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
1506                 for (pace = *pp_ace; pace; pace = pace->next) {
1507                         if (pace->type == SMB_ACL_USER &&
1508                                         pace->unix_ug.uid == pace_user->unix_ug.uid) {
1509                                 /* Already got one. */
1510                                 pace_user = NULL;
1511                         } else if (pace->type == SMB_ACL_USER &&
1512                                         pace->unix_ug.uid == pace_user->unix_ug.uid) {
1513                                 /* Already got one. */
1514                                 pace_group = NULL;
1515                         }
1516                 }
1517
1518                 if (pace_user) {
1519                         /* Add a duplicate SMB_ACL_USER entry. */
1520                         if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1521                                 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1522                                 return false;
1523                         }
1524
1525                         ZERO_STRUCTP(pace);
1526                         pace->type = SMB_ACL_USER;;
1527                         pace->owner_type = UID_ACE;
1528                         pace->unix_ug.uid = pace_user->unix_ug.uid;
1529                         pace->trustee = pace_user->trustee;
1530                         pace->attr = pace_user->attr;
1531                         pace->perms = pace_user->perms;
1532
1533                         DLIST_ADD(*pp_ace, pace);
1534                 }
1535
1536                 if (pace_group) {
1537                         /* Add a duplicate SMB_ACL_GROUP entry. */
1538                         if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1539                                 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1540                                 return false;
1541                         }
1542
1543                         ZERO_STRUCTP(pace);
1544                         pace->type = SMB_ACL_GROUP;;
1545                         pace->owner_type = GID_ACE;
1546                         pace->unix_ug.gid = pace_group->unix_ug.gid;
1547                         pace->trustee = pace_group->trustee;
1548                         pace->attr = pace_group->attr;
1549                         pace->perms = pace_group->perms;
1550
1551                         DLIST_ADD(*pp_ace, pace);
1552                 }
1553
1554         }
1555
1556         return True;
1557 }
1558
1559 /****************************************************************************
1560  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1561  If it does not have them, check if there are any entries where the trustee is the
1562  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1563  Note we must not do this to default directory ACLs.
1564 ****************************************************************************/
1565
1566 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1567 {
1568         bool got_user_obj, got_group_obj;
1569         canon_ace *current_ace;
1570         int i, entries;
1571
1572         entries = count_canon_ace_list(ace);
1573         got_user_obj = False;
1574         got_group_obj = False;
1575
1576         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1577                 if (current_ace->type == SMB_ACL_USER_OBJ)
1578                         got_user_obj = True;
1579                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1580                         got_group_obj = True;
1581         }
1582         if (got_user_obj && got_group_obj) {
1583                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1584                 return;
1585         }
1586
1587         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1588                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1589                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1590                         current_ace->type = SMB_ACL_USER_OBJ;
1591                         got_user_obj = True;
1592                 }
1593                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1594                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1595                         current_ace->type = SMB_ACL_GROUP_OBJ;
1596                         got_group_obj = True;
1597                 }
1598         }
1599         if (!got_user_obj)
1600                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1601         if (!got_group_obj)
1602                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1603 }
1604
1605 /****************************************************************************
1606  Unpack a struct security_descriptor into two canonical ace lists.
1607 ****************************************************************************/
1608
1609 static bool create_canon_ace_lists(files_struct *fsp,
1610                                         const SMB_STRUCT_STAT *pst,
1611                                         struct dom_sid *pfile_owner_sid,
1612                                         struct dom_sid *pfile_grp_sid,
1613                                         canon_ace **ppfile_ace,
1614                                         canon_ace **ppdir_ace,
1615                                         const struct security_acl *dacl)
1616 {
1617         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1618         canon_ace *file_ace = NULL;
1619         canon_ace *dir_ace = NULL;
1620         canon_ace *current_ace = NULL;
1621         bool got_dir_allow = False;
1622         bool got_file_allow = False;
1623         int i, j;
1624
1625         *ppfile_ace = NULL;
1626         *ppdir_ace = NULL;
1627
1628         /*
1629          * Convert the incoming ACL into a more regular form.
1630          */
1631
1632         for(i = 0; i < dacl->num_aces; i++) {
1633                 struct security_ace *psa = &dacl->aces[i];
1634
1635                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1636                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1637                         return False;
1638                 }
1639
1640                 if (nt4_compatible_acls()) {
1641                         /*
1642                          * The security mask may be UNIX_ACCESS_NONE which should map into
1643                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1644                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1645                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1646                          */
1647
1648                         /*
1649                          * Convert GENERIC bits to specific bits.
1650                          */
1651
1652                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1653
1654                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1655
1656                         if(psa->access_mask != UNIX_ACCESS_NONE)
1657                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1658                 }
1659         }
1660
1661         /*
1662          * Deal with the fact that NT 4.x re-writes the canonical format
1663          * that we return for default ACLs. If a directory ACE is identical
1664          * to a inherited directory ACE then NT changes the bits so that the
1665          * first ACE is set to OI|IO and the second ACE for this SID is set
1666          * to CI. We need to repair this. JRA.
1667          */
1668
1669         for(i = 0; i < dacl->num_aces; i++) {
1670                 struct security_ace *psa1 = &dacl->aces[i];
1671
1672                 for (j = i + 1; j < dacl->num_aces; j++) {
1673                         struct security_ace *psa2 = &dacl->aces[j];
1674
1675                         if (psa1->access_mask != psa2->access_mask)
1676                                 continue;
1677
1678                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1679                                 continue;
1680
1681                         /*
1682                          * Ok - permission bits and SIDs are equal.
1683                          * Check if flags were re-written.
1684                          */
1685
1686                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1687
1688                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1689                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1690
1691                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1692
1693                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1694                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1695
1696                         }
1697                 }
1698         }
1699
1700         for(i = 0; i < dacl->num_aces; i++) {
1701                 struct security_ace *psa = &dacl->aces[i];
1702
1703                 /*
1704                  * Create a canon_ace entry representing this NT DACL ACE.
1705                  */
1706
1707                 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1708                         free_canon_ace_list(file_ace);
1709                         free_canon_ace_list(dir_ace);
1710                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1711                         return False;
1712                 }
1713
1714                 ZERO_STRUCTP(current_ace);
1715
1716                 sid_copy(&current_ace->trustee, &psa->trustee);
1717
1718                 /*
1719                  * Try and work out if the SID is a user or group
1720                  * as we need to flag these differently for POSIX.
1721                  * Note what kind of a POSIX ACL this should map to.
1722                  */
1723
1724                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1725                         current_ace->owner_type = WORLD_ACE;
1726                         current_ace->unix_ug.world = -1;
1727                         current_ace->type = SMB_ACL_OTHER;
1728                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1729                         current_ace->owner_type = UID_ACE;
1730                         current_ace->unix_ug.uid = pst->st_ex_uid;
1731                         current_ace->type = SMB_ACL_USER_OBJ;
1732
1733                         /*
1734                          * The Creator Owner entry only specifies inheritable permissions,
1735                          * never access permissions. WinNT doesn't always set the ACE to
1736                          * INHERIT_ONLY, though.
1737                          */
1738
1739                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1740
1741                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1742                         current_ace->owner_type = GID_ACE;
1743                         current_ace->unix_ug.gid = pst->st_ex_gid;
1744                         current_ace->type = SMB_ACL_GROUP_OBJ;
1745
1746                         /*
1747                          * The Creator Group entry only specifies inheritable permissions,
1748                          * never access permissions. WinNT doesn't always set the ACE to
1749                          * INHERIT_ONLY, though.
1750                          */
1751                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1752
1753                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1754                         current_ace->owner_type = UID_ACE;
1755                         /* If it's the owning user, this is a user_obj, not
1756                          * a user. */
1757                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1758                                 current_ace->type = SMB_ACL_USER_OBJ;
1759                         } else {
1760                                 current_ace->type = SMB_ACL_USER;
1761                         }
1762                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1763                         current_ace->owner_type = GID_ACE;
1764                         /* If it's the primary group, this is a group_obj, not
1765                          * a group. */
1766                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1767                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1768                         } else {
1769                                 current_ace->type = SMB_ACL_GROUP;
1770                         }
1771                 } else {
1772                         /*
1773                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1774                          */
1775
1776                         if (non_mappable_sid(&psa->trustee)) {
1777                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1778                                            "non-mappable SID %s\n",
1779                                            sid_string_dbg(&psa->trustee)));
1780                                 TALLOC_FREE(current_ace);
1781                                 continue;
1782                         }
1783
1784                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1785                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1786                                         "unknown or foreign SID %s\n",
1787                                         sid_string_dbg(&psa->trustee)));
1788                                 TALLOC_FREE(current_ace);
1789                                 continue;
1790                         }
1791
1792                         free_canon_ace_list(file_ace);
1793                         free_canon_ace_list(dir_ace);
1794                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1795                                   "%s to uid or gid.\n",
1796                                   sid_string_dbg(&current_ace->trustee)));
1797                         TALLOC_FREE(current_ace);
1798                         return False;
1799                 }
1800
1801                 /*
1802                  * Map the given NT permissions into a UNIX mode_t containing only
1803                  * S_I(R|W|X)USR bits.
1804                  */
1805
1806                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1807                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1808
1809                 /* Store the ace_flag. */
1810                 current_ace->ace_flags = psa->flags;
1811
1812                 /*
1813                  * Now add the created ace to either the file list, the directory
1814                  * list, or both. We *MUST* preserve the order here (hence we use
1815                  * DLIST_ADD_END) as NT ACLs are order dependent.
