source3/smbd/posix_acls.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB NT Security Descriptor / Unix permission conversion.
   4    Copyright (C) Jeremy Allison 1994-2009.
   5    Copyright (C) Andreas Gruenbacher 2002.
   6    Copyright (C) Simo Sorce <idra@samba.org> 2009.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "smbd/smbd.h"
  24 #include "system/filesys.h"
  25 #include "../libcli/security/security.h"
  26 #include "trans2.h"
  27 #include "passdb/lookup_sid.h"
  28 #include "auth.h"
  29
  30 extern const struct generic_mapping file_generic_mapping;
  31
  32 #undef  DBGC_CLASS
  33 #define DBGC_CLASS DBGC_ACLS
  34
  35 /****************************************************************************
  36  Data structures representing the internal ACE format.
  37 ****************************************************************************/
  38
  39 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  40 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  41
  42 typedef union posix_id {
  43                 uid_t uid;
  44                 gid_t gid;
  45                 int world;
  46 } posix_id;
  47
  48 typedef struct canon_ace {
  49         struct canon_ace *next, *prev;
  50         SMB_ACL_TAG_T type;
  51         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  52         struct dom_sid trustee;
  53         enum ace_owner owner_type;
  54         enum ace_attribute attr;
  55         posix_id unix_ug;
  56         uint8_t ace_flags; /* From windows ACE entry. */
  57 } canon_ace;
  58
  59 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  60
  61 /*
  62  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  63  * attribute on disk - version 1.
  64  * All values are little endian.
  65  *
  66  * |  1   |  1   |   2         |         2           |  ....
  67  * +------+------+-------------+---------------------+-------------+--------------------+
  68  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  69  * +------+------+-------------+---------------------+-------------+--------------------+
  70  *
  71  * Entry format is :
  72  *
  73  * |  1   |       4           |
  74  * +------+-------------------+
  75  * | value|  uid/gid or world |
  76  * | type |  value            |
  77  * +------+-------------------+
  78  *
  79  * Version 2 format. Stores extra Windows metadata about an ACL.
  80  *
  81  * |  1   |  2       |   2         |         2           |  ....
  82  * +------+----------+-------------+---------------------+-------------+--------------------+
  83  * | vers | ace      | num_entries | num_default_entries | ..entries.. | default_entries... |
  84  * |   2  |  type    |             |                     |             |                    |
  85  * +------+----------+-------------+---------------------+-------------+--------------------+
  86  *
  87  * Entry format is :
  88  *
  89  * |  1   |  1   |       4           |
  90  * +------+------+-------------------+
  91  * | ace  | value|  uid/gid or world |
  92  * | flag | type |  value            |
  93  * +------+-------------------+------+
  94  *
  95  */
  96
  97 #define PAI_VERSION_OFFSET                      0
  98
  99 #define PAI_V1_FLAG_OFFSET                      1
 100 #define PAI_V1_NUM_ENTRIES_OFFSET               2
 101 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET       4
 102 #define PAI_V1_ENTRIES_BASE                     6
 103 #define PAI_V1_ACL_FLAG_PROTECTED               0x1
 104 #define PAI_V1_ENTRY_LENGTH                     5
 105
 106 #define PAI_V1_VERSION                          1
 107
 108 #define PAI_V2_TYPE_OFFSET                      1
 109 #define PAI_V2_NUM_ENTRIES_OFFSET               3
 110 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET       5
 111 #define PAI_V2_ENTRIES_BASE                     7
 112 #define PAI_V2_ENTRY_LENGTH                     6
 113
 114 #define PAI_V2_VERSION                          2
 115
 116 /*
 117  * In memory format of user.SAMBA_PAI attribute.
 118  */
 119
 120 struct pai_entry {
 121         struct pai_entry *next, *prev;
 122         uint8_t ace_flags;
 123         enum ace_owner owner_type;
 124         posix_id unix_ug;
 125 };
 126
 127 struct pai_val {
 128         uint16_t sd_type;
 129         unsigned int num_entries;
 130         struct pai_entry *entry_list;
 131         unsigned int num_def_entries;
 132         struct pai_entry *def_entry_list;
 133 };
 134
 135 /************************************************************************
 136  Return a uint32 of the pai_entry principal.
 137 ************************************************************************/
 138
 139 static uint32_t get_pai_entry_val(struct pai_entry *paie)
 140 {
 141         switch (paie->owner_type) {
 142                 case UID_ACE:
 143                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 144                         return (uint32_t)paie->unix_ug.uid;
 145                 case GID_ACE:
 146                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 147                         return (uint32_t)paie->unix_ug.gid;
 148                 case WORLD_ACE:
 149                 default:
 150                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 151                         return (uint32_t)-1;
 152         }
 153 }
 154
 155 /************************************************************************
 156  Return a uint32 of the entry principal.
 157 ************************************************************************/
 158
 159 static uint32_t get_entry_val(canon_ace *ace_entry)
 160 {
 161         switch (ace_entry->owner_type) {
 162                 case UID_ACE:
 163                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
 164                         return (uint32_t)ace_entry->unix_ug.uid;
 165                 case GID_ACE:
 166                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
 167                         return (uint32_t)ace_entry->unix_ug.gid;
 168                 case WORLD_ACE:
 169                 default:
 170                         DEBUG(10,("get_entry_val: world ace\n"));
 171                         return (uint32_t)-1;
 172         }
 173 }
 174
 175 /************************************************************************
 176  Create the on-disk format (always v2 now). Caller must free.
 177 ************************************************************************/
 178
 179 static char *create_pai_buf_v2(canon_ace *file_ace_list,
 180                                 canon_ace *dir_ace_list,
 181                                 uint16_t sd_type,
 182                                 size_t *store_size)
 183 {
 184         char *pai_buf = NULL;
 185         canon_ace *ace_list = NULL;
 186         char *entry_offset = NULL;
 187         unsigned int num_entries = 0;
 188         unsigned int num_def_entries = 0;
 189         unsigned int i;
 190
 191         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 192                 num_entries++;
 193         }
 194
 195         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 196                 num_def_entries++;
 197         }
 198
 199         DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 200
 201         *store_size = PAI_V2_ENTRIES_BASE +
 202                 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
 203
 204         pai_buf = talloc_array(talloc_tos(), char, *store_size);
 205         if (!pai_buf) {
 206                 return NULL;
 207         }
 208
 209         /* Set up the header. */
 210         memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
 211         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
 212         SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
 213         SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
 214         SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 215
 216         DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
 217                         (unsigned int)sd_type ));
 218
 219         entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
 220
 221         i = 0;
 222         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 223                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 224                 uint32_t entry_val = get_entry_val(ace_list);
 225
 226                 SCVAL(entry_offset,0,ace_list->ace_flags);
 227                 SCVAL(entry_offset,1,type_val);
 228                 SIVAL(entry_offset,2,entry_val);
 229                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 230                         i,
 231                         (unsigned int)ace_list->ace_flags,
 232                         (unsigned int)type_val,
 233                         (unsigned int)entry_val ));
 234                 i++;
 235                 entry_offset += PAI_V2_ENTRY_LENGTH;
 236         }
 237
 238         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 239                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 240                 uint32_t entry_val = get_entry_val(ace_list);
 241
 242                 SCVAL(entry_offset,0,ace_list->ace_flags);
 243                 SCVAL(entry_offset,1,type_val);
 244                 SIVAL(entry_offset,2,entry_val);
 245                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 246                         i,
 247                         (unsigned int)ace_list->ace_flags,
 248                         (unsigned int)type_val,
 249                         (unsigned int)entry_val ));
 250                 i++;
 251                 entry_offset += PAI_V2_ENTRY_LENGTH;
 252         }
 253
 254         return pai_buf;
 255 }
 256
 257 /************************************************************************
 258  Store the user.SAMBA_PAI attribute on disk.
 259 ************************************************************************/
 260
 261 static void store_inheritance_attributes(files_struct *fsp,
 262                                         canon_ace *file_ace_list,
 263                                         canon_ace *dir_ace_list,
 264                                         uint16_t sd_type)
 265 {
 266         int ret;
 267         size_t store_size;
 268         char *pai_buf;
 269
 270         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 271                 return;
 272         }
 273
 274         pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
 275                                 sd_type, &store_size);
 276
 277         if (fsp->fh->fd != -1) {
 278                 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 279                                 pai_buf, store_size, 0);
 280         } else {
 281                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
 282                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 283                                        pai_buf, store_size, 0);
 284         }
 285
 286         TALLOC_FREE(pai_buf);
 287
 288         DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
 289                 (unsigned int)sd_type,
 290                 fsp_str_dbg(fsp)));
 291
 292         if (ret == -1 && !no_acl_syscall_error(errno)) {
 293                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 294         }
 295 }
 296
 297 /************************************************************************
 298  Delete the in memory inheritance info.
 299 ************************************************************************/
 300
 301 static void free_inherited_info(struct pai_val *pal)
 302 {
 303         if (pal) {
 304                 struct pai_entry *paie, *paie_next;
 305                 for (paie = pal->entry_list; paie; paie = paie_next) {
 306                         paie_next = paie->next;
 307                         TALLOC_FREE(paie);
 308                 }
 309                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 310                         paie_next = paie->next;
 311                         TALLOC_FREE(paie);
 312                 }
 313                 TALLOC_FREE(pal);
 314         }
 315 }
 316
 317 /************************************************************************
 318  Get any stored ACE flags.
 319 ************************************************************************/
 320
 321 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
 322 {
 323         struct pai_entry *paie;
 324
 325         if (!pal) {
 326                 return 0;
 327         }
 328
 329         /* If the entry exists it is inherited. */
 330         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 331                 if (ace_entry->owner_type == paie->owner_type &&
 332                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 333                         return paie->ace_flags;
 334         }
 335         return 0;
 336 }
 337
 338 /************************************************************************
 339  Ensure an attribute just read is valid - v1.
 340 ************************************************************************/
 341
 342 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
 343 {
 344         uint16 num_entries;
 345         uint16 num_def_entries;
 346
 347         if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
 348                 /* Corrupted - too small. */
 349                 return false;
 350         }
 351
 352         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
 353                 return false;
 354         }
 355
 356         num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
 357         num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 358
 359         /* Check the entry lists match. */
 360         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 361
 362         if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
 363                         PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
 364                 return false;
 365         }
 366
 367         return true;
 368 }
 369
 370 /************************************************************************
 371  Ensure an attribute just read is valid - v2.
 372 ************************************************************************/
 373
 374 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
 375 {
 376         uint16 num_entries;
 377         uint16 num_def_entries;
 378
 379         if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
 380                 /* Corrupted - too small. */
 381                 return false;
 382         }
 383
 384         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
 385                 return false;
 386         }
 387
 388         num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
 389         num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 390
 391         /* Check the entry lists match. */
 392         /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
 393
 394         if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
 395                         PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
 396                 return false;
 397         }
 398
 399         return true;
 400 }
 401
 402 /************************************************************************
 403  Decode the owner.
 404 ************************************************************************/
 405
 406 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
 407 {
 408         paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 409         switch( paie->owner_type) {
 410                 case UID_ACE:
 411                         paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 412                         DEBUG(10,("get_pai_owner_type: uid = %u\n",
 413                                 (unsigned int)paie->unix_ug.uid ));
 414                         break;
 415                 case GID_ACE:
 416                         paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 417                         DEBUG(10,("get_pai_owner_type: gid = %u\n",
 418                                 (unsigned int)paie->unix_ug.gid ));
 419                         break;
 420                 case WORLD_ACE:
 421                         paie->unix_ug.world = -1;
 422                         DEBUG(10,("get_pai_owner_type: world ace\n"));
 423                         break;
 424                 default:
 425                         DEBUG(10,("get_pai_owner_type: unknown type %u\n",
 426                                 (unsigned int)paie->owner_type ));
 427                         return false;
 428         }
 429         return true;
 430 }
 431
 432 /************************************************************************
 433  Process v2 entries.
 434 ************************************************************************/
 435
 436 static const char *create_pai_v1_entries(struct pai_val *paiv,
 437                                 const char *entry_offset,
 438                                 bool def_entry)
 439 {
 440         int i;
 441
 442         for (i = 0; i < paiv->num_entries; i++) {
 443                 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
 444                 if (!paie) {
 445                         return NULL;
 446                 }
 447
 448                 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
 449                 if (!get_pai_owner_type(paie, entry_offset)) {
 450                         TALLOC_FREE(paie);
 451                         return NULL;
 452                 }
 453
 454                 if (!def_entry) {
 455                         DLIST_ADD(paiv->entry_list, paie);
 456                 } else {
 457                         DLIST_ADD(paiv->def_entry_list, paie);
 458                 }
 459                 entry_offset += PAI_V1_ENTRY_LENGTH;
 460         }
 461         return entry_offset;
 462 }
 463
 464 /************************************************************************
 465  Convert to in-memory format from version 1.
 466 ************************************************************************/
 467
 468 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
 469 {
 470         const char *entry_offset;
 471         struct pai_val *paiv = NULL;
 472
 473         if (!check_pai_ok_v1(buf, size)) {
 474                 return NULL;
 475         }
 476
 477         paiv = talloc(talloc_tos(), struct pai_val);
 478         if (!paiv) {
 479                 return NULL;
 480         }
 481
 482         memset(paiv, '\0', sizeof(struct pai_val));
 483
 484         paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
 485                         SEC_DESC_DACL_PROTECTED : 0;
 486
 487         paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
 488         paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 489
 490         entry_offset = buf + PAI_V1_ENTRIES_BASE;
 491
 492         DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
 493                         paiv->num_entries, paiv->num_def_entries ));
 494
 495         entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
 496         if (entry_offset == NULL) {
 497                 free_inherited_info(paiv);
 498                 return NULL;
 499         }
 500         entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
 501         if (entry_offset == NULL) {
 502                 free_inherited_info(paiv);
 503                 return NULL;
 504         }
 505
 506         return paiv;
 507 }
 508
 509 /************************************************************************
 510  Process v2 entries.
 511 ************************************************************************/
 512
 513 static const char *create_pai_v2_entries(struct pai_val *paiv,
 514                                 unsigned int num_entries,
 515                                 const char *entry_offset,
 516                                 bool def_entry)
 517 {
 518         unsigned int i;
 519
 520         for (i = 0; i < num_entries; i++) {
 521                 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
 522                 if (!paie) {
 523                         return NULL;
 524                 }
 525
 526                 paie->ace_flags = CVAL(entry_offset,0);
 527
 528                 if (!get_pai_owner_type(paie, entry_offset+1)) {
 529                         TALLOC_FREE(paie);
 530                         return NULL;
 531                 }
 532                 if (!def_entry) {
 533                         DLIST_ADD(paiv->entry_list, paie);
 534                 } else {
 535                         DLIST_ADD(paiv->def_entry_list, paie);
 536                 }
 537                 entry_offset += PAI_V2_ENTRY_LENGTH;
 538         }
 539         return entry_offset;
 540 }
 541
 542 /************************************************************************
 543  Convert to in-memory format from version 2.
 544 ************************************************************************/
 545
 546 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
 547 {
 548         const char *entry_offset;
 549         struct pai_val *paiv = NULL;
 550
 551         if (!check_pai_ok_v2(buf, size)) {
 552                 return NULL;
 553         }
 554
 555         paiv = talloc(talloc_tos(), struct pai_val);
 556         if (!paiv) {
 557                 return NULL;
 558         }
 559
 560         memset(paiv, '\0', sizeof(struct pai_val));
 561
 562         paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
 563
 564         paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
 565         paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 566
 567         entry_offset = buf + PAI_V2_ENTRIES_BASE;
 568
 569         DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
 570                         (unsigned int)paiv->sd_type,
 571                         paiv->num_entries, paiv->num_def_entries ));
 572
 573         entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
 574                                 entry_offset, false);
 575         if (entry_offset == NULL) {
 576                 free_inherited_info(paiv);
 577                 return NULL;
 578         }
 579         entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
 580                                 entry_offset, true);
 581         if (entry_offset == NULL) {
 582                 free_inherited_info(paiv);
 583                 return NULL;
 584         }
 585
 586         return paiv;
 587 }
 588
 589 /************************************************************************
 590  Convert to in-memory format - from either version 1 or 2.
 591 ************************************************************************/
 592
 593 static struct pai_val *create_pai_val(const char *buf, size_t size)
 594 {
 595         if (size < 1) {
 596                 return NULL;
 597         }
 598         if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
 599                 return create_pai_val_v1(buf, size);
 600         } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
 601                 return create_pai_val_v2(buf, size);
 602         } else {
 603                 return NULL;
