source3/smbd/posix_acls.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB NT Security Descriptor / Unix permission conversion.
   4    Copyright (C) Jeremy Allison 1994-2009.
   5    Copyright (C) Andreas Gruenbacher 2002.
   6    Copyright (C) Simo Sorce <idra@samba.org> 2009.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "smbd/smbd.h"
  24 #include "system/filesys.h"
  25 #include "../libcli/security/security.h"
  26 #include "trans2.h"
  27 #include "passdb/lookup_sid.h"
  28 #include "auth.h"
  29
  30 extern const struct generic_mapping file_generic_mapping;
  31
  32 #undef  DBGC_CLASS
  33 #define DBGC_CLASS DBGC_ACLS
  34
  35 /****************************************************************************
  36  Data structures representing the internal ACE format.
  37 ****************************************************************************/
  38
  39 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  40 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  41
  42 typedef union posix_id {
  43                 uid_t uid;
  44                 gid_t gid;
  45                 int world;
  46 } posix_id;
  47
  48 typedef struct canon_ace {
  49         struct canon_ace *next, *prev;
  50         SMB_ACL_TAG_T type;
  51         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  52         struct dom_sid trustee;
  53         enum ace_owner owner_type;
  54         enum ace_attribute attr;
  55         posix_id unix_ug;
  56         uint8_t ace_flags; /* From windows ACE entry. */
  57 } canon_ace;
  58
  59 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  60
  61 /*
  62  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  63  * attribute on disk - version 1.
  64  * All values are little endian.
  65  *
  66  * |  1   |  1   |   2         |         2           |  ....
  67  * +------+------+-------------+---------------------+-------------+--------------------+
  68  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  69  * +------+------+-------------+---------------------+-------------+--------------------+
  70  *
  71  * Entry format is :
  72  *
  73  * |  1   |       4           |
  74  * +------+-------------------+
  75  * | value|  uid/gid or world |
  76  * | type |  value            |
  77  * +------+-------------------+
  78  *
  79  * Version 2 format. Stores extra Windows metadata about an ACL.
  80  *
  81  * |  1   |  2       |   2         |         2           |  ....
  82  * +------+----------+-------------+---------------------+-------------+--------------------+
  83  * | vers | ace      | num_entries | num_default_entries | ..entries.. | default_entries... |
  84  * |   2  |  type    |             |                     |             |                    |
  85  * +------+----------+-------------+---------------------+-------------+--------------------+
  86  *
  87  * Entry format is :
  88  *
  89  * |  1   |  1   |       4           |
  90  * +------+------+-------------------+
  91  * | ace  | value|  uid/gid or world |
  92  * | flag | type |  value            |
  93  * +------+-------------------+------+
  94  *
  95  */
  96
  97 #define PAI_VERSION_OFFSET                      0
  98
  99 #define PAI_V1_FLAG_OFFSET                      1
 100 #define PAI_V1_NUM_ENTRIES_OFFSET               2
 101 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET       4
 102 #define PAI_V1_ENTRIES_BASE                     6
 103 #define PAI_V1_ACL_FLAG_PROTECTED               0x1
 104 #define PAI_V1_ENTRY_LENGTH                     5
 105
 106 #define PAI_V1_VERSION                          1
 107
 108 #define PAI_V2_TYPE_OFFSET                      1
 109 #define PAI_V2_NUM_ENTRIES_OFFSET               3
 110 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET       5
 111 #define PAI_V2_ENTRIES_BASE                     7
 112 #define PAI_V2_ENTRY_LENGTH                     6
 113
 114 #define PAI_V2_VERSION                          2
 115
 116 /*
 117  * In memory format of user.SAMBA_PAI attribute.
 118  */
 119
 120 struct pai_entry {
 121         struct pai_entry *next, *prev;
 122         uint8_t ace_flags;
 123         enum ace_owner owner_type;
 124         posix_id unix_ug;
 125 };
 126
 127 struct pai_val {
 128         uint16_t sd_type;
 129         unsigned int num_entries;
 130         struct pai_entry *entry_list;
 131         unsigned int num_def_entries;
 132         struct pai_entry *def_entry_list;
 133 };
 134
 135 /************************************************************************
 136  Return a uint32 of the pai_entry principal.
 137 ************************************************************************/
 138
 139 static uint32_t get_pai_entry_val(struct pai_entry *paie)
 140 {
 141         switch (paie->owner_type) {
 142                 case UID_ACE:
 143                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 144                         return (uint32_t)paie->unix_ug.uid;
 145                 case GID_ACE:
 146                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 147                         return (uint32_t)paie->unix_ug.gid;
 148                 case WORLD_ACE:
 149                 default:
 150                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 151                         return (uint32_t)-1;
 152         }
 153 }
 154
 155 /************************************************************************
 156  Return a uint32 of the entry principal.
 157 ************************************************************************/
 158
 159 static uint32_t get_entry_val(canon_ace *ace_entry)
 160 {
 161         switch (ace_entry->owner_type) {
 162                 case UID_ACE:
 163                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
 164                         return (uint32_t)ace_entry->unix_ug.uid;
 165                 case GID_ACE:
 166                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
 167                         return (uint32_t)ace_entry->unix_ug.gid;
 168                 case WORLD_ACE:
 169                 default:
 170                         DEBUG(10,("get_entry_val: world ace\n"));
 171                         return (uint32_t)-1;
 172         }
 173 }
 174
 175 /************************************************************************
 176  Create the on-disk format (always v2 now). Caller must free.
 177 ************************************************************************/
 178
 179 static char *create_pai_buf_v2(canon_ace *file_ace_list,
 180                                 canon_ace *dir_ace_list,
 181                                 uint16_t sd_type,
 182                                 size_t *store_size)
 183 {
 184         char *pai_buf = NULL;
 185         canon_ace *ace_list = NULL;
 186         char *entry_offset = NULL;
 187         unsigned int num_entries = 0;
 188         unsigned int num_def_entries = 0;
 189         unsigned int i;
 190
 191         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 192                 num_entries++;
 193         }
 194
 195         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 196                 num_def_entries++;
 197         }
 198
 199         DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 200
 201         *store_size = PAI_V2_ENTRIES_BASE +
 202                 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
 203
 204         pai_buf = talloc_array(talloc_tos(), char, *store_size);
 205         if (!pai_buf) {
 206                 return NULL;
 207         }
 208
 209         /* Set up the header. */
 210         memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
 211         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
 212         SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
 213         SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
 214         SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 215
 216         DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
 217                         (unsigned int)sd_type ));
 218
 219         entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
 220
 221         i = 0;
 222         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 223                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 224                 uint32_t entry_val = get_entry_val(ace_list);
 225
 226                 SCVAL(entry_offset,0,ace_list->ace_flags);
 227                 SCVAL(entry_offset,1,type_val);
 228                 SIVAL(entry_offset,2,entry_val);
 229                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 230                         i,
 231                         (unsigned int)ace_list->ace_flags,
 232                         (unsigned int)type_val,
 233                         (unsigned int)entry_val ));
 234                 i++;
 235                 entry_offset += PAI_V2_ENTRY_LENGTH;
 236         }
 237
 238         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 239                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 240                 uint32_t entry_val = get_entry_val(ace_list);
 241
 242                 SCVAL(entry_offset,0,ace_list->ace_flags);
 243                 SCVAL(entry_offset,1,type_val);
 244                 SIVAL(entry_offset,2,entry_val);
 245                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 246                         i,
 247                         (unsigned int)ace_list->ace_flags,
 248                         (unsigned int)type_val,
 249                         (unsigned int)entry_val ));
 250                 i++;
 251                 entry_offset += PAI_V2_ENTRY_LENGTH;
 252         }
 253
 254         return pai_buf;
 255 }
 256
 257 /************************************************************************
 258  Store the user.SAMBA_PAI attribute on disk.
 259 ************************************************************************/
 260
 261 static void store_inheritance_attributes(files_struct *fsp,
 262                                         canon_ace *file_ace_list,
 263                                         canon_ace *dir_ace_list,
 264                                         uint16_t sd_type)
 265 {
 266         int ret;
 267         size_t store_size;
 268         char *pai_buf;
 269
 270         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 271                 return;
 272         }
 273
 274         pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
 275                                 sd_type, &store_size);
 276
 277         if (fsp->fh->fd != -1) {
 278                 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 279                                 pai_buf, store_size, 0);
 280         } else {
 281                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
 282                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 283                                        pai_buf, store_size, 0);
 284         }
 285
 286         TALLOC_FREE(pai_buf);
 287
 288         DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
 289                 (unsigned int)sd_type,
 290                 fsp_str_dbg(fsp)));
 291
 292         if (ret == -1 && !no_acl_syscall_error(errno)) {
 293                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 294         }
 295 }
 296
 297 /************************************************************************
 298  Delete the in memory inheritance info.
 299 ************************************************************************/
 300
 301 static void free_inherited_info(struct pai_val *pal)
 302 {
 303         if (pal) {
 304                 struct pai_entry *paie, *paie_next;
 305                 for (paie = pal->entry_list; paie; paie = paie_next) {
 306                         paie_next = paie->next;
 307                         TALLOC_FREE(paie);
 308                 }
 309                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 310                         paie_next = paie->next;
 311                         TALLOC_FREE(paie);
 312                 }
 313                 TALLOC_FREE(pal);
 314         }
 315 }
 316
 317 /************************************************************************
 318  Get any stored ACE flags.
 319 ************************************************************************/
 320
 321 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
 322 {
 323         struct pai_entry *paie;
 324
 325         if (!pal) {
 326                 return 0;
 327         }
 328
 329         /* If the entry exists it is inherited. */
 330         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 331                 if (ace_entry->owner_type == paie->owner_type &&
 332                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 333                         return paie->ace_flags;
 334         }
 335         return 0;
 336 }
 337
 338 /************************************************************************
 339  Ensure an attribute just read is valid - v1.
 340 ************************************************************************/
 341
 342 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
 343 {
 344         uint16 num_entries;
 345         uint16 num_def_entries;
 346
 347         if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
 348                 /* Corrupted - too small. */
 349                 return false;
 350         }
 351
 352         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
 353                 return false;
 354         }
 355
 356         num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
 357         num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 358
 359         /* Check the entry lists match. */
 360         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 361
 362         if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
 363                         PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
 364                 return false;
 365         }
 366
 367         return true;
 368 }
 369
 370 /************************************************************************
 371  Ensure an attribute just read is valid - v2.
 372 ************************************************************************/
 373
 374 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
 375 {
 376         uint16 num_entries;
 377         uint16 num_def_entries;
 378
 379         if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
 380                 /* Corrupted - too small. */
 381                 return false;
 382         }
 383
 384         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
 385                 return false;
 386         }
 387
 388         num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
 389         num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 390
 391         /* Check the entry lists match. */
 392         /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
 393
 394         if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
 395                         PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
 396                 return false;
 397         }
 398
 399         return true;
 400 }
 401
 402 /************************************************************************
 403  Decode the owner.
 404 ************************************************************************/
 405
 406 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
 407 {
 408         paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 409         switch( paie->owner_type) {
 410                 case UID_ACE:
 411                         paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 412                         DEBUG(10,("get_pai_owner_type: uid = %u\n",
 413                                 (unsigned int)paie->unix_ug.uid ));
 414                         break;
 415                 case GID_ACE:
 416                         paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 417                         DEBUG(10,("get_pai_owner_type: gid = %u\n",
 418                                 (unsigned int)paie->unix_ug.gid ));
 419                         break;
 420                 case WORLD_ACE:
 421                         paie->unix_ug.world = -1;
 422                         DEBUG(10,("get_pai_owner_type: world ace\n"));
 423                         break;
 424                 default:
 425                         DEBUG(10,("get_pai_owner_type: unknown type %u\n",
 426                                 (unsigned int)paie->owner_type ));
 427                         return false;
 428         }
 429         return true;
 430 }
 431
 432 /************************************************************************
 433  Process v2 entries.
 434 ************************************************************************/
 435
 436 static const char *create_pai_v1_entries(struct pai_val *paiv,
 437                                 const char *entry_offset,
 438                                 bool def_entry)
 439 {
 440         int i;
 441
 442         for (i = 0; i < paiv->num_entries; i++) {
 443                 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
 444                 if (!paie) {
 445                         return NULL;
 446                 }
 447
 448                 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
 449                 if (!get_pai_owner_type(paie, entry_offset)) {
 450                         TALLOC_FREE(paie);
 451                         return NULL;
 452                 }
 453
 454                 if (!def_entry) {
 455                         DLIST_ADD(paiv->entry_list, paie);
 456                 } else {
 457                         DLIST_ADD(paiv->def_entry_list, paie);
 458                 }
 459                 entry_offset += PAI_V1_ENTRY_LENGTH;
 460         }
 461         return entry_offset;
 462 }
 463
 464 /************************************************************************
 465  Convert to in-memory format from version 1.
 466 ************************************************************************/
 467
 468 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
 469 {
 470         const char *entry_offset;
 471         struct pai_val *paiv = NULL;
 472
 473         if (!check_pai_ok_v1(buf, size)) {
 474                 return NULL;
 475         }
 476
 477         paiv = talloc(talloc_tos(), struct pai_val);
 478         if (!paiv) {
 479                 return NULL;
 480         }
 481
 482         memset(paiv, '\0', sizeof(struct pai_val));
 483
 484         paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
 485                         SEC_DESC_DACL_PROTECTED : 0;
 486
 487         paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
 488         paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 489
 490         entry_offset = buf + PAI_V1_ENTRIES_BASE;
 491
 492         DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
 493                         paiv->num_entries, paiv->num_def_entries ));
 494
 495         entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
 496         if (entry_offset == NULL) {
 497                 free_inherited_info(paiv);
 498                 return NULL;
 499         }
 500         entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
 501         if (entry_offset == NULL) {
 502                 free_inherited_info(paiv);
 503                 return NULL;
 504         }
 505
 506         return paiv;
 507 }
 508
 509 /************************************************************************
 510  Process v2 entries.
 511 ************************************************************************/
 512
 513 static const char *create_pai_v2_entries(struct pai_val *paiv,
 514                                 unsigned int num_entries,
 515                                 const char *entry_offset,
 516                                 bool def_entry)
 517 {
 518         unsigned int i;
 519
 520         for (i = 0; i < num_entries; i++) {
 521                 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
 522                 if (!paie) {
 523                         return NULL;
 524                 }
 525
 526                 paie->ace_flags = CVAL(entry_offset,0);
 527
 528                 if (!get_pai_owner_type(paie, entry_offset+1)) {
 529                         TALLOC_FREE(paie);
 530                         return NULL;
 531                 }
 532                 if (!def_entry) {
 533                         DLIST_ADD(paiv->entry_list, paie);
 534                 } else {
 535                         DLIST_ADD(paiv->def_entry_list, paie);
 536                 }
 537                 entry_offset += PAI_V2_ENTRY_LENGTH;
 538         }
 539         return entry_offset;
 540 }
 541
 542 /************************************************************************
 543  Convert to in-memory format from version 2.
 544 ************************************************************************/
 545
 546 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
 547 {
 548         const char *entry_offset;
 549         struct pai_val *paiv = NULL;
 550
 551         if (!check_pai_ok_v2(buf, size)) {
 552                 return NULL;
 553         }
 554
 555         paiv = talloc(talloc_tos(), struct pai_val);
 556         if (!paiv) {
 557                 return NULL;
 558         }
 559
 560         memset(paiv, '\0', sizeof(struct pai_val));
 561
 562         paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
 563
 564         paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
 565         paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 566
 567         entry_offset = buf + PAI_V2_ENTRIES_BASE;
 568
 569         DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
 570                         (unsigned int)paiv->sd_type,
 571                         paiv->num_entries, paiv->num_def_entries ));
 572
 573         entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
 574                                 entry_offset, false);
 575         if (entry_offset == NULL) {
 576                 free_inherited_info(paiv);
 577                 return NULL;
 578         }
 579         entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
 580                                 entry_offset, true);
 581         if (entry_offset == NULL) {
 582                 free_inherited_info(paiv);
 583                 return NULL;
 584         }
 585
 586         return paiv;
 587 }
 588
 589 /************************************************************************
 590  Convert to in-memory format - from either version 1 or 2.
 591 ************************************************************************/
 592
 593 static struct pai_val *create_pai_val(const char *buf, size_t size)
 594 {
 595         if (size < 1) {
 596                 return NULL;
 597         }
 598         if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
 599                 return create_pai_val_v1(buf, size);
 600         } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
 601                 return create_pai_val_v2(buf, size);
 602         } else {
 603                 return NULL;
