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 "../libcli/security/security.h"
  24
  25 extern const struct generic_mapping file_generic_mapping;
  26
  27 #undef  DBGC_CLASS
  28 #define DBGC_CLASS DBGC_ACLS
  29
  30 /****************************************************************************
  31  Data structures representing the internal ACE format.
  32 ****************************************************************************/
  33
  34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  36
  37 typedef union posix_id {
  38                 uid_t uid;
  39                 gid_t gid;
  40                 int world;
  41 } posix_id;
  42
  43 typedef struct canon_ace {
  44         struct canon_ace *next, *prev;
  45         SMB_ACL_TAG_T type;
  46         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  47         struct dom_sid trustee;
  48         enum ace_owner owner_type;
  49         enum ace_attribute attr;
  50         posix_id unix_ug;
  51         uint8_t ace_flags; /* From windows ACE entry. */
  52 } canon_ace;
  53
  54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  55
  56 /*
  57  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  58  * attribute on disk - version 1.
  59  * All values are little endian.
  60  *
  61  * |  1   |  1   |   2         |         2           |  ....
  62  * +------+------+-------------+---------------------+-------------+--------------------+
  63  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  64  * +------+------+-------------+---------------------+-------------+--------------------+
  65  *
  66  * Entry format is :
  67  *
  68  * |  1   |       4           |
  69  * +------+-------------------+
  70  * | value|  uid/gid or world |
  71  * | type |  value            |
  72  * +------+-------------------+
  73  *
  74  * Version 2 format. Stores extra Windows metadata about an ACL.
  75  *
  76  * |  1   |  2       |   2         |         2           |  ....
  77  * +------+----------+-------------+---------------------+-------------+--------------------+
  78  * | vers | ace      | num_entries | num_default_entries | ..entries.. | default_entries... |
  79  * |   2  |  type    |             |                     |             |                    |
  80  * +------+----------+-------------+---------------------+-------------+--------------------+
  81  *
  82  * Entry format is :
  83  *
  84  * |  1   |  1   |       4           |
  85  * +------+------+-------------------+
  86  * | ace  | value|  uid/gid or world |
  87  * | flag | type |  value            |
  88  * +------+-------------------+------+
  89  *
  90  */
  91
  92 #define PAI_VERSION_OFFSET                      0
  93
  94 #define PAI_V1_FLAG_OFFSET                      1
  95 #define PAI_V1_NUM_ENTRIES_OFFSET               2
  96 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET       4
  97 #define PAI_V1_ENTRIES_BASE                     6
  98 #define PAI_V1_ACL_FLAG_PROTECTED               0x1
  99 #define PAI_V1_ENTRY_LENGTH                     5
 100
 101 #define PAI_V1_VERSION                          1
 102
 103 #define PAI_V2_TYPE_OFFSET                      1
 104 #define PAI_V2_NUM_ENTRIES_OFFSET               3
 105 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET       5
 106 #define PAI_V2_ENTRIES_BASE                     7
 107 #define PAI_V2_ENTRY_LENGTH                     6
 108
 109 #define PAI_V2_VERSION                          2
 110
 111 /*
 112  * In memory format of user.SAMBA_PAI attribute.
 113  */
 114
 115 struct pai_entry {
 116         struct pai_entry *next, *prev;
 117         uint8_t ace_flags;
 118         enum ace_owner owner_type;
 119         posix_id unix_ug;
 120 };
 121
 122 struct pai_val {
 123         uint16_t sd_type;
 124         unsigned int num_entries;
 125         struct pai_entry *entry_list;
 126         unsigned int num_def_entries;
 127         struct pai_entry *def_entry_list;
 128 };
 129
 130 /************************************************************************
 131  Return a uint32 of the pai_entry principal.
 132 ************************************************************************/
 133
 134 static uint32_t get_pai_entry_val(struct pai_entry *paie)
 135 {
 136         switch (paie->owner_type) {
 137                 case UID_ACE:
 138                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 139                         return (uint32_t)paie->unix_ug.uid;
 140                 case GID_ACE:
 141                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 142                         return (uint32_t)paie->unix_ug.gid;
 143                 case WORLD_ACE:
 144                 default:
 145                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 146                         return (uint32_t)-1;
 147         }
 148 }
 149
 150 /************************************************************************
 151  Return a uint32 of the entry principal.
 152 ************************************************************************/
 153
 154 static uint32_t get_entry_val(canon_ace *ace_entry)
 155 {
 156         switch (ace_entry->owner_type) {
 157                 case UID_ACE:
 158                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
 159                         return (uint32_t)ace_entry->unix_ug.uid;
 160                 case GID_ACE:
 161                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
 162                         return (uint32_t)ace_entry->unix_ug.gid;
 163                 case WORLD_ACE:
 164                 default:
 165                         DEBUG(10,("get_entry_val: world ace\n"));
 166                         return (uint32_t)-1;
 167         }
 168 }
 169
 170 /************************************************************************
 171  Create the on-disk format (always v2 now). Caller must free.
 172 ************************************************************************/
 173
 174 static char *create_pai_buf_v2(canon_ace *file_ace_list,
 175                                 canon_ace *dir_ace_list,
 176                                 uint16_t sd_type,
 177                                 size_t *store_size)
 178 {
 179         char *pai_buf = NULL;
 180         canon_ace *ace_list = NULL;
 181         char *entry_offset = NULL;
 182         unsigned int num_entries = 0;
 183         unsigned int num_def_entries = 0;
 184         unsigned int i;
 185
 186         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 187                 num_entries++;
 188         }
 189
 190         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 191                 num_def_entries++;
 192         }
 193
 194         DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 195
 196         *store_size = PAI_V2_ENTRIES_BASE +
 197                 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
 198
 199         pai_buf = (char *)SMB_MALLOC(*store_size);
 200         if (!pai_buf) {
 201                 return NULL;
 202         }
 203
 204         /* Set up the header. */
 205         memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
 206         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
 207         SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
 208         SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
 209         SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 210
 211         DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
 212                         (unsigned int)sd_type ));
 213
 214         entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
 215
 216         i = 0;
 217         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 218                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 219                 uint32_t entry_val = get_entry_val(ace_list);
 220
 221                 SCVAL(entry_offset,0,ace_list->ace_flags);
 222                 SCVAL(entry_offset,1,type_val);
 223                 SIVAL(entry_offset,2,entry_val);
 224                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 225                         i,
 226                         (unsigned int)ace_list->ace_flags,
 227                         (unsigned int)type_val,
 228                         (unsigned int)entry_val ));
 229                 i++;
 230                 entry_offset += PAI_V2_ENTRY_LENGTH;
 231         }
 232
 233         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 234                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 235                 uint32_t entry_val = get_entry_val(ace_list);
 236
 237                 SCVAL(entry_offset,0,ace_list->ace_flags);
 238                 SCVAL(entry_offset,1,type_val);
 239                 SIVAL(entry_offset,2,entry_val);
 240                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 241                         i,
 242                         (unsigned int)ace_list->ace_flags,
 243                         (unsigned int)type_val,
 244                         (unsigned int)entry_val ));
 245                 i++;
 246                 entry_offset += PAI_V2_ENTRY_LENGTH;
 247         }
 248
 249         return pai_buf;
 250 }
 251
 252 /************************************************************************
 253  Store the user.SAMBA_PAI attribute on disk.
 254 ************************************************************************/
 255
 256 static void store_inheritance_attributes(files_struct *fsp,
 257                                         canon_ace *file_ace_list,
 258                                         canon_ace *dir_ace_list,
 259                                         uint16_t sd_type)
 260 {
 261         int ret;
 262         size_t store_size;
 263         char *pai_buf;
 264
 265         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 266                 return;
 267         }
 268
 269         pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
 270                                 sd_type, &store_size);
 271
 272         if (fsp->fh->fd != -1) {
 273                 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 274                                 pai_buf, store_size, 0);
 275         } else {
 276                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
 277                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 278                                        pai_buf, store_size, 0);
 279         }
 280
 281         SAFE_FREE(pai_buf);
 282
 283         DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
 284                 (unsigned int)sd_type,
 285                 fsp_str_dbg(fsp)));
 286
 287         if (ret == -1 && !no_acl_syscall_error(errno)) {
 288                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 289         }
 290 }
 291
 292 /************************************************************************
 293  Delete the in memory inheritance info.
 294 ************************************************************************/
 295
 296 static void free_inherited_info(struct pai_val *pal)
 297 {
 298         if (pal) {
 299                 struct pai_entry *paie, *paie_next;
 300                 for (paie = pal->entry_list; paie; paie = paie_next) {
 301                         paie_next = paie->next;
 302                         SAFE_FREE(paie);
 303                 }
 304                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 305                         paie_next = paie->next;
 306                         SAFE_FREE(paie);
 307                 }
 308                 SAFE_FREE(pal);
 309         }
 310 }
 311
 312 /************************************************************************
 313  Get any stored ACE flags.
 314 ************************************************************************/
 315
 316 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
 317 {
 318         struct pai_entry *paie;
 319
 320         if (!pal) {
 321                 return 0;
 322         }
 323
 324         /* If the entry exists it is inherited. */
 325         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 326                 if (ace_entry->owner_type == paie->owner_type &&
 327                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 328                         return paie->ace_flags;
 329         }
 330         return 0;
 331 }
 332
 333 /************************************************************************
 334  Ensure an attribute just read is valid - v1.
 335 ************************************************************************/
 336
 337 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
 338 {
 339         uint16 num_entries;
 340         uint16 num_def_entries;
 341
 342         if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
 343                 /* Corrupted - too small. */
 344                 return false;
 345         }
 346
 347         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
 348                 return false;
 349         }
 350
 351         num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
 352         num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 353
 354         /* Check the entry lists match. */
 355         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 356
 357         if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
 358                         PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
 359                 return false;
 360         }
 361
 362         return true;
 363 }
 364
 365 /************************************************************************
 366  Ensure an attribute just read is valid - v2.
 367 ************************************************************************/
 368
 369 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
 370 {
 371         uint16 num_entries;
 372         uint16 num_def_entries;
 373
 374         if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
 375                 /* Corrupted - too small. */
 376                 return false;
 377         }
 378
 379         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
 380                 return false;
 381         }
 382
 383         num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
 384         num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 385
 386         /* Check the entry lists match. */
 387         /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
 388
 389         if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
 390                         PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
 391                 return false;
 392         }
 393
 394         return true;
 395 }
 396
 397 /************************************************************************
 398  Decode the owner.
 399 ************************************************************************/
 400
 401 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
 402 {
 403         paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 404         switch( paie->owner_type) {
 405                 case UID_ACE:
 406                         paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 407                         DEBUG(10,("get_pai_owner_type: uid = %u\n",
 408                                 (unsigned int)paie->unix_ug.uid ));
 409                         break;
 410                 case GID_ACE:
 411                         paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 412                         DEBUG(10,("get_pai_owner_type: gid = %u\n",
 413                                 (unsigned int)paie->unix_ug.gid ));
 414                         break;
 415                 case WORLD_ACE:
 416                         paie->unix_ug.world = -1;
 417                         DEBUG(10,("get_pai_owner_type: world ace\n"));
 418                         break;
 419                 default:
 420                         DEBUG(10,("get_pai_owner_type: unknown type %u\n",
 421                                 (unsigned int)paie->owner_type ));
 422                         return false;
 423         }
 424         return true;
 425 }
 426
 427 /************************************************************************
 428  Process v2 entries.
 429 ************************************************************************/
 430
 431 static const char *create_pai_v1_entries(struct pai_val *paiv,
 432                                 const char *entry_offset,
 433                                 bool def_entry)
 434 {
 435         int i;
 436
 437         for (i = 0; i < paiv->num_entries; i++) {
 438                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 439                 if (!paie) {
 440                         return NULL;
 441                 }
 442
 443                 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
 444                 if (!get_pai_owner_type(paie, entry_offset)) {
 445                         SAFE_FREE(paie);
 446                         return NULL;
 447                 }
 448
 449                 if (!def_entry) {
 450                         DLIST_ADD(paiv->entry_list, paie);
 451                 } else {
 452                         DLIST_ADD(paiv->def_entry_list, paie);
 453                 }
 454                 entry_offset += PAI_V1_ENTRY_LENGTH;
 455         }
 456         return entry_offset;
 457 }
 458
 459 /************************************************************************
 460  Convert to in-memory format from version 1.
 461 ************************************************************************/
 462
 463 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
 464 {
 465         const char *entry_offset;
 466         struct pai_val *paiv = NULL;
 467
 468         if (!check_pai_ok_v1(buf, size)) {
 469                 return NULL;
 470         }
 471
 472         paiv = SMB_MALLOC_P(struct pai_val);
 473         if (!paiv) {
 474                 return NULL;
 475         }
 476
 477         memset(paiv, '\0', sizeof(struct pai_val));
 478
 479         paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
 480                         SEC_DESC_DACL_PROTECTED : 0;
 481
 482         paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
 483         paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 484
 485         entry_offset = buf + PAI_V1_ENTRIES_BASE;
 486
 487         DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
 488                         paiv->num_entries, paiv->num_def_entries ));
 489
 490         entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
 491         if (entry_offset == NULL) {
 492                 free_inherited_info(paiv);
 493                 return NULL;
 494         }
 495         entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
 496         if (entry_offset == NULL) {
 497                 free_inherited_info(paiv);
 498                 return NULL;
 499         }
 500
 501         return paiv;
 502 }
 503
 504 /************************************************************************
 505  Process v2 entries.
 506 ************************************************************************/
 507
 508 static const char *create_pai_v2_entries(struct pai_val *paiv,
 509                                 unsigned int num_entries,
 510                                 const char *entry_offset,
 511                                 bool def_entry)
 512 {
 513         unsigned int i;
 514
 515         for (i = 0; i < num_entries; i++) {
 516                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 517                 if (!paie) {
 518                         return NULL;
 519                 }
 520
 521                 paie->ace_flags = CVAL(entry_offset,0);
 522
 523                 if (!get_pai_owner_type(paie, entry_offset+1)) {
 524                         SAFE_FREE(paie);
 525                         return NULL;
 526                 }
 527                 if (!def_entry) {
 528                         DLIST_ADD(paiv->entry_list, paie);
 529                 } else {
 530                         DLIST_ADD(paiv->def_entry_list, paie);
 531                 }
 532                 entry_offset += PAI_V2_ENTRY_LENGTH;
 533         }
 534         return entry_offset;
 535 }
 536
 537 /************************************************************************
 538  Convert to in-memory format from version 2.
 539 ************************************************************************/
 540
 541 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
 542 {
 543         const char *entry_offset;
 544         struct pai_val *paiv = NULL;
 545
 546         if (!check_pai_ok_v2(buf, size)) {
 547                 return NULL;
 548         }
 549
 550         paiv = SMB_MALLOC_P(struct pai_val);
 551         if (!paiv) {
 552                 return NULL;
 553         }
 554
 555         memset(paiv, '\0', sizeof(struct pai_val));
 556
 557         paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
 558
 559         paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
 560         paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 561
 562         entry_offset = buf + PAI_V2_ENTRIES_BASE;
 563
 564         DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
 565                         (unsigned int)paiv->sd_type,
 566                         paiv->num_entries, paiv->num_def_entries ));
 567
 568         entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
 569                                 entry_offset, false);
 570         if (entry_offset == NULL) {
 571                 free_inherited_info(paiv);
 572                 return NULL;
 573         }
 574         entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
 575                                 entry_offset, true);
 576         if (entry_offset == NULL) {
 577                 free_inherited_info(paiv);
 578                 return NULL;
 579         }
 580
 581         return paiv;
 582 }
 583
 584 /************************************************************************
 585  Convert to in-memory format - from either version 1 or 2.
 586 ************************************************************************/
 587
 588 static struct pai_val *create_pai_val(const char *buf, size_t size)
 589 {
 590         if (size < 1) {
 591                 return NULL;
 592         }
 593         if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
 594                 return create_pai_val_v1(buf, size);
 595         } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
 596                 return create_pai_val_v2(buf, size);
 597         } else {
 598                 return NULL;
 599         }
 600 }
 601
 602 /************************************************************************
 603  Load the user.SAMBA_PAI attribute.
 604 ************************************************************************/
 605
 606 static struct pai_val *fload_inherited_info(files_struct *fsp)
 607 {
 608         char *pai_buf;
 609         size_t pai_buf_size = 1024;
 610         struct pai_val *paiv = NULL;
 611         ssize_t ret;
 612
 613         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 614                 return NULL;
 615         }
 616
 617         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 618                 return NULL;
 619         }
 620
 621         do {
 622                 if (fsp->fh->fd != -1) {
 623                         ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 624                                         pai_buf, pai_buf_size);
 625                 } else {
 626                         ret = SMB_VFS_GETXATTR(fsp->conn,
 627                                                fsp->fsp_name->base_name,
 628                                                SAMBA_POSIX_INHERITANCE_EA_NAME,
 629                                                pai_buf, pai_buf_size);
 630                 }
 631
 632                 if (ret == -1) {
 633                         if (errno != ERANGE) {
 634                                 break;
 635                         }
 636                         /* Buffer too small - enlarge it. */
 637                         pai_buf_size *= 2;
 638                         SAFE_FREE(pai_buf);
 639                         if (pai_buf_size > 1024*1024) {
 640                                 return NULL; /* Limit malloc to 1mb. */
 641                         }
 642                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 643                                 return NULL;
 644                 }
 645         } while (ret == -1);
 646
 647         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
 648                   (unsigned long)ret, fsp_str_dbg(fsp)));
 649
 650         if (ret == -1) {
 651                 /* No attribute or not supported. */
 652 #if defined(ENOATTR)
 653                 if (errno != ENOATTR)
 654                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 655 #else
 656                 if (errno != ENOSYS)
 657                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 658 #endif
 659                 SAFE_FREE(pai_buf);
 660                 return NULL;
 661         }
 662
 663         paiv = create_pai_val(pai_buf, ret);
 664
 665         if (paiv) {
 666                 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
 667                           (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
 668         }
 669
 670         SAFE_FREE(pai_buf);
 671         return paiv;
