_INHERIT|
1741                                                             SEC_ACE_FLAG_INHERIT_ONLY);
1742                         } else {
1743                                 /*
1744                                  * We must not free current_ace here as its
1745                                  * pointer is now owned by the dir_ace list.
1746                                  */
1747                                 current_ace = NULL;
1748                         }
1749
1750                         /*
1751                          * current_ace is now either owned by file_ace
1752                          * or is NULL. We can safely operate on current_dir_ace
1753                          * to treat mapping for default acl entries differently
1754                          * than access acl entries.
1755                          */
1756
1757                         if (current_dir_ace->owner_type == UID_ACE) {
1758                                 /*
1759                                  * We already decided above this is a uid,
1760                                  * for default acls ace's only CREATOR_OWNER
1761                                  * maps to ACL_USER_OBJ. All other uid
1762                                  * ace's are ACL_USER.
1763                                  */
1764                                 if (dom_sid_equal(&current_dir_ace->trustee,
1765                                                   &global_sid_Creator_Owner)) {
1766                                         current_dir_ace->type = SMB_ACL_USER_OBJ;
1767                                 } else {
1768                                         current_dir_ace->type = SMB_ACL_USER;
1769                                 }
1770                         }
1771
1772                         if (current_dir_ace->owner_type == GID_ACE) {
1773                                 /*
1774                                  * We already decided above this is a gid,
1775                                  * for default acls ace's only CREATOR_GROUP
1776                                  * maps to ACL_GROUP_OBJ. All other uid
1777                                  * ace's are ACL_GROUP.
1778                                  */
1779                                 if (dom_sid_equal(&current_dir_ace->trustee,
1780                                                   &global_sid_Creator_Group)) {
1781                                         current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1782                                 } else {
1783                                         current_dir_ace->type = SMB_ACL_GROUP;
1784                                 }
1785                         }
1786                 }
1787         }
1788
1789         /*
1790          * Only add to the file ACL if not inherit only.
1791          */
1792
1793         if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1794                 DLIST_ADD_END(*file_ace, current_ace, canon_ace *);
1795
1796                 /*
1797                  * Note if this was an allow ace. We can't process
1798                  * any further deny ace's after this.
1799                  */
1800
1801                 if (current_ace->attr == ALLOW_ACE)
1802                         *got_file_allow = True;
1803
1804                 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1805                         DEBUG(0,("add_current_ace_to_acl: malformed "
1806                                  "ACL in file ACL ! Deny entry after "
1807                                  "Allow entry. Failing to set on file "
1808                                  "%s.\n", fsp_str_dbg(fsp)));
1809                         return False;
1810                 }
1811
1812                 if( DEBUGLVL( 10 )) {
1813                         dbgtext("add_current_ace_to_acl: adding file ACL:\n");
1814                         print_canon_ace( current_ace, 0);
1815                 }
1816                 *all_aces_are_inherit_only = False;
1817                 /*
1818                  * We must not free current_ace here as its
1819                  * pointer is now owned by the file_ace list.
1820                  */
1821                 current_ace = NULL;
1822         }
1823
1824         /*
1825          * Free if ACE was not added.
1826          */
1827
1828         TALLOC_FREE(current_ace);
1829         return true;
1830 }
1831
1832 /****************************************************************************
1833  Unpack a struct security_descriptor into two canonical ace lists.
1834 ****************************************************************************/
1835
1836 static bool create_canon_ace_lists(files_struct *fsp,
1837                                         const SMB_STRUCT_STAT *pst,
1838                                         struct dom_sid *pfile_owner_sid,
1839                                         struct dom_sid *pfile_grp_sid,
1840                                         canon_ace **ppfile_ace,
1841                                         canon_ace **ppdir_ace,
1842                                         const struct security_acl *dacl)
1843 {
1844         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1845         canon_ace *file_ace = NULL;
1846         canon_ace *dir_ace = NULL;
1847         canon_ace *current_ace = NULL;
1848         bool got_dir_allow = False;
1849         bool got_file_allow = False;
1850         int i, j;
1851
1852         *ppfile_ace = NULL;
1853         *ppdir_ace = NULL;
1854
1855         /*
1856          * Convert the incoming ACL into a more regular form.
1857          */
1858
1859         for(i = 0; i < dacl->num_aces; i++) {
1860                 struct security_ace *psa = &dacl->aces[i];
1861
1862                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1863                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1864                         return False;
1865                 }
1866
1867                 if (nt4_compatible_acls()) {
1868                         /*
1869                          * The security mask may be UNIX_ACCESS_NONE which should map into
1870                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1871                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1872                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1873                          */
1874
1875                         /*
1876                          * Convert GENERIC bits to specific bits.
1877                          */
1878
1879                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1880
1881                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1882
1883                         if(psa->access_mask != UNIX_ACCESS_NONE)
1884                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1885                 }
1886         }
1887
1888         /*
1889          * Deal with the fact that NT 4.x re-writes the canonical format
1890          * that we return for default ACLs. If a directory ACE is identical
1891          * to a inherited directory ACE then NT changes the bits so that the
1892          * first ACE is set to OI|IO and the second ACE for this SID is set
1893          * to CI. We need to repair this. JRA.
1894          */
1895
1896         for(i = 0; i < dacl->num_aces; i++) {
1897                 struct security_ace *psa1 = &dacl->aces[i];
1898
1899                 for (j = i + 1; j < dacl->num_aces; j++) {
1900                         struct security_ace *psa2 = &dacl->aces[j];
1901
1902                         if (psa1->access_mask != psa2->access_mask)
1903                                 continue;
1904
1905                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1906                                 continue;
1907
1908                         /*
1909                          * Ok - permission bits and SIDs are equal.
1910                          * Check if flags were re-written.
1911                          */
1912
1913                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1914
1915                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1916                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1917
1918                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1919
1920                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1921                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1922
1923                         }
1924                 }
1925         }
1926
1927         for(i = 0; i < dacl->num_aces; i++) {
1928                 struct security_ace *psa = &dacl->aces[i];
1929
1930                 /*
1931                  * Create a canon_ace entry representing this NT DACL ACE.
1932                  */
1933
1934                 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1935                         free_canon_ace_list(file_ace);
1936                         free_canon_ace_list(dir_ace);
1937                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1938                         return False;
1939                 }
1940
1941                 ZERO_STRUCTP(current_ace);
1942
1943                 sid_copy(&current_ace->trustee, &psa->trustee);
1944
1945                 /*
1946                  * Try and work out if the SID is a user or group
1947                  * as we need to flag these differently for POSIX.
1948                  * Note what kind of a POSIX ACL this should map to.
1949                  */
1950
1951                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1952                         current_ace->owner_type = WORLD_ACE;
1953                         current_ace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1954                         current_ace->unix_ug.id = -1;
1955                         current_ace->type = SMB_ACL_OTHER;
1956                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1957                         current_ace->owner_type = UID_ACE;
1958                         current_ace->unix_ug.type = ID_TYPE_UID;
1959                         current_ace->unix_ug.id = pst->st_ex_uid;
1960                         current_ace->type = SMB_ACL_USER_OBJ;
1961
1962                         /*
1963                          * The Creator Owner entry only specifies inheritable permissions,
1964                          * never access permissions. WinNT doesn't always set the ACE to
1965                          * INHERIT_ONLY, though.
1966                          */
1967
1968                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1969
1970                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1971                         current_ace->owner_type = GID_ACE;
1972                         current_ace->unix_ug.type = ID_TYPE_GID;
1973                         current_ace->unix_ug.id = pst->st_ex_gid;
1974                         current_ace->type = SMB_ACL_GROUP_OBJ;
1975
1976                         /*
1977                          * The Creator Group entry only specifies inheritable permissions,
1978                          * never access permissions. WinNT doesn't always set the ACE to
1979                          * INHERIT_ONLY, though.
1980                          */
1981                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1982
1983                 } else {
1984                         struct unixid unixid;
1985
1986                         if (!sids_to_unixids(&current_ace->trustee, 1, &unixid)) {
1987                                 free_canon_ace_list(file_ace);
1988                                 free_canon_ace_list(dir_ace);
1989                                 TALLOC_FREE(current_ace);
1990                                 DEBUG(0, ("create_canon_ace_lists: sids_to_unixids "
1991                                         "failed for %s (allocation failure)\n",
1992                                         sid_string_dbg(&current_ace->trustee)));
1993                                 return false;
1994                         }
1995
1996                         if (unixid.type == ID_TYPE_BOTH) {
1997                                 /* If it's the owning user, this is a
1998                                  * user_obj, not a user.  This way, we
1999                                  * get a valid ACL for groups that own
2000                                  * files, without putting user ACL
2001                                  * entries in for groups otherwise */
2002                                 if (unixid.id == pst->st_ex_uid) {
2003                                         current_ace->owner_type = UID_ACE;
2004                                         current_ace->unix_ug.type = ID_TYPE_UID;
2005                                         current_ace->unix_ug.id = unixid.id;
2006                                         current_ace->type = SMB_ACL_USER_OBJ;
2007
2008                                         /* Add the user object to the posix ACL,
2009                                            and proceed to the group mapping
2010                                            below. This handles the talloc_free
2011                                            of current_ace if not added for some
2012                                            reason */
2013                                         if (!add_current_ace_to_acl(fsp,
2014                                                         psa,
2015                                                         &file_ace,
2016                                                         &dir_ace,
2017                                                         &got_file_allow,
2018                                                         &got_dir_allow,
2019                                                         &all_aces_are_inherit_only,
2020                                                         current_ace)) {
2021                                                 free_canon_ace_list(file_ace);
2022                                                 free_canon_ace_list(dir_ace);
2023                                                 return false;
2024                                         }
2025
2026                                         if ((current_ace = talloc(talloc_tos(),
2027                                                         canon_ace)) == NULL) {
2028                                                 free_canon_ace_list(file_ace);
2029                                                 free_canon_ace_list(dir_ace);
2030                                                 DEBUG(0,("create_canon_ace_lists: "
2031                                                         "malloc fail.\n"));
2032                                                 return False;
2033                                         }
2034
2035                                         ZERO_STRUCTP(current_ace);
2036                                 }
2037
2038                                 sid_copy(&current_ace->trustee, &psa->trustee);
2039
2040                                 current_ace->unix_ug.type = ID_TYPE_GID;
2041                                 current_ace->unix_ug.id = unixid.id;
2042                                 current_ace->owner_type = GID_ACE;
2043                                 /* If it's the primary group, this is a
2044                                    group_obj, not a group. */
2045                                 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2046                                         current_ace->type = SMB_ACL_GROUP_OBJ;
2047                                 } else {
2048                                         current_ace->type = SMB_ACL_GROUP;
2049                                 }
2050
2051                         } else if (unixid.type == ID_TYPE_UID) {
2052                                 current_ace->owner_type = UID_ACE;
2053                                 current_ace->unix_ug.type = ID_TYPE_UID;
2054                                 current_ace->unix_ug.id = unixid.id;
2055                                 /* If it's the owning user, this is a user_obj,
2056                                    not a user. */
2057                                 if (current_ace->unix_ug.id == pst->st_ex_uid) {
2058                                         current_ace->type = SMB_ACL_USER_OBJ;
2059                                 } else {
2060                                         current_ace->type = SMB_ACL_USER;
2061                                 }
2062                         } else if (unixid.type == ID_TYPE_GID) {
2063                                 current_ace->unix_ug.type = ID_TYPE_GID;
2064                                 current_ace->unix_ug.id = unixid.id;
2065                                 current_ace->owner_type = GID_ACE;
2066                                 /* If it's the primary group, this is a
2067                                    group_obj, not a group. */
2068                                 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2069                                         current_ace->type = SMB_ACL_GROUP_OBJ;
2070                                 } else {
2071                                         current_ace->type = SMB_ACL_GROUP;
2072                                 }
2073                         } else {
2074                                 /*
2075                                  * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
2076                                  */
2077
2078                                 if (non_mappable_sid(&psa->trustee)) {
2079                                         DEBUG(10, ("create_canon_ace_lists: ignoring "
2080                                                    "non-mappable SID %s\n",
2081                                                    sid_string_dbg(&psa->trustee)));
2082                                         TALLOC_FREE(current_ace);
2083                                         continue;
2084                                 }
2085
2086                                 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
2087                                         DEBUG(10, ("create_canon_ace_lists: ignoring "
2088                                                 "unknown or foreign SID %s\n",
2089                                                 sid_string_dbg(&psa->trustee)));
2090                                         TALLOC_FREE(current_ace);
2091                                         continue;
2092                                 }
2093
2094                                 free_canon_ace_list(file_ace);
2095                                 free_canon_ace_list(dir_ace);
2096                                 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
2097                                           "%s to uid or gid.\n",
2098                                           sid_string_dbg(&current_ace->trustee)));
2099                                 TALLOC_FREE(current_ace);
2100                                 return false;
2101                         }
2102                 }
2103
2104                 /* handles the talloc_free of current_ace if not added for some reason */
2105                 if (!add_current_ace_to_acl(fsp, psa, &file_ace, &dir_ace,
2106                                             &got_file_allow, &got_dir_allow,
2107                                             &all_aces_are_inherit_only, current_ace)) {
2108                         free_canon_ace_list(file_ace);
2109                         free_canon_ace_list(dir_ace);
2110                         return false;
2111                 }
2112         }
2113
2114         if (fsp->is_directory && all_aces_are_inherit_only) {
2115                 /*
2116                  * Windows 2000 is doing one of these weird 'inherit acl'
2117                  * traverses to conserve NTFS ACL resources. Just pretend
2118                  * there was no DACL sent. JRA.