 604         }
 605 }
 606
 607 /************************************************************************
 608  Load the user.SAMBA_PAI attribute.
 609 ************************************************************************/
 610
 611 static struct pai_val *fload_inherited_info(files_struct *fsp)
 612 {
 613         char *pai_buf;
 614         size_t pai_buf_size = 1024;
 615         struct pai_val *paiv = NULL;
 616         ssize_t ret;
 617
 618         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 619                 return NULL;
 620         }
 621
 622         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
 623                 return NULL;
 624         }
 625
 626         do {
 627                 if (fsp->fh->fd != -1) {
 628                         ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 629                                         pai_buf, pai_buf_size);
 630                 } else {
 631                         ret = SMB_VFS_GETXATTR(fsp->conn,
 632                                                fsp->fsp_name->base_name,
 633                                                SAMBA_POSIX_INHERITANCE_EA_NAME,
 634                                                pai_buf, pai_buf_size);
 635                 }
 636
 637                 if (ret == -1) {
 638                         if (errno != ERANGE) {
 639                                 break;
 640                         }
 641                         /* Buffer too small - enlarge it. */
 642                         pai_buf_size *= 2;
 643                         TALLOC_FREE(pai_buf);
 644                         if (pai_buf_size > 1024*1024) {
 645                                 return NULL; /* Limit malloc to 1mb. */
 646                         }
 647                         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
 648                                 return NULL;
 649                 }
 650         } while (ret == -1);
 651
 652         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
 653                   (unsigned long)ret, fsp_str_dbg(fsp)));
 654
 655         if (ret == -1) {
 656                 /* No attribute or not supported. */
 657 #if defined(ENOATTR)
 658                 if (errno != ENOATTR)
 659                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 660 #else
 661                 if (errno != ENOSYS)
 662                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 663 #endif
 664                 TALLOC_FREE(pai_buf);
 665                 return NULL;
 666         }
 667
 668         paiv = create_pai_val(pai_buf, ret);
 669
 670         if (paiv) {
 671                 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
 672                           (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
 673         }
 674
 675         TALLOC_FREE(pai_buf);
 676         return paiv;
 677 }
 678
 679 /************************************************************************
 680  Load the user.SAMBA_PAI attribute.
 681 ************************************************************************/
 682
 683 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
 684                                            const char *fname)
 685 {
 686         char *pai_buf;
 687         size_t pai_buf_size = 1024;
 688         struct pai_val *paiv = NULL;
 689         ssize_t ret;
 690
 691         if (!lp_map_acl_inherit(SNUM(conn))) {
 692                 return NULL;
 693         }
 694
 695         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
 696                 return NULL;
 697         }
 698
 699         do {
 700                 ret = SMB_VFS_GETXATTR(conn, fname,
 701                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 702                                        pai_buf, pai_buf_size);
 703
 704                 if (ret == -1) {
 705                         if (errno != ERANGE) {
 706                                 break;
 707                         }
 708                         /* Buffer too small - enlarge it. */
 709                         pai_buf_size *= 2;
 710                         TALLOC_FREE(pai_buf);
 711                         if (pai_buf_size > 1024*1024) {
 712                                 return NULL; /* Limit malloc to 1mb. */
 713                         }
 714                         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
 715                                 return NULL;
 716                 }
 717         } while (ret == -1);
 718
 719         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
 720
 721         if (ret == -1) {
 722                 /* No attribute or not supported. */
 723 #if defined(ENOATTR)
 724                 if (errno != ENOATTR)
 725                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 726 #else
 727                 if (errno != ENOSYS)
 728                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 729 #endif
 730                 TALLOC_FREE(pai_buf);
 731                 return NULL;
 732         }
 733
 734         paiv = create_pai_val(pai_buf, ret);
 735
 736         if (paiv) {
 737                 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
 738                         (unsigned int)paiv->sd_type,
 739                         fname));
 740         }
 741
 742         TALLOC_FREE(pai_buf);
 743         return paiv;
 744 }
 745
 746 /****************************************************************************
 747  Functions to manipulate the internal ACE format.
 748 ****************************************************************************/
 749
 750 /****************************************************************************
 751  Count a linked list of canonical ACE entries.
 752 ****************************************************************************/
 753
 754 static size_t count_canon_ace_list( canon_ace *l_head )
 755 {
 756         size_t count = 0;
 757         canon_ace *ace;
 758
 759         for (ace = l_head; ace; ace = ace->next)
 760                 count++;
 761
 762         return count;
 763 }
 764
 765 /****************************************************************************
 766  Free a linked list of canonical ACE entries.
 767 ****************************************************************************/
 768
 769 static void free_canon_ace_list( canon_ace *l_head )
 770 {
 771         canon_ace *list, *next;
 772
 773         for (list = l_head; list; list = next) {
 774                 next = list->next;
 775                 DLIST_REMOVE(l_head, list);
 776                 TALLOC_FREE(list);
 777         }
 778 }
 779
 780 /****************************************************************************
 781  Function to duplicate a canon_ace entry.
 782 ****************************************************************************/
 783
 784 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 785 {
 786         canon_ace *dst_ace = talloc(talloc_tos(), canon_ace);
 787
 788         if (dst_ace == NULL)
 789                 return NULL;
 790
 791         *dst_ace = *src_ace;
 792         dst_ace->prev = dst_ace->next = NULL;
 793         return dst_ace;
 794 }
 795
 796 /****************************************************************************
 797  Print out a canon ace.
 798 ****************************************************************************/
 799
 800 static void print_canon_ace(canon_ace *pace, int num)
 801 {
 802         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 803         dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
 804         if (pace->owner_type == UID_ACE) {
 805                 const char *u_name = uidtoname(pace->unix_ug.uid);
 806                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
 807         } else if (pace->owner_type == GID_ACE) {
 808                 char *g_name = gidtoname(pace->unix_ug.gid);
 809                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
 810         } else
 811                 dbgtext( "other ");
 812         switch (pace->type) {
 813                 case SMB_ACL_USER:
 814                         dbgtext( "SMB_ACL_USER ");
 815                         break;
 816                 case SMB_ACL_USER_OBJ:
 817                         dbgtext( "SMB_ACL_USER_OBJ ");
 818                         break;
 819                 case SMB_ACL_GROUP:
 820                         dbgtext( "SMB_ACL_GROUP ");
 821                         break;
 822                 case SMB_ACL_GROUP_OBJ:
 823                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 824                         break;
 825                 case SMB_ACL_OTHER:
 826                         dbgtext( "SMB_ACL_OTHER ");
 827                         break;
 828                 default:
 829                         dbgtext( "MASK " );
 830                         break;
 831         }
 832
 833         dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
 834         dbgtext( "perms ");
 835         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 836         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 837         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 838 }
 839
 840 /****************************************************************************
 841  Print out a canon ace list.
 842 ****************************************************************************/
 843
 844 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 845 {
 846         int count = 0;
 847
 848         if( DEBUGLVL( 10 )) {
 849                 dbgtext( "print_canon_ace_list: %s\n", name );
 850                 for (;ace_list; ace_list = ace_list->next, count++)
 851                         print_canon_ace(ace_list, count );
 852         }
 853 }
 854
 855 /****************************************************************************
 856  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 857 ****************************************************************************/
 858
 859 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
 860 {
 861         mode_t ret = 0;
 862
 863         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
 864         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 865         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 866
 867         return ret;
 868 }
 869
 870 /****************************************************************************
 871  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 872 ****************************************************************************/
 873
 874 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 875 {
 876         mode_t ret = 0;
 877
 878         if (mode & r_mask)
 879                 ret |= S_IRUSR;
 880         if (mode & w_mask)
 881                 ret |= S_IWUSR;
 882         if (mode & x_mask)
 883                 ret |= S_IXUSR;
 884
 885         return ret;
 886 }
 887
 888 /****************************************************************************
 889  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 890  an SMB_ACL_PERMSET_T.
 891 ****************************************************************************/
 892
 893 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 894 {
 895         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1)
 896                 return -1;
 897         if (mode & S_IRUSR) {
 898                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
 899                         return -1;
 900         }
 901         if (mode & S_IWUSR) {
 902                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
 903                         return -1;
 904         }
 905         if (mode & S_IXUSR) {
 906                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
 907                         return -1;
 908         }
 909         return 0;
 910 }
 911
 912 /****************************************************************************
 913  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 914 ****************************************************************************/
 915
 916 void create_file_sids(const SMB_STRUCT_STAT *psbuf, struct dom_sid *powner_sid, struct dom_sid *pgroup_sid)
 917 {
 918         uid_to_sid( powner_sid, psbuf->st_ex_uid );
 919         gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
 920 }
 921
 922 /****************************************************************************
 923  Merge aces with a common sid - if both are allow or deny, OR the permissions together and
 924  delete the second one. If the first is deny, mask the permissions off and delete the allow
 925  if the permissions become zero, delete the deny if the permissions are non zero.
 926 ****************************************************************************/
 927
 928 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
 929 {
 930         canon_ace *l_head = *pp_list_head;
 931         canon_ace *curr_ace_outer;
 932         canon_ace *curr_ace_outer_next;
 933
 934         /*
 935          * First, merge allow entries with identical SIDs, and deny entries
 936          * with identical SIDs.
 937          */
 938
 939         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 940                 canon_ace *curr_ace;
 941                 canon_ace *curr_ace_next;
 942
 943                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 944
 945                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 946                         bool can_merge = false;
 947
 948                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 949
 950                         /* For file ACLs we can merge if the SIDs and ALLOW/DENY
 951                          * types are the same. For directory acls we must also
 952                          * ensure the POSIX ACL types are the same. */
 953
 954                         if (!dir_acl) {
 955                                 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 956                                                 (curr_ace->attr == curr_ace_outer->attr));
 957                         } else {
 958                                 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 959                                                 (curr_ace->type == curr_ace_outer->type) &&
 960                                                 (curr_ace->attr == curr_ace_outer->attr));
 961                         }
 962
 963                         if (can_merge) {
 964                                 if( DEBUGLVL( 10 )) {
 965                                         dbgtext("merge_aces: Merging ACE's\n");
 966                                         print_canon_ace( curr_ace_outer, 0);
 967                                         print_canon_ace( curr_ace, 0);
 968                                 }
 969
 970                                 /* Merge two allow or two deny ACE's. */
 971
 972                                 /* Theoretically we shouldn't merge a dir ACE if
 973                                  * one ACE has the CI flag set, and the other
 974                                  * ACE has the OI flag set, but this is rare
 975                                  * enough we can ignore it. */
 976
 977                                 curr_ace_outer->perms |= curr_ace->perms;
 978                                 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
 979                                 DLIST_REMOVE(l_head, curr_ace);
 980                                 TALLOC_FREE(curr_ace);
 981                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 982                         }
 983                 }
 984         }
 985
 986         /*
 987          * Now go through and mask off allow permissions with deny permissions.
 988          * We can delete either the allow or deny here as we know that each SID
 989          * appears only once in the list.
 990          */
 991
 992         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 993                 canon_ace *curr_ace;
 994                 canon_ace *curr_ace_next;
 995
 996                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 997
 998                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 999
1000                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1001
1002                         /*
1003                          * Subtract ACE's with different entries. Due to the ordering constraints
1004                          * we've put on the ACL, we know the deny must be the first one.
1005                          */
1006
1007                         if (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1008                                 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1009
1010                                 if( DEBUGLVL( 10 )) {
1011                                         dbgtext("merge_aces: Masking ACE's\n");
1012                                         print_canon_ace( curr_ace_outer, 0);
1013                                         print_canon_ace( curr_ace, 0);
1014                                 }
1015
1016                                 curr_ace->perms &= ~curr_ace_outer->perms;
1017
1018                                 if (curr_ace->perms == 0) {
1019
1020                                         /*
1021                                          * The deny overrides the allow. Remove the allow.
1022                                          */
1023
1024                                         DLIST_REMOVE(l_head, curr_ace);
1025                                         TALLOC_FREE(curr_ace);
1026                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1027
1028                                 } else {
1029
1030                                         /*
1031                                          * Even after removing permissions, there
1032                                          * are still allow permissions - delete the deny.
1033                                          * It is safe to delete the deny here,
1034                                          * as we are guarenteed by the deny first
1035                                          * ordering that all the deny entries for
1036                                          * this SID have already been merged into one
1037                                          * before we can get to an allow ace.
1038                                          */
1039
1040                                         DLIST_REMOVE(l_head, curr_ace_outer);
1041                                         TALLOC_FREE(curr_ace_outer);
1042                                         break;
1043                                 }
1044                         }
1045
1046                 } /* end for curr_ace */
1047         } /* end for curr_ace_outer */
1048
1049         /* We may have modified the list. */
1050
1051         *pp_list_head = l_head;
1052 }
1053
1054 /****************************************************************************
1055  Check if we need to return NT4.x compatible ACL entries.
1056 ****************************************************************************/
1057
1058 bool nt4_compatible_acls(void)
1059 {
1060         int compat = lp_acl_compatibility();
1061
1062         if (compat == ACL_COMPAT_AUTO) {
1063                 enum remote_arch_types ra_type = get_remote_arch();
1064
1065                 /* Automatically adapt to client */
1066                 return (ra_type <= RA_WINNT);
1067         } else
1068                 return (compat == ACL_COMPAT_WINNT);
1069 }
1070
1071
1072 /****************************************************************************
1073  Map canon_ace perms to permission bits NT.
1074  The attr element is not used here - we only process deny entries on set,
1075  not get. Deny entries are implicit on get with ace->perms = 0.
1076 ****************************************************************************/
1077
1078 uint32_t map_canon_ace_perms(int snum,
1079                                 enum security_ace_type *pacl_type,
1080                                 mode_t perms,
1081                                 bool directory_ace)
1082 {
1083         uint32_t nt_mask = 0;
1084
1085         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1086
1087         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1088                 if (directory_ace) {
1089                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1090                 } else {
1091                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1092                 }
1093         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1094                 /*
1095                  * Windows NT refuses to display ACEs with no permissions in them (but
1096                  * they are perfectly legal with Windows 2000). If the ACE has empty
1097                  * permissions we cannot use 0, so we use the otherwise unused
1098                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1099                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1100                  * to be changed in the future.
1101                  */
1102
1103                 if (nt4_compatible_acls())
1104                         nt_mask = UNIX_ACCESS_NONE;
1105                 else
1106                         nt_mask = 0;
1107         } else {
1108                 if (directory_ace) {
1109                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1110                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1111                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1112                 } else {
1113                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1114                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1115                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1116                 }
1117         }
1118
1119         if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1120                 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1121         }
1122
1123         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1124                         (unsigned int)perms, (unsigned int)nt_mask ));
1125
1126         return nt_mask;
1127 }
1128
1129 /****************************************************************************
1130  Map NT perms to a UNIX mode_t.
1131 ****************************************************************************/
1132
1133 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1134 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1135 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1136
1137 static mode_t map_nt_perms( uint32 *mask, int type)
1138 {
1139         mode_t mode = 0;
1140
1141         switch(type) {
1142         case S_IRUSR:
1143                 if((*mask) & GENERIC_ALL_ACCESS)
1144                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1145                 else {
1146                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1147                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1148                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1149                 }
1150                 break;
1151         case S_IRGRP:
1152                 if((*mask) & GENERIC_ALL_ACCESS)
1153                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1154                 else {
1155                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1156                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1157                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1158                 }
1159                 break;
1160         case S_IROTH:
1161                 if((*mask) & GENERIC_ALL_ACCESS)
1162                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1163                 else {
1164                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1165                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1166                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1167                 }
1168                 break;
1169         }
1170
1171         return mode;
1172 }
1173
1174 /****************************************************************************
1175  Unpack a struct security_descriptor into a UNIX owner and group.
1176 ****************************************************************************/
1177
1178 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1179                         uid_t *puser, gid_t *pgrp,
1180                         uint32 security_info_sent, const struct
1181                         security_descriptor *psd)
1182 {
1183         struct dom_sid owner_sid;
1184         struct dom_sid grp_sid;
1185
1186         *puser = (uid_t)-1;
1187         *pgrp = (gid_t)-1;
1188
1189         if(security_info_sent == 0) {
1190                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1191                 return NT_STATUS_OK;
1192         }
1193
1194         /*
1195          * Validate the owner and group SID's.
1196          */
1197
1198         memset(&owner_sid, '\0', sizeof(owner_sid));
1199         memset(&grp_sid, '\0', sizeof(grp_sid));
1200
1201         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1202
1203         /*
1204          * Don't immediately fail if the owner sid cannot be validated.
1205          * This may be a group chown only set.
1206          */
1207
1208         if (security_info_sent & SECINFO_OWNER) {
1209                 sid_copy(&owner_sid, psd->owner_sid);
1210                 if (!sid_to_uid(&owner_sid, puser)) {
1211                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1212                                 /* this allows take ownership to work
1213                                  * reasonably */
1214                                 *puser = get_current_uid(conn);
1215                         } else {
1216                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1217                                          " owner sid for %s\n",
1218                                          sid_string_dbg(&owner_sid)));
1219                                 return NT_STATUS_INVALID_OWNER;
1220                         }
1221                 }
1222                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1223                          (unsigned int)*puser ));
1224         }
1225
1226         /*
1227          * Don't immediately fail if the group sid cannot be validated.
1228          * This may be an owner chown only set.