 672 }
 673
 674 /************************************************************************
 675  Load the user.SAMBA_PAI attribute.
 676 ************************************************************************/
 677
 678 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
 679                                            const char *fname)
 680 {
 681         char *pai_buf;
 682         size_t pai_buf_size = 1024;
 683         struct pai_val *paiv = NULL;
 684         ssize_t ret;
 685
 686         if (!lp_map_acl_inherit(SNUM(conn))) {
 687                 return NULL;
 688         }
 689
 690         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 691                 return NULL;
 692         }
 693
 694         do {
 695                 ret = SMB_VFS_GETXATTR(conn, fname,
 696                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 697                                        pai_buf, pai_buf_size);
 698
 699                 if (ret == -1) {
 700                         if (errno != ERANGE) {
 701                                 break;
 702                         }
 703                         /* Buffer too small - enlarge it. */
 704                         pai_buf_size *= 2;
 705                         SAFE_FREE(pai_buf);
 706                         if (pai_buf_size > 1024*1024) {
 707                                 return NULL; /* Limit malloc to 1mb. */
 708                         }
 709                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 710                                 return NULL;
 711                 }
 712         } while (ret == -1);
 713
 714         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
 715
 716         if (ret == -1) {
 717                 /* No attribute or not supported. */
 718 #if defined(ENOATTR)
 719                 if (errno != ENOATTR)
 720                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 721 #else
 722                 if (errno != ENOSYS)
 723                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 724 #endif
 725                 SAFE_FREE(pai_buf);
 726                 return NULL;
 727         }
 728
 729         paiv = create_pai_val(pai_buf, ret);
 730
 731         if (paiv) {
 732                 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
 733                         (unsigned int)paiv->sd_type,
 734                         fname));
 735         }
 736
 737         SAFE_FREE(pai_buf);
 738         return paiv;
 739 }
 740
 741 /****************************************************************************
 742  Functions to manipulate the internal ACE format.
 743 ****************************************************************************/
 744
 745 /****************************************************************************
 746  Count a linked list of canonical ACE entries.
 747 ****************************************************************************/
 748
 749 static size_t count_canon_ace_list( canon_ace *l_head )
 750 {
 751         size_t count = 0;
 752         canon_ace *ace;
 753
 754         for (ace = l_head; ace; ace = ace->next)
 755                 count++;
 756
 757         return count;
 758 }
 759
 760 /****************************************************************************
 761  Free a linked list of canonical ACE entries.
 762 ****************************************************************************/
 763
 764 static void free_canon_ace_list( canon_ace *l_head )
 765 {
 766         canon_ace *list, *next;
 767
 768         for (list = l_head; list; list = next) {
 769                 next = list->next;
 770                 DLIST_REMOVE(l_head, list);
 771                 SAFE_FREE(list);
 772         }
 773 }
 774
 775 /****************************************************************************
 776  Function to duplicate a canon_ace entry.
 777 ****************************************************************************/
 778
 779 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 780 {
 781         canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
 782
 783         if (dst_ace == NULL)
 784                 return NULL;
 785
 786         *dst_ace = *src_ace;
 787         dst_ace->prev = dst_ace->next = NULL;
 788         return dst_ace;
 789 }
 790
 791 /****************************************************************************
 792  Print out a canon ace.
 793 ****************************************************************************/
 794
 795 static void print_canon_ace(canon_ace *pace, int num)
 796 {
 797         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 798         dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
 799         if (pace->owner_type == UID_ACE) {
 800                 const char *u_name = uidtoname(pace->unix_ug.uid);
 801                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
 802         } else if (pace->owner_type == GID_ACE) {
 803                 char *g_name = gidtoname(pace->unix_ug.gid);
 804                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
 805         } else
 806                 dbgtext( "other ");
 807         switch (pace->type) {
 808                 case SMB_ACL_USER:
 809                         dbgtext( "SMB_ACL_USER ");
 810                         break;
 811                 case SMB_ACL_USER_OBJ:
 812                         dbgtext( "SMB_ACL_USER_OBJ ");
 813                         break;
 814                 case SMB_ACL_GROUP:
 815                         dbgtext( "SMB_ACL_GROUP ");
 816                         break;
 817                 case SMB_ACL_GROUP_OBJ:
 818                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 819                         break;
 820                 case SMB_ACL_OTHER:
 821                         dbgtext( "SMB_ACL_OTHER ");
 822                         break;
 823                 default:
 824                         dbgtext( "MASK " );
 825                         break;
 826         }
 827
 828         dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
 829         dbgtext( "perms ");
 830         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 831         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 832         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 833 }
 834
 835 /****************************************************************************
 836  Print out a canon ace list.
 837 ****************************************************************************/
 838
 839 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 840 {
 841         int count = 0;
 842
 843         if( DEBUGLVL( 10 )) {
 844                 dbgtext( "print_canon_ace_list: %s\n", name );
 845                 for (;ace_list; ace_list = ace_list->next, count++)
 846                         print_canon_ace(ace_list, count );
 847         }
 848 }
 849
 850 /****************************************************************************
 851  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 852 ****************************************************************************/
 853
 854 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
 855 {
 856         mode_t ret = 0;
 857
 858         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
 859         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 860         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 861
 862         return ret;
 863 }
 864
 865 /****************************************************************************
 866  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 867 ****************************************************************************/
 868
 869 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 870 {
 871         mode_t ret = 0;
 872
 873         if (mode & r_mask)
 874                 ret |= S_IRUSR;
 875         if (mode & w_mask)
 876                 ret |= S_IWUSR;
 877         if (mode & x_mask)
 878                 ret |= S_IXUSR;
 879
 880         return ret;
 881 }
 882
 883 /****************************************************************************
 884  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 885  an SMB_ACL_PERMSET_T.
 886 ****************************************************************************/
 887
 888 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 889 {
 890         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1)
 891                 return -1;
 892         if (mode & S_IRUSR) {
 893                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
 894                         return -1;
 895         }
 896         if (mode & S_IWUSR) {
 897                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
 898                         return -1;
 899         }
 900         if (mode & S_IXUSR) {
 901                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
 902                         return -1;
 903         }
 904         return 0;
 905 }
 906
 907 /****************************************************************************
 908  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 909 ****************************************************************************/
 910
 911 void create_file_sids(const SMB_STRUCT_STAT *psbuf, struct dom_sid *powner_sid, struct dom_sid *pgroup_sid)
 912 {
 913         uid_to_sid( powner_sid, psbuf->st_ex_uid );
 914         gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
 915 }
 916
 917 /****************************************************************************
 918  Merge aces with a common sid - if both are allow or deny, OR the permissions together and
 919  delete the second one. If the first is deny, mask the permissions off and delete the allow
 920  if the permissions become zero, delete the deny if the permissions are non zero.
 921 ****************************************************************************/
 922
 923 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
 924 {
 925         canon_ace *l_head = *pp_list_head;
 926         canon_ace *curr_ace_outer;
 927         canon_ace *curr_ace_outer_next;
 928
 929         /*
 930          * First, merge allow entries with identical SIDs, and deny entries
 931          * with identical SIDs.
 932          */
 933
 934         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 935                 canon_ace *curr_ace;
 936                 canon_ace *curr_ace_next;
 937
 938                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 939
 940                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 941                         bool can_merge = false;
 942
 943                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 944
 945                         /* For file ACLs we can merge if the SIDs and ALLOW/DENY
 946                          * types are the same. For directory acls we must also
 947                          * ensure the POSIX ACL types are the same. */
 948
 949                         if (!dir_acl) {
 950                                 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 951                                                 (curr_ace->attr == curr_ace_outer->attr));
 952                         } else {
 953                                 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 954                                                 (curr_ace->type == curr_ace_outer->type) &&
 955                                                 (curr_ace->attr == curr_ace_outer->attr));
 956                         }
 957
 958                         if (can_merge) {
 959                                 if( DEBUGLVL( 10 )) {
 960                                         dbgtext("merge_aces: Merging ACE's\n");
 961                                         print_canon_ace( curr_ace_outer, 0);
 962                                         print_canon_ace( curr_ace, 0);
 963                                 }
 964
 965                                 /* Merge two allow or two deny ACE's. */
 966
 967                                 /* Theoretically we shouldn't merge a dir ACE if
 968                                  * one ACE has the CI flag set, and the other
 969                                  * ACE has the OI flag set, but this is rare
 970                                  * enough we can ignore it. */
 971
 972                                 curr_ace_outer->perms |= curr_ace->perms;
 973                                 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
 974                                 DLIST_REMOVE(l_head, curr_ace);
 975                                 SAFE_FREE(curr_ace);
 976                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 977                         }
 978                 }
 979         }
 980
 981         /*
 982          * Now go through and mask off allow permissions with deny permissions.
 983          * We can delete either the allow or deny here as we know that each SID
 984          * appears only once in the list.
 985          */
 986
 987         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 988                 canon_ace *curr_ace;
 989                 canon_ace *curr_ace_next;
 990
 991                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 992
 993                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 994
 995                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 996
 997                         /*
 998                          * Subtract ACE's with different entries. Due to the ordering constraints
 999                          * we've put on the ACL, we know the deny must be the first one.
1000                          */
1001
1002                         if (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1003                                 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1004
1005                                 if( DEBUGLVL( 10 )) {
1006                                         dbgtext("merge_aces: Masking ACE's\n");
1007                                         print_canon_ace( curr_ace_outer, 0);
1008                                         print_canon_ace( curr_ace, 0);
1009                                 }
1010
1011                                 curr_ace->perms &= ~curr_ace_outer->perms;
1012
1013                                 if (curr_ace->perms == 0) {
1014
1015                                         /*
1016                                          * The deny overrides the allow. Remove the allow.
1017                                          */
1018
1019                                         DLIST_REMOVE(l_head, curr_ace);
1020                                         SAFE_FREE(curr_ace);
1021                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1022
1023                                 } else {
1024
1025                                         /*
1026                                          * Even after removing permissions, there
1027                                          * are still allow permissions - delete the deny.
1028                                          * It is safe to delete the deny here,
1029                                          * as we are guarenteed by the deny first
1030                                          * ordering that all the deny entries for
1031                                          * this SID have already been merged into one
1032                                          * before we can get to an allow ace.
1033                                          */
1034
1035                                         DLIST_REMOVE(l_head, curr_ace_outer);
1036                                         SAFE_FREE(curr_ace_outer);
1037                                         break;
1038                                 }
1039                         }
1040
1041                 } /* end for curr_ace */
1042         } /* end for curr_ace_outer */
1043
1044         /* We may have modified the list. */
1045
1046         *pp_list_head = l_head;
1047 }
1048
1049 /****************************************************************************
1050  Check if we need to return NT4.x compatible ACL entries.
1051 ****************************************************************************/
1052
1053 bool nt4_compatible_acls(void)
1054 {
1055         int compat = lp_acl_compatibility();
1056
1057         if (compat == ACL_COMPAT_AUTO) {
1058                 enum remote_arch_types ra_type = get_remote_arch();
1059
1060                 /* Automatically adapt to client */
1061                 return (ra_type <= RA_WINNT);
1062         } else
1063                 return (compat == ACL_COMPAT_WINNT);
1064 }
1065
1066
1067 /****************************************************************************
1068  Map canon_ace perms to permission bits NT.
1069  The attr element is not used here - we only process deny entries on set,
1070  not get. Deny entries are implicit on get with ace->perms = 0.
1071 ****************************************************************************/
1072
1073 uint32_t map_canon_ace_perms(int snum,
1074                                 enum security_ace_type *pacl_type,
1075                                 mode_t perms,
1076                                 bool directory_ace)
1077 {
1078         uint32_t nt_mask = 0;
1079
1080         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1081
1082         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1083                 if (directory_ace) {
1084                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1085                 } else {
1086                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1087                 }
1088         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1089                 /*
1090                  * Windows NT refuses to display ACEs with no permissions in them (but
1091                  * they are perfectly legal with Windows 2000). If the ACE has empty
1092                  * permissions we cannot use 0, so we use the otherwise unused
1093                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1094                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1095                  * to be changed in the future.
1096                  */
1097
1098                 if (nt4_compatible_acls())
1099                         nt_mask = UNIX_ACCESS_NONE;
1100                 else
1101                         nt_mask = 0;
1102         } else {
1103                 if (directory_ace) {
1104                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1105                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1106                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1107                 } else {
1108                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1109                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1110                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1111                 }
1112         }
1113
1114         if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1115                 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1116         }
1117
1118         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1119                         (unsigned int)perms, (unsigned int)nt_mask ));
1120
1121         return nt_mask;
1122 }
1123
1124 /****************************************************************************
1125  Map NT perms to a UNIX mode_t.
1126 ****************************************************************************/
1127
1128 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
1129 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
1130 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1131
1132 static mode_t map_nt_perms( uint32 *mask, int type)
1133 {
1134         mode_t mode = 0;
1135
1136         switch(type) {
1137         case S_IRUSR:
1138                 if((*mask) & GENERIC_ALL_ACCESS)
1139                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1140                 else {
1141                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1142                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1143                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1144                 }
1145                 break;
1146         case S_IRGRP:
1147                 if((*mask) & GENERIC_ALL_ACCESS)
1148                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1149                 else {
1150                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1151                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1152                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1153                 }
1154                 break;
1155         case S_IROTH:
1156                 if((*mask) & GENERIC_ALL_ACCESS)
1157                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1158                 else {
1159                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1160                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1161                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1162                 }
1163                 break;
1164         }
1165
1166         return mode;
1167 }
1168
1169 /****************************************************************************
1170  Unpack a struct security_descriptor into a UNIX owner and group.
1171 ****************************************************************************/
1172
1173 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1174                         uid_t *puser, gid_t *pgrp,
1175                         uint32 security_info_sent, const struct
1176                         security_descriptor *psd)
1177 {
1178         struct dom_sid owner_sid;
1179         struct dom_sid grp_sid;
1180
1181         *puser = (uid_t)-1;
1182         *pgrp = (gid_t)-1;
1183
1184         if(security_info_sent == 0) {
1185                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1186                 return NT_STATUS_OK;
1187         }
1188
1189         /*
1190          * Validate the owner and group SID's.
1191          */
1192
1193         memset(&owner_sid, '\0', sizeof(owner_sid));
1194         memset(&grp_sid, '\0', sizeof(grp_sid));
1195
1196         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1197
1198         /*
1199          * Don't immediately fail if the owner sid cannot be validated.
1200          * This may be a group chown only set.
1201          */
1202
1203         if (security_info_sent & SECINFO_OWNER) {
1204                 sid_copy(&owner_sid, psd->owner_sid);
1205                 if (!sid_to_uid(&owner_sid, puser)) {
1206                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1207                                 /* this allows take ownership to work
1208                                  * reasonably */
1209                                 *puser = get_current_uid(conn);
1210                         } else {
1211                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1212                                          " owner sid for %s\n",
1213                                          sid_string_dbg(&owner_sid)));
1214                                 return NT_STATUS_INVALID_OWNER;
1215                         }
1216                 }
1217                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1218                          (unsigned int)*puser ));
1219         }
1220
1221         /*
1222          * Don't immediately fail if the group sid cannot be validated.
1223          * This may be an owner chown only set.