1816                  */
1817
1818                 if (fsp->is_directory) {
1819
1820                         /*
1821                          * We can only add to the default POSIX ACE list if the ACE is
1822                          * designed to be inherited by both files and directories.
1823                          */
1824
1825                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1826                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1827
1828                                 canon_ace *current_dir_ace = current_ace;
1829                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1830
1831                                 /*
1832                                  * Note if this was an allow ace. We can't process
1833                                  * any further deny ace's after this.
1834                                  */
1835
1836                                 if (current_ace->attr == ALLOW_ACE)
1837                                         got_dir_allow = True;
1838
1839                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1840                                         DEBUG(0,("create_canon_ace_lists: "
1841                                                  "malformed ACL in "
1842                                                  "inheritable ACL! Deny entry "
1843                                                  "after Allow entry. Failing "
1844                                                  "to set on file %s.\n",
1845                                                  fsp_str_dbg(fsp)));
1846                                         free_canon_ace_list(file_ace);
1847                                         free_canon_ace_list(dir_ace);
1848                                         return False;
1849                                 }
1850
1851                                 if( DEBUGLVL( 10 )) {
1852                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1853                                         print_canon_ace( current_ace, 0);
1854                                 }
1855
1856                                 /*
1857                                  * If this is not an inherit only ACE we need to add a duplicate
1858                                  * to the file acl.
1859                                  */
1860
1861                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1862                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1863
1864                                         if (!dup_ace) {
1865                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1866                                                 free_canon_ace_list(file_ace);
1867                                                 free_canon_ace_list(dir_ace);
1868                                                 return False;
1869                                         }
1870
1871                                         /*
1872                                          * We must not free current_ace here as its
1873                                          * pointer is now owned by the dir_ace list.
1874                                          */
1875                                         current_ace = dup_ace;
1876                                         /* We've essentially split this ace into two,
1877                                          * and added the ace with inheritance request
1878                                          * bits to the directory ACL. Drop those bits for
1879                                          * the ACE we're adding to the file list. */
1880                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1881                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1882                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1883                                 } else {
1884                                         /*
1885                                          * We must not free current_ace here as its
1886                                          * pointer is now owned by the dir_ace list.
1887                                          */
1888                                         current_ace = NULL;
1889                                 }
1890
1891                                 /*
1892                                  * current_ace is now either owned by file_ace
1893                                  * or is NULL. We can safely operate on current_dir_ace
1894                                  * to treat mapping for default acl entries differently
1895                                  * than access acl entries.
1896                                  */
1897
1898                                 if (current_dir_ace->owner_type == UID_ACE) {
1899                                         /*
1900                                          * We already decided above this is a uid,
1901                                          * for default acls ace's only CREATOR_OWNER
1902                                          * maps to ACL_USER_OBJ. All other uid
1903                                          * ace's are ACL_USER.
1904                                          */
1905                                         if (dom_sid_equal(&current_dir_ace->trustee,
1906                                                         &global_sid_Creator_Owner)) {
1907                                                 current_dir_ace->type = SMB_ACL_USER_OBJ;
1908                                         } else {
1909                                                 current_dir_ace->type = SMB_ACL_USER;
1910                                         }
1911                                 }
1912
1913                                 if (current_dir_ace->owner_type == GID_ACE) {
1914                                         /*
1915                                          * We already decided above this is a gid,
1916                                          * for default acls ace's only CREATOR_GROUP
1917                                          * maps to ACL_GROUP_OBJ. All other uid
1918                                          * ace's are ACL_GROUP.
1919                                          */
1920                                         if (dom_sid_equal(&current_dir_ace->trustee,
1921                                                         &global_sid_Creator_Group)) {
1922                                                 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1923                                         } else {
1924                                                 current_dir_ace->type = SMB_ACL_GROUP;
1925                                         }
1926                                 }
1927                         }
1928                 }
1929
1930                 /*
1931                  * Only add to the file ACL if not inherit only.
1932                  */
1933
1934                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1935                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1936
1937                         /*
1938                          * Note if this was an allow ace. We can't process
1939                          * any further deny ace's after this.
1940                          */
1941
1942                         if (current_ace->attr == ALLOW_ACE)
1943                                 got_file_allow = True;
1944
1945                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1946                                 DEBUG(0,("create_canon_ace_lists: malformed "
1947                                          "ACL in file ACL ! Deny entry after "
1948                                          "Allow entry. Failing to set on file "
1949                                          "%s.\n", fsp_str_dbg(fsp)));
1950                                 free_canon_ace_list(file_ace);
1951                                 free_canon_ace_list(dir_ace);
1952                                 return False;
1953                         }
1954
1955                         if( DEBUGLVL( 10 )) {
1956                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1957                                 print_canon_ace( current_ace, 0);
1958                         }
1959                         all_aces_are_inherit_only = False;
1960                         /*
1961                          * We must not free current_ace here as its
1962                          * pointer is now owned by the file_ace list.
1963                          */
1964                         current_ace = NULL;
1965                 }
1966
1967                 /*
1968                  * Free if ACE was not added.
1969                  */
1970
1971                 TALLOC_FREE(current_ace);
1972         }
1973
1974         if (fsp->is_directory && all_aces_are_inherit_only) {
1975                 /*
1976                  * Windows 2000 is doing one of these weird 'inherit acl'
1977                  * traverses to conserve NTFS ACL resources. Just pretend
1978                  * there was no DACL sent. JRA.
1979                  */
1980
1981                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1982                 free_canon_ace_list(file_ace);
1983                 free_canon_ace_list(dir_ace);
1984                 file_ace = NULL;
1985                 dir_ace = NULL;
1986         } else {
1987                 /*
1988                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
1989                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1990                  * entries can be converted to *_OBJ. Don't do this for the default
1991                  * ACL, we will create them separately for this if needed inside
1992                  * ensure_canon_entry_valid().
1993                  */
1994                 if (file_ace) {
1995                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1996                 }
1997         }
1998
1999         *ppfile_ace = file_ace;
2000         *ppdir_ace = dir_ace;
2001
2002         return True;
2003 }
2004
2005 /****************************************************************************
2006  ASCII art time again... JRA :-).
2007
2008  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2009  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2010  entries). Secondly, the merge code has ensured that all duplicate SID entries for
2011  allow or deny have been merged, so the same SID can only appear once in the deny
2012  list or once in the allow list.
2013
2014  We then process as follows :
2015
2016  ---------------------------------------------------------------------------
2017  First pass - look for a Everyone DENY entry.
2018
2019  If it is deny all (rwx) trunate the list at this point.
2020  Else, walk the list from this point and use the deny permissions of this
2021  entry as a mask on all following allow entries. Finally, delete
2022  the Everyone DENY entry (we have applied it to everything possible).
2023
2024  In addition, in this pass we remove any DENY entries that have
2025  no permissions (ie. they are a DENY nothing).
2026  ---------------------------------------------------------------------------
2027  Second pass - only deal with deny user entries.
2028
2029  DENY user1 (perms XXX)
2030
2031  new_perms = 0
2032  for all following allow group entries where user1 is in group
2033         new_perms |= group_perms;
2034
2035  user1 entry perms = new_perms & ~ XXX;
2036
2037  Convert the deny entry to an allow entry with the new perms and
2038  push to the end of the list. Note if the user was in no groups
2039  this maps to a specific allow nothing entry for this user.
2040
2041  The common case from the NT ACL choser (userX deny all) is
2042  optimised so we don't do the group lookup - we just map to
2043  an allow nothing entry.
2044
2045  What we're doing here is inferring the allow permissions the
2046  person setting the ACE on user1 wanted by looking at the allow
2047  permissions on the groups the user is currently in. This will
2048  be a snapshot, depending on group membership but is the best
2049  we can do and has the advantage of failing closed rather than
2050  open.
2051  ---------------------------------------------------------------------------
2052  Third pass - only deal with deny group entries.
2053
2054  DENY group1 (perms XXX)
2055
2056  for all following allow user entries where user is in group1
2057    user entry perms = user entry perms & ~ XXX;
2058
2059  If there is a group Everyone allow entry with permissions YYY,
2060  convert the group1 entry to an allow entry and modify its
2061  permissions to be :
2062
2063  new_perms = YYY & ~ XXX
2064
2065  and push to the end of the list.
2066
2067  If there is no group Everyone allow entry then convert the
2068  group1 entry to a allow nothing entry and push to the end of the list.
2069
2070  Note that the common case from the NT ACL choser (groupX deny all)
2071  cannot be optimised here as we need to modify user entries who are
2072  in the group to change them to a deny all also.
2073
2074  What we're doing here is modifying the allow permissions of
2075  user entries (which are more specific in POSIX ACLs) to mask
2076  out the explicit deny set on the group they are in. This will
2077  be a snapshot depending on current group membership but is the
2078  best we can do and has the advantage of failing closed rather
2079  than open.
2080  ---------------------------------------------------------------------------
2081  Fourth pass - cope with cumulative permissions.
2082
2083  for all allow user entries, if there exists an allow group entry with
2084  more permissive permissions, and the user is in that group, rewrite the
2085  allow user permissions to contain both sets of permissions.
2086
2087  Currently the code for this is #ifdef'ed out as these semantics make
2088  no sense to me. JRA.
2089  ---------------------------------------------------------------------------
2090
2091  Note we *MUST* do the deny user pass first as this will convert deny user
2092  entries into allow user entries which can then be processed by the deny
2093  group pass.
2094
2095  The above algorithm took a *lot* of thinking about - hence this
2096  explaination :-). JRA.