2119                  */
2120
2121                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
2122                 free_canon_ace_list(file_ace);
2123                 free_canon_ace_list(dir_ace);
2124                 file_ace = NULL;
2125                 dir_ace = NULL;
2126         } else {
2127                 /*
2128                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
2129                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
2130                  * entries can be converted to *_OBJ. Don't do this for the default
2131                  * ACL, we will create them separately for this if needed inside
2132                  * ensure_canon_entry_valid().
2133                  */
2134                 if (file_ace) {
2135                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
2136                 }
2137         }
2138
2139         *ppfile_ace = file_ace;
2140         *ppdir_ace = dir_ace;
2141
2142         return True;
2143 }
2144
2145 /****************************************************************************
2146  ASCII art time again... JRA :-).
2147
2148  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2149  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2150  entries). Secondly, the merge code has ensured that all duplicate SID entries for
2151  allow or deny have been merged, so the same SID can only appear once in the deny
2152  list or once in the allow list.
2153
2154  We then process as follows :
2155
2156  ---------------------------------------------------------------------------
2157  First pass - look for a Everyone DENY entry.
2158
2159  If it is deny all (rwx) trunate the list at this point.
2160  Else, walk the list from this point and use the deny permissions of this
2161  entry as a mask on all following allow entries. Finally, delete
2162  the Everyone DENY entry (we have applied it to everything possible).
2163
2164  In addition, in this pass we remove any DENY entries that have
2165  no permissions (ie. they are a DENY nothing).
2166  ---------------------------------------------------------------------------
2167  Second pass - only deal with deny user entries.
2168
2169  DENY user1 (perms XXX)
2170
2171  new_perms = 0
2172  for all following allow group entries where user1 is in group
2173         new_perms |= group_perms;
2174
2175  user1 entry perms = new_perms & ~ XXX;
2176
2177  Convert the deny entry to an allow entry with the new perms and
2178  push to the end of the list. Note if the user was in no groups
2179  this maps to a specific allow nothing entry for this user.
2180
2181  The common case from the NT ACL choser (userX deny all) is
2182  optimised so we don't do the group lookup - we just map to
2183  an allow nothing entry.
2184
2185  What we're doing here is inferring the allow permissions the
2186  person setting the ACE on user1 wanted by looking at the allow
2187  permissions on the groups the user is currently in. This will
2188  be a snapshot, depending on group membership but is the best
2189  we can do and has the advantage of failing closed rather than
2190  open.
2191  ---------------------------------------------------------------------------
2192  Third pass - only deal with deny group entries.
2193
2194  DENY group1 (perms XXX)
2195
2196  for all following allow user entries where user is in group1
2197    user entry perms = user entry perms & ~ XXX;
2198
2199  If there is a group Everyone allow entry with permissions YYY,
2200  convert the group1 entry to an allow entry and modify its
2201  permissions to be :
2202
2203  new_perms = YYY & ~ XXX
2204
2205  and push to the end of the list.
2206
2207  If there is no group Everyone allow entry then convert the
2208  group1 entry to a allow nothing entry and push to the end of the list.
2209
2210  Note that the common case from the NT ACL choser (groupX deny all)
2211  cannot be optimised here as we need to modify user entries who are
2212  in the group to change them to a deny all also.
2213
2214  What we're doing here is modifying the allow permissions of
2215  user entries (which are more specific in POSIX ACLs) to mask
2216  out the explicit deny set on the group they are in. This will
2217  be a snapshot depending on current group membership but is the
2218  best we can do and has the advantage of failing closed rather
2219  than open.
2220  ---------------------------------------------------------------------------
2221  Fourth pass - cope with cumulative permissions.
2222
2223  for all allow user entries, if there exists an allow group entry with
2224  more permissive permissions, and the user is in that group, rewrite the
2225  allow user permissions to contain both sets of permissions.
2226
2227  Currently the code for this is #ifdef'ed out as these semantics make
2228  no sense to me. JRA.
2229  ---------------------------------------------------------------------------
2230
2231  Note we *MUST* do the deny user pass first as this will convert deny user
2232  entries into allow user entries which can then be processed by the deny
2233  group pass.
2234
2235  The above algorithm took a *lot* of thinking about - hence this
2236  explaination :-). JRA.
2237 ****************************************************************************/
2238
2239 /****************************************************************************
2240  Process a canon_ace list entries. This is very complex code. We need
2241  to go through and remove the "deny" permissions from any allow entry that matches
2242  the id of this entry. We have already refused any NT ACL that wasn't in correct
2243  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2244  we just remove it (to fail safe). We have already removed any duplicate ace
2245  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2246  allow entries.
2247 ****************************************************************************/
2248
2249 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2250 {
2251         canon_ace *ace_list = *pp_ace_list;
2252         canon_ace *curr_ace = NULL;
2253         canon_ace *curr_ace_next = NULL;
2254
2255         /* Pass 1 above - look for an Everyone, deny entry. */
2256
2257         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2258                 canon_ace *allow_ace_p;
2259
2260                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2261
2262                 if (curr_ace->attr != DENY_ACE)
2263                         continue;
2264
2265                 if (curr_ace->perms == (mode_t)0) {
2266
2267                         /* Deny nothing entry - delete. */
2268
2269                         DLIST_REMOVE(ace_list, curr_ace);
2270                         continue;
2271                 }
2272
2273                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2274                         continue;
2275
2276                 /* JRATEST - assert. */
2277                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2278
2279                 if (curr_ace->perms == ALL_ACE_PERMS) {
2280
2281                         /*
2282                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2283                          * list at this point including this entry.
2284                          */
2285
2286                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2287
2288                         free_canon_ace_list( curr_ace );
2289                         if (prev_entry)
2290                                 DLIST_REMOVE(ace_list, prev_entry);
2291                         else {
2292                                 /* We deleted the entire list. */
2293                                 ace_list = NULL;
2294                         }
2295                         break;
2296                 }
2297
2298                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2299
2300                         /*
2301                          * Only mask off allow entries.
2302                          */
2303
2304                         if (allow_ace_p->attr != ALLOW_ACE)
2305                                 continue;
2306
2307                         allow_ace_p->perms &= ~curr_ace->perms;
2308                 }
2309
2310                 /*
2311                  * Now it's been applied, remove it.
2312                  */
2313
2314                 DLIST_REMOVE(ace_list, curr_ace);
2315         }
2316
2317         /* Pass 2 above - deal with deny user entries. */
2318
2319         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2320                 mode_t new_perms = (mode_t)0;
2321                 canon_ace *allow_ace_p;
2322
2323                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2324
2325                 if (curr_ace->attr != DENY_ACE)
2326                         continue;
2327
2328                 if (curr_ace->owner_type != UID_ACE)
2329                         continue;
2330
2331                 if (curr_ace->perms == ALL_ACE_PERMS) {
2332
2333                         /*
2334                          * Optimisation - this is a deny everything to this user.
2335                          * Convert to an allow nothing and push to the end of the list.
2336                          */
2337
2338                         curr_ace->attr = ALLOW_ACE;
2339                         curr_ace->perms = (mode_t)0;
2340                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2341                         continue;
2342                 }
2343
2344                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2345
2346                         if (allow_ace_p->attr != ALLOW_ACE)
2347                                 continue;
2348
2349                         /* We process GID_ACE and WORLD_ACE entries only. */
2350
2351                         if (allow_ace_p->owner_type == UID_ACE)
2352                                 continue;
2353
2354                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2355                                 new_perms |= allow_ace_p->perms;
2356                 }
2357
2358                 /*
2359                  * Convert to a allow entry, modify the perms and push to the end
2360                  * of the list.
2361                  */
2362
2363                 curr_ace->attr = ALLOW_ACE;
2364                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2365                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2366         }
2367
2368         /* Pass 3 above - deal with deny group entries. */
2369
2370         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2371                 canon_ace *allow_ace_p;
2372                 canon_ace *allow_everyone_p = NULL;
2373
2374                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2375
2376                 if (curr_ace->attr != DENY_ACE)
2377                         continue;
2378
2379                 if (curr_ace->owner_type != GID_ACE)
2380                         continue;
2381
2382                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2383
2384                         if (allow_ace_p->attr != ALLOW_ACE)
2385                                 continue;
2386
2387                         /* Store a pointer to the Everyone allow, if it exists. */
2388                         if (allow_ace_p->owner_type == WORLD_ACE)
2389                                 allow_everyone_p = allow_ace_p;
2390
2391                         /* We process UID_ACE entries only. */
2392
2393                         if (allow_ace_p->owner_type != UID_ACE)
2394                                 continue;
2395
2396                         /* Mask off the deny group perms. */
2397
2398                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2399                                 allow_ace_p->perms &= ~curr_ace->perms;
2400                 }
2401
2402                 /*
2403                  * Convert the deny to an allow with the correct perms and
2404                  * push to the end of the list.
2405                  */
2406
2407                 curr_ace->attr = ALLOW_ACE;
2408                 if (allow_everyone_p)
2409                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2410                 else
2411                         curr_ace->perms = (mode_t)0;
2412                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2413         }
2414
2415         /* Doing this fourth pass allows Windows semantics to be layered
2416          * on top of POSIX semantics. I'm not sure if this is desirable.
2417          * For example, in W2K ACLs there is no way to say, "Group X no
2418          * access, user Y full access" if user Y is a member of group X.
2419          * This seems completely broken semantics to me.... JRA.
2420          */
2421
2422 #if 0
2423         /* Pass 4 above - deal with allow entries. */
2424
2425         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2426                 canon_ace *allow_ace_p;
2427
2428                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2429
2430                 if (curr_ace->attr != ALLOW_ACE)
2431                         continue;
2432
2433                 if (curr_ace->owner_type != UID_ACE)
2434                         continue;
2435
2436                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2437
2438                         if (allow_ace_p->attr != ALLOW_ACE)
2439                                 continue;
2440
2441                         /* We process GID_ACE entries only. */
2442
2443                         if (allow_ace_p->owner_type != GID_ACE)
2444                                 continue;
2445
2446                         /* OR in the group perms. */
2447
2448                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2449                                 curr_ace->perms |= allow_ace_p->perms;
2450                 }
2451         }
2452 #endif
2453
2454         *pp_ace_list = ace_list;
2455 }
2456
2457 /****************************************************************************
2458  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2459  succeeding.
2460 ****************************************************************************/
2461
2462 static bool unpack_canon_ace(files_struct *fsp,
2463                                 const SMB_STRUCT_STAT *pst,
2464                                 struct dom_sid *pfile_owner_sid,
2465                                 struct dom_sid *pfile_grp_sid,
2466                                 canon_ace **ppfile_ace,
2467                                 canon_ace **ppdir_ace,
2468                                 uint32 security_info_sent,
2469                                 const struct security_descriptor *psd)
2470 {
2471         canon_ace *file_ace = NULL;
2472         canon_ace *dir_ace = NULL;
2473
2474         *ppfile_ace = NULL;
2475         *ppdir_ace = NULL;
2476
2477         if(security_info_sent == 0) {
2478                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2479                 return False;
2480         }
2481
2482         /*
2483          * If no DACL then this is a chown only security descriptor.
2484          */
2485
2486         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2487                 return True;
2488
2489         /*
2490          * Now go through the DACL and create the canon_ace lists.