1224          */
1225
1226         if (security_info_sent & SECINFO_GROUP) {
1227                 sid_copy(&grp_sid, psd->group_sid);
1228                 if (!sid_to_gid( &grp_sid, pgrp)) {
1229                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1230                                 /* this allows take group ownership to work
1231                                  * reasonably */
1232                                 *pgrp = get_current_gid(conn);
1233                         } else {
1234                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1235                                          " group sid.\n"));
1236                                 return NT_STATUS_INVALID_OWNER;
1237                         }
1238                 }
1239                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1240                          (unsigned int)*pgrp));
1241         }
1242
1243         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1244
1245         return NT_STATUS_OK;
1246 }
1247
1248 /****************************************************************************
1249  Ensure the enforced permissions for this share apply.
1250 ****************************************************************************/
1251
1252 static void apply_default_perms(const struct share_params *params,
1253                                 const bool is_directory, canon_ace *pace,
1254                                 mode_t type)
1255 {
1256         mode_t and_bits = (mode_t)0;
1257         mode_t or_bits = (mode_t)0;
1258
1259         /* Get the initial bits to apply. */
1260
1261         if (is_directory) {
1262                 and_bits = lp_dir_security_mask(params->service);
1263                 or_bits = lp_force_dir_security_mode(params->service);
1264         } else {
1265                 and_bits = lp_security_mask(params->service);
1266                 or_bits = lp_force_security_mode(params->service);
1267         }
1268
1269         /* Now bounce them into the S_USR space. */
1270         switch(type) {
1271         case S_IRUSR:
1272                 /* Ensure owner has read access. */
1273                 pace->perms |= S_IRUSR;
1274                 if (is_directory)
1275                         pace->perms |= (S_IWUSR|S_IXUSR);
1276                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1277                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1278                 break;
1279         case S_IRGRP:
1280                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1281                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1282                 break;
1283         case S_IROTH:
1284                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1285                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1286                 break;
1287         }
1288
1289         pace->perms = ((pace->perms & and_bits)|or_bits);
1290 }
1291
1292 /****************************************************************************
1293  Check if a given uid/SID is in a group gid/SID. This is probably very
1294  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1295 ****************************************************************************/
1296
1297 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1298 {
1299         const char *u_name = NULL;
1300
1301         /* "Everyone" always matches every uid. */
1302
1303         if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1304                 return True;
1305
1306         /*
1307          * if it's the current user, we already have the unix token
1308          * and don't need to do the complex user_in_group_sid() call
1309          */
1310         if (uid_ace->unix_ug.uid == get_current_uid(conn)) {
1311                 const struct security_unix_token *curr_utok = NULL;
1312                 size_t i;
1313
1314                 if (group_ace->unix_ug.gid == get_current_gid(conn)) {
1315                         return True;
1316                 }
1317
1318                 curr_utok = get_current_utok(conn);
1319                 for (i=0; i < curr_utok->ngroups; i++) {
1320                         if (group_ace->unix_ug.gid == curr_utok->groups[i]) {
1321                                 return True;
1322                         }
1323                 }
1324         }
1325
1326         /* u_name talloc'ed off tos. */
1327         u_name = uidtoname(uid_ace->unix_ug.uid);
1328         if (!u_name) {
1329                 return False;
1330         }
1331
1332         /*
1333          * user_in_group_sid() uses create_token_from_username()
1334          * which creates an artificial NT token given just a username,
1335          * so this is not reliable for users from foreign domains
1336          * exported by winbindd!
1337          */
1338         return user_in_group_sid(u_name, &group_ace->trustee);
1339 }
1340
1341 /****************************************************************************
1342  A well formed POSIX file or default ACL has at least 3 entries, a
1343  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1344  In addition, the owner must always have at least read access.
1345  When using this call on get_acl, the pst struct is valid and contains
1346  the mode of the file. When using this call on set_acl, the pst struct has
1347  been modified to have a mode containing the default for this file or directory
1348  type.
1349 ****************************************************************************/
1350
1351 static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
1352                                      const struct share_params *params,
1353                                      const bool is_directory,
1354                                                         const struct dom_sid *pfile_owner_sid,
1355                                                         const struct dom_sid *pfile_grp_sid,
1356                                                         const SMB_STRUCT_STAT *pst,
1357                                                         bool setting_acl)
1358 {
1359         canon_ace *pace;
1360         bool got_user = False;
1361         bool got_grp = False;
1362         bool got_other = False;
1363         canon_ace *pace_other = NULL;
1364
1365         for (pace = *pp_ace; pace; pace = pace->next) {
1366                 if (pace->type == SMB_ACL_USER_OBJ) {
1367
1368                         if (setting_acl)
1369                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1370                         got_user = True;
1371
1372                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1373
1374                         /*
1375                          * Ensure create mask/force create mode is respected on set.
1376                          */
1377
1378                         if (setting_acl)
1379                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1380                         got_grp = True;
1381
1382                 } else if (pace->type == SMB_ACL_OTHER) {
1383
1384                         /*
1385                          * Ensure create mask/force create mode is respected on set.
1386                          */
1387
1388                         if (setting_acl)
1389                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1390                         got_other = True;
1391                         pace_other = pace;
1392                 }
1393         }
1394
1395         if (!got_user) {
1396                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1397                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1398                         return False;
1399                 }
1400
1401                 ZERO_STRUCTP(pace);
1402                 pace->type = SMB_ACL_USER_OBJ;
1403                 pace->owner_type = UID_ACE;
1404                 pace->unix_ug.uid = pst->st_ex_uid;
1405                 pace->trustee = *pfile_owner_sid;
1406                 pace->attr = ALLOW_ACE;
1407
1408                 if (setting_acl) {
1409                         /* See if the owning user is in any of the other groups in
1410                            the ACE. If so, OR in the permissions from that group. */
1411
1412                         bool group_matched = False;
1413                         canon_ace *pace_iter;
1414
1415                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1416                                 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1417                                         if (uid_entry_in_group(conn, pace, pace_iter)) {
1418                                                 pace->perms |= pace_iter->perms;
1419                                                 group_matched = True;
1420                                         }
1421                                 }
1422                         }
1423
1424                         /* If we only got an "everyone" perm, just use that. */
1425                         if (!group_matched) {
1426                                 if (got_other)
1427                                         pace->perms = pace_other->perms;
1428                                 else
1429                                         pace->perms = 0;
1430                         }
1431
1432                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1433                 } else {
1434                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1435                 }
1436
1437                 DLIST_ADD(*pp_ace, pace);
1438         }
1439
1440         if (!got_grp) {
1441                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1442                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1443                         return False;
1444                 }
1445
1446                 ZERO_STRUCTP(pace);
1447                 pace->type = SMB_ACL_GROUP_OBJ;
1448                 pace->owner_type = GID_ACE;
1449                 pace->unix_ug.uid = pst->st_ex_gid;
1450                 pace->trustee = *pfile_grp_sid;
1451                 pace->attr = ALLOW_ACE;
1452                 if (setting_acl) {
1453                         /* If we only got an "everyone" perm, just use that. */
1454                         if (got_other)
1455                                 pace->perms = pace_other->perms;
1456                         else
1457                                 pace->perms = 0;
1458                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1459                 } else {
1460                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1461                 }
1462
1463                 DLIST_ADD(*pp_ace, pace);
1464         }
1465
1466         if (!got_other) {
1467                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1468                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1469                         return False;
1470                 }
1471
1472                 ZERO_STRUCTP(pace);
1473                 pace->type = SMB_ACL_OTHER;
1474                 pace->owner_type = WORLD_ACE;
1475                 pace->unix_ug.world = -1;
1476                 pace->trustee = global_sid_World;
1477                 pace->attr = ALLOW_ACE;
1478                 if (setting_acl) {
1479                         pace->perms = 0;
1480                         apply_default_perms(params, is_directory, pace, S_IROTH);
1481                 } else
1482                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1483
1484                 DLIST_ADD(*pp_ace, pace);
1485         }
1486
1487         return True;
1488 }
1489
1490 /****************************************************************************
1491  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1492  If it does not have them, check if there are any entries where the trustee is the
1493  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1494 ****************************************************************************/
1495
1496 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1497 {
1498         bool got_user_obj, got_group_obj;
1499         canon_ace *current_ace;
1500         int i, entries;
1501
1502         entries = count_canon_ace_list(ace);
1503         got_user_obj = False;
1504         got_group_obj = False;
1505
1506         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1507                 if (current_ace->type == SMB_ACL_USER_OBJ)
1508                         got_user_obj = True;
1509                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1510                         got_group_obj = True;
1511         }
1512         if (got_user_obj && got_group_obj) {
1513                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1514                 return;
1515         }
1516
1517         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1518                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1519                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1520                         current_ace->type = SMB_ACL_USER_OBJ;
1521                         got_user_obj = True;
1522                 }
1523                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1524                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1525                         current_ace->type = SMB_ACL_GROUP_OBJ;
1526                         got_group_obj = True;
1527                 }
1528         }
1529         if (!got_user_obj)
1530                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1531         if (!got_group_obj)
1532                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1533 }
1534
1535 /****************************************************************************
1536  If an ACE entry is SMB_ACL_USER_OBJ and not CREATOR_OWNER, map to SMB_ACL_USER.
1537  If an ACE entry is SMB_ACL_GROUP_OBJ and not CREATOR_GROUP, map to SMB_ACL_GROUP
1538 ****************************************************************************/
1539
1540 static bool dup_owning_ace(canon_ace *dir_ace, canon_ace *ace)
1541 {
1542         /* dir ace must be followings.
1543            SMB_ACL_USER_OBJ : trustee(CREATOR_OWNER) -> Posix ACL d:u::perm
1544            SMB_ACL_USER     : not trustee    -> Posix ACL u:user:perm
1545            SMB_ACL_USER_OBJ : trustee -> convert to SMB_ACL_USER : trustee
1546            Posix ACL u:trustee:perm
1547
1548            SMB_ACL_GROUP_OBJ: trustee(CREATOR_GROUP) -> Posix ACL d:g::perm
1549            SMB_ACL_GROUP    : not trustee   -> Posix ACL g:group:perm
1550            SMB_ACL_GROUP_OBJ: trustee -> convert to SMB_ACL_GROUP : trustee
1551            Posix ACL g:trustee:perm
1552         */
1553
1554         if (ace->type == SMB_ACL_USER_OBJ &&
1555                         !(dom_sid_equal(&ace->trustee, &global_sid_Creator_Owner))) {
1556                 canon_ace *dup_ace = dup_canon_ace(ace);
1557
1558                 if (dup_ace == NULL) {
1559                         return false;
1560                 }
1561                 dup_ace->type = SMB_ACL_USER;
1562                 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1563         }
1564
1565         if (ace->type == SMB_ACL_GROUP_OBJ &&
1566                         !(dom_sid_equal(&ace->trustee, &global_sid_Creator_Group))) {
1567                 canon_ace *dup_ace = dup_canon_ace(ace);
1568
1569                 if (dup_ace == NULL) {
1570                         return false;
1571                 }
1572                 dup_ace->type = SMB_ACL_GROUP;
1573                 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1574         }
1575
1576         return true;
1577 }
1578
1579 /****************************************************************************
1580  Unpack a struct security_descriptor into two canonical ace lists.
1581 ****************************************************************************/
1582
1583 static bool create_canon_ace_lists(files_struct *fsp,
1584                                         const SMB_STRUCT_STAT *pst,
1585                                         struct dom_sid *pfile_owner_sid,
1586                                         struct dom_sid *pfile_grp_sid,
1587                                         canon_ace **ppfile_ace,
1588                                         canon_ace **ppdir_ace,
1589                                         const struct security_acl *dacl)
1590 {
1591         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1592         canon_ace *file_ace = NULL;
1593         canon_ace *dir_ace = NULL;
1594         canon_ace *current_ace = NULL;
1595         bool got_dir_allow = False;
1596         bool got_file_allow = False;
1597         int i, j;
1598
1599         *ppfile_ace = NULL;
1600         *ppdir_ace = NULL;
1601
1602         /*
1603          * Convert the incoming ACL into a more regular form.
1604          */
1605
1606         for(i = 0; i < dacl->num_aces; i++) {
1607                 struct security_ace *psa = &dacl->aces[i];
1608
1609                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1610                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1611                         return False;
1612                 }
1613
1614                 if (nt4_compatible_acls()) {
1615                         /*
1616                          * The security mask may be UNIX_ACCESS_NONE which should map into
1617                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1618                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1619                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1620                          */
1621
1622                         /*
1623                          * Convert GENERIC bits to specific bits.
1624                          */
1625
1626                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1627
1628                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1629
1630                         if(psa->access_mask != UNIX_ACCESS_NONE)
1631                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1632                 }
1633         }
1634
1635         /*
1636          * Deal with the fact that NT 4.x re-writes the canonical format
1637          * that we return for default ACLs. If a directory ACE is identical
1638          * to a inherited directory ACE then NT changes the bits so that the
1639          * first ACE is set to OI|IO and the second ACE for this SID is set
1640          * to CI. We need to repair this. JRA.
1641          */
1642
1643         for(i = 0; i < dacl->num_aces; i++) {
1644                 struct security_ace *psa1 = &dacl->aces[i];
1645
1646                 for (j = i + 1; j < dacl->num_aces; j++) {
1647                         struct security_ace *psa2 = &dacl->aces[j];
1648
1649                         if (psa1->access_mask != psa2->access_mask)
1650                                 continue;
1651
1652                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1653                                 continue;
1654
1655                         /*
1656                          * Ok - permission bits and SIDs are equal.
1657                          * Check if flags were re-written.
1658                          */
1659
1660                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1661
1662                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1663                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1664
1665                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1666
1667                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1668                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1669
1670                         }
1671                 }
1672         }
1673
1674         for(i = 0; i < dacl->num_aces; i++) {
1675                 struct security_ace *psa = &dacl->aces[i];
1676
1677                 /*
1678                  * Create a canon_ace entry representing this NT DACL ACE.
1679                  */
1680
1681                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1682                         free_canon_ace_list(file_ace);
1683                         free_canon_ace_list(dir_ace);
1684                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1685                         return False;
1686                 }
1687
1688                 ZERO_STRUCTP(current_ace);
1689
1690                 sid_copy(&current_ace->trustee, &psa->trustee);
1691
1692                 /*
1693                  * Try and work out if the SID is a user or group
1694                  * as we need to flag these differently for POSIX.
1695                  * Note what kind of a POSIX ACL this should map to.
1696                  */
1697
1698                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1699                         current_ace->owner_type = WORLD_ACE;
1700                         current_ace->unix_ug.world = -1;
1701                         current_ace->type = SMB_ACL_OTHER;
1702                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1703                         current_ace->owner_type = UID_ACE;
1704                         current_ace->unix_ug.uid = pst->st_ex_uid;
1705                         current_ace->type = SMB_ACL_USER_OBJ;
1706
1707                         /*
1708                          * The Creator Owner entry only specifies inheritable permissions,
1709                          * never access permissions. WinNT doesn't always set the ACE to
1710                          * INHERIT_ONLY, though.
1711                          */
1712
1713                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1714
1715                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1716                         current_ace->owner_type = GID_ACE;
1717                         current_ace->unix_ug.gid = pst->st_ex_gid;
1718                         current_ace->type = SMB_ACL_GROUP_OBJ;
1719
1720                         /*
1721                          * The Creator Group entry only specifies inheritable permissions,
1722                          * never access permissions. WinNT doesn't always set the ACE to
1723                          * INHERIT_ONLY, though.
1724                          */
1725                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1726
1727                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1728                         current_ace->owner_type = UID_ACE;
1729                         /* If it's the owning user, this is a user_obj, not
1730                          * a user. */
1731                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1732                                 current_ace->type = SMB_ACL_USER_OBJ;
1733                         } else {
1734                                 current_ace->type = SMB_ACL_USER;
1735                         }
1736                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1737                         current_ace->owner_type = GID_ACE;
1738                         /* If it's the primary group, this is a group_obj, not
1739                          * a group. */
1740                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1741                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1742                         } else {
1743                                 current_ace->type = SMB_ACL_GROUP;
1744                         }
1745                 } else {
1746                         /*
1747                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1748                          */
1749
1750                         if (non_mappable_sid(&psa->trustee)) {
1751                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1752                                            "non-mappable SID %s\n",
1753                                            sid_string_dbg(&psa->trustee)));
1754                                 SAFE_FREE(current_ace);
1755                                 continue;
1756                         }
1757
1758                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1759                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1760                                         "unknown or foreign SID %s\n",
1761                                         sid_string_dbg(&psa->trustee)));
1762                                 SAFE_FREE(current_ace);
1763                                 continue;
1764                         }
1765
1766                         free_canon_ace_list(file_ace);
1767                         free_canon_ace_list(dir_ace);
1768                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1769                                   "%s to uid or gid.\n",
1770                                   sid_string_dbg(&current_ace->trustee)));
1771                         SAFE_FREE(current_ace);
1772                         return False;
1773                 }
1774
1775                 /*
1776                  * Map the given NT permissions into a UNIX mode_t containing only
1777                  * S_I(R|W|X)USR bits.
1778                  */
1779
1780                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1781                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1782
1783                 /* Store the ace_flag. */
1784                 current_ace->ace_flags = psa->flags;
1785
1786                 /*
1787                  * Now add the created ace to either the file list, the directory
1788                  * list, or both. We *MUST* preserve the order here (hence we use
1789                  * DLIST_ADD_END) as NT ACLs are order dependent.
1790                  */
1791
1792                 if (fsp->is_directory) {
1793
1794                         /*
1795                          * We can only add to the default POSIX ACE list if the ACE is
1796                          * designed to be inherited by both files and directories.
1797                          */
1798
1799                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1800                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1801
1802                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1803
1804                                 /*
1805                                  * Note if this was an allow ace. We can't process
1806                                  * any further deny ace's after this.
1807                                  */
1808
1809                                 if (current_ace->attr == ALLOW_ACE)
1810                                         got_dir_allow = True;
1811
1812                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1813                                         DEBUG(0,("create_canon_ace_lists: "
1814                                                  "malformed ACL in "
1815                                                  "inheritable ACL! Deny entry "
1816                                                  "after Allow entry. Failing "
1817                                                  "to set on file %s.\n",
1818                                                  fsp_str_dbg(fsp)));
1819                                         free_canon_ace_list(file_ace);
1820                                         free_canon_ace_list(dir_ace);
1821                                         return False;
1822                                 }
1823
1824                                 if( DEBUGLVL( 10 )) {
1825                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1826                                         print_canon_ace( current_ace, 0);
1827                                 }
1828
1829                                 /*
1830                                  * We have a lossy mapping: directory ACE entries
1831                                  * CREATOR_OWNER ------\
1832                                  *     (map to)         +---> SMB_ACL_USER_OBJ
1833                                  * owning sid    ------/
1834                                  *
1835                                  * CREATOR_GROUP ------\
1836                                  *     (map to)         +---> SMB_ACL_GROUP_OBJ
1837                                  * primary group sid --/
1838                                  *
1839                                  * on set. And on read of a directory ACL
1840                                  *
1841                                  * SMB_ACL_USER_OBJ ----> CREATOR_OWNER
1842                                  * SMB_ACL_GROUP_OBJ ---> CREATOR_GROUP.