2097 ****************************************************************************/
2098
2099 /****************************************************************************
2100  Process a canon_ace list entries. This is very complex code. We need
2101  to go through and remove the "deny" permissions from any allow entry that matches
2102  the id of this entry. We have already refused any NT ACL that wasn't in correct
2103  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2104  we just remove it (to fail safe). We have already removed any duplicate ace
2105  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2106  allow entries.
2107 ****************************************************************************/
2108
2109 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2110 {
2111         canon_ace *ace_list = *pp_ace_list;
2112         canon_ace *curr_ace = NULL;
2113         canon_ace *curr_ace_next = NULL;
2114
2115         /* Pass 1 above - look for an Everyone, deny entry. */
2116
2117         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2118                 canon_ace *allow_ace_p;
2119
2120                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2121
2122                 if (curr_ace->attr != DENY_ACE)
2123                         continue;
2124
2125                 if (curr_ace->perms == (mode_t)0) {
2126
2127                         /* Deny nothing entry - delete. */
2128
2129                         DLIST_REMOVE(ace_list, curr_ace);
2130                         continue;
2131                 }
2132
2133                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2134                         continue;
2135
2136                 /* JRATEST - assert. */
2137                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2138
2139                 if (curr_ace->perms == ALL_ACE_PERMS) {
2140
2141                         /*
2142                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2143                          * list at this point including this entry.
2144                          */
2145
2146                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2147
2148                         free_canon_ace_list( curr_ace );
2149                         if (prev_entry)
2150                                 DLIST_REMOVE(ace_list, prev_entry);
2151                         else {
2152                                 /* We deleted the entire list. */
2153                                 ace_list = NULL;
2154                         }
2155                         break;
2156                 }
2157
2158                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2159
2160                         /*
2161                          * Only mask off allow entries.
2162                          */
2163
2164                         if (allow_ace_p->attr != ALLOW_ACE)
2165                                 continue;
2166
2167                         allow_ace_p->perms &= ~curr_ace->perms;
2168                 }
2169
2170                 /*
2171                  * Now it's been applied, remove it.
2172                  */
2173
2174                 DLIST_REMOVE(ace_list, curr_ace);
2175         }
2176
2177         /* Pass 2 above - deal with deny user entries. */
2178
2179         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2180                 mode_t new_perms = (mode_t)0;
2181                 canon_ace *allow_ace_p;
2182
2183                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2184
2185                 if (curr_ace->attr != DENY_ACE)
2186                         continue;
2187
2188                 if (curr_ace->owner_type != UID_ACE)
2189                         continue;
2190
2191                 if (curr_ace->perms == ALL_ACE_PERMS) {
2192
2193                         /*
2194                          * Optimisation - this is a deny everything to this user.
2195                          * Convert to an allow nothing and push to the end of the list.
2196                          */
2197
2198                         curr_ace->attr = ALLOW_ACE;
2199                         curr_ace->perms = (mode_t)0;
2200                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2201                         continue;
2202                 }
2203
2204                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2205
2206                         if (allow_ace_p->attr != ALLOW_ACE)
2207                                 continue;
2208
2209                         /* We process GID_ACE and WORLD_ACE entries only. */
2210
2211                         if (allow_ace_p->owner_type == UID_ACE)
2212                                 continue;
2213
2214                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2215                                 new_perms |= allow_ace_p->perms;
2216                 }
2217
2218                 /*
2219                  * Convert to a allow entry, modify the perms and push to the end
2220                  * of the list.
2221                  */
2222
2223                 curr_ace->attr = ALLOW_ACE;
2224                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2225                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2226         }
2227
2228         /* Pass 3 above - deal with deny group entries. */
2229
2230         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2231                 canon_ace *allow_ace_p;
2232                 canon_ace *allow_everyone_p = NULL;
2233
2234                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2235
2236                 if (curr_ace->attr != DENY_ACE)
2237                         continue;
2238
2239                 if (curr_ace->owner_type != GID_ACE)
2240                         continue;
2241
2242                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2243
2244                         if (allow_ace_p->attr != ALLOW_ACE)
2245                                 continue;
2246
2247                         /* Store a pointer to the Everyone allow, if it exists. */
2248                         if (allow_ace_p->owner_type == WORLD_ACE)
2249                                 allow_everyone_p = allow_ace_p;
2250
2251                         /* We process UID_ACE entries only. */
2252
2253                         if (allow_ace_p->owner_type != UID_ACE)
2254                                 continue;
2255
2256                         /* Mask off the deny group perms. */
2257
2258                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2259                                 allow_ace_p->perms &= ~curr_ace->perms;
2260                 }
2261
2262                 /*
2263                  * Convert the deny to an allow with the correct perms and
2264                  * push to the end of the list.
2265                  */
2266
2267                 curr_ace->attr = ALLOW_ACE;
2268                 if (allow_everyone_p)
2269                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2270                 else
2271                         curr_ace->perms = (mode_t)0;
2272                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2273         }
2274
2275         /* Doing this fourth pass allows Windows semantics to be layered
2276          * on top of POSIX semantics. I'm not sure if this is desirable.
2277          * For example, in W2K ACLs there is no way to say, "Group X no
2278          * access, user Y full access" if user Y is a member of group X.
2279          * This seems completely broken semantics to me.... JRA.
2280          */
2281
2282 #if 0
2283         /* Pass 4 above - deal with allow entries. */
2284
2285         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2286                 canon_ace *allow_ace_p;
2287
2288                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2289
2290                 if (curr_ace->attr != ALLOW_ACE)
2291                         continue;
2292
2293                 if (curr_ace->owner_type != UID_ACE)
2294                         continue;
2295
2296                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2297
2298                         if (allow_ace_p->attr != ALLOW_ACE)
2299                                 continue;
2300
2301                         /* We process GID_ACE entries only. */
2302
2303                         if (allow_ace_p->owner_type != GID_ACE)
2304                                 continue;
2305
2306                         /* OR in the group perms. */
2307
2308                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2309                                 curr_ace->perms |= allow_ace_p->perms;
2310                 }
2311         }
2312 #endif
2313
2314         *pp_ace_list = ace_list;
2315 }
2316
2317 /****************************************************************************
2318  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2319  succeeding.
2320 ****************************************************************************/
2321
2322 static bool unpack_canon_ace(files_struct *fsp,
2323                                 const SMB_STRUCT_STAT *pst,
2324                                 struct dom_sid *pfile_owner_sid,
2325                                 struct dom_sid *pfile_grp_sid,
2326                                 canon_ace **ppfile_ace,
2327                                 canon_ace **ppdir_ace,
2328                                 uint32 security_info_sent,
2329                                 const struct security_descriptor *psd)
2330 {
2331         canon_ace *file_ace = NULL;
2332         canon_ace *dir_ace = NULL;
2333
2334         *ppfile_ace = NULL;
2335         *ppdir_ace = NULL;
2336
2337         if(security_info_sent == 0) {
2338                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2339                 return False;
2340         }
2341
2342         /*
2343          * If no DACL then this is a chown only security descriptor.
2344          */
2345
2346         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2347                 return True;
2348
2349         /*
2350          * Now go through the DACL and create the canon_ace lists.
2351          */
2352
2353         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2354                                                                 &file_ace, &dir_ace, psd->dacl))
2355                 return False;
2356
2357         if ((file_ace == NULL) && (dir_ace == NULL)) {
2358                 /* W2K traverse DACL set - ignore. */
2359                 return True;
2360         }
2361
2362         /*
2363          * Go through the canon_ace list and merge entries
2364          * belonging to identical users of identical allow or deny type.
2365          * We can do this as all deny entries come first, followed by
2366          * all allow entries (we have mandated this before accepting this acl).
2367          */
2368
2369         print_canon_ace_list( "file ace - before merge", file_ace);
2370         merge_aces( &file_ace, false);
2371
2372         print_canon_ace_list( "dir ace - before merge", dir_ace);
2373         merge_aces( &dir_ace, true);
2374
2375         /*
2376          * NT ACLs are order dependent. Go through the acl lists and
2377          * process DENY entries by masking the allow entries.
2378          */
2379
2380         print_canon_ace_list( "file ace - before deny", file_ace);
2381         process_deny_list(fsp->conn, &file_ace);
2382
2383         print_canon_ace_list( "dir ace - before deny", dir_ace);
2384         process_deny_list(fsp->conn, &dir_ace);
2385
2386         /*
2387          * A well formed POSIX file or default ACL has at least 3 entries, a
2388          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2389          * and optionally a mask entry. Ensure this is the case.
2390          */
2391
2392         print_canon_ace_list( "file ace - before valid", file_ace);
2393
2394         if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2395                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2396                 free_canon_ace_list(file_ace);
2397                 free_canon_ace_list(dir_ace);
2398                 return False;
2399         }
2400
2401         print_canon_ace_list( "dir ace - before valid", dir_ace);
2402
2403         if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2404                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2405                 free_canon_ace_list(file_ace);
2406                 free_canon_ace_list(dir_ace);
2407                 return False;
2408         }
2409
2410         print_canon_ace_list( "file ace - return", file_ace);
2411         print_canon_ace_list( "dir ace - return", dir_ace);
2412
2413         *ppfile_ace = file_ace;
2414         *ppdir_ace = dir_ace;
2415         return True;
2416
2417 }
2418
2419 /******************************************************************************
2420  When returning permissions, try and fit NT display
2421  semantics if possible. Note the the canon_entries here must have been malloced.
2422  The list format should be - first entry = owner, followed by group and other user
2423  entries, last entry = other.
