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 = (char *)SMB_MALLOC(*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         SAFE_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                         SAFE_FREE(paie);
 308                 }
 309                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 310                         paie_next = paie->next;
 311                         SAFE_FREE(paie);
 312                 }
 313                 SAFE_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 = SMB_MALLOC_P(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                         SAFE_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 = SMB_MALLOC_P(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 = SMB_MALLOC_P(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                         SAFE_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 = SMB_MALLOC_P(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 = (char *)SMB_MALLOC(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                         SAFE_FREE(pai_buf);
 644                         if (pai_buf_size > 1024*1024) {
 645                                 return NULL; /* Limit malloc to 1mb. */
 646                         }
 647                         if ((pai_buf = (char *)SMB_MALLOC(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                 SAFE_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         SAFE_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 = (char *)SMB_MALLOC(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                         SAFE_FREE(pai_buf);
 711                         if (pai_buf_size > 1024*1024) {
 712                                 return NULL; /* Limit malloc to 1mb. */
 713                         }
 714                         if ((pai_buf = (char *)SMB_MALLOC(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                 SAFE_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         SAFE_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                 SAFE_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 = SMB_MALLOC_P(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                                 SAFE_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                                         SAFE_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                                         SAFE_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|FILE_READ_ATTRIBUTES)
1134 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
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 = SMB_MALLOC_P(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
1413                 if (setting_acl) {
1414                         /* See if the owning user is in any of the other groups in
1415                            the ACE. If so, OR in the permissions from that group. */
1416
1417                         bool group_matched = False;
1418                         canon_ace *pace_iter;
1419
1420                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1421                                 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1422                                         if (uid_entry_in_group(conn, pace, pace_iter)) {
1423                                                 pace->perms |= pace_iter->perms;
1424                                                 group_matched = True;
1425                                         }
1426                                 }
1427                         }
1428
1429                         /* If we only got an "everyone" perm, just use that. */
1430                         if (!group_matched) {
1431                                 if (got_other)
1432                                         pace->perms = pace_other->perms;
1433                                 else
1434                                         pace->perms = 0;
1435                         }
1436
1437                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1438                 } else {
1439                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1440                 }
1441
1442                 DLIST_ADD(*pp_ace, pace);
1443         }
1444
1445         if (!got_grp) {
1446                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1447                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1448                         return False;
1449                 }
1450
1451                 ZERO_STRUCTP(pace);
1452                 pace->type = SMB_ACL_GROUP_OBJ;
1453                 pace->owner_type = GID_ACE;
1454                 pace->unix_ug.uid = pst->st_ex_gid;
1455                 pace->trustee = *pfile_grp_sid;
1456                 pace->attr = ALLOW_ACE;
1457                 if (setting_acl) {
1458                         /* If we only got an "everyone" perm, just use that. */
1459                         if (got_other)
1460                                 pace->perms = pace_other->perms;
1461                         else
1462                                 pace->perms = 0;
1463                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1464                 } else {
1465                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1466                 }
1467
1468                 DLIST_ADD(*pp_ace, pace);
1469         }
1470
1471         if (!got_other) {
1472                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1473                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1474                         return False;
1475                 }
1476
1477                 ZERO_STRUCTP(pace);
1478                 pace->type = SMB_ACL_OTHER;
1479                 pace->owner_type = WORLD_ACE;
1480                 pace->unix_ug.world = -1;
1481                 pace->trustee = global_sid_World;
1482                 pace->attr = ALLOW_ACE;
1483                 if (setting_acl) {
1484                         pace->perms = 0;
1485                         apply_default_perms(params, is_directory, pace, S_IROTH);
1486                 } else
1487                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1488
1489                 DLIST_ADD(*pp_ace, pace);
1490         }
1491
1492         return True;
1493 }
1494
1495 /****************************************************************************
1496  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1497  If it does not have them, check if there are any entries where the trustee is the
1498  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1499  Note we must not do this to default directory ACLs.
1500 ****************************************************************************/
1501
1502 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1503 {
1504         bool got_user_obj, got_group_obj;
1505         canon_ace *current_ace;
1506         int i, entries;
1507
1508         entries = count_canon_ace_list(ace);
1509         got_user_obj = False;
1510         got_group_obj = False;
1511
1512         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1513                 if (current_ace->type == SMB_ACL_USER_OBJ)
1514                         got_user_obj = True;
1515                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1516                         got_group_obj = True;
1517         }
1518         if (got_user_obj && got_group_obj) {
1519                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1520                 return;
1521         }
1522
1523         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1524                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1525                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1526                         current_ace->type = SMB_ACL_USER_OBJ;
1527                         got_user_obj = True;
1528                 }
1529                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1530                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1531                         current_ace->type = SMB_ACL_GROUP_OBJ;
1532                         got_group_obj = True;
1533                 }
1534         }
1535         if (!got_user_obj)
1536                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1537         if (!got_group_obj)
1538                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1539 }
1540
1541 /****************************************************************************
1542  Unpack a struct security_descriptor into two canonical ace lists.
1543 ****************************************************************************/
1544
1545 static bool create_canon_ace_lists(files_struct *fsp,
1546                                         const SMB_STRUCT_STAT *pst,
1547                                         struct dom_sid *pfile_owner_sid,
1548                                         struct dom_sid *pfile_grp_sid,
1549                                         canon_ace **ppfile_ace,
1550                                         canon_ace **ppdir_ace,
1551                                         const struct security_acl *dacl)
1552 {
1553         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1554         canon_ace *file_ace = NULL;
1555         canon_ace *dir_ace = NULL;
1556         canon_ace *current_ace = NULL;
1557         bool got_dir_allow = False;
1558         bool got_file_allow = False;
1559         int i, j;
1560
1561         *ppfile_ace = NULL;
1562         *ppdir_ace = NULL;
1563
1564         /*
1565          * Convert the incoming ACL into a more regular form.
1566          */
1567
1568         for(i = 0; i < dacl->num_aces; i++) {
1569                 struct security_ace *psa = &dacl->aces[i];
1570
1571                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1572                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1573                         return False;
1574                 }
1575
1576                 if (nt4_compatible_acls()) {
1577                         /*
1578                          * The security mask may be UNIX_ACCESS_NONE which should map into
1579                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1580                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1581                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1582                          */
1583
1584                         /*
1585                          * Convert GENERIC bits to specific bits.
1586                          */
1587
1588                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1589
1590                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1591
1592                         if(psa->access_mask != UNIX_ACCESS_NONE)
1593                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1594                 }
1595         }
1596
1597         /*
1598          * Deal with the fact that NT 4.x re-writes the canonical format
1599          * that we return for default ACLs. If a directory ACE is identical
1600          * to a inherited directory ACE then NT changes the bits so that the
1601          * first ACE is set to OI|IO and the second ACE for this SID is set
1602          * to CI. We need to repair this. JRA.
1603          */
1604
1605         for(i = 0; i < dacl->num_aces; i++) {
1606                 struct security_ace *psa1 = &dacl->aces[i];
1607
1608                 for (j = i + 1; j < dacl->num_aces; j++) {
1609                         struct security_ace *psa2 = &dacl->aces[j];
1610
1611                         if (psa1->access_mask != psa2->access_mask)
1612                                 continue;
1613
1614                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1615                                 continue;
1616
1617                         /*
1618                          * Ok - permission bits and SIDs are equal.
1619                          * Check if flags were re-written.
1620                          */
1621
1622                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1623
1624                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1625                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1626
1627                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1628
1629                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1630                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1631
1632                         }
1633                 }
1634         }
1635
1636         for(i = 0; i < dacl->num_aces; i++) {
1637                 struct security_ace *psa = &dacl->aces[i];
1638
1639                 /*
1640                  * Create a canon_ace entry representing this NT DACL ACE.
1641                  */
1642
1643                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1644                         free_canon_ace_list(file_ace);
1645                         free_canon_ace_list(dir_ace);
1646                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1647                         return False;
1648                 }
1649
1650                 ZERO_STRUCTP(current_ace);
1651
1652                 sid_copy(&current_ace->trustee, &psa->trustee);
1653
1654                 /*
1655                  * Try and work out if the SID is a user or group
1656                  * as we need to flag these differently for POSIX.
1657                  * Note what kind of a POSIX ACL this should map to.
1658                  */
1659
1660                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1661                         current_ace->owner_type = WORLD_ACE;
1662                         current_ace->unix_ug.world = -1;
1663                         current_ace->type = SMB_ACL_OTHER;
1664                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1665                         current_ace->owner_type = UID_ACE;
1666                         current_ace->unix_ug.uid = pst->st_ex_uid;
1667                         current_ace->type = SMB_ACL_USER_OBJ;
1668
1669                         /*
1670                          * The Creator Owner entry only specifies inheritable permissions,
1671                          * never access permissions. WinNT doesn't always set the ACE to
1672                          * INHERIT_ONLY, though.
1673                          */
1674
1675                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1676
1677                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1678                         current_ace->owner_type = GID_ACE;
1679                         current_ace->unix_ug.gid = pst->st_ex_gid;
1680                         current_ace->type = SMB_ACL_GROUP_OBJ;
1681
1682                         /*
1683                          * The Creator Group entry only specifies inheritable permissions,
1684                          * never access permissions. WinNT doesn't always set the ACE to
1685                          * INHERIT_ONLY, though.
1686                          */
1687                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1688
1689                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1690                         current_ace->owner_type = UID_ACE;
1691                         /* If it's the owning user, this is a user_obj, not
1692                          * a user. */
1693                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1694                                 current_ace->type = SMB_ACL_USER_OBJ;
1695                         } else {
1696                                 current_ace->type = SMB_ACL_USER;
1697                         }
1698                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1699                         current_ace->owner_type = GID_ACE;
1700                         /* If it's the primary group, this is a group_obj, not
1701                          * a group. */
1702                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1703                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1704                         } else {
1705                                 current_ace->type = SMB_ACL_GROUP;
1706                         }
1707                 } else {
1708                         /*
1709                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1710                          */
1711
1712                         if (non_mappable_sid(&psa->trustee)) {
1713                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1714                                            "non-mappable SID %s\n",
1715                                            sid_string_dbg(&psa->trustee)));
1716                                 SAFE_FREE(current_ace);
1717                                 continue;
1718                         }
1719
1720                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1721                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1722                                         "unknown or foreign SID %s\n",
1723                                         sid_string_dbg(&psa->trustee)));
1724                                 SAFE_FREE(current_ace);
1725                                 continue;
1726                         }
1727
1728                         free_canon_ace_list(file_ace);
1729                         free_canon_ace_list(dir_ace);
1730                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1731                                   "%s to uid or gid.\n",
1732                                   sid_string_dbg(&current_ace->trustee)));
1733                         SAFE_FREE(current_ace);
1734                         return False;
1735                 }
1736
1737                 /*
1738                  * Map the given NT permissions into a UNIX mode_t containing only
1739                  * S_I(R|W|X)USR bits.
1740                  */
1741
1742                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1743                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1744
1745                 /* Store the ace_flag. */
1746                 current_ace->ace_flags = psa->flags;
1747
1748                 /*
1749                  * Now add the created ace to either the file list, the directory
1750                  * list, or both. We *MUST* preserve the order here (hence we use
1751                  * DLIST_ADD_END) as NT ACLs are order dependent.
1752                  */
1753
1754                 if (fsp->is_directory) {
1755
1756                         /*
1757                          * We can only add to the default POSIX ACE list if the ACE is
1758                          * designed to be inherited by both files and directories.
1759                          */
1760
1761                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1762                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1763
1764                                 canon_ace *current_dir_ace = current_ace;
1765                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1766
1767                                 /*
1768                                  * Note if this was an allow ace. We can't process
1769                                  * any further deny ace's after this.
1770                                  */
1771
1772                                 if (current_ace->attr == ALLOW_ACE)
1773                                         got_dir_allow = True;
1774
1775                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1776                                         DEBUG(0,("create_canon_ace_lists: "
1777                                                  "malformed ACL in "
1778                                                  "inheritable ACL! Deny entry "
1779                                                  "after Allow entry. Failing "
1780                                                  "to set on file %s.\n",
1781                                                  fsp_str_dbg(fsp)));
1782                                         free_canon_ace_list(file_ace);
1783                                         free_canon_ace_list(dir_ace);
1784                                         return False;
1785                                 }
1786
1787                                 if( DEBUGLVL( 10 )) {
1788                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1789                                         print_canon_ace( current_ace, 0);
1790                                 }
1791
1792                                 /*
1793                                  * If this is not an inherit only ACE we need to add a duplicate
1794                                  * to the file acl.