1843                                  *
1844                                  * Deal with this on set by duplicating
1845                                  * owning sid and primary group sid ACE
1846                                  * entries into the directory ACL.
1847                                  * Fix from Tsukasa Hamano <hamano@osstech.co.jp>.
1848                                  */
1849
1850                                 if (!dup_owning_ace(dir_ace, current_ace)) {
1851                                         DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1852                                         free_canon_ace_list(file_ace);
1853                                         free_canon_ace_list(dir_ace);
1854                                         return false;
1855                                 }
1856
1857                                 /*
1858                                  * If this is not an inherit only ACE we need to add a duplicate
1859                                  * to the file acl.
1860                                  */
1861
1862                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1863                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1864
1865                                         if (!dup_ace) {
1866                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1867                                                 free_canon_ace_list(file_ace);
1868                                                 free_canon_ace_list(dir_ace);
1869                                                 return False;
1870                                         }
1871
1872                                         /*
1873                                          * We must not free current_ace here as its
1874                                          * pointer is now owned by the dir_ace list.
1875                                          */
1876                                         current_ace = dup_ace;
1877                                         /* We've essentially split this ace into two,
1878                                          * and added the ace with inheritance request
1879                                          * bits to the directory ACL. Drop those bits for
1880                                          * the ACE we're adding to the file list. */
1881                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1882                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1883                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1884                                 } else {
1885                                         /*
1886                                          * We must not free current_ace here as its
1887                                          * pointer is now owned by the dir_ace list.
1888                                          */
1889                                         current_ace = NULL;
1890                                 }
1891                         }
1892                 }
1893
1894                 /*
1895                  * Only add to the file ACL if not inherit only.
1896                  */
1897
1898                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1899                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1900
1901                         /*
1902                          * Note if this was an allow ace. We can't process
1903                          * any further deny ace's after this.
1904                          */
1905
1906                         if (current_ace->attr == ALLOW_ACE)
1907                                 got_file_allow = True;
1908
1909                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1910                                 DEBUG(0,("create_canon_ace_lists: malformed "
1911                                          "ACL in file ACL ! Deny entry after "
1912                                          "Allow entry. Failing to set on file "
1913                                          "%s.\n", fsp_str_dbg(fsp)));
1914                                 free_canon_ace_list(file_ace);
1915                                 free_canon_ace_list(dir_ace);
1916                                 return False;
1917                         }
1918
1919                         if( DEBUGLVL( 10 )) {
1920                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1921                                 print_canon_ace( current_ace, 0);
1922                         }
1923                         all_aces_are_inherit_only = False;
1924                         /*
1925                          * We must not free current_ace here as its
1926                          * pointer is now owned by the file_ace list.
1927                          */
1928                         current_ace = NULL;
1929                 }
1930
1931                 /*
1932                  * Free if ACE was not added.
1933                  */
1934
1935                 SAFE_FREE(current_ace);
1936         }
1937
1938         if (fsp->is_directory && all_aces_are_inherit_only) {
1939                 /*
1940                  * Windows 2000 is doing one of these weird 'inherit acl'
1941                  * traverses to conserve NTFS ACL resources. Just pretend
1942                  * there was no DACL sent. JRA.
1943                  */
1944
1945                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1946                 free_canon_ace_list(file_ace);
1947                 free_canon_ace_list(dir_ace);
1948                 file_ace = NULL;
1949                 dir_ace = NULL;
1950         } else {
1951                 /*
1952                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1953                  * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1954                  * entries can be converted to *_OBJ. Usually we will already have these
1955                  * entries in the Default ACL, and the Access ACL will not have them.
1956                  */
1957                 if (file_ace) {
1958                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1959                 }
1960                 if (dir_ace) {
1961                         check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1962                 }
1963         }
1964
1965         *ppfile_ace = file_ace;
1966         *ppdir_ace = dir_ace;
1967
1968         return True;
1969 }
1970
1971 /****************************************************************************
1972  ASCII art time again... JRA :-).
1973
1974  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1975  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1976  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1977  allow or deny have been merged, so the same SID can only appear once in the deny
1978  list or once in the allow list.
1979
1980  We then process as follows :
1981
1982  ---------------------------------------------------------------------------
1983  First pass - look for a Everyone DENY entry.
1984
1985  If it is deny all (rwx) trunate the list at this point.
1986  Else, walk the list from this point and use the deny permissions of this
1987  entry as a mask on all following allow entries. Finally, delete
1988  the Everyone DENY entry (we have applied it to everything possible).
1989
1990  In addition, in this pass we remove any DENY entries that have
1991  no permissions (ie. they are a DENY nothing).
1992  ---------------------------------------------------------------------------
1993  Second pass - only deal with deny user entries.
1994
1995  DENY user1 (perms XXX)
1996
1997  new_perms = 0
1998  for all following allow group entries where user1 is in group
1999         new_perms |= group_perms;
2000
2001  user1 entry perms = new_perms & ~ XXX;
2002
2003  Convert the deny entry to an allow entry with the new perms and
2004  push to the end of the list. Note if the user was in no groups
2005  this maps to a specific allow nothing entry for this user.
2006
2007  The common case from the NT ACL choser (userX deny all) is
2008  optimised so we don't do the group lookup - we just map to
2009  an allow nothing entry.
2010
2011  What we're doing here is inferring the allow permissions the
2012  person setting the ACE on user1 wanted by looking at the allow
2013  permissions on the groups the user is currently in. This will
2014  be a snapshot, depending on group membership but is the best
2015  we can do and has the advantage of failing closed rather than
2016  open.
2017  ---------------------------------------------------------------------------
2018  Third pass - only deal with deny group entries.
2019
2020  DENY group1 (perms XXX)
2021
2022  for all following allow user entries where user is in group1
2023    user entry perms = user entry perms & ~ XXX;
2024
2025  If there is a group Everyone allow entry with permissions YYY,
2026  convert the group1 entry to an allow entry and modify its
2027  permissions to be :
2028
2029  new_perms = YYY & ~ XXX
2030
2031  and push to the end of the list.
2032
2033  If there is no group Everyone allow entry then convert the
2034  group1 entry to a allow nothing entry and push to the end of the list.
2035
2036  Note that the common case from the NT ACL choser (groupX deny all)
2037  cannot be optimised here as we need to modify user entries who are
2038  in the group to change them to a deny all also.
2039
2040  What we're doing here is modifying the allow permissions of
2041  user entries (which are more specific in POSIX ACLs) to mask
2042  out the explicit deny set on the group they are in. This will
2043  be a snapshot depending on current group membership but is the
2044  best we can do and has the advantage of failing closed rather
2045  than open.
2046  ---------------------------------------------------------------------------
2047  Fourth pass - cope with cumulative permissions.
2048
2049  for all allow user entries, if there exists an allow group entry with
2050  more permissive permissions, and the user is in that group, rewrite the
2051  allow user permissions to contain both sets of permissions.
2052
2053  Currently the code for this is #ifdef'ed out as these semantics make
2054  no sense to me. JRA.
2055  ---------------------------------------------------------------------------
2056
2057  Note we *MUST* do the deny user pass first as this will convert deny user
2058  entries into allow user entries which can then be processed by the deny
2059  group pass.
2060
2061  The above algorithm took a *lot* of thinking about - hence this
2062  explaination :-). JRA.
2063 ****************************************************************************/
2064
2065 /****************************************************************************
2066  Process a canon_ace list entries. This is very complex code. We need
2067  to go through and remove the "deny" permissions from any allow entry that matches
2068  the id of this entry. We have already refused any NT ACL that wasn't in correct
2069  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2070  we just remove it (to fail safe). We have already removed any duplicate ace
2071  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2072  allow entries.
2073 ****************************************************************************/
2074
2075 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2076 {
2077         canon_ace *ace_list = *pp_ace_list;
2078         canon_ace *curr_ace = NULL;
2079         canon_ace *curr_ace_next = NULL;
2080
2081         /* Pass 1 above - look for an Everyone, deny entry. */
2082
2083         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2084                 canon_ace *allow_ace_p;
2085
2086                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2087
2088                 if (curr_ace->attr != DENY_ACE)
2089                         continue;
2090
2091                 if (curr_ace->perms == (mode_t)0) {
2092
2093                         /* Deny nothing entry - delete. */
2094
2095                         DLIST_REMOVE(ace_list, curr_ace);
2096                         continue;
2097                 }
2098
2099                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2100                         continue;
2101
2102                 /* JRATEST - assert. */
2103                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2104
2105                 if (curr_ace->perms == ALL_ACE_PERMS) {
2106
2107                         /*
2108                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2109                          * list at this point including this entry.
2110                          */
2111
2112                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2113
2114                         free_canon_ace_list( curr_ace );
2115                         if (prev_entry)
2116                                 DLIST_REMOVE(ace_list, prev_entry);
2117                         else {
2118                                 /* We deleted the entire list. */
2119                                 ace_list = NULL;
2120                         }
2121                         break;
2122                 }
2123
2124                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2125
2126                         /*
2127                          * Only mask off allow entries.
2128                          */
2129
2130                         if (allow_ace_p->attr != ALLOW_ACE)
2131                                 continue;
2132
2133                         allow_ace_p->perms &= ~curr_ace->perms;
2134                 }
2135
2136                 /*
2137                  * Now it's been applied, remove it.
2138                  */
2139
2140                 DLIST_REMOVE(ace_list, curr_ace);
2141         }
2142
2143         /* Pass 2 above - deal with deny user entries. */
2144
2145         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2146                 mode_t new_perms = (mode_t)0;
2147                 canon_ace *allow_ace_p;
2148
2149                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2150
2151                 if (curr_ace->attr != DENY_ACE)
2152                         continue;
2153
2154                 if (curr_ace->owner_type != UID_ACE)
2155                         continue;
2156
2157                 if (curr_ace->perms == ALL_ACE_PERMS) {
2158
2159                         /*
2160                          * Optimisation - this is a deny everything to this user.
2161                          * Convert to an allow nothing and push to the end of the list.
2162                          */
2163
2164                         curr_ace->attr = ALLOW_ACE;
2165                         curr_ace->perms = (mode_t)0;
2166                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2167                         continue;
2168                 }
2169
2170                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2171
2172                         if (allow_ace_p->attr != ALLOW_ACE)
2173                                 continue;
2174
2175                         /* We process GID_ACE and WORLD_ACE entries only. */
2176
2177                         if (allow_ace_p->owner_type == UID_ACE)
2178                                 continue;
2179
2180                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2181                                 new_perms |= allow_ace_p->perms;
2182                 }
2183
2184                 /*
2185                  * Convert to a allow entry, modify the perms and push to the end
2186                  * of the list.
2187                  */
2188
2189                 curr_ace->attr = ALLOW_ACE;
2190                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2191                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2192         }
2193
2194         /* Pass 3 above - deal with deny group entries. */
2195
2196         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2197                 canon_ace *allow_ace_p;
2198                 canon_ace *allow_everyone_p = NULL;
2199
2200                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2201
2202                 if (curr_ace->attr != DENY_ACE)
2203                         continue;
2204
2205                 if (curr_ace->owner_type != GID_ACE)
2206                         continue;
2207
2208                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2209
2210                         if (allow_ace_p->attr != ALLOW_ACE)
2211                                 continue;
2212
2213                         /* Store a pointer to the Everyone allow, if it exists. */
2214                         if (allow_ace_p->owner_type == WORLD_ACE)
2215                                 allow_everyone_p = allow_ace_p;
2216
2217                         /* We process UID_ACE entries only. */
2218
2219                         if (allow_ace_p->owner_type != UID_ACE)
2220                                 continue;
2221
2222                         /* Mask off the deny group perms. */
2223
2224                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2225                                 allow_ace_p->perms &= ~curr_ace->perms;
2226                 }
2227
2228                 /*
2229                  * Convert the deny to an allow with the correct perms and
2230                  * push to the end of the list.
2231                  */
2232
2233                 curr_ace->attr = ALLOW_ACE;
2234                 if (allow_everyone_p)
2235                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2236                 else
2237                         curr_ace->perms = (mode_t)0;
2238                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2239         }
2240
2241         /* Doing this fourth pass allows Windows semantics to be layered
2242          * on top of POSIX semantics. I'm not sure if this is desirable.
2243          * For example, in W2K ACLs there is no way to say, "Group X no
2244          * access, user Y full access" if user Y is a member of group X.
2245          * This seems completely broken semantics to me.... JRA.
2246          */
2247
2248 #if 0
2249         /* Pass 4 above - deal with allow entries. */
2250
2251         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2252                 canon_ace *allow_ace_p;
2253
2254                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2255
2256                 if (curr_ace->attr != ALLOW_ACE)
2257                         continue;
2258
2259                 if (curr_ace->owner_type != UID_ACE)
2260                         continue;
2261
2262                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2263
2264                         if (allow_ace_p->attr != ALLOW_ACE)
2265                                 continue;
2266
2267                         /* We process GID_ACE entries only. */
2268
2269                         if (allow_ace_p->owner_type != GID_ACE)
2270                                 continue;
2271
2272                         /* OR in the group perms. */
2273
2274                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2275                                 curr_ace->perms |= allow_ace_p->perms;
2276                 }
2277         }
2278 #endif
2279
2280         *pp_ace_list = ace_list;
2281 }
2282
2283 /****************************************************************************
2284  Create a default mode that will be used if a security descriptor entry has
2285  no user/group/world entries.
2286 ****************************************************************************/
2287
2288 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2289 {
2290         int snum = SNUM(fsp->conn);
2291         mode_t and_bits = (mode_t)0;
2292         mode_t or_bits = (mode_t)0;
2293         mode_t mode;
2294
2295         if (interitable_mode) {
2296                 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2297                                  fsp->fsp_name, NULL);
2298         } else {
2299                 mode = S_IRUSR;
2300         }
2301
2302         if (fsp->is_directory)
2303                 mode |= (S_IWUSR|S_IXUSR);
2304
2305         /*
2306          * Now AND with the create mode/directory mode bits then OR with the
2307          * force create mode/force directory mode bits.
2308          */
2309
2310         if (fsp->is_directory) {
2311                 and_bits = lp_dir_security_mask(snum);
2312                 or_bits = lp_force_dir_security_mode(snum);
2313         } else {
2314                 and_bits = lp_security_mask(snum);
2315                 or_bits = lp_force_security_mode(snum);
2316         }
2317
2318         return ((mode & and_bits)|or_bits);
2319 }
2320
2321 /****************************************************************************
2322  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2323  succeeding.
2324 ****************************************************************************/
2325
2326 static bool unpack_canon_ace(files_struct *fsp,
2327                                 const SMB_STRUCT_STAT *pst,
2328                                 struct dom_sid *pfile_owner_sid,
2329                                 struct dom_sid *pfile_grp_sid,
2330                                 canon_ace **ppfile_ace,
2331                                 canon_ace **ppdir_ace,
2332                                 uint32 security_info_sent,
2333                                 const struct security_descriptor *psd)
2334 {
2335         SMB_STRUCT_STAT st;
2336         canon_ace *file_ace = NULL;
2337         canon_ace *dir_ace = NULL;
2338
2339         *ppfile_ace = NULL;
2340         *ppdir_ace = NULL;
2341
2342         if(security_info_sent == 0) {
2343                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2344                 return False;
2345         }
2346
2347         /*
2348          * If no DACL then this is a chown only security descriptor.
2349          */
2350
2351         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2352                 return True;
2353
2354         /*
2355          * Now go through the DACL and create the canon_ace lists.
2356          */
2357
2358         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2359                                                                 &file_ace, &dir_ace, psd->dacl))
2360                 return False;
2361
2362         if ((file_ace == NULL) && (dir_ace == NULL)) {
2363                 /* W2K traverse DACL set - ignore. */
2364                 return True;
2365         }
2366
2367         /*
2368          * Go through the canon_ace list and merge entries
2369          * belonging to identical users of identical allow or deny type.
2370          * We can do this as all deny entries come first, followed by
2371          * all allow entries (we have mandated this before accepting this acl).
2372          */
2373
2374         print_canon_ace_list( "file ace - before merge", file_ace);
2375         merge_aces( &file_ace, false);
2376
2377         print_canon_ace_list( "dir ace - before merge", dir_ace);
2378         merge_aces( &dir_ace, true);
2379
2380         /*
2381          * NT ACLs are order dependent. Go through the acl lists and
2382          * process DENY entries by masking the allow entries.
2383          */
2384
2385         print_canon_ace_list( "file ace - before deny", file_ace);
2386         process_deny_list(fsp->conn, &file_ace);
2387
2388         print_canon_ace_list( "dir ace - before deny", dir_ace);
2389         process_deny_list(fsp->conn, &dir_ace);
2390
2391         /*
2392          * A well formed POSIX file or default ACL has at least 3 entries, a
2393          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2394          * and optionally a mask entry. Ensure this is the case.