 604         }
 605 }
 606
 607 /************************************************************************
 608  Load the user.SAMBA_PAI attribute.
 609 ************************************************************************/
 610
 611 static struct pai_val *fload_inherited_info(files_struct *fsp)
 612 {
 613         char *pai_buf;
 614         size_t pai_buf_size = 1024;
 615         struct pai_val *paiv = NULL;
 616         ssize_t ret;
 617
 618         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 619                 return NULL;
 620         }
 621
 622         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
 623                 return NULL;
 624         }
 625
 626         do {
 627                 if (fsp->fh->fd != -1) {
 628                         ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 629                                         pai_buf, pai_buf_size);
 630                 } else {
 631                         ret = SMB_VFS_GETXATTR(fsp->conn,
 632                                                fsp->fsp_name->base_name,
 633                                                SAMBA_POSIX_INHERITANCE_EA_NAME,
 634                                                pai_buf, pai_buf_size);
 635                 }
 636
 637                 if (ret == -1) {
 638                         if (errno != ERANGE) {
 639                                 break;
 640                         }
 641                         /* Buffer too small - enlarge it. */
 642                         pai_buf_size *= 2;
 643                         TALLOC_FREE(pai_buf);
 644                         if (pai_buf_size > 1024*1024) {
 645                                 return NULL; /* Limit malloc to 1mb. */
 646                         }
 647                         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
 648                                 return NULL;
 649                 }
 650         } while (ret == -1);
 651
 652         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
 653                   (unsigned long)ret, fsp_str_dbg(fsp)));
 654
 655         if (ret == -1) {
 656                 /* No attribute or not supported. */
 657 #if defined(ENOATTR)
 658                 if (errno != ENOATTR)
 659                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 660 #else
 661                 if (errno != ENOSYS)
 662                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 663 #endif
 664                 TALLOC_FREE(pai_buf);
 665                 return NULL;
 666         }
 667
 668         paiv = create_pai_val(pai_buf, ret);
 669
 670         if (paiv) {
 671                 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
 672                           (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
 673         }
 674
 675         TALLOC_FREE(pai_buf);
 676         return paiv;
 677 }
 678
 679 /************************************************************************
 680  Load the user.SAMBA_PAI attribute.
 681 ************************************************************************/
 682
 683 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
 684                                            const char *fname)
 685 {
 686         char *pai_buf;
 687         size_t pai_buf_size = 1024;
 688         struct pai_val *paiv = NULL;
 689         ssize_t ret;
 690
 691         if (!lp_map_acl_inherit(SNUM(conn))) {
 692                 return NULL;
 693         }
 694
 695         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
 696                 return NULL;
 697         }
 698
 699         do {
 700                 ret = SMB_VFS_GETXATTR(conn, fname,
 701                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 702                                        pai_buf, pai_buf_size);
 703
 704                 if (ret == -1) {
 705                         if (errno != ERANGE) {
 706                                 break;
 707                         }
 708                         /* Buffer too small - enlarge it. */
 709                         pai_buf_size *= 2;
 710                         TALLOC_FREE(pai_buf);
 711                         if (pai_buf_size > 1024*1024) {
 712                                 return NULL; /* Limit malloc to 1mb. */
 713                         }
 714                         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
 715                                 return NULL;
 716                 }
 717         } while (ret == -1);
 718
 719         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
 720
 721         if (ret == -1) {
 722                 /* No attribute or not supported. */
 723 #if defined(ENOATTR)
 724                 if (errno != ENOATTR)
 725                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 726 #else
 727                 if (errno != ENOSYS)
 728                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 729 #endif
 730                 TALLOC_FREE(pai_buf);
 731                 return NULL;
 732         }
 733
 734         paiv = create_pai_val(pai_buf, ret);
 735
 736         if (paiv) {
 737                 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
 738                         (unsigned int)paiv->sd_type,
 739                         fname));
 740         }
 741
 742         TALLOC_FREE(pai_buf);
 743         return paiv;
 744 }
 745
 746 /****************************************************************************
 747  Functions to manipulate the internal ACE format.
 748 ****************************************************************************/
 749
 750 /****************************************************************************
 751  Count a linked list of canonical ACE entries.
 752 ****************************************************************************/
 753
 754 static size_t count_canon_ace_list( canon_ace *l_head )
 755 {
 756         size_t count = 0;
 757         canon_ace *ace;
 758
 759         for (ace = l_head; ace; ace = ace->next)
 760                 count++;
 761
 762         return count;
 763 }
 764
 765 /****************************************************************************
 766  Free a linked list of canonical ACE entries.
 767 ****************************************************************************/
 768
 769 static void free_canon_ace_list( canon_ace *l_head )
 770 {
 771         canon_ace *list, *next;
 772
 773         for (list = l_head; list; list = next) {
 774                 next = list->next;
 775                 DLIST_REMOVE(l_head, list);
 776                 TALLOC_FREE(list);
 777         }
 778 }
 779
 780 /****************************************************************************
 781  Function to duplicate a canon_ace entry.
 782 ****************************************************************************/
 783
 784 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 785 {
 786         canon_ace *dst_ace = talloc(talloc_tos(), canon_ace);
 787
 788         if (dst_ace == NULL)
 789                 return NULL;
 790
 791         *dst_ace = *src_ace;
 792         dst_ace->prev = dst_ace->next = NULL;
 793         return dst_ace;
 794 }
 795
 796 /****************************************************************************
 797  Print out a canon ace.
 798 ****************************************************************************/
 799
 800 static void print_canon_ace(canon_ace *pace, int num)
 801 {
 802         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 803         dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
 804         if (pace->owner_type == UID_ACE) {
 805                 const char *u_name = uidtoname(pace->unix_ug.uid);
 806                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
 807         } else if (pace->owner_type == GID_ACE) {
 808                 char *g_name = gidtoname(pace->unix_ug.gid);
 809                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
 810         } else
 811                 dbgtext( "other ");
 812         switch (pace->type) {
 813                 case SMB_ACL_USER:
 814                         dbgtext( "SMB_ACL_USER ");
 815                         break;
 816                 case SMB_ACL_USER_OBJ:
 817                         dbgtext( "SMB_ACL_USER_OBJ ");
 818                         break;
 819                 case SMB_ACL_GROUP:
 820                         dbgtext( "SMB_ACL_GROUP ");
 821                         break;
 822                 case SMB_ACL_GROUP_OBJ:
 823                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 824                         break;
 825                 case SMB_ACL_OTHER:
 826                         dbgtext( "SMB_ACL_OTHER ");
 827                         break;
 828                 default:
 829                         dbgtext( "MASK " );
 830                         break;
 831         }
 832
 833         dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
 834         dbgtext( "perms ");
 835         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 836         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 837         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 838 }
 839
 840 /****************************************************************************
 841  Print out a canon ace list.
 842 ****************************************************************************/
 843
 844 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 845 {
 846         int count = 0;
 847
 848         if( DEBUGLVL( 10 )) {
 849                 dbgtext( "print_canon_ace_list: %s\n", name );
 850                 for (;ace_list; ace_list = ace_list->next, count++)
 851                         print_canon_ace(ace_list, count );
 852         }
 853 }
 854
 855 /****************************************************************************
 856  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 857 ****************************************************************************/
 858
 859 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
 860 {
 861         mode_t ret = 0;
 862
 863         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
 864         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 865         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 866
 867         return ret;
 868 }
 869
 870 /****************************************************************************
 871  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 872 ****************************************************************************/
 873
 874 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 875 {
 876         mode_t ret = 0;
 877
 878         if (mode & r_mask)
 879                 ret |= S_IRUSR;
 880         if (mode & w_mask)
 881                 ret |= S_IWUSR;
 882         if (mode & x_mask)
 883                 ret |= S_IXUSR;
 884
 885         return ret;
 886 }
 887
 888 /****************************************************************************
 889  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 890  an SMB_ACL_PERMSET_T.
 891 ****************************************************************************/
 892
 893 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 894 {
 895         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1)
 896                 return -1;
 897         if (mode & S_IRUSR) {
 898                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
 899                         return -1;
 900         }
 901         if (mode & S_IWUSR) {
 902                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
 903                         return -1;
 904         }
 905         if (mode & S_IXUSR) {
 906                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
 907                         return -1;
 908         }
 909         return 0;
 910 }
 911
 912 /****************************************************************************
 913  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 914 ****************************************************************************/
 915
 916 void create_file_sids(const SMB_STRUCT_STAT *psbuf, struct dom_sid *powner_sid, struct dom_sid *pgroup_sid)
 917 {
 918         uid_to_sid( powner_sid, psbuf->st_ex_uid );
 919         gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
 920 }
 921
 922 /****************************************************************************
 923  Merge aces with a common sid - if both are allow or deny, OR the permissions together and
 924  delete the second one. If the first is deny, mask the permissions off and delete the allow
 925  if the permissions become zero, delete the deny if the permissions are non zero.
 926 ****************************************************************************/
 927
 928 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
 929 {
 930         canon_ace *l_head = *pp_list_head;
 931         canon_ace *curr_ace_outer;
 932         canon_ace *curr_ace_outer_next;
 933
 934         /*
 935          * First, merge allow entries with identical SIDs, and deny entries
 936          * with identical SIDs.
 937          */
 938
 939         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 940                 canon_ace *curr_ace;
 941                 canon_ace *curr_ace_next;
 942
 943                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 944
 945                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 946                         bool can_merge = false;
 947
 948                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 949
 950                         /* For file ACLs we can merge if the SIDs and ALLOW/DENY
 951                          * types are the same. For directory acls we must also
 952                          * ensure the POSIX ACL types are the same. */
 953
 954                         if (!dir_acl) {
 955                                 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 956                                                 (curr_ace->attr == curr_ace_outer->attr));
 957                         } else {
 958                                 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 959                                                 (curr_ace->type == curr_ace_outer->type) &&
 960                                                 (curr_ace->attr == curr_ace_outer->attr));
 961                         }
 962
 963                         if (can_merge) {
 964                                 if( DEBUGLVL( 10 )) {
 965                                         dbgtext("merge_aces: Merging ACE's\n");
 966                                         print_canon_ace( curr_ace_outer, 0);
 967                                         print_canon_ace( curr_ace, 0);
 968                                 }
 969
 970                                 /* Merge two allow or two deny ACE's. */
 971
 972                                 /* Theoretically we shouldn't merge a dir ACE if
 973                                  * one ACE has the CI flag set, and the other
 974                                  * ACE has the OI flag set, but this is rare
 975                                  * enough we can ignore it. */
 976
 977                                 curr_ace_outer->perms |= curr_ace->perms;
 978                                 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
 979                                 DLIST_REMOVE(l_head, curr_ace);
 980                                 TALLOC_FREE(curr_ace);
 981                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 982                         }
 983                 }
 984         }
 985
 986         /*
 987          * Now go through and mask off allow permissions with deny permissions.
 988          * We can delete either the allow or deny here as we know that each SID
 989          * appears only once in the list.
 990          */
 991
 992         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 993                 canon_ace *curr_ace;
 994                 canon_ace *curr_ace_next;
 995
 996                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 997
 998                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 999
1000                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1001
1002                         /*
1003                          * Subtract ACE's with different entries. Due to the ordering constraints
1004                          * we've put on the ACL, we know the deny must be the first one.
1005                          */
1006
1007                         if (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1008                                 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1009
1010                                 if( DEBUGLVL( 10 )) {
1011                                         dbgtext("merge_aces: Masking ACE's\n");
1012                                         print_canon_ace( curr_ace_outer, 0);
1013                                         print_canon_ace( curr_ace, 0);
1014                                 }
1015
1016                                 curr_ace->perms &= ~curr_ace_outer->perms;
1017
1018                                 if (curr_ace->perms == 0) {
1019
1020                                         /*
1021                                          * The deny overrides the allow. Remove the allow.
1022                                          */
1023
1024                                         DLIST_REMOVE(l_head, curr_ace);
1025                                         TALLOC_FREE(curr_ace);
1026                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1027
1028                                 } else {
1029
1030                                         /*
1031                                          * Even after removing permissions, there
1032                                          * are still allow permissions - delete the deny.
1033                                          * It is safe to delete the deny here,
1034                                          * as we are guarenteed by the deny first
1035                                          * ordering that all the deny entries for
1036                                          * this SID have already been merged into one
1037                                          * before we can get to an allow ace.
1038                                          */
1039
1040                                         DLIST_REMOVE(l_head, curr_ace_outer);
1041                                         TALLOC_FREE(curr_ace_outer);
1042                                         break;
1043                                 }
1044                         }
1045
1046                 } /* end for curr_ace */
1047         } /* end for curr_ace_outer */
1048
1049         /* We may have modified the list. */
1050
1051         *pp_list_head = l_head;
1052 }
1053
1054 /****************************************************************************
1055  Check if we need to return NT4.x compatible ACL entries.
1056 ****************************************************************************/
1057
1058 bool nt4_compatible_acls(void)
1059 {
1060         int compat = lp_acl_compatibility();
1061
1062         if (compat == ACL_COMPAT_AUTO) {
1063                 enum remote_arch_types ra_type = get_remote_arch();
1064
1065                 /* Automatically adapt to client */
1066                 return (ra_type <= RA_WINNT);
1067         } else
1068                 return (compat == ACL_COMPAT_WINNT);
1069 }
1070
1071
1072 /****************************************************************************
1073  Map canon_ace perms to permission bits NT.
1074  The attr element is not used here - we only process deny entries on set,
1075  not get. Deny entries are implicit on get with ace->perms = 0.
1076 ****************************************************************************/
1077
1078 uint32_t map_canon_ace_perms(int snum,
1079                                 enum security_ace_type *pacl_type,
1080                                 mode_t perms,
1081                                 bool directory_ace)
1082 {
1083         uint32_t nt_mask = 0;
1084
1085         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1086
1087         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1088                 if (directory_ace) {
1089                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1090                 } else {
1091                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1092                 }
1093         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1094                 /*
1095                  * Windows NT refuses to display ACEs with no permissions in them (but
1096                  * they are perfectly legal with Windows 2000). If the ACE has empty
1097                  * permissions we cannot use 0, so we use the otherwise unused
1098                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1099                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1100                  * to be changed in the future.
1101                  */
1102
1103                 if (nt4_compatible_acls())
1104                         nt_mask = UNIX_ACCESS_NONE;
1105                 else
1106                         nt_mask = 0;
1107         } else {
1108                 if (directory_ace) {
1109                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1110                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1111                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1112                 } else {
1113                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1114                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1115                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1116                 }
1117         }
1118
1119         if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1120                 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1121         }
1122
1123         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1124                         (unsigned int)perms, (unsigned int)nt_mask ));
1125
1126         return nt_mask;
1127 }
1128
1129 /****************************************************************************
1130  Map NT perms to a UNIX mode_t.
1131 ****************************************************************************/
1132
1133 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1134 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1135 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1136
1137 static mode_t map_nt_perms( uint32 *mask, int type)
1138 {
1139         mode_t mode = 0;
1140
1141         switch(type) {
1142         case S_IRUSR:
1143                 if((*mask) & GENERIC_ALL_ACCESS)
1144                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1145                 else {
1146                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1147                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1148                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1149                 }
1150                 break;
1151         case S_IRGRP:
1152                 if((*mask) & GENERIC_ALL_ACCESS)
1153                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1154                 else {
1155                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1156                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1157                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1158                 }
1159                 break;
1160         case S_IROTH:
1161                 if((*mask) & GENERIC_ALL_ACCESS)
1162                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1163                 else {
1164                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1165                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1166                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1167                 }
1168                 break;
1169         }
1170
1171         return mode;
1172 }
1173
1174 /****************************************************************************
1175  Unpack a struct security_descriptor into a UNIX owner and group.
1176 ****************************************************************************/
1177
1178 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1179                         uid_t *puser, gid_t *pgrp,
1180                         uint32 security_info_sent, const struct
1181                         security_descriptor *psd)
1182 {
1183         struct dom_sid owner_sid;
1184         struct dom_sid grp_sid;
1185
1186         *puser = (uid_t)-1;
1187         *pgrp = (gid_t)-1;
1188
1189         if(security_info_sent == 0) {
1190                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1191                 return NT_STATUS_OK;
1192         }
1193
1194         /*
1195          * Validate the owner and group SID's.
1196          */
1197
1198         memset(&owner_sid, '\0', sizeof(owner_sid));
1199         memset(&grp_sid, '\0', sizeof(grp_sid));
1200
1201         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1202
1203         /*
1204          * Don't immediately fail if the owner sid cannot be validated.
1205          * This may be a group chown only set.
1206          */
1207
1208         if (security_info_sent & SECINFO_OWNER) {
1209                 sid_copy(&owner_sid, psd->owner_sid);
1210                 if (!sid_to_uid(&owner_sid, puser)) {
1211                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1212                                 /* this allows take ownership to work
1213                                  * reasonably */
1214                                 *puser = get_current_uid(conn);
1215                         } else {
1216                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1217                                          " owner sid for %s\n",
1218                                          sid_string_dbg(&owner_sid)));
1219                                 return NT_STATUS_INVALID_OWNER;
1220                         }
1221                 }
1222                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1223                          (unsigned int)*puser ));
1224         }
1225
1226         /*
1227          * Don't immediately fail if the group sid cannot be validated.
1228          * This may be an owner chown only set.