2491          */
2492
2493         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2494                                                                 &file_ace, &dir_ace, psd->dacl))
2495                 return False;
2496
2497         if ((file_ace == NULL) && (dir_ace == NULL)) {
2498                 /* W2K traverse DACL set - ignore. */
2499                 return True;
2500         }
2501
2502         /*
2503          * Go through the canon_ace list and merge entries
2504          * belonging to identical users of identical allow or deny type.
2505          * We can do this as all deny entries come first, followed by
2506          * all allow entries (we have mandated this before accepting this acl).
2507          */
2508
2509         print_canon_ace_list( "file ace - before merge", file_ace);
2510         merge_aces( &file_ace, false);
2511
2512         print_canon_ace_list( "dir ace - before merge", dir_ace);
2513         merge_aces( &dir_ace, true);
2514
2515         /*
2516          * NT ACLs are order dependent. Go through the acl lists and
2517          * process DENY entries by masking the allow entries.
2518          */
2519
2520         print_canon_ace_list( "file ace - before deny", file_ace);
2521         process_deny_list(fsp->conn, &file_ace);
2522
2523         print_canon_ace_list( "dir ace - before deny", dir_ace);
2524         process_deny_list(fsp->conn, &dir_ace);
2525
2526         /*
2527          * A well formed POSIX file or default ACL has at least 3 entries, a
2528          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2529          * and optionally a mask entry. Ensure this is the case.
2530          */
2531
2532         print_canon_ace_list( "file ace - before valid", file_ace);
2533
2534         if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2535                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2536                 free_canon_ace_list(file_ace);
2537                 free_canon_ace_list(dir_ace);
2538                 return False;
2539         }
2540
2541         print_canon_ace_list( "dir ace - before valid", dir_ace);
2542
2543         if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2544                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2545                 free_canon_ace_list(file_ace);
2546                 free_canon_ace_list(dir_ace);
2547                 return False;
2548         }
2549
2550         print_canon_ace_list( "file ace - return", file_ace);
2551         print_canon_ace_list( "dir ace - return", dir_ace);
2552
2553         *ppfile_ace = file_ace;
2554         *ppdir_ace = dir_ace;
2555         return True;
2556
2557 }
2558
2559 /******************************************************************************
2560  When returning permissions, try and fit NT display
2561  semantics if possible. Note the the canon_entries here must have been malloced.
2562  The list format should be - first entry = owner, followed by group and other user
2563  entries, last entry = other.
2564
2565  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2566  are not ordered, and match on the most specific entry rather than walking a list,
2567  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2568
2569  Entry 0: owner : deny all except read and write.
2570  Entry 1: owner : allow read and write.
2571  Entry 2: group : deny all except read.
2572  Entry 3: group : allow read.
2573  Entry 4: Everyone : allow read.
2574
2575  But NT cannot display this in their ACL editor !
2576 ********************************************************************************/
2577
2578 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2579 {
2580         canon_ace *l_head = *pp_list_head;
2581         canon_ace *owner_ace = NULL;
2582         canon_ace *other_ace = NULL;
2583         canon_ace *ace = NULL;
2584
2585         for (ace = l_head; ace; ace = ace->next) {
2586                 if (ace->type == SMB_ACL_USER_OBJ)
2587                         owner_ace = ace;
2588                 else if (ace->type == SMB_ACL_OTHER) {
2589                         /* Last ace - this is "other" */
2590                         other_ace = ace;
2591                 }
2592         }
2593
2594         if (!owner_ace || !other_ace) {
2595                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2596                         filename ));
2597                 return;
2598         }
2599
2600         /*
2601          * The POSIX algorithm applies to owner first, and other last,
2602          * so ensure they are arranged in this order.
2603          */
2604
2605         if (owner_ace) {
2606                 DLIST_PROMOTE(l_head, owner_ace);
2607         }
2608
2609         if (other_ace) {
2610                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2611         }
2612
2613         /* We have probably changed the head of the list. */
2614
2615         *pp_list_head = l_head;
2616 }
2617
2618 /****************************************************************************
2619  Create a linked list of canonical ACE entries.
2620 ****************************************************************************/
2621
2622 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2623                                    const char *fname, SMB_ACL_T posix_acl,
2624                                    const SMB_STRUCT_STAT *psbuf,
2625                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2626 {
2627         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2628         canon_ace *l_head = NULL;
2629         canon_ace *ace = NULL;
2630         canon_ace *next_ace = NULL;
2631         int entry_id = SMB_ACL_FIRST_ENTRY;
2632         bool is_default_acl = (the_acl_type == SMB_ACL_TYPE_DEFAULT);
2633         SMB_ACL_ENTRY_T entry;
2634         size_t ace_count;
2635
2636         while ( posix_acl && (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1)) {
2637                 SMB_ACL_TAG_T tagtype;
2638                 SMB_ACL_PERMSET_T permset;
2639                 struct dom_sid sid;
2640                 struct unixid unix_ug;
2641                 enum ace_owner owner_type;
2642
2643                 entry_id = SMB_ACL_NEXT_ENTRY;
2644
2645                 /* Is this a MASK entry ? */
2646                 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
2647                         continue;
2648
2649                 if (sys_acl_get_permset(entry, &permset) == -1)
2650                         continue;
2651
2652                 /* Decide which SID to use based on the ACL type. */
2653                 switch(tagtype) {
2654                         case SMB_ACL_USER_OBJ:
2655                                 /* Get the SID from the owner. */
2656                                 sid_copy(&sid, powner);
2657                                 unix_ug.type = ID_TYPE_UID;
2658                                 unix_ug.id = psbuf->st_ex_uid;
2659                                 owner_type = UID_ACE;
2660                                 break;
2661                         case SMB_ACL_USER:
2662                                 {
2663                                         uid_t *puid = (uid_t *)sys_acl_get_qualifier(entry);
2664                                         if (puid == NULL) {
2665                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2666                                                 continue;
2667                                         }
2668                                         uid_to_sid( &sid, *puid);
2669                                         unix_ug.type = ID_TYPE_UID;
2670                                         unix_ug.id = *puid;
2671                                         owner_type = UID_ACE;
2672                                         break;
2673                                 }
2674                         case SMB_ACL_GROUP_OBJ:
2675                                 /* Get the SID from the owning group. */
2676                                 sid_copy(&sid, pgroup);
2677                                 unix_ug.type = ID_TYPE_GID;
2678                                 unix_ug.id = psbuf->st_ex_gid;
2679                                 owner_type = GID_ACE;
2680                                 break;
2681                         case SMB_ACL_GROUP:
2682                                 {
2683                                         gid_t *pgid = (gid_t *)sys_acl_get_qualifier(entry);
2684                                         if (pgid == NULL) {
2685                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2686                                                 continue;
2687                                         }
2688                                         gid_to_sid( &sid, *pgid);
2689                                         unix_ug.type = ID_TYPE_GID;
2690                                         unix_ug.id = *pgid;
2691                                         owner_type = GID_ACE;
2692                                         break;
2693                                 }
2694                         case SMB_ACL_MASK:
2695                                 acl_mask = convert_permset_to_mode_t(permset);
2696                                 continue; /* Don't count the mask as an entry. */
2697                         case SMB_ACL_OTHER:
2698                                 /* Use the Everyone SID */
2699                                 sid = global_sid_World;
2700                                 unix_ug.type = ID_TYPE_NOT_SPECIFIED;
2701                                 unix_ug.id = -1;
2702                                 owner_type = WORLD_ACE;
2703                                 break;
2704                         default:
2705                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2706                                 continue;
2707                 }
2708
2709                 /*
2710                  * Add this entry to the list.
2711                  */
2712
2713                 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2714                         goto fail;
2715
2716                 ZERO_STRUCTP(ace);
2717                 ace->type = tagtype;
2718                 ace->perms = convert_permset_to_mode_t(permset);
2719                 ace->attr = ALLOW_ACE;
2720                 ace->trustee = sid;
2721                 ace->unix_ug = unix_ug;
2722                 ace->owner_type = owner_type;
2723                 ace->ace_flags = get_pai_flags(pal, ace, is_default_acl);
2724
2725                 DLIST_ADD(l_head, ace);
2726         }
2727
2728         /*
2729          * This next call will ensure we have at least a user/group/world set.
2730          */
2731
2732         if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2733                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2734                                       psbuf, False))
2735                 goto fail;
2736
2737         /*
2738          * Now go through the list, masking the permissions with the
2739          * acl_mask. Ensure all DENY Entries are at the start of the list.
2740          */
2741
2742         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", is_default_acl ?  "Default" : "Access"));
2743
2744         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2745                 next_ace = ace->next;
2746
2747                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2748                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2749                         ace->perms &= acl_mask;
2750
2751                 if (ace->perms == 0) {
2752                         DLIST_PROMOTE(l_head, ace);
2753                 }
2754
2755                 if( DEBUGLVL( 10 ) ) {
2756                         print_canon_ace(ace, ace_count);
2757                 }
2758         }
2759
2760         arrange_posix_perms(fname,&l_head );
2761
2762         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2763
2764         return l_head;
2765
2766   fail:
2767
2768         free_canon_ace_list(l_head);
2769         return NULL;
2770 }
2771
2772 /****************************************************************************
2773  Check if the current user group list contains a given group.
2774 ****************************************************************************/
2775
2776 bool current_user_in_group(connection_struct *conn, gid_t gid)
2777 {
2778         int i;
2779         const struct security_unix_token *utok = get_current_utok(conn);
2780
2781         for (i = 0; i < utok->ngroups; i++) {
2782                 if (utok->groups[i] == gid) {
2783                         return True;
2784                 }
2785         }
2786
2787         return False;
2788 }
2789
2790 /****************************************************************************
2791  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2792 ****************************************************************************/
2793
2794 static bool acl_group_override(connection_struct *conn,
2795                                const struct smb_filename *smb_fname)
2796 {
2797         if ((errno != EPERM) && (errno != EACCES)) {
2798                 return false;
2799         }
2800
2801         /* file primary group == user primary or supplementary group */
2802         if (lp_acl_group_control(SNUM(conn)) &&
2803             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2804                 return true;
2805         }
2806
2807         /* user has writeable permission */
2808         if (lp_dos_filemode(SNUM(conn)) &&
2809             can_write_to_file(conn, smb_fname)) {
2810                 return true;
2811         }
2812
2813         return false;
2814 }
2815
2816 /****************************************************************************
2817  Attempt to apply an ACL to a file or directory.
2818 ****************************************************************************/
2819
2820 static bool set_canon_ace_list(files_struct *fsp,
2821                                 canon_ace *the_ace,
2822                                 bool default_ace,
2823                                 const SMB_STRUCT_STAT *psbuf,
2824                                 bool *pacl_set_support)
2825 {
2826         connection_struct *conn = fsp->conn;
2827         bool ret = False;
2828         SMB_ACL_T the_acl = sys_acl_init();
2829         canon_ace *p_ace;
2830         int i;
2831         SMB_ACL_ENTRY_T mask_entry;
2832         bool got_mask_entry = False;
2833         SMB_ACL_PERMSET_T mask_permset;
2834         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2835         bool needs_mask = False;
2836         mode_t mask_perms = 0;
2837
2838         /* Use the psbuf that was passed in. */
2839         if (psbuf != &fsp->fsp_name->st) {
2840                 fsp->fsp_name->st = *psbuf;
2841         }
2842
2843 #if defined(POSIX_ACL_NEEDS_MASK)
2844         /* HP-UX always wants to have a mask (called "class" there). */
2845         needs_mask = True;
2846 #endif
2847
2848         if (the_acl == NULL) {
2849                 DEBUG(0, ("sys_acl_init failed to allocate an ACL\n"));
2850                 return false;
2851         }
2852
2853         if( DEBUGLVL( 10 )) {
2854                 dbgtext("set_canon_ace_list: setting ACL:\n");
2855                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2856                         print_canon_ace( p_ace, i);
2857                 }
2858         }
2859
2860         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2861                 SMB_ACL_ENTRY_T the_entry;
2862                 SMB_ACL_PERMSET_T the_permset;
2863
2864                 /*
2865                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2866                  * named group entries. But if there is an ACL_MASK entry, it applies
2867                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2868                  * so that it doesn't deny (i.e., mask off) any permissions.
2869                  */
2870
2871                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2872                         needs_mask = True;
2873                         mask_perms |= p_ace->perms;
2874                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2875                         mask_perms |= p_ace->perms;
2876                 }
2877
2878                 /*
2879                  * Get the entry for this ACE.