2424
2425  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2426  are not ordered, and match on the most specific entry rather than walking a list,
2427  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2428
2429  Entry 0: owner : deny all except read and write.
2430  Entry 1: owner : allow read and write.
2431  Entry 2: group : deny all except read.
2432  Entry 3: group : allow read.
2433  Entry 4: Everyone : allow read.
2434
2435  But NT cannot display this in their ACL editor !
2436 ********************************************************************************/
2437
2438 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2439 {
2440         canon_ace *l_head = *pp_list_head;
2441         canon_ace *owner_ace = NULL;
2442         canon_ace *other_ace = NULL;
2443         canon_ace *ace = NULL;
2444
2445         for (ace = l_head; ace; ace = ace->next) {
2446                 if (ace->type == SMB_ACL_USER_OBJ)
2447                         owner_ace = ace;
2448                 else if (ace->type == SMB_ACL_OTHER) {
2449                         /* Last ace - this is "other" */
2450                         other_ace = ace;
2451                 }
2452         }
2453
2454         if (!owner_ace || !other_ace) {
2455                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2456                         filename ));
2457                 return;
2458         }
2459
2460         /*
2461          * The POSIX algorithm applies to owner first, and other last,
2462          * so ensure they are arranged in this order.
2463          */
2464
2465         if (owner_ace) {
2466                 DLIST_PROMOTE(l_head, owner_ace);
2467         }
2468
2469         if (other_ace) {
2470                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2471         }
2472
2473         /* We have probably changed the head of the list. */
2474
2475         *pp_list_head = l_head;
2476 }
2477
2478 /****************************************************************************
2479  Create a linked list of canonical ACE entries.
2480 ****************************************************************************/
2481
2482 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2483                                    const char *fname, SMB_ACL_T posix_acl,
2484                                    const SMB_STRUCT_STAT *psbuf,
2485                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2486 {
2487         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2488         canon_ace *l_head = NULL;
2489         canon_ace *ace = NULL;
2490         canon_ace *next_ace = NULL;
2491         int entry_id = SMB_ACL_FIRST_ENTRY;
2492         SMB_ACL_ENTRY_T entry;
2493         size_t ace_count;
2494
2495         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2496                 SMB_ACL_TAG_T tagtype;
2497                 SMB_ACL_PERMSET_T permset;
2498                 struct dom_sid sid;
2499                 posix_id unix_ug;
2500                 enum ace_owner owner_type;
2501
2502                 entry_id = SMB_ACL_NEXT_ENTRY;
2503
2504                 /* Is this a MASK entry ? */
2505                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2506                         continue;
2507
2508                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2509                         continue;
2510
2511                 /* Decide which SID to use based on the ACL type. */
2512                 switch(tagtype) {
2513                         case SMB_ACL_USER_OBJ:
2514                                 /* Get the SID from the owner. */
2515                                 sid_copy(&sid, powner);
2516                                 unix_ug.uid = psbuf->st_ex_uid;
2517                                 owner_type = UID_ACE;
2518                                 break;
2519                         case SMB_ACL_USER:
2520                                 {
2521                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2522                                         if (puid == NULL) {
2523                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2524                                                 continue;
2525                                         }
2526                                         uid_to_sid( &sid, *puid);
2527                                         unix_ug.uid = *puid;
2528                                         owner_type = UID_ACE;
2529                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2530                                         break;
2531                                 }
2532                         case SMB_ACL_GROUP_OBJ:
2533                                 /* Get the SID from the owning group. */
2534                                 sid_copy(&sid, pgroup);
2535                                 unix_ug.gid = psbuf->st_ex_gid;
2536                                 owner_type = GID_ACE;
2537                                 break;
2538                         case SMB_ACL_GROUP:
2539                                 {
2540                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2541                                         if (pgid == NULL) {
2542                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2543                                                 continue;
2544                                         }
2545                                         gid_to_sid( &sid, *pgid);
2546                                         unix_ug.gid = *pgid;
2547                                         owner_type = GID_ACE;
2548                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2549                                         break;
2550                                 }
2551                         case SMB_ACL_MASK:
2552                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2553                                 continue; /* Don't count the mask as an entry. */
2554                         case SMB_ACL_OTHER:
2555                                 /* Use the Everyone SID */
2556                                 sid = global_sid_World;
2557                                 unix_ug.world = -1;
2558                                 owner_type = WORLD_ACE;
2559                                 break;
2560                         default:
2561                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2562                                 continue;
2563                 }
2564
2565                 /*
2566                  * Add this entry to the list.
2567                  */
2568
2569                 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2570                         goto fail;
2571
2572                 ZERO_STRUCTP(ace);
2573                 ace->type = tagtype;
2574                 ace->perms = convert_permset_to_mode_t(conn, permset);
2575                 ace->attr = ALLOW_ACE;
2576                 ace->trustee = sid;
2577                 ace->unix_ug = unix_ug;
2578                 ace->owner_type = owner_type;
2579                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2580
2581                 DLIST_ADD(l_head, ace);
2582         }
2583
2584         /*
2585          * This next call will ensure we have at least a user/group/world set.
2586          */
2587
2588         if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2589                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2590                                       psbuf, False))
2591                 goto fail;
2592
2593         /*
2594          * Now go through the list, masking the permissions with the
2595          * acl_mask. Ensure all DENY Entries are at the start of the list.
2596          */
2597
2598         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2599
2600         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2601                 next_ace = ace->next;
2602
2603                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2604                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2605                         ace->perms &= acl_mask;
2606
2607                 if (ace->perms == 0) {
2608                         DLIST_PROMOTE(l_head, ace);
2609                 }
2610
2611                 if( DEBUGLVL( 10 ) ) {
2612                         print_canon_ace(ace, ace_count);
2613                 }
2614         }
2615
2616         arrange_posix_perms(fname,&l_head );
2617
2618         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2619
2620         return l_head;
2621
2622   fail:
2623
2624         free_canon_ace_list(l_head);
2625         return NULL;
2626 }
2627
2628 /****************************************************************************
2629  Check if the current user group list contains a given group.
2630 ****************************************************************************/
2631
2632 bool current_user_in_group(connection_struct *conn, gid_t gid)
2633 {
2634         int i;
2635         const struct security_unix_token *utok = get_current_utok(conn);
2636
2637         for (i = 0; i < utok->ngroups; i++) {
2638                 if (utok->groups[i] == gid) {
2639                         return True;
2640                 }
2641         }
2642
2643         return False;
2644 }
2645
2646 /****************************************************************************
2647  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2648 ****************************************************************************/
2649
2650 static bool acl_group_override(connection_struct *conn,
2651                                const struct smb_filename *smb_fname)
2652 {
2653         if ((errno != EPERM) && (errno != EACCES)) {
2654                 return false;
2655         }
2656
2657         /* file primary group == user primary or supplementary group */
2658         if (lp_acl_group_control(SNUM(conn)) &&
2659             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2660                 return true;
2661         }
2662
2663         /* user has writeable permission */
2664         if (lp_dos_filemode(SNUM(conn)) &&
2665             can_write_to_file(conn, smb_fname)) {
2666                 return true;
2667         }
2668
2669         return false;
2670 }
2671
2672 /****************************************************************************
2673  Attempt to apply an ACL to a file or directory.
2674 ****************************************************************************/
2675
2676 static bool set_canon_ace_list(files_struct *fsp,
2677                                 canon_ace *the_ace,
2678                                 bool default_ace,
2679                                 const SMB_STRUCT_STAT *psbuf,
2680                                 bool *pacl_set_support)
2681 {
2682         connection_struct *conn = fsp->conn;
2683         bool ret = False;
2684         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2685         canon_ace *p_ace;
2686         int i;
2687         SMB_ACL_ENTRY_T mask_entry;
2688         bool got_mask_entry = False;
2689         SMB_ACL_PERMSET_T mask_permset;
2690         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2691         bool needs_mask = False;
2692         mode_t mask_perms = 0;
2693
2694         /* Use the psbuf that was passed in. */
2695         if (psbuf != &fsp->fsp_name->st) {
2696                 fsp->fsp_name->st = *psbuf;
2697         }
2698
2699 #if defined(POSIX_ACL_NEEDS_MASK)
2700         /* HP-UX always wants to have a mask (called "class" there). */
2701         needs_mask = True;
2702 #endif
2703
2704         if (the_acl == NULL) {
2705
2706                 if (!no_acl_syscall_error(errno)) {
2707                         /*
2708                          * Only print this error message if we have some kind of ACL
2709                          * support that's not working. Otherwise we would always get this.
2710                          */
2711                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2712                                 default_ace ? "default" : "file", strerror(errno) ));
2713                 }
2714                 *pacl_set_support = False;
2715                 goto fail;
2716         }
2717
2718         if( DEBUGLVL( 10 )) {
2719                 dbgtext("set_canon_ace_list: setting ACL:\n");
2720                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2721                         print_canon_ace( p_ace, i);
2722                 }
2723         }
2724
2725         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2726                 SMB_ACL_ENTRY_T the_entry;
2727                 SMB_ACL_PERMSET_T the_permset;
2728
2729                 /*
2730                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2731                  * named group entries. But if there is an ACL_MASK entry, it applies
2732                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2733                  * so that it doesn't deny (i.e., mask off) any permissions.
2734                  */
2735
2736                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2737                         needs_mask = True;
2738                         mask_perms |= p_ace->perms;
2739                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2740                         mask_perms |= p_ace->perms;
2741                 }
2742
2743                 /*
2744                  * Get the entry for this ACE.