1229          */
1230
1231         if (security_info_sent & SECINFO_GROUP) {
1232                 sid_copy(&grp_sid, psd->group_sid);
1233                 if (!sid_to_gid( &grp_sid, pgrp)) {
1234                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1235                                 /* this allows take group ownership to work
1236                                  * reasonably */
1237                                 *pgrp = get_current_gid(conn);
1238                         } else {
1239                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1240                                          " group sid.\n"));
1241                                 return NT_STATUS_INVALID_OWNER;
1242                         }
1243                 }
1244                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1245                          (unsigned int)*pgrp));
1246         }
1247
1248         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1249
1250         return NT_STATUS_OK;
1251 }
1252
1253 /****************************************************************************
1254  Ensure the enforced permissions for this share apply.
1255 ****************************************************************************/
1256
1257 static void apply_default_perms(const struct share_params *params,
1258                                 const bool is_directory, canon_ace *pace,
1259                                 mode_t type)
1260 {
1261         mode_t and_bits = (mode_t)0;
1262         mode_t or_bits = (mode_t)0;
1263
1264         /* Get the initial bits to apply. */
1265
1266         if (is_directory) {
1267                 and_bits = lp_dir_security_mask(params->service);
1268                 or_bits = lp_force_dir_security_mode(params->service);
1269         } else {
1270                 and_bits = lp_security_mask(params->service);
1271                 or_bits = lp_force_security_mode(params->service);
1272         }
1273
1274         /* Now bounce them into the S_USR space. */
1275         switch(type) {
1276         case S_IRUSR:
1277                 /* Ensure owner has read access. */
1278                 pace->perms |= S_IRUSR;
1279                 if (is_directory)
1280                         pace->perms |= (S_IWUSR|S_IXUSR);
1281                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1282                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1283                 break;
1284         case S_IRGRP:
1285                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1286                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1287                 break;
1288         case S_IROTH:
1289                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1290                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1291                 break;
1292         }
1293
1294         pace->perms = ((pace->perms & and_bits)|or_bits);
1295 }
1296
1297 /****************************************************************************
1298  Check if a given uid/SID is in a group gid/SID. This is probably very
1299  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1300 ****************************************************************************/
1301
1302 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1303 {
1304         const char *u_name = NULL;
1305
1306         /* "Everyone" always matches every uid. */
1307
1308         if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1309                 return True;
1310
1311         /*
1312          * if it's the current user, we already have the unix token
1313          * and don't need to do the complex user_in_group_sid() call
1314          */
1315         if (uid_ace->unix_ug.uid == get_current_uid(conn)) {
1316                 const struct security_unix_token *curr_utok = NULL;
1317                 size_t i;
1318
1319                 if (group_ace->unix_ug.gid == get_current_gid(conn)) {
1320                         return True;
1321                 }
1322
1323                 curr_utok = get_current_utok(conn);
1324                 for (i=0; i < curr_utok->ngroups; i++) {
1325                         if (group_ace->unix_ug.gid == curr_utok->groups[i]) {
1326                                 return True;
1327                         }
1328                 }
1329         }
1330
1331         /* u_name talloc'ed off tos. */
1332         u_name = uidtoname(uid_ace->unix_ug.uid);
1333         if (!u_name) {
1334                 return False;
1335         }
1336
1337         /*
1338          * user_in_group_sid() uses create_token_from_username()
1339          * which creates an artificial NT token given just a username,
1340          * so this is not reliable for users from foreign domains
1341          * exported by winbindd!
1342          */
1343         return user_in_group_sid(u_name, &group_ace->trustee);
1344 }
1345
1346 /****************************************************************************
1347  A well formed POSIX file or default ACL has at least 3 entries, a
1348  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1349  In addition, the owner must always have at least read access.
1350  When using this call on get_acl, the pst struct is valid and contains
1351  the mode of the file. When using this call on set_acl, the pst struct has
1352  been modified to have a mode containing the default for this file or directory
1353  type.
1354 ****************************************************************************/
1355
1356 static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
1357                                      const struct share_params *params,
1358                                      const bool is_directory,
1359                                                         const struct dom_sid *pfile_owner_sid,
1360                                                         const struct dom_sid *pfile_grp_sid,
1361                                                         const SMB_STRUCT_STAT *pst,
1362                                                         bool setting_acl)
1363 {
1364         canon_ace *pace;
1365         canon_ace *pace_user = NULL;
1366         canon_ace *pace_group = NULL;
1367         canon_ace *pace_other = NULL;
1368
1369         for (pace = *pp_ace; pace; pace = pace->next) {
1370                 if (pace->type == SMB_ACL_USER_OBJ) {
1371
1372                         if (setting_acl)
1373                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1374                         pace_user = pace;
1375
1376                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1377
1378                         /*
1379                          * Ensure create mask/force create mode is respected on set.
1380                          */
1381
1382                         if (setting_acl)
1383                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1384                         pace_group = pace;
1385
1386                 } else if (pace->type == SMB_ACL_OTHER) {
1387
1388                         /*
1389                          * Ensure create mask/force create mode is respected on set.
1390                          */
1391
1392                         if (setting_acl)
1393                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1394                         pace_other = pace;
1395                 }
1396         }
1397
1398         if (!pace_user) {
1399                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1400                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1401                         return False;
1402                 }
1403
1404                 ZERO_STRUCTP(pace);
1405                 pace->type = SMB_ACL_USER_OBJ;
1406                 pace->owner_type = UID_ACE;
1407                 pace->unix_ug.uid = pst->st_ex_uid;
1408                 pace->trustee = *pfile_owner_sid;
1409                 pace->attr = ALLOW_ACE;
1410                 /* Start with existing permissions, principle of least
1411                    surprises for the user. */
1412                 pace->perms = pst->st_ex_mode;
1413
1414                 if (setting_acl) {
1415                         /* See if the owning user is in any of the other groups in
1416                            the ACE, or if there's a matching user entry.
1417                            If so, OR in the permissions from that entry. */
1418
1419                         canon_ace *pace_iter;
1420
1421                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1422                                 if (pace_iter->type == SMB_ACL_USER &&
1423                                                 pace_iter->unix_ug.uid == pace->unix_ug.uid) {
1424                                         pace->perms |= pace_iter->perms;
1425                                 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1426                                         if (uid_entry_in_group(conn, pace, pace_iter)) {
1427                                                 pace->perms |= pace_iter->perms;
1428                                         }
1429                                 }
1430                         }
1431
1432                         if (pace->perms == 0) {
1433                                 /* If we only got an "everyone" perm, just use that. */
1434                                 if (pace_other)
1435                                         pace->perms = pace_other->perms;
1436                         }
1437
1438                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1439                 } else {
1440                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1441                 }
1442
1443                 DLIST_ADD(*pp_ace, pace);
1444                 pace_user = pace;
1445         }
1446
1447         if (!pace_group) {
1448                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1449                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1450                         return False;
1451                 }
1452
1453                 ZERO_STRUCTP(pace);
1454                 pace->type = SMB_ACL_GROUP_OBJ;
1455                 pace->owner_type = GID_ACE;
1456                 pace->unix_ug.gid = pst->st_ex_gid;
1457                 pace->trustee = *pfile_grp_sid;
1458                 pace->attr = ALLOW_ACE;
1459                 if (setting_acl) {
1460                         /* If we only got an "everyone" perm, just use that. */
1461                         if (pace_other)
1462                                 pace->perms = pace_other->perms;
1463                         else
1464                                 pace->perms = 0;
1465                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1466                 } else {
1467                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1468                 }
1469
1470                 DLIST_ADD(*pp_ace, pace);
1471                 pace_group = pace;
1472         }
1473
1474         if (!pace_other) {
1475                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1476                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1477                         return False;
1478                 }
1479
1480                 ZERO_STRUCTP(pace);
1481                 pace->type = SMB_ACL_OTHER;
1482                 pace->owner_type = WORLD_ACE;
1483                 pace->unix_ug.world = -1;
1484                 pace->trustee = global_sid_World;
1485                 pace->attr = ALLOW_ACE;
1486                 if (setting_acl) {
1487                         pace->perms = 0;
1488                         apply_default_perms(params, is_directory, pace, S_IROTH);
1489                 } else
1490                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1491
1492                 DLIST_ADD(*pp_ace, pace);
1493                 pace_other = pace;
1494         }
1495
1496         if (setting_acl) {
1497                 /* Ensure when setting a POSIX ACL, that the uid for a
1498                    SMB_ACL_USER_OBJ ACE (the owner ACE entry) has a duplicate
1499                    permission entry as an SMB_ACL_USER, and a gid for a
1500                    SMB_ACL_GROUP_OBJ ACE (the primary group ACE entry) also has
1501                    a duplicate permission entry as an SMB_ACL_GROUP. If not,
1502                    then if the ownership or group ownership of this file or
1503                    directory gets changed, the user or group can lose their
1504                    access. */
1505                 bool got_duplicate_user = false;
1506                 bool got_duplicate_group = false;
1507
1508                 for (pace = *pp_ace; pace; pace = pace->next) {
1509                         if (pace->type == SMB_ACL_USER &&
1510                                         pace->unix_ug.uid == pace_user->unix_ug.uid) {
1511                                 /* Already got one. */
1512                                 got_duplicate_user = true;
1513                         } else if (pace->type == SMB_ACL_USER &&
1514                                         pace->unix_ug.uid == pace_user->unix_ug.uid) {
1515                                 /* Already got one. */
1516                                 got_duplicate_group = true;
1517                         }
1518                 }
1519
1520                 if (!got_duplicate_user) {
1521                         /* Add a duplicate SMB_ACL_USER entry. */
1522                         if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1523                                 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1524                                 return false;
1525                         }
1526
1527                         ZERO_STRUCTP(pace);
1528                         pace->type = SMB_ACL_USER;;
1529                         pace->owner_type = UID_ACE;
1530                         pace->unix_ug.uid = pace_user->unix_ug.uid;
1531                         pace->trustee = pace_user->trustee;
1532                         pace->attr = pace_user->attr;
1533                         pace->perms = pace_user->perms;
1534
1535                         DLIST_ADD(*pp_ace, pace);
1536                 }
1537
1538                 if (!got_duplicate_group) {
1539                         /* Add a duplicate SMB_ACL_GROUP entry. */
1540                         if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1541                                 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1542                                 return false;
1543                         }
1544
1545                         ZERO_STRUCTP(pace);
1546                         pace->type = SMB_ACL_GROUP;;
1547                         pace->owner_type = GID_ACE;
1548                         pace->unix_ug.gid = pace_group->unix_ug.gid;
1549                         pace->trustee = pace_group->trustee;
1550                         pace->attr = pace_group->attr;
1551                         pace->perms = pace_group->perms;
1552
1553                         DLIST_ADD(*pp_ace, pace);
1554                 }
1555
1556         }
1557
1558         return True;
1559 }
1560
1561 /****************************************************************************
1562  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1563  If it does not have them, check if there are any entries where the trustee is the
1564  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1565  Note we must not do this to default directory ACLs.
1566 ****************************************************************************/
1567
1568 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1569 {
1570         bool got_user_obj, got_group_obj;
1571         canon_ace *current_ace;
1572         int i, entries;
1573
1574         entries = count_canon_ace_list(ace);
1575         got_user_obj = False;
1576         got_group_obj = False;
1577
1578         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1579                 if (current_ace->type == SMB_ACL_USER_OBJ)
1580                         got_user_obj = True;
1581                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1582                         got_group_obj = True;
1583         }
1584         if (got_user_obj && got_group_obj) {
1585                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1586                 return;
1587         }
1588
1589         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1590                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1591                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1592                         current_ace->type = SMB_ACL_USER_OBJ;
1593                         got_user_obj = True;
1594                 }
1595                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1596                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1597                         current_ace->type = SMB_ACL_GROUP_OBJ;
1598                         got_group_obj = True;
1599                 }
1600         }
1601         if (!got_user_obj)
1602                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1603         if (!got_group_obj)
1604                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1605 }
1606
1607 /****************************************************************************
1608  Unpack a struct security_descriptor into two canonical ace lists.
1609 ****************************************************************************/
1610
1611 static bool create_canon_ace_lists(files_struct *fsp,
1612                                         const SMB_STRUCT_STAT *pst,
1613                                         struct dom_sid *pfile_owner_sid,
1614                                         struct dom_sid *pfile_grp_sid,
1615                                         canon_ace **ppfile_ace,
1616                                         canon_ace **ppdir_ace,
1617                                         const struct security_acl *dacl)
1618 {
1619         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1620         canon_ace *file_ace = NULL;
1621         canon_ace *dir_ace = NULL;
1622         canon_ace *current_ace = NULL;
1623         bool got_dir_allow = False;
1624         bool got_file_allow = False;
1625         int i, j;
1626
1627         *ppfile_ace = NULL;
1628         *ppdir_ace = NULL;
1629
1630         /*
1631          * Convert the incoming ACL into a more regular form.
1632          */
1633
1634         for(i = 0; i < dacl->num_aces; i++) {
1635                 struct security_ace *psa = &dacl->aces[i];
1636
1637                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1638                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1639                         return False;
1640                 }
1641
1642                 if (nt4_compatible_acls()) {
1643                         /*
1644                          * The security mask may be UNIX_ACCESS_NONE which should map into
1645                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1646                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1647                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1648                          */
1649
1650                         /*
1651                          * Convert GENERIC bits to specific bits.
1652                          */
1653
1654                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1655
1656                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1657
1658                         if(psa->access_mask != UNIX_ACCESS_NONE)
1659                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1660                 }
1661         }
1662
1663         /*
1664          * Deal with the fact that NT 4.x re-writes the canonical format
1665          * that we return for default ACLs. If a directory ACE is identical
1666          * to a inherited directory ACE then NT changes the bits so that the
1667          * first ACE is set to OI|IO and the second ACE for this SID is set
1668          * to CI. We need to repair this. JRA.
1669          */
1670
1671         for(i = 0; i < dacl->num_aces; i++) {
1672                 struct security_ace *psa1 = &dacl->aces[i];
1673
1674                 for (j = i + 1; j < dacl->num_aces; j++) {
1675                         struct security_ace *psa2 = &dacl->aces[j];
1676
1677                         if (psa1->access_mask != psa2->access_mask)
1678                                 continue;
1679
1680                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1681                                 continue;
1682
1683                         /*
1684                          * Ok - permission bits and SIDs are equal.
1685                          * Check if flags were re-written.
1686                          */
1687
1688                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1689
1690                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1691                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1692
1693                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1694
1695                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1696                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1697
1698                         }
1699                 }
1700         }
1701
1702         for(i = 0; i < dacl->num_aces; i++) {
1703                 struct security_ace *psa = &dacl->aces[i];
1704
1705                 /*
1706                  * Create a canon_ace entry representing this NT DACL ACE.
1707                  */
1708
1709                 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1710                         free_canon_ace_list(file_ace);
1711                         free_canon_ace_list(dir_ace);
1712                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1713                         return False;
1714                 }
1715
1716                 ZERO_STRUCTP(current_ace);
1717
1718                 sid_copy(&current_ace->trustee, &psa->trustee);
1719
1720                 /*
1721                  * Try and work out if the SID is a user or group
1722                  * as we need to flag these differently for POSIX.
1723                  * Note what kind of a POSIX ACL this should map to.
1724                  */
1725
1726                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1727                         current_ace->owner_type = WORLD_ACE;
1728                         current_ace->unix_ug.world = -1;
1729                         current_ace->type = SMB_ACL_OTHER;
1730                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1731                         current_ace->owner_type = UID_ACE;
1732                         current_ace->unix_ug.uid = pst->st_ex_uid;
1733                         current_ace->type = SMB_ACL_USER_OBJ;
1734
1735                         /*
1736                          * The Creator Owner entry only specifies inheritable permissions,
1737                          * never access permissions. WinNT doesn't always set the ACE to
1738                          * INHERIT_ONLY, though.
1739                          */
1740
1741                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1742
1743                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1744                         current_ace->owner_type = GID_ACE;
1745                         current_ace->unix_ug.gid = pst->st_ex_gid;
1746                         current_ace->type = SMB_ACL_GROUP_OBJ;
1747
1748                         /*
1749                          * The Creator Group entry only specifies inheritable permissions,
1750                          * never access permissions. WinNT doesn't always set the ACE to
1751                          * INHERIT_ONLY, though.
1752                          */
1753                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1754
1755                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1756                         current_ace->owner_type = UID_ACE;
1757                         /* If it's the owning user, this is a user_obj, not
1758                          * a user. */
1759                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1760                                 current_ace->type = SMB_ACL_USER_OBJ;
1761                         } else {
1762                                 current_ace->type = SMB_ACL_USER;
1763                         }
1764                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1765                         current_ace->owner_type = GID_ACE;
1766                         /* If it's the primary group, this is a group_obj, not
1767                          * a group. */
1768                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1769                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1770                         } else {
1771                                 current_ace->type = SMB_ACL_GROUP;
1772                         }
1773                 } else {
1774                         /*
1775                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1776                          */
1777
1778                         if (non_mappable_sid(&psa->trustee)) {
1779                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1780                                            "non-mappable SID %s\n",
1781                                            sid_string_dbg(&psa->trustee)));
1782                                 TALLOC_FREE(current_ace);
1783                                 continue;
1784                         }
1785
1786                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1787                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1788                                         "unknown or foreign SID %s\n",
1789                                         sid_string_dbg(&psa->trustee)));
1790                                 TALLOC_FREE(current_ace);
1791                                 continue;
1792                         }
1793
1794                         free_canon_ace_list(file_ace);
1795                         free_canon_ace_list(dir_ace);
1796                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1797                                   "%s to uid or gid.\n",
1798                                   sid_string_dbg(&current_ace->trustee)));
1799                         TALLOC_FREE(current_ace);
1800                         return False;
1801                 }
1802
1803                 /*
1804                  * Map the given NT permissions into a UNIX mode_t containing only
1805                  * S_I(R|W|X)USR bits.
1806                  */
1807
1808                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1809                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1810
1811                 /* Store the ace_flag. */
1812                 current_ace->ace_flags = psa->flags;
1813
1814                 /*
1815                  * Now add the created ace to either the file list, the directory
1816                  * list, or both. We *MUST* preserve the order here (hence we use
1817                  * DLIST_ADD_END) as NT ACLs are order dependent.