2880                  */
2881
2882                 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
2883                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2884                                 i, strerror(errno) ));
2885                         goto fail;
2886                 }
2887
2888                 if (p_ace->type == SMB_ACL_MASK) {
2889                         mask_entry = the_entry;
2890                         got_mask_entry = True;
2891                 }
2892
2893                 /*
2894                  * Ok - we now know the ACL calls should be working, don't
2895                  * allow fallback to chmod.
2896                  */
2897
2898                 *pacl_set_support = True;
2899
2900                 /*
2901                  * Initialise the entry from the canon_ace.
2902                  */
2903
2904                 /*
2905                  * First tell the entry what type of ACE this is.
2906                  */
2907
2908                 if (sys_acl_set_tag_type(the_entry, p_ace->type) == -1) {
2909                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2910                                 i, strerror(errno) ));
2911                         goto fail;
2912                 }
2913
2914                 /*
2915                  * Only set the qualifier (user or group id) if the entry is a user
2916                  * or group id ACE.
2917                  */
2918
2919                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2920                         if (sys_acl_set_qualifier(the_entry,(void *)&p_ace->unix_ug.id) == -1) {
2921                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2922                                         i, strerror(errno) ));
2923                                 goto fail;
2924                         }
2925                 }
2926
2927                 /*
2928                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2929                  */
2930
2931                 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
2932                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2933                                 i, strerror(errno) ));
2934                         goto fail;
2935                 }
2936
2937                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2938                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2939                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2940                         goto fail;
2941                 }
2942
2943                 /*
2944                  * ..and apply them to the entry.
2945                  */
2946
2947                 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
2948                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2949                                 i, strerror(errno) ));
2950                         goto fail;
2951                 }
2952
2953                 if( DEBUGLVL( 10 ))
2954                         print_canon_ace( p_ace, i);
2955
2956         }
2957
2958         if (needs_mask && !got_mask_entry) {
2959                 if (sys_acl_create_entry(&the_acl, &mask_entry) == -1) {
2960                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2961                         goto fail;
2962                 }
2963
2964                 if (sys_acl_set_tag_type(mask_entry, SMB_ACL_MASK) == -1) {
2965                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2966                         goto fail;
2967                 }
2968
2969                 if (sys_acl_get_permset(mask_entry, &mask_permset) == -1) {
2970                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2971                         goto fail;
2972                 }
2973
2974                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2975                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2976                         goto fail;
2977                 }
2978
2979                 if (sys_acl_set_permset(mask_entry, mask_permset) == -1) {
2980                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2981                         goto fail;
2982                 }
2983         }
2984
2985         /*
2986          * Finally apply it to the file or directory.
2987          */
2988
2989         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2990                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2991                                              the_acl_type, the_acl) == -1) {
2992                         /*
2993                          * Some systems allow all the above calls and only fail with no ACL support
2994                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2995                          */
2996                         if (no_acl_syscall_error(errno)) {
2997                                 *pacl_set_support = False;
2998                         }
2999
3000                         if (acl_group_override(conn, fsp->fsp_name)) {
3001                                 int sret;
3002
3003                                 DEBUG(5,("set_canon_ace_list: acl group "
3004                                          "control on and current user in file "
3005                                          "%s primary group.\n",
3006                                          fsp_str_dbg(fsp)));
3007
3008                                 become_root();
3009                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
3010                                     fsp->fsp_name->base_name, the_acl_type,
3011                                     the_acl);
3012                                 unbecome_root();
3013                                 if (sret == 0) {
3014                                         ret = True;
3015                                 }
3016                         }
3017
3018                         if (ret == False) {
3019                                 DEBUG(2,("set_canon_ace_list: "
3020                                          "sys_acl_set_file type %s failed for "
3021                                          "file %s (%s).\n",
3022                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
3023                                          "directory default" : "file",
3024                                          fsp_str_dbg(fsp), strerror(errno)));
3025                                 goto fail;
3026                         }
3027                 }
3028         } else {
3029                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
3030                         /*
3031                          * Some systems allow all the above calls and only fail with no ACL support
3032                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3033                          */
3034                         if (no_acl_syscall_error(errno)) {
3035                                 *pacl_set_support = False;
3036                         }
3037
3038                         if (acl_group_override(conn, fsp->fsp_name)) {
3039                                 int sret;
3040
3041                                 DEBUG(5,("set_canon_ace_list: acl group "
3042                                          "control on and current user in file "
3043                                          "%s primary group.\n",
3044                                          fsp_str_dbg(fsp)));
3045
3046                                 become_root();
3047                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
3048                                 unbecome_root();
3049                                 if (sret == 0) {
3050                                         ret = True;
3051                                 }
3052                         }
3053
3054                         if (ret == False) {
3055                                 DEBUG(2,("set_canon_ace_list: "
3056                                          "sys_acl_set_file failed for file %s "
3057                                          "(%s).\n",
3058                                          fsp_str_dbg(fsp), strerror(errno)));
3059                                 goto fail;
3060                         }
3061                 }
3062         }
3063
3064         ret = True;
3065
3066   fail:
3067
3068         if (the_acl != NULL) {
3069                 TALLOC_FREE(the_acl);
3070         }
3071
3072         return ret;
3073 }
3074
3075 /****************************************************************************
3076  Find a particular canon_ace entry.
3077 ****************************************************************************/
3078
3079 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, struct unixid *id)
3080 {
3081         while (list) {
3082                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
3083                                 (type == SMB_ACL_USER  && id && id->id == list->unix_ug.id) ||
3084                                 (type == SMB_ACL_GROUP && id && id->id == list->unix_ug.id)))
3085                         break;
3086                 list = list->next;
3087         }
3088         return list;
3089 }
3090
3091 /****************************************************************************
3092
3093 ****************************************************************************/
3094
3095 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
3096 {
3097         SMB_ACL_ENTRY_T entry;
3098
3099         if (!the_acl)
3100                 return NULL;
3101         if (sys_acl_get_entry(the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
3102                 TALLOC_FREE(the_acl);
3103                 return NULL;
3104         }
3105         return the_acl;
3106 }
3107
3108 /****************************************************************************
3109  Convert a canon_ace to a generic 3 element permission - if possible.
3110 ****************************************************************************/
3111
3112 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3113
3114 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3115 {
3116         int snum = SNUM(fsp->conn);
3117         size_t ace_count = count_canon_ace_list(file_ace_list);
3118         canon_ace *ace_p;
3119         canon_ace *owner_ace = NULL;
3120         canon_ace *group_ace = NULL;
3121         canon_ace *other_ace = NULL;
3122         mode_t and_bits;
3123         mode_t or_bits;
3124
3125         if (ace_count != 3) {
3126                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3127                          "entries for file %s to convert to posix perms.\n",
3128                          fsp_str_dbg(fsp)));
3129                 return False;
3130         }
3131
3132         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3133                 if (ace_p->owner_type == UID_ACE)
3134                         owner_ace = ace_p;
3135                 else if (ace_p->owner_type == GID_ACE)
3136                         group_ace = ace_p;
3137                 else if (ace_p->owner_type == WORLD_ACE)
3138                         other_ace = ace_p;
3139         }
3140
3141         if (!owner_ace || !group_ace || !other_ace) {
3142                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3143                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3144                 return False;
3145         }
3146
3147         *posix_perms = (mode_t)0;
3148
3149         *posix_perms |= owner_ace->perms;
3150         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3151         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3152         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3153         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3154         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3155         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3156
3157         /* The owner must have at least read access. */
3158
3159         *posix_perms |= S_IRUSR;
3160         if (fsp->is_directory)
3161                 *posix_perms |= (S_IWUSR|S_IXUSR);
3162
3163         /* If requested apply the masks. */
3164
3165         /* Get the initial bits to apply. */
3166
3167         if (fsp->is_directory) {
3168                 and_bits = lp_dir_security_mask(snum);
3169                 or_bits = lp_force_dir_security_mode(snum);
3170         } else {
3171                 and_bits = lp_security_mask(snum);
3172                 or_bits = lp_force_security_mode(snum);
3173         }
3174
3175         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3176
3177         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3178                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3179                   (int)group_ace->perms, (int)other_ace->perms,
3180                   (int)*posix_perms, fsp_str_dbg(fsp)));
3181
3182         return True;
3183 }
3184
3185 /****************************************************************************
3186   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3187   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3188   with CI|OI set so it is inherited and also applies to the directory.
3189   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3190 ****************************************************************************/
3191
3192 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3193 {
3194         size_t i, j;
3195
3196         for (i = 0; i < num_aces; i++) {
3197                 for (j = i+1; j < num_aces; j++) {
3198                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3199                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3200                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3201                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3202
3203                         /* We know the lower number ACE's are file entries. */
3204                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3205                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3206                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3207                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3208                                 (i_inh == j_inh) &&
3209                                 (i_flags_ni == 0) &&
3210                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3211                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3212                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3213                                 /*
3214                                  * W2K wants to have access allowed zero access ACE's
3215                                  * at the end of the list. If the mask is zero, merge
3216                                  * the non-inherited ACE onto the inherited ACE.
3217                                  */
3218
3219                                 if (nt_ace_list[i].access_mask == 0) {
3220                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3221                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3222                                         if (num_aces - i - 1 > 0)
3223                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3224                                                                 sizeof(struct security_ace));
3225
3226                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3227                                                 (unsigned int)i, (unsigned int)j ));
3228                                 } else {
3229                                         /*
3230                                          * These are identical except for the flags.
3231                                          * Merge the inherited ACE onto the non-inherited ACE.
3232                                          */
3233
3234                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3235                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3236                                         if (num_aces - j - 1 > 0)
3237                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3238                                                                 sizeof(struct security_ace));
3239
3240                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3241                                                 (unsigned int)j, (unsigned int)i ));
3242                                 }
3243                                 num_aces--;
3244                                 break;
3245                         }
3246                 }
3247         }
3248
3249         return num_aces;
3250 }
3251
3252 /*
3253  * Add or Replace ACE entry.
3254  * In some cases we need to add a specific ACE for compatibility reasons.
3255  * When doing that we must make sure we are not actually creating a duplicate
3256  * entry. So we need to search whether an ACE entry already exist and eventually
3257  * replacce the access mask, or add a completely new entry if none was found.
3258  *
3259  * This function assumes the array has enough space to add a new entry without
3260  * any reallocation of memory.
3261  */
3262
3263 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3264                                 const struct dom_sid *sid, enum security_ace_type type,
3265                                 uint32_t mask, uint8_t flags)
3266 {
3267         int i;
3268
3269         /* first search for a duplicate */
3270         for (i = 0; i < *num_aces; i++) {
3271                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3272                     (nt_ace_list[i].flags == flags)) break;
3273         }
3274
3275         if (i < *num_aces) { /* found */
3276                 nt_ace_list[i].type = type;
3277                 nt_ace_list[i].access_mask = mask;
3278                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3279                            i, sid_string_dbg(sid), flags));
3280                 return;
3281         }
3282
3283         /* not found, append it */
3284         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3285 }
3286
3287
3288 /****************************************************************************
3289  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3290  the space for the return elements and returns the size needed to return the
3291  security descriptor. This should be the only external function needed for
3292  the UNIX style get ACL.
3293 ****************************************************************************/
3294
3295 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3296                                       const char *name,
3297                                       const SMB_STRUCT_STAT *sbuf,
3298                                       struct pai_val *pal,
3299                                       SMB_ACL_T posix_acl,
3300                                       SMB_ACL_T def_acl,
3301                                       uint32_t security_info,
3302                                       struct security_descriptor **ppdesc)
3303 {
3304         struct dom_sid owner_sid;
3305         struct dom_sid group_sid;
3306         size_t sd_size = 0;
3307         struct security_acl *psa = NULL;
3308         size_t num_acls = 0;
3309         size_t num_def_acls = 0;
3310         size_t num_aces = 0;
3311         canon_ace *file_ace = NULL;
3312         canon_ace *dir_ace = NULL;
3313         struct security_ace *nt_ace_list = NULL;
3314         size_t num_profile_acls = 0;
3315         struct dom_sid orig_owner_sid;
3316         struct security_descriptor *psd = NULL;
3317         int i;
3318
3319         /*
3320          * Get the owner, group and world SIDs.