2745                  */
2746
2747                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2748                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2749                                 i, strerror(errno) ));
2750                         goto fail;
2751                 }
2752
2753                 if (p_ace->type == SMB_ACL_MASK) {
2754                         mask_entry = the_entry;
2755                         got_mask_entry = True;
2756                 }
2757
2758                 /*
2759                  * Ok - we now know the ACL calls should be working, don't
2760                  * allow fallback to chmod.
2761                  */
2762
2763                 *pacl_set_support = True;
2764
2765                 /*
2766                  * Initialise the entry from the canon_ace.
2767                  */
2768
2769                 /*
2770                  * First tell the entry what type of ACE this is.
2771                  */
2772
2773                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2774                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2775                                 i, strerror(errno) ));
2776                         goto fail;
2777                 }
2778
2779                 /*
2780                  * Only set the qualifier (user or group id) if the entry is a user
2781                  * or group id ACE.
2782                  */
2783
2784                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2785                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2786                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2787                                         i, strerror(errno) ));
2788                                 goto fail;
2789                         }
2790                 }
2791
2792                 /*
2793                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2794                  */
2795
2796                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2797                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2798                                 i, strerror(errno) ));
2799                         goto fail;
2800                 }
2801
2802                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2803                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2804                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2805                         goto fail;
2806                 }
2807
2808                 /*
2809                  * ..and apply them to the entry.
2810                  */
2811
2812                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2813                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2814                                 i, strerror(errno) ));
2815                         goto fail;
2816                 }
2817
2818                 if( DEBUGLVL( 10 ))
2819                         print_canon_ace( p_ace, i);
2820
2821         }
2822
2823         if (needs_mask && !got_mask_entry) {
2824                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2825                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2826                         goto fail;
2827                 }
2828
2829                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2830                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2831                         goto fail;
2832                 }
2833
2834                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2835                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2836                         goto fail;
2837                 }
2838
2839                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2840                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2841                         goto fail;
2842                 }
2843
2844                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2845                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2846                         goto fail;
2847                 }
2848         }
2849
2850         /*
2851          * Finally apply it to the file or directory.
2852          */
2853
2854         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2855                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2856                                              the_acl_type, the_acl) == -1) {
2857                         /*
2858                          * Some systems allow all the above calls and only fail with no ACL support
2859                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2860                          */
2861                         if (no_acl_syscall_error(errno)) {
2862                                 *pacl_set_support = False;
2863                         }
2864
2865                         if (acl_group_override(conn, fsp->fsp_name)) {
2866                                 int sret;
2867
2868                                 DEBUG(5,("set_canon_ace_list: acl group "
2869                                          "control on and current user in file "
2870                                          "%s primary group.\n",
2871                                          fsp_str_dbg(fsp)));
2872
2873                                 become_root();
2874                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2875                                     fsp->fsp_name->base_name, the_acl_type,
2876                                     the_acl);
2877                                 unbecome_root();
2878                                 if (sret == 0) {
2879                                         ret = True;
2880                                 }
2881                         }
2882
2883                         if (ret == False) {
2884                                 DEBUG(2,("set_canon_ace_list: "
2885                                          "sys_acl_set_file type %s failed for "
2886                                          "file %s (%s).\n",
2887                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2888                                          "directory default" : "file",
2889                                          fsp_str_dbg(fsp), strerror(errno)));
2890                                 goto fail;
2891                         }
2892                 }
2893         } else {
2894                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2895                         /*
2896                          * Some systems allow all the above calls and only fail with no ACL support
2897                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2898                          */
2899                         if (no_acl_syscall_error(errno)) {
2900                                 *pacl_set_support = False;
2901                         }
2902
2903                         if (acl_group_override(conn, fsp->fsp_name)) {
2904                                 int sret;
2905
2906                                 DEBUG(5,("set_canon_ace_list: acl group "
2907                                          "control on and current user in file "
2908                                          "%s primary group.\n",
2909                                          fsp_str_dbg(fsp)));
2910
2911                                 become_root();
2912                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2913                                 unbecome_root();
2914                                 if (sret == 0) {
2915                                         ret = True;
2916                                 }
2917                         }
2918
2919                         if (ret == False) {
2920                                 DEBUG(2,("set_canon_ace_list: "
2921                                          "sys_acl_set_file failed for file %s "
2922                                          "(%s).\n",
2923                                          fsp_str_dbg(fsp), strerror(errno)));
2924                                 goto fail;
2925                         }
2926                 }
2927         }
2928
2929         ret = True;
2930
2931   fail:
2932
2933         if (the_acl != NULL) {
2934                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2935         }
2936
2937         return ret;
2938 }
2939
2940 /****************************************************************************
2941  Find a particular canon_ace entry.
2942 ****************************************************************************/
2943
2944 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2945 {
2946         while (list) {
2947                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2948                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2949                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2950                         break;
2951                 list = list->next;
2952         }
2953         return list;
2954 }
2955
2956 /****************************************************************************
2957
2958 ****************************************************************************/
2959
2960 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2961 {
2962         SMB_ACL_ENTRY_T entry;
2963
2964         if (!the_acl)
2965                 return NULL;
2966         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2967                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2968                 return NULL;
2969         }
2970         return the_acl;
2971 }
2972
2973 /****************************************************************************
2974  Convert a canon_ace to a generic 3 element permission - if possible.
2975 ****************************************************************************/
2976
2977 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2978
2979 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2980 {
2981         int snum = SNUM(fsp->conn);
2982         size_t ace_count = count_canon_ace_list(file_ace_list);
2983         canon_ace *ace_p;
2984         canon_ace *owner_ace = NULL;
2985         canon_ace *group_ace = NULL;
2986         canon_ace *other_ace = NULL;
2987         mode_t and_bits;
2988         mode_t or_bits;
2989
2990         if (ace_count != 3) {
2991                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2992                          "entries for file %s to convert to posix perms.\n",
2993                          fsp_str_dbg(fsp)));
2994                 return False;
2995         }
2996
2997         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2998                 if (ace_p->owner_type == UID_ACE)
2999                         owner_ace = ace_p;
3000                 else if (ace_p->owner_type == GID_ACE)
3001                         group_ace = ace_p;
3002                 else if (ace_p->owner_type == WORLD_ACE)
3003                         other_ace = ace_p;
3004         }
3005
3006         if (!owner_ace || !group_ace || !other_ace) {
3007                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3008                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3009                 return False;
3010         }
3011
3012         *posix_perms = (mode_t)0;
3013
3014         *posix_perms |= owner_ace->perms;
3015         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3016         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3017         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3018         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3019         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3020         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3021
3022         /* The owner must have at least read access. */
3023
3024         *posix_perms |= S_IRUSR;
3025         if (fsp->is_directory)
3026                 *posix_perms |= (S_IWUSR|S_IXUSR);
3027
3028         /* If requested apply the masks. */
3029
3030         /* Get the initial bits to apply. */
3031
3032         if (fsp->is_directory) {
3033                 and_bits = lp_dir_security_mask(snum);
3034                 or_bits = lp_force_dir_security_mode(snum);
3035         } else {
3036                 and_bits = lp_security_mask(snum);
3037                 or_bits = lp_force_security_mode(snum);
3038         }
3039
3040         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3041
3042         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3043                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3044                   (int)group_ace->perms, (int)other_ace->perms,
3045                   (int)*posix_perms, fsp_str_dbg(fsp)));
3046
3047         return True;
3048 }
3049
3050 /****************************************************************************
3051   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3052   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3053   with CI|OI set so it is inherited and also applies to the directory.
3054   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3055 ****************************************************************************/
3056
3057 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3058 {
3059         size_t i, j;
3060
3061         for (i = 0; i < num_aces; i++) {
3062                 for (j = i+1; j < num_aces; j++) {
3063                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3064                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3065                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3066                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3067
3068                         /* We know the lower number ACE's are file entries. */
3069                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3070                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3071                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3072                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3073                                 (i_inh == j_inh) &&
3074                                 (i_flags_ni == 0) &&
3075                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3076                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3077                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3078                                 /*
3079                                  * W2K wants to have access allowed zero access ACE's
3080                                  * at the end of the list. If the mask is zero, merge
3081                                  * the non-inherited ACE onto the inherited ACE.
3082                                  */
3083
3084                                 if (nt_ace_list[i].access_mask == 0) {
3085                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3086                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3087                                         if (num_aces - i - 1 > 0)
3088                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3089                                                                 sizeof(struct security_ace));
3090
3091                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3092                                                 (unsigned int)i, (unsigned int)j ));
3093                                 } else {
3094                                         /*
3095                                          * These are identical except for the flags.
3096                                          * Merge the inherited ACE onto the non-inherited ACE.
3097                                          */
3098
3099                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3100                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3101                                         if (num_aces - j - 1 > 0)
3102                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3103                                                                 sizeof(struct security_ace));
3104
3105                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3106                                                 (unsigned int)j, (unsigned int)i ));
3107                                 }
3108                                 num_aces--;
3109                                 break;
3110                         }
3111                 }
3112         }
3113
3114         return num_aces;
3115 }
3116
3117 /*
3118  * Add or Replace ACE entry.
3119  * In some cases we need to add a specific ACE for compatibility reasons.
3120  * When doing that we must make sure we are not actually creating a duplicate
3121  * entry. So we need to search whether an ACE entry already exist and eventually
3122  * replacce the access mask, or add a completely new entry if none was found.
3123  *
3124  * This function assumes the array has enough space to add a new entry without
3125  * any reallocation of memory.
