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