3321          */
3322
3323         create_file_sids(sbuf, &owner_sid, &group_sid);
3324
3325         if (lp_profile_acls(SNUM(conn))) {
3326                 /* For WXP SP1 the owner must be administrators. */
3327                 sid_copy(&orig_owner_sid, &owner_sid);
3328                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3329                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3330                 num_profile_acls = 3;
3331         }
3332
3333         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3334
3335                 /*
3336                  * In the optimum case Creator Owner and Creator Group would be used for
3337                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3338                  * would lead to usability problems under Windows: The Creator entries
3339                  * are only available in browse lists of directories and not for files;
3340                  * additionally the identity of the owning group couldn't be determined.
3341                  * We therefore use those identities only for Default ACLs.
3342                  */
3343
3344                 /* Create the canon_ace lists. */
3345                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3346                                             &owner_sid, &group_sid, pal,
3347                                             SMB_ACL_TYPE_ACCESS);
3348
3349                 /* We must have *some* ACLS. */
3350
3351                 if (count_canon_ace_list(file_ace) == 0) {
3352                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3353                         goto done;
3354                 }
3355
3356                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3357                         dir_ace = canonicalise_acl(conn, name, def_acl,
3358                                                    sbuf,
3359                                                    &global_sid_Creator_Owner,
3360                                                    &global_sid_Creator_Group,
3361                                                    pal, SMB_ACL_TYPE_DEFAULT);
3362                 }
3363
3364                 /*
3365                  * Create the NT ACE list from the canonical ace lists.
3366                  */
3367
3368                 {
3369                         canon_ace *ace;
3370                         enum security_ace_type nt_acl_type;
3371
3372                         if (nt4_compatible_acls() && dir_ace) {
3373                                 /*
3374                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3375                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3376                                  * remove entries from the Access ACL if the
3377                                  * corresponding Default ACL entries have also been
3378                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3379                                  * are exceptions. We can do nothing
3380                                  * intelligent if the Default ACL contains entries that
3381                                  * are not also contained in the Access ACL, so this
3382                                  * case will still fail under NT 4.
3383                                  */
3384
3385                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3386                                 if (ace && !ace->perms) {
3387                                         DLIST_REMOVE(dir_ace, ace);
3388                                         TALLOC_FREE(ace);
3389
3390                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3391                                         if (ace && !ace->perms) {
3392                                                 DLIST_REMOVE(file_ace, ace);
3393                                                 TALLOC_FREE(ace);
3394                                         }
3395                                 }
3396
3397                                 /*
3398                                  * WinNT doesn't usually have Creator Group
3399                                  * in browse lists, so we send this entry to
3400                                  * WinNT even if it contains no relevant
3401                                  * permissions. Once we can add
3402                                  * Creator Group to browse lists we can
3403                                  * re-enable this.
3404                                  */
3405
3406 #if 0
3407                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3408                                 if (ace && !ace->perms) {
3409                                         DLIST_REMOVE(dir_ace, ace);
3410                                         TALLOC_FREE(ace);
3411                                 }
3412 #endif
3413
3414                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3415                                 if (ace && !ace->perms) {
3416                                         DLIST_REMOVE(file_ace, ace);
3417                                         TALLOC_FREE(ace);
3418                                 }
3419                         }
3420
3421                         num_acls = count_canon_ace_list(file_ace);
3422                         num_def_acls = count_canon_ace_list(dir_ace);
3423
3424                         /* Allocate the ace list. */
3425                         if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3426                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3427                                 goto done;
3428                         }
3429
3430                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3431
3432                         /*
3433                          * Create the NT ACE list from the canonical ace lists.
3434                          */
3435
3436                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3437                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3438                                                 &nt_acl_type,
3439                                                 ace->perms,
3440                                                 S_ISDIR(sbuf->st_ex_mode));
3441                                 init_sec_ace(&nt_ace_list[num_aces++],
3442                                         &ace->trustee,
3443                                         nt_acl_type,
3444                                         acc,
3445                                         ace->ace_flags);
3446                         }
3447
3448                         /* The User must have access to a profile share - even
3449                          * if we can't map the SID. */
3450                         if (lp_profile_acls(SNUM(conn))) {
3451                                 add_or_replace_ace(nt_ace_list, &num_aces,
3452                                                    &global_sid_Builtin_Users,
3453                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3454                                                    FILE_GENERIC_ALL, 0);
3455                         }
3456
3457                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3458                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3459                                                 &nt_acl_type,
3460                                                 ace->perms,
3461                                                 S_ISDIR(sbuf->st_ex_mode));
3462                                 init_sec_ace(&nt_ace_list[num_aces++],
3463                                         &ace->trustee,
3464                                         nt_acl_type,
3465                                         acc,
3466                                         ace->ace_flags |
3467                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3468                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3469                                         SEC_ACE_FLAG_INHERIT_ONLY);
3470                         }
3471
3472                         /* The User must have access to a profile share - even
3473                          * if we can't map the SID. */
3474                         if (lp_profile_acls(SNUM(conn))) {
3475                                 add_or_replace_ace(nt_ace_list, &num_aces,
3476                                                 &global_sid_Builtin_Users,
3477                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3478                                                 FILE_GENERIC_ALL,
3479                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3480                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3481                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3482                         }
3483
3484                         /*
3485                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3486                          * Win2K needs this to get the inheritance correct when replacing ACLs
3487                          * on a directory tree. Based on work by Jim @ IBM.
3488                          */
3489
3490                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3491
3492                         if (lp_profile_acls(SNUM(conn))) {
3493                                 for (i = 0; i < num_aces; i++) {
3494                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3495                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3496                                                                    &orig_owner_sid,
3497                                                                    nt_ace_list[i].type,
3498                                                                    nt_ace_list[i].access_mask,
3499                                                                    nt_ace_list[i].flags);
3500                                                 break;
3501                                         }
3502                                 }
3503                         }
3504                 }
3505
3506                 if (num_aces) {
3507                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3508                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3509                                 goto done;
3510                         }
3511                 }
3512         } /* security_info & SECINFO_DACL */
3513
3514         psd = make_standard_sec_desc( talloc_tos(),
3515                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3516                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3517                         psa,
3518                         &sd_size);
3519
3520         if(!psd) {
3521                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3522                 sd_size = 0;
3523                 goto done;
3524         }
3525
3526         /*
3527          * Windows 2000: The DACL_PROTECTED flag in the security
3528          * descriptor marks the ACL as non-inheriting, i.e., no
3529          * ACEs from higher level directories propagate to this
3530          * ACL. In the POSIX ACL model permissions are only
3531          * inherited at file create time, so ACLs never contain
3532          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3533          * flag doesn't seem to bother Windows NT.
3534          * Always set this if map acl inherit is turned off.
3535          */
3536         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3537                 psd->type |= SEC_DESC_DACL_PROTECTED;
3538         } else {
3539                 psd->type |= pal->sd_type;
3540         }
3541
3542         if (psd->dacl) {
3543                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3544         }
3545
3546         *ppdesc = psd;
3547
3548  done:
3549
3550         if (posix_acl) {
3551                 TALLOC_FREE(posix_acl);
3552         }
3553         if (def_acl) {
3554                 TALLOC_FREE(def_acl);
3555         }
3556         free_canon_ace_list(file_ace);
3557         free_canon_ace_list(dir_ace);
3558         free_inherited_info(pal);
3559         TALLOC_FREE(nt_ace_list);
3560
3561         return NT_STATUS_OK;
3562 }
3563
3564 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3565                            struct security_descriptor **ppdesc)
3566 {
3567         SMB_STRUCT_STAT sbuf;
3568         SMB_ACL_T posix_acl = NULL;
3569         struct pai_val *pal;
3570
3571         *ppdesc = NULL;
3572
3573         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3574                   fsp_str_dbg(fsp)));
3575
3576         /* can it happen that fsp_name == NULL ? */
3577         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3578                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3579                                         security_info, ppdesc);
3580         }
3581
3582         /* Get the stat struct for the owner info. */
3583         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3584                 return map_nt_error_from_unix(errno);
3585         }
3586
3587         /* Get the ACL from the fd. */
3588         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3589
3590         pal = fload_inherited_info(fsp);
3591
3592         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3593                                        &sbuf, pal, posix_acl, NULL,
3594                                        security_info, ppdesc);
3595 }
3596
3597 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3598                           uint32_t security_info, struct security_descriptor **ppdesc)
3599 {
3600         SMB_ACL_T posix_acl = NULL;
3601         SMB_ACL_T def_acl = NULL;
3602         struct pai_val *pal;
3603         struct smb_filename smb_fname;
3604         int ret;
3605
3606         *ppdesc = NULL;
3607
3608         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3609
3610         ZERO_STRUCT(smb_fname);
3611         smb_fname.base_name = discard_const_p(char, name);
3612
3613         /* Get the stat struct for the owner info. */
3614         if (lp_posix_pathnames()) {
3615                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3616         } else {
3617                 ret = SMB_VFS_STAT(conn, &smb_fname);
3618         }
3619
3620         if (ret == -1) {
3621                 return map_nt_error_from_unix(errno);
3622         }
3623
3624         /* Get the ACL from the path. */
3625         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3626
3627         /* If it's a directory get the default POSIX ACL. */
3628         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3629                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3630                 def_acl = free_empty_sys_acl(conn, def_acl);
3631         }
3632
3633         pal = load_inherited_info(conn, name);
3634
3635         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3636                                        posix_acl, def_acl, security_info,
3637                                        ppdesc);
3638 }
3639
3640 /****************************************************************************
3641  Try to chown a file. We will be able to chown it under the following conditions.
3642
3643   1) If we have root privileges, then it will just work.
3644   2) If we have SeRestorePrivilege we can change the user + group to any other user.
3645   3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3646   4) If we have write permission to the file and dos_filemodes is set
3647      then allow chown to the currently authenticated user.
3648 ****************************************************************************/
3649
3650 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3651 {
3652         NTSTATUS status;
3653
3654         if(!CAN_WRITE(fsp->conn)) {
3655                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3656         }
3657
3658         /* Case (1). */
3659         status = vfs_chown_fsp(fsp, uid, gid);
3660         if (NT_STATUS_IS_OK(status)) {
3661                 return status;
3662         }
3663
3664         /* Case (2) / (3) */
3665         if (lp_enable_privileges()) {
3666                 bool has_take_ownership_priv = security_token_has_privilege(
3667                                                 get_current_nttok(fsp->conn),
3668                                                 SEC_PRIV_TAKE_OWNERSHIP);
3669                 bool has_restore_priv = security_token_has_privilege(
3670                                                 get_current_nttok(fsp->conn),
3671                                                 SEC_PRIV_RESTORE);
3672
3673                 if (has_restore_priv) {
3674                         ; /* Case (2) */
3675                 } else if (has_take_ownership_priv) {
3676                         /* Case (3) */
3677                         if (uid == get_current_uid(fsp->conn)) {
3678                                 gid = (gid_t)-1;
3679                         } else {
3680                                 has_take_ownership_priv = false;
3681                         }
3682                 }
3683
3684                 if (has_take_ownership_priv || has_restore_priv) {
3685                         become_root();
3686                         status = vfs_chown_fsp(fsp, uid, gid);
3687                         unbecome_root();
3688                         return status;
3689                 }
3690         }
3691
3692         /* Case (4). */
3693         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3694                 return NT_STATUS_ACCESS_DENIED;
3695         }
3696
3697         /* only allow chown to the current user. This is more secure,
3698            and also copes with the case where the SID in a take ownership ACL is
3699            a local SID on the users workstation
3700         */
3701         if (uid != get_current_uid(fsp->conn)) {
3702                 return NT_STATUS_ACCESS_DENIED;
3703         }
3704
3705         become_root();
3706         /* Keep the current file gid the same. */
3707         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3708         unbecome_root();
3709
3710         return status;
3711 }
3712
3713 #if 0
3714 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3715
3716 /****************************************************************************
3717  Take care of parent ACL inheritance.
3718 ****************************************************************************/
3719
3720 NTSTATUS append_parent_acl(files_struct *fsp,
3721                                 const struct security_descriptor *pcsd,
3722                                 struct security_descriptor **pp_new_sd)
3723 {
3724         struct smb_filename *smb_dname = NULL;
3725         struct security_descriptor *parent_sd = NULL;
3726         files_struct *parent_fsp = NULL;
3727         TALLOC_CTX *mem_ctx = talloc_tos();
3728         char *parent_name = NULL;
3729         struct security_ace *new_ace = NULL;
3730         unsigned int num_aces = pcsd->dacl->num_aces;
3731         NTSTATUS status;
3732         int info;
3733         unsigned int i, j;
3734         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3735         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3736
3737         if (psd == NULL) {
3738                 return NT_STATUS_NO_MEMORY;
3739         }
3740
3741         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3742                             NULL)) {
3743                 return NT_STATUS_NO_MEMORY;
3744         }
3745
3746         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3747                                             &smb_dname);
3748         if (!NT_STATUS_IS_OK(status)) {
3749                 goto fail;
3750         }
3751
3752         status = SMB_VFS_CREATE_FILE(
3753                 fsp->conn,                              /* conn */
3754                 NULL,                                   /* req */
3755                 0,                                      /* root_dir_fid */
3756                 smb_dname,                              /* fname */
3757                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3758                 FILE_SHARE_NONE,                        /* share_access */
3759                 FILE_OPEN,                              /* create_disposition*/
3760                 FILE_DIRECTORY_FILE,                    /* create_options */
3761                 0,                                      /* file_attributes */
3762                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3763                 0,                                      /* allocation_size */
3764                 NULL,                                   /* sd */
3765                 NULL,                                   /* ea_list */
3766                 &parent_fsp,                            /* result */
3767                 &info);                                 /* pinfo */
3768
3769         if (!NT_STATUS_IS_OK(status)) {
3770                 TALLOC_FREE(smb_dname);
3771                 return status;
3772         }
3773
3774         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3775                                     SECINFO_DACL, &parent_sd );
3776
3777         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3778         TALLOC_FREE(smb_dname);
3779
3780         if (!NT_STATUS_IS_OK(status)) {
3781                 return status;
3782         }
3783
3784         /*
3785          * Make room for potentially all the ACLs from
3786          * the parent. We used to add the ugw triple here,
3787          * as we knew we were dealing with POSIX ACLs.