3126  */
3127
3128 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3129                                 const struct dom_sid *sid, enum security_ace_type type,
3130                                 uint32_t mask, uint8_t flags)
3131 {
3132         int i;
3133
3134         /* first search for a duplicate */
3135         for (i = 0; i < *num_aces; i++) {
3136                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3137                     (nt_ace_list[i].flags == flags)) break;
3138         }
3139
3140         if (i < *num_aces) { /* found */
3141                 nt_ace_list[i].type = type;
3142                 nt_ace_list[i].access_mask = mask;
3143                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3144                            i, sid_string_dbg(sid), flags));
3145                 return;
3146         }
3147
3148         /* not found, append it */
3149         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3150 }
3151
3152
3153 /****************************************************************************
3154  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3155  the space for the return elements and returns the size needed to return the
3156  security descriptor. This should be the only external function needed for
3157  the UNIX style get ACL.
3158 ****************************************************************************/
3159
3160 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3161                                       const char *name,
3162                                       const SMB_STRUCT_STAT *sbuf,
3163                                       struct pai_val *pal,
3164                                       SMB_ACL_T posix_acl,
3165                                       SMB_ACL_T def_acl,
3166                                       uint32_t security_info,
3167                                       struct security_descriptor **ppdesc)
3168 {
3169         struct dom_sid owner_sid;
3170         struct dom_sid group_sid;
3171         size_t sd_size = 0;
3172         struct security_acl *psa = NULL;
3173         size_t num_acls = 0;
3174         size_t num_def_acls = 0;
3175         size_t num_aces = 0;
3176         canon_ace *file_ace = NULL;
3177         canon_ace *dir_ace = NULL;
3178         struct security_ace *nt_ace_list = NULL;
3179         size_t num_profile_acls = 0;
3180         struct dom_sid orig_owner_sid;
3181         struct security_descriptor *psd = NULL;
3182         int i;
3183
3184         /*
3185          * Get the owner, group and world SIDs.
3186          */
3187
3188         create_file_sids(sbuf, &owner_sid, &group_sid);
3189
3190         if (lp_profile_acls(SNUM(conn))) {
3191                 /* For WXP SP1 the owner must be administrators. */
3192                 sid_copy(&orig_owner_sid, &owner_sid);
3193                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3194                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3195                 num_profile_acls = 3;
3196         }
3197
3198         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3199
3200                 /*
3201                  * In the optimum case Creator Owner and Creator Group would be used for
3202                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3203                  * would lead to usability problems under Windows: The Creator entries
3204                  * are only available in browse lists of directories and not for files;
3205                  * additionally the identity of the owning group couldn't be determined.
3206                  * We therefore use those identities only for Default ACLs.
3207                  */
3208
3209                 /* Create the canon_ace lists. */
3210                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3211                                             &owner_sid, &group_sid, pal,
3212                                             SMB_ACL_TYPE_ACCESS);
3213
3214                 /* We must have *some* ACLS. */
3215
3216                 if (count_canon_ace_list(file_ace) == 0) {
3217                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3218                         goto done;
3219                 }
3220
3221                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3222                         dir_ace = canonicalise_acl(conn, name, def_acl,
3223                                                    sbuf,
3224                                                    &global_sid_Creator_Owner,
3225                                                    &global_sid_Creator_Group,
3226                                                    pal, SMB_ACL_TYPE_DEFAULT);
3227                 }
3228
3229                 /*
3230                  * Create the NT ACE list from the canonical ace lists.
3231                  */
3232
3233                 {
3234                         canon_ace *ace;
3235                         enum security_ace_type nt_acl_type;
3236
3237                         if (nt4_compatible_acls() && dir_ace) {
3238                                 /*
3239                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3240                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3241                                  * remove entries from the Access ACL if the
3242                                  * corresponding Default ACL entries have also been
3243                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3244                                  * are exceptions. We can do nothing
3245                                  * intelligent if the Default ACL contains entries that
3246                                  * are not also contained in the Access ACL, so this
3247                                  * case will still fail under NT 4.
3248                                  */
3249
3250                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3251                                 if (ace && !ace->perms) {
3252                                         DLIST_REMOVE(dir_ace, ace);
3253                                         TALLOC_FREE(ace);
3254
3255                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3256                                         if (ace && !ace->perms) {
3257                                                 DLIST_REMOVE(file_ace, ace);
3258                                                 TALLOC_FREE(ace);
3259                                         }
3260                                 }
3261
3262                                 /*
3263                                  * WinNT doesn't usually have Creator Group
3264                                  * in browse lists, so we send this entry to
3265                                  * WinNT even if it contains no relevant
3266                                  * permissions. Once we can add
3267                                  * Creator Group to browse lists we can
3268                                  * re-enable this.
3269                                  */
3270
3271 #if 0
3272                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3273                                 if (ace && !ace->perms) {
3274                                         DLIST_REMOVE(dir_ace, ace);
3275                                         TALLOC_FREE(ace);
3276                                 }
3277 #endif
3278
3279                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3280                                 if (ace && !ace->perms) {
3281                                         DLIST_REMOVE(file_ace, ace);
3282                                         TALLOC_FREE(ace);
3283                                 }
3284                         }
3285
3286                         num_acls = count_canon_ace_list(file_ace);
3287                         num_def_acls = count_canon_ace_list(dir_ace);
3288
3289                         /* Allocate the ace list. */
3290                         if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3291                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3292                                 goto done;
3293                         }
3294
3295                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3296
3297                         /*
3298                          * Create the NT ACE list from the canonical ace lists.
3299                          */
3300
3301                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3302                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3303                                                 &nt_acl_type,
3304                                                 ace->perms,
3305                                                 S_ISDIR(sbuf->st_ex_mode));
3306                                 init_sec_ace(&nt_ace_list[num_aces++],
3307                                         &ace->trustee,
3308                                         nt_acl_type,
3309                                         acc,
3310                                         ace->ace_flags);
3311                         }
3312
3313                         /* The User must have access to a profile share - even
3314                          * if we can't map the SID. */
3315                         if (lp_profile_acls(SNUM(conn))) {
3316                                 add_or_replace_ace(nt_ace_list, &num_aces,
3317                                                    &global_sid_Builtin_Users,
3318                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3319                                                    FILE_GENERIC_ALL, 0);
3320                         }
3321
3322                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3323                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3324                                                 &nt_acl_type,
3325                                                 ace->perms,
3326                                                 S_ISDIR(sbuf->st_ex_mode));
3327                                 init_sec_ace(&nt_ace_list[num_aces++],
3328                                         &ace->trustee,
3329                                         nt_acl_type,
3330                                         acc,
3331                                         ace->ace_flags |
3332                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3333                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3334                                         SEC_ACE_FLAG_INHERIT_ONLY);
3335                         }
3336
3337                         /* The User must have access to a profile share - even
3338                          * if we can't map the SID. */
3339                         if (lp_profile_acls(SNUM(conn))) {
3340                                 add_or_replace_ace(nt_ace_list, &num_aces,
3341                                                 &global_sid_Builtin_Users,
3342                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3343                                                 FILE_GENERIC_ALL,
3344                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3345                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3346                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3347                         }
3348
3349                         /*
3350                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3351                          * Win2K needs this to get the inheritance correct when replacing ACLs
3352                          * on a directory tree. Based on work by Jim @ IBM.
3353                          */
3354
3355                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3356
3357                         if (lp_profile_acls(SNUM(conn))) {
3358                                 for (i = 0; i < num_aces; i++) {
3359                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3360                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3361                                                                    &orig_owner_sid,
3362                                                                    nt_ace_list[i].type,
3363                                                                    nt_ace_list[i].access_mask,
3364                                                                    nt_ace_list[i].flags);
3365                                                 break;
3366                                         }
3367                                 }
3368                         }
3369                 }
3370
3371                 if (num_aces) {
3372                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3373                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3374                                 goto done;
3375                         }
3376                 }
3377         } /* security_info & SECINFO_DACL */
3378
3379         psd = make_standard_sec_desc( talloc_tos(),
3380                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3381                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3382                         psa,
3383                         &sd_size);
3384
3385         if(!psd) {
3386                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3387                 sd_size = 0;
3388                 goto done;
3389         }
3390
3391         /*
3392          * Windows 2000: The DACL_PROTECTED flag in the security
3393          * descriptor marks the ACL as non-inheriting, i.e., no
3394          * ACEs from higher level directories propagate to this
3395          * ACL. In the POSIX ACL model permissions are only
3396          * inherited at file create time, so ACLs never contain
3397          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3398          * flag doesn't seem to bother Windows NT.
3399          * Always set this if map acl inherit is turned off.