1229          */
1230
1231         if (security_info_sent & SECINFO_GROUP) {
1232                 sid_copy(&grp_sid, psd->group_sid);
1233                 if (!sid_to_gid( &grp_sid, pgrp)) {
1234                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1235                                 /* this allows take group ownership to work
1236                                  * reasonably */
1237                                 *pgrp = get_current_gid(conn);
1238                         } else {
1239                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1240                                          " group sid.\n"));
1241                                 return NT_STATUS_INVALID_OWNER;
1242                         }
1243                 }
1244                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1245                          (unsigned int)*pgrp));
1246         }
1247
1248         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1249
1250         return NT_STATUS_OK;
1251 }
1252
1253 /****************************************************************************
1254  Ensure the enforced permissions for this share apply.
1255 ****************************************************************************/
1256
1257 static void apply_default_perms(const struct share_params *params,
1258                                 const bool is_directory, canon_ace *pace,
1259                                 mode_t type)
1260 {
1261         mode_t and_bits = (mode_t)0;
1262         mode_t or_bits = (mode_t)0;
1263
1264         /* Get the initial bits to apply. */
1265
1266         if (is_directory) {
1267                 and_bits = lp_dir_security_mask(params->service);
1268                 or_bits = lp_force_dir_security_mode(params->service);
1269         } else {
1270                 and_bits = lp_security_mask(params->service);
1271                 or_bits = lp_force_security_mode(params->service);
1272         }
1273
1274         /* Now bounce them into the S_USR space. */
1275         switch(type) {
1276         case S_IRUSR:
1277                 /* Ensure owner has read access. */
1278                 pace->perms |= S_IRUSR;
1279                 if (is_directory)
1280                         pace->perms |= (S_IWUSR|S_IXUSR);
1281                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1282                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1283                 break;
1284         case S_IRGRP:
1285                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1286                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1287                 break;
1288         case S_IROTH:
1289                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1290                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1291                 break;
1292         }
1293
1294         pace->perms = ((pace->perms & and_bits)|or_bits);
1295 }
1296
1297 /****************************************************************************
1298  Check if a given uid/SID is in a group gid/SID. This is probably very
1299  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1300 ****************************************************************************/
1301
1302 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1303 {
1304         const char *u_name = NULL;
1305
1306         /* "Everyone" always matches every uid. */
1307
1308         if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1309                 return True;
1310
1311         /*
1312          * if it's the current user, we already have the unix token
1313          * and don't need to do the complex user_in_group_sid() call
1314          */
1315         if (uid_ace->unix_ug.uid == get_current_uid(conn)) {
1316                 const struct security_unix_token *curr_utok = NULL;
1317                 size_t i;
1318
1319                 if (group_ace->unix_ug.gid == get_current_gid(conn)) {
1320                         return True;
1321                 }
1322
1323                 curr_utok = get_current_utok(conn);
1324                 for (i=0; i < curr_utok->ngroups; i++) {
1325                         if (group_ace->unix_ug.gid == curr_utok->groups[i]) {
1326                                 return True;
1327                         }
1328                 }
1329         }
1330
1331         /* u_name talloc'ed off tos. */
1332         u_name = uidtoname(uid_ace->unix_ug.uid);
1333         if (!u_name) {
1334                 return False;
1335         }
1336
1337         /*
1338          * user_in_group_sid() uses create_token_from_username()
1339          * which creates an artificial NT token given just a username,
1340          * so this is not reliable for users from foreign domains
1341          * exported by winbindd!
1342          */
1343         return user_in_group_sid(u_name, &group_ace->trustee);
1344 }
1345
1346 /****************************************************************************
1347  A well formed POSIX file or default ACL has at least 3 entries, a
1348  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1349  In addition, the owner must always have at least read access.
1350  When using this call on get_acl, the pst struct is valid and contains
1351  the mode of the file. When using this call on set_acl, the pst struct has
1352  been modified to have a mode containing the default for this file or directory
1353  type.
1354 ****************************************************************************/
1355
1356 static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
1357                                      const struct share_params *params,
1358                                      const bool is_directory,
1359                                                         const struct dom_sid *pfile_owner_sid,
1360                                                         const struct dom_sid *pfile_grp_sid,
1361                                                         const SMB_STRUCT_STAT *pst,
1362                                                         bool setting_acl)
1363 {
1364         canon_ace *pace;
1365         bool got_user = False;
1366         bool got_grp = False;
1367         bool got_other = False;
1368         canon_ace *pace_other = NULL;
1369
1370         for (pace = *pp_ace; pace; pace = pace->next) {
1371                 if (pace->type == SMB_ACL_USER_OBJ) {
1372
1373                         if (setting_acl)
1374                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1375                         got_user = True;
1376
1377                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1378
1379                         /*
1380                          * Ensure create mask/force create mode is respected on set.
1381                          */
1382
1383                         if (setting_acl)
1384                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1385                         got_grp = True;
1386
1387                 } else if (pace->type == SMB_ACL_OTHER) {
1388
1389                         /*
1390                          * Ensure create mask/force create mode is respected on set.
1391                          */
1392
1393                         if (setting_acl)
1394                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1395                         got_other = True;
1396                         pace_other = pace;
1397                 }
1398         }
1399
1400         if (!got_user) {
1401                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1402                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1403                         return False;
1404                 }
1405
1406                 ZERO_STRUCTP(pace);
1407                 pace->type = SMB_ACL_USER_OBJ;
1408                 pace->owner_type = UID_ACE;
1409                 pace->unix_ug.uid = pst->st_ex_uid;
1410                 pace->trustee = *pfile_owner_sid;
1411                 pace->attr = ALLOW_ACE;
1412                 /* Start with existing permissions, principle of least
1413                    surprises for the user. */
1414                 pace->perms = pst->st_ex_mode;
1415
1416                 if (setting_acl) {
1417                         /* See if the owning user is in any of the other groups in
1418                            the ACE, or if there's a matching user entry.
1419                            If so, OR in the permissions from that entry. */
1420
1421                         canon_ace *pace_iter;
1422
1423                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1424                                 if (pace_iter->type == SMB_ACL_USER &&
1425                                                 pace_iter->unix_ug.uid == pace->unix_ug.uid) {
1426                                         pace->perms |= pace_iter->perms;
1427                                 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1428                                         if (uid_entry_in_group(conn, pace, pace_iter)) {
1429                                                 pace->perms |= pace_iter->perms;
1430                                         }
1431                                 }
1432                         }
1433
1434                         if (pace->perms == 0) {
1435                                 /* If we only got an "everyone" perm, just use that. */
1436                                 if (got_other)
1437                                         pace->perms = pace_other->perms;
1438                         }
1439
1440                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1441                 } else {
1442                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1443                 }
1444
1445                 DLIST_ADD(*pp_ace, pace);
1446         }
1447
1448         if (!got_grp) {
1449                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1450                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1451                         return False;
1452                 }
1453
1454                 ZERO_STRUCTP(pace);
1455                 pace->type = SMB_ACL_GROUP_OBJ;
1456                 pace->owner_type = GID_ACE;
1457                 pace->unix_ug.uid = pst->st_ex_gid;
1458                 pace->trustee = *pfile_grp_sid;
1459                 pace->attr = ALLOW_ACE;
1460                 if (setting_acl) {
1461                         /* If we only got an "everyone" perm, just use that. */
1462                         if (got_other)
1463                                 pace->perms = pace_other->perms;
1464                         else
1465                                 pace->perms = 0;
1466                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1467                 } else {
1468                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1469                 }
1470
1471                 DLIST_ADD(*pp_ace, pace);
1472         }
1473
1474         if (!got_other) {
1475                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1476                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1477                         return False;
1478                 }
1479
1480                 ZERO_STRUCTP(pace);
1481                 pace->type = SMB_ACL_OTHER;
1482                 pace->owner_type = WORLD_ACE;
1483                 pace->unix_ug.world = -1;
1484                 pace->trustee = global_sid_World;
1485                 pace->attr = ALLOW_ACE;
1486                 if (setting_acl) {
1487                         pace->perms = 0;
1488                         apply_default_perms(params, is_directory, pace, S_IROTH);
1489                 } else
1490                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1491
1492                 DLIST_ADD(*pp_ace, pace);
1493         }
1494
1495         return True;
1496 }
1497
1498 /****************************************************************************
1499  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1500  If it does not have them, check if there are any entries where the trustee is the
1501  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1502  Note we must not do this to default directory ACLs.
1503 ****************************************************************************/
1504
1505 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1506 {
1507         bool got_user_obj, got_group_obj;
1508         canon_ace *current_ace;
1509         int i, entries;
1510
1511         entries = count_canon_ace_list(ace);
1512         got_user_obj = False;
1513         got_group_obj = False;
1514
1515         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1516                 if (current_ace->type == SMB_ACL_USER_OBJ)
1517                         got_user_obj = True;
1518                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1519                         got_group_obj = True;
1520         }
1521         if (got_user_obj && got_group_obj) {
1522                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1523                 return;
1524         }
1525
1526         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1527                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1528                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1529                         current_ace->type = SMB_ACL_USER_OBJ;
1530                         got_user_obj = True;
1531                 }
1532                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1533                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1534                         current_ace->type = SMB_ACL_GROUP_OBJ;
1535                         got_group_obj = True;
1536                 }
1537         }
1538         if (!got_user_obj)
1539                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1540         if (!got_group_obj)
1541                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1542 }
1543
1544 /****************************************************************************
1545  Unpack a struct security_descriptor into two canonical ace lists.
1546 ****************************************************************************/
1547
1548 static bool create_canon_ace_lists(files_struct *fsp,
1549                                         const SMB_STRUCT_STAT *pst,
1550                                         struct dom_sid *pfile_owner_sid,
1551                                         struct dom_sid *pfile_grp_sid,
1552                                         canon_ace **ppfile_ace,
1553                                         canon_ace **ppdir_ace,
1554                                         const struct security_acl *dacl)
1555 {
1556         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1557         canon_ace *file_ace = NULL;
1558         canon_ace *dir_ace = NULL;
1559         canon_ace *current_ace = NULL;
1560         bool got_dir_allow = False;
1561         bool got_file_allow = False;
1562         int i, j;
1563
1564         *ppfile_ace = NULL;
1565         *ppdir_ace = NULL;
1566
1567         /*
1568          * Convert the incoming ACL into a more regular form.
1569          */
1570
1571         for(i = 0; i < dacl->num_aces; i++) {
1572                 struct security_ace *psa = &dacl->aces[i];
1573
1574                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1575                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1576                         return False;
1577                 }
1578
1579                 if (nt4_compatible_acls()) {
1580                         /*
1581                          * The security mask may be UNIX_ACCESS_NONE which should map into
1582                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1583                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1584                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1585                          */
1586
1587                         /*
1588                          * Convert GENERIC bits to specific bits.
1589                          */
1590
1591                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1592
1593                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1594
1595                         if(psa->access_mask != UNIX_ACCESS_NONE)
1596                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1597                 }
1598         }
1599
1600         /*
1601          * Deal with the fact that NT 4.x re-writes the canonical format
1602          * that we return for default ACLs. If a directory ACE is identical
1603          * to a inherited directory ACE then NT changes the bits so that the
1604          * first ACE is set to OI|IO and the second ACE for this SID is set
1605          * to CI. We need to repair this. JRA.
1606          */
1607
1608         for(i = 0; i < dacl->num_aces; i++) {
1609                 struct security_ace *psa1 = &dacl->aces[i];
1610
1611                 for (j = i + 1; j < dacl->num_aces; j++) {
1612                         struct security_ace *psa2 = &dacl->aces[j];
1613
1614                         if (psa1->access_mask != psa2->access_mask)
1615                                 continue;
1616
1617                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1618                                 continue;
1619
1620                         /*
1621                          * Ok - permission bits and SIDs are equal.
1622                          * Check if flags were re-written.
1623                          */
1624
1625                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1626
1627                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1628                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1629
1630                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1631
1632                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1633                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1634
1635                         }
1636                 }
1637         }
1638
1639         for(i = 0; i < dacl->num_aces; i++) {
1640                 struct security_ace *psa = &dacl->aces[i];
1641
1642                 /*
1643                  * Create a canon_ace entry representing this NT DACL ACE.
1644                  */
1645
1646                 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1647                         free_canon_ace_list(file_ace);
1648                         free_canon_ace_list(dir_ace);
1649                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1650                         return False;
1651                 }
1652
1653                 ZERO_STRUCTP(current_ace);
1654
1655                 sid_copy(&current_ace->trustee, &psa->trustee);
1656
1657                 /*
1658                  * Try and work out if the SID is a user or group
1659                  * as we need to flag these differently for POSIX.
1660                  * Note what kind of a POSIX ACL this should map to.
1661                  */
1662
1663                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1664                         current_ace->owner_type = WORLD_ACE;
1665                         current_ace->unix_ug.world = -1;
1666                         current_ace->type = SMB_ACL_OTHER;
1667                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1668                         current_ace->owner_type = UID_ACE;
1669                         current_ace->unix_ug.uid = pst->st_ex_uid;
1670                         current_ace->type = SMB_ACL_USER_OBJ;
1671
1672                         /*
1673                          * The Creator Owner entry only specifies inheritable permissions,
1674                          * never access permissions. WinNT doesn't always set the ACE to
1675                          * INHERIT_ONLY, though.
1676                          */
1677
1678                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1679
1680                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1681                         current_ace->owner_type = GID_ACE;
1682                         current_ace->unix_ug.gid = pst->st_ex_gid;
1683                         current_ace->type = SMB_ACL_GROUP_OBJ;
1684
1685                         /*
1686                          * The Creator Group entry only specifies inheritable permissions,
1687                          * never access permissions. WinNT doesn't always set the ACE to
1688                          * INHERIT_ONLY, though.
1689                          */
1690                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1691
1692                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1693                         current_ace->owner_type = UID_ACE;
1694                         /* If it's the owning user, this is a user_obj, not
1695                          * a user. */
1696                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1697                                 current_ace->type = SMB_ACL_USER_OBJ;
1698                         } else {
1699                                 current_ace->type = SMB_ACL_USER;
1700                         }
1701                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1702                         current_ace->owner_type = GID_ACE;
1703                         /* If it's the primary group, this is a group_obj, not
1704                          * a group. */
1705                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1706                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1707                         } else {
1708                                 current_ace->type = SMB_ACL_GROUP;
1709                         }
1710                 } else {
1711                         /*
1712                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1713                          */
1714
1715                         if (non_mappable_sid(&psa->trustee)) {
1716                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1717                                            "non-mappable SID %s\n",
1718                                            sid_string_dbg(&psa->trustee)));
1719                                 TALLOC_FREE(current_ace);
1720                                 continue;
1721                         }
1722
1723                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1724                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1725                                         "unknown or foreign SID %s\n",
1726                                         sid_string_dbg(&psa->trustee)));
1727                                 TALLOC_FREE(current_ace);
1728                                 continue;
1729                         }
1730
1731                         free_canon_ace_list(file_ace);
1732                         free_canon_ace_list(dir_ace);
1733                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1734                                   "%s to uid or gid.\n",
1735                                   sid_string_dbg(&current_ace->trustee)));
1736                         TALLOC_FREE(current_ace);
1737                         return False;
1738                 }
1739
1740                 /*
1741                  * Map the given NT permissions into a UNIX mode_t containing only
1742                  * S_I(R|W|X)USR bits.
1743                  */
1744
1745                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1746                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1747
1748                 /* Store the ace_flag. */
1749                 current_ace->ace_flags = psa->flags;
1750
1751                 /*
1752                  * Now add the created ace to either the file list, the directory
1753                  * list, or both. We *MUST* preserve the order here (hence we use
1754                  * DLIST_ADD_END) as NT ACLs are order dependent.
1755                  */
1756
1757                 if (fsp->is_directory) {
1758
1759                         /*
1760                          * We can only add to the default POSIX ACE list if the ACE is
1761                          * designed to be inherited by both files and directories.
1762                          */
1763
1764                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1765                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1766
1767                                 canon_ace *current_dir_ace = current_ace;
1768                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1769
1770                                 /*
1771                                  * Note if this was an allow ace. We can't process
1772                                  * any further deny ace's after this.
1773                                  */
1774
1775                                 if (current_ace->attr == ALLOW_ACE)
1776                                         got_dir_allow = True;
1777
1778                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1779                                         DEBUG(0,("create_canon_ace_lists: "
1780                                                  "malformed ACL in "
1781                                                  "inheritable ACL! Deny entry "
1782                                                  "after Allow entry. Failing "
1783                                                  "to set on file %s.\n",
1784                                                  fsp_str_dbg(fsp)));
1785                                         free_canon_ace_list(file_ace);
1786                                         free_canon_ace_list(dir_ace);
1787                                         return False;
1788                                 }
1789
1790                                 if( DEBUGLVL( 10 )) {
1791                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1792                                         print_canon_ace( current_ace, 0);
1793                                 }
1794
1795                                 /*
1796                                  * If this is not an inherit only ACE we need to add a duplicate
1797                                  * to the file acl.