3788          * We no longer need to do so as we can guarentee
3789          * that a default ACL from the parent directory will
3790          * be well formed for POSIX ACLs if it came from a
3791          * POSIX ACL source, and if we're not writing to a
3792          * POSIX ACL sink then we don't care if it's not well
3793          * formed. JRA.
3794          */
3795
3796         num_aces += parent_sd->dacl->num_aces;
3797
3798         if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3799                                         num_aces)) == NULL) {
3800                 return NT_STATUS_NO_MEMORY;
3801         }
3802
3803         /* Start by copying in all the given ACE entries. */
3804         for (i = 0; i < psd->dacl->num_aces; i++) {
3805                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3806         }
3807
3808         /*
3809          * Note that we're ignoring "inherit permissions" here
3810          * as that really only applies to newly created files. JRA.
3811          */
3812
3813         /* Finally append any inherited ACEs. */
3814         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3815                 struct security_ace *se = &parent_sd->dacl->aces[j];
3816
3817                 if (fsp->is_directory) {
3818                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3819                                 /* Doesn't apply to a directory - ignore. */
3820                                 DEBUG(10,("append_parent_acl: directory %s "
3821                                         "ignoring non container "
3822                                         "inherit flags %u on ACE with sid %s "
3823                                         "from parent %s\n",
3824                                         fsp_str_dbg(fsp),
3825                                         (unsigned int)se->flags,
3826                                         sid_string_dbg(&se->trustee),
3827                                         parent_name));
3828                                 continue;
3829                         }
3830                 } else {
3831                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3832                                 /* Doesn't apply to a file - ignore. */
3833                                 DEBUG(10,("append_parent_acl: file %s "
3834                                         "ignoring non object "
3835                                         "inherit flags %u on ACE with sid %s "
3836                                         "from parent %s\n",
3837                                         fsp_str_dbg(fsp),
3838                                         (unsigned int)se->flags,
3839                                         sid_string_dbg(&se->trustee),
3840                                         parent_name));
3841                                 continue;
3842                         }
3843                 }
3844
3845                 if (is_dacl_protected) {
3846                         /* If the DACL is protected it means we must
3847                          * not overwrite an existing ACE entry with the
3848                          * same SID. This is order N^2. Ouch :-(. JRA. */
3849                         unsigned int k;
3850                         for (k = 0; k < psd->dacl->num_aces; k++) {
3851                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3852                                                 &se->trustee)) {
3853                                         break;
3854                                 }
3855                         }
3856                         if (k < psd->dacl->num_aces) {
3857                                 /* SID matched. Ignore. */
3858                                 DEBUG(10,("append_parent_acl: path %s "
3859                                         "ignoring ACE with protected sid %s "
3860                                         "from parent %s\n",
3861                                         fsp_str_dbg(fsp),
3862                                         sid_string_dbg(&se->trustee),
3863                                         parent_name));
3864                                 continue;
3865                         }
3866                 }
3867
3868                 sec_ace_copy(&new_ace[i], se);
3869                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3870                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3871                 }
3872                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3873
3874                 if (fsp->is_directory) {
3875                         /*
3876                          * Strip off any inherit only. It's applied.
3877                          */
3878                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3879                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3880                                 /* No further inheritance. */
3881                                 new_ace[i].flags &=
3882                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3883                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3884                         }
3885                 } else {
3886                         /*
3887                          * Strip off any container or inherit
3888                          * flags, they can't apply to objects.
3889                          */
3890                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3891                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3892                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3893                 }
3894                 i++;
3895
3896                 DEBUG(10,("append_parent_acl: path %s "
3897                         "inheriting ACE with sid %s "
3898                         "from parent %s\n",
3899                         fsp_str_dbg(fsp),
3900                         sid_string_dbg(&se->trustee),
3901                         parent_name));
3902         }
3903
3904         psd->dacl->aces = new_ace;
3905         psd->dacl->num_aces = i;
3906         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3907                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
3908
3909         *pp_new_sd = psd;
3910         return status;
3911 }
3912 #endif
3913
3914 /****************************************************************************
3915  Reply to set a security descriptor on an fsp. security_info_sent is the
3916  description of the following NT ACL.
3917  This should be the only external function needed for the UNIX style set ACL.
3918  We make a copy of psd_orig as internal functions modify the elements inside
3919  it, even though it's a const pointer.
3920 ****************************************************************************/
3921
3922 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3923 {
3924         connection_struct *conn = fsp->conn;
3925         uid_t user = (uid_t)-1;
3926         gid_t grp = (gid_t)-1;
3927         struct dom_sid file_owner_sid;
3928         struct dom_sid file_grp_sid;
3929         canon_ace *file_ace_list = NULL;
3930         canon_ace *dir_ace_list = NULL;
3931         bool acl_perms = False;
3932         mode_t orig_mode = (mode_t)0;
3933         NTSTATUS status;
3934         bool set_acl_as_root = false;
3935         bool acl_set_support = false;
3936         bool ret = false;
3937         struct security_descriptor *psd = NULL;
3938
3939         DEBUG(10,("set_nt_acl: called for file %s\n",
3940                   fsp_str_dbg(fsp)));
3941
3942         if (!CAN_WRITE(conn)) {
3943                 DEBUG(10,("set acl rejected on read-only share\n"));
3944                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3945         }
3946
3947         if (!psd_orig) {
3948                 return NT_STATUS_INVALID_PARAMETER;
3949         }
3950
3951         psd = dup_sec_desc(talloc_tos(), psd_orig);
3952         if (!psd) {
3953                 return NT_STATUS_NO_MEMORY;
3954         }
3955
3956         /*
3957          * Get the current state of the file.
3958          */
3959
3960         status = vfs_stat_fsp(fsp);
3961         if (!NT_STATUS_IS_OK(status)) {
3962                 return status;
3963         }
3964
3965         /* Save the original element we check against. */
3966         orig_mode = fsp->fsp_name->st.st_ex_mode;
3967
3968         /*
3969          * Unpack the user/group/world id's.
3970          */
3971
3972         /* POSIX can't cope with missing owner/group. */
3973         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3974                 security_info_sent &= ~SECINFO_OWNER;
3975         }
3976         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3977                 security_info_sent &= ~SECINFO_GROUP;
3978         }
3979
3980         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3981         if (!NT_STATUS_IS_OK(status)) {
3982                 return status;
3983         }
3984
3985         /*
3986          * Do we need to chown ? If so this must be done first as the incoming
3987          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3988          * Noticed by Simo.
3989          */
3990
3991         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3992             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3993
3994                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3995                          fsp_str_dbg(fsp), (unsigned int)user,
3996                          (unsigned int)grp));
3997
3998                 status = try_chown(fsp, user, grp);
3999                 if(!NT_STATUS_IS_OK(status)) {
4000                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
4001                                 "= %s.\n", fsp_str_dbg(fsp),
4002                                 (unsigned int)user,
4003                                 (unsigned int)grp,
4004                                 nt_errstr(status)));
4005                         return status;
4006                 }
4007
4008                 /*
4009                  * Recheck the current state of the file, which may have changed.
4010                  * (suid/sgid bits, for instance)
4011                  */
4012
4013                 status = vfs_stat_fsp(fsp);
4014                 if (!NT_STATUS_IS_OK(status)) {
4015                         return status;
4016                 }
4017
4018                 /* Save the original element we check against. */
4019                 orig_mode = fsp->fsp_name->st.st_ex_mode;
4020
4021                 /* If we successfully chowned, we know we must
4022                  * be able to set the acl, so do it as root.
4023                  */
4024                 set_acl_as_root = true;
4025         }
4026
4027         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
4028
4029         if((security_info_sent & SECINFO_DACL) &&
4030                         (psd->type & SEC_DESC_DACL_PRESENT) &&
4031                         (psd->dacl == NULL)) {
4032                 struct security_ace ace[3];
4033
4034                 /* We can't have NULL DACL in POSIX.
4035                    Use owner/group/Everyone -> full access. */
4036
4037                 init_sec_ace(&ace[0],
4038                                 &file_owner_sid,
4039                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4040                                 GENERIC_ALL_ACCESS,
4041                                 0);
4042                 init_sec_ace(&ace[1],
4043                                 &file_grp_sid,
4044                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4045                                 GENERIC_ALL_ACCESS,
4046                                 0);
4047                 init_sec_ace(&ace[2],
4048                                 &global_sid_World,
4049                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4050                                 GENERIC_ALL_ACCESS,
4051                                 0);
4052                 psd->dacl = make_sec_acl(talloc_tos(),
4053                                         NT4_ACL_REVISION,
4054                                         3,
4055                                         ace);
4056                 if (psd->dacl == NULL) {
4057                         return NT_STATUS_NO_MEMORY;
4058                 }
4059                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
4060         }
4061
4062         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
4063                                      &file_grp_sid, &file_ace_list,
4064                                      &dir_ace_list, security_info_sent, psd);
4065
4066         /* Ignore W2K traverse DACL set. */
4067         if (!file_ace_list && !dir_ace_list) {
4068                 return NT_STATUS_OK;
4069         }
4070
4071         if (!acl_perms) {
4072                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
4073                 free_canon_ace_list(file_ace_list);
4074                 free_canon_ace_list(dir_ace_list);
4075                 return NT_STATUS_ACCESS_DENIED;
4076         }
4077
4078         /*
4079          * Only change security if we got a DACL.
4080          */
4081
4082         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
4083                 free_canon_ace_list(file_ace_list);
4084                 free_canon_ace_list(dir_ace_list);
4085                 return NT_STATUS_OK;
4086         }
4087
4088         /*
4089          * Try using the POSIX ACL set first. Fall back to chmod if
4090          * we have no ACL support on this filesystem.
4091          */
4092
4093         if (acl_perms && file_ace_list) {
4094                 if (set_acl_as_root) {
4095                         become_root();
4096                 }
4097                 ret = set_canon_ace_list(fsp, file_ace_list, false,
4098                                          &fsp->fsp_name->st, &acl_set_support);
4099                 if (set_acl_as_root) {
4100                         unbecome_root();
4101                 }
4102                 if (acl_set_support && ret == false) {
4103                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
4104                                  "%s (%s).\n", fsp_str_dbg(fsp),
4105                                  strerror(errno)));
4106                         free_canon_ace_list(file_ace_list);
4107                         free_canon_ace_list(dir_ace_list);
4108                         return map_nt_error_from_unix(errno);
4109                 }
4110         }
4111
4112         if (acl_perms && acl_set_support && fsp->is_directory) {
4113                 if (dir_ace_list) {
4114                         if (set_acl_as_root) {
4115                                 become_root();
4116                         }
4117                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
4118                                                  &fsp->fsp_name->st,
4119                                                  &acl_set_support);
4120                         if (set_acl_as_root) {
4121                                 unbecome_root();
4122                         }
4123                         if (ret == false) {
4124                                 DEBUG(3,("set_nt_acl: failed to set default "
4125                                          "acl on directory %s (%s).\n",
4126                                          fsp_str_dbg(fsp), strerror(errno)));
4127                                 free_canon_ace_list(file_ace_list);
4128                                 free_canon_ace_list(dir_ace_list);
4129                                 return map_nt_error_from_unix(errno);
4130                         }
4131                 } else {
4132                         int sret = -1;
4133
4134                         /*
4135                          * No default ACL - delete one if it exists.