1818                  */
1819
1820                 if (fsp->is_directory) {
1821
1822                         /*
1823                          * We can only add to the default POSIX ACE list if the ACE is
1824                          * designed to be inherited by both files and directories.
1825                          */
1826
1827                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1828                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1829
1830                                 canon_ace *current_dir_ace = current_ace;
1831                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1832
1833                                 /*
1834                                  * Note if this was an allow ace. We can't process
1835                                  * any further deny ace's after this.
1836                                  */
1837
1838                                 if (current_ace->attr == ALLOW_ACE)
1839                                         got_dir_allow = True;
1840
1841                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1842                                         DEBUG(0,("create_canon_ace_lists: "
1843                                                  "malformed ACL in "
1844                                                  "inheritable ACL! Deny entry "
1845                                                  "after Allow entry. Failing "
1846                                                  "to set on file %s.\n",
1847                                                  fsp_str_dbg(fsp)));
1848                                         free_canon_ace_list(file_ace);
1849                                         free_canon_ace_list(dir_ace);
1850                                         return False;
1851                                 }
1852
1853                                 if( DEBUGLVL( 10 )) {
1854                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1855                                         print_canon_ace( current_ace, 0);
1856                                 }
1857
1858                                 /*
1859                                  * If this is not an inherit only ACE we need to add a duplicate
1860                                  * to the file acl.
1861                                  */
1862
1863                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1864                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1865
1866                                         if (!dup_ace) {
1867                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1868                                                 free_canon_ace_list(file_ace);
1869                                                 free_canon_ace_list(dir_ace);
1870                                                 return False;
1871                                         }
1872
1873                                         /*
1874                                          * We must not free current_ace here as its
1875                                          * pointer is now owned by the dir_ace list.
1876                                          */
1877                                         current_ace = dup_ace;
1878                                         /* We've essentially split this ace into two,
1879                                          * and added the ace with inheritance request
1880                                          * bits to the directory ACL. Drop those bits for
1881                                          * the ACE we're adding to the file list. */
1882                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1883                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1884                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1885                                 } else {
1886                                         /*
1887                                          * We must not free current_ace here as its
1888                                          * pointer is now owned by the dir_ace list.
1889                                          */
1890                                         current_ace = NULL;
1891                                 }
1892
1893                                 /*
1894                                  * current_ace is now either owned by file_ace
1895                                  * or is NULL. We can safely operate on current_dir_ace
1896                                  * to treat mapping for default acl entries differently
1897                                  * than access acl entries.
1898                                  */
1899
1900                                 if (current_dir_ace->owner_type == UID_ACE) {
1901                                         /*
1902                                          * We already decided above this is a uid,
1903                                          * for default acls ace's only CREATOR_OWNER
1904                                          * maps to ACL_USER_OBJ. All other uid
1905                                          * ace's are ACL_USER.
1906                                          */
1907                                         if (dom_sid_equal(&current_dir_ace->trustee,
1908                                                         &global_sid_Creator_Owner)) {
1909                                                 current_dir_ace->type = SMB_ACL_USER_OBJ;
1910                                         } else {
1911                                                 current_dir_ace->type = SMB_ACL_USER;
1912                                         }
1913                                 }
1914
1915                                 if (current_dir_ace->owner_type == GID_ACE) {
1916                                         /*
1917                                          * We already decided above this is a gid,
1918                                          * for default acls ace's only CREATOR_GROUP
1919                                          * maps to ACL_GROUP_OBJ. All other uid
1920                                          * ace's are ACL_GROUP.
1921                                          */
1922                                         if (dom_sid_equal(&current_dir_ace->trustee,
1923                                                         &global_sid_Creator_Group)) {
1924                                                 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1925                                         } else {
1926                                                 current_dir_ace->type = SMB_ACL_GROUP;
1927                                         }
1928                                 }
1929                         }
1930                 }
1931
1932                 /*
1933                  * Only add to the file ACL if not inherit only.
1934                  */
1935
1936                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1937                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1938
1939                         /*
1940                          * Note if this was an allow ace. We can't process
1941                          * any further deny ace's after this.
1942                          */
1943
1944                         if (current_ace->attr == ALLOW_ACE)
1945                                 got_file_allow = True;
1946
1947                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1948                                 DEBUG(0,("create_canon_ace_lists: malformed "
1949                                          "ACL in file ACL ! Deny entry after "
1950                                          "Allow entry. Failing to set on file "
1951                                          "%s.\n", fsp_str_dbg(fsp)));
1952                                 free_canon_ace_list(file_ace);
1953                                 free_canon_ace_list(dir_ace);
1954                                 return False;
1955                         }
1956
1957                         if( DEBUGLVL( 10 )) {
1958                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1959                                 print_canon_ace( current_ace, 0);
1960                         }
1961                         all_aces_are_inherit_only = False;
1962                         /*
1963                          * We must not free current_ace here as its
1964                          * pointer is now owned by the file_ace list.
1965                          */
1966                         current_ace = NULL;
1967                 }
1968
1969                 /*
1970                  * Free if ACE was not added.
1971                  */
1972
1973                 TALLOC_FREE(current_ace);
1974         }
1975
1976         if (fsp->is_directory && all_aces_are_inherit_only) {
1977                 /*
1978                  * Windows 2000 is doing one of these weird 'inherit acl'
1979                  * traverses to conserve NTFS ACL resources. Just pretend
1980                  * there was no DACL sent. JRA.
1981                  */
1982
1983                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1984                 free_canon_ace_list(file_ace);
1985                 free_canon_ace_list(dir_ace);
1986                 file_ace = NULL;
1987                 dir_ace = NULL;
1988         } else {
1989                 /*
1990                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
1991                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1992                  * entries can be converted to *_OBJ. Don't do this for the default
1993                  * ACL, we will create them separately for this if needed inside
1994                  * ensure_canon_entry_valid().
1995                  */
1996                 if (file_ace) {
1997                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1998                 }
1999         }
2000
2001         *ppfile_ace = file_ace;
2002         *ppdir_ace = dir_ace;
2003
2004         return True;
2005 }
2006
2007 /****************************************************************************
2008  ASCII art time again... JRA :-).
2009
2010  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2011  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2012  entries). Secondly, the merge code has ensured that all duplicate SID entries for
2013  allow or deny have been merged, so the same SID can only appear once in the deny
2014  list or once in the allow list.
2015
2016  We then process as follows :
2017
2018  ---------------------------------------------------------------------------
2019  First pass - look for a Everyone DENY entry.
2020
2021  If it is deny all (rwx) trunate the list at this point.
2022  Else, walk the list from this point and use the deny permissions of this
2023  entry as a mask on all following allow entries. Finally, delete
2024  the Everyone DENY entry (we have applied it to everything possible).
2025
2026  In addition, in this pass we remove any DENY entries that have
2027  no permissions (ie. they are a DENY nothing).
2028  ---------------------------------------------------------------------------
2029  Second pass - only deal with deny user entries.
2030
2031  DENY user1 (perms XXX)
2032
2033  new_perms = 0
2034  for all following allow group entries where user1 is in group
2035         new_perms |= group_perms;
2036
2037  user1 entry perms = new_perms & ~ XXX;
2038
2039  Convert the deny entry to an allow entry with the new perms and
2040  push to the end of the list. Note if the user was in no groups
2041  this maps to a specific allow nothing entry for this user.
2042
2043  The common case from the NT ACL choser (userX deny all) is
2044  optimised so we don't do the group lookup - we just map to
2045  an allow nothing entry.
2046
2047  What we're doing here is inferring the allow permissions the
2048  person setting the ACE on user1 wanted by looking at the allow
2049  permissions on the groups the user is currently in. This will
2050  be a snapshot, depending on group membership but is the best
2051  we can do and has the advantage of failing closed rather than
2052  open.
2053  ---------------------------------------------------------------------------
2054  Third pass - only deal with deny group entries.
2055
2056  DENY group1 (perms XXX)
2057
2058  for all following allow user entries where user is in group1
2059    user entry perms = user entry perms & ~ XXX;
2060
2061  If there is a group Everyone allow entry with permissions YYY,
2062  convert the group1 entry to an allow entry and modify its
2063  permissions to be :
2064
2065  new_perms = YYY & ~ XXX
2066
2067  and push to the end of the list.
2068
2069  If there is no group Everyone allow entry then convert the
2070  group1 entry to a allow nothing entry and push to the end of the list.
2071
2072  Note that the common case from the NT ACL choser (groupX deny all)
2073  cannot be optimised here as we need to modify user entries who are
2074  in the group to change them to a deny all also.
2075
2076  What we're doing here is modifying the allow permissions of
2077  user entries (which are more specific in POSIX ACLs) to mask
2078  out the explicit deny set on the group they are in. This will
2079  be a snapshot depending on current group membership but is the
2080  best we can do and has the advantage of failing closed rather
2081  than open.
2082  ---------------------------------------------------------------------------
2083  Fourth pass - cope with cumulative permissions.
2084
2085  for all allow user entries, if there exists an allow group entry with
2086  more permissive permissions, and the user is in that group, rewrite the
2087  allow user permissions to contain both sets of permissions.
2088
2089  Currently the code for this is #ifdef'ed out as these semantics make
2090  no sense to me. JRA.
2091  ---------------------------------------------------------------------------
2092
2093  Note we *MUST* do the deny user pass first as this will convert deny user
2094  entries into allow user entries which can then be processed by the deny
2095  group pass.
2096
2097  The above algorithm took a *lot* of thinking about - hence this
2098  explaination :-). JRA.
2099 ****************************************************************************/
2100
2101 /****************************************************************************
2102  Process a canon_ace list entries. This is very complex code. We need
2103  to go through and remove the "deny" permissions from any allow entry that matches
2104  the id of this entry. We have already refused any NT ACL that wasn't in correct
2105  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2106  we just remove it (to fail safe). We have already removed any duplicate ace
2107  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2108  allow entries.
2109 ****************************************************************************/
2110
2111 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2112 {
2113         canon_ace *ace_list = *pp_ace_list;
2114         canon_ace *curr_ace = NULL;
2115         canon_ace *curr_ace_next = NULL;
2116
2117         /* Pass 1 above - look for an Everyone, deny entry. */
2118
2119         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2120                 canon_ace *allow_ace_p;
2121
2122                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2123
2124                 if (curr_ace->attr != DENY_ACE)
2125                         continue;
2126
2127                 if (curr_ace->perms == (mode_t)0) {
2128
2129                         /* Deny nothing entry - delete. */
2130
2131                         DLIST_REMOVE(ace_list, curr_ace);
2132                         continue;
2133                 }
2134
2135                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2136                         continue;
2137
2138                 /* JRATEST - assert. */
2139                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2140
2141                 if (curr_ace->perms == ALL_ACE_PERMS) {
2142
2143                         /*
2144                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2145                          * list at this point including this entry.
2146                          */
2147
2148                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2149
2150                         free_canon_ace_list( curr_ace );
2151                         if (prev_entry)
2152                                 DLIST_REMOVE(ace_list, prev_entry);
2153                         else {
2154                                 /* We deleted the entire list. */
2155                                 ace_list = NULL;
2156                         }
2157                         break;
2158                 }
2159
2160                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2161
2162                         /*
2163                          * Only mask off allow entries.
2164                          */
2165
2166                         if (allow_ace_p->attr != ALLOW_ACE)
2167                                 continue;
2168
2169                         allow_ace_p->perms &= ~curr_ace->perms;
2170                 }
2171
2172                 /*
2173                  * Now it's been applied, remove it.
2174                  */
2175
2176                 DLIST_REMOVE(ace_list, curr_ace);
2177         }
2178
2179         /* Pass 2 above - deal with deny user entries. */
2180
2181         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2182                 mode_t new_perms = (mode_t)0;
2183                 canon_ace *allow_ace_p;
2184
2185                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2186
2187                 if (curr_ace->attr != DENY_ACE)
2188                         continue;
2189
2190                 if (curr_ace->owner_type != UID_ACE)
2191                         continue;
2192
2193                 if (curr_ace->perms == ALL_ACE_PERMS) {
2194
2195                         /*
2196                          * Optimisation - this is a deny everything to this user.
2197                          * Convert to an allow nothing and push to the end of the list.
2198                          */
2199
2200                         curr_ace->attr = ALLOW_ACE;
2201                         curr_ace->perms = (mode_t)0;
2202                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2203                         continue;
2204                 }
2205
2206                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2207
2208                         if (allow_ace_p->attr != ALLOW_ACE)
2209                                 continue;
2210
2211                         /* We process GID_ACE and WORLD_ACE entries only. */
2212
2213                         if (allow_ace_p->owner_type == UID_ACE)
2214                                 continue;
2215
2216                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2217                                 new_perms |= allow_ace_p->perms;
2218                 }
2219
2220                 /*
2221                  * Convert to a allow entry, modify the perms and push to the end
2222                  * of the list.
2223                  */
2224
2225                 curr_ace->attr = ALLOW_ACE;
2226                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2227                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2228         }
2229
2230         /* Pass 3 above - deal with deny group entries. */
2231
2232         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2233                 canon_ace *allow_ace_p;
2234                 canon_ace *allow_everyone_p = NULL;
2235
2236                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2237
2238                 if (curr_ace->attr != DENY_ACE)
2239                         continue;
2240
2241                 if (curr_ace->owner_type != GID_ACE)
2242                         continue;
2243
2244                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2245
2246                         if (allow_ace_p->attr != ALLOW_ACE)
2247                                 continue;
2248
2249                         /* Store a pointer to the Everyone allow, if it exists. */
2250                         if (allow_ace_p->owner_type == WORLD_ACE)
2251                                 allow_everyone_p = allow_ace_p;
2252
2253                         /* We process UID_ACE entries only. */
2254
2255                         if (allow_ace_p->owner_type != UID_ACE)
2256                                 continue;
2257
2258                         /* Mask off the deny group perms. */
2259
2260                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2261                                 allow_ace_p->perms &= ~curr_ace->perms;
2262                 }
2263
2264                 /*
2265                  * Convert the deny to an allow with the correct perms and
2266                  * push to the end of the list.
2267                  */
2268
2269                 curr_ace->attr = ALLOW_ACE;
2270                 if (allow_everyone_p)
2271                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2272                 else
2273                         curr_ace->perms = (mode_t)0;
2274                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2275         }
2276
2277         /* Doing this fourth pass allows Windows semantics to be layered
2278          * on top of POSIX semantics. I'm not sure if this is desirable.
2279          * For example, in W2K ACLs there is no way to say, "Group X no
2280          * access, user Y full access" if user Y is a member of group X.
2281          * This seems completely broken semantics to me.... JRA.
2282          */
2283
2284 #if 0
2285         /* Pass 4 above - deal with allow entries. */
2286
2287         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2288                 canon_ace *allow_ace_p;
2289
2290                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2291
2292                 if (curr_ace->attr != ALLOW_ACE)
2293                         continue;
2294
2295                 if (curr_ace->owner_type != UID_ACE)
2296                         continue;
2297
2298                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2299
2300                         if (allow_ace_p->attr != ALLOW_ACE)
2301                                 continue;
2302
2303                         /* We process GID_ACE entries only. */
2304
2305                         if (allow_ace_p->owner_type != GID_ACE)
2306                                 continue;
2307
2308                         /* OR in the group perms. */
2309
2310                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2311                                 curr_ace->perms |= allow_ace_p->perms;
2312                 }
2313         }
2314 #endif
2315
2316         *pp_ace_list = ace_list;
2317 }
2318
2319 /****************************************************************************
2320  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2321  succeeding.
2322 ****************************************************************************/
2323
2324 static bool unpack_canon_ace(files_struct *fsp,
2325                                 const SMB_STRUCT_STAT *pst,
2326                                 struct dom_sid *pfile_owner_sid,
2327                                 struct dom_sid *pfile_grp_sid,
2328                                 canon_ace **ppfile_ace,
2329                                 canon_ace **ppdir_ace,
2330                                 uint32 security_info_sent,
2331                                 const struct security_descriptor *psd)
2332 {
2333         canon_ace *file_ace = NULL;
2334         canon_ace *dir_ace = NULL;
2335
2336         *ppfile_ace = NULL;
2337         *ppdir_ace = NULL;
2338
2339         if(security_info_sent == 0) {
2340                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2341                 return False;
2342         }
2343
2344         /*
2345          * If no DACL then this is a chown only security descriptor.
2346          */
2347
2348         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2349                 return True;
2350
2351         /*
2352          * Now go through the DACL and create the canon_ace lists.
2353          */
2354
2355         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2356                                                                 &file_ace, &dir_ace, psd->dacl))
2357                 return False;
2358
2359         if ((file_ace == NULL) && (dir_ace == NULL)) {
2360                 /* W2K traverse DACL set - ignore. */
2361                 return True;
2362         }
2363
2364         /*
2365          * Go through the canon_ace list and merge entries
2366          * belonging to identical users of identical allow or deny type.
2367          * We can do this as all deny entries come first, followed by
2368          * all allow entries (we have mandated this before accepting this acl).
2369          */
2370
2371         print_canon_ace_list( "file ace - before merge", file_ace);
2372         merge_aces( &file_ace, false);
2373
2374         print_canon_ace_list( "dir ace - before merge", dir_ace);
2375         merge_aces( &dir_ace, true);
2376
2377         /*
2378          * NT ACLs are order dependent. Go through the acl lists and
2379          * process DENY entries by masking the allow entries.