1798                                  */
1799
1800                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1801                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1802
1803                                         if (!dup_ace) {
1804                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1805                                                 free_canon_ace_list(file_ace);
1806                                                 free_canon_ace_list(dir_ace);
1807                                                 return False;
1808                                         }
1809
1810                                         /*
1811                                          * We must not free current_ace here as its
1812                                          * pointer is now owned by the dir_ace list.
1813                                          */
1814                                         current_ace = dup_ace;
1815                                         /* We've essentially split this ace into two,
1816                                          * and added the ace with inheritance request
1817                                          * bits to the directory ACL. Drop those bits for
1818                                          * the ACE we're adding to the file list. */
1819                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1820                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1821                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1822                                 } else {
1823                                         /*
1824                                          * We must not free current_ace here as its
1825                                          * pointer is now owned by the dir_ace list.
1826                                          */
1827                                         current_ace = NULL;
1828                                 }
1829
1830                                 /*
1831                                  * current_ace is now either owned by file_ace
1832                                  * or is NULL. We can safely operate on current_dir_ace
1833                                  * to treat mapping for default acl entries differently
1834                                  * than access acl entries.
1835                                  */
1836
1837                                 if (current_dir_ace->owner_type == UID_ACE) {
1838                                         /*
1839                                          * We already decided above this is a uid,
1840                                          * for default acls ace's only CREATOR_OWNER
1841                                          * maps to ACL_USER_OBJ. All other uid
1842                                          * ace's are ACL_USER.
1843                                          */
1844                                         if (dom_sid_equal(&current_dir_ace->trustee,
1845                                                         &global_sid_Creator_Owner)) {
1846                                                 current_dir_ace->type = SMB_ACL_USER_OBJ;
1847                                         } else {
1848                                                 current_dir_ace->type = SMB_ACL_USER;
1849                                         }
1850                                 }
1851
1852                                 if (current_dir_ace->owner_type == GID_ACE) {
1853                                         /*
1854                                          * We already decided above this is a gid,
1855                                          * for default acls ace's only CREATOR_GROUP
1856                                          * maps to ACL_GROUP_OBJ. All other uid
1857                                          * ace's are ACL_GROUP.
1858                                          */
1859                                         if (dom_sid_equal(&current_dir_ace->trustee,
1860                                                         &global_sid_Creator_Group)) {
1861                                                 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1862                                         } else {
1863                                                 current_dir_ace->type = SMB_ACL_GROUP;
1864                                         }
1865                                 }
1866                         }
1867                 }
1868
1869                 /*
1870                  * Only add to the file ACL if not inherit only.
1871                  */
1872
1873                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1874                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1875
1876                         /*
1877                          * Note if this was an allow ace. We can't process
1878                          * any further deny ace's after this.
1879                          */
1880
1881                         if (current_ace->attr == ALLOW_ACE)
1882                                 got_file_allow = True;
1883
1884                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1885                                 DEBUG(0,("create_canon_ace_lists: malformed "
1886                                          "ACL in file ACL ! Deny entry after "
1887                                          "Allow entry. Failing to set on file "
1888                                          "%s.\n", fsp_str_dbg(fsp)));
1889                                 free_canon_ace_list(file_ace);
1890                                 free_canon_ace_list(dir_ace);
1891                                 return False;
1892                         }
1893
1894                         if( DEBUGLVL( 10 )) {
1895                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1896                                 print_canon_ace( current_ace, 0);
1897                         }
1898                         all_aces_are_inherit_only = False;
1899                         /*
1900                          * We must not free current_ace here as its
1901                          * pointer is now owned by the file_ace list.
1902                          */
1903                         current_ace = NULL;
1904                 }
1905
1906                 /*
1907                  * Free if ACE was not added.
1908                  */
1909
1910                 TALLOC_FREE(current_ace);
1911         }
1912
1913         if (fsp->is_directory && all_aces_are_inherit_only) {
1914                 /*
1915                  * Windows 2000 is doing one of these weird 'inherit acl'
1916                  * traverses to conserve NTFS ACL resources. Just pretend
1917                  * there was no DACL sent. JRA.
1918                  */
1919
1920                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1921                 free_canon_ace_list(file_ace);
1922                 free_canon_ace_list(dir_ace);
1923                 file_ace = NULL;
1924                 dir_ace = NULL;
1925         } else {
1926                 /*
1927                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
1928                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1929                  * entries can be converted to *_OBJ. Don't do this for the default
1930                  * ACL, we will create them separately for this if needed inside
1931                  * ensure_canon_entry_valid().
1932                  */
1933                 if (file_ace) {
1934                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1935                 }
1936         }
1937
1938         *ppfile_ace = file_ace;
1939         *ppdir_ace = dir_ace;
1940
1941         return True;
1942 }
1943
1944 /****************************************************************************
1945  ASCII art time again... JRA :-).
1946
1947  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1948  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1949  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1950  allow or deny have been merged, so the same SID can only appear once in the deny
1951  list or once in the allow list.
1952
1953  We then process as follows :
1954
1955  ---------------------------------------------------------------------------
1956  First pass - look for a Everyone DENY entry.
1957
1958  If it is deny all (rwx) trunate the list at this point.
1959  Else, walk the list from this point and use the deny permissions of this
1960  entry as a mask on all following allow entries. Finally, delete
1961  the Everyone DENY entry (we have applied it to everything possible).
1962
1963  In addition, in this pass we remove any DENY entries that have
1964  no permissions (ie. they are a DENY nothing).
1965  ---------------------------------------------------------------------------
1966  Second pass - only deal with deny user entries.
1967
1968  DENY user1 (perms XXX)
1969
1970  new_perms = 0
1971  for all following allow group entries where user1 is in group
1972         new_perms |= group_perms;
1973
1974  user1 entry perms = new_perms & ~ XXX;
1975
1976  Convert the deny entry to an allow entry with the new perms and
1977  push to the end of the list. Note if the user was in no groups
1978  this maps to a specific allow nothing entry for this user.
1979
1980  The common case from the NT ACL choser (userX deny all) is
1981  optimised so we don't do the group lookup - we just map to
1982  an allow nothing entry.
1983
1984  What we're doing here is inferring the allow permissions the
1985  person setting the ACE on user1 wanted by looking at the allow
1986  permissions on the groups the user is currently in. This will
1987  be a snapshot, depending on group membership but is the best
1988  we can do and has the advantage of failing closed rather than
1989  open.
1990  ---------------------------------------------------------------------------
1991  Third pass - only deal with deny group entries.
1992
1993  DENY group1 (perms XXX)
1994
1995  for all following allow user entries where user is in group1
1996    user entry perms = user entry perms & ~ XXX;
1997
1998  If there is a group Everyone allow entry with permissions YYY,
1999  convert the group1 entry to an allow entry and modify its
2000  permissions to be :
2001
2002  new_perms = YYY & ~ XXX
2003
2004  and push to the end of the list.
2005
2006  If there is no group Everyone allow entry then convert the
2007  group1 entry to a allow nothing entry and push to the end of the list.
2008
2009  Note that the common case from the NT ACL choser (groupX deny all)
2010  cannot be optimised here as we need to modify user entries who are
2011  in the group to change them to a deny all also.
2012
2013  What we're doing here is modifying the allow permissions of
2014  user entries (which are more specific in POSIX ACLs) to mask
2015  out the explicit deny set on the group they are in. This will
2016  be a snapshot depending on current group membership but is the
2017  best we can do and has the advantage of failing closed rather
2018  than open.
2019  ---------------------------------------------------------------------------
2020  Fourth pass - cope with cumulative permissions.
2021
2022  for all allow user entries, if there exists an allow group entry with
2023  more permissive permissions, and the user is in that group, rewrite the
2024  allow user permissions to contain both sets of permissions.
2025
2026  Currently the code for this is #ifdef'ed out as these semantics make
2027  no sense to me. JRA.
2028  ---------------------------------------------------------------------------
2029
2030  Note we *MUST* do the deny user pass first as this will convert deny user
2031  entries into allow user entries which can then be processed by the deny
2032  group pass.
2033
2034  The above algorithm took a *lot* of thinking about - hence this
2035  explaination :-). JRA.
2036 ****************************************************************************/
2037
2038 /****************************************************************************
2039  Process a canon_ace list entries. This is very complex code. We need
2040  to go through and remove the "deny" permissions from any allow entry that matches
2041  the id of this entry. We have already refused any NT ACL that wasn't in correct
2042  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2043  we just remove it (to fail safe). We have already removed any duplicate ace
2044  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2045  allow entries.
2046 ****************************************************************************/
2047
2048 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2049 {
2050         canon_ace *ace_list = *pp_ace_list;
2051         canon_ace *curr_ace = NULL;
2052         canon_ace *curr_ace_next = NULL;
2053
2054         /* Pass 1 above - look for an Everyone, deny entry. */
2055
2056         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2057                 canon_ace *allow_ace_p;
2058
2059                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2060
2061                 if (curr_ace->attr != DENY_ACE)
2062                         continue;
2063
2064                 if (curr_ace->perms == (mode_t)0) {
2065
2066                         /* Deny nothing entry - delete. */
2067
2068                         DLIST_REMOVE(ace_list, curr_ace);
2069                         continue;
2070                 }
2071
2072                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2073                         continue;
2074
2075                 /* JRATEST - assert. */
2076                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2077
2078                 if (curr_ace->perms == ALL_ACE_PERMS) {
2079
2080                         /*
2081                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2082                          * list at this point including this entry.
2083                          */
2084
2085                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2086
2087                         free_canon_ace_list( curr_ace );
2088                         if (prev_entry)
2089                                 DLIST_REMOVE(ace_list, prev_entry);
2090                         else {
2091                                 /* We deleted the entire list. */
2092                                 ace_list = NULL;
2093                         }
2094                         break;
2095                 }
2096
2097                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2098
2099                         /*
2100                          * Only mask off allow entries.
2101                          */
2102
2103                         if (allow_ace_p->attr != ALLOW_ACE)
2104                                 continue;
2105
2106                         allow_ace_p->perms &= ~curr_ace->perms;
2107                 }
2108
2109                 /*
2110                  * Now it's been applied, remove it.
2111                  */
2112
2113                 DLIST_REMOVE(ace_list, curr_ace);
2114         }
2115
2116         /* Pass 2 above - deal with deny user entries. */
2117
2118         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2119                 mode_t new_perms = (mode_t)0;
2120                 canon_ace *allow_ace_p;
2121
2122                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2123
2124                 if (curr_ace->attr != DENY_ACE)
2125                         continue;
2126
2127                 if (curr_ace->owner_type != UID_ACE)
2128                         continue;
2129
2130                 if (curr_ace->perms == ALL_ACE_PERMS) {
2131
2132                         /*
2133                          * Optimisation - this is a deny everything to this user.
2134                          * Convert to an allow nothing and push to the end of the list.
2135                          */
2136
2137                         curr_ace->attr = ALLOW_ACE;
2138                         curr_ace->perms = (mode_t)0;
2139                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2140                         continue;
2141                 }
2142
2143                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2144
2145                         if (allow_ace_p->attr != ALLOW_ACE)
2146                                 continue;
2147
2148                         /* We process GID_ACE and WORLD_ACE entries only. */
2149
2150                         if (allow_ace_p->owner_type == UID_ACE)
2151                                 continue;
2152
2153                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2154                                 new_perms |= allow_ace_p->perms;
2155                 }
2156
2157                 /*
2158                  * Convert to a allow entry, modify the perms and push to the end
2159                  * of the list.
2160                  */
2161
2162                 curr_ace->attr = ALLOW_ACE;
2163                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2164                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2165         }
2166
2167         /* Pass 3 above - deal with deny group entries. */
2168
2169         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2170                 canon_ace *allow_ace_p;
2171                 canon_ace *allow_everyone_p = NULL;
2172
2173                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2174
2175                 if (curr_ace->attr != DENY_ACE)
2176                         continue;
2177
2178                 if (curr_ace->owner_type != GID_ACE)
2179                         continue;
2180
2181                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2182
2183                         if (allow_ace_p->attr != ALLOW_ACE)
2184                                 continue;
2185
2186                         /* Store a pointer to the Everyone allow, if it exists. */
2187                         if (allow_ace_p->owner_type == WORLD_ACE)
2188                                 allow_everyone_p = allow_ace_p;
2189
2190                         /* We process UID_ACE entries only. */
2191
2192                         if (allow_ace_p->owner_type != UID_ACE)
2193                                 continue;
2194
2195                         /* Mask off the deny group perms. */
2196
2197                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2198                                 allow_ace_p->perms &= ~curr_ace->perms;
2199                 }
2200
2201                 /*
2202                  * Convert the deny to an allow with the correct perms and
2203                  * push to the end of the list.
2204                  */
2205
2206                 curr_ace->attr = ALLOW_ACE;
2207                 if (allow_everyone_p)
2208                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2209                 else
2210                         curr_ace->perms = (mode_t)0;
2211                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2212         }
2213
2214         /* Doing this fourth pass allows Windows semantics to be layered
2215          * on top of POSIX semantics. I'm not sure if this is desirable.
2216          * For example, in W2K ACLs there is no way to say, "Group X no
2217          * access, user Y full access" if user Y is a member of group X.
2218          * This seems completely broken semantics to me.... JRA.
2219          */
2220
2221 #if 0
2222         /* Pass 4 above - deal with allow entries. */
2223
2224         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2225                 canon_ace *allow_ace_p;
2226
2227                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2228
2229                 if (curr_ace->attr != ALLOW_ACE)
2230                         continue;
2231
2232                 if (curr_ace->owner_type != UID_ACE)
2233                         continue;
2234
2235                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2236
2237                         if (allow_ace_p->attr != ALLOW_ACE)
2238                                 continue;
2239
2240                         /* We process GID_ACE entries only. */
2241
2242                         if (allow_ace_p->owner_type != GID_ACE)
2243                                 continue;
2244
2245                         /* OR in the group perms. */
2246
2247                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2248                                 curr_ace->perms |= allow_ace_p->perms;
2249                 }
2250         }
2251 #endif
2252
2253         *pp_ace_list = ace_list;
2254 }
2255
2256 /****************************************************************************
2257  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2258  succeeding.
2259 ****************************************************************************/
2260
2261 static bool unpack_canon_ace(files_struct *fsp,
2262                                 const SMB_STRUCT_STAT *pst,
2263                                 struct dom_sid *pfile_owner_sid,
2264                                 struct dom_sid *pfile_grp_sid,
2265                                 canon_ace **ppfile_ace,
2266                                 canon_ace **ppdir_ace,
2267                                 uint32 security_info_sent,
2268                                 const struct security_descriptor *psd)
2269 {
2270         canon_ace *file_ace = NULL;
2271         canon_ace *dir_ace = NULL;
2272
2273         *ppfile_ace = NULL;
2274         *ppdir_ace = NULL;
2275
2276         if(security_info_sent == 0) {
2277                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2278                 return False;
2279         }
2280
2281         /*
2282          * If no DACL then this is a chown only security descriptor.
2283          */
2284
2285         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2286                 return True;
2287
2288         /*
2289          * Now go through the DACL and create the canon_ace lists.
2290          */
2291
2292         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2293                                                                 &file_ace, &dir_ace, psd->dacl))
2294                 return False;
2295
2296         if ((file_ace == NULL) && (dir_ace == NULL)) {
2297                 /* W2K traverse DACL set - ignore. */
2298                 return True;
2299         }
2300
2301         /*
2302          * Go through the canon_ace list and merge entries
2303          * belonging to identical users of identical allow or deny type.
2304          * We can do this as all deny entries come first, followed by
2305          * all allow entries (we have mandated this before accepting this acl).
2306          */
2307
2308         print_canon_ace_list( "file ace - before merge", file_ace);
2309         merge_aces( &file_ace, false);
2310
2311         print_canon_ace_list( "dir ace - before merge", dir_ace);
2312         merge_aces( &dir_ace, true);
2313
2314         /*
2315          * NT ACLs are order dependent. Go through the acl lists and
2316          * process DENY entries by masking the allow entries.
2317          */
2318
2319         print_canon_ace_list( "file ace - before deny", file_ace);
2320         process_deny_list(fsp->conn, &file_ace);
2321
2322         print_canon_ace_list( "dir ace - before deny", dir_ace);
2323         process_deny_list(fsp->conn, &dir_ace);
2324
2325         /*
2326          * A well formed POSIX file or default ACL has at least 3 entries, a
2327          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2328          * and optionally a mask entry. Ensure this is the case.
2329          */
2330
2331         print_canon_ace_list( "file ace - before valid", file_ace);
2332
2333         if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2334                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2335                 free_canon_ace_list(file_ace);
2336                 free_canon_ace_list(dir_ace);
2337                 return False;
2338         }
2339
2340         print_canon_ace_list( "dir ace - before valid", dir_ace);
2341
2342         if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2343                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2344                 free_canon_ace_list(file_ace);
2345                 free_canon_ace_list(dir_ace);
2346                 return False;
2347         }
2348
2349         print_canon_ace_list( "file ace - return", file_ace);
2350         print_canon_ace_list( "dir ace - return", dir_ace);
2351
2352         *ppfile_ace = file_ace;
2353         *ppdir_ace = dir_ace;
2354         return True;
2355
2356 }
2357
2358 /******************************************************************************
2359  When returning permissions, try and fit NT display
2360  semantics if possible. Note the the canon_entries here must have been malloced.