1795                                  */
1796
1797                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1798                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1799
1800                                         if (!dup_ace) {
1801                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1802                                                 free_canon_ace_list(file_ace);
1803                                                 free_canon_ace_list(dir_ace);
1804                                                 return False;
1805                                         }
1806
1807                                         /*
1808                                          * We must not free current_ace here as its
1809                                          * pointer is now owned by the dir_ace list.
1810                                          */
1811                                         current_ace = dup_ace;
1812                                         /* We've essentially split this ace into two,
1813                                          * and added the ace with inheritance request
1814                                          * bits to the directory ACL. Drop those bits for
1815                                          * the ACE we're adding to the file list. */
1816                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1817                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1818                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1819                                 } else {
1820                                         /*
1821                                          * We must not free current_ace here as its
1822                                          * pointer is now owned by the dir_ace list.
1823                                          */
1824                                         current_ace = NULL;
1825                                 }
1826
1827                                 /*
1828                                  * current_ace is now either owned by file_ace
1829                                  * or is NULL. We can safely operate on current_dir_ace
1830                                  * to treat mapping for default acl entries differently
1831                                  * than access acl entries.
1832                                  */
1833
1834                                 if (current_dir_ace->owner_type == UID_ACE) {
1835                                         /*
1836                                          * We already decided above this is a uid,
1837                                          * for default acls ace's only CREATOR_OWNER
1838                                          * maps to ACL_USER_OBJ. All other uid
1839                                          * ace's are ACL_USER.
1840                                          */
1841                                         if (dom_sid_equal(&current_dir_ace->trustee,
1842                                                         &global_sid_Creator_Owner)) {
1843                                                 current_dir_ace->type = SMB_ACL_USER_OBJ;
1844                                         } else {
1845                                                 current_dir_ace->type = SMB_ACL_USER;
1846                                         }
1847                                 }
1848
1849                                 if (current_dir_ace->owner_type == GID_ACE) {
1850                                         /*
1851                                          * We already decided above this is a gid,
1852                                          * for default acls ace's only CREATOR_GROUP
1853                                          * maps to ACL_GROUP_OBJ. All other uid
1854                                          * ace's are ACL_GROUP.
1855                                          */
1856                                         if (dom_sid_equal(&current_dir_ace->trustee,
1857                                                         &global_sid_Creator_Group)) {
1858                                                 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1859                                         } else {
1860                                                 current_dir_ace->type = SMB_ACL_GROUP;
1861                                         }
1862                                 }
1863                         }
1864                 }
1865
1866                 /*
1867                  * Only add to the file ACL if not inherit only.
1868                  */
1869
1870                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1871                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1872
1873                         /*
1874                          * Note if this was an allow ace. We can't process
1875                          * any further deny ace's after this.
1876                          */
1877
1878                         if (current_ace->attr == ALLOW_ACE)
1879                                 got_file_allow = True;
1880
1881                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1882                                 DEBUG(0,("create_canon_ace_lists: malformed "
1883                                          "ACL in file ACL ! Deny entry after "
1884                                          "Allow entry. Failing to set on file "
1885                                          "%s.\n", fsp_str_dbg(fsp)));
1886                                 free_canon_ace_list(file_ace);
1887                                 free_canon_ace_list(dir_ace);
1888                                 return False;
1889                         }
1890
1891                         if( DEBUGLVL( 10 )) {
1892                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1893                                 print_canon_ace( current_ace, 0);
1894                         }
1895                         all_aces_are_inherit_only = False;
1896                         /*
1897                          * We must not free current_ace here as its
1898                          * pointer is now owned by the file_ace list.
1899                          */
1900                         current_ace = NULL;
1901                 }
1902
1903                 /*
1904                  * Free if ACE was not added.
1905                  */
1906
1907                 SAFE_FREE(current_ace);
1908         }
1909
1910         if (fsp->is_directory && all_aces_are_inherit_only) {
1911                 /*
1912                  * Windows 2000 is doing one of these weird 'inherit acl'
1913                  * traverses to conserve NTFS ACL resources. Just pretend
1914                  * there was no DACL sent. JRA.
1915                  */
1916
1917                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1918                 free_canon_ace_list(file_ace);
1919                 free_canon_ace_list(dir_ace);
1920                 file_ace = NULL;
1921                 dir_ace = NULL;
1922         } else {
1923                 /*
1924                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
1925                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1926                  * entries can be converted to *_OBJ. Don't do this for the default
1927                  * ACL, we will create them separately for this if needed inside
1928                  * ensure_canon_entry_valid().
1929                  */
1930                 if (file_ace) {
1931                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1932                 }
1933         }
1934
1935         *ppfile_ace = file_ace;
1936         *ppdir_ace = dir_ace;
1937
1938         return True;
1939 }
1940
1941 /****************************************************************************
1942  ASCII art time again... JRA :-).
1943
1944  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1945  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1946  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1947  allow or deny have been merged, so the same SID can only appear once in the deny
1948  list or once in the allow list.
1949
1950  We then process as follows :
1951
1952  ---------------------------------------------------------------------------
1953  First pass - look for a Everyone DENY entry.
1954
1955  If it is deny all (rwx) trunate the list at this point.
1956  Else, walk the list from this point and use the deny permissions of this
1957  entry as a mask on all following allow entries. Finally, delete
1958  the Everyone DENY entry (we have applied it to everything possible).
1959
1960  In addition, in this pass we remove any DENY entries that have
1961  no permissions (ie. they are a DENY nothing).
1962  ---------------------------------------------------------------------------
1963  Second pass - only deal with deny user entries.
1964
1965  DENY user1 (perms XXX)
1966
1967  new_perms = 0
1968  for all following allow group entries where user1 is in group
1969         new_perms |= group_perms;
1970
1971  user1 entry perms = new_perms & ~ XXX;
1972
1973  Convert the deny entry to an allow entry with the new perms and
1974  push to the end of the list. Note if the user was in no groups
1975  this maps to a specific allow nothing entry for this user.
1976
1977  The common case from the NT ACL choser (userX deny all) is
1978  optimised so we don't do the group lookup - we just map to
1979  an allow nothing entry.
1980
1981  What we're doing here is inferring the allow permissions the
1982  person setting the ACE on user1 wanted by looking at the allow
1983  permissions on the groups the user is currently in. This will
1984  be a snapshot, depending on group membership but is the best
1985  we can do and has the advantage of failing closed rather than
1986  open.
1987  ---------------------------------------------------------------------------
1988  Third pass - only deal with deny group entries.
1989
1990  DENY group1 (perms XXX)
1991
1992  for all following allow user entries where user is in group1
1993    user entry perms = user entry perms & ~ XXX;
1994
1995  If there is a group Everyone allow entry with permissions YYY,
1996  convert the group1 entry to an allow entry and modify its
1997  permissions to be :
1998
1999  new_perms = YYY & ~ XXX
2000
2001  and push to the end of the list.
2002
2003  If there is no group Everyone allow entry then convert the
2004  group1 entry to a allow nothing entry and push to the end of the list.
2005
2006  Note that the common case from the NT ACL choser (groupX deny all)
2007  cannot be optimised here as we need to modify user entries who are
2008  in the group to change them to a deny all also.
2009
2010  What we're doing here is modifying the allow permissions of
2011  user entries (which are more specific in POSIX ACLs) to mask
2012  out the explicit deny set on the group they are in. This will
2013  be a snapshot depending on current group membership but is the
2014  best we can do and has the advantage of failing closed rather
2015  than open.
2016  ---------------------------------------------------------------------------
2017  Fourth pass - cope with cumulative permissions.
2018
2019  for all allow user entries, if there exists an allow group entry with
2020  more permissive permissions, and the user is in that group, rewrite the
2021  allow user permissions to contain both sets of permissions.
2022
2023  Currently the code for this is #ifdef'ed out as these semantics make
2024  no sense to me. JRA.
2025  ---------------------------------------------------------------------------
2026
2027  Note we *MUST* do the deny user pass first as this will convert deny user
2028  entries into allow user entries which can then be processed by the deny
2029  group pass.
2030
2031  The above algorithm took a *lot* of thinking about - hence this
2032  explaination :-). JRA.
2033 ****************************************************************************/
2034
2035 /****************************************************************************
2036  Process a canon_ace list entries. This is very complex code. We need
2037  to go through and remove the "deny" permissions from any allow entry that matches
2038  the id of this entry. We have already refused any NT ACL that wasn't in correct
2039  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2040  we just remove it (to fail safe). We have already removed any duplicate ace
2041  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2042  allow entries.
2043 ****************************************************************************/
2044
2045 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2046 {
2047         canon_ace *ace_list = *pp_ace_list;
2048         canon_ace *curr_ace = NULL;
2049         canon_ace *curr_ace_next = NULL;
2050
2051         /* Pass 1 above - look for an Everyone, deny entry. */
2052
2053         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2054                 canon_ace *allow_ace_p;
2055
2056                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2057
2058                 if (curr_ace->attr != DENY_ACE)
2059                         continue;
2060
2061                 if (curr_ace->perms == (mode_t)0) {
2062
2063                         /* Deny nothing entry - delete. */
2064
2065                         DLIST_REMOVE(ace_list, curr_ace);
2066                         continue;
2067                 }
2068
2069                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2070                         continue;
2071
2072                 /* JRATEST - assert. */
2073                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2074
2075                 if (curr_ace->perms == ALL_ACE_PERMS) {
2076
2077                         /*
2078                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2079                          * list at this point including this entry.
2080                          */
2081
2082                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2083
2084                         free_canon_ace_list( curr_ace );
2085                         if (prev_entry)
2086                                 DLIST_REMOVE(ace_list, prev_entry);
2087                         else {
2088                                 /* We deleted the entire list. */
2089                                 ace_list = NULL;
2090                         }
2091                         break;
2092                 }
2093
2094                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2095
2096                         /*
2097                          * Only mask off allow entries.
2098                          */
2099
2100                         if (allow_ace_p->attr != ALLOW_ACE)
2101                                 continue;
2102
2103                         allow_ace_p->perms &= ~curr_ace->perms;
2104                 }
2105
2106                 /*
2107                  * Now it's been applied, remove it.
2108                  */
2109
2110                 DLIST_REMOVE(ace_list, curr_ace);
2111         }
2112
2113         /* Pass 2 above - deal with deny user entries. */
2114
2115         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2116                 mode_t new_perms = (mode_t)0;
2117                 canon_ace *allow_ace_p;
2118
2119                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2120
2121                 if (curr_ace->attr != DENY_ACE)
2122                         continue;
2123
2124                 if (curr_ace->owner_type != UID_ACE)
2125                         continue;
2126
2127                 if (curr_ace->perms == ALL_ACE_PERMS) {
2128
2129                         /*
2130                          * Optimisation - this is a deny everything to this user.
2131                          * Convert to an allow nothing and push to the end of the list.
2132                          */
2133
2134                         curr_ace->attr = ALLOW_ACE;
2135                         curr_ace->perms = (mode_t)0;
2136                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2137                         continue;
2138                 }
2139
2140                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2141
2142                         if (allow_ace_p->attr != ALLOW_ACE)
2143                                 continue;
2144
2145                         /* We process GID_ACE and WORLD_ACE entries only. */
2146
2147                         if (allow_ace_p->owner_type == UID_ACE)
2148                                 continue;
2149
2150                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2151                                 new_perms |= allow_ace_p->perms;
2152                 }
2153
2154                 /*
2155                  * Convert to a allow entry, modify the perms and push to the end
2156                  * of the list.