2380          */
2381
2382         print_canon_ace_list( "file ace - before deny", file_ace);
2383         process_deny_list(fsp->conn, &file_ace);
2384
2385         print_canon_ace_list( "dir ace - before deny", dir_ace);
2386         process_deny_list(fsp->conn, &dir_ace);
2387
2388         /*
2389          * A well formed POSIX file or default ACL has at least 3 entries, a
2390          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2391          * and optionally a mask entry. Ensure this is the case.
2392          */
2393
2394         print_canon_ace_list( "file ace - before valid", file_ace);
2395
2396         if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2397                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2398                 free_canon_ace_list(file_ace);
2399                 free_canon_ace_list(dir_ace);
2400                 return False;
2401         }
2402
2403         print_canon_ace_list( "dir ace - before valid", dir_ace);
2404
2405         if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2406                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2407                 free_canon_ace_list(file_ace);
2408                 free_canon_ace_list(dir_ace);
2409                 return False;
2410         }
2411
2412         print_canon_ace_list( "file ace - return", file_ace);
2413         print_canon_ace_list( "dir ace - return", dir_ace);
2414
2415         *ppfile_ace = file_ace;
2416         *ppdir_ace = dir_ace;
2417         return True;
2418
2419 }
2420
2421 /******************************************************************************
2422  When returning permissions, try and fit NT display
2423  semantics if possible. Note the the canon_entries here must have been malloced.
2424  The list format should be - first entry = owner, followed by group and other user
2425  entries, last entry = other.
2426
2427  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2428  are not ordered, and match on the most specific entry rather than walking a list,
2429  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2430
2431  Entry 0: owner : deny all except read and write.
2432  Entry 1: owner : allow read and write.
2433  Entry 2: group : deny all except read.
2434  Entry 3: group : allow read.
2435  Entry 4: Everyone : allow read.
2436
2437  But NT cannot display this in their ACL editor !
2438 ********************************************************************************/
2439
2440 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2441 {
2442         canon_ace *l_head = *pp_list_head;
2443         canon_ace *owner_ace = NULL;
2444         canon_ace *other_ace = NULL;
2445         canon_ace *ace = NULL;
2446
2447         for (ace = l_head; ace; ace = ace->next) {
2448                 if (ace->type == SMB_ACL_USER_OBJ)
2449                         owner_ace = ace;
2450                 else if (ace->type == SMB_ACL_OTHER) {
2451                         /* Last ace - this is "other" */
2452                         other_ace = ace;
2453                 }
2454         }
2455
2456         if (!owner_ace || !other_ace) {
2457                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2458                         filename ));
2459                 return;
2460         }
2461
2462         /*
2463          * The POSIX algorithm applies to owner first, and other last,
2464          * so ensure they are arranged in this order.
2465          */
2466
2467         if (owner_ace) {
2468                 DLIST_PROMOTE(l_head, owner_ace);
2469         }
2470
2471         if (other_ace) {
2472                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2473         }
2474
2475         /* We have probably changed the head of the list. */
2476
2477         *pp_list_head = l_head;
2478 }
2479
2480 /****************************************************************************
2481  Create a linked list of canonical ACE entries.
2482 ****************************************************************************/
2483
2484 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2485                                    const char *fname, SMB_ACL_T posix_acl,
2486                                    const SMB_STRUCT_STAT *psbuf,
2487                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2488 {
2489         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2490         canon_ace *l_head = NULL;
2491         canon_ace *ace = NULL;
2492         canon_ace *next_ace = NULL;
2493         int entry_id = SMB_ACL_FIRST_ENTRY;
2494         SMB_ACL_ENTRY_T entry;
2495         size_t ace_count;
2496
2497         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2498                 SMB_ACL_TAG_T tagtype;
2499                 SMB_ACL_PERMSET_T permset;
2500                 struct dom_sid sid;
2501                 posix_id unix_ug;
2502                 enum ace_owner owner_type;
2503
2504                 entry_id = SMB_ACL_NEXT_ENTRY;
2505
2506                 /* Is this a MASK entry ? */
2507                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2508                         continue;
2509
2510                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2511                         continue;
2512
2513                 /* Decide which SID to use based on the ACL type. */
2514                 switch(tagtype) {
2515                         case SMB_ACL_USER_OBJ:
2516                                 /* Get the SID from the owner. */
2517                                 sid_copy(&sid, powner);
2518                                 unix_ug.uid = psbuf->st_ex_uid;
2519                                 owner_type = UID_ACE;
2520                                 break;
2521                         case SMB_ACL_USER:
2522                                 {
2523                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2524                                         if (puid == NULL) {
2525                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2526                                                 continue;
2527                                         }
2528                                         uid_to_sid( &sid, *puid);
2529                                         unix_ug.uid = *puid;
2530                                         owner_type = UID_ACE;
2531                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2532                                         break;
2533                                 }
2534                         case SMB_ACL_GROUP_OBJ:
2535                                 /* Get the SID from the owning group. */
2536                                 sid_copy(&sid, pgroup);
2537                                 unix_ug.gid = psbuf->st_ex_gid;
2538                                 owner_type = GID_ACE;
2539                                 break;
2540                         case SMB_ACL_GROUP:
2541                                 {
2542                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2543                                         if (pgid == NULL) {
2544                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2545                                                 continue;
2546                                         }
2547                                         gid_to_sid( &sid, *pgid);
2548                                         unix_ug.gid = *pgid;
2549                                         owner_type = GID_ACE;
2550                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2551                                         break;
2552                                 }
2553                         case SMB_ACL_MASK:
2554                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2555                                 continue; /* Don't count the mask as an entry. */
2556                         case SMB_ACL_OTHER:
2557                                 /* Use the Everyone SID */
2558                                 sid = global_sid_World;
2559                                 unix_ug.world = -1;
2560                                 owner_type = WORLD_ACE;
2561                                 break;
2562                         default:
2563                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2564                                 continue;
2565                 }
2566
2567                 /*
2568                  * Add this entry to the list.
2569                  */
2570
2571                 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2572                         goto fail;
2573
2574                 ZERO_STRUCTP(ace);
2575                 ace->type = tagtype;
2576                 ace->perms = convert_permset_to_mode_t(conn, permset);
2577                 ace->attr = ALLOW_ACE;
2578                 ace->trustee = sid;
2579                 ace->unix_ug = unix_ug;
2580                 ace->owner_type = owner_type;
2581                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2582
2583                 DLIST_ADD(l_head, ace);
2584         }
2585
2586         /*
2587          * This next call will ensure we have at least a user/group/world set.
2588          */
2589
2590         if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2591                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2592                                       psbuf, False))
2593                 goto fail;
2594
2595         /*
2596          * Now go through the list, masking the permissions with the
2597          * acl_mask. Ensure all DENY Entries are at the start of the list.
2598          */
2599
2600         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2601
2602         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2603                 next_ace = ace->next;
2604
2605                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2606                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2607                         ace->perms &= acl_mask;
2608
2609                 if (ace->perms == 0) {
2610                         DLIST_PROMOTE(l_head, ace);
2611                 }
2612
2613                 if( DEBUGLVL( 10 ) ) {
2614                         print_canon_ace(ace, ace_count);
2615                 }
2616         }
2617
2618         arrange_posix_perms(fname,&l_head );
2619
2620         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2621
2622         return l_head;
2623
2624   fail:
2625
2626         free_canon_ace_list(l_head);
2627         return NULL;
2628 }
2629
2630 /****************************************************************************
2631  Check if the current user group list contains a given group.
2632 ****************************************************************************/
2633
2634 bool current_user_in_group(connection_struct *conn, gid_t gid)
2635 {
2636         int i;
2637         const struct security_unix_token *utok = get_current_utok(conn);
2638
2639         for (i = 0; i < utok->ngroups; i++) {
2640                 if (utok->groups[i] == gid) {
2641                         return True;
2642                 }
2643         }
2644
2645         return False;
2646 }
2647
2648 /****************************************************************************
2649  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2650 ****************************************************************************/
2651
2652 static bool acl_group_override(connection_struct *conn,
2653                                const struct smb_filename *smb_fname)
2654 {
2655         if ((errno != EPERM) && (errno != EACCES)) {
2656                 return false;
2657         }
2658
2659         /* file primary group == user primary or supplementary group */
2660         if (lp_acl_group_control(SNUM(conn)) &&
2661             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2662                 return true;
2663         }
2664
2665         /* user has writeable permission */
2666         if (lp_dos_filemode(SNUM(conn)) &&
2667             can_write_to_file(conn, smb_fname)) {
2668                 return true;
2669         }
2670
2671         return false;
2672 }
2673
2674 /****************************************************************************
2675  Attempt to apply an ACL to a file or directory.
2676 ****************************************************************************/
2677
2678 static bool set_canon_ace_list(files_struct *fsp,
2679                                 canon_ace *the_ace,
2680                                 bool default_ace,
2681                                 const SMB_STRUCT_STAT *psbuf,
2682                                 bool *pacl_set_support)
2683 {
2684         connection_struct *conn = fsp->conn;
2685         bool ret = False;
2686         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2687         canon_ace *p_ace;
2688         int i;
2689         SMB_ACL_ENTRY_T mask_entry;
2690         bool got_mask_entry = False;
2691         SMB_ACL_PERMSET_T mask_permset;
2692         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2693         bool needs_mask = False;
2694         mode_t mask_perms = 0;
2695
2696         /* Use the psbuf that was passed in. */
2697         if (psbuf != &fsp->fsp_name->st) {
2698                 fsp->fsp_name->st = *psbuf;
2699         }
2700
2701 #if defined(POSIX_ACL_NEEDS_MASK)
2702         /* HP-UX always wants to have a mask (called "class" there). */
2703         needs_mask = True;
2704 #endif
2705
2706         if (the_acl == NULL) {
2707
2708                 if (!no_acl_syscall_error(errno)) {
2709                         /*
2710                          * Only print this error message if we have some kind of ACL
2711                          * support that's not working. Otherwise we would always get this.
2712                          */
2713                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2714                                 default_ace ? "default" : "file", strerror(errno) ));
2715                 }
2716                 *pacl_set_support = False;
2717                 goto fail;
2718         }
2719
2720         if( DEBUGLVL( 10 )) {
2721                 dbgtext("set_canon_ace_list: setting ACL:\n");
2722                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2723                         print_canon_ace( p_ace, i);
2724                 }
2725         }
2726
2727         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2728                 SMB_ACL_ENTRY_T the_entry;
2729                 SMB_ACL_PERMSET_T the_permset;
2730
2731                 /*
2732                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2733                  * named group entries. But if there is an ACL_MASK entry, it applies
2734                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2735                  * so that it doesn't deny (i.e., mask off) any permissions.
2736                  */
2737
2738                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2739                         needs_mask = True;
2740                         mask_perms |= p_ace->perms;
2741                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2742                         mask_perms |= p_ace->perms;
2743                 }
2744
2745                 /*
2746                  * Get the entry for this ACE.
2747                  */
2748
2749                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2750                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2751                                 i, strerror(errno) ));
2752                         goto fail;
2753                 }
2754
2755                 if (p_ace->type == SMB_ACL_MASK) {
2756                         mask_entry = the_entry;
2757                         got_mask_entry = True;
2758                 }
2759
2760                 /*
2761                  * Ok - we now know the ACL calls should be working, don't
2762                  * allow fallback to chmod.
2763                  */
2764
2765                 *pacl_set_support = True;
2766
2767                 /*
2768                  * Initialise the entry from the canon_ace.
2769                  */
2770
2771                 /*
2772                  * First tell the entry what type of ACE this is.
2773                  */
2774
2775                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2776                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2777                                 i, strerror(errno) ));
2778                         goto fail;
2779                 }
2780
2781                 /*
2782                  * Only set the qualifier (user or group id) if the entry is a user
2783                  * or group id ACE.
2784                  */
2785
2786                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2787                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2788                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2789                                         i, strerror(errno) ));
2790                                 goto fail;
2791                         }
2792                 }
2793
2794                 /*
2795                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2796                  */
2797
2798                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2799                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2800                                 i, strerror(errno) ));
2801                         goto fail;
2802                 }
2803
2804                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2805                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2806                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2807                         goto fail;
2808                 }
2809
2810                 /*
2811                  * ..and apply them to the entry.
2812                  */
2813
2814                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2815                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2816                                 i, strerror(errno) ));
2817                         goto fail;
2818                 }
2819
2820                 if( DEBUGLVL( 10 ))
2821                         print_canon_ace( p_ace, i);
2822
2823         }
2824
2825         if (needs_mask && !got_mask_entry) {
2826                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2827                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2828                         goto fail;
2829                 }
2830
2831                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2832                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2833                         goto fail;
2834                 }
2835
2836                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2837                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2838                         goto fail;
2839                 }
2840
2841                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2842                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2843                         goto fail;
2844                 }
2845
2846                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2847                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2848                         goto fail;
2849                 }
2850         }
2851
2852         /*
2853          * Finally apply it to the file or directory.
2854          */
2855
2856         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2857                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2858                                              the_acl_type, the_acl) == -1) {
2859                         /*
2860                          * Some systems allow all the above calls and only fail with no ACL support
2861                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2862                          */
2863                         if (no_acl_syscall_error(errno)) {
2864                                 *pacl_set_support = False;
2865                         }
2866
2867                         if (acl_group_override(conn, fsp->fsp_name)) {
2868                                 int sret;
2869
2870                                 DEBUG(5,("set_canon_ace_list: acl group "
2871                                          "control on and current user in file "
2872                                          "%s primary group.\n",
2873                                          fsp_str_dbg(fsp)));
2874
2875                                 become_root();
2876                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2877                                     fsp->fsp_name->base_name, the_acl_type,
2878                                     the_acl);
2879                                 unbecome_root();
2880                                 if (sret == 0) {
2881                                         ret = True;
2882                                 }
2883                         }
2884
2885                         if (ret == False) {
2886                                 DEBUG(2,("set_canon_ace_list: "
2887                                          "sys_acl_set_file type %s failed for "
2888                                          "file %s (%s).\n",
2889                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2890                                          "directory default" : "file",
2891                                          fsp_str_dbg(fsp), strerror(errno)));
2892                                 goto fail;
2893                         }
2894                 }
2895         } else {
2896                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2897                         /*
2898                          * Some systems allow all the above calls and only fail with no ACL support
2899                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2900                          */
2901                         if (no_acl_syscall_error(errno)) {
2902                                 *pacl_set_support = False;
2903                         }
2904
2905                         if (acl_group_override(conn, fsp->fsp_name)) {
2906                                 int sret;
2907
2908                                 DEBUG(5,("set_canon_ace_list: acl group "
2909                                          "control on and current user in file "
2910                                          "%s primary group.\n",
2911                                          fsp_str_dbg(fsp)));
2912
2913                                 become_root();
2914                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2915                                 unbecome_root();
2916                                 if (sret == 0) {
2917                                         ret = True;
2918                                 }
2919                         }
2920
2921                         if (ret == False) {
2922                                 DEBUG(2,("set_canon_ace_list: "
2923                                          "sys_acl_set_file failed for file %s "
2924                                          "(%s).\n",
2925                                          fsp_str_dbg(fsp), strerror(errno)));
2926                                 goto fail;
2927                         }
2928                 }
2929         }
2930
2931         ret = True;
2932
2933   fail:
2934
2935         if (the_acl != NULL) {
2936                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2937         }
2938
2939         return ret;
2940 }
2941
2942 /****************************************************************************
2943  Find a particular canon_ace entry.
2944 ****************************************************************************/
2945
2946 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2947 {
2948         while (list) {
2949                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2950                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2951                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2952                         break;
2953                 list = list->next;
2954         }
2955         return list;
2956 }
2957
2958 /****************************************************************************
2959
2960 ****************************************************************************/
2961
2962 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2963 {
2964         SMB_ACL_ENTRY_T entry;
2965
2966         if (!the_acl)
2967                 return NULL;
2968         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2969                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2970                 return NULL;
2971         }
2972         return the_acl;
2973 }
2974
2975 /****************************************************************************
2976  Convert a canon_ace to a generic 3 element permission - if possible.
2977 ****************************************************************************/
2978
2979 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2980
2981 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2982 {
2983         int snum = SNUM(fsp->conn);
2984         size_t ace_count = count_canon_ace_list(file_ace_list);
2985         canon_ace *ace_p;
2986         canon_ace *owner_ace = NULL;
2987         canon_ace *group_ace = NULL;
2988         canon_ace *other_ace = NULL;
2989         mode_t and_bits;
2990         mode_t or_bits;
2991
2992         if (ace_count != 3) {
2993                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2994                          "entries for file %s to convert to posix perms.\n",
2995                          fsp_str_dbg(fsp)));
2996                 return False;
2997         }
2998
2999         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3000                 if (ace_p->owner_type == UID_ACE)
3001                         owner_ace = ace_p;
3002                 else if (ace_p->owner_type == GID_ACE)
3003                         group_ace = ace_p;
3004                 else if (ace_p->owner_type == WORLD_ACE)
3005                         other_ace = ace_p;
3006         }
3007
3008         if (!owner_ace || !group_ace || !other_ace) {
3009                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3010                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3011                 return False;
3012         }
3013
3014         *posix_perms = (mode_t)0;
3015
3016         *posix_perms |= owner_ace->perms;
3017         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3018         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3019         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3020         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3021         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3022         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3023
3024         /* The owner must have at least read access. */
3025
3026         *posix_perms |= S_IRUSR;
3027         if (fsp->is_directory)
3028                 *posix_perms |= (S_IWUSR|S_IXUSR);
3029
3030         /* If requested apply the masks. */
3031
3032         /* Get the initial bits to apply. */
3033
3034         if (fsp->is_directory) {
3035                 and_bits = lp_dir_security_mask(snum);
3036                 or_bits = lp_force_dir_security_mode(snum);
3037         } else {
3038                 and_bits = lp_security_mask(snum);
3039                 or_bits = lp_force_security_mode(snum);
3040         }
3041
3042         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3043
3044         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3045                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3046                   (int)group_ace->perms, (int)other_ace->perms,
3047                   (int)*posix_perms, fsp_str_dbg(fsp)));
3048
3049         return True;
3050 }
3051
3052 /****************************************************************************
3053   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3054   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3055   with CI|OI set so it is inherited and also applies to the directory.