2361  The list format should be - first entry = owner, followed by group and other user
2362  entries, last entry = other.
2363
2364  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2365  are not ordered, and match on the most specific entry rather than walking a list,
2366  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2367
2368  Entry 0: owner : deny all except read and write.
2369  Entry 1: owner : allow read and write.
2370  Entry 2: group : deny all except read.
2371  Entry 3: group : allow read.
2372  Entry 4: Everyone : allow read.
2373
2374  But NT cannot display this in their ACL editor !
2375 ********************************************************************************/
2376
2377 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2378 {
2379         canon_ace *l_head = *pp_list_head;
2380         canon_ace *owner_ace = NULL;
2381         canon_ace *other_ace = NULL;
2382         canon_ace *ace = NULL;
2383
2384         for (ace = l_head; ace; ace = ace->next) {
2385                 if (ace->type == SMB_ACL_USER_OBJ)
2386                         owner_ace = ace;
2387                 else if (ace->type == SMB_ACL_OTHER) {
2388                         /* Last ace - this is "other" */
2389                         other_ace = ace;
2390                 }
2391         }
2392
2393         if (!owner_ace || !other_ace) {
2394                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2395                         filename ));
2396                 return;
2397         }
2398
2399         /*
2400          * The POSIX algorithm applies to owner first, and other last,
2401          * so ensure they are arranged in this order.
2402          */
2403
2404         if (owner_ace) {
2405                 DLIST_PROMOTE(l_head, owner_ace);
2406         }
2407
2408         if (other_ace) {
2409                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2410         }
2411
2412         /* We have probably changed the head of the list. */
2413
2414         *pp_list_head = l_head;
2415 }
2416
2417 /****************************************************************************
2418  Create a linked list of canonical ACE entries.
2419 ****************************************************************************/
2420
2421 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2422                                    const char *fname, SMB_ACL_T posix_acl,
2423                                    const SMB_STRUCT_STAT *psbuf,
2424                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2425 {
2426         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2427         canon_ace *l_head = NULL;
2428         canon_ace *ace = NULL;
2429         canon_ace *next_ace = NULL;
2430         int entry_id = SMB_ACL_FIRST_ENTRY;
2431         SMB_ACL_ENTRY_T entry;
2432         size_t ace_count;
2433
2434         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2435                 SMB_ACL_TAG_T tagtype;
2436                 SMB_ACL_PERMSET_T permset;
2437                 struct dom_sid sid;
2438                 posix_id unix_ug;
2439                 enum ace_owner owner_type;
2440
2441                 entry_id = SMB_ACL_NEXT_ENTRY;
2442
2443                 /* Is this a MASK entry ? */
2444                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2445                         continue;
2446
2447                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2448                         continue;
2449
2450                 /* Decide which SID to use based on the ACL type. */
2451                 switch(tagtype) {
2452                         case SMB_ACL_USER_OBJ:
2453                                 /* Get the SID from the owner. */
2454                                 sid_copy(&sid, powner);
2455                                 unix_ug.uid = psbuf->st_ex_uid;
2456                                 owner_type = UID_ACE;
2457                                 break;
2458                         case SMB_ACL_USER:
2459                                 {
2460                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2461                                         if (puid == NULL) {
2462                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2463                                                 continue;
2464                                         }
2465                                         uid_to_sid( &sid, *puid);
2466                                         unix_ug.uid = *puid;
2467                                         owner_type = UID_ACE;
2468                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2469                                         break;
2470                                 }
2471                         case SMB_ACL_GROUP_OBJ:
2472                                 /* Get the SID from the owning group. */
2473                                 sid_copy(&sid, pgroup);
2474                                 unix_ug.gid = psbuf->st_ex_gid;
2475                                 owner_type = GID_ACE;
2476                                 break;
2477                         case SMB_ACL_GROUP:
2478                                 {
2479                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2480                                         if (pgid == NULL) {
2481                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2482                                                 continue;
2483                                         }
2484                                         gid_to_sid( &sid, *pgid);
2485                                         unix_ug.gid = *pgid;
2486                                         owner_type = GID_ACE;
2487                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2488                                         break;
2489                                 }
2490                         case SMB_ACL_MASK:
2491                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2492                                 continue; /* Don't count the mask as an entry. */
2493                         case SMB_ACL_OTHER:
2494                                 /* Use the Everyone SID */
2495                                 sid = global_sid_World;
2496                                 unix_ug.world = -1;
2497                                 owner_type = WORLD_ACE;
2498                                 break;
2499                         default:
2500                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2501                                 continue;
2502                 }
2503
2504                 /*
2505                  * Add this entry to the list.
2506                  */
2507
2508                 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2509                         goto fail;
2510
2511                 ZERO_STRUCTP(ace);
2512                 ace->type = tagtype;
2513                 ace->perms = convert_permset_to_mode_t(conn, permset);
2514                 ace->attr = ALLOW_ACE;
2515                 ace->trustee = sid;
2516                 ace->unix_ug = unix_ug;
2517                 ace->owner_type = owner_type;
2518                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2519
2520                 DLIST_ADD(l_head, ace);
2521         }
2522
2523         /*
2524          * This next call will ensure we have at least a user/group/world set.
2525          */
2526
2527         if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2528                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2529                                       psbuf, False))
2530                 goto fail;
2531
2532         /*
2533          * Now go through the list, masking the permissions with the
2534          * acl_mask. Ensure all DENY Entries are at the start of the list.
2535          */
2536
2537         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2538
2539         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2540                 next_ace = ace->next;
2541
2542                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2543                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2544                         ace->perms &= acl_mask;
2545
2546                 if (ace->perms == 0) {
2547                         DLIST_PROMOTE(l_head, ace);
2548                 }
2549
2550                 if( DEBUGLVL( 10 ) ) {
2551                         print_canon_ace(ace, ace_count);
2552                 }
2553         }
2554
2555         arrange_posix_perms(fname,&l_head );
2556
2557         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2558
2559         return l_head;
2560
2561   fail:
2562
2563         free_canon_ace_list(l_head);
2564         return NULL;
2565 }
2566
2567 /****************************************************************************
2568  Check if the current user group list contains a given group.
2569 ****************************************************************************/
2570
2571 bool current_user_in_group(connection_struct *conn, gid_t gid)
2572 {
2573         int i;
2574         const struct security_unix_token *utok = get_current_utok(conn);
2575
2576         for (i = 0; i < utok->ngroups; i++) {
2577                 if (utok->groups[i] == gid) {
2578                         return True;
2579                 }
2580         }
2581
2582         return False;
2583 }
2584
2585 /****************************************************************************
2586  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2587 ****************************************************************************/
2588
2589 static bool acl_group_override(connection_struct *conn,
2590                                const struct smb_filename *smb_fname)
2591 {
2592         if ((errno != EPERM) && (errno != EACCES)) {
2593                 return false;
2594         }
2595
2596         /* file primary group == user primary or supplementary group */
2597         if (lp_acl_group_control(SNUM(conn)) &&
2598             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2599                 return true;
2600         }
2601
2602         /* user has writeable permission */
2603         if (lp_dos_filemode(SNUM(conn)) &&
2604             can_write_to_file(conn, smb_fname)) {
2605                 return true;
2606         }
2607
2608         return false;
2609 }
2610
2611 /****************************************************************************
2612  Attempt to apply an ACL to a file or directory.
2613 ****************************************************************************/
2614
2615 static bool set_canon_ace_list(files_struct *fsp,
2616                                 canon_ace *the_ace,
2617                                 bool default_ace,
2618                                 const SMB_STRUCT_STAT *psbuf,
2619                                 bool *pacl_set_support)
2620 {
2621         connection_struct *conn = fsp->conn;
2622         bool ret = False;
2623         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2624         canon_ace *p_ace;
2625         int i;
2626         SMB_ACL_ENTRY_T mask_entry;
2627         bool got_mask_entry = False;
2628         SMB_ACL_PERMSET_T mask_permset;
2629         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2630         bool needs_mask = False;
2631         mode_t mask_perms = 0;
2632
2633         /* Use the psbuf that was passed in. */
2634         if (psbuf != &fsp->fsp_name->st) {
2635                 fsp->fsp_name->st = *psbuf;
2636         }
2637
2638 #if defined(POSIX_ACL_NEEDS_MASK)
2639         /* HP-UX always wants to have a mask (called "class" there). */
2640         needs_mask = True;
2641 #endif
2642
2643         if (the_acl == NULL) {
2644
2645                 if (!no_acl_syscall_error(errno)) {
2646                         /*
2647                          * Only print this error message if we have some kind of ACL
2648                          * support that's not working. Otherwise we would always get this.
2649                          */
2650                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2651                                 default_ace ? "default" : "file", strerror(errno) ));
2652                 }
2653                 *pacl_set_support = False;
2654                 goto fail;
2655         }
2656
2657         if( DEBUGLVL( 10 )) {
2658                 dbgtext("set_canon_ace_list: setting ACL:\n");
2659                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2660                         print_canon_ace( p_ace, i);
2661                 }
2662         }
2663
2664         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2665                 SMB_ACL_ENTRY_T the_entry;
2666                 SMB_ACL_PERMSET_T the_permset;
2667
2668                 /*
2669                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2670                  * named group entries. But if there is an ACL_MASK entry, it applies
2671                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2672                  * so that it doesn't deny (i.e., mask off) any permissions.
2673                  */
2674
2675                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2676                         needs_mask = True;
2677                         mask_perms |= p_ace->perms;
2678                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2679                         mask_perms |= p_ace->perms;
2680                 }
2681
2682                 /*
2683                  * Get the entry for this ACE.
2684                  */
2685
2686                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2687                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2688                                 i, strerror(errno) ));
2689                         goto fail;
2690                 }
2691
2692                 if (p_ace->type == SMB_ACL_MASK) {
2693                         mask_entry = the_entry;
2694                         got_mask_entry = True;
2695                 }
2696
2697                 /*
2698                  * Ok - we now know the ACL calls should be working, don't
2699                  * allow fallback to chmod.
2700                  */
2701
2702                 *pacl_set_support = True;
2703
2704                 /*
2705                  * Initialise the entry from the canon_ace.
2706                  */
2707
2708                 /*
2709                  * First tell the entry what type of ACE this is.
2710                  */
2711
2712                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2713                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2714                                 i, strerror(errno) ));
2715                         goto fail;
2716                 }
2717
2718                 /*
2719                  * Only set the qualifier (user or group id) if the entry is a user
2720                  * or group id ACE.
2721                  */
2722
2723                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2724                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2725                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2726                                         i, strerror(errno) ));
2727                                 goto fail;
2728                         }
2729                 }
2730
2731                 /*
2732                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2733                  */
2734
2735                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2736                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2737                                 i, strerror(errno) ));
2738                         goto fail;
2739                 }
2740
2741                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2742                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2743                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2744                         goto fail;
2745                 }
2746
2747                 /*
2748                  * ..and apply them to the entry.
2749                  */
2750
2751                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2752                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2753                                 i, strerror(errno) ));
2754                         goto fail;
2755                 }
2756
2757                 if( DEBUGLVL( 10 ))
2758                         print_canon_ace( p_ace, i);
2759
2760         }
2761
2762         if (needs_mask && !got_mask_entry) {
2763                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2764                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2765                         goto fail;
2766                 }
2767
2768                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2769                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2770                         goto fail;
2771                 }
2772
2773                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2774                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2775                         goto fail;
2776                 }
2777
2778                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2779                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2780                         goto fail;
2781                 }
2782
2783                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2784                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2785                         goto fail;
2786                 }
2787         }
2788
2789         /*
2790          * Finally apply it to the file or directory.
2791          */
2792
2793         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2794                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2795                                              the_acl_type, the_acl) == -1) {
2796                         /*
2797                          * Some systems allow all the above calls and only fail with no ACL support
2798                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2799                          */
2800                         if (no_acl_syscall_error(errno)) {
2801                                 *pacl_set_support = False;
2802                         }
2803
2804                         if (acl_group_override(conn, fsp->fsp_name)) {
2805                                 int sret;
2806
2807                                 DEBUG(5,("set_canon_ace_list: acl group "
2808                                          "control on and current user in file "
2809                                          "%s primary group.\n",
2810                                          fsp_str_dbg(fsp)));
2811
2812                                 become_root();
2813                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2814                                     fsp->fsp_name->base_name, the_acl_type,
2815                                     the_acl);
2816                                 unbecome_root();
2817                                 if (sret == 0) {
2818                                         ret = True;
2819                                 }
2820                         }
2821
2822                         if (ret == False) {
2823                                 DEBUG(2,("set_canon_ace_list: "
2824                                          "sys_acl_set_file type %s failed for "
2825                                          "file %s (%s).\n",
2826                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2827                                          "directory default" : "file",
2828                                          fsp_str_dbg(fsp), strerror(errno)));
2829                                 goto fail;
2830                         }
2831                 }
2832         } else {
2833                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2834                         /*
2835                          * Some systems allow all the above calls and only fail with no ACL support
2836                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2837                          */
2838                         if (no_acl_syscall_error(errno)) {
2839                                 *pacl_set_support = False;
2840                         }
2841
2842                         if (acl_group_override(conn, fsp->fsp_name)) {
2843                                 int sret;
2844
2845                                 DEBUG(5,("set_canon_ace_list: acl group "
2846                                          "control on and current user in file "
2847                                          "%s primary group.\n",
2848                                          fsp_str_dbg(fsp)));
2849
2850                                 become_root();
2851                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2852                                 unbecome_root();
2853                                 if (sret == 0) {
2854                                         ret = True;
2855                                 }
2856                         }
2857
2858                         if (ret == False) {
2859                                 DEBUG(2,("set_canon_ace_list: "
2860                                          "sys_acl_set_file failed for file %s "
2861                                          "(%s).\n",
2862                                          fsp_str_dbg(fsp), strerror(errno)));
2863                                 goto fail;
2864                         }
2865                 }
2866         }
2867
2868         ret = True;
2869
2870   fail:
2871
2872         if (the_acl != NULL) {
2873                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2874         }
2875
2876         return ret;
2877 }
2878
2879 /****************************************************************************
2880  Find a particular canon_ace entry.
2881 ****************************************************************************/
2882
2883 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2884 {
2885         while (list) {
2886                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2887                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2888                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2889                         break;
2890                 list = list->next;
2891         }
2892         return list;
2893 }
2894
2895 /****************************************************************************
2896
2897 ****************************************************************************/
2898
2899 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2900 {
2901         SMB_ACL_ENTRY_T entry;
2902
2903         if (!the_acl)
2904                 return NULL;
2905         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2906                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2907                 return NULL;
2908         }
2909         return the_acl;
2910 }
2911
2912 /****************************************************************************
2913  Convert a canon_ace to a generic 3 element permission - if possible.
2914 ****************************************************************************/
2915
2916 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2917
2918 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2919 {
2920         int snum = SNUM(fsp->conn);
2921         size_t ace_count = count_canon_ace_list(file_ace_list);
2922         canon_ace *ace_p;
2923         canon_ace *owner_ace = NULL;
2924         canon_ace *group_ace = NULL;
2925         canon_ace *other_ace = NULL;
2926         mode_t and_bits;
2927         mode_t or_bits;
2928
2929         if (ace_count != 3) {
2930                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2931                          "entries for file %s to convert to posix perms.\n",
2932                          fsp_str_dbg(fsp)));
2933                 return False;
2934         }
2935
2936         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2937                 if (ace_p->owner_type == UID_ACE)
2938                         owner_ace = ace_p;
2939                 else if (ace_p->owner_type == GID_ACE)
2940                         group_ace = ace_p;
2941                 else if (ace_p->owner_type == WORLD_ACE)
2942                         other_ace = ace_p;
2943         }
2944
2945         if (!owner_ace || !group_ace || !other_ace) {
2946                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
2947                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
2948                 return False;
2949         }
2950
2951         *posix_perms = (mode_t)0;
2952
2953         *posix_perms |= owner_ace->perms;
2954         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2955         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2956         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2957         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2958         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2959         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2960
2961         /* The owner must have at least read access. */
2962
2963         *posix_perms |= S_IRUSR;
2964         if (fsp->is_directory)
2965                 *posix_perms |= (S_IWUSR|S_IXUSR);
2966
2967         /* If requested apply the masks. */
2968
2969         /* Get the initial bits to apply. */
2970
2971         if (fsp->is_directory) {
2972                 and_bits = lp_dir_security_mask(snum);
2973                 or_bits = lp_force_dir_security_mode(snum);
2974         } else {
2975                 and_bits = lp_security_mask(snum);
2976                 or_bits = lp_force_security_mode(snum);
2977         }
2978
2979         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2980
2981         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
2982                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
2983                   (int)group_ace->perms, (int)other_ace->perms,
2984                   (int)*posix_perms, fsp_str_dbg(fsp)));
2985
2986         return True;
2987 }
2988
2989 /****************************************************************************
2990   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2991   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2992   with CI|OI set so it is inherited and also applies to the directory.