2157                  */
2158
2159                 curr_ace->attr = ALLOW_ACE;
2160                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2161                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2162         }
2163
2164         /* Pass 3 above - deal with deny group entries. */
2165
2166         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2167                 canon_ace *allow_ace_p;
2168                 canon_ace *allow_everyone_p = NULL;
2169
2170                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2171
2172                 if (curr_ace->attr != DENY_ACE)
2173                         continue;
2174
2175                 if (curr_ace->owner_type != GID_ACE)
2176                         continue;
2177
2178                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2179
2180                         if (allow_ace_p->attr != ALLOW_ACE)
2181                                 continue;
2182
2183                         /* Store a pointer to the Everyone allow, if it exists. */
2184                         if (allow_ace_p->owner_type == WORLD_ACE)
2185                                 allow_everyone_p = allow_ace_p;
2186
2187                         /* We process UID_ACE entries only. */
2188
2189                         if (allow_ace_p->owner_type != UID_ACE)
2190                                 continue;
2191
2192                         /* Mask off the deny group perms. */
2193
2194                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2195                                 allow_ace_p->perms &= ~curr_ace->perms;
2196                 }
2197
2198                 /*
2199                  * Convert the deny to an allow with the correct perms and
2200                  * push to the end of the list.
2201                  */
2202
2203                 curr_ace->attr = ALLOW_ACE;
2204                 if (allow_everyone_p)
2205                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2206                 else
2207                         curr_ace->perms = (mode_t)0;
2208                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2209         }
2210
2211         /* Doing this fourth pass allows Windows semantics to be layered
2212          * on top of POSIX semantics. I'm not sure if this is desirable.
2213          * For example, in W2K ACLs there is no way to say, "Group X no
2214          * access, user Y full access" if user Y is a member of group X.
2215          * This seems completely broken semantics to me.... JRA.
2216          */
2217
2218 #if 0
2219         /* Pass 4 above - deal with allow entries. */
2220
2221         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2222                 canon_ace *allow_ace_p;
2223
2224                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2225
2226                 if (curr_ace->attr != ALLOW_ACE)
2227                         continue;
2228
2229                 if (curr_ace->owner_type != UID_ACE)
2230                         continue;
2231
2232                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2233
2234                         if (allow_ace_p->attr != ALLOW_ACE)
2235                                 continue;
2236
2237                         /* We process GID_ACE entries only. */
2238
2239                         if (allow_ace_p->owner_type != GID_ACE)
2240                                 continue;
2241
2242                         /* OR in the group perms. */
2243
2244                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2245                                 curr_ace->perms |= allow_ace_p->perms;
2246                 }
2247         }
2248 #endif
2249
2250         *pp_ace_list = ace_list;
2251 }
2252
2253 /****************************************************************************
2254  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2255  succeeding.
2256 ****************************************************************************/
2257
2258 static bool unpack_canon_ace(files_struct *fsp,
2259                                 const SMB_STRUCT_STAT *pst,
2260                                 struct dom_sid *pfile_owner_sid,
2261                                 struct dom_sid *pfile_grp_sid,
2262                                 canon_ace **ppfile_ace,
2263                                 canon_ace **ppdir_ace,
2264                                 uint32 security_info_sent,
2265                                 const struct security_descriptor *psd)
2266 {
2267         canon_ace *file_ace = NULL;
2268         canon_ace *dir_ace = NULL;
2269
2270         *ppfile_ace = NULL;
2271         *ppdir_ace = NULL;
2272
2273         if(security_info_sent == 0) {
2274                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2275                 return False;
2276         }
2277
2278         /*
2279          * If no DACL then this is a chown only security descriptor.
2280          */
2281
2282         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2283                 return True;
2284
2285         /*
2286          * Now go through the DACL and create the canon_ace lists.
2287          */
2288
2289         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2290                                                                 &file_ace, &dir_ace, psd->dacl))
2291                 return False;
2292
2293         if ((file_ace == NULL) && (dir_ace == NULL)) {
2294                 /* W2K traverse DACL set - ignore. */
2295                 return True;
2296         }
2297
2298         /*
2299          * Go through the canon_ace list and merge entries
2300          * belonging to identical users of identical allow or deny type.
2301          * We can do this as all deny entries come first, followed by
2302          * all allow entries (we have mandated this before accepting this acl).
2303          */
2304
2305         print_canon_ace_list( "file ace - before merge", file_ace);
2306         merge_aces( &file_ace, false);
2307
2308         print_canon_ace_list( "dir ace - before merge", dir_ace);
2309         merge_aces( &dir_ace, true);
2310
2311         /*
2312          * NT ACLs are order dependent. Go through the acl lists and
2313          * process DENY entries by masking the allow entries.
2314          */
2315
2316         print_canon_ace_list( "file ace - before deny", file_ace);
2317         process_deny_list(fsp->conn, &file_ace);
2318
2319         print_canon_ace_list( "dir ace - before deny", dir_ace);
2320         process_deny_list(fsp->conn, &dir_ace);
2321
2322         /*
2323          * A well formed POSIX file or default ACL has at least 3 entries, a
2324          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2325          * and optionally a mask entry. Ensure this is the case.
2326          */
2327
2328         print_canon_ace_list( "file ace - before valid", file_ace);
2329
2330         if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2331                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2332                 free_canon_ace_list(file_ace);
2333                 free_canon_ace_list(dir_ace);
2334                 return False;
2335         }
2336
2337         print_canon_ace_list( "dir ace - before valid", dir_ace);
2338
2339         if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2340                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2341                 free_canon_ace_list(file_ace);
2342                 free_canon_ace_list(dir_ace);
2343                 return False;
2344         }
2345
2346         print_canon_ace_list( "file ace - return", file_ace);
2347         print_canon_ace_list( "dir ace - return", dir_ace);
2348
2349         *ppfile_ace = file_ace;
2350         *ppdir_ace = dir_ace;
2351         return True;
2352
2353 }
2354
2355 /******************************************************************************
2356  When returning permissions, try and fit NT display
2357  semantics if possible. Note the the canon_entries here must have been malloced.
2358  The list format should be - first entry = owner, followed by group and other user
2359  entries, last entry = other.
2360
2361  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2362  are not ordered, and match on the most specific entry rather than walking a list,
2363  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2364
2365  Entry 0: owner : deny all except read and write.
2366  Entry 1: owner : allow read and write.
2367  Entry 2: group : deny all except read.
2368  Entry 3: group : allow read.
2369  Entry 4: Everyone : allow read.
2370
2371  But NT cannot display this in their ACL editor !
2372 ********************************************************************************/
2373
2374 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2375 {
2376         canon_ace *l_head = *pp_list_head;
2377         canon_ace *owner_ace = NULL;
2378         canon_ace *other_ace = NULL;
2379         canon_ace *ace = NULL;
2380
2381         for (ace = l_head; ace; ace = ace->next) {
2382                 if (ace->type == SMB_ACL_USER_OBJ)
2383                         owner_ace = ace;
2384                 else if (ace->type == SMB_ACL_OTHER) {
2385                         /* Last ace - this is "other" */
2386                         other_ace = ace;
2387                 }
2388         }
2389
2390         if (!owner_ace || !other_ace) {
2391                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2392                         filename ));
2393                 return;
2394         }
2395
2396         /*
2397          * The POSIX algorithm applies to owner first, and other last,
2398          * so ensure they are arranged in this order.
2399          */
2400
2401         if (owner_ace) {
2402                 DLIST_PROMOTE(l_head, owner_ace);
2403         }
2404
2405         if (other_ace) {
2406                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2407         }
2408
2409         /* We have probably changed the head of the list. */
2410
2411         *pp_list_head = l_head;
2412 }
2413
2414 /****************************************************************************
2415  Create a linked list of canonical ACE entries.
2416 ****************************************************************************/
2417
2418 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2419                                    const char *fname, SMB_ACL_T posix_acl,
2420                                    const SMB_STRUCT_STAT *psbuf,
2421                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2422 {
2423         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2424         canon_ace *l_head = NULL;
2425         canon_ace *ace = NULL;
2426         canon_ace *next_ace = NULL;
2427         int entry_id = SMB_ACL_FIRST_ENTRY;
2428         SMB_ACL_ENTRY_T entry;
2429         size_t ace_count;
2430
2431         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2432                 SMB_ACL_TAG_T tagtype;
2433                 SMB_ACL_PERMSET_T permset;
2434                 struct dom_sid sid;
2435                 posix_id unix_ug;
2436                 enum ace_owner owner_type;
2437
2438                 entry_id = SMB_ACL_NEXT_ENTRY;
2439
2440                 /* Is this a MASK entry ? */
2441                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2442                         continue;
2443
2444                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2445                         continue;
2446
2447                 /* Decide which SID to use based on the ACL type. */
2448                 switch(tagtype) {
2449                         case SMB_ACL_USER_OBJ:
2450                                 /* Get the SID from the owner. */
2451                                 sid_copy(&sid, powner);
2452                                 unix_ug.uid = psbuf->st_ex_uid;
2453                                 owner_type = UID_ACE;
2454                                 break;
2455                         case SMB_ACL_USER:
2456                                 {
2457                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2458                                         if (puid == NULL) {
2459                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2460                                                 continue;
2461                                         }
2462                                         uid_to_sid( &sid, *puid);
2463                                         unix_ug.uid = *puid;
2464                                         owner_type = UID_ACE;
2465                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2466                                         break;
2467                                 }
2468                         case SMB_ACL_GROUP_OBJ:
2469                                 /* Get the SID from the owning group. */
2470                                 sid_copy(&sid, pgroup);
2471                                 unix_ug.gid = psbuf->st_ex_gid;
2472                                 owner_type = GID_ACE;
2473                                 break;
2474                         case SMB_ACL_GROUP:
2475                                 {
2476                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2477                                         if (pgid == NULL) {
2478                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2479                                                 continue;
2480                                         }
2481                                         gid_to_sid( &sid, *pgid);
2482                                         unix_ug.gid = *pgid;
2483                                         owner_type = GID_ACE;
2484                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2485                                         break;
2486                                 }
2487                         case SMB_ACL_MASK:
2488                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2489                                 continue; /* Don't count the mask as an entry. */
2490                         case SMB_ACL_OTHER:
2491                                 /* Use the Everyone SID */
2492                                 sid = global_sid_World;
2493                                 unix_ug.world = -1;
2494                                 owner_type = WORLD_ACE;
2495                                 break;
2496                         default:
2497                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2498                                 continue;
2499                 }
2500
2501                 /*
2502                  * Add this entry to the list.
2503                  */
2504
2505                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2506                         goto fail;
2507
2508                 ZERO_STRUCTP(ace);
2509                 ace->type = tagtype;
2510                 ace->perms = convert_permset_to_mode_t(conn, permset);
2511                 ace->attr = ALLOW_ACE;
2512                 ace->trustee = sid;
2513                 ace->unix_ug = unix_ug;
2514                 ace->owner_type = owner_type;
2515                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2516
2517                 DLIST_ADD(l_head, ace);
2518         }
2519
2520         /*
2521          * This next call will ensure we have at least a user/group/world set.
2522          */
2523
2524         if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2525                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2526                                       psbuf, False))
2527                 goto fail;
2528
2529         /*
2530          * Now go through the list, masking the permissions with the
2531          * acl_mask. Ensure all DENY Entries are at the start of the list.