3056   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3057 ****************************************************************************/
3058
3059 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3060 {
3061         size_t i, j;
3062
3063         for (i = 0; i < num_aces; i++) {
3064                 for (j = i+1; j < num_aces; j++) {
3065                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3066                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3067                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3068                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3069
3070                         /* We know the lower number ACE's are file entries. */
3071                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3072                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3073                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3074                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3075                                 (i_inh == j_inh) &&
3076                                 (i_flags_ni == 0) &&
3077                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3078                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3079                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3080                                 /*
3081                                  * W2K wants to have access allowed zero access ACE's
3082                                  * at the end of the list. If the mask is zero, merge
3083                                  * the non-inherited ACE onto the inherited ACE.
3084                                  */
3085
3086                                 if (nt_ace_list[i].access_mask == 0) {
3087                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3088                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3089                                         if (num_aces - i - 1 > 0)
3090                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3091                                                                 sizeof(struct security_ace));
3092
3093                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3094                                                 (unsigned int)i, (unsigned int)j ));
3095                                 } else {
3096                                         /*
3097                                          * These are identical except for the flags.
3098                                          * Merge the inherited ACE onto the non-inherited ACE.
3099                                          */
3100
3101                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3102                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3103                                         if (num_aces - j - 1 > 0)
3104                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3105                                                                 sizeof(struct security_ace));
3106
3107                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3108                                                 (unsigned int)j, (unsigned int)i ));
3109                                 }
3110                                 num_aces--;
3111                                 break;
3112                         }
3113                 }
3114         }
3115
3116         return num_aces;
3117 }
3118
3119 /*
3120  * Add or Replace ACE entry.
3121  * In some cases we need to add a specific ACE for compatibility reasons.
3122  * When doing that we must make sure we are not actually creating a duplicate
3123  * entry. So we need to search whether an ACE entry already exist and eventually
3124  * replacce the access mask, or add a completely new entry if none was found.
3125  *
3126  * This function assumes the array has enough space to add a new entry without
3127  * any reallocation of memory.
3128  */
3129
3130 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3131                                 const struct dom_sid *sid, enum security_ace_type type,
3132                                 uint32_t mask, uint8_t flags)
3133 {
3134         int i;
3135
3136         /* first search for a duplicate */
3137         for (i = 0; i < *num_aces; i++) {
3138                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3139                     (nt_ace_list[i].flags == flags)) break;
3140         }
3141
3142         if (i < *num_aces) { /* found */
3143                 nt_ace_list[i].type = type;
3144                 nt_ace_list[i].access_mask = mask;
3145                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3146                            i, sid_string_dbg(sid), flags));
3147                 return;
3148         }
3149
3150         /* not found, append it */
3151         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3152 }
3153
3154
3155 /****************************************************************************
3156  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3157  the space for the return elements and returns the size needed to return the
3158  security descriptor. This should be the only external function needed for
3159  the UNIX style get ACL.
3160 ****************************************************************************/
3161
3162 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3163                                       const char *name,
3164                                       const SMB_STRUCT_STAT *sbuf,
3165                                       struct pai_val *pal,
3166                                       SMB_ACL_T posix_acl,
3167                                       SMB_ACL_T def_acl,
3168                                       uint32_t security_info,
3169                                       struct security_descriptor **ppdesc)
3170 {
3171         struct dom_sid owner_sid;
3172         struct dom_sid group_sid;
3173         size_t sd_size = 0;
3174         struct security_acl *psa = NULL;
3175         size_t num_acls = 0;
3176         size_t num_def_acls = 0;
3177         size_t num_aces = 0;
3178         canon_ace *file_ace = NULL;
3179         canon_ace *dir_ace = NULL;
3180         struct security_ace *nt_ace_list = NULL;
3181         size_t num_profile_acls = 0;
3182         struct dom_sid orig_owner_sid;
3183         struct security_descriptor *psd = NULL;
3184         int i;
3185
3186         /*
3187          * Get the owner, group and world SIDs.
3188          */
3189
3190         create_file_sids(sbuf, &owner_sid, &group_sid);
3191
3192         if (lp_profile_acls(SNUM(conn))) {
3193                 /* For WXP SP1 the owner must be administrators. */
3194                 sid_copy(&orig_owner_sid, &owner_sid);
3195                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3196                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3197                 num_profile_acls = 3;
3198         }
3199
3200         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3201
3202                 /*
3203                  * In the optimum case Creator Owner and Creator Group would be used for
3204                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3205                  * would lead to usability problems under Windows: The Creator entries
3206                  * are only available in browse lists of directories and not for files;
3207                  * additionally the identity of the owning group couldn't be determined.
3208                  * We therefore use those identities only for Default ACLs.
3209                  */
3210
3211                 /* Create the canon_ace lists. */
3212                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3213                                             &owner_sid, &group_sid, pal,
3214                                             SMB_ACL_TYPE_ACCESS);
3215
3216                 /* We must have *some* ACLS. */
3217
3218                 if (count_canon_ace_list(file_ace) == 0) {
3219                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3220                         goto done;
3221                 }
3222
3223                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3224                         dir_ace = canonicalise_acl(conn, name, def_acl,
3225                                                    sbuf,
3226                                                    &global_sid_Creator_Owner,
3227                                                    &global_sid_Creator_Group,
3228                                                    pal, SMB_ACL_TYPE_DEFAULT);
3229                 }
3230
3231                 /*
3232                  * Create the NT ACE list from the canonical ace lists.
3233                  */
3234
3235                 {
3236                         canon_ace *ace;
3237                         enum security_ace_type nt_acl_type;
3238
3239                         if (nt4_compatible_acls() && dir_ace) {
3240                                 /*
3241                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3242                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3243                                  * remove entries from the Access ACL if the
3244                                  * corresponding Default ACL entries have also been
3245                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3246                                  * are exceptions. We can do nothing
3247                                  * intelligent if the Default ACL contains entries that
3248                                  * are not also contained in the Access ACL, so this
3249                                  * case will still fail under NT 4.
3250                                  */
3251
3252                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3253                                 if (ace && !ace->perms) {
3254                                         DLIST_REMOVE(dir_ace, ace);
3255                                         TALLOC_FREE(ace);
3256
3257                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3258                                         if (ace && !ace->perms) {
3259                                                 DLIST_REMOVE(file_ace, ace);
3260                                                 TALLOC_FREE(ace);
3261                                         }
3262                                 }
3263
3264                                 /*
3265                                  * WinNT doesn't usually have Creator Group
3266                                  * in browse lists, so we send this entry to
3267                                  * WinNT even if it contains no relevant
3268                                  * permissions. Once we can add
3269                                  * Creator Group to browse lists we can
3270                                  * re-enable this.
3271                                  */
3272
3273 #if 0
3274                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3275                                 if (ace && !ace->perms) {
3276                                         DLIST_REMOVE(dir_ace, ace);
3277                                         TALLOC_FREE(ace);
3278                                 }
3279 #endif
3280
3281                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3282                                 if (ace && !ace->perms) {
3283                                         DLIST_REMOVE(file_ace, ace);
3284                                         TALLOC_FREE(ace);
3285                                 }
3286                         }
3287
3288                         num_acls = count_canon_ace_list(file_ace);
3289                         num_def_acls = count_canon_ace_list(dir_ace);
3290
3291                         /* Allocate the ace list. */
3292                         if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3293                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3294                                 goto done;
3295                         }
3296
3297                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3298
3299                         /*
3300                          * Create the NT ACE list from the canonical ace lists.
3301                          */
3302
3303                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3304                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3305                                                 &nt_acl_type,
3306                                                 ace->perms,
3307                                                 S_ISDIR(sbuf->st_ex_mode));
3308                                 init_sec_ace(&nt_ace_list[num_aces++],
3309                                         &ace->trustee,
3310                                         nt_acl_type,
3311                                         acc,
3312                                         ace->ace_flags);
3313                         }
3314
3315                         /* The User must have access to a profile share - even
3316                          * if we can't map the SID. */
3317                         if (lp_profile_acls(SNUM(conn))) {
3318                                 add_or_replace_ace(nt_ace_list, &num_aces,
3319                                                    &global_sid_Builtin_Users,
3320                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3321                                                    FILE_GENERIC_ALL, 0);
3322                         }
3323
3324                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3325                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3326                                                 &nt_acl_type,
3327                                                 ace->perms,
3328                                                 S_ISDIR(sbuf->st_ex_mode));
3329                                 init_sec_ace(&nt_ace_list[num_aces++],
3330                                         &ace->trustee,
3331                                         nt_acl_type,
3332                                         acc,
3333                                         ace->ace_flags |
3334                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3335                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3336                                         SEC_ACE_FLAG_INHERIT_ONLY);
3337                         }
3338
3339                         /* The User must have access to a profile share - even
3340                          * if we can't map the SID. */
3341                         if (lp_profile_acls(SNUM(conn))) {
3342                                 add_or_replace_ace(nt_ace_list, &num_aces,
3343                                                 &global_sid_Builtin_Users,
3344                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3345                                                 FILE_GENERIC_ALL,
3346                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3347                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3348                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3349                         }
3350
3351                         /*
3352                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3353                          * Win2K needs this to get the inheritance correct when replacing ACLs
3354                          * on a directory tree. Based on work by Jim @ IBM.
3355                          */
3356
3357                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3358
3359                         if (lp_profile_acls(SNUM(conn))) {
3360                                 for (i = 0; i < num_aces; i++) {
3361                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3362                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3363                                                                    &orig_owner_sid,
3364                                                                    nt_ace_list[i].type,
3365                                                                    nt_ace_list[i].access_mask,
3366                                                                    nt_ace_list[i].flags);
3367                                                 break;
3368                                         }
3369                                 }
3370                         }
3371                 }
3372
3373                 if (num_aces) {
3374                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3375                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3376                                 goto done;
3377                         }
3378                 }
3379         } /* security_info & SECINFO_DACL */
3380
3381         psd = make_standard_sec_desc( talloc_tos(),
3382                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3383                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3384                         psa,
3385                         &sd_size);
3386
3387         if(!psd) {
3388                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3389                 sd_size = 0;
3390                 goto done;
3391         }
3392
3393         /*
3394          * Windows 2000: The DACL_PROTECTED flag in the security
3395          * descriptor marks the ACL as non-inheriting, i.e., no
3396          * ACEs from higher level directories propagate to this
3397          * ACL. In the POSIX ACL model permissions are only
3398          * inherited at file create time, so ACLs never contain
3399          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3400          * flag doesn't seem to bother Windows NT.
3401          * Always set this if map acl inherit is turned off.
3402          */
3403         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3404                 psd->type |= SEC_DESC_DACL_PROTECTED;
3405         } else {
3406                 psd->type |= pal->sd_type;
3407         }
3408
3409         if (psd->dacl) {
3410                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3411         }
3412
3413         *ppdesc = psd;
3414
3415  done:
3416
3417         if (posix_acl) {
3418                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3419         }
3420         if (def_acl) {
3421                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3422         }
3423         free_canon_ace_list(file_ace);
3424         free_canon_ace_list(dir_ace);
3425         free_inherited_info(pal);
3426         TALLOC_FREE(nt_ace_list);
3427
3428         return NT_STATUS_OK;
3429 }
3430
3431 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3432                            struct security_descriptor **ppdesc)
3433 {
3434         SMB_STRUCT_STAT sbuf;
3435         SMB_ACL_T posix_acl = NULL;
3436         struct pai_val *pal;
3437
3438         *ppdesc = NULL;
3439
3440         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3441                   fsp_str_dbg(fsp)));
3442
3443         /* can it happen that fsp_name == NULL ? */
3444         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3445                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3446                                         security_info, ppdesc);
3447         }
3448
3449         /* Get the stat struct for the owner info. */
3450         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3451                 return map_nt_error_from_unix(errno);
3452         }
3453
3454         /* Get the ACL from the fd. */
3455         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3456
3457         pal = fload_inherited_info(fsp);
3458
3459         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3460                                        &sbuf, pal, posix_acl, NULL,
3461                                        security_info, ppdesc);
3462 }
3463
3464 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3465                           uint32_t security_info, struct security_descriptor **ppdesc)
3466 {
3467         SMB_ACL_T posix_acl = NULL;
3468         SMB_ACL_T def_acl = NULL;
3469         struct pai_val *pal;
3470         struct smb_filename smb_fname;
3471         int ret;
3472
3473         *ppdesc = NULL;
3474
3475         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3476
3477         ZERO_STRUCT(smb_fname);
3478         smb_fname.base_name = discard_const_p(char, name);
3479
3480         /* Get the stat struct for the owner info. */
3481         if (lp_posix_pathnames()) {
3482                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3483         } else {
3484                 ret = SMB_VFS_STAT(conn, &smb_fname);
3485         }
3486
3487         if (ret == -1) {
3488                 return map_nt_error_from_unix(errno);
3489         }
3490
3491         /* Get the ACL from the path. */
3492         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3493
3494         /* If it's a directory get the default POSIX ACL. */
3495         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3496                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3497                 def_acl = free_empty_sys_acl(conn, def_acl);
3498         }
3499
3500         pal = load_inherited_info(conn, name);
3501
3502         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3503                                        posix_acl, def_acl, security_info,
3504                                        ppdesc);
3505 }
3506
3507 /****************************************************************************
3508  Try to chown a file. We will be able to chown it under the following conditions.
3509
3510   1) If we have root privileges, then it will just work.
3511   2) If we have SeRestorePrivilege we can change the user + group to any other user.
3512   3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3513   4) If we have write permission to the file and dos_filemodes is set
3514      then allow chown to the currently authenticated user.
3515 ****************************************************************************/
3516
3517 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3518 {
3519         NTSTATUS status;
3520
3521         if(!CAN_WRITE(fsp->conn)) {
3522                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3523         }
3524
3525         /* Case (1). */
3526         status = vfs_chown_fsp(fsp, uid, gid);
3527         if (NT_STATUS_IS_OK(status)) {
3528                 return status;
3529         }
3530
3531         /* Case (2) / (3) */
3532         if (lp_enable_privileges()) {
3533                 bool has_take_ownership_priv = security_token_has_privilege(
3534                                                 get_current_nttok(fsp->conn),
3535                                                 SEC_PRIV_TAKE_OWNERSHIP);
3536                 bool has_restore_priv = security_token_has_privilege(
3537                                                 get_current_nttok(fsp->conn),
3538                                                 SEC_PRIV_RESTORE);
3539
3540                 if (has_restore_priv) {
3541                         ; /* Case (2) */
3542                 } else if (has_take_ownership_priv) {
3543                         /* Case (3) */
3544                         if (uid == get_current_uid(fsp->conn)) {
3545                                 gid = (gid_t)-1;
3546                         } else {
3547                                 has_take_ownership_priv = false;
3548                         }
3549                 }
3550
3551                 if (has_take_ownership_priv || has_restore_priv) {
3552                         become_root();
3553                         status = vfs_chown_fsp(fsp, uid, gid);
3554                         unbecome_root();
3555                         return status;
3556                 }
3557         }
3558
3559         /* Case (4). */
3560         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3561                 return NT_STATUS_ACCESS_DENIED;
3562         }
3563
3564         /* only allow chown to the current user. This is more secure,
3565            and also copes with the case where the SID in a take ownership ACL is
3566            a local SID on the users workstation
3567         */
3568         if (uid != get_current_uid(fsp->conn)) {
3569                 return NT_STATUS_ACCESS_DENIED;
3570         }
3571
3572         become_root();
3573         /* Keep the current file gid the same. */
3574         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3575         unbecome_root();
3576
3577         return status;
3578 }
3579
3580 #if 0
3581 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3582
3583 /****************************************************************************
3584  Take care of parent ACL inheritance.
3585 ****************************************************************************/
3586
3587 NTSTATUS append_parent_acl(files_struct *fsp,
3588                                 const struct security_descriptor *pcsd,
3589                                 struct security_descriptor **pp_new_sd)
3590 {
3591         struct smb_filename *smb_dname = NULL;
3592         struct security_descriptor *parent_sd = NULL;
3593         files_struct *parent_fsp = NULL;
3594         TALLOC_CTX *mem_ctx = talloc_tos();
3595         char *parent_name = NULL;
3596         struct security_ace *new_ace = NULL;
3597         unsigned int num_aces = pcsd->dacl->num_aces;
3598         NTSTATUS status;
3599         int info;
3600         unsigned int i, j;
3601         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3602         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3603
3604         if (psd == NULL) {
3605                 return NT_STATUS_NO_MEMORY;
3606         }
3607
3608         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3609                             NULL)) {
3610                 return NT_STATUS_NO_MEMORY;
3611         }
3612
3613         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3614                                             &smb_dname);
3615         if (!NT_STATUS_IS_OK(status)) {
3616                 goto fail;
3617         }
3618
3619         status = SMB_VFS_CREATE_FILE(
3620                 fsp->conn,                              /* conn */
3621                 NULL,                                   /* req */
3622                 0,                                      /* root_dir_fid */
3623                 smb_dname,                              /* fname */
3624                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3625                 FILE_SHARE_NONE,                        /* share_access */
3626                 FILE_OPEN,                              /* create_disposition*/
3627                 FILE_DIRECTORY_FILE,                    /* create_options */
3628                 0,                                      /* file_attributes */
3629                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3630                 0,                                      /* allocation_size */
3631                 NULL,                                   /* sd */
3632                 NULL,                                   /* ea_list */
3633                 &parent_fsp,                            /* result */
3634                 &info);                                 /* pinfo */
3635
3636         if (!NT_STATUS_IS_OK(status)) {
3637                 TALLOC_FREE(smb_dname);
3638                 return status;
3639         }
3640
3641         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3642                                     SECINFO_DACL, &parent_sd );
3643
3644         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3645         TALLOC_FREE(smb_dname);
3646
3647         if (!NT_STATUS_IS_OK(status)) {
3648                 return status;
3649         }
3650
3651         /*
3652          * Make room for potentially all the ACLs from
3653          * the parent. We used to add the ugw triple here,
3654          * as we knew we were dealing with POSIX ACLs.