2395          */
2396
2397         print_canon_ace_list( "file ace - before valid", file_ace);
2398
2399         st = *pst;
2400
2401         /*
2402          * A default 3 element mode entry for a file should be r-- --- ---.
2403          * A default 3 element mode entry for a directory should be rwx --- ---.
2404          */
2405
2406         st.st_ex_mode = create_default_mode(fsp, False);
2407
2408         if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2409                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2410                 free_canon_ace_list(file_ace);
2411                 free_canon_ace_list(dir_ace);
2412                 return False;
2413         }
2414
2415         print_canon_ace_list( "dir ace - before valid", dir_ace);
2416
2417         /*
2418          * A default inheritable 3 element mode entry for a directory should be the
2419          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2420          * it's a directory.
2421          */
2422
2423         st.st_ex_mode = create_default_mode(fsp, True);
2424
2425         if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2426                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2427                 free_canon_ace_list(file_ace);
2428                 free_canon_ace_list(dir_ace);
2429                 return False;
2430         }
2431
2432         print_canon_ace_list( "file ace - return", file_ace);
2433         print_canon_ace_list( "dir ace - return", dir_ace);
2434
2435         *ppfile_ace = file_ace;
2436         *ppdir_ace = dir_ace;
2437         return True;
2438
2439 }
2440
2441 /******************************************************************************
2442  When returning permissions, try and fit NT display
2443  semantics if possible. Note the the canon_entries here must have been malloced.
2444  The list format should be - first entry = owner, followed by group and other user
2445  entries, last entry = other.
2446
2447  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2448  are not ordered, and match on the most specific entry rather than walking a list,
2449  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2450
2451  Entry 0: owner : deny all except read and write.
2452  Entry 1: owner : allow read and write.
2453  Entry 2: group : deny all except read.
2454  Entry 3: group : allow read.
2455  Entry 4: Everyone : allow read.
2456
2457  But NT cannot display this in their ACL editor !
2458 ********************************************************************************/
2459
2460 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2461 {
2462         canon_ace *l_head = *pp_list_head;
2463         canon_ace *owner_ace = NULL;
2464         canon_ace *other_ace = NULL;
2465         canon_ace *ace = NULL;
2466
2467         for (ace = l_head; ace; ace = ace->next) {
2468                 if (ace->type == SMB_ACL_USER_OBJ)
2469                         owner_ace = ace;
2470                 else if (ace->type == SMB_ACL_OTHER) {
2471                         /* Last ace - this is "other" */
2472                         other_ace = ace;
2473                 }
2474         }
2475
2476         if (!owner_ace || !other_ace) {
2477                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2478                         filename ));
2479                 return;
2480         }
2481
2482         /*
2483          * The POSIX algorithm applies to owner first, and other last,
2484          * so ensure they are arranged in this order.
2485          */
2486
2487         if (owner_ace) {
2488                 DLIST_PROMOTE(l_head, owner_ace);
2489         }
2490
2491         if (other_ace) {
2492                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2493         }
2494
2495         /* We have probably changed the head of the list. */
2496
2497         *pp_list_head = l_head;
2498 }
2499
2500 /****************************************************************************
2501  Create a linked list of canonical ACE entries.
2502 ****************************************************************************/
2503
2504 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2505                                    const char *fname, SMB_ACL_T posix_acl,
2506                                    const SMB_STRUCT_STAT *psbuf,
2507                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2508 {
2509         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2510         canon_ace *l_head = NULL;
2511         canon_ace *ace = NULL;
2512         canon_ace *next_ace = NULL;
2513         int entry_id = SMB_ACL_FIRST_ENTRY;
2514         SMB_ACL_ENTRY_T entry;
2515         size_t ace_count;
2516
2517         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2518                 SMB_ACL_TAG_T tagtype;
2519                 SMB_ACL_PERMSET_T permset;
2520                 struct dom_sid sid;
2521                 posix_id unix_ug;
2522                 enum ace_owner owner_type;
2523
2524                 entry_id = SMB_ACL_NEXT_ENTRY;
2525
2526                 /* Is this a MASK entry ? */
2527                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2528                         continue;
2529
2530                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2531                         continue;
2532
2533                 /* Decide which SID to use based on the ACL type. */
2534                 switch(tagtype) {
2535                         case SMB_ACL_USER_OBJ:
2536                                 /* Get the SID from the owner. */
2537                                 sid_copy(&sid, powner);
2538                                 unix_ug.uid = psbuf->st_ex_uid;
2539                                 owner_type = UID_ACE;
2540                                 break;
2541                         case SMB_ACL_USER:
2542                                 {
2543                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2544                                         if (puid == NULL) {
2545                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2546                                                 continue;
2547                                         }
2548                                         uid_to_sid( &sid, *puid);
2549                                         unix_ug.uid = *puid;
2550                                         owner_type = UID_ACE;
2551                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2552                                         break;
2553                                 }
2554                         case SMB_ACL_GROUP_OBJ:
2555                                 /* Get the SID from the owning group. */
2556                                 sid_copy(&sid, pgroup);
2557                                 unix_ug.gid = psbuf->st_ex_gid;
2558                                 owner_type = GID_ACE;
2559                                 break;
2560                         case SMB_ACL_GROUP:
2561                                 {
2562                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2563                                         if (pgid == NULL) {
2564                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2565                                                 continue;
2566                                         }
2567                                         gid_to_sid( &sid, *pgid);
2568                                         unix_ug.gid = *pgid;
2569                                         owner_type = GID_ACE;
2570                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2571                                         break;
2572                                 }
2573                         case SMB_ACL_MASK:
2574                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2575                                 continue; /* Don't count the mask as an entry. */
2576                         case SMB_ACL_OTHER:
2577                                 /* Use the Everyone SID */
2578                                 sid = global_sid_World;
2579                                 unix_ug.world = -1;
2580                                 owner_type = WORLD_ACE;
2581                                 break;
2582                         default:
2583                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2584                                 continue;
2585                 }
2586
2587                 /*
2588                  * Add this entry to the list.
2589                  */
2590
2591                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2592                         goto fail;
2593
2594                 ZERO_STRUCTP(ace);
2595                 ace->type = tagtype;
2596                 ace->perms = convert_permset_to_mode_t(conn, permset);
2597                 ace->attr = ALLOW_ACE;
2598                 ace->trustee = sid;
2599                 ace->unix_ug = unix_ug;
2600                 ace->owner_type = owner_type;
2601                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2602
2603                 DLIST_ADD(l_head, ace);
2604         }
2605
2606         /*
2607          * This next call will ensure we have at least a user/group/world set.
2608          */
2609
2610         if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2611                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2612                                       psbuf, False))
2613                 goto fail;
2614
2615         /*
2616          * Now go through the list, masking the permissions with the
2617          * acl_mask. Ensure all DENY Entries are at the start of the list.
2618          */
2619
2620         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2621
2622         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2623                 next_ace = ace->next;
2624
2625                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2626                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2627                         ace->perms &= acl_mask;
2628
2629                 if (ace->perms == 0) {
2630                         DLIST_PROMOTE(l_head, ace);
2631                 }
2632
2633                 if( DEBUGLVL( 10 ) ) {
2634                         print_canon_ace(ace, ace_count);
2635                 }
2636         }
2637
2638         arrange_posix_perms(fname,&l_head );
2639
2640         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2641
2642         return l_head;
2643
2644   fail:
2645
2646         free_canon_ace_list(l_head);
2647         return NULL;
2648 }
2649
2650 /****************************************************************************
2651  Check if the current user group list contains a given group.
2652 ****************************************************************************/
2653
2654 static bool current_user_in_group(connection_struct *conn, gid_t gid)
2655 {
2656         int i;
2657         const struct security_unix_token *utok = get_current_utok(conn);
2658
2659         for (i = 0; i < utok->ngroups; i++) {
2660                 if (utok->groups[i] == gid) {
2661                         return True;
2662                 }
2663         }
2664
2665         return False;
2666 }
2667
2668 /****************************************************************************
2669  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2670 ****************************************************************************/
2671
2672 static bool acl_group_override(connection_struct *conn,
2673                                const struct smb_filename *smb_fname)
2674 {
2675         if ((errno != EPERM) && (errno != EACCES)) {
2676                 return false;
2677         }
2678
2679         /* file primary group == user primary or supplementary group */
2680         if (lp_acl_group_control(SNUM(conn)) &&
2681             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2682                 return true;
2683         }
2684
2685         /* user has writeable permission */
2686         if (lp_dos_filemode(SNUM(conn)) &&
2687             can_write_to_file(conn, smb_fname)) {
2688                 return true;
2689         }
2690
2691         return false;
2692 }
2693
2694 /****************************************************************************
2695  Attempt to apply an ACL to a file or directory.
2696 ****************************************************************************/
2697
2698 static bool set_canon_ace_list(files_struct *fsp,
2699                                 canon_ace *the_ace,
2700                                 bool default_ace,
2701                                 const SMB_STRUCT_STAT *psbuf,
2702                                 bool *pacl_set_support)
2703 {
2704         connection_struct *conn = fsp->conn;
2705         bool ret = False;
2706         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2707         canon_ace *p_ace;
2708         int i;
2709         SMB_ACL_ENTRY_T mask_entry;
2710         bool got_mask_entry = False;
2711         SMB_ACL_PERMSET_T mask_permset;
2712         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2713         bool needs_mask = False;
2714         mode_t mask_perms = 0;
2715
2716         /* Use the psbuf that was passed in. */
2717         if (psbuf != &fsp->fsp_name->st) {
2718                 fsp->fsp_name->st = *psbuf;
2719         }
2720
2721 #if defined(POSIX_ACL_NEEDS_MASK)
2722         /* HP-UX always wants to have a mask (called "class" there). */
2723         needs_mask = True;
2724 #endif
2725
2726         if (the_acl == NULL) {
2727
2728                 if (!no_acl_syscall_error(errno)) {
2729                         /*
2730                          * Only print this error message if we have some kind of ACL
2731                          * support that's not working. Otherwise we would always get this.
2732                          */
2733                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2734                                 default_ace ? "default" : "file", strerror(errno) ));
2735                 }
2736                 *pacl_set_support = False;
2737                 goto fail;
2738         }
2739
2740         if( DEBUGLVL( 10 )) {
2741                 dbgtext("set_canon_ace_list: setting ACL:\n");
2742                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2743                         print_canon_ace( p_ace, i);
2744                 }
2745         }
2746
2747         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2748                 SMB_ACL_ENTRY_T the_entry;
2749                 SMB_ACL_PERMSET_T the_permset;
2750
2751                 /*
2752                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2753                  * named group entries. But if there is an ACL_MASK entry, it applies
2754                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2755                  * so that it doesn't deny (i.e., mask off) any permissions.
2756                  */
2757
2758                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2759                         needs_mask = True;
2760                         mask_perms |= p_ace->perms;
2761                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2762                         mask_perms |= p_ace->perms;
2763                 }
2764
2765                 /*
2766                  * Get the entry for this ACE.
2767                  */
2768
2769                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2770                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2771                                 i, strerror(errno) ));
2772                         goto fail;
2773                 }
2774
2775                 if (p_ace->type == SMB_ACL_MASK) {
2776                         mask_entry = the_entry;
2777                         got_mask_entry = True;
2778                 }
2779
2780                 /*
2781                  * Ok - we now know the ACL calls should be working, don't
2782                  * allow fallback to chmod.
2783                  */
2784
2785                 *pacl_set_support = True;
2786
2787                 /*
2788                  * Initialise the entry from the canon_ace.
2789                  */
2790
2791                 /*
2792                  * First tell the entry what type of ACE this is.
2793                  */
2794
2795                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2796                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2797                                 i, strerror(errno) ));
2798                         goto fail;
2799                 }
2800
2801                 /*
2802                  * Only set the qualifier (user or group id) if the entry is a user
2803                  * or group id ACE.
2804                  */
2805
2806                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2807                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2808                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2809                                         i, strerror(errno) ));
2810                                 goto fail;
2811                         }
2812                 }
2813
2814                 /*
2815                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2816                  */
2817
2818                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2819                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2820                                 i, strerror(errno) ));
2821                         goto fail;
2822                 }
2823
2824                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2825                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2826                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2827                         goto fail;
2828                 }
2829
2830                 /*
2831                  * ..and apply them to the entry.
2832                  */
2833
2834                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2835                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2836                                 i, strerror(errno) ));
2837                         goto fail;
2838                 }
2839
2840                 if( DEBUGLVL( 10 ))
2841                         print_canon_ace( p_ace, i);
2842
2843         }
2844
2845         if (needs_mask && !got_mask_entry) {
2846                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2847                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2848                         goto fail;
2849                 }
2850
2851                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2852                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2853                         goto fail;
2854                 }
2855
2856                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2857                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2858                         goto fail;
2859                 }
2860
2861                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2862                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2863                         goto fail;
2864                 }
2865
2866                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2867                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2868                         goto fail;
2869                 }
2870         }
2871
2872         /*
2873          * Finally apply it to the file or directory.
2874          */
2875
2876         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2877                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2878                                              the_acl_type, the_acl) == -1) {
2879                         /*
2880                          * Some systems allow all the above calls and only fail with no ACL support
2881                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2882                          */
2883                         if (no_acl_syscall_error(errno)) {
2884                                 *pacl_set_support = False;
2885                         }
2886
2887                         if (acl_group_override(conn, fsp->fsp_name)) {
2888                                 int sret;
2889
2890                                 DEBUG(5,("set_canon_ace_list: acl group "
2891                                          "control on and current user in file "
2892                                          "%s primary group.\n",
2893                                          fsp_str_dbg(fsp)));
2894
2895                                 become_root();
2896                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2897                                     fsp->fsp_name->base_name, the_acl_type,
2898                                     the_acl);
2899                                 unbecome_root();
2900                                 if (sret == 0) {
2901                                         ret = True;
2902                                 }
2903                         }
2904
2905                         if (ret == False) {
2906                                 DEBUG(2,("set_canon_ace_list: "
2907                                          "sys_acl_set_file type %s failed for "
2908                                          "file %s (%s).\n",
2909                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2910                                          "directory default" : "file",
2911                                          fsp_str_dbg(fsp), strerror(errno)));
2912                                 goto fail;
2913                         }
2914                 }
2915         } else {
2916                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2917                         /*
2918                          * Some systems allow all the above calls and only fail with no ACL support
2919                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2920                          */
2921                         if (no_acl_syscall_error(errno)) {
2922                                 *pacl_set_support = False;
2923                         }
2924
2925                         if (acl_group_override(conn, fsp->fsp_name)) {
2926                                 int sret;
2927
2928                                 DEBUG(5,("set_canon_ace_list: acl group "
2929                                          "control on and current user in file "
2930                                          "%s primary group.\n",
2931                                          fsp_str_dbg(fsp)));
2932
2933                                 become_root();
2934                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2935                                 unbecome_root();
2936                                 if (sret == 0) {
2937                                         ret = True;
2938                                 }
2939                         }
2940
2941                         if (ret == False) {
2942                                 DEBUG(2,("set_canon_ace_list: "
2943                                          "sys_acl_set_file failed for file %s "
2944                                          "(%s).\n",
2945                                          fsp_str_dbg(fsp), strerror(errno)));
2946                                 goto fail;
2947                         }
2948                 }
2949         }
2950
2951         ret = True;
2952
2953   fail:
2954
2955         if (the_acl != NULL) {
2956                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2957         }
2958
2959         return ret;
2960 }
2961
2962 /****************************************************************************
2963  Find a particular canon_ace entry.
2964 ****************************************************************************/
2965
2966 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2967 {
2968         while (list) {
2969                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2970                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2971                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2972                         break;
2973                 list = list->next;
2974         }
2975         return list;
2976 }
2977
2978 /****************************************************************************
2979
2980 ****************************************************************************/
2981
2982 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2983 {
2984         SMB_ACL_ENTRY_T entry;
2985
2986         if (!the_acl)
2987                 return NULL;
2988         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2989                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2990                 return NULL;
2991         }
2992         return the_acl;
2993 }
2994
2995 /****************************************************************************
2996  Convert a canon_ace to a generic 3 element permission - if possible.
2997 ****************************************************************************/
2998
2999 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3000
3001 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3002 {
3003         int snum = SNUM(fsp->conn);
3004         size_t ace_count = count_canon_ace_list(file_ace_list);
3005         canon_ace *ace_p;
3006         canon_ace *owner_ace = NULL;
3007         canon_ace *group_ace = NULL;
3008         canon_ace *other_ace = NULL;
3009         mode_t and_bits;
3010         mode_t or_bits;
3011
3012         if (ace_count != 3) {
3013                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3014                          "entries for file %s to convert to posix perms.\n",
3015                          fsp_str_dbg(fsp)));
3016                 return False;
3017         }
3018
3019         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3020                 if (ace_p->owner_type == UID_ACE)
3021                         owner_ace = ace_p;
3022                 else if (ace_p->owner_type == GID_ACE)
3023                         group_ace = ace_p;
3024                 else if (ace_p->owner_type == WORLD_ACE)
3025                         other_ace = ace_p;
3026         }
3027
3028         if (!owner_ace || !group_ace || !other_ace) {
3029                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3030                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3031                 return False;
3032         }
3033
3034         *posix_perms = (mode_t)0;
3035
3036         *posix_perms |= owner_ace->perms;
3037         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3038         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3039         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3040         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3041         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3042         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3043
3044         /* The owner must have at least read access. */
3045
3046         *posix_perms |= S_IRUSR;
3047         if (fsp->is_directory)
3048                 *posix_perms |= (S_IWUSR|S_IXUSR);
3049
3050         /* If requested apply the masks. */
3051
3052         /* Get the initial bits to apply. */
3053
3054         if (fsp->is_directory) {
3055                 and_bits = lp_dir_security_mask(snum);
3056                 or_bits = lp_force_dir_security_mode(snum);
3057         } else {
3058                 and_bits = lp_security_mask(snum);
3059                 or_bits = lp_force_security_mode(snum);
3060         }
3061
3062         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3063
3064         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3065                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3066                   (int)group_ace->perms, (int)other_ace->perms,
3067                   (int)*posix_perms, fsp_str_dbg(fsp)));
3068
3069         return True;
3070 }
3071
3072 /****************************************************************************
3073   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3074   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3075   with CI|OI set so it is inherited and also applies to the directory.