2532          */
2533
2534         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2535
2536         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2537                 next_ace = ace->next;
2538
2539                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2540                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2541                         ace->perms &= acl_mask;
2542
2543                 if (ace->perms == 0) {
2544                         DLIST_PROMOTE(l_head, ace);
2545                 }
2546
2547                 if( DEBUGLVL( 10 ) ) {
2548                         print_canon_ace(ace, ace_count);
2549                 }
2550         }
2551
2552         arrange_posix_perms(fname,&l_head );
2553
2554         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2555
2556         return l_head;
2557
2558   fail:
2559
2560         free_canon_ace_list(l_head);
2561         return NULL;
2562 }
2563
2564 /****************************************************************************
2565  Check if the current user group list contains a given group.
2566 ****************************************************************************/
2567
2568 bool current_user_in_group(connection_struct *conn, gid_t gid)
2569 {
2570         int i;
2571         const struct security_unix_token *utok = get_current_utok(conn);
2572
2573         for (i = 0; i < utok->ngroups; i++) {
2574                 if (utok->groups[i] == gid) {
2575                         return True;
2576                 }
2577         }
2578
2579         return False;
2580 }
2581
2582 /****************************************************************************
2583  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2584 ****************************************************************************/
2585
2586 static bool acl_group_override(connection_struct *conn,
2587                                const struct smb_filename *smb_fname)
2588 {
2589         if ((errno != EPERM) && (errno != EACCES)) {
2590                 return false;
2591         }
2592
2593         /* file primary group == user primary or supplementary group */
2594         if (lp_acl_group_control(SNUM(conn)) &&
2595             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2596                 return true;
2597         }
2598
2599         /* user has writeable permission */
2600         if (lp_dos_filemode(SNUM(conn)) &&
2601             can_write_to_file(conn, smb_fname)) {
2602                 return true;
2603         }
2604
2605         return false;
2606 }
2607
2608 /****************************************************************************
2609  Attempt to apply an ACL to a file or directory.
2610 ****************************************************************************/
2611
2612 static bool set_canon_ace_list(files_struct *fsp,
2613                                 canon_ace *the_ace,
2614                                 bool default_ace,
2615                                 const SMB_STRUCT_STAT *psbuf,
2616                                 bool *pacl_set_support)
2617 {
2618         connection_struct *conn = fsp->conn;
2619         bool ret = False;
2620         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2621         canon_ace *p_ace;
2622         int i;
2623         SMB_ACL_ENTRY_T mask_entry;
2624         bool got_mask_entry = False;
2625         SMB_ACL_PERMSET_T mask_permset;
2626         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2627         bool needs_mask = False;
2628         mode_t mask_perms = 0;
2629
2630         /* Use the psbuf that was passed in. */
2631         if (psbuf != &fsp->fsp_name->st) {
2632                 fsp->fsp_name->st = *psbuf;
2633         }
2634
2635 #if defined(POSIX_ACL_NEEDS_MASK)
2636         /* HP-UX always wants to have a mask (called "class" there). */
2637         needs_mask = True;
2638 #endif
2639
2640         if (the_acl == NULL) {
2641
2642                 if (!no_acl_syscall_error(errno)) {
2643                         /*
2644                          * Only print this error message if we have some kind of ACL
2645                          * support that's not working. Otherwise we would always get this.
2646                          */
2647                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2648                                 default_ace ? "default" : "file", strerror(errno) ));
2649                 }
2650                 *pacl_set_support = False;
2651                 goto fail;
2652         }
2653
2654         if( DEBUGLVL( 10 )) {
2655                 dbgtext("set_canon_ace_list: setting ACL:\n");
2656                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2657                         print_canon_ace( p_ace, i);
2658                 }
2659         }
2660
2661         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2662                 SMB_ACL_ENTRY_T the_entry;
2663                 SMB_ACL_PERMSET_T the_permset;
2664
2665                 /*
2666                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2667                  * named group entries. But if there is an ACL_MASK entry, it applies
2668                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2669                  * so that it doesn't deny (i.e., mask off) any permissions.
2670                  */
2671
2672                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2673                         needs_mask = True;
2674                         mask_perms |= p_ace->perms;
2675                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2676                         mask_perms |= p_ace->perms;
2677                 }
2678
2679                 /*
2680                  * Get the entry for this ACE.
2681                  */
2682
2683                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2684                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2685                                 i, strerror(errno) ));
2686                         goto fail;
2687                 }
2688
2689                 if (p_ace->type == SMB_ACL_MASK) {
2690                         mask_entry = the_entry;
2691                         got_mask_entry = True;
2692                 }
2693
2694                 /*
2695                  * Ok - we now know the ACL calls should be working, don't
2696                  * allow fallback to chmod.
2697                  */
2698
2699                 *pacl_set_support = True;
2700
2701                 /*
2702                  * Initialise the entry from the canon_ace.
2703                  */
2704
2705                 /*
2706                  * First tell the entry what type of ACE this is.
2707                  */
2708
2709                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2710                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2711                                 i, strerror(errno) ));
2712                         goto fail;
2713                 }
2714
2715                 /*
2716                  * Only set the qualifier (user or group id) if the entry is a user
2717                  * or group id ACE.
2718                  */
2719
2720                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2721                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2722                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2723                                         i, strerror(errno) ));
2724                                 goto fail;
2725                         }
2726                 }
2727
2728                 /*
2729                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2730                  */
2731
2732                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2733                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2734                                 i, strerror(errno) ));
2735                         goto fail;
2736                 }
2737
2738                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2739                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2740                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2741                         goto fail;
2742                 }
2743
2744                 /*
2745                  * ..and apply them to the entry.
2746                  */
2747
2748                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2749                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2750                                 i, strerror(errno) ));
2751                         goto fail;
2752                 }
2753
2754                 if( DEBUGLVL( 10 ))
2755                         print_canon_ace( p_ace, i);
2756
2757         }
2758
2759         if (needs_mask && !got_mask_entry) {
2760                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2761                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2762                         goto fail;
2763                 }
2764
2765                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2766                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2767                         goto fail;
2768                 }
2769
2770                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2771                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2772                         goto fail;
2773                 }
2774
2775                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2776                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2777                         goto fail;
2778                 }
2779
2780                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2781                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2782                         goto fail;
2783                 }
2784         }
2785
2786         /*
2787          * Finally apply it to the file or directory.
2788          */
2789
2790         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2791                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2792                                              the_acl_type, the_acl) == -1) {
2793                         /*
2794                          * Some systems allow all the above calls and only fail with no ACL support
2795                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2796                          */
2797                         if (no_acl_syscall_error(errno)) {
2798                                 *pacl_set_support = False;
2799                         }
2800
2801                         if (acl_group_override(conn, fsp->fsp_name)) {
2802                                 int sret;
2803
2804                                 DEBUG(5,("set_canon_ace_list: acl group "
2805                                          "control on and current user in file "
2806                                          "%s primary group.\n",
2807                                          fsp_str_dbg(fsp)));
2808
2809                                 become_root();
2810                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2811                                     fsp->fsp_name->base_name, the_acl_type,
2812                                     the_acl);
2813                                 unbecome_root();
2814                                 if (sret == 0) {
2815                                         ret = True;
2816                                 }
2817                         }
2818
2819                         if (ret == False) {
2820                                 DEBUG(2,("set_canon_ace_list: "
2821                                          "sys_acl_set_file type %s failed for "
2822                                          "file %s (%s).\n",
2823                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2824                                          "directory default" : "file",
2825                                          fsp_str_dbg(fsp), strerror(errno)));
2826                                 goto fail;
2827                         }
2828                 }
2829         } else {
2830                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2831                         /*
2832                          * Some systems allow all the above calls and only fail with no ACL support
2833                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2834                          */
2835                         if (no_acl_syscall_error(errno)) {
2836                                 *pacl_set_support = False;
2837                         }
2838
2839                         if (acl_group_override(conn, fsp->fsp_name)) {
2840                                 int sret;
2841
2842                                 DEBUG(5,("set_canon_ace_list: acl group "
2843                                          "control on and current user in file "
2844                                          "%s primary group.\n",
2845                                          fsp_str_dbg(fsp)));
2846
2847                                 become_root();
2848                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2849                                 unbecome_root();
2850                                 if (sret == 0) {
2851                                         ret = True;
2852                                 }
2853                         }
2854
2855                         if (ret == False) {
2856                                 DEBUG(2,("set_canon_ace_list: "
2857                                          "sys_acl_set_file failed for file %s "
2858                                          "(%s).\n",
2859                                          fsp_str_dbg(fsp), strerror(errno)));
2860                                 goto fail;
2861                         }
2862                 }
2863         }
2864
2865         ret = True;
2866
2867   fail:
2868
2869         if (the_acl != NULL) {
2870                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2871         }
2872
2873         return ret;
2874 }
2875
2876 /****************************************************************************
2877  Find a particular canon_ace entry.
2878 ****************************************************************************/
2879
2880 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2881 {
2882         while (list) {
2883                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2884                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2885                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2886                         break;
2887                 list = list->next;
2888         }
2889         return list;
2890 }
2891
2892 /****************************************************************************
2893
2894 ****************************************************************************/
2895
2896 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2897 {
2898         SMB_ACL_ENTRY_T entry;
2899
2900         if (!the_acl)
2901                 return NULL;
2902         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2903                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2904                 return NULL;
2905         }
2906         return the_acl;
2907 }
2908
2909 /****************************************************************************
2910  Convert a canon_ace to a generic 3 element permission - if possible.
2911 ****************************************************************************/
2912
2913 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2914
2915 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2916 {
2917         int snum = SNUM(fsp->conn);
2918         size_t ace_count = count_canon_ace_list(file_ace_list);
2919         canon_ace *ace_p;
2920         canon_ace *owner_ace = NULL;
2921         canon_ace *group_ace = NULL;
2922         canon_ace *other_ace = NULL;
2923         mode_t and_bits;
2924         mode_t or_bits;
2925
2926         if (ace_count != 3) {
2927                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2928                          "entries for file %s to convert to posix perms.\n",
2929                          fsp_str_dbg(fsp)));
2930                 return False;
2931         }
2932
2933         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2934                 if (ace_p->owner_type == UID_ACE)
2935                         owner_ace = ace_p;
2936                 else if (ace_p->owner_type == GID_ACE)
2937                         group_ace = ace_p;
2938                 else if (ace_p->owner_type == WORLD_ACE)
2939                         other_ace = ace_p;
2940         }
2941
2942         if (!owner_ace || !group_ace || !other_ace) {
2943                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
2944                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
2945                 return False;
2946         }
2947
2948         *posix_perms = (mode_t)0;
2949
2950         *posix_perms |= owner_ace->perms;
2951         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2952         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2953         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2954         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2955         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2956         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2957
2958         /* The owner must have at least read access. */
2959
2960         *posix_perms |= S_IRUSR;
2961         if (fsp->is_directory)
2962                 *posix_perms |= (S_IWUSR|S_IXUSR);
2963
2964         /* If requested apply the masks. */
2965
2966         /* Get the initial bits to apply. */
2967
2968         if (fsp->is_directory) {
2969                 and_bits = lp_dir_security_mask(snum);
2970                 or_bits = lp_force_dir_security_mode(snum);
2971         } else {
2972                 and_bits = lp_security_mask(snum);
2973                 or_bits = lp_force_security_mode(snum);
2974         }
2975
2976         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2977
2978         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
2979                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
2980                   (int)group_ace->perms, (int)other_ace->perms,
2981                   (int)*posix_perms, fsp_str_dbg(fsp)));
2982
2983         return True;
2984 }
2985
2986 /****************************************************************************
2987   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2988   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2989   with CI|OI set so it is inherited and also applies to the directory.
2990   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2991 ****************************************************************************/
2992
2993 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
2994 {
2995         size_t i, j;
2996
2997         for (i = 0; i < num_aces; i++) {
2998                 for (j = i+1; j < num_aces; j++) {
2999                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3000                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3001                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3002                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3003
3004                         /* We know the lower number ACE's are file entries. */
3005                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3006                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3007                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3008                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3009                                 (i_inh == j_inh) &&
3010                                 (i_flags_ni == 0) &&
3011                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3012                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3013                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3014                                 /*
3015                                  * W2K wants to have access allowed zero access ACE's
3016                                  * at the end of the list. If the mask is zero, merge
3017                                  * the non-inherited ACE onto the inherited ACE.
3018                                  */
3019
3020                                 if (nt_ace_list[i].access_mask == 0) {
3021                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3022                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3023                                         if (num_aces - i - 1 > 0)
3024                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3025                                                                 sizeof(struct security_ace));
3026
3027                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3028                                                 (unsigned int)i, (unsigned int)j ));
3029                                 } else {
3030                                         /*
3031                                          * These are identical except for the flags.
3032                                          * Merge the inherited ACE onto the non-inherited ACE.
3033                                          */
3034
3035                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3036                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3037                                         if (num_aces - j - 1 > 0)
3038                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3039                                                                 sizeof(struct security_ace));
3040
3041                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3042                                                 (unsigned int)j, (unsigned int)i ));
3043                                 }
3044                                 num_aces--;
3045                                 break;
3046                         }
3047                 }
3048         }
3049
3050         return num_aces;
3051 }
3052
3053 /*
3054  * Add or Replace ACE entry.
3055  * In some cases we need to add a specific ACE for compatibility reasons.
3056  * When doing that we must make sure we are not actually creating a duplicate
3057  * entry. So we need to search whether an ACE entry already exist and eventually
3058  * replacce the access mask, or add a completely new entry if none was found.
3059  *
3060  * This function assumes the array has enough space to add a new entry without
3061  * any reallocation of memory.