3655          * We no longer need to do so as we can guarentee
3656          * that a default ACL from the parent directory will
3657          * be well formed for POSIX ACLs if it came from a
3658          * POSIX ACL source, and if we're not writing to a
3659          * POSIX ACL sink then we don't care if it's not well
3660          * formed. JRA.
3661          */
3662
3663         num_aces += parent_sd->dacl->num_aces;
3664
3665         if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3666                                         num_aces)) == NULL) {
3667                 return NT_STATUS_NO_MEMORY;
3668         }
3669
3670         /* Start by copying in all the given ACE entries. */
3671         for (i = 0; i < psd->dacl->num_aces; i++) {
3672                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3673         }
3674
3675         /*
3676          * Note that we're ignoring "inherit permissions" here
3677          * as that really only applies to newly created files. JRA.
3678          */
3679
3680         /* Finally append any inherited ACEs. */
3681         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3682                 struct security_ace *se = &parent_sd->dacl->aces[j];
3683
3684                 if (fsp->is_directory) {
3685                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3686                                 /* Doesn't apply to a directory - ignore. */
3687                                 DEBUG(10,("append_parent_acl: directory %s "
3688                                         "ignoring non container "
3689                                         "inherit flags %u on ACE with sid %s "
3690                                         "from parent %s\n",
3691                                         fsp_str_dbg(fsp),
3692                                         (unsigned int)se->flags,
3693                                         sid_string_dbg(&se->trustee),
3694                                         parent_name));
3695                                 continue;
3696                         }
3697                 } else {
3698                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3699                                 /* Doesn't apply to a file - ignore. */
3700                                 DEBUG(10,("append_parent_acl: file %s "
3701                                         "ignoring non object "
3702                                         "inherit flags %u on ACE with sid %s "
3703                                         "from parent %s\n",
3704                                         fsp_str_dbg(fsp),
3705                                         (unsigned int)se->flags,
3706                                         sid_string_dbg(&se->trustee),
3707                                         parent_name));
3708                                 continue;
3709                         }
3710                 }
3711
3712                 if (is_dacl_protected) {
3713                         /* If the DACL is protected it means we must
3714                          * not overwrite an existing ACE entry with the
3715                          * same SID. This is order N^2. Ouch :-(. JRA. */
3716                         unsigned int k;
3717                         for (k = 0; k < psd->dacl->num_aces; k++) {
3718                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3719                                                 &se->trustee)) {
3720                                         break;
3721                                 }
3722                         }
3723                         if (k < psd->dacl->num_aces) {
3724                                 /* SID matched. Ignore. */
3725                                 DEBUG(10,("append_parent_acl: path %s "
3726                                         "ignoring ACE with protected sid %s "
3727                                         "from parent %s\n",
3728                                         fsp_str_dbg(fsp),
3729                                         sid_string_dbg(&se->trustee),
3730                                         parent_name));
3731                                 continue;
3732                         }
3733                 }
3734
3735                 sec_ace_copy(&new_ace[i], se);
3736                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3737                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3738                 }
3739                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3740
3741                 if (fsp->is_directory) {
3742                         /*
3743                          * Strip off any inherit only. It's applied.
3744                          */
3745                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3746                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3747                                 /* No further inheritance. */
3748                                 new_ace[i].flags &=
3749                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3750                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3751                         }
3752                 } else {
3753                         /*
3754                          * Strip off any container or inherit
3755                          * flags, they can't apply to objects.
3756                          */
3757                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3758                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3759                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3760                 }
3761                 i++;
3762
3763                 DEBUG(10,("append_parent_acl: path %s "
3764                         "inheriting ACE with sid %s "
3765                         "from parent %s\n",
3766                         fsp_str_dbg(fsp),
3767                         sid_string_dbg(&se->trustee),
3768                         parent_name));
3769         }
3770
3771         psd->dacl->aces = new_ace;
3772         psd->dacl->num_aces = i;
3773         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3774                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
3775
3776         *pp_new_sd = psd;
3777         return status;
3778 }
3779 #endif
3780
3781 /****************************************************************************
3782  Reply to set a security descriptor on an fsp. security_info_sent is the
3783  description of the following NT ACL.
3784  This should be the only external function needed for the UNIX style set ACL.
3785  We make a copy of psd_orig as internal functions modify the elements inside
3786  it, even though it's a const pointer.
3787 ****************************************************************************/
3788
3789 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3790 {
3791         connection_struct *conn = fsp->conn;
3792         uid_t user = (uid_t)-1;
3793         gid_t grp = (gid_t)-1;
3794         struct dom_sid file_owner_sid;
3795         struct dom_sid file_grp_sid;
3796         canon_ace *file_ace_list = NULL;
3797         canon_ace *dir_ace_list = NULL;
3798         bool acl_perms = False;
3799         mode_t orig_mode = (mode_t)0;
3800         NTSTATUS status;
3801         bool set_acl_as_root = false;
3802         bool acl_set_support = false;
3803         bool ret = false;
3804         struct security_descriptor *psd = NULL;
3805
3806         DEBUG(10,("set_nt_acl: called for file %s\n",
3807                   fsp_str_dbg(fsp)));
3808
3809         if (!CAN_WRITE(conn)) {
3810                 DEBUG(10,("set acl rejected on read-only share\n"));
3811                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3812         }
3813
3814         if (!psd_orig) {
3815                 return NT_STATUS_INVALID_PARAMETER;
3816         }
3817
3818         psd = dup_sec_desc(talloc_tos(), psd_orig);
3819         if (!psd) {
3820                 return NT_STATUS_NO_MEMORY;
3821         }
3822
3823         /*
3824          * Get the current state of the file.
3825          */
3826
3827         status = vfs_stat_fsp(fsp);
3828         if (!NT_STATUS_IS_OK(status)) {
3829                 return status;
3830         }
3831
3832         /* Save the original element we check against. */
3833         orig_mode = fsp->fsp_name->st.st_ex_mode;
3834
3835         /*
3836          * Unpack the user/group/world id's.
3837          */
3838
3839         /* POSIX can't cope with missing owner/group. */
3840         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3841                 security_info_sent &= ~SECINFO_OWNER;
3842         }
3843         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3844                 security_info_sent &= ~SECINFO_GROUP;
3845         }
3846
3847         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3848         if (!NT_STATUS_IS_OK(status)) {
3849                 return status;
3850         }
3851
3852         /*
3853          * Do we need to chown ? If so this must be done first as the incoming
3854          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3855          * Noticed by Simo.
3856          */
3857
3858         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3859             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3860
3861                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3862                          fsp_str_dbg(fsp), (unsigned int)user,
3863                          (unsigned int)grp));
3864
3865                 status = try_chown(fsp, user, grp);
3866                 if(!NT_STATUS_IS_OK(status)) {
3867                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3868                                 "= %s.\n", fsp_str_dbg(fsp),
3869                                 (unsigned int)user,
3870                                 (unsigned int)grp,
3871                                 nt_errstr(status)));
3872                         return status;
3873                 }
3874
3875                 /*
3876                  * Recheck the current state of the file, which may have changed.
3877                  * (suid/sgid bits, for instance)
3878                  */
3879
3880                 status = vfs_stat_fsp(fsp);
3881                 if (!NT_STATUS_IS_OK(status)) {
3882                         return status;
3883                 }
3884
3885                 /* Save the original element we check against. */
3886                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3887
3888                 /* If we successfully chowned, we know we must
3889                  * be able to set the acl, so do it as root.
3890                  */
3891                 set_acl_as_root = true;
3892         }
3893
3894         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3895
3896         if((security_info_sent & SECINFO_DACL) &&
3897                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3898                         (psd->dacl == NULL)) {
3899                 struct security_ace ace[3];
3900
3901                 /* We can't have NULL DACL in POSIX.
3902                    Use owner/group/Everyone -> full access. */
3903
3904                 init_sec_ace(&ace[0],
3905                                 &file_owner_sid,
3906                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3907                                 GENERIC_ALL_ACCESS,
3908                                 0);
3909                 init_sec_ace(&ace[1],
3910                                 &file_grp_sid,
3911                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3912                                 GENERIC_ALL_ACCESS,
3913                                 0);
3914                 init_sec_ace(&ace[2],
3915                                 &global_sid_World,
3916                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3917                                 GENERIC_ALL_ACCESS,
3918                                 0);
3919                 psd->dacl = make_sec_acl(talloc_tos(),
3920                                         NT4_ACL_REVISION,
3921                                         3,
3922                                         ace);
3923                 if (psd->dacl == NULL) {
3924                         return NT_STATUS_NO_MEMORY;
3925                 }
3926                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3927         }
3928
3929         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3930                                      &file_grp_sid, &file_ace_list,
3931                                      &dir_ace_list, security_info_sent, psd);
3932
3933         /* Ignore W2K traverse DACL set. */
3934         if (!file_ace_list && !dir_ace_list) {
3935                 return NT_STATUS_OK;
3936         }
3937
3938         if (!acl_perms) {
3939                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3940                 free_canon_ace_list(file_ace_list);
3941                 free_canon_ace_list(dir_ace_list);
3942                 return NT_STATUS_ACCESS_DENIED;
3943         }
3944
3945         /*
3946          * Only change security if we got a DACL.
3947          */
3948
3949         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3950                 free_canon_ace_list(file_ace_list);
3951                 free_canon_ace_list(dir_ace_list);
3952                 return NT_STATUS_OK;
3953         }
3954
3955         /*
3956          * Try using the POSIX ACL set first. Fall back to chmod if
3957          * we have no ACL support on this filesystem.
3958          */
3959
3960         if (acl_perms && file_ace_list) {
3961                 if (set_acl_as_root) {
3962                         become_root();
3963                 }
3964                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3965                                          &fsp->fsp_name->st, &acl_set_support);
3966                 if (set_acl_as_root) {
3967                         unbecome_root();
3968                 }
3969                 if (acl_set_support && ret == false) {
3970                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3971                                  "%s (%s).\n", fsp_str_dbg(fsp),
3972                                  strerror(errno)));
3973                         free_canon_ace_list(file_ace_list);
3974                         free_canon_ace_list(dir_ace_list);
3975                         return map_nt_error_from_unix(errno);
3976                 }
3977         }
3978
3979         if (acl_perms && acl_set_support && fsp->is_directory) {
3980                 if (dir_ace_list) {
3981                         if (set_acl_as_root) {
3982                                 become_root();
3983                         }
3984                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
3985                                                  &fsp->fsp_name->st,
3986                                                  &acl_set_support);
3987                         if (set_acl_as_root) {
3988                                 unbecome_root();
3989                         }
3990                         if (ret == false) {
3991                                 DEBUG(3,("set_nt_acl: failed to set default "
3992                                          "acl on directory %s (%s).\n",
3993                                          fsp_str_dbg(fsp), strerror(errno)));
3994                                 free_canon_ace_list(file_ace_list);
3995                                 free_canon_ace_list(dir_ace_list);
3996                                 return map_nt_error_from_unix(errno);
3997                         }
3998                 } else {
3999                         int sret = -1;
4000
4001                         /*
4002                          * No default ACL - delete one if it exists.
4003                          */
4004
4005                         if (set_acl_as_root) {
4006                                 become_root();
4007                         }
4008                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4009                             fsp->fsp_name->base_name);
4010                         if (set_acl_as_root) {
4011                                 unbecome_root();
4012                         }
4013                         if (sret == -1) {
4014                                 if (acl_group_override(conn, fsp->fsp_name)) {
4015                                         DEBUG(5,("set_nt_acl: acl group "
4016                                                  "control on and current user "
4017                                                  "in file %s primary group. "
4018                                                  "Override delete_def_acl\n",
4019                                                  fsp_str_dbg(fsp)));
4020
4021                                         become_root();
4022                                         sret =
4023                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4024                                                     conn,
4025                                                     fsp->fsp_name->base_name);
4026                                         unbecome_root();
4027                                 }
4028
4029                                 if (sret == -1) {
4030                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4031                                         free_canon_ace_list(file_ace_list);
4032                                         free_canon_ace_list(dir_ace_list);
4033                                         return map_nt_error_from_unix(errno);
4034                                 }
4035                         }
4036                 }
4037         }
4038
4039         if (acl_set_support) {
4040                 if (set_acl_as_root) {
4041                         become_root();
4042                 }
4043                 store_inheritance_attributes(fsp,
4044                                 file_ace_list,
4045                                 dir_ace_list,
4046                                 psd->type);
4047                 if (set_acl_as_root) {
4048                         unbecome_root();
4049                 }
4050         }
4051
4052         /*
4053          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4054          */
4055
4056         if(!acl_set_support && acl_perms) {
4057                 mode_t posix_perms;
4058
4059                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4060                         free_canon_ace_list(file_ace_list);
4061                         free_canon_ace_list(dir_ace_list);
4062                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4063                                  "posix permissions for file %s.\n",
4064                                  fsp_str_dbg(fsp)));
4065                         return NT_STATUS_ACCESS_DENIED;
4066                 }
4067
4068                 if (orig_mode != posix_perms) {
4069                         int sret = -1;
4070
4071                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4072                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4073
4074                         if (set_acl_as_root) {
4075                                 become_root();
4076                         }
4077                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4078                                              posix_perms);
4079                         if (set_acl_as_root) {
4080                                 unbecome_root();
4081                         }
4082                         if(sret == -1) {
4083                                 if (acl_group_override(conn, fsp->fsp_name)) {
4084                                         DEBUG(5,("set_nt_acl: acl group "
4085                                                  "control on and current user "
4086                                                  "in file %s primary group. "
4087                                                  "Override chmod\n",
4088                                                  fsp_str_dbg(fsp)));
4089
4090                                         become_root();
4091                                         sret = SMB_VFS_CHMOD(conn,
4092                                             fsp->fsp_name->base_name,
4093                                             posix_perms);
4094                                         unbecome_root();
4095                                 }
4096
4097                                 if (sret == -1) {
4098                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4099                                                  "failed. Error = %s.\n",
4100                                                  fsp_str_dbg(fsp),
4101                                                  (unsigned int)posix_perms,
4102                                                  strerror(errno)));
4103                                         free_canon_ace_list(file_ace_list);
4104                                         free_canon_ace_list(dir_ace_list);
4105                                         return map_nt_error_from_unix(errno);
4106                                 }
4107                         }
4108                 }
4109         }
4110
4111         free_canon_ace_list(file_ace_list);
4112         free_canon_ace_list(dir_ace_list);
4113
4114         /* Ensure the stat struct in the fsp is correct. */
4115         status = vfs_stat_fsp(fsp);
4116
4117         return NT_STATUS_OK;
4118 }
4119
4120 /****************************************************************************
4121  Get the actual group bits stored on a file with an ACL. Has no effect if
4122  the file has no ACL. Needed in dosmode code where the stat() will return
4123  the mask bits, not the real group bits, for a file with an ACL.