2993   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2994 ****************************************************************************/
2995
2996 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
2997 {
2998         size_t i, j;
2999
3000         for (i = 0; i < num_aces; i++) {
3001                 for (j = i+1; j < num_aces; j++) {
3002                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3003                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3004                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3005                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3006
3007                         /* We know the lower number ACE's are file entries. */
3008                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3009                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3010                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3011                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3012                                 (i_inh == j_inh) &&
3013                                 (i_flags_ni == 0) &&
3014                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3015                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3016                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3017                                 /*
3018                                  * W2K wants to have access allowed zero access ACE's
3019                                  * at the end of the list. If the mask is zero, merge
3020                                  * the non-inherited ACE onto the inherited ACE.
3021                                  */
3022
3023                                 if (nt_ace_list[i].access_mask == 0) {
3024                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3025                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3026                                         if (num_aces - i - 1 > 0)
3027                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3028                                                                 sizeof(struct security_ace));
3029
3030                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3031                                                 (unsigned int)i, (unsigned int)j ));
3032                                 } else {
3033                                         /*
3034                                          * These are identical except for the flags.
3035                                          * Merge the inherited ACE onto the non-inherited ACE.
3036                                          */
3037
3038                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3039                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3040                                         if (num_aces - j - 1 > 0)
3041                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3042                                                                 sizeof(struct security_ace));
3043
3044                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3045                                                 (unsigned int)j, (unsigned int)i ));
3046                                 }
3047                                 num_aces--;
3048                                 break;
3049                         }
3050                 }
3051         }
3052
3053         return num_aces;
3054 }
3055
3056 /*
3057  * Add or Replace ACE entry.
3058  * In some cases we need to add a specific ACE for compatibility reasons.
3059  * When doing that we must make sure we are not actually creating a duplicate
3060  * entry. So we need to search whether an ACE entry already exist and eventually
3061  * replacce the access mask, or add a completely new entry if none was found.
3062  *
3063  * This function assumes the array has enough space to add a new entry without
3064  * any reallocation of memory.
3065  */
3066
3067 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3068                                 const struct dom_sid *sid, enum security_ace_type type,
3069                                 uint32_t mask, uint8_t flags)
3070 {
3071         int i;
3072
3073         /* first search for a duplicate */
3074         for (i = 0; i < *num_aces; i++) {
3075                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3076                     (nt_ace_list[i].flags == flags)) break;
3077         }
3078
3079         if (i < *num_aces) { /* found */
3080                 nt_ace_list[i].type = type;
3081                 nt_ace_list[i].access_mask = mask;
3082                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3083                            i, sid_string_dbg(sid), flags));
3084                 return;
3085         }
3086
3087         /* not found, append it */
3088         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3089 }
3090
3091
3092 /****************************************************************************
3093  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3094  the space for the return elements and returns the size needed to return the
3095  security descriptor. This should be the only external function needed for
3096  the UNIX style get ACL.
3097 ****************************************************************************/
3098
3099 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3100                                       const char *name,
3101                                       const SMB_STRUCT_STAT *sbuf,
3102                                       struct pai_val *pal,
3103                                       SMB_ACL_T posix_acl,
3104                                       SMB_ACL_T def_acl,
3105                                       uint32_t security_info,
3106                                       struct security_descriptor **ppdesc)
3107 {
3108         struct dom_sid owner_sid;
3109         struct dom_sid group_sid;
3110         size_t sd_size = 0;
3111         struct security_acl *psa = NULL;
3112         size_t num_acls = 0;
3113         size_t num_def_acls = 0;
3114         size_t num_aces = 0;
3115         canon_ace *file_ace = NULL;
3116         canon_ace *dir_ace = NULL;
3117         struct security_ace *nt_ace_list = NULL;
3118         size_t num_profile_acls = 0;
3119         struct dom_sid orig_owner_sid;
3120         struct security_descriptor *psd = NULL;
3121         int i;
3122
3123         /*
3124          * Get the owner, group and world SIDs.
3125          */
3126
3127         create_file_sids(sbuf, &owner_sid, &group_sid);
3128
3129         if (lp_profile_acls(SNUM(conn))) {
3130                 /* For WXP SP1 the owner must be administrators. */
3131                 sid_copy(&orig_owner_sid, &owner_sid);
3132                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3133                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3134                 num_profile_acls = 3;
3135         }
3136
3137         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3138
3139                 /*
3140                  * In the optimum case Creator Owner and Creator Group would be used for
3141                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3142                  * would lead to usability problems under Windows: The Creator entries
3143                  * are only available in browse lists of directories and not for files;
3144                  * additionally the identity of the owning group couldn't be determined.
3145                  * We therefore use those identities only for Default ACLs.
3146                  */
3147
3148                 /* Create the canon_ace lists. */
3149                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3150                                             &owner_sid, &group_sid, pal,
3151                                             SMB_ACL_TYPE_ACCESS);
3152
3153                 /* We must have *some* ACLS. */
3154
3155                 if (count_canon_ace_list(file_ace) == 0) {
3156                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3157                         goto done;
3158                 }
3159
3160                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3161                         dir_ace = canonicalise_acl(conn, name, def_acl,
3162                                                    sbuf,
3163                                                    &global_sid_Creator_Owner,
3164                                                    &global_sid_Creator_Group,
3165                                                    pal, SMB_ACL_TYPE_DEFAULT);
3166                 }
3167
3168                 /*
3169                  * Create the NT ACE list from the canonical ace lists.
3170                  */
3171
3172                 {
3173                         canon_ace *ace;
3174                         enum security_ace_type nt_acl_type;
3175
3176                         if (nt4_compatible_acls() && dir_ace) {
3177                                 /*
3178                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3179                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3180                                  * remove entries from the Access ACL if the
3181                                  * corresponding Default ACL entries have also been
3182                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3183                                  * are exceptions. We can do nothing
3184                                  * intelligent if the Default ACL contains entries that
3185                                  * are not also contained in the Access ACL, so this
3186                                  * case will still fail under NT 4.
3187                                  */
3188
3189                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3190                                 if (ace && !ace->perms) {
3191                                         DLIST_REMOVE(dir_ace, ace);
3192                                         TALLOC_FREE(ace);
3193
3194                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3195                                         if (ace && !ace->perms) {
3196                                                 DLIST_REMOVE(file_ace, ace);
3197                                                 TALLOC_FREE(ace);
3198                                         }
3199                                 }
3200
3201                                 /*
3202                                  * WinNT doesn't usually have Creator Group
3203                                  * in browse lists, so we send this entry to
3204                                  * WinNT even if it contains no relevant
3205                                  * permissions. Once we can add
3206                                  * Creator Group to browse lists we can
3207                                  * re-enable this.
3208                                  */
3209
3210 #if 0
3211                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3212                                 if (ace && !ace->perms) {
3213                                         DLIST_REMOVE(dir_ace, ace);
3214                                         TALLOC_FREE(ace);
3215                                 }
3216 #endif
3217
3218                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3219                                 if (ace && !ace->perms) {
3220                                         DLIST_REMOVE(file_ace, ace);
3221                                         TALLOC_FREE(ace);
3222                                 }
3223                         }
3224
3225                         num_acls = count_canon_ace_list(file_ace);
3226                         num_def_acls = count_canon_ace_list(dir_ace);
3227
3228                         /* Allocate the ace list. */
3229                         if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3230                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3231                                 goto done;
3232                         }
3233
3234                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3235
3236                         /*
3237                          * Create the NT ACE list from the canonical ace lists.
3238                          */
3239
3240                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3241                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3242                                                 &nt_acl_type,
3243                                                 ace->perms,
3244                                                 S_ISDIR(sbuf->st_ex_mode));
3245                                 init_sec_ace(&nt_ace_list[num_aces++],
3246                                         &ace->trustee,
3247                                         nt_acl_type,
3248                                         acc,
3249                                         ace->ace_flags);
3250                         }
3251
3252                         /* The User must have access to a profile share - even
3253                          * if we can't map the SID. */
3254                         if (lp_profile_acls(SNUM(conn))) {
3255                                 add_or_replace_ace(nt_ace_list, &num_aces,
3256                                                    &global_sid_Builtin_Users,
3257                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3258                                                    FILE_GENERIC_ALL, 0);
3259                         }
3260
3261                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3262                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3263                                                 &nt_acl_type,
3264                                                 ace->perms,
3265                                                 S_ISDIR(sbuf->st_ex_mode));
3266                                 init_sec_ace(&nt_ace_list[num_aces++],
3267                                         &ace->trustee,
3268                                         nt_acl_type,
3269                                         acc,
3270                                         ace->ace_flags |
3271                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3272                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3273                                         SEC_ACE_FLAG_INHERIT_ONLY);
3274                         }
3275
3276                         /* The User must have access to a profile share - even
3277                          * if we can't map the SID. */
3278                         if (lp_profile_acls(SNUM(conn))) {
3279                                 add_or_replace_ace(nt_ace_list, &num_aces,
3280                                                 &global_sid_Builtin_Users,
3281                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3282                                                 FILE_GENERIC_ALL,
3283                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3284                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3285                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3286                         }
3287
3288                         /*
3289                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3290                          * Win2K needs this to get the inheritance correct when replacing ACLs
3291                          * on a directory tree. Based on work by Jim @ IBM.
3292                          */
3293
3294                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3295
3296                         if (lp_profile_acls(SNUM(conn))) {
3297                                 for (i = 0; i < num_aces; i++) {
3298                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3299                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3300                                                                    &orig_owner_sid,
3301                                                                    nt_ace_list[i].type,
3302                                                                    nt_ace_list[i].access_mask,
3303                                                                    nt_ace_list[i].flags);
3304                                                 break;
3305                                         }
3306                                 }
3307                         }
3308                 }
3309
3310                 if (num_aces) {
3311                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3312                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3313                                 goto done;
3314                         }
3315                 }
3316         } /* security_info & SECINFO_DACL */
3317
3318         psd = make_standard_sec_desc( talloc_tos(),
3319                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3320                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3321                         psa,
3322                         &sd_size);
3323
3324         if(!psd) {
3325                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3326                 sd_size = 0;
3327                 goto done;
3328         }
3329
3330         /*
3331          * Windows 2000: The DACL_PROTECTED flag in the security
3332          * descriptor marks the ACL as non-inheriting, i.e., no
3333          * ACEs from higher level directories propagate to this
3334          * ACL. In the POSIX ACL model permissions are only
3335          * inherited at file create time, so ACLs never contain
3336          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3337          * flag doesn't seem to bother Windows NT.
3338          * Always set this if map acl inherit is turned off.
3339          */
3340         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3341                 psd->type |= SEC_DESC_DACL_PROTECTED;
3342         } else {
3343                 psd->type |= pal->sd_type;
3344         }
3345
3346         if (psd->dacl) {
3347                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3348         }
3349
3350         *ppdesc = psd;
3351
3352  done:
3353
3354         if (posix_acl) {
3355                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3356         }
3357         if (def_acl) {
3358                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3359         }
3360         free_canon_ace_list(file_ace);
3361         free_canon_ace_list(dir_ace);
3362         free_inherited_info(pal);
3363         TALLOC_FREE(nt_ace_list);
3364
3365         return NT_STATUS_OK;
3366 }
3367
3368 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3369                            struct security_descriptor **ppdesc)
3370 {
3371         SMB_STRUCT_STAT sbuf;
3372         SMB_ACL_T posix_acl = NULL;
3373         struct pai_val *pal;
3374
3375         *ppdesc = NULL;
3376
3377         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3378                   fsp_str_dbg(fsp)));
3379
3380         /* can it happen that fsp_name == NULL ? */
3381         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3382                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3383                                         security_info, ppdesc);
3384         }
3385
3386         /* Get the stat struct for the owner info. */
3387         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3388                 return map_nt_error_from_unix(errno);
3389         }
3390
3391         /* Get the ACL from the fd. */
3392         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3393
3394         pal = fload_inherited_info(fsp);
3395
3396         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3397                                        &sbuf, pal, posix_acl, NULL,
3398                                        security_info, ppdesc);
3399 }
3400
3401 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3402                           uint32_t security_info, struct security_descriptor **ppdesc)
3403 {
3404         SMB_ACL_T posix_acl = NULL;
3405         SMB_ACL_T def_acl = NULL;
3406         struct pai_val *pal;
3407         struct smb_filename smb_fname;
3408         int ret;
3409
3410         *ppdesc = NULL;
3411
3412         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3413
3414         ZERO_STRUCT(smb_fname);
3415         smb_fname.base_name = discard_const_p(char, name);
3416
3417         /* Get the stat struct for the owner info. */
3418         if (lp_posix_pathnames()) {
3419                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3420         } else {
3421                 ret = SMB_VFS_STAT(conn, &smb_fname);
3422         }
3423
3424         if (ret == -1) {
3425                 return map_nt_error_from_unix(errno);
3426         }
3427
3428         /* Get the ACL from the path. */
3429         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3430
3431         /* If it's a directory get the default POSIX ACL. */
3432         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3433                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3434                 def_acl = free_empty_sys_acl(conn, def_acl);
3435         }
3436
3437         pal = load_inherited_info(conn, name);
3438
3439         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3440                                        posix_acl, def_acl, security_info,
3441                                        ppdesc);
3442 }
3443
3444 /****************************************************************************
3445  Try to chown a file. We will be able to chown it under the following conditions.
3446
3447   1) If we have root privileges, then it will just work.
3448   2) If we have SeRestorePrivilege we can change the user + group to any other user.
3449   3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3450   4) If we have write permission to the file and dos_filemodes is set
3451      then allow chown to the currently authenticated user.
3452 ****************************************************************************/
3453
3454 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3455 {
3456         NTSTATUS status;
3457
3458         if(!CAN_WRITE(fsp->conn)) {
3459                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3460         }
3461
3462         /* Case (1). */
3463         status = vfs_chown_fsp(fsp, uid, gid);
3464         if (NT_STATUS_IS_OK(status)) {
3465                 return status;
3466         }
3467
3468         /* Case (2) / (3) */
3469         if (lp_enable_privileges()) {
3470                 bool has_take_ownership_priv = security_token_has_privilege(
3471                                                 get_current_nttok(fsp->conn),
3472                                                 SEC_PRIV_TAKE_OWNERSHIP);
3473                 bool has_restore_priv = security_token_has_privilege(
3474                                                 get_current_nttok(fsp->conn),
3475                                                 SEC_PRIV_RESTORE);
3476
3477                 if (has_restore_priv) {
3478                         ; /* Case (2) */
3479                 } else if (has_take_ownership_priv) {
3480                         /* Case (3) */
3481                         if (uid == get_current_uid(fsp->conn)) {
3482                                 gid = (gid_t)-1;
3483                         } else {
3484                                 has_take_ownership_priv = false;
3485                         }
3486                 }
3487
3488                 if (has_take_ownership_priv || has_restore_priv) {
3489                         become_root();
3490                         status = vfs_chown_fsp(fsp, uid, gid);
3491                         unbecome_root();
3492                         return status;
3493                 }
3494         }
3495
3496         /* Case (4). */
3497         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3498                 return NT_STATUS_ACCESS_DENIED;
3499         }
3500
3501         /* only allow chown to the current user. This is more secure,
3502            and also copes with the case where the SID in a take ownership ACL is
3503            a local SID on the users workstation
3504         */
3505         if (uid != get_current_uid(fsp->conn)) {
3506                 return NT_STATUS_ACCESS_DENIED;
3507         }
3508
3509         become_root();
3510         /* Keep the current file gid the same. */
3511         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3512         unbecome_root();
3513
3514         return status;
3515 }
3516
3517 #if 0
3518 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3519
3520 /****************************************************************************
3521  Take care of parent ACL inheritance.
3522 ****************************************************************************/
3523
3524 NTSTATUS append_parent_acl(files_struct *fsp,
3525                                 const struct security_descriptor *pcsd,
3526                                 struct security_descriptor **pp_new_sd)
3527 {
3528         struct smb_filename *smb_dname = NULL;
3529         struct security_descriptor *parent_sd = NULL;
3530         files_struct *parent_fsp = NULL;
3531         TALLOC_CTX *mem_ctx = talloc_tos();
3532         char *parent_name = NULL;
3533         struct security_ace *new_ace = NULL;
3534         unsigned int num_aces = pcsd->dacl->num_aces;
3535         NTSTATUS status;
3536         int info;
3537         unsigned int i, j;
3538         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3539         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3540
3541         if (psd == NULL) {
3542                 return NT_STATUS_NO_MEMORY;
3543         }
3544
3545         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3546                             NULL)) {
3547                 return NT_STATUS_NO_MEMORY;
3548         }
3549
3550         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3551                                             &smb_dname);
3552         if (!NT_STATUS_IS_OK(status)) {
3553                 goto fail;
3554         }
3555
3556         status = SMB_VFS_CREATE_FILE(
3557                 fsp->conn,                              /* conn */
3558                 NULL,                                   /* req */
3559                 0,                                      /* root_dir_fid */
3560                 smb_dname,                              /* fname */
3561                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3562                 FILE_SHARE_NONE,                        /* share_access */
3563                 FILE_OPEN,                              /* create_disposition*/
3564                 FILE_DIRECTORY_FILE,                    /* create_options */
3565                 0,                                      /* file_attributes */
3566                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3567                 0,                                      /* allocation_size */
3568                 NULL,                                   /* sd */
3569                 NULL,                                   /* ea_list */
3570                 &parent_fsp,                            /* result */
3571                 &info);                                 /* pinfo */
3572
3573         if (!NT_STATUS_IS_OK(status)) {
3574                 TALLOC_FREE(smb_dname);
3575                 return status;
3576         }
3577
3578         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3579                                     SECINFO_DACL, &parent_sd );
3580
3581         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3582         TALLOC_FREE(smb_dname);
3583
3584         if (!NT_STATUS_IS_OK(status)) {
3585                 return status;
3586         }
3587
3588         /*
3589          * Make room for potentially all the ACLs from
3590          * the parent. We used to add the ugw triple here,
3591          * as we knew we were dealing with POSIX ACLs.