4136                          */
4137
4138                         if (set_acl_as_root) {
4139                                 become_root();
4140                         }
4141                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4142                             fsp->fsp_name->base_name);
4143                         if (set_acl_as_root) {
4144                                 unbecome_root();
4145                         }
4146                         if (sret == -1) {
4147                                 if (acl_group_override(conn, fsp->fsp_name)) {
4148                                         DEBUG(5,("set_nt_acl: acl group "
4149                                                  "control on and current user "
4150                                                  "in file %s primary group. "
4151                                                  "Override delete_def_acl\n",
4152                                                  fsp_str_dbg(fsp)));
4153
4154                                         become_root();
4155                                         sret =
4156                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4157                                                     conn,
4158                                                     fsp->fsp_name->base_name);
4159                                         unbecome_root();
4160                                 }
4161
4162                                 if (sret == -1) {
4163                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4164                                         free_canon_ace_list(file_ace_list);
4165                                         free_canon_ace_list(dir_ace_list);
4166                                         return map_nt_error_from_unix(errno);
4167                                 }
4168                         }
4169                 }
4170         }
4171
4172         if (acl_set_support) {
4173                 if (set_acl_as_root) {
4174                         become_root();
4175                 }
4176                 store_inheritance_attributes(fsp,
4177                                 file_ace_list,
4178                                 dir_ace_list,
4179                                 psd->type);
4180                 if (set_acl_as_root) {
4181                         unbecome_root();
4182                 }
4183         }
4184
4185         /*
4186          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4187          */
4188
4189         if(!acl_set_support && acl_perms) {
4190                 mode_t posix_perms;
4191
4192                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4193                         free_canon_ace_list(file_ace_list);
4194                         free_canon_ace_list(dir_ace_list);
4195                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4196                                  "posix permissions for file %s.\n",
4197                                  fsp_str_dbg(fsp)));
4198                         return NT_STATUS_ACCESS_DENIED;
4199                 }
4200
4201                 if (orig_mode != posix_perms) {
4202                         int sret = -1;
4203
4204                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4205                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4206
4207                         if (set_acl_as_root) {
4208                                 become_root();
4209                         }
4210                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4211                                              posix_perms);
4212                         if (set_acl_as_root) {
4213                                 unbecome_root();
4214                         }
4215                         if(sret == -1) {
4216                                 if (acl_group_override(conn, fsp->fsp_name)) {
4217                                         DEBUG(5,("set_nt_acl: acl group "
4218                                                  "control on and current user "
4219                                                  "in file %s primary group. "
4220                                                  "Override chmod\n",
4221                                                  fsp_str_dbg(fsp)));
4222
4223                                         become_root();
4224                                         sret = SMB_VFS_CHMOD(conn,
4225                                             fsp->fsp_name->base_name,
4226                                             posix_perms);
4227                                         unbecome_root();
4228                                 }
4229
4230                                 if (sret == -1) {
4231                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4232                                                  "failed. Error = %s.\n",
4233                                                  fsp_str_dbg(fsp),
4234                                                  (unsigned int)posix_perms,
4235                                                  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                         }
4241                 }
4242         }
4243
4244         free_canon_ace_list(file_ace_list);
4245         free_canon_ace_list(dir_ace_list);
4246
4247         /* Ensure the stat struct in the fsp is correct. */
4248         status = vfs_stat_fsp(fsp);
4249
4250         return NT_STATUS_OK;
4251 }
4252
4253 /****************************************************************************
4254  Get the actual group bits stored on a file with an ACL. Has no effect if
4255  the file has no ACL. Needed in dosmode code where the stat() will return
4256  the mask bits, not the real group bits, for a file with an ACL.
4257 ****************************************************************************/
4258
4259 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4260 {
4261         int entry_id = SMB_ACL_FIRST_ENTRY;
4262         SMB_ACL_ENTRY_T entry;
4263         SMB_ACL_T posix_acl;
4264         int result = -1;
4265
4266         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4267         if (posix_acl == (SMB_ACL_T)NULL)
4268                 return -1;
4269
4270         while (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4271                 SMB_ACL_TAG_T tagtype;
4272                 SMB_ACL_PERMSET_T permset;
4273
4274                 entry_id = SMB_ACL_NEXT_ENTRY;
4275
4276                 if (sys_acl_get_tag_type(entry, &tagtype) ==-1)
4277                         break;
4278
4279                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4280                         if (sys_acl_get_permset(entry, &permset) == -1) {
4281                                 break;
4282                         } else {
4283                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4284                                 *mode |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRGRP : 0);
4285                                 *mode |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4286                                 *mode |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4287                                 result = 0;
4288                                 break;
4289                         }
4290                 }
4291         }
4292         TALLOC_FREE(posix_acl);
4293         return result;
4294 }
4295
4296 /****************************************************************************
4297  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4298  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4299 ****************************************************************************/
4300
4301 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4302 {
4303         int entry_id = SMB_ACL_FIRST_ENTRY;
4304         SMB_ACL_ENTRY_T entry;
4305         int num_entries = 0;
4306
4307         while ( sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4308                 SMB_ACL_TAG_T tagtype;
4309                 SMB_ACL_PERMSET_T permset;
4310                 mode_t perms;
4311
4312                 entry_id = SMB_ACL_NEXT_ENTRY;
4313
4314                 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
4315                         return -1;
4316
4317                 if (sys_acl_get_permset(entry, &permset) == -1)
4318                         return -1;
4319
4320                 num_entries++;
4321
4322                 switch(tagtype) {
4323                         case SMB_ACL_USER_OBJ:
4324                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4325                                 break;
4326                         case SMB_ACL_GROUP_OBJ:
4327                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4328                                 break;
4329                         case SMB_ACL_MASK:
4330                                 /*
4331                                  * FIXME: The ACL_MASK entry permissions should really be set to
4332                                  * the union of the permissions of all ACL_USER,
4333                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4334                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4335                                  */
4336                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4337                                 break;
4338                         case SMB_ACL_OTHER:
4339                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4340                                 break;
4341                         default:
4342                                 continue;
4343                 }
4344
4345                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4346                         return -1;
4347
4348                 if (sys_acl_set_permset(entry, permset) == -1)
4349                         return -1;
4350         }
4351
4352         /*
4353          * If this is a simple 3 element ACL or no elements then it's a standard
4354          * UNIX permission set. Just use chmod...
4355          */
4356
4357         if ((num_entries == 3) || (num_entries == 0))
4358                 return -1;
4359
4360         return 0;
4361 }
4362
4363 /****************************************************************************
4364  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4365  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4366  resulting ACL on TO.  Note that name is in UNIX character set.
4367 ****************************************************************************/
4368
4369 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4370 {
4371         SMB_ACL_T posix_acl = NULL;
4372         int ret = -1;
4373
4374         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4375                 return -1;
4376
4377         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4378                 goto done;
4379
4380         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4381
4382  done:
4383
4384         TALLOC_FREE(posix_acl);
4385         return ret;
4386 }
4387
4388 /****************************************************************************
4389  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4390  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4391  Note that name is in UNIX character set.
4392 ****************************************************************************/
4393
4394 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4395 {
4396         return copy_access_posix_acl(conn, name, name, mode);
4397 }
4398
4399 /****************************************************************************
4400  Check for an existing default POSIX ACL on a directory.
4401 ****************************************************************************/
4402
4403 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4404 {
4405         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4406         bool has_acl = False;
4407         SMB_ACL_ENTRY_T entry;
4408
4409         if (def_acl != NULL && (sys_acl_get_entry(def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4410                 has_acl = True;
4411         }
4412
4413         if (def_acl) {
4414                 TALLOC_FREE(def_acl);
4415         }
4416         return has_acl;
4417 }
4418
4419 /****************************************************************************
4420  If the parent directory has no default ACL but it does have an Access ACL,
4421  inherit this Access ACL to file name.
4422 ****************************************************************************/
4423
4424 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4425                        const char *name, mode_t mode)
4426 {
4427         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4428                 return 0;
4429
4430         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4431 }
4432
4433 /****************************************************************************
4434  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4435  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4436 ****************************************************************************/
4437
4438 int fchmod_acl(files_struct *fsp, mode_t mode)
4439 {
4440         connection_struct *conn = fsp->conn;
4441         SMB_ACL_T posix_acl = NULL;
4442         int ret = -1;
4443
4444         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4445                 return -1;
4446
4447         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4448                 goto done;
4449
4450         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4451
4452   done:
4453
4454         TALLOC_FREE(posix_acl);
4455         return ret;
4456 }
4457
4458 /****************************************************************************
4459  Map from wire type to permset.
4460 ****************************************************************************/
4461
4462 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4463 {
4464         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4465                 return False;
4466         }
4467
4468         if (sys_acl_clear_perms(*p_permset) ==  -1) {
4469                 return False;
4470         }
4471
4472         if (wire_perm & SMB_POSIX_ACL_READ) {
4473                 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1) {
4474                         return False;
4475                 }
4476         }
4477         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4478                 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1) {
4479                         return False;
4480                 }
4481         }
4482         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4483                 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1) {
4484                         return False;
4485                 }
4486         }
4487         return True;
4488 }
4489
4490 /****************************************************************************
4491  Map from wire type to tagtype.
4492 ****************************************************************************/
4493
4494 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4495 {
4496         switch (wire_tt) {
4497                 case SMB_POSIX_ACL_USER_OBJ:
4498                         *p_tt = SMB_ACL_USER_OBJ;
4499                         break;
4500                 case SMB_POSIX_ACL_USER:
4501                         *p_tt = SMB_ACL_USER;
4502                         break;
4503                 case SMB_POSIX_ACL_GROUP_OBJ:
4504                         *p_tt = SMB_ACL_GROUP_OBJ;
4505                         break;
4506                 case SMB_POSIX_ACL_GROUP:
4507                         *p_tt = SMB_ACL_GROUP;
4508                         break;
4509                 case SMB_POSIX_ACL_MASK:
4510                         *p_tt = SMB_ACL_MASK;
4511                         break;
4512                 case SMB_POSIX_ACL_OTHER:
4513                         *p_tt = SMB_ACL_OTHER;
4514                         break;
4515                 default:
4516                         return False;
4517         }
4518         return True;
4519 }
4520
4521 /****************************************************************************
4522  Create a new POSIX acl from wire permissions.
4523  FIXME ! How does the share mask/mode fit into this.... ?
4524 ****************************************************************************/
4525
4526 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4527 {
4528         unsigned int i;
4529         SMB_ACL_T the_acl = sys_acl_init();
4530
4531         if (the_acl == NULL) {
4532                 return NULL;
4533         }
4534
4535         for (i = 0; i < num_acls; i++) {
4536                 SMB_ACL_ENTRY_T the_entry;
4537                 SMB_ACL_PERMSET_T the_permset;
4538                 SMB_ACL_TAG_T tag_type;
4539
4540                 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
4541                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4542                                 i, strerror(errno) ));
4543                         goto fail;
4544                 }
4545
4546                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4547                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4548                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4549                         goto fail;
4550                 }
4551
4552                 if (sys_acl_set_tag_type(the_entry, tag_type) == -1) {
4553                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4554                                 i, strerror(errno) ));
4555                         goto fail;
4556                 }
4557
4558                 /* Get the permset pointer from the new ACL entry. */
4559                 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
4560                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4561                                 i, strerror(errno) ));
4562                         goto fail;
4563                 }
4564
4565                 /* Map from wire to permissions. */
4566                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4567                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4568                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4569                         goto fail;
4570                 }
4571
4572                 /* Now apply to the new ACL entry. */
4573                 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
4574                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4575                                 i, strerror(errno) ));
4576                         goto fail;
4577                 }
4578
4579                 if (tag_type == SMB_ACL_USER) {
4580                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4581                         uid_t uid = (uid_t)uidval;
4582                         if (sys_acl_set_qualifier(the_entry,(void *)&uid) == -1) {
4583                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4584                                         (unsigned int)uid, i, strerror(errno) ));
4585                                 goto fail;
4586                         }
4587                 }
4588
4589                 if (tag_type == SMB_ACL_GROUP) {
4590                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4591                         gid_t gid = (uid_t)gidval;
4592                         if (sys_acl_set_qualifier(the_entry,(void *)&gid) == -1) {
4593                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4594                                         (unsigned int)gid, i, strerror(errno) ));
4595                                 goto fail;
4596                         }
4597                 }
4598         }
4599
4600         return the_acl;
4601
4602  fail:
4603
4604         if (the_acl != NULL) {
4605                 TALLOC_FREE(the_acl);
4606         }
4607         return NULL;
4608 }
4609
4610 /****************************************************************************
4611  Calls from UNIX extensions - Default POSIX ACL set.
4612  If num_def_acls == 0 and not a directory just return. If it is a directory
4613  and num_def_acls == 0 then remove the default acl. Else set the default acl
4614  on the directory.