3062  */
3063
3064 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3065                                 const struct dom_sid *sid, enum security_ace_type type,
3066                                 uint32_t mask, uint8_t flags)
3067 {
3068         int i;
3069
3070         /* first search for a duplicate */
3071         for (i = 0; i < *num_aces; i++) {
3072                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3073                     (nt_ace_list[i].flags == flags)) break;
3074         }
3075
3076         if (i < *num_aces) { /* found */
3077                 nt_ace_list[i].type = type;
3078                 nt_ace_list[i].access_mask = mask;
3079                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3080                            i, sid_string_dbg(sid), flags));
3081                 return;
3082         }
3083
3084         /* not found, append it */
3085         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3086 }
3087
3088
3089 /****************************************************************************
3090  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3091  the space for the return elements and returns the size needed to return the
3092  security descriptor. This should be the only external function needed for
3093  the UNIX style get ACL.
3094 ****************************************************************************/
3095
3096 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3097                                       const char *name,
3098                                       const SMB_STRUCT_STAT *sbuf,
3099                                       struct pai_val *pal,
3100                                       SMB_ACL_T posix_acl,
3101                                       SMB_ACL_T def_acl,
3102                                       uint32_t security_info,
3103                                       struct security_descriptor **ppdesc)
3104 {
3105         struct dom_sid owner_sid;
3106         struct dom_sid group_sid;
3107         size_t sd_size = 0;
3108         struct security_acl *psa = NULL;
3109         size_t num_acls = 0;
3110         size_t num_def_acls = 0;
3111         size_t num_aces = 0;
3112         canon_ace *file_ace = NULL;
3113         canon_ace *dir_ace = NULL;
3114         struct security_ace *nt_ace_list = NULL;
3115         size_t num_profile_acls = 0;
3116         struct dom_sid orig_owner_sid;
3117         struct security_descriptor *psd = NULL;
3118         int i;
3119
3120         /*
3121          * Get the owner, group and world SIDs.
3122          */
3123
3124         create_file_sids(sbuf, &owner_sid, &group_sid);
3125
3126         if (lp_profile_acls(SNUM(conn))) {
3127                 /* For WXP SP1 the owner must be administrators. */
3128                 sid_copy(&orig_owner_sid, &owner_sid);
3129                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3130                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3131                 num_profile_acls = 3;
3132         }
3133
3134         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3135
3136                 /*
3137                  * In the optimum case Creator Owner and Creator Group would be used for
3138                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3139                  * would lead to usability problems under Windows: The Creator entries
3140                  * are only available in browse lists of directories and not for files;
3141                  * additionally the identity of the owning group couldn't be determined.
3142                  * We therefore use those identities only for Default ACLs.
3143                  */
3144
3145                 /* Create the canon_ace lists. */
3146                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3147                                             &owner_sid, &group_sid, pal,
3148                                             SMB_ACL_TYPE_ACCESS);
3149
3150                 /* We must have *some* ACLS. */
3151
3152                 if (count_canon_ace_list(file_ace) == 0) {
3153                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3154                         goto done;
3155                 }
3156
3157                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3158                         dir_ace = canonicalise_acl(conn, name, def_acl,
3159                                                    sbuf,
3160                                                    &global_sid_Creator_Owner,
3161                                                    &global_sid_Creator_Group,
3162                                                    pal, SMB_ACL_TYPE_DEFAULT);
3163                 }
3164
3165                 /*
3166                  * Create the NT ACE list from the canonical ace lists.
3167                  */
3168
3169                 {
3170                         canon_ace *ace;
3171                         enum security_ace_type nt_acl_type;
3172
3173                         if (nt4_compatible_acls() && dir_ace) {
3174                                 /*
3175                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3176                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3177                                  * remove entries from the Access ACL if the
3178                                  * corresponding Default ACL entries have also been
3179                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3180                                  * are exceptions. We can do nothing
3181                                  * intelligent if the Default ACL contains entries that
3182                                  * are not also contained in the Access ACL, so this
3183                                  * case will still fail under NT 4.
3184                                  */
3185
3186                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3187                                 if (ace && !ace->perms) {
3188                                         DLIST_REMOVE(dir_ace, ace);
3189                                         SAFE_FREE(ace);
3190
3191                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3192                                         if (ace && !ace->perms) {
3193                                                 DLIST_REMOVE(file_ace, ace);
3194                                                 SAFE_FREE(ace);
3195                                         }
3196                                 }
3197
3198                                 /*
3199                                  * WinNT doesn't usually have Creator Group
3200                                  * in browse lists, so we send this entry to
3201                                  * WinNT even if it contains no relevant
3202                                  * permissions. Once we can add
3203                                  * Creator Group to browse lists we can
3204                                  * re-enable this.
3205                                  */
3206
3207 #if 0
3208                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3209                                 if (ace && !ace->perms) {
3210                                         DLIST_REMOVE(dir_ace, ace);
3211                                         SAFE_FREE(ace);
3212                                 }
3213 #endif
3214
3215                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3216                                 if (ace && !ace->perms) {
3217                                         DLIST_REMOVE(file_ace, ace);
3218                                         SAFE_FREE(ace);
3219                                 }
3220                         }
3221
3222                         num_acls = count_canon_ace_list(file_ace);
3223                         num_def_acls = count_canon_ace_list(dir_ace);
3224
3225                         /* Allocate the ace list. */
3226                         if ((nt_ace_list = SMB_MALLOC_ARRAY(struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3227                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3228                                 goto done;
3229                         }
3230
3231                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3232
3233                         /*
3234                          * Create the NT ACE list from the canonical ace lists.
3235                          */
3236
3237                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3238                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3239                                                 &nt_acl_type,
3240                                                 ace->perms,
3241                                                 S_ISDIR(sbuf->st_ex_mode));
3242                                 init_sec_ace(&nt_ace_list[num_aces++],
3243                                         &ace->trustee,
3244                                         nt_acl_type,
3245                                         acc,
3246                                         ace->ace_flags);
3247                         }
3248
3249                         /* The User must have access to a profile share - even
3250                          * if we can't map the SID. */
3251                         if (lp_profile_acls(SNUM(conn))) {
3252                                 add_or_replace_ace(nt_ace_list, &num_aces,
3253                                                    &global_sid_Builtin_Users,
3254                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3255                                                    FILE_GENERIC_ALL, 0);
3256                         }
3257
3258                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3259                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3260                                                 &nt_acl_type,
3261                                                 ace->perms,
3262                                                 S_ISDIR(sbuf->st_ex_mode));
3263                                 init_sec_ace(&nt_ace_list[num_aces++],
3264                                         &ace->trustee,
3265                                         nt_acl_type,
3266                                         acc,
3267                                         ace->ace_flags |
3268                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3269                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3270                                         SEC_ACE_FLAG_INHERIT_ONLY);
3271                         }
3272
3273                         /* The User must have access to a profile share - even
3274                          * if we can't map the SID. */
3275                         if (lp_profile_acls(SNUM(conn))) {
3276                                 add_or_replace_ace(nt_ace_list, &num_aces,
3277                                                 &global_sid_Builtin_Users,
3278                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3279                                                 FILE_GENERIC_ALL,
3280                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3281                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3282                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3283                         }
3284
3285                         /*
3286                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3287                          * Win2K needs this to get the inheritance correct when replacing ACLs
3288                          * on a directory tree. Based on work by Jim @ IBM.
3289                          */
3290
3291                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3292
3293                         if (lp_profile_acls(SNUM(conn))) {
3294                                 for (i = 0; i < num_aces; i++) {
3295                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3296                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3297                                                                    &orig_owner_sid,
3298                                                                    nt_ace_list[i].type,
3299                                                                    nt_ace_list[i].access_mask,
3300                                                                    nt_ace_list[i].flags);
3301                                                 break;
3302                                         }
3303                                 }
3304                         }
3305                 }
3306
3307                 if (num_aces) {
3308                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3309                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3310                                 goto done;
3311                         }
3312                 }
3313         } /* security_info & SECINFO_DACL */
3314
3315         psd = make_standard_sec_desc( talloc_tos(),
3316                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3317                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3318                         psa,
3319                         &sd_size);
3320
3321         if(!psd) {
3322                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3323                 sd_size = 0;
3324                 goto done;
3325         }
3326
3327         /*
3328          * Windows 2000: The DACL_PROTECTED flag in the security
3329          * descriptor marks the ACL as non-inheriting, i.e., no
3330          * ACEs from higher level directories propagate to this
3331          * ACL. In the POSIX ACL model permissions are only
3332          * inherited at file create time, so ACLs never contain
3333          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3334          * flag doesn't seem to bother Windows NT.
3335          * Always set this if map acl inherit is turned off.
3336          */
3337         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3338                 psd->type |= SEC_DESC_DACL_PROTECTED;
3339         } else {
3340                 psd->type |= pal->sd_type;
3341         }
3342
3343         if (psd->dacl) {
3344                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3345         }
3346
3347         *ppdesc = psd;
3348
3349  done:
3350
3351         if (posix_acl) {
3352                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3353         }
3354         if (def_acl) {
3355                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3356         }
3357         free_canon_ace_list(file_ace);
3358         free_canon_ace_list(dir_ace);
3359         free_inherited_info(pal);
3360         SAFE_FREE(nt_ace_list);
3361
3362         return NT_STATUS_OK;
3363 }
3364
3365 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3366                            struct security_descriptor **ppdesc)
3367 {
3368         SMB_STRUCT_STAT sbuf;
3369         SMB_ACL_T posix_acl = NULL;
3370         struct pai_val *pal;
3371
3372         *ppdesc = NULL;
3373
3374         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3375                   fsp_str_dbg(fsp)));
3376
3377         /* can it happen that fsp_name == NULL ? */
3378         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3379                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3380                                         security_info, ppdesc);
3381         }
3382
3383         /* Get the stat struct for the owner info. */
3384         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3385                 return map_nt_error_from_unix(errno);
3386         }
3387
3388         /* Get the ACL from the fd. */
3389         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3390
3391         pal = fload_inherited_info(fsp);
3392
3393         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3394                                        &sbuf, pal, posix_acl, NULL,
3395                                        security_info, ppdesc);
3396 }
3397
3398 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3399                           uint32_t security_info, struct security_descriptor **ppdesc)
3400 {
3401         SMB_ACL_T posix_acl = NULL;
3402         SMB_ACL_T def_acl = NULL;
3403         struct pai_val *pal;
3404         struct smb_filename smb_fname;
3405         int ret;
3406
3407         *ppdesc = NULL;
3408
3409         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3410
3411         ZERO_STRUCT(smb_fname);
3412         smb_fname.base_name = discard_const_p(char, name);
3413
3414         /* Get the stat struct for the owner info. */
3415         if (lp_posix_pathnames()) {
3416                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3417         } else {
3418                 ret = SMB_VFS_STAT(conn, &smb_fname);
3419         }
3420
3421         if (ret == -1) {
3422                 return map_nt_error_from_unix(errno);
3423         }
3424
3425         /* Get the ACL from the path. */
3426         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3427
3428         /* If it's a directory get the default POSIX ACL. */
3429         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3430                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3431                 def_acl = free_empty_sys_acl(conn, def_acl);
3432         }
3433
3434         pal = load_inherited_info(conn, name);
3435
3436         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3437                                        posix_acl, def_acl, security_info,
3438                                        ppdesc);
3439 }
3440
3441 /****************************************************************************
3442  Try to chown a file. We will be able to chown it under the following conditions.
3443
3444   1) If we have root privileges, then it will just work.
3445   2) If we have SeRestorePrivilege we can change the user + group to any other user.
3446   3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3447   4) If we have write permission to the file and dos_filemodes is set
3448      then allow chown to the currently authenticated user.