3076   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3077 ****************************************************************************/
3078
3079 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3080 {
3081         size_t i, j;
3082
3083         for (i = 0; i < num_aces; i++) {
3084                 for (j = i+1; j < num_aces; j++) {
3085                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3086                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3087                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3088                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3089
3090                         /* We know the lower number ACE's are file entries. */
3091                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3092                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3093                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3094                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3095                                 (i_inh == j_inh) &&
3096                                 (i_flags_ni == 0) &&
3097                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3098                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3099                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3100                                 /*
3101                                  * W2K wants to have access allowed zero access ACE's
3102                                  * at the end of the list. If the mask is zero, merge
3103                                  * the non-inherited ACE onto the inherited ACE.
3104                                  */
3105
3106                                 if (nt_ace_list[i].access_mask == 0) {
3107                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3108                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3109                                         if (num_aces - i - 1 > 0)
3110                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3111                                                                 sizeof(struct security_ace));
3112
3113                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3114                                                 (unsigned int)i, (unsigned int)j ));
3115                                 } else {
3116                                         /*
3117                                          * These are identical except for the flags.
3118                                          * Merge the inherited ACE onto the non-inherited ACE.
3119                                          */
3120
3121                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3122                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3123                                         if (num_aces - j - 1 > 0)
3124                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3125                                                                 sizeof(struct security_ace));
3126
3127                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3128                                                 (unsigned int)j, (unsigned int)i ));
3129                                 }
3130                                 num_aces--;
3131                                 break;
3132                         }
3133                 }
3134         }
3135
3136         return num_aces;
3137 }
3138
3139 /*
3140  * Add or Replace ACE entry.
3141  * In some cases we need to add a specific ACE for compatibility reasons.
3142  * When doing that we must make sure we are not actually creating a duplicate
3143  * entry. So we need to search whether an ACE entry already exist and eventually
3144  * replacce the access mask, or add a completely new entry if none was found.
3145  *
3146  * This function assumes the array has enough space to add a new entry without
3147  * any reallocation of memory.
3148  */
3149
3150 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3151                                 const struct dom_sid *sid, enum security_ace_type type,
3152                                 uint32_t mask, uint8_t flags)
3153 {
3154         int i;
3155
3156         /* first search for a duplicate */
3157         for (i = 0; i < *num_aces; i++) {
3158                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3159                     (nt_ace_list[i].flags == flags)) break;
3160         }
3161
3162         if (i < *num_aces) { /* found */
3163                 nt_ace_list[i].type = type;
3164                 nt_ace_list[i].access_mask = mask;
3165                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3166                            i, sid_string_dbg(sid), flags));
3167                 return;
3168         }
3169
3170         /* not found, append it */
3171         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3172 }
3173
3174
3175 /****************************************************************************
3176  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3177  the space for the return elements and returns the size needed to return the
3178  security descriptor. This should be the only external function needed for
3179  the UNIX style get ACL.
3180 ****************************************************************************/
3181
3182 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3183                                       const char *name,
3184                                       const SMB_STRUCT_STAT *sbuf,
3185                                       struct pai_val *pal,
3186                                       SMB_ACL_T posix_acl,
3187                                       SMB_ACL_T def_acl,
3188                                       uint32_t security_info,
3189                                       struct security_descriptor **ppdesc)
3190 {
3191         struct dom_sid owner_sid;
3192         struct dom_sid group_sid;
3193         size_t sd_size = 0;
3194         struct security_acl *psa = NULL;
3195         size_t num_acls = 0;
3196         size_t num_def_acls = 0;
3197         size_t num_aces = 0;
3198         canon_ace *file_ace = NULL;
3199         canon_ace *dir_ace = NULL;
3200         struct security_ace *nt_ace_list = NULL;
3201         size_t num_profile_acls = 0;
3202         struct dom_sid orig_owner_sid;
3203         struct security_descriptor *psd = NULL;
3204         int i;
3205
3206         /*
3207          * Get the owner, group and world SIDs.
3208          */
3209
3210         create_file_sids(sbuf, &owner_sid, &group_sid);
3211
3212         if (lp_profile_acls(SNUM(conn))) {
3213                 /* For WXP SP1 the owner must be administrators. */
3214                 sid_copy(&orig_owner_sid, &owner_sid);
3215                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3216                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3217                 num_profile_acls = 3;
3218         }
3219
3220         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3221
3222                 /*
3223                  * In the optimum case Creator Owner and Creator Group would be used for
3224                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3225                  * would lead to usability problems under Windows: The Creator entries
3226                  * are only available in browse lists of directories and not for files;
3227                  * additionally the identity of the owning group couldn't be determined.
3228                  * We therefore use those identities only for Default ACLs.
3229                  */
3230
3231                 /* Create the canon_ace lists. */
3232                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3233                                             &owner_sid, &group_sid, pal,
3234                                             SMB_ACL_TYPE_ACCESS);
3235
3236                 /* We must have *some* ACLS. */
3237
3238                 if (count_canon_ace_list(file_ace) == 0) {
3239                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3240                         goto done;
3241                 }
3242
3243                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3244                         dir_ace = canonicalise_acl(conn, name, def_acl,
3245                                                    sbuf,
3246                                                    &global_sid_Creator_Owner,
3247                                                    &global_sid_Creator_Group,
3248                                                    pal, SMB_ACL_TYPE_DEFAULT);
3249                 }
3250
3251                 /*
3252                  * Create the NT ACE list from the canonical ace lists.
3253                  */
3254
3255                 {
3256                         canon_ace *ace;
3257                         enum security_ace_type nt_acl_type;
3258
3259                         if (nt4_compatible_acls() && dir_ace) {
3260                                 /*
3261                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3262                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3263                                  * remove entries from the Access ACL if the
3264                                  * corresponding Default ACL entries have also been
3265                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3266                                  * are exceptions. We can do nothing
3267                                  * intelligent if the Default ACL contains entries that
3268                                  * are not also contained in the Access ACL, so this
3269                                  * case will still fail under NT 4.
3270                                  */
3271
3272                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3273                                 if (ace && !ace->perms) {
3274                                         DLIST_REMOVE(dir_ace, ace);
3275                                         SAFE_FREE(ace);
3276
3277                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3278                                         if (ace && !ace->perms) {
3279                                                 DLIST_REMOVE(file_ace, ace);
3280                                                 SAFE_FREE(ace);
3281                                         }
3282                                 }
3283
3284                                 /*
3285                                  * WinNT doesn't usually have Creator Group
3286                                  * in browse lists, so we send this entry to
3287                                  * WinNT even if it contains no relevant
3288                                  * permissions. Once we can add
3289                                  * Creator Group to browse lists we can
3290                                  * re-enable this.
3291                                  */
3292
3293 #if 0
3294                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3295                                 if (ace && !ace->perms) {
3296                                         DLIST_REMOVE(dir_ace, ace);
3297                                         SAFE_FREE(ace);
3298                                 }
3299 #endif
3300
3301                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3302                                 if (ace && !ace->perms) {
3303                                         DLIST_REMOVE(file_ace, ace);
3304                                         SAFE_FREE(ace);
3305                                 }
3306                         }
3307
3308                         num_acls = count_canon_ace_list(file_ace);
3309                         num_def_acls = count_canon_ace_list(dir_ace);
3310
3311                         /* Allocate the ace list. */
3312                         if ((nt_ace_list = SMB_MALLOC_ARRAY(struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3313                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3314                                 goto done;
3315                         }
3316
3317                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3318
3319                         /*
3320                          * Create the NT ACE list from the canonical ace lists.
3321                          */
3322
3323                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3324                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3325                                                 &nt_acl_type,
3326                                                 ace->perms,
3327                                                 S_ISDIR(sbuf->st_ex_mode));
3328                                 init_sec_ace(&nt_ace_list[num_aces++],
3329                                         &ace->trustee,
3330                                         nt_acl_type,
3331                                         acc,
3332                                         ace->ace_flags);
3333                         }
3334
3335                         /* The User must have access to a profile share - even
3336                          * if we can't map the SID. */
3337                         if (lp_profile_acls(SNUM(conn))) {
3338                                 add_or_replace_ace(nt_ace_list, &num_aces,
3339                                                    &global_sid_Builtin_Users,
3340                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3341                                                    FILE_GENERIC_ALL, 0);
3342                         }
3343
3344                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3345                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3346                                                 &nt_acl_type,
3347                                                 ace->perms,
3348                                                 S_ISDIR(sbuf->st_ex_mode));
3349                                 init_sec_ace(&nt_ace_list[num_aces++],
3350                                         &ace->trustee,
3351                                         nt_acl_type,
3352                                         acc,
3353                                         ace->ace_flags |
3354                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3355                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3356                                         SEC_ACE_FLAG_INHERIT_ONLY);
3357                         }
3358
3359                         /* The User must have access to a profile share - even
3360                          * if we can't map the SID. */
3361                         if (lp_profile_acls(SNUM(conn))) {
3362                                 add_or_replace_ace(nt_ace_list, &num_aces,
3363                                                 &global_sid_Builtin_Users,
3364                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3365                                                 FILE_GENERIC_ALL,
3366                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3367                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3368                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3369                         }
3370
3371                         /*
3372                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3373                          * Win2K needs this to get the inheritance correct when replacing ACLs
3374                          * on a directory tree. Based on work by Jim @ IBM.
3375                          */
3376
3377                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3378
3379                         if (lp_profile_acls(SNUM(conn))) {
3380                                 for (i = 0; i < num_aces; i++) {
3381                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3382                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3383                                                                    &orig_owner_sid,
3384                                                                    nt_ace_list[i].type,
3385                                                                    nt_ace_list[i].access_mask,
3386                                                                    nt_ace_list[i].flags);
3387                                                 break;
3388                                         }
3389                                 }
3390                         }
3391                 }
3392
3393                 if (num_aces) {
3394                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3395                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3396                                 goto done;
3397                         }
3398                 }
3399         } /* security_info & SECINFO_DACL */
3400
3401         psd = make_standard_sec_desc( talloc_tos(),
3402                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3403                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3404                         psa,
3405                         &sd_size);
3406
3407         if(!psd) {
3408                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3409                 sd_size = 0;
3410                 goto done;
3411         }
3412
3413         /*
3414          * Windows 2000: The DACL_PROTECTED flag in the security
3415          * descriptor marks the ACL as non-inheriting, i.e., no
3416          * ACEs from higher level directories propagate to this
3417          * ACL. In the POSIX ACL model permissions are only
3418          * inherited at file create time, so ACLs never contain
3419          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3420          * flag doesn't seem to bother Windows NT.
3421          * Always set this if map acl inherit is turned off.
3422          */
3423         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3424                 psd->type |= SEC_DESC_DACL_PROTECTED;
3425         } else {
3426                 psd->type |= pal->sd_type;
3427         }
3428
3429         if (psd->dacl) {
3430                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3431         }
3432
3433         *ppdesc = psd;
3434
3435  done:
3436
3437         if (posix_acl) {
3438                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3439         }
3440         if (def_acl) {
3441                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3442         }
3443         free_canon_ace_list(file_ace);
3444         free_canon_ace_list(dir_ace);
3445         free_inherited_info(pal);
3446         SAFE_FREE(nt_ace_list);
3447
3448         return NT_STATUS_OK;
3449 }
3450
3451 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3452                            struct security_descriptor **ppdesc)
3453 {
3454         SMB_STRUCT_STAT sbuf;
3455         SMB_ACL_T posix_acl = NULL;
3456         struct pai_val *pal;
3457
3458         *ppdesc = NULL;
3459
3460         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3461                   fsp_str_dbg(fsp)));
3462
3463         /* can it happen that fsp_name == NULL ? */
3464         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3465                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3466                                         security_info, ppdesc);
3467         }
3468
3469         /* Get the stat struct for the owner info. */
3470         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3471                 return map_nt_error_from_unix(errno);
3472         }
3473
3474         /* Get the ACL from the fd. */
3475         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3476
3477         pal = fload_inherited_info(fsp);
3478
3479         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3480                                        &sbuf, pal, posix_acl, NULL,
3481                                        security_info, ppdesc);
3482 }
3483
3484 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3485                           uint32_t security_info, struct security_descriptor **ppdesc)
3486 {
3487         SMB_ACL_T posix_acl = NULL;
3488         SMB_ACL_T def_acl = NULL;
3489         struct pai_val *pal;
3490         struct smb_filename smb_fname;
3491         int ret;
3492
3493         *ppdesc = NULL;
3494
3495         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3496
3497         ZERO_STRUCT(smb_fname);
3498         smb_fname.base_name = discard_const_p(char, name);
3499
3500         /* Get the stat struct for the owner info. */
3501         if (lp_posix_pathnames()) {
3502                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3503         } else {
3504                 ret = SMB_VFS_STAT(conn, &smb_fname);
3505         }
3506
3507         if (ret == -1) {
3508                 return map_nt_error_from_unix(errno);
3509         }
3510
3511         /* Get the ACL from the path. */
3512         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3513
3514         /* If it's a directory get the default POSIX ACL. */
3515         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3516                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3517                 def_acl = free_empty_sys_acl(conn, def_acl);
3518         }
3519
3520         pal = load_inherited_info(conn, name);
3521
3522         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3523                                        posix_acl, def_acl, security_info,
3524                                        ppdesc);
3525 }
3526
3527 /****************************************************************************
3528  Try to chown a file. We will be able to chown it under the following conditions.
3529
3530   1) If we have root privileges, then it will just work.
3531   2) If we have SeRestorePrivilege we can change the user + group to any other user.
3532   3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3533   4) If we have write permission to the file and dos_filemodes is set
3534      then allow chown to the currently authenticated user.
3535 ****************************************************************************/
3536
3537 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3538 {
3539         NTSTATUS status;
3540
3541         if(!CAN_WRITE(fsp->conn)) {
3542                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3543         }
3544
3545         /* Case (1). */
3546         status = vfs_chown_fsp(fsp, uid, gid);
3547         if (NT_STATUS_IS_OK(status)) {
3548                 return status;
3549         }
3550
3551         /* Case (2) / (3) */
3552         if (lp_enable_privileges()) {
3553                 bool has_take_ownership_priv = security_token_has_privilege(
3554                                                 get_current_nttok(fsp->conn),
3555                                                 SEC_PRIV_TAKE_OWNERSHIP);
3556                 bool has_restore_priv = security_token_has_privilege(
3557                                                 get_current_nttok(fsp->conn),
3558                                                 SEC_PRIV_RESTORE);
3559
3560                 if (has_restore_priv) {
3561                         ; /* Case (2) */
3562                 } else if (has_take_ownership_priv) {
3563                         /* Case (3) */
3564                         if (uid == get_current_uid(fsp->conn)) {
3565                                 gid = (gid_t)-1;
3566                         } else {
3567                                 has_take_ownership_priv = false;
3568                         }
3569                 }
3570
3571                 if (has_take_ownership_priv || has_restore_priv) {
3572                         become_root();
3573                         status = vfs_chown_fsp(fsp, uid, gid);
3574                         unbecome_root();
3575                         return status;
3576                 }
3577         }
3578
3579         /* Case (4). */
3580         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3581                 return NT_STATUS_ACCESS_DENIED;
3582         }
3583
3584         /* only allow chown to the current user. This is more secure,
3585            and also copes with the case where the SID in a take ownership ACL is
3586            a local SID on the users workstation
3587         */
3588         if (uid != get_current_uid(fsp->conn)) {
3589                 return NT_STATUS_ACCESS_DENIED;
3590         }
3591
3592         become_root();
3593         /* Keep the current file gid the same. */
3594         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3595         unbecome_root();
3596
3597         return status;
3598 }
3599
3600 #if 0
3601 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3602
3603 /****************************************************************************
3604  Take care of parent ACL inheritance.
3605 ****************************************************************************/
3606
3607 NTSTATUS append_parent_acl(files_struct *fsp,
3608                                 const struct security_descriptor *pcsd,
3609                                 struct security_descriptor **pp_new_sd)
3610 {
3611         struct smb_filename *smb_dname = NULL;
3612         struct security_descriptor *parent_sd = NULL;
3613         files_struct *parent_fsp = NULL;
3614         TALLOC_CTX *mem_ctx = talloc_tos();
3615         char *parent_name = NULL;
3616         struct security_ace *new_ace = NULL;
3617         unsigned int num_aces = pcsd->dacl->num_aces;
3618         NTSTATUS status;
3619         int info;
3620         unsigned int i, j;
3621         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3622         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3623
3624         if (psd == NULL) {
3625                 return NT_STATUS_NO_MEMORY;
3626         }
3627
3628         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3629                             NULL)) {
3630                 return NT_STATUS_NO_MEMORY;
3631         }
3632
3633         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3634                                             &smb_dname);
3635         if (!NT_STATUS_IS_OK(status)) {
3636                 goto fail;
3637         }
3638
3639         status = SMB_VFS_CREATE_FILE(
3640                 fsp->conn,                              /* conn */
3641                 NULL,                                   /* req */
3642                 0,                                      /* root_dir_fid */
3643                 smb_dname,                              /* fname */
3644                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3645                 FILE_SHARE_NONE,                        /* share_access */
3646                 FILE_OPEN,                              /* create_disposition*/
3647                 FILE_DIRECTORY_FILE,                    /* create_options */
3648                 0,                                      /* file_attributes */
3649                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3650                 0,                                      /* allocation_size */
3651                 NULL,                                   /* sd */
3652                 NULL,                                   /* ea_list */
3653                 &parent_fsp,                            /* result */
3654                 &info);                                 /* pinfo */
3655
3656         if (!NT_STATUS_IS_OK(status)) {
3657                 TALLOC_FREE(smb_dname);
3658                 return status;
3659         }
3660
3661         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3662                                     SECINFO_DACL, &parent_sd );
3663
3664         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3665         TALLOC_FREE(smb_dname);
3666
3667         if (!NT_STATUS_IS_OK(status)) {
3668                 return status;
3669         }
3670
3671         /*
3672          * Make room for potentially all the ACLs from
3673          * the parent. We used to add the ugw triple here,
3674          * as we knew we were dealing with POSIX ACLs.