3400          */
3401         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3402                 psd->type |= SEC_DESC_DACL_PROTECTED;
3403         } else {
3404                 psd->type |= pal->sd_type;
3405         }
3406
3407         if (psd->dacl) {
3408                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3409         }
3410
3411         *ppdesc = psd;
3412
3413  done:
3414
3415         if (posix_acl) {
3416                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3417         }
3418         if (def_acl) {
3419                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3420         }
3421         free_canon_ace_list(file_ace);
3422         free_canon_ace_list(dir_ace);
3423         free_inherited_info(pal);
3424         TALLOC_FREE(nt_ace_list);
3425
3426         return NT_STATUS_OK;
3427 }
3428
3429 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3430                            struct security_descriptor **ppdesc)
3431 {
3432         SMB_STRUCT_STAT sbuf;
3433         SMB_ACL_T posix_acl = NULL;
3434         struct pai_val *pal;
3435
3436         *ppdesc = NULL;
3437
3438         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3439                   fsp_str_dbg(fsp)));
3440
3441         /* can it happen that fsp_name == NULL ? */
3442         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3443                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3444                                         security_info, ppdesc);
3445         }
3446
3447         /* Get the stat struct for the owner info. */
3448         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3449                 return map_nt_error_from_unix(errno);
3450         }
3451
3452         /* Get the ACL from the fd. */
3453         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3454
3455         pal = fload_inherited_info(fsp);
3456
3457         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3458                                        &sbuf, pal, posix_acl, NULL,
3459                                        security_info, ppdesc);
3460 }
3461
3462 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3463                           uint32_t security_info, struct security_descriptor **ppdesc)
3464 {
3465         SMB_ACL_T posix_acl = NULL;
3466         SMB_ACL_T def_acl = NULL;
3467         struct pai_val *pal;
3468         struct smb_filename smb_fname;
3469         int ret;
3470
3471         *ppdesc = NULL;
3472
3473         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3474
3475         ZERO_STRUCT(smb_fname);
3476         smb_fname.base_name = discard_const_p(char, name);
3477
3478         /* Get the stat struct for the owner info. */
3479         if (lp_posix_pathnames()) {
3480                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3481         } else {
3482                 ret = SMB_VFS_STAT(conn, &smb_fname);
3483         }
3484
3485         if (ret == -1) {
3486                 return map_nt_error_from_unix(errno);
3487         }
3488
3489         /* Get the ACL from the path. */
3490         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3491
3492         /* If it's a directory get the default POSIX ACL. */
3493         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3494                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3495                 def_acl = free_empty_sys_acl(conn, def_acl);
3496         }
3497
3498         pal = load_inherited_info(conn, name);
3499
3500         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3501                                        posix_acl, def_acl, security_info,
3502                                        ppdesc);
3503 }
3504
3505 /****************************************************************************
3506  Try to chown a file. We will be able to chown it under the following conditions.
3507
3508   1) If we have root privileges, then it will just work.
3509   2) If we have SeRestorePrivilege we can change the user + group to any other user.
3510   3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3511   4) If we have write permission to the file and dos_filemodes is set
3512      then allow chown to the currently authenticated user.
3513 ****************************************************************************/
3514
3515 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3516 {
3517         NTSTATUS status;
3518
3519         if(!CAN_WRITE(fsp->conn)) {
3520                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3521         }
3522
3523         /* Case (1). */
3524         status = vfs_chown_fsp(fsp, uid, gid);
3525         if (NT_STATUS_IS_OK(status)) {
3526                 return status;
3527         }
3528
3529         /* Case (2) / (3) */
3530         if (lp_enable_privileges()) {
3531                 bool has_take_ownership_priv = security_token_has_privilege(
3532                                                 get_current_nttok(fsp->conn),
3533                                                 SEC_PRIV_TAKE_OWNERSHIP);
3534                 bool has_restore_priv = security_token_has_privilege(
3535                                                 get_current_nttok(fsp->conn),
3536                                                 SEC_PRIV_RESTORE);
3537
3538                 if (has_restore_priv) {
3539                         ; /* Case (2) */
3540                 } else if (has_take_ownership_priv) {
3541                         /* Case (3) */
3542                         if (uid == get_current_uid(fsp->conn)) {
3543                                 gid = (gid_t)-1;
3544                         } else {
3545                                 has_take_ownership_priv = false;
3546                         }
3547                 }
3548
3549                 if (has_take_ownership_priv || has_restore_priv) {
3550                         become_root();
3551                         status = vfs_chown_fsp(fsp, uid, gid);
3552                         unbecome_root();
3553                         return status;
3554                 }
3555         }
3556
3557         /* Case (4). */
3558         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3559                 return NT_STATUS_ACCESS_DENIED;
3560         }
3561
3562         /* only allow chown to the current user. This is more secure,
3563            and also copes with the case where the SID in a take ownership ACL is
3564            a local SID on the users workstation
3565         */
3566         if (uid != get_current_uid(fsp->conn)) {
3567                 return NT_STATUS_ACCESS_DENIED;
3568         }
3569
3570         become_root();
3571         /* Keep the current file gid the same. */
3572         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3573         unbecome_root();
3574
3575         return status;
3576 }
3577
3578 #if 0
3579 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3580
3581 /****************************************************************************
3582  Take care of parent ACL inheritance.
3583 ****************************************************************************/
3584
3585 NTSTATUS append_parent_acl(files_struct *fsp,
3586                                 const struct security_descriptor *pcsd,
3587                                 struct security_descriptor **pp_new_sd)
3588 {
3589         struct smb_filename *smb_dname = NULL;
3590         struct security_descriptor *parent_sd = NULL;
3591         files_struct *parent_fsp = NULL;
3592         TALLOC_CTX *mem_ctx = talloc_tos();
3593         char *parent_name = NULL;
3594         struct security_ace *new_ace = NULL;
3595         unsigned int num_aces = pcsd->dacl->num_aces;
3596         NTSTATUS status;
3597         int info;
3598         unsigned int i, j;
3599         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3600         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3601
3602         if (psd == NULL) {
3603                 return NT_STATUS_NO_MEMORY;
3604         }
3605
3606         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3607                             NULL)) {
3608                 return NT_STATUS_NO_MEMORY;
3609         }
3610
3611         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3612                                             &smb_dname);
3613         if (!NT_STATUS_IS_OK(status)) {
3614                 goto fail;
3615         }
3616
3617         status = SMB_VFS_CREATE_FILE(
3618                 fsp->conn,                              /* conn */
3619                 NULL,                                   /* req */
3620                 0,                                      /* root_dir_fid */
3621                 smb_dname,                              /* fname */
3622                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3623                 FILE_SHARE_NONE,                        /* share_access */
3624                 FILE_OPEN,                              /* create_disposition*/
3625                 FILE_DIRECTORY_FILE,                    /* create_options */
3626                 0,                                      /* file_attributes */
3627                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3628                 0,                                      /* allocation_size */
3629                 NULL,                                   /* sd */
3630                 NULL,                                   /* ea_list */
3631                 &parent_fsp,                            /* result */
3632                 &info);                                 /* pinfo */
3633
3634         if (!NT_STATUS_IS_OK(status)) {
3635                 TALLOC_FREE(smb_dname);
3636                 return status;
3637         }
3638
3639         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3640                                     SECINFO_DACL, &parent_sd );
3641
3642         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3643         TALLOC_FREE(smb_dname);
3644
3645         if (!NT_STATUS_IS_OK(status)) {
3646                 return status;
3647         }
3648
3649         /*
3650          * Make room for potentially all the ACLs from
3651          * the parent. We used to add the ugw triple here,
3652          * as we knew we were dealing with POSIX ACLs.
3653          * We no longer need to do so as we can guarentee
3654          * that a default ACL from the parent directory will
3655          * be well formed for POSIX ACLs if it came from a
3656          * POSIX ACL source, and if we're not writing to a
3657          * POSIX ACL sink then we don't care if it's not well
3658          * formed. JRA.
3659          */
3660
3661         num_aces += parent_sd->dacl->num_aces;
3662
3663         if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3664                                         num_aces)) == NULL) {
3665                 return NT_STATUS_NO_MEMORY;
3666         }
3667
3668         /* Start by copying in all the given ACE entries. */
3669         for (i = 0; i < psd->dacl->num_aces; i++) {
3670                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3671         }
3672
3673         /*
3674          * Note that we're ignoring "inherit permissions" here
3675          * as that really only applies to newly created files. JRA.
3676          */
3677
3678         /* Finally append any inherited ACEs. */
3679         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3680                 struct security_ace *se = &parent_sd->dacl->aces[j];
3681
3682                 if (fsp->is_directory) {
3683                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3684                                 /* Doesn't apply to a directory - ignore. */
3685                                 DEBUG(10,("append_parent_acl: directory %s "
3686                                         "ignoring non container "
3687                                         "inherit flags %u on ACE with sid %s "
3688                                         "from parent %s\n",
3689                                         fsp_str_dbg(fsp),
3690                                         (unsigned int)se->flags,
3691                                         sid_string_dbg(&se->trustee),
3692                                         parent_name));
3693                                 continue;
3694                         }
3695                 } else {
3696                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3697                                 /* Doesn't apply to a file - ignore. */
3698                                 DEBUG(10,("append_parent_acl: file %s "
3699                                         "ignoring non object "
3700                                         "inherit flags %u on ACE with sid %s "
3701                                         "from parent %s\n",
3702                                         fsp_str_dbg(fsp),
3703                                         (unsigned int)se->flags,
3704                                         sid_string_dbg(&se->trustee),
3705                                         parent_name));
3706                                 continue;
3707                         }
3708                 }
3709
3710                 if (is_dacl_protected) {
3711                         /* If the DACL is protected it means we must
3712                          * not overwrite an existing ACE entry with the
3713                          * same SID. This is order N^2. Ouch :-(. JRA. */
3714                         unsigned int k;
3715                         for (k = 0; k < psd->dacl->num_aces; k++) {
3716                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3717                                                 &se->trustee)) {
3718                                         break;
3719                                 }
3720                         }
3721                         if (k < psd->dacl->num_aces) {
3722                                 /* SID matched. Ignore. */
3723                                 DEBUG(10,("append_parent_acl: path %s "
3724                                         "ignoring ACE with protected sid %s "
3725                                         "from parent %s\n",
3726                                         fsp_str_dbg(fsp),
3727                                         sid_string_dbg(&se->trustee),
3728                                         parent_name));
3729                                 continue;
3730                         }
3731                 }
3732
3733                 sec_ace_copy(&new_ace[i], se);
3734                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3735                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3736                 }
3737                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3738
3739                 if (fsp->is_directory) {
3740                         /*
3741                          * Strip off any inherit only. It's applied.