3449 ****************************************************************************/
3450
3451 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3452 {
3453         NTSTATUS status;
3454
3455         if(!CAN_WRITE(fsp->conn)) {
3456                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3457         }
3458
3459         /* Case (1). */
3460         status = vfs_chown_fsp(fsp, uid, gid);
3461         if (NT_STATUS_IS_OK(status)) {
3462                 return status;
3463         }
3464
3465         /* Case (2) / (3) */
3466         if (lp_enable_privileges()) {
3467                 bool has_take_ownership_priv = security_token_has_privilege(
3468                                                 get_current_nttok(fsp->conn),
3469                                                 SEC_PRIV_TAKE_OWNERSHIP);
3470                 bool has_restore_priv = security_token_has_privilege(
3471                                                 get_current_nttok(fsp->conn),
3472                                                 SEC_PRIV_RESTORE);
3473
3474                 if (has_restore_priv) {
3475                         ; /* Case (2) */
3476                 } else if (has_take_ownership_priv) {
3477                         /* Case (3) */
3478                         if (uid == get_current_uid(fsp->conn)) {
3479                                 gid = (gid_t)-1;
3480                         } else {
3481                                 has_take_ownership_priv = false;
3482                         }
3483                 }
3484
3485                 if (has_take_ownership_priv || has_restore_priv) {
3486                         become_root();
3487                         status = vfs_chown_fsp(fsp, uid, gid);
3488                         unbecome_root();
3489                         return status;
3490                 }
3491         }
3492
3493         /* Case (4). */
3494         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3495                 return NT_STATUS_ACCESS_DENIED;
3496         }
3497
3498         /* only allow chown to the current user. This is more secure,
3499            and also copes with the case where the SID in a take ownership ACL is
3500            a local SID on the users workstation
3501         */
3502         if (uid != get_current_uid(fsp->conn)) {
3503                 return NT_STATUS_ACCESS_DENIED;
3504         }
3505
3506         become_root();
3507         /* Keep the current file gid the same. */
3508         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3509         unbecome_root();
3510
3511         return status;
3512 }
3513
3514 #if 0
3515 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3516
3517 /****************************************************************************
3518  Take care of parent ACL inheritance.
3519 ****************************************************************************/
3520
3521 NTSTATUS append_parent_acl(files_struct *fsp,
3522                                 const struct security_descriptor *pcsd,
3523                                 struct security_descriptor **pp_new_sd)
3524 {
3525         struct smb_filename *smb_dname = NULL;
3526         struct security_descriptor *parent_sd = NULL;
3527         files_struct *parent_fsp = NULL;
3528         TALLOC_CTX *mem_ctx = talloc_tos();
3529         char *parent_name = NULL;
3530         struct security_ace *new_ace = NULL;
3531         unsigned int num_aces = pcsd->dacl->num_aces;
3532         NTSTATUS status;
3533         int info;
3534         unsigned int i, j;
3535         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3536         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3537
3538         if (psd == NULL) {
3539                 return NT_STATUS_NO_MEMORY;
3540         }
3541
3542         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3543                             NULL)) {
3544                 return NT_STATUS_NO_MEMORY;
3545         }
3546
3547         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3548                                             &smb_dname);
3549         if (!NT_STATUS_IS_OK(status)) {
3550                 goto fail;
3551         }
3552
3553         status = SMB_VFS_CREATE_FILE(
3554                 fsp->conn,                              /* conn */
3555                 NULL,                                   /* req */
3556                 0,                                      /* root_dir_fid */
3557                 smb_dname,                              /* fname */
3558                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3559                 FILE_SHARE_NONE,                        /* share_access */
3560                 FILE_OPEN,                              /* create_disposition*/
3561                 FILE_DIRECTORY_FILE,                    /* create_options */
3562                 0,                                      /* file_attributes */
3563                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3564                 0,                                      /* allocation_size */
3565                 NULL,                                   /* sd */
3566                 NULL,                                   /* ea_list */
3567                 &parent_fsp,                            /* result */
3568                 &info);                                 /* pinfo */
3569
3570         if (!NT_STATUS_IS_OK(status)) {
3571                 TALLOC_FREE(smb_dname);
3572                 return status;
3573         }
3574
3575         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3576                                     SECINFO_DACL, &parent_sd );
3577
3578         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3579         TALLOC_FREE(smb_dname);
3580
3581         if (!NT_STATUS_IS_OK(status)) {
3582                 return status;
3583         }
3584
3585         /*
3586          * Make room for potentially all the ACLs from
3587          * the parent. We used to add the ugw triple here,
3588          * as we knew we were dealing with POSIX ACLs.
3589          * We no longer need to do so as we can guarentee
3590          * that a default ACL from the parent directory will
3591          * be well formed for POSIX ACLs if it came from a
3592          * POSIX ACL source, and if we're not writing to a
3593          * POSIX ACL sink then we don't care if it's not well
3594          * formed. JRA.
3595          */
3596
3597         num_aces += parent_sd->dacl->num_aces;
3598
3599         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, struct security_ace,
3600                                         num_aces)) == NULL) {
3601                 return NT_STATUS_NO_MEMORY;
3602         }
3603
3604         /* Start by copying in all the given ACE entries. */
3605         for (i = 0; i < psd->dacl->num_aces; i++) {
3606                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3607         }
3608
3609         /*
3610          * Note that we're ignoring "inherit permissions" here
3611          * as that really only applies to newly created files. JRA.
3612          */
3613
3614         /* Finally append any inherited ACEs. */
3615         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3616                 struct security_ace *se = &parent_sd->dacl->aces[j];
3617
3618                 if (fsp->is_directory) {
3619                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3620                                 /* Doesn't apply to a directory - ignore. */
3621                                 DEBUG(10,("append_parent_acl: directory %s "
3622                                         "ignoring non container "
3623                                         "inherit flags %u on ACE with sid %s "
3624                                         "from parent %s\n",
3625                                         fsp_str_dbg(fsp),
3626                                         (unsigned int)se->flags,
3627                                         sid_string_dbg(&se->trustee),
3628                                         parent_name));
3629                                 continue;
3630                         }
3631                 } else {
3632                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3633                                 /* Doesn't apply to a file - ignore. */
3634                                 DEBUG(10,("append_parent_acl: file %s "
3635                                         "ignoring non object "
3636                                         "inherit flags %u on ACE with sid %s "
3637                                         "from parent %s\n",
3638                                         fsp_str_dbg(fsp),
3639                                         (unsigned int)se->flags,
3640                                         sid_string_dbg(&se->trustee),
3641                                         parent_name));
3642                                 continue;
3643                         }
3644                 }
3645
3646                 if (is_dacl_protected) {
3647                         /* If the DACL is protected it means we must
3648                          * not overwrite an existing ACE entry with the
3649                          * same SID. This is order N^2. Ouch :-(. JRA. */
3650                         unsigned int k;
3651                         for (k = 0; k < psd->dacl->num_aces; k++) {
3652                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3653                                                 &se->trustee)) {
3654                                         break;
3655                                 }
3656                         }
3657                         if (k < psd->dacl->num_aces) {
3658                                 /* SID matched. Ignore. */
3659                                 DEBUG(10,("append_parent_acl: path %s "
3660                                         "ignoring ACE with protected sid %s "
3661                                         "from parent %s\n",
3662                                         fsp_str_dbg(fsp),
3663                                         sid_string_dbg(&se->trustee),
3664                                         parent_name));
3665                                 continue;
3666                         }
3667                 }
3668
3669                 sec_ace_copy(&new_ace[i], se);
3670                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3671                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3672                 }
3673                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3674
3675                 if (fsp->is_directory) {
3676                         /*
3677                          * Strip off any inherit only. It's applied.
3678                          */
3679                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3680                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3681                                 /* No further inheritance. */
3682                                 new_ace[i].flags &=
3683                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3684                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3685                         }
3686                 } else {
3687                         /*
3688                          * Strip off any container or inherit
3689                          * flags, they can't apply to objects.
3690                          */
3691                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3692                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3693                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3694                 }
3695                 i++;
3696
3697                 DEBUG(10,("append_parent_acl: path %s "
3698                         "inheriting ACE with sid %s "
3699                         "from parent %s\n",
3700                         fsp_str_dbg(fsp),
3701                         sid_string_dbg(&se->trustee),
3702                         parent_name));
3703         }
3704
3705         psd->dacl->aces = new_ace;
3706         psd->dacl->num_aces = i;
3707         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3708                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
3709
3710         *pp_new_sd = psd;
3711         return status;
3712 }
3713 #endif
3714
3715 /****************************************************************************
3716  Reply to set a security descriptor on an fsp. security_info_sent is the
3717  description of the following NT ACL.
3718  This should be the only external function needed for the UNIX style set ACL.
3719  We make a copy of psd_orig as internal functions modify the elements inside
3720  it, even though it's a const pointer.
3721 ****************************************************************************/
3722
3723 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3724 {
3725         connection_struct *conn = fsp->conn;
3726         uid_t user = (uid_t)-1;
3727         gid_t grp = (gid_t)-1;
3728         struct dom_sid file_owner_sid;
3729         struct dom_sid file_grp_sid;
3730         canon_ace *file_ace_list = NULL;
3731         canon_ace *dir_ace_list = NULL;
3732         bool acl_perms = False;
3733         mode_t orig_mode = (mode_t)0;
3734         NTSTATUS status;
3735         bool set_acl_as_root = false;
3736         bool acl_set_support = false;
3737         bool ret = false;
3738         struct security_descriptor *psd = NULL;
3739
3740         DEBUG(10,("set_nt_acl: called for file %s\n",
3741                   fsp_str_dbg(fsp)));
3742
3743         if (!CAN_WRITE(conn)) {
3744                 DEBUG(10,("set acl rejected on read-only share\n"));
3745                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3746         }
3747
3748         if (!psd_orig) {
3749                 return NT_STATUS_INVALID_PARAMETER;
3750         }
3751
3752         psd = dup_sec_desc(talloc_tos(), psd_orig);
3753         if (!psd) {
3754                 return NT_STATUS_NO_MEMORY;
3755         }
3756
3757         /*
3758          * Get the current state of the file.
3759          */
3760
3761         status = vfs_stat_fsp(fsp);
3762         if (!NT_STATUS_IS_OK(status)) {
3763                 return status;
3764         }
3765
3766         /* Save the original element we check against. */
3767         orig_mode = fsp->fsp_name->st.st_ex_mode;
3768
3769         /*
3770          * Unpack the user/group/world id's.
3771          */
3772
3773         /* POSIX can't cope with missing owner/group. */
3774         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3775                 security_info_sent &= ~SECINFO_OWNER;
3776         }
3777         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3778                 security_info_sent &= ~SECINFO_GROUP;
3779         }
3780
3781         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3782         if (!NT_STATUS_IS_OK(status)) {
3783                 return status;
3784         }
3785
3786         /*
3787          * Do we need to chown ? If so this must be done first as the incoming
3788          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3789          * Noticed by Simo.
3790          */
3791
3792         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3793             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3794
3795                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3796                          fsp_str_dbg(fsp), (unsigned int)user,
3797                          (unsigned int)grp));
3798
3799                 status = try_chown(fsp, user, grp);
3800                 if(!NT_STATUS_IS_OK(status)) {
3801                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3802                                 "= %s.\n", fsp_str_dbg(fsp),
3803                                 (unsigned int)user,
3804                                 (unsigned int)grp,
3805                                 nt_errstr(status)));
3806                         return status;
3807                 }
3808
3809                 /*
3810                  * Recheck the current state of the file, which may have changed.
3811                  * (suid/sgid bits, for instance)
3812                  */
3813
3814                 status = vfs_stat_fsp(fsp);
3815                 if (!NT_STATUS_IS_OK(status)) {
3816                         return status;
3817                 }
3818
3819                 /* Save the original element we check against. */
3820                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3821
3822                 /* If we successfully chowned, we know we must
3823                  * be able to set the acl, so do it as root.
3824                  */
3825                 set_acl_as_root = true;
3826         }
3827
3828         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3829
3830         if((security_info_sent & SECINFO_DACL) &&
3831                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3832                         (psd->dacl == NULL)) {
3833                 struct security_ace ace[3];
3834
3835                 /* We can't have NULL DACL in POSIX.
3836                    Use owner/group/Everyone -> full access. */
3837
3838                 init_sec_ace(&ace[0],
3839                                 &file_owner_sid,
3840                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3841                                 GENERIC_ALL_ACCESS,
3842                                 0);
3843                 init_sec_ace(&ace[1],
3844                                 &file_grp_sid,
3845                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3846                                 GENERIC_ALL_ACCESS,
3847                                 0);
3848                 init_sec_ace(&ace[2],
3849                                 &global_sid_World,
3850                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3851                                 GENERIC_ALL_ACCESS,
3852                                 0);
3853                 psd->dacl = make_sec_acl(talloc_tos(),
3854                                         NT4_ACL_REVISION,
3855                                         3,
3856                                         ace);
3857                 if (psd->dacl == NULL) {
3858                         return NT_STATUS_NO_MEMORY;
3859                 }
3860                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3861         }
3862
3863         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3864                                      &file_grp_sid, &file_ace_list,
3865                                      &dir_ace_list, security_info_sent, psd);
3866
3867         /* Ignore W2K traverse DACL set. */
3868         if (!file_ace_list && !dir_ace_list) {
3869                 return NT_STATUS_OK;
3870         }
3871
3872         if (!acl_perms) {
3873                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3874                 free_canon_ace_list(file_ace_list);
3875                 free_canon_ace_list(dir_ace_list);
3876                 return NT_STATUS_ACCESS_DENIED;
3877         }
3878
3879         /*
3880          * Only change security if we got a DACL.