3675          * We no longer need to do so as we can guarentee
3676          * that a default ACL from the parent directory will
3677          * be well formed for POSIX ACLs if it came from a
3678          * POSIX ACL source, and if we're not writing to a
3679          * POSIX ACL sink then we don't care if it's not well
3680          * formed. JRA.
3681          */
3682
3683         num_aces += parent_sd->dacl->num_aces;
3684
3685         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, struct security_ace,
3686                                         num_aces)) == NULL) {
3687                 return NT_STATUS_NO_MEMORY;
3688         }
3689
3690         /* Start by copying in all the given ACE entries. */
3691         for (i = 0; i < psd->dacl->num_aces; i++) {
3692                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3693         }
3694
3695         /*
3696          * Note that we're ignoring "inherit permissions" here
3697          * as that really only applies to newly created files. JRA.
3698          */
3699
3700         /* Finally append any inherited ACEs. */
3701         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3702                 struct security_ace *se = &parent_sd->dacl->aces[j];
3703
3704                 if (fsp->is_directory) {
3705                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3706                                 /* Doesn't apply to a directory - ignore. */
3707                                 DEBUG(10,("append_parent_acl: directory %s "
3708                                         "ignoring non container "
3709                                         "inherit flags %u on ACE with sid %s "
3710                                         "from parent %s\n",
3711                                         fsp_str_dbg(fsp),
3712                                         (unsigned int)se->flags,
3713                                         sid_string_dbg(&se->trustee),
3714                                         parent_name));
3715                                 continue;
3716                         }
3717                 } else {
3718                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3719                                 /* Doesn't apply to a file - ignore. */
3720                                 DEBUG(10,("append_parent_acl: file %s "
3721                                         "ignoring non object "
3722                                         "inherit flags %u on ACE with sid %s "
3723                                         "from parent %s\n",
3724                                         fsp_str_dbg(fsp),
3725                                         (unsigned int)se->flags,
3726                                         sid_string_dbg(&se->trustee),
3727                                         parent_name));
3728                                 continue;
3729                         }
3730                 }
3731
3732                 if (is_dacl_protected) {
3733                         /* If the DACL is protected it means we must
3734                          * not overwrite an existing ACE entry with the
3735                          * same SID. This is order N^2. Ouch :-(. JRA. */
3736                         unsigned int k;
3737                         for (k = 0; k < psd->dacl->num_aces; k++) {
3738                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3739                                                 &se->trustee)) {
3740                                         break;
3741                                 }
3742                         }
3743                         if (k < psd->dacl->num_aces) {
3744                                 /* SID matched. Ignore. */
3745                                 DEBUG(10,("append_parent_acl: path %s "
3746                                         "ignoring ACE with protected sid %s "
3747                                         "from parent %s\n",
3748                                         fsp_str_dbg(fsp),
3749                                         sid_string_dbg(&se->trustee),
3750                                         parent_name));
3751                                 continue;
3752                         }
3753                 }
3754
3755                 sec_ace_copy(&new_ace[i], se);
3756                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3757                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3758                 }
3759                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3760
3761                 if (fsp->is_directory) {
3762                         /*
3763                          * Strip off any inherit only. It's applied.
3764                          */
3765                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3766                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3767                                 /* No further inheritance. */
3768                                 new_ace[i].flags &=
3769                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3770                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3771                         }
3772                 } else {
3773                         /*
3774                          * Strip off any container or inherit
3775                          * flags, they can't apply to objects.
3776                          */
3777                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3778                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3779                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3780                 }
3781                 i++;
3782
3783                 DEBUG(10,("append_parent_acl: path %s "
3784                         "inheriting ACE with sid %s "
3785                         "from parent %s\n",
3786                         fsp_str_dbg(fsp),
3787                         sid_string_dbg(&se->trustee),
3788                         parent_name));
3789         }
3790
3791         psd->dacl->aces = new_ace;
3792         psd->dacl->num_aces = i;
3793         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3794                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
3795
3796         *pp_new_sd = psd;
3797         return status;
3798 }
3799 #endif
3800
3801 /****************************************************************************
3802  Reply to set a security descriptor on an fsp. security_info_sent is the
3803  description of the following NT ACL.
3804  This should be the only external function needed for the UNIX style set ACL.
3805  We make a copy of psd_orig as internal functions modify the elements inside
3806  it, even though it's a const pointer.
3807 ****************************************************************************/
3808
3809 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3810 {
3811         connection_struct *conn = fsp->conn;
3812         uid_t user = (uid_t)-1;
3813         gid_t grp = (gid_t)-1;
3814         struct dom_sid file_owner_sid;
3815         struct dom_sid file_grp_sid;
3816         canon_ace *file_ace_list = NULL;
3817         canon_ace *dir_ace_list = NULL;
3818         bool acl_perms = False;
3819         mode_t orig_mode = (mode_t)0;
3820         NTSTATUS status;
3821         bool set_acl_as_root = false;
3822         bool acl_set_support = false;
3823         bool ret = false;
3824         struct security_descriptor *psd = NULL;
3825
3826         DEBUG(10,("set_nt_acl: called for file %s\n",
3827                   fsp_str_dbg(fsp)));
3828
3829         if (!CAN_WRITE(conn)) {
3830                 DEBUG(10,("set acl rejected on read-only share\n"));
3831                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3832         }
3833
3834         if (!psd_orig) {
3835                 return NT_STATUS_INVALID_PARAMETER;
3836         }
3837
3838         psd = dup_sec_desc(talloc_tos(), psd_orig);
3839         if (!psd) {
3840                 return NT_STATUS_NO_MEMORY;
3841         }
3842
3843         /*
3844          * Get the current state of the file.
3845          */
3846
3847         status = vfs_stat_fsp(fsp);
3848         if (!NT_STATUS_IS_OK(status)) {
3849                 return status;
3850         }
3851
3852         /* Save the original element we check against. */
3853         orig_mode = fsp->fsp_name->st.st_ex_mode;
3854
3855         /*
3856          * Unpack the user/group/world id's.
3857          */
3858
3859         /* POSIX can't cope with missing owner/group. */
3860         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3861                 security_info_sent &= ~SECINFO_OWNER;
3862         }
3863         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3864                 security_info_sent &= ~SECINFO_GROUP;
3865         }
3866
3867         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3868         if (!NT_STATUS_IS_OK(status)) {
3869                 return status;
3870         }
3871
3872         /*
3873          * Do we need to chown ? If so this must be done first as the incoming
3874          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3875          * Noticed by Simo.
3876          */
3877
3878         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3879             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3880
3881                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3882                          fsp_str_dbg(fsp), (unsigned int)user,
3883                          (unsigned int)grp));
3884
3885                 status = try_chown(fsp, user, grp);
3886                 if(!NT_STATUS_IS_OK(status)) {
3887                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3888                                 "= %s.\n", fsp_str_dbg(fsp),
3889                                 (unsigned int)user,
3890                                 (unsigned int)grp,
3891                                 nt_errstr(status)));
3892                         return status;
3893                 }
3894
3895                 /*
3896                  * Recheck the current state of the file, which may have changed.
3897                  * (suid/sgid bits, for instance)
3898                  */
3899
3900                 status = vfs_stat_fsp(fsp);
3901                 if (!NT_STATUS_IS_OK(status)) {
3902                         return status;
3903                 }
3904
3905                 /* Save the original element we check against. */
3906                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3907
3908                 /* If we successfully chowned, we know we must
3909                  * be able to set the acl, so do it as root.
3910                  */
3911                 set_acl_as_root = true;
3912         }
3913
3914         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3915
3916         if((security_info_sent & SECINFO_DACL) &&
3917                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3918                         (psd->dacl == NULL)) {
3919                 struct security_ace ace[3];
3920
3921                 /* We can't have NULL DACL in POSIX.
3922                    Use owner/group/Everyone -> full access. */
3923
3924                 init_sec_ace(&ace[0],
3925                                 &file_owner_sid,
3926                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3927                                 GENERIC_ALL_ACCESS,
3928                                 0);
3929                 init_sec_ace(&ace[1],
3930                                 &file_grp_sid,
3931                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3932                                 GENERIC_ALL_ACCESS,
3933                                 0);
3934                 init_sec_ace(&ace[2],
3935                                 &global_sid_World,
3936                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3937                                 GENERIC_ALL_ACCESS,
3938                                 0);
3939                 psd->dacl = make_sec_acl(talloc_tos(),
3940                                         NT4_ACL_REVISION,
3941                                         3,
3942                                         ace);
3943                 if (psd->dacl == NULL) {
3944                         return NT_STATUS_NO_MEMORY;
3945                 }
3946                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3947         }
3948
3949         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3950                                      &file_grp_sid, &file_ace_list,
3951                                      &dir_ace_list, security_info_sent, psd);
3952
3953         /* Ignore W2K traverse DACL set. */
3954         if (!file_ace_list && !dir_ace_list) {
3955                 return NT_STATUS_OK;
3956         }
3957
3958         if (!acl_perms) {
3959                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3960                 free_canon_ace_list(file_ace_list);
3961                 free_canon_ace_list(dir_ace_list);
3962                 return NT_STATUS_ACCESS_DENIED;
3963         }
3964
3965         /*
3966          * Only change security if we got a DACL.
3967          */
3968
3969         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3970                 free_canon_ace_list(file_ace_list);
3971                 free_canon_ace_list(dir_ace_list);
3972                 return NT_STATUS_OK;
3973         }
3974
3975         /*
3976          * Try using the POSIX ACL set first. Fall back to chmod if
3977          * we have no ACL support on this filesystem.
3978          */
3979
3980         if (acl_perms && file_ace_list) {
3981                 if (set_acl_as_root) {
3982                         become_root();
3983                 }
3984                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3985                                          &fsp->fsp_name->st, &acl_set_support);
3986                 if (set_acl_as_root) {
3987                         unbecome_root();
3988                 }
3989                 if (acl_set_support && ret == false) {
3990                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3991                                  "%s (%s).\n", fsp_str_dbg(fsp),
3992                                  strerror(errno)));
3993                         free_canon_ace_list(file_ace_list);
3994                         free_canon_ace_list(dir_ace_list);
3995                         return map_nt_error_from_unix(errno);
3996                 }
3997         }
3998
3999         if (acl_perms && acl_set_support && fsp->is_directory) {
4000                 if (dir_ace_list) {
4001                         if (set_acl_as_root) {
4002                                 become_root();
4003                         }
4004                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
4005                                                  &fsp->fsp_name->st,
4006                                                  &acl_set_support);
4007                         if (set_acl_as_root) {
4008                                 unbecome_root();
4009                         }
4010                         if (ret == false) {
4011                                 DEBUG(3,("set_nt_acl: failed to set default "
4012                                          "acl on directory %s (%s).\n",
4013                                          fsp_str_dbg(fsp), strerror(errno)));
4014                                 free_canon_ace_list(file_ace_list);
4015                                 free_canon_ace_list(dir_ace_list);
4016                                 return map_nt_error_from_unix(errno);
4017                         }
4018                 } else {
4019                         int sret = -1;
4020
4021                         /*
4022                          * No default ACL - delete one if it exists.
4023                          */
4024
4025                         if (set_acl_as_root) {
4026                                 become_root();
4027                         }
4028                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4029                             fsp->fsp_name->base_name);
4030                         if (set_acl_as_root) {
4031                                 unbecome_root();
4032                         }
4033                         if (sret == -1) {
4034                                 if (acl_group_override(conn, fsp->fsp_name)) {
4035                                         DEBUG(5,("set_nt_acl: acl group "
4036                                                  "control on and current user "
4037                                                  "in file %s primary group. "
4038                                                  "Override delete_def_acl\n",
4039                                                  fsp_str_dbg(fsp)));
4040
4041                                         become_root();
4042                                         sret =
4043                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4044                                                     conn,
4045                                                     fsp->fsp_name->base_name);
4046                                         unbecome_root();
4047                                 }
4048
4049                                 if (sret == -1) {
4050                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4051                                         free_canon_ace_list(file_ace_list);
4052                                         free_canon_ace_list(dir_ace_list);
4053                                         return map_nt_error_from_unix(errno);
4054                                 }
4055                         }
4056                 }
4057         }
4058
4059         if (acl_set_support) {
4060                 if (set_acl_as_root) {
4061                         become_root();
4062                 }
4063                 store_inheritance_attributes(fsp,
4064                                 file_ace_list,
4065                                 dir_ace_list,
4066                                 psd->type);
4067                 if (set_acl_as_root) {
4068                         unbecome_root();
4069                 }
4070         }
4071
4072         /*
4073          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4074          */
4075
4076         if(!acl_set_support && acl_perms) {
4077                 mode_t posix_perms;
4078
4079                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4080                         free_canon_ace_list(file_ace_list);
4081                         free_canon_ace_list(dir_ace_list);
4082                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4083                                  "posix permissions for file %s.\n",
4084                                  fsp_str_dbg(fsp)));
4085                         return NT_STATUS_ACCESS_DENIED;
4086                 }
4087
4088                 if (orig_mode != posix_perms) {
4089                         int sret = -1;
4090
4091                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4092                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4093
4094                         if (set_acl_as_root) {
4095                                 become_root();
4096                         }
4097                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4098                                              posix_perms);
4099                         if (set_acl_as_root) {
4100                                 unbecome_root();
4101                         }
4102                         if(sret == -1) {
4103                                 if (acl_group_override(conn, fsp->fsp_name)) {
4104                                         DEBUG(5,("set_nt_acl: acl group "
4105                                                  "control on and current user "
4106                                                  "in file %s primary group. "
4107                                                  "Override chmod\n",
4108                                                  fsp_str_dbg(fsp)));
4109
4110                                         become_root();
4111                                         sret = SMB_VFS_CHMOD(conn,
4112                                             fsp->fsp_name->base_name,
4113                                             posix_perms);
4114                                         unbecome_root();
4115                                 }
4116
4117                                 if (sret == -1) {
4118                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4119                                                  "failed. Error = %s.\n",
4120                                                  fsp_str_dbg(fsp),
4121                                                  (unsigned int)posix_perms,
4122                                                  strerror(errno)));
4123                                         free_canon_ace_list(file_ace_list);
4124                                         free_canon_ace_list(dir_ace_list);
4125                                         return map_nt_error_from_unix(errno);
4126                                 }
4127                         }
4128                 }
4129         }
4130
4131         free_canon_ace_list(file_ace_list);
4132         free_canon_ace_list(dir_ace_list);
4133
4134         /* Ensure the stat struct in the fsp is correct. */
4135         status = vfs_stat_fsp(fsp);
4136
4137         return NT_STATUS_OK;
4138 }
4139
4140 /****************************************************************************
4141  Get the actual group bits stored on a file with an ACL. Has no effect if
4142  the file has no ACL. Needed in dosmode code where the stat() will return
4143  the mask bits, not the real group bits, for a file with an ACL.
