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