4615 ****************************************************************************/
4616
4617 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4618                                 uint16 num_def_acls, const char *pdata)
4619 {
4620         SMB_ACL_T def_acl = NULL;
4621
4622         if (!S_ISDIR(psbuf->st_ex_mode)) {
4623                 if (num_def_acls) {
4624                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4625                         errno = EISDIR;
4626                         return False;
4627                 } else {
4628                         return True;
4629                 }
4630         }
4631
4632         if (!num_def_acls) {
4633                 /* Remove the default ACL. */
4634                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4635                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4636                                 fname, strerror(errno) ));
4637                         return False;
4638                 }
4639                 return True;
4640         }
4641
4642         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4643                 return False;
4644         }
4645
4646         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4647                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4648                         fname, strerror(errno) ));
4649                 TALLOC_FREE(def_acl);
4650                 return False;
4651         }
4652
4653         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4654         TALLOC_FREE(def_acl);
4655         return True;
4656 }
4657
4658 /****************************************************************************
4659  Remove an ACL from a file. As we don't have acl_delete_entry() available
4660  we must read the current acl and copy all entries except MASK, USER and GROUP
4661  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4662  removed.
4663  FIXME ! How does the share mask/mode fit into this.... ?
4664 ****************************************************************************/
4665
4666 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4667 {
4668         SMB_ACL_T file_acl = NULL;
4669         int entry_id = SMB_ACL_FIRST_ENTRY;
4670         SMB_ACL_ENTRY_T entry;
4671         bool ret = False;
4672         /* Create a new ACL with only 3 entries, u/g/w. */
4673         SMB_ACL_T new_file_acl = sys_acl_init();
4674         SMB_ACL_ENTRY_T user_ent = NULL;
4675         SMB_ACL_ENTRY_T group_ent = NULL;
4676         SMB_ACL_ENTRY_T other_ent = NULL;
4677
4678         if (new_file_acl == NULL) {
4679                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4680                 return False;
4681         }
4682
4683         /* Now create the u/g/w entries. */
4684         if (sys_acl_create_entry(&new_file_acl, &user_ent) == -1) {
4685                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4686                         fname, strerror(errno) ));
4687                 goto done;
4688         }
4689         if (sys_acl_set_tag_type(user_ent, SMB_ACL_USER_OBJ) == -1) {
4690                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4691                         fname, strerror(errno) ));
4692                 goto done;
4693         }
4694
4695         if (sys_acl_create_entry(&new_file_acl, &group_ent) == -1) {
4696                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4697                         fname, strerror(errno) ));
4698                 goto done;
4699         }
4700         if (sys_acl_set_tag_type(group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4701                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4702                         fname, strerror(errno) ));
4703                 goto done;
4704         }
4705
4706         if (sys_acl_create_entry(&new_file_acl, &other_ent) == -1) {
4707                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4708                         fname, strerror(errno) ));
4709                 goto done;
4710         }
4711         if (sys_acl_set_tag_type(other_ent, SMB_ACL_OTHER) == -1) {
4712                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4713                         fname, strerror(errno) ));
4714                 goto done;
4715         }
4716
4717         /* Get the current file ACL. */
4718         if (fsp && fsp->fh->fd != -1) {
4719                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4720         } else {
4721                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4722         }
4723
4724         if (file_acl == NULL) {
4725                 /* This is only returned if an error occurred. Even for a file with
4726                    no acl a u/g/w acl should be returned. */
4727                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4728                         fname, strerror(errno) ));
4729                 goto done;
4730         }
4731
4732         while ( sys_acl_get_entry(file_acl, entry_id, &entry) == 1) {
4733                 SMB_ACL_TAG_T tagtype;
4734                 SMB_ACL_PERMSET_T permset;
4735
4736                 entry_id = SMB_ACL_NEXT_ENTRY;
4737
4738                 if (sys_acl_get_tag_type(entry, &tagtype) == -1) {
4739                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4740                                 fname, strerror(errno) ));
4741                         goto done;
4742                 }
4743
4744                 if (sys_acl_get_permset(entry, &permset) == -1) {
4745                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4746                                 fname, strerror(errno) ));
4747                         goto done;
4748                 }
4749
4750                 if (tagtype == SMB_ACL_USER_OBJ) {
4751                         if (sys_acl_set_permset(user_ent, permset) == -1) {
4752                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4753                                         fname, strerror(errno) ));
4754                         }
4755                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4756                         if (sys_acl_set_permset(group_ent, permset) == -1) {
4757                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4758                                         fname, strerror(errno) ));
4759                         }
4760                 } else if (tagtype == SMB_ACL_OTHER) {
4761                         if (sys_acl_set_permset(other_ent, permset) == -1) {
4762                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4763                                         fname, strerror(errno) ));
4764                         }
4765                 }
4766         }
4767
4768         /* Set the new empty file ACL. */
4769         if (fsp && fsp->fh->fd != -1) {
4770                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4771                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4772                                 fname, strerror(errno) ));
4773                         goto done;
4774                 }
4775         } else {
4776                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4777                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4778                                 fname, strerror(errno) ));
4779                         goto done;
4780                 }
4781         }
4782
4783         ret = True;
4784
4785  done:
4786
4787         if (file_acl) {
4788                 TALLOC_FREE(file_acl);
4789         }
4790         if (new_file_acl) {
4791                 TALLOC_FREE(new_file_acl);
4792         }
4793         return ret;
4794 }
4795
4796 /****************************************************************************
4797  Calls from UNIX extensions - POSIX ACL set.
4798  If num_def_acls == 0 then read/modify/write acl after removing all entries
4799  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4800 ****************************************************************************/
4801
4802 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4803 {
4804         SMB_ACL_T file_acl = NULL;
4805
4806         if (!num_acls) {
4807                 /* Remove the ACL from the file. */
4808                 return remove_posix_acl(conn, fsp, fname);
4809         }
4810
4811         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4812                 return False;
4813         }
4814
4815         if (fsp && fsp->fh->fd != -1) {
4816                 /* The preferred way - use an open fd. */
4817                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4818                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4819                                 fname, strerror(errno) ));
4820                         TALLOC_FREE(file_acl);
4821                         return False;
4822                 }
4823         } else {
4824                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4825                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4826                                 fname, strerror(errno) ));
4827                         TALLOC_FREE(file_acl);
4828                         return False;
4829                 }
4830         }
4831
4832         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4833         TALLOC_FREE(file_acl);
4834         return True;
4835 }
4836
4837 /********************************************************************
4838  Pull the NT ACL from a file on disk or the OpenEventlog() access
4839  check.  Caller is responsible for freeing the returned security
4840  descriptor via TALLOC_FREE().  This is designed for dealing with
4841  user space access checks in smbd outside of the VFS.  For example,
4842  checking access rights in OpenEventlog().
4843
4844  Assume we are dealing with files (for now)
4845 ********************************************************************/
4846
4847 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname, uint32 security_info_wanted)
4848 {
4849         struct security_descriptor *psd, *ret_sd;
4850         connection_struct *conn;
4851         files_struct finfo;
4852         struct fd_handle fh;
4853         NTSTATUS status;
4854         TALLOC_CTX *frame = talloc_stackframe();
4855
4856         conn = talloc_zero(frame, connection_struct);
4857         if (conn == NULL) {
4858                 DEBUG(0, ("talloc failed\n"));
4859                 return NULL;
4860         }
4861
4862         if (!(conn->params = talloc(conn, struct share_params))) {
4863                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4864                 TALLOC_FREE(frame);
4865                 return NULL;
4866         }
4867
4868         conn->params->service = -1;
4869
4870         set_conn_connectpath(conn, "/");
4871
4872         if (!smbd_vfs_init(conn)) {
4873                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4874                 conn_free(conn);
4875                 TALLOC_FREE(frame);
4876                 return NULL;
4877         }
4878
4879         ZERO_STRUCT( finfo );
4880         ZERO_STRUCT( fh );
4881
4882         finfo.fnum = FNUM_FIELD_INVALID;
4883         finfo.conn = conn;
4884         finfo.fh = &fh;
4885         finfo.fh->fd = -1;
4886
4887         status = create_synthetic_smb_fname(frame, fname, NULL, NULL,
4888                                             &finfo.fsp_name);
4889         if (!NT_STATUS_IS_OK(status)) {
4890                 conn_free(conn);
4891                 TALLOC_FREE(frame);
4892                 return NULL;
4893         }
4894
4895         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, security_info_wanted, &psd))) {
4896                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4897                 TALLOC_FREE(finfo.fsp_name);
4898                 conn_free(conn);
4899                 TALLOC_FREE(frame);
4900                 return NULL;
4901         }
4902
4903         ret_sd = dup_sec_desc( ctx, psd );
4904
4905         TALLOC_FREE(finfo.fsp_name);
4906         conn_free(conn);
4907         TALLOC_FREE(frame);
4908
4909         return ret_sd;
4910 }
4911
4912 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4913
4914 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4915                                         const char *name,
4916                                         SMB_STRUCT_STAT *psbuf,
4917                                         struct security_descriptor **ppdesc)
4918 {
4919         struct dom_sid owner_sid, group_sid;
4920         size_t size = 0;
4921         struct security_ace aces[4];
4922         uint32_t access_mask = 0;
4923         mode_t mode = psbuf->st_ex_mode;
4924         struct security_acl *new_dacl = NULL;
4925         int idx = 0;
4926
4927         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4928                 name, (int)mode ));
4929
4930         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4931         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4932
4933         /*
4934          We provide up to 4 ACEs
4935                 - Owner
4936                 - Group
4937                 - Everyone
4938                 - NT System
4939         */
4940
4941         if (mode & S_IRUSR) {
4942                 if (mode & S_IWUSR) {
4943                         access_mask |= SEC_RIGHTS_FILE_ALL;
4944                 } else {
4945                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4946                 }
4947         }
4948         if (mode & S_IWUSR) {
4949                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4950         }
4951
4952         init_sec_ace(&aces[idx],
4953                         &owner_sid,
4954                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4955                         access_mask,
4956                         0);
4957         idx++;
4958
4959         access_mask = 0;
4960         if (mode & S_IRGRP) {
4961                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4962         }
4963         if (mode & S_IWGRP) {
4964                 /* note that delete is not granted - this matches posix behaviour */
4965                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4966         }
4967         if (access_mask) {
4968                 init_sec_ace(&aces[idx],
4969                         &group_sid,
4970                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4971                         access_mask,
4972                         0);
4973                 idx++;
4974         }
4975
4976         access_mask = 0;
4977         if (mode & S_IROTH) {
4978                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4979         }
4980         if (mode & S_IWOTH) {
4981                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4982         }
4983         if (access_mask) {
4984                 init_sec_ace(&aces[idx],
4985                         &global_sid_World,
4986                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4987                         access_mask,
4988                         0);
4989                 idx++;
4990         }
4991
4992         init_sec_ace(&aces[idx],
4993                         &global_sid_System,
4994                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4995                         SEC_RIGHTS_FILE_ALL,
4996                         0);
4997         idx++;
4998
4999         new_dacl = make_sec_acl(ctx,
5000                         NT4_ACL_REVISION,
5001                         idx,
5002                         aces);
5003
5004         if (!new_dacl) {
5005                 return NT_STATUS_NO_MEMORY;
5006         }
5007
5008         *ppdesc = make_sec_desc(ctx,
5009                         SECURITY_DESCRIPTOR_REVISION_1,
5010                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
5011                         &owner_sid,
5012                         &group_sid,
5013                         NULL,
5014                         new_dacl,
5015                         &size);
5016         if (!*ppdesc) {
5017                 return NT_STATUS_NO_MEMORY;
5018         }
5019         return NT_STATUS_OK;
5020 }