3881          */
3882
3883         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3884                 free_canon_ace_list(file_ace_list);
3885                 free_canon_ace_list(dir_ace_list);
3886                 return NT_STATUS_OK;
3887         }
3888
3889         /*
3890          * Try using the POSIX ACL set first. Fall back to chmod if
3891          * we have no ACL support on this filesystem.
3892          */
3893
3894         if (acl_perms && file_ace_list) {
3895                 if (set_acl_as_root) {
3896                         become_root();
3897                 }
3898                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3899                                          &fsp->fsp_name->st, &acl_set_support);
3900                 if (set_acl_as_root) {
3901                         unbecome_root();
3902                 }
3903                 if (acl_set_support && ret == false) {
3904                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3905                                  "%s (%s).\n", fsp_str_dbg(fsp),
3906                                  strerror(errno)));
3907                         free_canon_ace_list(file_ace_list);
3908                         free_canon_ace_list(dir_ace_list);
3909                         return map_nt_error_from_unix(errno);
3910                 }
3911         }
3912
3913         if (acl_perms && acl_set_support && fsp->is_directory) {
3914                 if (dir_ace_list) {
3915                         if (set_acl_as_root) {
3916                                 become_root();
3917                         }
3918                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
3919                                                  &fsp->fsp_name->st,
3920                                                  &acl_set_support);
3921                         if (set_acl_as_root) {
3922                                 unbecome_root();
3923                         }
3924                         if (ret == false) {
3925                                 DEBUG(3,("set_nt_acl: failed to set default "
3926                                          "acl on directory %s (%s).\n",
3927                                          fsp_str_dbg(fsp), strerror(errno)));
3928                                 free_canon_ace_list(file_ace_list);
3929                                 free_canon_ace_list(dir_ace_list);
3930                                 return map_nt_error_from_unix(errno);
3931                         }
3932                 } else {
3933                         int sret = -1;
3934
3935                         /*
3936                          * No default ACL - delete one if it exists.
3937                          */
3938
3939                         if (set_acl_as_root) {
3940                                 become_root();
3941                         }
3942                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3943                             fsp->fsp_name->base_name);
3944                         if (set_acl_as_root) {
3945                                 unbecome_root();
3946                         }
3947                         if (sret == -1) {
3948                                 if (acl_group_override(conn, fsp->fsp_name)) {
3949                                         DEBUG(5,("set_nt_acl: acl group "
3950                                                  "control on and current user "
3951                                                  "in file %s primary group. "
3952                                                  "Override delete_def_acl\n",
3953                                                  fsp_str_dbg(fsp)));
3954
3955                                         become_root();
3956                                         sret =
3957                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3958                                                     conn,
3959                                                     fsp->fsp_name->base_name);
3960                                         unbecome_root();
3961                                 }
3962
3963                                 if (sret == -1) {
3964                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3965                                         free_canon_ace_list(file_ace_list);
3966                                         free_canon_ace_list(dir_ace_list);
3967                                         return map_nt_error_from_unix(errno);
3968                                 }
3969                         }
3970                 }
3971         }
3972
3973         if (acl_set_support) {
3974                 if (set_acl_as_root) {
3975                         become_root();
3976                 }
3977                 store_inheritance_attributes(fsp,
3978                                 file_ace_list,
3979                                 dir_ace_list,
3980                                 psd->type);
3981                 if (set_acl_as_root) {
3982                         unbecome_root();
3983                 }
3984         }
3985
3986         /*
3987          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3988          */
3989
3990         if(!acl_set_support && acl_perms) {
3991                 mode_t posix_perms;
3992
3993                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3994                         free_canon_ace_list(file_ace_list);
3995                         free_canon_ace_list(dir_ace_list);
3996                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
3997                                  "posix permissions for file %s.\n",
3998                                  fsp_str_dbg(fsp)));
3999                         return NT_STATUS_ACCESS_DENIED;
4000                 }
4001
4002                 if (orig_mode != posix_perms) {
4003                         int sret = -1;
4004
4005                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4006                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4007
4008                         if (set_acl_as_root) {
4009                                 become_root();
4010                         }
4011                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4012                                              posix_perms);
4013                         if (set_acl_as_root) {
4014                                 unbecome_root();
4015                         }
4016                         if(sret == -1) {
4017                                 if (acl_group_override(conn, fsp->fsp_name)) {
4018                                         DEBUG(5,("set_nt_acl: acl group "
4019                                                  "control on and current user "
4020                                                  "in file %s primary group. "
4021                                                  "Override chmod\n",
4022                                                  fsp_str_dbg(fsp)));
4023
4024                                         become_root();
4025                                         sret = SMB_VFS_CHMOD(conn,
4026                                             fsp->fsp_name->base_name,
4027                                             posix_perms);
4028                                         unbecome_root();
4029                                 }
4030
4031                                 if (sret == -1) {
4032                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4033                                                  "failed. Error = %s.\n",
4034                                                  fsp_str_dbg(fsp),
4035                                                  (unsigned int)posix_perms,
4036                                                  strerror(errno)));
4037                                         free_canon_ace_list(file_ace_list);
4038                                         free_canon_ace_list(dir_ace_list);
4039                                         return map_nt_error_from_unix(errno);
4040                                 }
4041                         }
4042                 }
4043         }
4044
4045         free_canon_ace_list(file_ace_list);
4046         free_canon_ace_list(dir_ace_list);
4047
4048         /* Ensure the stat struct in the fsp is correct. */
4049         status = vfs_stat_fsp(fsp);
4050
4051         return NT_STATUS_OK;
4052 }
4053
4054 /****************************************************************************
4055  Get the actual group bits stored on a file with an ACL. Has no effect if
4056  the file has no ACL. Needed in dosmode code where the stat() will return
4057  the mask bits, not the real group bits, for a file with an ACL.
4058 ****************************************************************************/
4059
4060 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4061 {
4062         int entry_id = SMB_ACL_FIRST_ENTRY;
4063         SMB_ACL_ENTRY_T entry;
4064         SMB_ACL_T posix_acl;
4065         int result = -1;
4066
4067         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4068         if (posix_acl == (SMB_ACL_T)NULL)
4069                 return -1;
4070
4071         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4072                 SMB_ACL_TAG_T tagtype;
4073                 SMB_ACL_PERMSET_T permset;
4074
4075                 entry_id = SMB_ACL_NEXT_ENTRY;
4076
4077                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4078                         break;
4079
4080                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4081                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4082                                 break;
4083                         } else {
4084                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4085                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4086                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4087                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4088                                 result = 0;
4089                                 break;
4090                         }
4091                 }
4092         }
4093         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4094         return result;
4095 }
4096
4097 /****************************************************************************
4098  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4099  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4100 ****************************************************************************/
4101
4102 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4103 {
4104         int entry_id = SMB_ACL_FIRST_ENTRY;
4105         SMB_ACL_ENTRY_T entry;
4106         int num_entries = 0;
4107
4108         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4109                 SMB_ACL_TAG_T tagtype;
4110                 SMB_ACL_PERMSET_T permset;
4111                 mode_t perms;
4112
4113                 entry_id = SMB_ACL_NEXT_ENTRY;
4114
4115                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4116                         return -1;
4117
4118                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4119                         return -1;
4120
4121                 num_entries++;
4122
4123                 switch(tagtype) {
4124                         case SMB_ACL_USER_OBJ:
4125                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4126                                 break;
4127                         case SMB_ACL_GROUP_OBJ:
4128                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4129                                 break;
4130                         case SMB_ACL_MASK:
4131                                 /*
4132                                  * FIXME: The ACL_MASK entry permissions should really be set to
4133                                  * the union of the permissions of all ACL_USER,
4134                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4135                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4136                                  */
4137                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4138                                 break;
4139                         case SMB_ACL_OTHER:
4140                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4141                                 break;
4142                         default:
4143                                 continue;
4144                 }
4145
4146                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4147                         return -1;
4148
4149                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4150                         return -1;
4151         }
4152
4153         /*
4154          * If this is a simple 3 element ACL or no elements then it's a standard
4155          * UNIX permission set. Just use chmod...
4156          */
4157
4158         if ((num_entries == 3) || (num_entries == 0))
4159                 return -1;
4160
4161         return 0;
4162 }
4163
4164 /****************************************************************************
4165  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4166  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4167  resulting ACL on TO.  Note that name is in UNIX character set.
4168 ****************************************************************************/
4169
4170 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4171 {
4172         SMB_ACL_T posix_acl = NULL;
4173         int ret = -1;
4174
4175         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4176                 return -1;
4177
4178         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4179                 goto done;
4180
4181         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4182
4183  done:
4184
4185         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4186         return ret;
4187 }
4188
4189 /****************************************************************************
4190  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4191  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4192  Note that name is in UNIX character set.
4193 ****************************************************************************/
4194
4195 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4196 {
4197         return copy_access_posix_acl(conn, name, name, mode);
4198 }
4199
4200 /****************************************************************************
4201  Check for an existing default POSIX ACL on a directory.
4202 ****************************************************************************/
4203
4204 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4205 {
4206         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4207         bool has_acl = False;
4208         SMB_ACL_ENTRY_T entry;
4209
4210         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4211                 has_acl = True;
4212         }
4213
4214         if (def_acl) {
4215                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4216         }
4217         return has_acl;
4218 }
4219
4220 /****************************************************************************
4221  If the parent directory has no default ACL but it does have an Access ACL,
4222  inherit this Access ACL to file name.
4223 ****************************************************************************/
4224
4225 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4226                        const char *name, mode_t mode)
4227 {
4228         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4229                 return 0;
4230
4231         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4232 }
4233
4234 /****************************************************************************
4235  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4236  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4237 ****************************************************************************/
4238
4239 int fchmod_acl(files_struct *fsp, mode_t mode)
4240 {
4241         connection_struct *conn = fsp->conn;
4242         SMB_ACL_T posix_acl = NULL;
4243         int ret = -1;
4244
4245         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4246                 return -1;
4247
4248         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4249                 goto done;
4250
4251         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4252
4253   done:
4254
4255         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4256         return ret;
4257 }
4258
4259 /****************************************************************************
4260  Map from wire type to permset.
4261 ****************************************************************************/
4262
4263 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4264 {
4265         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4266                 return False;
4267         }
4268
4269         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4270                 return False;
4271         }
4272
4273         if (wire_perm & SMB_POSIX_ACL_READ) {
4274                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4275                         return False;
4276                 }
4277         }
4278         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4279                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4280                         return False;
4281                 }
4282         }
4283         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4284                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4285                         return False;
4286                 }
4287         }
4288         return True;
4289 }
4290
4291 /****************************************************************************
4292  Map from wire type to tagtype.
4293 ****************************************************************************/
4294
4295 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4296 {
4297         switch (wire_tt) {
4298                 case SMB_POSIX_ACL_USER_OBJ:
4299                         *p_tt = SMB_ACL_USER_OBJ;
4300                         break;
4301                 case SMB_POSIX_ACL_USER:
4302                         *p_tt = SMB_ACL_USER;
4303                         break;
4304                 case SMB_POSIX_ACL_GROUP_OBJ:
4305                         *p_tt = SMB_ACL_GROUP_OBJ;
4306                         break;
4307                 case SMB_POSIX_ACL_GROUP:
4308                         *p_tt = SMB_ACL_GROUP;
4309                         break;
4310                 case SMB_POSIX_ACL_MASK:
4311                         *p_tt = SMB_ACL_MASK;
4312                         break;
4313                 case SMB_POSIX_ACL_OTHER:
4314                         *p_tt = SMB_ACL_OTHER;
4315                         break;
4316                 default:
4317                         return False;
4318         }
4319         return True;
4320 }
4321
4322 /****************************************************************************