3592          * We no longer need to do so as we can guarentee
3593          * that a default ACL from the parent directory will
3594          * be well formed for POSIX ACLs if it came from a
3595          * POSIX ACL source, and if we're not writing to a
3596          * POSIX ACL sink then we don't care if it's not well
3597          * formed. JRA.
3598          */
3599
3600         num_aces += parent_sd->dacl->num_aces;
3601
3602         if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3603                                         num_aces)) == NULL) {
3604                 return NT_STATUS_NO_MEMORY;
3605         }
3606
3607         /* Start by copying in all the given ACE entries. */
3608         for (i = 0; i < psd->dacl->num_aces; i++) {
3609                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3610         }
3611
3612         /*
3613          * Note that we're ignoring "inherit permissions" here
3614          * as that really only applies to newly created files. JRA.
3615          */
3616
3617         /* Finally append any inherited ACEs. */
3618         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3619                 struct security_ace *se = &parent_sd->dacl->aces[j];
3620
3621                 if (fsp->is_directory) {
3622                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3623                                 /* Doesn't apply to a directory - ignore. */
3624                                 DEBUG(10,("append_parent_acl: directory %s "
3625                                         "ignoring non container "
3626                                         "inherit flags %u on ACE with sid %s "
3627                                         "from parent %s\n",
3628                                         fsp_str_dbg(fsp),
3629                                         (unsigned int)se->flags,
3630                                         sid_string_dbg(&se->trustee),
3631                                         parent_name));
3632                                 continue;
3633                         }
3634                 } else {
3635                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3636                                 /* Doesn't apply to a file - ignore. */
3637                                 DEBUG(10,("append_parent_acl: file %s "
3638                                         "ignoring non object "
3639                                         "inherit flags %u on ACE with sid %s "
3640                                         "from parent %s\n",
3641                                         fsp_str_dbg(fsp),
3642                                         (unsigned int)se->flags,
3643                                         sid_string_dbg(&se->trustee),
3644                                         parent_name));
3645                                 continue;
3646                         }
3647                 }
3648
3649                 if (is_dacl_protected) {
3650                         /* If the DACL is protected it means we must
3651                          * not overwrite an existing ACE entry with the
3652                          * same SID. This is order N^2. Ouch :-(. JRA. */
3653                         unsigned int k;
3654                         for (k = 0; k < psd->dacl->num_aces; k++) {
3655                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3656                                                 &se->trustee)) {
3657                                         break;
3658                                 }
3659                         }
3660                         if (k < psd->dacl->num_aces) {
3661                                 /* SID matched. Ignore. */
3662                                 DEBUG(10,("append_parent_acl: path %s "
3663                                         "ignoring ACE with protected sid %s "
3664                                         "from parent %s\n",
3665                                         fsp_str_dbg(fsp),
3666                                         sid_string_dbg(&se->trustee),
3667                                         parent_name));
3668                                 continue;
3669                         }
3670                 }
3671
3672                 sec_ace_copy(&new_ace[i], se);
3673                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3674                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3675                 }
3676                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3677
3678                 if (fsp->is_directory) {
3679                         /*
3680                          * Strip off any inherit only. It's applied.
3681                          */
3682                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3683                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3684                                 /* No further inheritance. */
3685                                 new_ace[i].flags &=
3686                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3687                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3688                         }
3689                 } else {
3690                         /*
3691                          * Strip off any container or inherit
3692                          * flags, they can't apply to objects.
3693                          */
3694                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3695                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3696                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3697                 }
3698                 i++;
3699
3700                 DEBUG(10,("append_parent_acl: path %s "
3701                         "inheriting ACE with sid %s "
3702                         "from parent %s\n",
3703                         fsp_str_dbg(fsp),
3704                         sid_string_dbg(&se->trustee),
3705                         parent_name));
3706         }
3707
3708         psd->dacl->aces = new_ace;
3709         psd->dacl->num_aces = i;
3710         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3711                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
3712
3713         *pp_new_sd = psd;
3714         return status;
3715 }
3716 #endif
3717
3718 /****************************************************************************
3719  Reply to set a security descriptor on an fsp. security_info_sent is the
3720  description of the following NT ACL.
3721  This should be the only external function needed for the UNIX style set ACL.
3722  We make a copy of psd_orig as internal functions modify the elements inside
3723  it, even though it's a const pointer.
3724 ****************************************************************************/
3725
3726 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3727 {
3728         connection_struct *conn = fsp->conn;
3729         uid_t user = (uid_t)-1;
3730         gid_t grp = (gid_t)-1;
3731         struct dom_sid file_owner_sid;
3732         struct dom_sid file_grp_sid;
3733         canon_ace *file_ace_list = NULL;
3734         canon_ace *dir_ace_list = NULL;
3735         bool acl_perms = False;
3736         mode_t orig_mode = (mode_t)0;
3737         NTSTATUS status;
3738         bool set_acl_as_root = false;
3739         bool acl_set_support = false;
3740         bool ret = false;
3741         struct security_descriptor *psd = NULL;
3742
3743         DEBUG(10,("set_nt_acl: called for file %s\n",
3744                   fsp_str_dbg(fsp)));
3745
3746         if (!CAN_WRITE(conn)) {
3747                 DEBUG(10,("set acl rejected on read-only share\n"));
3748                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3749         }
3750
3751         if (!psd_orig) {
3752                 return NT_STATUS_INVALID_PARAMETER;
3753         }
3754
3755         psd = dup_sec_desc(talloc_tos(), psd_orig);
3756         if (!psd) {
3757                 return NT_STATUS_NO_MEMORY;
3758         }
3759
3760         /*
3761          * Get the current state of the file.
3762          */
3763
3764         status = vfs_stat_fsp(fsp);
3765         if (!NT_STATUS_IS_OK(status)) {
3766                 return status;
3767         }
3768
3769         /* Save the original element we check against. */
3770         orig_mode = fsp->fsp_name->st.st_ex_mode;
3771
3772         /*
3773          * Unpack the user/group/world id's.
3774          */
3775
3776         /* POSIX can't cope with missing owner/group. */
3777         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3778                 security_info_sent &= ~SECINFO_OWNER;
3779         }
3780         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3781                 security_info_sent &= ~SECINFO_GROUP;
3782         }
3783
3784         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3785         if (!NT_STATUS_IS_OK(status)) {
3786                 return status;
3787         }
3788
3789         /*
3790          * Do we need to chown ? If so this must be done first as the incoming
3791          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3792          * Noticed by Simo.
3793          */
3794
3795         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3796             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3797
3798                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3799                          fsp_str_dbg(fsp), (unsigned int)user,
3800                          (unsigned int)grp));
3801
3802                 status = try_chown(fsp, user, grp);
3803                 if(!NT_STATUS_IS_OK(status)) {
3804                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3805                                 "= %s.\n", fsp_str_dbg(fsp),
3806                                 (unsigned int)user,
3807                                 (unsigned int)grp,
3808                                 nt_errstr(status)));
3809                         return status;
3810                 }
3811
3812                 /*
3813                  * Recheck the current state of the file, which may have changed.
3814                  * (suid/sgid bits, for instance)
3815                  */
3816
3817                 status = vfs_stat_fsp(fsp);
3818                 if (!NT_STATUS_IS_OK(status)) {
3819                         return status;
3820                 }
3821
3822                 /* Save the original element we check against. */
3823                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3824
3825                 /* If we successfully chowned, we know we must
3826                  * be able to set the acl, so do it as root.
3827                  */
3828                 set_acl_as_root = true;
3829         }
3830
3831         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3832
3833         if((security_info_sent & SECINFO_DACL) &&
3834                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3835                         (psd->dacl == NULL)) {
3836                 struct security_ace ace[3];
3837
3838                 /* We can't have NULL DACL in POSIX.
3839                    Use owner/group/Everyone -> full access. */
3840
3841                 init_sec_ace(&ace[0],
3842                                 &file_owner_sid,
3843                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3844                                 GENERIC_ALL_ACCESS,
3845                                 0);
3846                 init_sec_ace(&ace[1],
3847                                 &file_grp_sid,
3848                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3849                                 GENERIC_ALL_ACCESS,
3850                                 0);
3851                 init_sec_ace(&ace[2],
3852                                 &global_sid_World,
3853                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3854                                 GENERIC_ALL_ACCESS,
3855                                 0);
3856                 psd->dacl = make_sec_acl(talloc_tos(),
3857                                         NT4_ACL_REVISION,
3858                                         3,
3859                                         ace);
3860                 if (psd->dacl == NULL) {
3861                         return NT_STATUS_NO_MEMORY;
3862                 }
3863                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3864         }
3865
3866         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3867                                      &file_grp_sid, &file_ace_list,
3868                                      &dir_ace_list, security_info_sent, psd);
3869
3870         /* Ignore W2K traverse DACL set. */
3871         if (!file_ace_list && !dir_ace_list) {
3872                 return NT_STATUS_OK;
3873         }
3874
3875         if (!acl_perms) {
3876                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3877                 free_canon_ace_list(file_ace_list);
3878                 free_canon_ace_list(dir_ace_list);
3879                 return NT_STATUS_ACCESS_DENIED;
3880         }
3881
3882         /*
3883          * Only change security if we got a DACL.
3884          */
3885
3886         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3887                 free_canon_ace_list(file_ace_list);
3888                 free_canon_ace_list(dir_ace_list);
3889                 return NT_STATUS_OK;
3890         }
3891
3892         /*
3893          * Try using the POSIX ACL set first. Fall back to chmod if
3894          * we have no ACL support on this filesystem.
3895          */
3896
3897         if (acl_perms && file_ace_list) {
3898                 if (set_acl_as_root) {
3899                         become_root();
3900                 }
3901                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3902                                          &fsp->fsp_name->st, &acl_set_support);
3903                 if (set_acl_as_root) {
3904                         unbecome_root();
3905                 }
3906                 if (acl_set_support && ret == false) {
3907                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3908                                  "%s (%s).\n", fsp_str_dbg(fsp),
3909                                  strerror(errno)));
3910                         free_canon_ace_list(file_ace_list);
3911                         free_canon_ace_list(dir_ace_list);
3912                         return map_nt_error_from_unix(errno);
3913                 }
3914         }
3915
3916         if (acl_perms && acl_set_support && fsp->is_directory) {
3917                 if (dir_ace_list) {
3918                         if (set_acl_as_root) {
3919                                 become_root();
3920                         }
3921                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
3922                                                  &fsp->fsp_name->st,
3923                                                  &acl_set_support);
3924                         if (set_acl_as_root) {
3925                                 unbecome_root();
3926                         }
3927                         if (ret == false) {
3928                                 DEBUG(3,("set_nt_acl: failed to set default "
3929                                          "acl on directory %s (%s).\n",
3930                                          fsp_str_dbg(fsp), strerror(errno)));
3931                                 free_canon_ace_list(file_ace_list);
3932                                 free_canon_ace_list(dir_ace_list);
3933                                 return map_nt_error_from_unix(errno);
3934                         }
3935                 } else {
3936                         int sret = -1;
3937
3938                         /*
3939                          * No default ACL - delete one if it exists.
3940                          */
3941
3942                         if (set_acl_as_root) {
3943                                 become_root();
3944                         }
3945                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3946                             fsp->fsp_name->base_name);
3947                         if (set_acl_as_root) {
3948                                 unbecome_root();
3949                         }
3950                         if (sret == -1) {
3951                                 if (acl_group_override(conn, fsp->fsp_name)) {
3952                                         DEBUG(5,("set_nt_acl: acl group "
3953                                                  "control on and current user "
3954                                                  "in file %s primary group. "
3955                                                  "Override delete_def_acl\n",
3956                                                  fsp_str_dbg(fsp)));
3957
3958                                         become_root();
3959                                         sret =
3960                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3961                                                     conn,
3962                                                     fsp->fsp_name->base_name);
3963                                         unbecome_root();
3964                                 }
3965
3966                                 if (sret == -1) {
3967                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3968                                         free_canon_ace_list(file_ace_list);
3969                                         free_canon_ace_list(dir_ace_list);
3970                                         return map_nt_error_from_unix(errno);
3971                                 }
3972                         }
3973                 }
3974         }
3975
3976         if (acl_set_support) {
3977                 if (set_acl_as_root) {
3978                         become_root();
3979                 }
3980                 store_inheritance_attributes(fsp,
3981                                 file_ace_list,
3982                                 dir_ace_list,
3983                                 psd->type);
3984                 if (set_acl_as_root) {
3985                         unbecome_root();
3986                 }
3987         }
3988
3989         /*
3990          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3991          */
3992
3993         if(!acl_set_support && acl_perms) {
3994                 mode_t posix_perms;
3995
3996                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3997                         free_canon_ace_list(file_ace_list);
3998                         free_canon_ace_list(dir_ace_list);
3999                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4000                                  "posix permissions for file %s.\n",
4001                                  fsp_str_dbg(fsp)));
4002                         return NT_STATUS_ACCESS_DENIED;
4003                 }
4004
4005                 if (orig_mode != posix_perms) {
4006                         int sret = -1;
4007
4008                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4009                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4010
4011                         if (set_acl_as_root) {
4012                                 become_root();
4013                         }
4014                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4015                                              posix_perms);
4016                         if (set_acl_as_root) {
4017                                 unbecome_root();
4018                         }
4019                         if(sret == -1) {
4020                                 if (acl_group_override(conn, fsp->fsp_name)) {
4021                                         DEBUG(5,("set_nt_acl: acl group "
4022                                                  "control on and current user "
4023                                                  "in file %s primary group. "
4024                                                  "Override chmod\n",
4025                                                  fsp_str_dbg(fsp)));
4026
4027                                         become_root();
4028                                         sret = SMB_VFS_CHMOD(conn,
4029                                             fsp->fsp_name->base_name,
4030                                             posix_perms);
4031                                         unbecome_root();
4032                                 }
4033
4034                                 if (sret == -1) {
4035                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4036                                                  "failed. Error = %s.\n",
4037                                                  fsp_str_dbg(fsp),
4038                                                  (unsigned int)posix_perms,
4039                                                  strerror(errno)));
4040                                         free_canon_ace_list(file_ace_list);
4041                                         free_canon_ace_list(dir_ace_list);
4042                                         return map_nt_error_from_unix(errno);
4043                                 }
4044                         }
4045                 }
4046         }
4047
4048         free_canon_ace_list(file_ace_list);
4049         free_canon_ace_list(dir_ace_list);
4050
4051         /* Ensure the stat struct in the fsp is correct. */
4052         status = vfs_stat_fsp(fsp);
4053
4054         return NT_STATUS_OK;
4055 }
4056
4057 /****************************************************************************
4058  Get the actual group bits stored on a file with an ACL. Has no effect if
4059  the file has no ACL. Needed in dosmode code where the stat() will return
4060  the mask bits, not the real group bits, for a file with an ACL.