4124 ****************************************************************************/
4125
4126 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4127 {
4128         int entry_id = SMB_ACL_FIRST_ENTRY;
4129         SMB_ACL_ENTRY_T entry;
4130         SMB_ACL_T posix_acl;
4131         int result = -1;
4132
4133         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4134         if (posix_acl == (SMB_ACL_T)NULL)
4135                 return -1;
4136
4137         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4138                 SMB_ACL_TAG_T tagtype;
4139                 SMB_ACL_PERMSET_T permset;
4140
4141                 entry_id = SMB_ACL_NEXT_ENTRY;
4142
4143                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4144                         break;
4145
4146                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4147                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4148                                 break;
4149                         } else {
4150                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4151                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4152                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4153                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4154                                 result = 0;
4155                                 break;
4156                         }
4157                 }
4158         }
4159         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4160         return result;
4161 }
4162
4163 /****************************************************************************
4164  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4165  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4166 ****************************************************************************/
4167
4168 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4169 {
4170         int entry_id = SMB_ACL_FIRST_ENTRY;
4171         SMB_ACL_ENTRY_T entry;
4172         int num_entries = 0;
4173
4174         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4175                 SMB_ACL_TAG_T tagtype;
4176                 SMB_ACL_PERMSET_T permset;
4177                 mode_t perms;
4178
4179                 entry_id = SMB_ACL_NEXT_ENTRY;
4180
4181                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4182                         return -1;
4183
4184                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4185                         return -1;
4186
4187                 num_entries++;
4188
4189                 switch(tagtype) {
4190                         case SMB_ACL_USER_OBJ:
4191                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4192                                 break;
4193                         case SMB_ACL_GROUP_OBJ:
4194                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4195                                 break;
4196                         case SMB_ACL_MASK:
4197                                 /*
4198                                  * FIXME: The ACL_MASK entry permissions should really be set to
4199                                  * the union of the permissions of all ACL_USER,
4200                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4201                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4202                                  */
4203                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4204                                 break;
4205                         case SMB_ACL_OTHER:
4206                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4207                                 break;
4208                         default:
4209                                 continue;
4210                 }
4211
4212                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4213                         return -1;
4214
4215                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4216                         return -1;
4217         }
4218
4219         /*
4220          * If this is a simple 3 element ACL or no elements then it's a standard
4221          * UNIX permission set. Just use chmod...
4222          */
4223
4224         if ((num_entries == 3) || (num_entries == 0))
4225                 return -1;
4226
4227         return 0;
4228 }
4229
4230 /****************************************************************************
4231  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4232  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4233  resulting ACL on TO.  Note that name is in UNIX character set.
4234 ****************************************************************************/
4235
4236 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4237 {
4238         SMB_ACL_T posix_acl = NULL;
4239         int ret = -1;
4240
4241         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4242                 return -1;
4243
4244         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4245                 goto done;
4246
4247         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4248
4249  done:
4250
4251         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4252         return ret;
4253 }
4254
4255 /****************************************************************************
4256  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4257  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4258  Note that name is in UNIX character set.
4259 ****************************************************************************/
4260
4261 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4262 {
4263         return copy_access_posix_acl(conn, name, name, mode);
4264 }
4265
4266 /****************************************************************************
4267  Check for an existing default POSIX ACL on a directory.
4268 ****************************************************************************/
4269
4270 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4271 {
4272         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4273         bool has_acl = False;
4274         SMB_ACL_ENTRY_T entry;
4275
4276         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4277                 has_acl = True;
4278         }
4279
4280         if (def_acl) {
4281                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4282         }
4283         return has_acl;
4284 }
4285
4286 /****************************************************************************
4287  If the parent directory has no default ACL but it does have an Access ACL,
4288  inherit this Access ACL to file name.
4289 ****************************************************************************/
4290
4291 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4292                        const char *name, mode_t mode)
4293 {
4294         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4295                 return 0;
4296
4297         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4298 }
4299
4300 /****************************************************************************
4301  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4302  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4303 ****************************************************************************/
4304
4305 int fchmod_acl(files_struct *fsp, mode_t mode)
4306 {
4307         connection_struct *conn = fsp->conn;
4308         SMB_ACL_T posix_acl = NULL;
4309         int ret = -1;
4310
4311         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4312                 return -1;
4313
4314         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4315                 goto done;
4316
4317         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4318
4319   done:
4320
4321         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4322         return ret;
4323 }
4324
4325 /****************************************************************************
4326  Map from wire type to permset.
4327 ****************************************************************************/
4328
4329 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4330 {
4331         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4332                 return False;
4333         }
4334
4335         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4336                 return False;
4337         }
4338
4339         if (wire_perm & SMB_POSIX_ACL_READ) {
4340                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4341                         return False;
4342                 }
4343         }
4344         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4345                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4346                         return False;
4347                 }
4348         }
4349         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4350                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4351                         return False;
4352                 }
4353         }
4354         return True;
4355 }
4356
4357 /****************************************************************************
4358  Map from wire type to tagtype.
4359 ****************************************************************************/
4360
4361 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4362 {
4363         switch (wire_tt) {
4364                 case SMB_POSIX_ACL_USER_OBJ:
4365                         *p_tt = SMB_ACL_USER_OBJ;
4366                         break;
4367                 case SMB_POSIX_ACL_USER:
4368                         *p_tt = SMB_ACL_USER;
4369                         break;
4370                 case SMB_POSIX_ACL_GROUP_OBJ:
4371                         *p_tt = SMB_ACL_GROUP_OBJ;
4372                         break;
4373                 case SMB_POSIX_ACL_GROUP:
4374                         *p_tt = SMB_ACL_GROUP;
4375                         break;
4376                 case SMB_POSIX_ACL_MASK:
4377                         *p_tt = SMB_ACL_MASK;
4378                         break;
4379                 case SMB_POSIX_ACL_OTHER:
4380                         *p_tt = SMB_ACL_OTHER;
4381                         break;
4382                 default:
4383                         return False;
4384         }
4385         return True;
4386 }
4387
4388 /****************************************************************************
4389  Create a new POSIX acl from wire permissions.
4390  FIXME ! How does the share mask/mode fit into this.... ?
4391 ****************************************************************************/
4392
4393 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4394 {
4395         unsigned int i;
4396         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4397
4398         if (the_acl == NULL) {
4399                 return NULL;
4400         }
4401
4402         for (i = 0; i < num_acls; i++) {
4403                 SMB_ACL_ENTRY_T the_entry;
4404                 SMB_ACL_PERMSET_T the_permset;
4405                 SMB_ACL_TAG_T tag_type;
4406
4407                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4408                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4409                                 i, strerror(errno) ));
4410                         goto fail;
4411                 }
4412
4413                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4414                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4415                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4416                         goto fail;
4417                 }
4418
4419                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4420                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4421                                 i, strerror(errno) ));
4422                         goto fail;
4423                 }
4424
4425                 /* Get the permset pointer from the new ACL entry. */
4426                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4427                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4428                                 i, strerror(errno) ));
4429                         goto fail;
4430                 }
4431
4432                 /* Map from wire to permissions. */
4433                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4434                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4435                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4436                         goto fail;
4437                 }
4438
4439                 /* Now apply to the new ACL entry. */
4440                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4441                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4442                                 i, strerror(errno) ));
4443                         goto fail;
4444                 }
4445
4446                 if (tag_type == SMB_ACL_USER) {
4447                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4448                         uid_t uid = (uid_t)uidval;
4449                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4450                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4451                                         (unsigned int)uid, i, strerror(errno) ));
4452                                 goto fail;
4453                         }
4454                 }
4455
4456                 if (tag_type == SMB_ACL_GROUP) {
4457                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4458                         gid_t gid = (uid_t)gidval;
4459                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4460                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4461                                         (unsigned int)gid, i, strerror(errno) ));
4462                                 goto fail;
4463                         }
4464                 }
4465         }
4466
4467         return the_acl;
4468
4469  fail:
4470
4471         if (the_acl != NULL) {
4472                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4473         }
4474         return NULL;
4475 }
4476
4477 /****************************************************************************
4478  Calls from UNIX extensions - Default POSIX ACL set.
4479  If num_def_acls == 0 and not a directory just return. If it is a directory
4480  and num_def_acls == 0 then remove the default acl. Else set the default acl
4481  on the directory.
4482 ****************************************************************************/
4483
4484 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4485                                 uint16 num_def_acls, const char *pdata)
4486 {
4487         SMB_ACL_T def_acl = NULL;
4488
4489         if (!S_ISDIR(psbuf->st_ex_mode)) {
4490                 if (num_def_acls) {
4491                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4492                         errno = EISDIR;
4493                         return False;
4494                 } else {
4495                         return True;
4496                 }
4497         }
4498
4499         if (!num_def_acls) {
4500                 /* Remove the default ACL. */
4501                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4502                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4503                                 fname, strerror(errno) ));
4504                         return False;
4505                 }
4506                 return True;
4507         }
4508
4509         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4510                 return False;
4511         }
4512
4513         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4514                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4515                         fname, strerror(errno) ));
4516                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4517                 return False;
4518         }
4519
4520         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4521         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4522         return True;
4523 }
4524
4525 /****************************************************************************
4526  Remove an ACL from a file. As we don't have acl_delete_entry() available
4527  we must read the current acl and copy all entries except MASK, USER and GROUP
4528  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4529  removed.
4530  FIXME ! How does the share mask/mode fit into this.... ?
4531 ****************************************************************************/
4532
4533 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4534 {
4535         SMB_ACL_T file_acl = NULL;
4536         int entry_id = SMB_ACL_FIRST_ENTRY;
4537         SMB_ACL_ENTRY_T entry;
4538         bool ret = False;
4539         /* Create a new ACL with only 3 entries, u/g/w. */
4540         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4541         SMB_ACL_ENTRY_T user_ent = NULL;
4542         SMB_ACL_ENTRY_T group_ent = NULL;
4543         SMB_ACL_ENTRY_T other_ent = NULL;
4544
4545         if (new_file_acl == NULL) {
4546                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4547                 return False;
4548         }
4549
4550         /* Now create the u/g/w entries. */
4551         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4552                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4553                         fname, strerror(errno) ));
4554                 goto done;
4555         }
4556         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4557                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4558                         fname, strerror(errno) ));
4559                 goto done;
4560         }
4561
4562         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4563                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4564                         fname, strerror(errno) ));
4565                 goto done;
4566         }
4567         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4568                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4569                         fname, strerror(errno) ));
4570                 goto done;
4571         }
4572
4573         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4574                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4575                         fname, strerror(errno) ));
4576                 goto done;
4577         }
4578         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4579                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4580                         fname, strerror(errno) ));
4581                 goto done;
4582         }
4583
4584         /* Get the current file ACL. */
4585         if (fsp && fsp->fh->fd != -1) {
4586                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4587         } else {
4588                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4589         }
4590
4591         if (file_acl == NULL) {
4592                 /* This is only returned if an error occurred. Even for a file with
4593                    no acl a u/g/w acl should be returned. */
4594                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4595                         fname, strerror(errno) ));
4596                 goto done;
4597         }
4598
4599         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4600                 SMB_ACL_TAG_T tagtype;
4601                 SMB_ACL_PERMSET_T permset;
4602
4603                 entry_id = SMB_ACL_NEXT_ENTRY;
4604
4605                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4606                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4607                                 fname, strerror(errno) ));
4608                         goto done;
4609                 }
4610
4611                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4612                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4613                                 fname, strerror(errno) ));
4614                         goto done;
4615                 }
4616
4617                 if (tagtype == SMB_ACL_USER_OBJ) {
4618                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4619                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4620                                         fname, strerror(errno) ));
4621                         }
4622                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4623                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4624                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4625                                         fname, strerror(errno) ));
4626                         }
4627                 } else if (tagtype == SMB_ACL_OTHER) {
4628                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4629                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4630                                         fname, strerror(errno) ));
4631                         }
4632                 }
4633         }
4634
4635         /* Set the new empty file ACL. */
4636         if (fsp && fsp->fh->fd != -1) {
4637                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4638                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4639                                 fname, strerror(errno) ));
4640                         goto done;
4641                 }
4642         } else {
4643                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4644                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4645                                 fname, strerror(errno) ));
4646                         goto done;
4647                 }
4648         }
4649
4650         ret = True;
4651
4652  done:
4653
4654         if (file_acl) {
4655                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4656         }
4657         if (new_file_acl) {
4658                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4659         }
4660         return ret;
4661 }
4662
4663 /****************************************************************************
4664  Calls from UNIX extensions - POSIX ACL set.
4665  If num_def_acls == 0 then read/modify/write acl after removing all entries
4666  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4667 ****************************************************************************/
4668
4669 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4670 {
4671         SMB_ACL_T file_acl = NULL;
4672
4673         if (!num_acls) {
4674                 /* Remove the ACL from the file. */
4675                 return remove_posix_acl(conn, fsp, fname);
4676         }
4677
4678         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4679                 return False;
4680         }
4681
4682         if (fsp && fsp->fh->fd != -1) {
4683                 /* The preferred way - use an open fd. */
4684                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4685                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4686                                 fname, strerror(errno) ));
4687                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4688                         return False;
4689                 }
4690         } else {
4691                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4692                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4693                                 fname, strerror(errno) ));
4694                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4695                         return False;
4696                 }
4697         }
4698
4699         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4700         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4701         return True;
4702 }
4703
4704 /********************************************************************
4705  Pull the NT ACL from a file on disk or the OpenEventlog() access
4706  check.  Caller is responsible for freeing the returned security
4707  descriptor via TALLOC_FREE().  This is designed for dealing with
4708  user space access checks in smbd outside of the VFS.  For example,
4709  checking access rights in OpenEventlog().
4710
4711  Assume we are dealing with files (for now)
4712 ********************************************************************/
4713
4714 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4715 {
4716         struct security_descriptor *psd, *ret_sd;
4717         connection_struct *conn;
4718         files_struct finfo;
4719         struct fd_handle fh;
4720         NTSTATUS status;
4721
4722         conn = talloc_zero(ctx, connection_struct);
4723         if (conn == NULL) {
4724                 DEBUG(0, ("talloc failed\n"));
4725                 return NULL;
4726         }
4727
4728         if (!(conn->params = talloc(conn, struct share_params))) {
4729                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4730                 TALLOC_FREE(conn);
4731                 return NULL;
4732         }
4733
4734         conn->params->service = -1;
4735
4736         set_conn_connectpath(conn, "/");
4737
4738         if (!smbd_vfs_init(conn)) {
4739                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4740                 conn_free(conn);
4741                 return NULL;
4742         }
4743
4744         ZERO_STRUCT( finfo );
4745         ZERO_STRUCT( fh );
4746
4747         finfo.fnum = -1;
4748         finfo.conn = conn;
4749         finfo.fh = &fh;
4750         finfo.fh->fd = -1;
4751
4752         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4753                                             &finfo.fsp_name);
4754         if (!NT_STATUS_IS_OK(status)) {
4755                 conn_free(conn);
4756                 return NULL;
4757         }
4758
4759         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4760                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4761                 TALLOC_FREE(finfo.fsp_name);
4762                 conn_free(conn);
4763                 return NULL;
4764         }
4765
4766         ret_sd = dup_sec_desc( ctx, psd );
4767
4768         TALLOC_FREE(finfo.fsp_name);
4769         conn_free(conn);
4770
4771         return ret_sd;
4772 }
4773
4774 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4775
4776 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4777                                         const char *name,
4778                                         SMB_STRUCT_STAT *psbuf,
4779                                         struct security_descriptor **ppdesc)
4780 {
4781         struct dom_sid owner_sid, group_sid;
4782         size_t size = 0;
4783         struct security_ace aces[4];
4784         uint32_t access_mask = 0;
4785         mode_t mode = psbuf->st_ex_mode;
4786         struct security_acl *new_dacl = NULL;
4787         int idx = 0;
4788
4789         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4790                 name, (int)mode ));
4791
4792         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4793         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4794
4795         /*
4796          We provide up to 4 ACEs
4797                 - Owner
4798                 - Group
4799                 - Everyone
4800                 - NT System
4801         */
4802
4803         if (mode & S_IRUSR) {
4804                 if (mode & S_IWUSR) {
4805                         access_mask |= SEC_RIGHTS_FILE_ALL;
4806                 } else {
4807                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4808                 }
4809         }
4810         if (mode & S_IWUSR) {
4811                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4812         }
4813
4814         init_sec_ace(&aces[idx],
4815                         &owner_sid,
4816                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4817                         access_mask,
4818                         0);
4819         idx++;
4820
4821         access_mask = 0;
4822         if (mode & S_IRGRP) {
4823                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4824         }
4825         if (mode & S_IWGRP) {
4826                 /* note that delete is not granted - this matches posix behaviour */
4827                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4828         }
4829         if (access_mask) {
4830                 init_sec_ace(&aces[idx],
4831                         &group_sid,
4832                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4833                         access_mask,
4834                         0);
4835                 idx++;
4836         }
4837
4838         access_mask = 0;
4839         if (mode & S_IROTH) {
4840                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4841         }
4842         if (mode & S_IWOTH) {
4843                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4844         }
4845         if (access_mask) {
4846                 init_sec_ace(&aces[idx],
4847                         &global_sid_World,
4848                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4849                         access_mask,
4850                         0);
4851                 idx++;
4852         }
4853
4854         init_sec_ace(&aces[idx],
4855                         &global_sid_System,
4856                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4857                         SEC_RIGHTS_FILE_ALL,
4858                         0);
4859         idx++;
4860
4861         new_dacl = make_sec_acl(ctx,
4862                         NT4_ACL_REVISION,
4863                         idx,
4864                         aces);
4865
4866         if (!new_dacl) {
4867                 return NT_STATUS_NO_MEMORY;
4868         }
4869
4870         *ppdesc = make_sec_desc(ctx,
4871                         SECURITY_DESCRIPTOR_REVISION_1,
4872                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4873                         &owner_sid,
4874                         &group_sid,
4875                         NULL,
4876                         new_dacl,
4877                         &size);
4878         if (!*ppdesc) {
4879                 return NT_STATUS_NO_MEMORY;
4880         }
4881         return NT_STATUS_OK;
4882 }