4144 ****************************************************************************/
4145
4146 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4147 {
4148         int entry_id = SMB_ACL_FIRST_ENTRY;
4149         SMB_ACL_ENTRY_T entry;
4150         SMB_ACL_T posix_acl;
4151         int result = -1;
4152
4153         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4154         if (posix_acl == (SMB_ACL_T)NULL)
4155                 return -1;
4156
4157         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4158                 SMB_ACL_TAG_T tagtype;
4159                 SMB_ACL_PERMSET_T permset;
4160
4161                 entry_id = SMB_ACL_NEXT_ENTRY;
4162
4163                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4164                         break;
4165
4166                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4167                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4168                                 break;
4169                         } else {
4170                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4171                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4172                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4173                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4174                                 result = 0;
4175                                 break;
4176                         }
4177                 }
4178         }
4179         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4180         return result;
4181 }
4182
4183 /****************************************************************************
4184  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4185  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4186 ****************************************************************************/
4187
4188 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4189 {
4190         int entry_id = SMB_ACL_FIRST_ENTRY;
4191         SMB_ACL_ENTRY_T entry;
4192         int num_entries = 0;
4193
4194         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4195                 SMB_ACL_TAG_T tagtype;
4196                 SMB_ACL_PERMSET_T permset;
4197                 mode_t perms;
4198
4199                 entry_id = SMB_ACL_NEXT_ENTRY;
4200
4201                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4202                         return -1;
4203
4204                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4205                         return -1;
4206
4207                 num_entries++;
4208
4209                 switch(tagtype) {
4210                         case SMB_ACL_USER_OBJ:
4211                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4212                                 break;
4213                         case SMB_ACL_GROUP_OBJ:
4214                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4215                                 break;
4216                         case SMB_ACL_MASK:
4217                                 /*
4218                                  * FIXME: The ACL_MASK entry permissions should really be set to
4219                                  * the union of the permissions of all ACL_USER,
4220                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4221                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4222                                  */
4223                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4224                                 break;
4225                         case SMB_ACL_OTHER:
4226                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4227                                 break;
4228                         default:
4229                                 continue;
4230                 }
4231
4232                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4233                         return -1;
4234
4235                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4236                         return -1;
4237         }
4238
4239         /*
4240          * If this is a simple 3 element ACL or no elements then it's a standard
4241          * UNIX permission set. Just use chmod...
4242          */
4243
4244         if ((num_entries == 3) || (num_entries == 0))
4245                 return -1;
4246
4247         return 0;
4248 }
4249
4250 /****************************************************************************
4251  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4252  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4253  resulting ACL on TO.  Note that name is in UNIX character set.
4254 ****************************************************************************/
4255
4256 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4257 {
4258         SMB_ACL_T posix_acl = NULL;
4259         int ret = -1;
4260
4261         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4262                 return -1;
4263
4264         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4265                 goto done;
4266
4267         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4268
4269  done:
4270
4271         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4272         return ret;
4273 }
4274
4275 /****************************************************************************
4276  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4277  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4278  Note that name is in UNIX character set.
4279 ****************************************************************************/
4280
4281 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4282 {
4283         return copy_access_posix_acl(conn, name, name, mode);
4284 }
4285
4286 /****************************************************************************
4287  Check for an existing default POSIX ACL on a directory.
4288 ****************************************************************************/
4289
4290 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4291 {
4292         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4293         bool has_acl = False;
4294         SMB_ACL_ENTRY_T entry;
4295
4296         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4297                 has_acl = True;
4298         }
4299
4300         if (def_acl) {
4301                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4302         }
4303         return has_acl;
4304 }
4305
4306 /****************************************************************************
4307  If the parent directory has no default ACL but it does have an Access ACL,
4308  inherit this Access ACL to file name.
4309 ****************************************************************************/
4310
4311 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4312                        const char *name, mode_t mode)
4313 {
4314         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4315                 return 0;
4316
4317         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4318 }
4319
4320 /****************************************************************************
4321  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4322  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4323 ****************************************************************************/
4324
4325 int fchmod_acl(files_struct *fsp, mode_t mode)
4326 {
4327         connection_struct *conn = fsp->conn;
4328         SMB_ACL_T posix_acl = NULL;
4329         int ret = -1;
4330
4331         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4332                 return -1;
4333
4334         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4335                 goto done;
4336
4337         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4338
4339   done:
4340
4341         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4342         return ret;
4343 }
4344
4345 /****************************************************************************
4346  Map from wire type to permset.
4347 ****************************************************************************/
4348
4349 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4350 {
4351         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4352                 return False;
4353         }
4354
4355         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4356                 return False;
4357         }
4358
4359         if (wire_perm & SMB_POSIX_ACL_READ) {
4360                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4361                         return False;
4362                 }
4363         }
4364         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4365                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4366                         return False;
4367                 }
4368         }
4369         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4370                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4371                         return False;
4372                 }
4373         }
4374         return True;
4375 }
4376
4377 /****************************************************************************
4378  Map from wire type to tagtype.
4379 ****************************************************************************/
4380
4381 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4382 {
4383         switch (wire_tt) {
4384                 case SMB_POSIX_ACL_USER_OBJ:
4385                         *p_tt = SMB_ACL_USER_OBJ;
4386                         break;
4387                 case SMB_POSIX_ACL_USER:
4388                         *p_tt = SMB_ACL_USER;
4389                         break;
4390                 case SMB_POSIX_ACL_GROUP_OBJ:
4391                         *p_tt = SMB_ACL_GROUP_OBJ;
4392                         break;
4393                 case SMB_POSIX_ACL_GROUP:
4394                         *p_tt = SMB_ACL_GROUP;
4395                         break;
4396                 case SMB_POSIX_ACL_MASK:
4397                         *p_tt = SMB_ACL_MASK;
4398                         break;
4399                 case SMB_POSIX_ACL_OTHER:
4400                         *p_tt = SMB_ACL_OTHER;
4401                         break;
4402                 default:
4403                         return False;
4404         }
4405         return True;
4406 }
4407
4408 /****************************************************************************
4409  Create a new POSIX acl from wire permissions.
4410  FIXME ! How does the share mask/mode fit into this.... ?
4411 ****************************************************************************/
4412
4413 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4414 {
4415         unsigned int i;
4416         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4417
4418         if (the_acl == NULL) {
4419                 return NULL;
4420         }
4421
4422         for (i = 0; i < num_acls; i++) {
4423                 SMB_ACL_ENTRY_T the_entry;
4424                 SMB_ACL_PERMSET_T the_permset;
4425                 SMB_ACL_TAG_T tag_type;
4426
4427                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4428                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4429                                 i, strerror(errno) ));
4430                         goto fail;
4431                 }
4432
4433                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4434                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4435                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4436                         goto fail;
4437                 }
4438
4439                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4440                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4441                                 i, strerror(errno) ));
4442                         goto fail;
4443                 }
4444
4445                 /* Get the permset pointer from the new ACL entry. */
4446                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4447                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4448                                 i, strerror(errno) ));
4449                         goto fail;
4450                 }
4451
4452                 /* Map from wire to permissions. */
4453                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4454                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4455                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4456                         goto fail;
4457                 }
4458
4459                 /* Now apply to the new ACL entry. */
4460                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4461                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4462                                 i, strerror(errno) ));
4463                         goto fail;
4464                 }
4465
4466                 if (tag_type == SMB_ACL_USER) {
4467                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4468                         uid_t uid = (uid_t)uidval;
4469                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4470                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4471                                         (unsigned int)uid, i, strerror(errno) ));
4472                                 goto fail;
4473                         }
4474                 }
4475
4476                 if (tag_type == SMB_ACL_GROUP) {
4477                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4478                         gid_t gid = (uid_t)gidval;
4479                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4480                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4481                                         (unsigned int)gid, i, strerror(errno) ));
4482                                 goto fail;
4483                         }
4484                 }
4485         }
4486
4487         return the_acl;
4488
4489  fail:
4490
4491         if (the_acl != NULL) {
4492                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4493         }
4494         return NULL;
4495 }
4496
4497 /****************************************************************************
4498  Calls from UNIX extensions - Default POSIX ACL set.
4499  If num_def_acls == 0 and not a directory just return. If it is a directory
4500  and num_def_acls == 0 then remove the default acl. Else set the default acl
4501  on the directory.
4502 ****************************************************************************/
4503
4504 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4505                                 uint16 num_def_acls, const char *pdata)
4506 {
4507         SMB_ACL_T def_acl = NULL;
4508
4509         if (!S_ISDIR(psbuf->st_ex_mode)) {
4510                 if (num_def_acls) {
4511                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4512                         errno = EISDIR;
4513                         return False;
4514                 } else {
4515                         return True;
4516                 }
4517         }
4518
4519         if (!num_def_acls) {
4520                 /* Remove the default ACL. */
4521                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4522                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4523                                 fname, strerror(errno) ));
4524                         return False;
4525                 }
4526                 return True;
4527         }
4528
4529         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4530                 return False;
4531         }
4532
4533         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4534                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4535                         fname, strerror(errno) ));
4536                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4537                 return False;
4538         }
4539
4540         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4541         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4542         return True;
4543 }
4544
4545 /****************************************************************************
4546  Remove an ACL from a file. As we don't have acl_delete_entry() available
4547  we must read the current acl and copy all entries except MASK, USER and GROUP
4548  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4549  removed.
4550  FIXME ! How does the share mask/mode fit into this.... ?
4551 ****************************************************************************/
4552
4553 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4554 {
4555         SMB_ACL_T file_acl = NULL;
4556         int entry_id = SMB_ACL_FIRST_ENTRY;
4557         SMB_ACL_ENTRY_T entry;
4558         bool ret = False;
4559         /* Create a new ACL with only 3 entries, u/g/w. */
4560         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4561         SMB_ACL_ENTRY_T user_ent = NULL;
4562         SMB_ACL_ENTRY_T group_ent = NULL;
4563         SMB_ACL_ENTRY_T other_ent = NULL;
4564
4565         if (new_file_acl == NULL) {
4566                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4567                 return False;
4568         }
4569
4570         /* Now create the u/g/w entries. */
4571         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4572                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4573                         fname, strerror(errno) ));
4574                 goto done;
4575         }
4576         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4577                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4578                         fname, strerror(errno) ));
4579                 goto done;
4580         }
4581
4582         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4583                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4584                         fname, strerror(errno) ));
4585                 goto done;
4586         }
4587         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4588                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4589                         fname, strerror(errno) ));
4590                 goto done;
4591         }
4592
4593         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4594                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4595                         fname, strerror(errno) ));
4596                 goto done;
4597         }
4598         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4599                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4600                         fname, strerror(errno) ));
4601                 goto done;
4602         }
4603
4604         /* Get the current file ACL. */
4605         if (fsp && fsp->fh->fd != -1) {
4606                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4607         } else {
4608                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4609         }
4610
4611         if (file_acl == NULL) {
4612                 /* This is only returned if an error occurred. Even for a file with
4613                    no acl a u/g/w acl should be returned. */
4614                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4615                         fname, strerror(errno) ));
4616                 goto done;
4617         }
4618
4619         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4620                 SMB_ACL_TAG_T tagtype;
4621                 SMB_ACL_PERMSET_T permset;
4622
4623                 entry_id = SMB_ACL_NEXT_ENTRY;
4624
4625                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4626                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4627                                 fname, strerror(errno) ));
4628                         goto done;
4629                 }
4630
4631                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4632                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4633                                 fname, strerror(errno) ));
4634                         goto done;
4635                 }
4636
4637                 if (tagtype == SMB_ACL_USER_OBJ) {
4638                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4639                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4640                                         fname, strerror(errno) ));
4641                         }
4642                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4643                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4644                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4645                                         fname, strerror(errno) ));
4646                         }
4647                 } else if (tagtype == SMB_ACL_OTHER) {
4648                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4649                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4650                                         fname, strerror(errno) ));
4651                         }
4652                 }
4653         }
4654
4655         /* Set the new empty file ACL. */
4656         if (fsp && fsp->fh->fd != -1) {
4657                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4658                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4659                                 fname, strerror(errno) ));
4660                         goto done;
4661                 }
4662         } else {
4663                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4664                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4665                                 fname, strerror(errno) ));
4666                         goto done;
4667                 }
4668         }
4669
4670         ret = True;
4671
4672  done:
4673
4674         if (file_acl) {
4675                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4676         }
4677         if (new_file_acl) {
4678                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4679         }
4680         return ret;
4681 }
4682
4683 /****************************************************************************
4684  Calls from UNIX extensions - POSIX ACL set.
4685  If num_def_acls == 0 then read/modify/write acl after removing all entries
4686  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4687 ****************************************************************************/
4688
4689 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4690 {
4691         SMB_ACL_T file_acl = NULL;
4692
4693         if (!num_acls) {
4694                 /* Remove the ACL from the file. */
4695                 return remove_posix_acl(conn, fsp, fname);
4696         }
4697
4698         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4699                 return False;
4700         }
4701
4702         if (fsp && fsp->fh->fd != -1) {
4703                 /* The preferred way - use an open fd. */
4704                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4705                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4706                                 fname, strerror(errno) ));
4707                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4708                         return False;
4709                 }
4710         } else {
4711                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4712                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4713                                 fname, strerror(errno) ));
4714                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4715                         return False;
4716                 }
4717         }
4718
4719         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4720         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4721         return True;
4722 }
4723
4724 /********************************************************************
4725  Pull the NT ACL from a file on disk or the OpenEventlog() access
4726  check.  Caller is responsible for freeing the returned security
4727  descriptor via TALLOC_FREE().  This is designed for dealing with
4728  user space access checks in smbd outside of the VFS.  For example,
4729  checking access rights in OpenEventlog().
4730
4731  Assume we are dealing with files (for now)
4732 ********************************************************************/
4733
4734 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4735 {
4736         struct security_descriptor *psd, *ret_sd;
4737         connection_struct *conn;
4738         files_struct finfo;
4739         struct fd_handle fh;
4740         NTSTATUS status;
4741
4742         conn = TALLOC_ZERO_P(ctx, connection_struct);
4743         if (conn == NULL) {
4744                 DEBUG(0, ("talloc failed\n"));
4745                 return NULL;
4746         }
4747
4748         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4749                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4750                 TALLOC_FREE(conn);
4751                 return NULL;
4752         }
4753
4754         conn->params->service = -1;
4755
4756         set_conn_connectpath(conn, "/");
4757
4758         if (!smbd_vfs_init(conn)) {
4759                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4760                 conn_free(conn);
4761                 return NULL;
4762         }
4763
4764         ZERO_STRUCT( finfo );
4765         ZERO_STRUCT( fh );
4766
4767         finfo.fnum = -1;
4768         finfo.conn = conn;
4769         finfo.fh = &fh;
4770         finfo.fh->fd = -1;
4771
4772         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4773                                             &finfo.fsp_name);
4774         if (!NT_STATUS_IS_OK(status)) {
4775                 conn_free(conn);
4776                 return NULL;
4777         }
4778
4779         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4780                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4781                 TALLOC_FREE(finfo.fsp_name);
4782                 conn_free(conn);
4783                 return NULL;
4784         }
4785
4786         ret_sd = dup_sec_desc( ctx, psd );
4787
4788         TALLOC_FREE(finfo.fsp_name);
4789         conn_free(conn);
4790
4791         return ret_sd;
4792 }
4793
4794 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4795
4796 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4797                                         const char *name,
4798                                         SMB_STRUCT_STAT *psbuf,
4799                                         struct security_descriptor **ppdesc)
4800 {
4801         struct dom_sid owner_sid, group_sid;
4802         size_t size = 0;
4803         struct security_ace aces[4];
4804         uint32_t access_mask = 0;
4805         mode_t mode = psbuf->st_ex_mode;
4806         struct security_acl *new_dacl = NULL;
4807         int idx = 0;
4808
4809         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4810                 name, (int)mode ));
4811
4812         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4813         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4814
4815         /*
4816          We provide up to 4 ACEs
4817                 - Owner
4818                 - Group
4819                 - Everyone
4820                 - NT System
4821         */
4822
4823         if (mode & S_IRUSR) {
4824                 if (mode & S_IWUSR) {
4825                         access_mask |= SEC_RIGHTS_FILE_ALL;
4826                 } else {
4827                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4828                 }
4829         }
4830         if (mode & S_IWUSR) {
4831                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4832         }
4833
4834         init_sec_ace(&aces[idx],
4835                         &owner_sid,
4836                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4837                         access_mask,
4838                         0);
4839         idx++;
4840
4841         access_mask = 0;
4842         if (mode & S_IRGRP) {
4843                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4844         }
4845         if (mode & S_IWGRP) {
4846                 /* note that delete is not granted - this matches posix behaviour */
4847                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4848         }
4849         if (access_mask) {
4850                 init_sec_ace(&aces[idx],
4851                         &group_sid,
4852                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4853                         access_mask,
4854                         0);
4855                 idx++;
4856         }
4857
4858         access_mask = 0;
4859         if (mode & S_IROTH) {
4860                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4861         }
4862         if (mode & S_IWOTH) {
4863                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4864         }
4865         if (access_mask) {
4866                 init_sec_ace(&aces[idx],
4867                         &global_sid_World,
4868                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4869                         access_mask,
4870                         0);
4871                 idx++;
4872         }
4873
4874         init_sec_ace(&aces[idx],
4875                         &global_sid_System,
4876                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4877                         SEC_RIGHTS_FILE_ALL,
4878                         0);
4879         idx++;
4880
4881         new_dacl = make_sec_acl(ctx,
4882                         NT4_ACL_REVISION,
4883                         idx,
4884                         aces);
4885
4886         if (!new_dacl) {
4887                 return NT_STATUS_NO_MEMORY;
4888         }
4889
4890         *ppdesc = make_sec_desc(ctx,
4891                         SECURITY_DESCRIPTOR_REVISION_1,
4892                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4893                         &owner_sid,
4894                         &group_sid,
4895                         NULL,
4896                         new_dacl,
4897                         &size);
4898         if (!*ppdesc) {
4899                 return NT_STATUS_NO_MEMORY;
4900         }
4901         return NT_STATUS_OK;
4902 }