4061 ****************************************************************************/
4062
4063 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4064 {
4065         int entry_id = SMB_ACL_FIRST_ENTRY;
4066         SMB_ACL_ENTRY_T entry;
4067         SMB_ACL_T posix_acl;
4068         int result = -1;
4069
4070         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4071         if (posix_acl == (SMB_ACL_T)NULL)
4072                 return -1;
4073
4074         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4075                 SMB_ACL_TAG_T tagtype;
4076                 SMB_ACL_PERMSET_T permset;
4077
4078                 entry_id = SMB_ACL_NEXT_ENTRY;
4079
4080                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4081                         break;
4082
4083                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4084                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4085                                 break;
4086                         } else {
4087                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4088                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4089                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4090                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4091                                 result = 0;
4092                                 break;
4093                         }
4094                 }
4095         }
4096         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4097         return result;
4098 }
4099
4100 /****************************************************************************
4101  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4102  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4103 ****************************************************************************/
4104
4105 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4106 {
4107         int entry_id = SMB_ACL_FIRST_ENTRY;
4108         SMB_ACL_ENTRY_T entry;
4109         int num_entries = 0;
4110
4111         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4112                 SMB_ACL_TAG_T tagtype;
4113                 SMB_ACL_PERMSET_T permset;
4114                 mode_t perms;
4115
4116                 entry_id = SMB_ACL_NEXT_ENTRY;
4117
4118                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4119                         return -1;
4120
4121                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4122                         return -1;
4123
4124                 num_entries++;
4125
4126                 switch(tagtype) {
4127                         case SMB_ACL_USER_OBJ:
4128                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4129                                 break;
4130                         case SMB_ACL_GROUP_OBJ:
4131                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4132                                 break;
4133                         case SMB_ACL_MASK:
4134                                 /*
4135                                  * FIXME: The ACL_MASK entry permissions should really be set to
4136                                  * the union of the permissions of all ACL_USER,
4137                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4138                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4139                                  */
4140                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4141                                 break;
4142                         case SMB_ACL_OTHER:
4143                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4144                                 break;
4145                         default:
4146                                 continue;
4147                 }
4148
4149                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4150                         return -1;
4151
4152                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4153                         return -1;
4154         }
4155
4156         /*
4157          * If this is a simple 3 element ACL or no elements then it's a standard
4158          * UNIX permission set. Just use chmod...
4159          */
4160
4161         if ((num_entries == 3) || (num_entries == 0))
4162                 return -1;
4163
4164         return 0;
4165 }
4166
4167 /****************************************************************************
4168  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4169  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4170  resulting ACL on TO.  Note that name is in UNIX character set.
4171 ****************************************************************************/
4172
4173 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4174 {
4175         SMB_ACL_T posix_acl = NULL;
4176         int ret = -1;
4177
4178         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4179                 return -1;
4180
4181         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4182                 goto done;
4183
4184         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4185
4186  done:
4187
4188         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4189         return ret;
4190 }
4191
4192 /****************************************************************************
4193  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4194  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4195  Note that name is in UNIX character set.
4196 ****************************************************************************/
4197
4198 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4199 {
4200         return copy_access_posix_acl(conn, name, name, mode);
4201 }
4202
4203 /****************************************************************************
4204  Check for an existing default POSIX ACL on a directory.
4205 ****************************************************************************/
4206
4207 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4208 {
4209         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4210         bool has_acl = False;
4211         SMB_ACL_ENTRY_T entry;
4212
4213         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4214                 has_acl = True;
4215         }
4216
4217         if (def_acl) {
4218                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4219         }
4220         return has_acl;
4221 }
4222
4223 /****************************************************************************
4224  If the parent directory has no default ACL but it does have an Access ACL,
4225  inherit this Access ACL to file name.
4226 ****************************************************************************/
4227
4228 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4229                        const char *name, mode_t mode)
4230 {
4231         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4232                 return 0;
4233
4234         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4235 }
4236
4237 /****************************************************************************
4238  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4239  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4240 ****************************************************************************/
4241
4242 int fchmod_acl(files_struct *fsp, mode_t mode)
4243 {
4244         connection_struct *conn = fsp->conn;
4245         SMB_ACL_T posix_acl = NULL;
4246         int ret = -1;
4247
4248         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4249                 return -1;
4250
4251         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4252                 goto done;
4253
4254         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4255
4256   done:
4257
4258         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4259         return ret;
4260 }
4261
4262 /****************************************************************************
4263  Map from wire type to permset.
4264 ****************************************************************************/
4265
4266 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4267 {
4268         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4269                 return False;
4270         }
4271
4272         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4273                 return False;
4274         }
4275
4276         if (wire_perm & SMB_POSIX_ACL_READ) {
4277                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4278                         return False;
4279                 }
4280         }
4281         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4282                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4283                         return False;
4284                 }
4285         }
4286         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4287                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4288                         return False;
4289                 }
4290         }
4291         return True;
4292 }
4293
4294 /****************************************************************************
4295  Map from wire type to tagtype.
4296 ****************************************************************************/
4297
4298 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4299 {
4300         switch (wire_tt) {
4301                 case SMB_POSIX_ACL_USER_OBJ:
4302                         *p_tt = SMB_ACL_USER_OBJ;
4303                         break;
4304                 case SMB_POSIX_ACL_USER:
4305                         *p_tt = SMB_ACL_USER;
4306                         break;
4307                 case SMB_POSIX_ACL_GROUP_OBJ:
4308                         *p_tt = SMB_ACL_GROUP_OBJ;
4309                         break;
4310                 case SMB_POSIX_ACL_GROUP:
4311                         *p_tt = SMB_ACL_GROUP;
4312                         break;
4313                 case SMB_POSIX_ACL_MASK:
4314                         *p_tt = SMB_ACL_MASK;
4315                         break;
4316                 case SMB_POSIX_ACL_OTHER:
4317                         *p_tt = SMB_ACL_OTHER;
4318                         break;
4319                 default:
4320                         return False;
4321         }
4322         return True;
4323 }
4324
4325 /****************************************************************************
4326  Create a new POSIX acl from wire permissions.
4327  FIXME ! How does the share mask/mode fit into this.... ?
4328 ****************************************************************************/
4329
4330 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4331 {
4332         unsigned int i;
4333         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4334
4335         if (the_acl == NULL) {
4336                 return NULL;
4337         }
4338
4339         for (i = 0; i < num_acls; i++) {
4340                 SMB_ACL_ENTRY_T the_entry;
4341                 SMB_ACL_PERMSET_T the_permset;
4342                 SMB_ACL_TAG_T tag_type;
4343
4344                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4345                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4346                                 i, strerror(errno) ));
4347                         goto fail;
4348                 }
4349
4350                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4351                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4352                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4353                         goto fail;
4354                 }
4355
4356                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4357                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4358                                 i, strerror(errno) ));
4359                         goto fail;
4360                 }
4361
4362                 /* Get the permset pointer from the new ACL entry. */
4363                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4364                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4365                                 i, strerror(errno) ));
4366                         goto fail;
4367                 }
4368
4369                 /* Map from wire to permissions. */
4370                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4371                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4372                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4373                         goto fail;
4374                 }
4375
4376                 /* Now apply to the new ACL entry. */
4377                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4378                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4379                                 i, strerror(errno) ));
4380                         goto fail;
4381                 }
4382
4383                 if (tag_type == SMB_ACL_USER) {
4384                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4385                         uid_t uid = (uid_t)uidval;
4386                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4387                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4388                                         (unsigned int)uid, i, strerror(errno) ));
4389                                 goto fail;
4390                         }
4391                 }
4392
4393                 if (tag_type == SMB_ACL_GROUP) {
4394                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4395                         gid_t gid = (uid_t)gidval;
4396                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4397                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4398                                         (unsigned int)gid, i, strerror(errno) ));
4399                                 goto fail;
4400                         }
4401                 }
4402         }
4403
4404         return the_acl;
4405
4406  fail:
4407
4408         if (the_acl != NULL) {
4409                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4410         }
4411         return NULL;
4412 }
4413
4414 /****************************************************************************
4415  Calls from UNIX extensions - Default POSIX ACL set.
4416  If num_def_acls == 0 and not a directory just return. If it is a directory
4417  and num_def_acls == 0 then remove the default acl. Else set the default acl
4418  on the directory.
4419 ****************************************************************************/
4420
4421 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4422                                 uint16 num_def_acls, const char *pdata)
4423 {
4424         SMB_ACL_T def_acl = NULL;
4425
4426         if (!S_ISDIR(psbuf->st_ex_mode)) {
4427                 if (num_def_acls) {
4428                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4429                         errno = EISDIR;
4430                         return False;
4431                 } else {
4432                         return True;
4433                 }
4434         }
4435
4436         if (!num_def_acls) {
4437                 /* Remove the default ACL. */
4438                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4439                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4440                                 fname, strerror(errno) ));
4441                         return False;
4442                 }
4443                 return True;
4444         }
4445
4446         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4447                 return False;
4448         }
4449
4450         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4451                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4452                         fname, strerror(errno) ));
4453                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4454                 return False;
4455         }
4456
4457         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4458         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4459         return True;
4460 }
4461
4462 /****************************************************************************
4463  Remove an ACL from a file. As we don't have acl_delete_entry() available
4464  we must read the current acl and copy all entries except MASK, USER and GROUP
4465  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4466  removed.
4467  FIXME ! How does the share mask/mode fit into this.... ?
4468 ****************************************************************************/
4469
4470 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4471 {
4472         SMB_ACL_T file_acl = NULL;
4473         int entry_id = SMB_ACL_FIRST_ENTRY;
4474         SMB_ACL_ENTRY_T entry;
4475         bool ret = False;
4476         /* Create a new ACL with only 3 entries, u/g/w. */
4477         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4478         SMB_ACL_ENTRY_T user_ent = NULL;
4479         SMB_ACL_ENTRY_T group_ent = NULL;
4480         SMB_ACL_ENTRY_T other_ent = NULL;
4481
4482         if (new_file_acl == NULL) {
4483                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4484                 return False;
4485         }
4486
4487         /* Now create the u/g/w entries. */
4488         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4489                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4490                         fname, strerror(errno) ));
4491                 goto done;
4492         }
4493         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4494                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4495                         fname, strerror(errno) ));
4496                 goto done;
4497         }
4498
4499         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4500                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4501                         fname, strerror(errno) ));
4502                 goto done;
4503         }
4504         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4505                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4506                         fname, strerror(errno) ));
4507                 goto done;
4508         }
4509
4510         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4511                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4512                         fname, strerror(errno) ));
4513                 goto done;
4514         }
4515         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4516                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4517                         fname, strerror(errno) ));
4518                 goto done;
4519         }
4520
4521         /* Get the current file ACL. */
4522         if (fsp && fsp->fh->fd != -1) {
4523                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4524         } else {
4525                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4526         }
4527
4528         if (file_acl == NULL) {
4529                 /* This is only returned if an error occurred. Even for a file with
4530                    no acl a u/g/w acl should be returned. */
4531                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4532                         fname, strerror(errno) ));
4533                 goto done;
4534         }
4535
4536         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4537                 SMB_ACL_TAG_T tagtype;
4538                 SMB_ACL_PERMSET_T permset;
4539
4540                 entry_id = SMB_ACL_NEXT_ENTRY;
4541
4542                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4543                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4544                                 fname, strerror(errno) ));
4545                         goto done;
4546                 }
4547
4548                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4549                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4550                                 fname, strerror(errno) ));
4551                         goto done;
4552                 }
4553
4554                 if (tagtype == SMB_ACL_USER_OBJ) {
4555                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4556                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4557                                         fname, strerror(errno) ));
4558                         }
4559                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4560                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4561                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4562                                         fname, strerror(errno) ));
4563                         }
4564                 } else if (tagtype == SMB_ACL_OTHER) {
4565                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4566                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4567                                         fname, strerror(errno) ));
4568                         }
4569                 }
4570         }
4571
4572         /* Set the new empty file ACL. */
4573         if (fsp && fsp->fh->fd != -1) {
4574                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4575                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4576                                 fname, strerror(errno) ));
4577                         goto done;
4578                 }
4579         } else {
4580                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4581                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4582                                 fname, strerror(errno) ));
4583                         goto done;
4584                 }
4585         }
4586
4587         ret = True;
4588
4589  done:
4590
4591         if (file_acl) {
4592                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4593         }
4594         if (new_file_acl) {
4595                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4596         }
4597         return ret;
4598 }
4599
4600 /****************************************************************************
4601  Calls from UNIX extensions - POSIX ACL set.
4602  If num_def_acls == 0 then read/modify/write acl after removing all entries
4603  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4604 ****************************************************************************/
4605
4606 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4607 {
4608         SMB_ACL_T file_acl = NULL;
4609
4610         if (!num_acls) {
4611                 /* Remove the ACL from the file. */
4612                 return remove_posix_acl(conn, fsp, fname);
4613         }
4614
4615         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4616                 return False;
4617         }
4618
4619         if (fsp && fsp->fh->fd != -1) {
4620                 /* The preferred way - use an open fd. */
4621                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4622                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4623                                 fname, strerror(errno) ));
4624                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4625                         return False;
4626                 }
4627         } else {
4628                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4629                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4630                                 fname, strerror(errno) ));
4631                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4632                         return False;
4633                 }
4634         }
4635
4636         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4637         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4638         return True;
4639 }
4640
4641 /********************************************************************
4642  Pull the NT ACL from a file on disk or the OpenEventlog() access
4643  check.  Caller is responsible for freeing the returned security
4644  descriptor via TALLOC_FREE().  This is designed for dealing with
4645  user space access checks in smbd outside of the VFS.  For example,
4646  checking access rights in OpenEventlog().
4647
4648  Assume we are dealing with files (for now)
4649 ********************************************************************/
4650
4651 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4652 {
4653         struct security_descriptor *psd, *ret_sd;
4654         connection_struct *conn;
4655         files_struct finfo;
4656         struct fd_handle fh;
4657         NTSTATUS status;
4658
4659         conn = talloc_zero(ctx, connection_struct);
4660         if (conn == NULL) {
4661                 DEBUG(0, ("talloc failed\n"));
4662                 return NULL;
4663         }
4664
4665         if (!(conn->params = talloc(conn, struct share_params))) {
4666                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4667                 TALLOC_FREE(conn);
4668                 return NULL;
4669         }
4670
4671         conn->params->service = -1;
4672
4673         set_conn_connectpath(conn, "/");
4674
4675         if (!smbd_vfs_init(conn)) {
4676                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4677                 conn_free(conn);
4678                 return NULL;
4679         }
4680
4681         ZERO_STRUCT( finfo );
4682         ZERO_STRUCT( fh );
4683
4684         finfo.fnum = -1;
4685         finfo.conn = conn;
4686         finfo.fh = &fh;
4687         finfo.fh->fd = -1;
4688
4689         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4690                                             &finfo.fsp_name);
4691         if (!NT_STATUS_IS_OK(status)) {
4692                 conn_free(conn);
4693                 return NULL;
4694         }
4695
4696         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4697                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4698                 TALLOC_FREE(finfo.fsp_name);
4699                 conn_free(conn);
4700                 return NULL;
4701         }
4702
4703         ret_sd = dup_sec_desc( ctx, psd );
4704
4705         TALLOC_FREE(finfo.fsp_name);
4706         conn_free(conn);
4707
4708         return ret_sd;
4709 }
4710
4711 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4712
4713 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4714                                         const char *name,
4715                                         SMB_STRUCT_STAT *psbuf,
4716                                         struct security_descriptor **ppdesc)
4717 {
4718         struct dom_sid owner_sid, group_sid;
4719         size_t size = 0;
4720         struct security_ace aces[4];
4721         uint32_t access_mask = 0;
4722         mode_t mode = psbuf->st_ex_mode;
4723         struct security_acl *new_dacl = NULL;
4724         int idx = 0;
4725
4726         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4727                 name, (int)mode ));
4728
4729         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4730         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4731
4732         /*
4733          We provide up to 4 ACEs
4734                 - Owner
4735                 - Group
4736                 - Everyone
4737                 - NT System
4738         */
4739
4740         if (mode & S_IRUSR) {
4741                 if (mode & S_IWUSR) {
4742                         access_mask |= SEC_RIGHTS_FILE_ALL;
4743                 } else {
4744                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4745                 }
4746         }
4747         if (mode & S_IWUSR) {
4748                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4749         }
4750
4751         init_sec_ace(&aces[idx],
4752                         &owner_sid,
4753                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4754                         access_mask,
4755                         0);
4756         idx++;
4757
4758         access_mask = 0;
4759         if (mode & S_IRGRP) {
4760                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4761         }
4762         if (mode & S_IWGRP) {
4763                 /* note that delete is not granted - this matches posix behaviour */
4764                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4765         }
4766         if (access_mask) {
4767                 init_sec_ace(&aces[idx],
4768                         &group_sid,
4769                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4770                         access_mask,
4771                         0);
4772                 idx++;
4773         }
4774
4775         access_mask = 0;
4776         if (mode & S_IROTH) {
4777                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4778         }
4779         if (mode & S_IWOTH) {
4780                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4781         }
4782         if (access_mask) {
4783                 init_sec_ace(&aces[idx],
4784                         &global_sid_World,
4785                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4786                         access_mask,
4787                         0);
4788                 idx++;
4789         }
4790
4791         init_sec_ace(&aces[idx],
4792                         &global_sid_System,
4793                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4794                         SEC_RIGHTS_FILE_ALL,
4795                         0);
4796         idx++;
4797
4798         new_dacl = make_sec_acl(ctx,
4799                         NT4_ACL_REVISION,
4800                         idx,
4801                         aces);
4802
4803         if (!new_dacl) {
4804                 return NT_STATUS_NO_MEMORY;
4805         }
4806
4807         *ppdesc = make_sec_desc(ctx,
4808                         SECURITY_DESCRIPTOR_REVISION_1,
4809                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4810                         &owner_sid,
4811                         &group_sid,
4812                         NULL,
4813                         new_dacl,
4814                         &size);
4815         if (!*ppdesc) {
4816                 return NT_STATUS_NO_MEMORY;
4817         }
4818         return NT_STATUS_OK;
4819 }