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