4323  Create a new POSIX acl from wire permissions.
4324  FIXME ! How does the share mask/mode fit into this.... ?
4325 ****************************************************************************/
4326
4327 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4328 {
4329         unsigned int i;
4330         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4331
4332         if (the_acl == NULL) {
4333                 return NULL;
4334         }
4335
4336         for (i = 0; i < num_acls; i++) {
4337                 SMB_ACL_ENTRY_T the_entry;
4338                 SMB_ACL_PERMSET_T the_permset;
4339                 SMB_ACL_TAG_T tag_type;
4340
4341                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4342                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4343                                 i, strerror(errno) ));
4344                         goto fail;
4345                 }
4346
4347                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4348                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4349                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4350                         goto fail;
4351                 }
4352
4353                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4354                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4355                                 i, strerror(errno) ));
4356                         goto fail;
4357                 }
4358
4359                 /* Get the permset pointer from the new ACL entry. */
4360                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4361                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4362                                 i, strerror(errno) ));
4363                         goto fail;
4364                 }
4365
4366                 /* Map from wire to permissions. */
4367                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4368                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4369                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4370                         goto fail;
4371                 }
4372
4373                 /* Now apply to the new ACL entry. */
4374                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4375                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4376                                 i, strerror(errno) ));
4377                         goto fail;
4378                 }
4379
4380                 if (tag_type == SMB_ACL_USER) {
4381                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4382                         uid_t uid = (uid_t)uidval;
4383                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4384                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4385                                         (unsigned int)uid, i, strerror(errno) ));
4386                                 goto fail;
4387                         }
4388                 }
4389
4390                 if (tag_type == SMB_ACL_GROUP) {
4391                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4392                         gid_t gid = (uid_t)gidval;
4393                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4394                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4395                                         (unsigned int)gid, i, strerror(errno) ));
4396                                 goto fail;
4397                         }
4398                 }
4399         }
4400
4401         return the_acl;
4402
4403  fail:
4404
4405         if (the_acl != NULL) {
4406                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4407         }
4408         return NULL;
4409 }
4410
4411 /****************************************************************************
4412  Calls from UNIX extensions - Default POSIX ACL set.
4413  If num_def_acls == 0 and not a directory just return. If it is a directory
4414  and num_def_acls == 0 then remove the default acl. Else set the default acl
4415  on the directory.
4416 ****************************************************************************/
4417
4418 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4419                                 uint16 num_def_acls, const char *pdata)
4420 {
4421         SMB_ACL_T def_acl = NULL;
4422
4423         if (!S_ISDIR(psbuf->st_ex_mode)) {
4424                 if (num_def_acls) {
4425                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4426                         errno = EISDIR;
4427                         return False;
4428                 } else {
4429                         return True;
4430                 }
4431         }
4432
4433         if (!num_def_acls) {
4434                 /* Remove the default ACL. */
4435                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4436                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4437                                 fname, strerror(errno) ));
4438                         return False;
4439                 }
4440                 return True;
4441         }
4442
4443         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4444                 return False;
4445         }
4446
4447         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4448                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4449                         fname, strerror(errno) ));
4450                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4451                 return False;
4452         }
4453
4454         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4455         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4456         return True;
4457 }
4458
4459 /****************************************************************************
4460  Remove an ACL from a file. As we don't have acl_delete_entry() available
4461  we must read the current acl and copy all entries except MASK, USER and GROUP
4462  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4463  removed.
4464  FIXME ! How does the share mask/mode fit into this.... ?
4465 ****************************************************************************/
4466
4467 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4468 {
4469         SMB_ACL_T file_acl = NULL;
4470         int entry_id = SMB_ACL_FIRST_ENTRY;
4471         SMB_ACL_ENTRY_T entry;
4472         bool ret = False;
4473         /* Create a new ACL with only 3 entries, u/g/w. */
4474         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4475         SMB_ACL_ENTRY_T user_ent = NULL;
4476         SMB_ACL_ENTRY_T group_ent = NULL;
4477         SMB_ACL_ENTRY_T other_ent = NULL;
4478
4479         if (new_file_acl == NULL) {
4480                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4481                 return False;
4482         }
4483
4484         /* Now create the u/g/w entries. */
4485         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4486                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4487                         fname, strerror(errno) ));
4488                 goto done;
4489         }
4490         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4491                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4492                         fname, strerror(errno) ));
4493                 goto done;
4494         }
4495
4496         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4497                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4498                         fname, strerror(errno) ));
4499                 goto done;
4500         }
4501         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4502                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4503                         fname, strerror(errno) ));
4504                 goto done;
4505         }
4506
4507         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4508                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4509                         fname, strerror(errno) ));
4510                 goto done;
4511         }
4512         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4513                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4514                         fname, strerror(errno) ));
4515                 goto done;
4516         }
4517
4518         /* Get the current file ACL. */
4519         if (fsp && fsp->fh->fd != -1) {
4520                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4521         } else {
4522                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4523         }
4524
4525         if (file_acl == NULL) {
4526                 /* This is only returned if an error occurred. Even for a file with
4527                    no acl a u/g/w acl should be returned. */
4528                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4529                         fname, strerror(errno) ));
4530                 goto done;
4531         }
4532
4533         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4534                 SMB_ACL_TAG_T tagtype;
4535                 SMB_ACL_PERMSET_T permset;
4536
4537                 entry_id = SMB_ACL_NEXT_ENTRY;
4538
4539                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4540                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4541                                 fname, strerror(errno) ));
4542                         goto done;
4543                 }
4544
4545                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4546                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4547                                 fname, strerror(errno) ));
4548                         goto done;
4549                 }
4550
4551                 if (tagtype == SMB_ACL_USER_OBJ) {
4552                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4553                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4554                                         fname, strerror(errno) ));
4555                         }
4556                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4557                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4558                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4559                                         fname, strerror(errno) ));
4560                         }
4561                 } else if (tagtype == SMB_ACL_OTHER) {
4562                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4563                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4564                                         fname, strerror(errno) ));
4565                         }
4566                 }
4567         }
4568
4569         /* Set the new empty file ACL. */
4570         if (fsp && fsp->fh->fd != -1) {
4571                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4572                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4573                                 fname, strerror(errno) ));
4574                         goto done;
4575                 }
4576         } else {
4577                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4578                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4579                                 fname, strerror(errno) ));
4580                         goto done;
4581                 }
4582         }
4583
4584         ret = True;
4585
4586  done:
4587
4588         if (file_acl) {
4589                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4590         }
4591         if (new_file_acl) {
4592                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4593         }
4594         return ret;
4595 }
4596
4597 /****************************************************************************
4598  Calls from UNIX extensions - POSIX ACL set.
4599  If num_def_acls == 0 then read/modify/write acl after removing all entries
4600  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4601 ****************************************************************************/
4602
4603 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4604 {
4605         SMB_ACL_T file_acl = NULL;
4606
4607         if (!num_acls) {
4608                 /* Remove the ACL from the file. */
4609                 return remove_posix_acl(conn, fsp, fname);
4610         }
4611
4612         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4613                 return False;
4614         }
4615
4616         if (fsp && fsp->fh->fd != -1) {
4617                 /* The preferred way - use an open fd. */
4618                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4619                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4620                                 fname, strerror(errno) ));
4621                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4622                         return False;
4623                 }
4624         } else {
4625                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4626                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4627                                 fname, strerror(errno) ));
4628                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4629                         return False;
4630                 }
4631         }
4632
4633         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4634         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4635         return True;
4636 }
4637
4638 /********************************************************************
4639  Pull the NT ACL from a file on disk or the OpenEventlog() access
4640  check.  Caller is responsible for freeing the returned security
4641  descriptor via TALLOC_FREE().  This is designed for dealing with
4642  user space access checks in smbd outside of the VFS.  For example,
4643  checking access rights in OpenEventlog().
4644
4645  Assume we are dealing with files (for now)
4646 ********************************************************************/
4647
4648 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4649 {
4650         struct security_descriptor *psd, *ret_sd;
4651         connection_struct *conn;
4652         files_struct finfo;
4653         struct fd_handle fh;
4654         NTSTATUS status;
4655
4656         conn = TALLOC_ZERO_P(ctx, connection_struct);
4657         if (conn == NULL) {
4658                 DEBUG(0, ("talloc failed\n"));
4659                 return NULL;
4660         }
4661
4662         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4663                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4664                 TALLOC_FREE(conn);
4665                 return NULL;
4666         }
4667
4668         conn->params->service = -1;
4669
4670         set_conn_connectpath(conn, "/");
4671
4672         if (!smbd_vfs_init(conn)) {
4673                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4674                 conn_free(conn);
4675                 return NULL;
4676         }
4677
4678         ZERO_STRUCT( finfo );
4679         ZERO_STRUCT( fh );
4680
4681         finfo.fnum = -1;
4682         finfo.conn = conn;
4683         finfo.fh = &fh;
4684         finfo.fh->fd = -1;
4685
4686         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4687                                             &finfo.fsp_name);
4688         if (!NT_STATUS_IS_OK(status)) {
4689                 conn_free(conn);
4690                 return NULL;
4691         }
4692
4693         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4694                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4695                 TALLOC_FREE(finfo.fsp_name);
4696                 conn_free(conn);
4697                 return NULL;
4698         }
4699
4700         ret_sd = dup_sec_desc( ctx, psd );
4701
4702         TALLOC_FREE(finfo.fsp_name);
4703         conn_free(conn);
4704
4705         return ret_sd;
4706 }
4707
4708 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4709
4710 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4711                                         const char *name,
4712                                         SMB_STRUCT_STAT *psbuf,
4713                                         struct security_descriptor **ppdesc)
4714 {
4715         struct dom_sid owner_sid, group_sid;
4716         size_t size = 0;
4717         struct security_ace aces[4];
4718         uint32_t access_mask = 0;
4719         mode_t mode = psbuf->st_ex_mode;
4720         struct security_acl *new_dacl = NULL;
4721         int idx = 0;
4722
4723         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4724                 name, (int)mode ));
4725
4726         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4727         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4728
4729         /*
4730          We provide up to 4 ACEs
4731                 - Owner
4732                 - Group
4733                 - Everyone
4734                 - NT System
4735         */
4736
4737         if (mode & S_IRUSR) {
4738                 if (mode & S_IWUSR) {
4739                         access_mask |= SEC_RIGHTS_FILE_ALL;
4740                 } else {
4741                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4742                 }
4743         }
4744         if (mode & S_IWUSR) {
4745                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4746         }
4747
4748         init_sec_ace(&aces[idx],
4749                         &owner_sid,
4750                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4751                         access_mask,
4752                         0);
4753         idx++;
4754
4755         access_mask = 0;
4756         if (mode & S_IRGRP) {
4757                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4758         }
4759         if (mode & S_IWGRP) {
4760                 /* note that delete is not granted - this matches posix behaviour */
4761                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4762         }
4763         if (access_mask) {
4764                 init_sec_ace(&aces[idx],
4765                         &group_sid,
4766                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4767                         access_mask,
4768                         0);
4769                 idx++;
4770         }
4771
4772         access_mask = 0;
4773         if (mode & S_IROTH) {
4774                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4775         }
4776         if (mode & S_IWOTH) {
4777                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4778         }
4779         if (access_mask) {
4780                 init_sec_ace(&aces[idx],
4781                         &global_sid_World,
4782                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4783                         access_mask,
4784                         0);
4785                 idx++;
4786         }
4787
4788         init_sec_ace(&aces[idx],
4789                         &global_sid_System,
4790                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4791                         SEC_RIGHTS_FILE_ALL,
4792                         0);
4793         idx++;
4794
4795         new_dacl = make_sec_acl(ctx,
4796                         NT4_ACL_REVISION,
4797                         idx,
4798                         aces);
4799
4800         if (!new_dacl) {
4801                 return NT_STATUS_NO_MEMORY;
4802         }
4803
4804         *ppdesc = make_sec_desc(ctx,
4805                         SECURITY_DESCRIPTOR_REVISION_1,
4806                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4807                         &owner_sid,
4808                         &group_sid,
4809                         NULL,
4810                         new_dacl,
4811                         &size);
4812         if (!*ppdesc) {
4813                 return NT_STATUS_NO_MEMORY;
4814         }
4815         return NT_STATUS_OK;
4816 }