3742                          */
3743                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3744                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3745                                 /* No further inheritance. */
3746                                 new_ace[i].flags &=
3747                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3748                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3749                         }
3750                 } else {
3751                         /*
3752                          * Strip off any container or inherit
3753                          * flags, they can't apply to objects.
3754                          */
3755                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3756                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3757                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3758                 }
3759                 i++;
3760
3761                 DEBUG(10,("append_parent_acl: path %s "
3762                         "inheriting ACE with sid %s "
3763                         "from parent %s\n",
3764                         fsp_str_dbg(fsp),
3765                         sid_string_dbg(&se->trustee),
3766                         parent_name));
3767         }
3768
3769         psd->dacl->aces = new_ace;
3770         psd->dacl->num_aces = i;
3771         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3772                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
3773
3774         *pp_new_sd = psd;
3775         return status;
3776 }
3777 #endif
3778
3779 /****************************************************************************
3780  Reply to set a security descriptor on an fsp. security_info_sent is the
3781  description of the following NT ACL.
3782  This should be the only external function needed for the UNIX style set ACL.
3783  We make a copy of psd_orig as internal functions modify the elements inside
3784  it, even though it's a const pointer.
3785 ****************************************************************************/
3786
3787 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3788 {
3789         connection_struct *conn = fsp->conn;
3790         uid_t user = (uid_t)-1;
3791         gid_t grp = (gid_t)-1;
3792         struct dom_sid file_owner_sid;
3793         struct dom_sid file_grp_sid;
3794         canon_ace *file_ace_list = NULL;
3795         canon_ace *dir_ace_list = NULL;
3796         bool acl_perms = False;
3797         mode_t orig_mode = (mode_t)0;
3798         NTSTATUS status;
3799         bool set_acl_as_root = false;
3800         bool acl_set_support = false;
3801         bool ret = false;
3802         struct security_descriptor *psd = NULL;
3803
3804         DEBUG(10,("set_nt_acl: called for file %s\n",
3805                   fsp_str_dbg(fsp)));
3806
3807         if (!CAN_WRITE(conn)) {
3808                 DEBUG(10,("set acl rejected on read-only share\n"));
3809                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3810         }
3811
3812         if (!psd_orig) {
3813                 return NT_STATUS_INVALID_PARAMETER;
3814         }
3815
3816         psd = dup_sec_desc(talloc_tos(), psd_orig);
3817         if (!psd) {
3818                 return NT_STATUS_NO_MEMORY;
3819         }
3820
3821         /*
3822          * Get the current state of the file.
3823          */
3824
3825         status = vfs_stat_fsp(fsp);
3826         if (!NT_STATUS_IS_OK(status)) {
3827                 return status;
3828         }
3829
3830         /* Save the original element we check against. */
3831         orig_mode = fsp->fsp_name->st.st_ex_mode;
3832
3833         /*
3834          * Unpack the user/group/world id's.
3835          */
3836
3837         /* POSIX can't cope with missing owner/group. */
3838         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3839                 security_info_sent &= ~SECINFO_OWNER;
3840         }
3841         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3842                 security_info_sent &= ~SECINFO_GROUP;
3843         }
3844
3845         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3846         if (!NT_STATUS_IS_OK(status)) {
3847                 return status;
3848         }
3849
3850         /*
3851          * Do we need to chown ? If so this must be done first as the incoming
3852          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3853          * Noticed by Simo.
3854          */
3855
3856         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3857             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3858
3859                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3860                          fsp_str_dbg(fsp), (unsigned int)user,
3861                          (unsigned int)grp));
3862
3863                 status = try_chown(fsp, user, grp);
3864                 if(!NT_STATUS_IS_OK(status)) {
3865                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3866                                 "= %s.\n", fsp_str_dbg(fsp),
3867                                 (unsigned int)user,
3868                                 (unsigned int)grp,
3869                                 nt_errstr(status)));
3870                         return status;
3871                 }
3872
3873                 /*
3874                  * Recheck the current state of the file, which may have changed.
3875                  * (suid/sgid bits, for instance)
3876                  */
3877
3878                 status = vfs_stat_fsp(fsp);
3879                 if (!NT_STATUS_IS_OK(status)) {
3880                         return status;
3881                 }
3882
3883                 /* Save the original element we check against. */
3884                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3885
3886                 /* If we successfully chowned, we know we must
3887                  * be able to set the acl, so do it as root.
3888                  */
3889                 set_acl_as_root = true;
3890         }
3891
3892         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3893
3894         if((security_info_sent & SECINFO_DACL) &&
3895                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3896                         (psd->dacl == NULL)) {
3897                 struct security_ace ace[3];
3898
3899                 /* We can't have NULL DACL in POSIX.
3900                    Use owner/group/Everyone -> full access. */
3901
3902                 init_sec_ace(&ace[0],
3903                                 &file_owner_sid,
3904                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3905                                 GENERIC_ALL_ACCESS,
3906                                 0);
3907                 init_sec_ace(&ace[1],
3908                                 &file_grp_sid,
3909                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3910                                 GENERIC_ALL_ACCESS,
3911                                 0);
3912                 init_sec_ace(&ace[2],
3913                                 &global_sid_World,
3914                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3915                                 GENERIC_ALL_ACCESS,
3916                                 0);
3917                 psd->dacl = make_sec_acl(talloc_tos(),
3918                                         NT4_ACL_REVISION,
3919                                         3,
3920                                         ace);
3921                 if (psd->dacl == NULL) {
3922                         return NT_STATUS_NO_MEMORY;
3923                 }
3924                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3925         }
3926
3927         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3928                                      &file_grp_sid, &file_ace_list,
3929                                      &dir_ace_list, security_info_sent, psd);
3930
3931         /* Ignore W2K traverse DACL set. */
3932         if (!file_ace_list && !dir_ace_list) {
3933                 return NT_STATUS_OK;
3934         }
3935
3936         if (!acl_perms) {
3937                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3938                 free_canon_ace_list(file_ace_list);
3939                 free_canon_ace_list(dir_ace_list);
3940                 return NT_STATUS_ACCESS_DENIED;
3941         }
3942
3943         /*
3944          * Only change security if we got a DACL.
3945          */
3946
3947         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3948                 free_canon_ace_list(file_ace_list);
3949                 free_canon_ace_list(dir_ace_list);
3950                 return NT_STATUS_OK;
3951         }
3952
3953         /*
3954          * Try using the POSIX ACL set first. Fall back to chmod if
3955          * we have no ACL support on this filesystem.
3956          */
3957
3958         if (acl_perms && file_ace_list) {
3959                 if (set_acl_as_root) {
3960                         become_root();
3961                 }
3962                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3963                                          &fsp->fsp_name->st, &acl_set_support);
3964                 if (set_acl_as_root) {
3965                         unbecome_root();
3966                 }
3967                 if (acl_set_support && ret == false) {
3968                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3969                                  "%s (%s).\n", fsp_str_dbg(fsp),
3970                                  strerror(errno)));
3971                         free_canon_ace_list(file_ace_list);
3972                         free_canon_ace_list(dir_ace_list);
3973                         return map_nt_error_from_unix(errno);
3974                 }
3975         }
3976
3977         if (acl_perms && acl_set_support && fsp->is_directory) {
3978                 if (dir_ace_list) {
3979                         if (set_acl_as_root) {
3980                                 become_root();
3981                         }
3982                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
3983                                                  &fsp->fsp_name->st,
3984                                                  &acl_set_support);
3985                         if (set_acl_as_root) {
3986                                 unbecome_root();
3987                         }
3988                         if (ret == false) {
3989                                 DEBUG(3,("set_nt_acl: failed to set default "
3990                                          "acl on directory %s (%s).\n",
3991                                          fsp_str_dbg(fsp), strerror(errno)));
3992                                 free_canon_ace_list(file_ace_list);
3993                                 free_canon_ace_list(dir_ace_list);
3994                                 return map_nt_error_from_unix(errno);
3995                         }
3996                 } else {
3997                         int sret = -1;
3998
3999                         /*
4000                          * No default ACL - delete one if it exists.
4001                          */
4002
4003                         if (set_acl_as_root) {
4004                                 become_root();
4005                         }
4006                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4007                             fsp->fsp_name->base_name);
4008                         if (set_acl_as_root) {
4009                                 unbecome_root();
4010                         }
4011                         if (sret == -1) {
4012                                 if (acl_group_override(conn, fsp->fsp_name)) {
4013                                         DEBUG(5,("set_nt_acl: acl group "
4014                                                  "control on and current user "
4015                                                  "in file %s primary group. "
4016                                                  "Override delete_def_acl\n",
4017                                                  fsp_str_dbg(fsp)));
4018
4019                                         become_root();
4020                                         sret =
4021                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4022                                                     conn,
4023                                                     fsp->fsp_name->base_name);
4024                                         unbecome_root();
4025                                 }
4026
4027                                 if (sret == -1) {
4028                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4029                                         free_canon_ace_list(file_ace_list);
4030                                         free_canon_ace_list(dir_ace_list);
4031                                         return map_nt_error_from_unix(errno);
4032                                 }
4033                         }
4034                 }
4035         }
4036
4037         if (acl_set_support) {
4038                 if (set_acl_as_root) {
4039                         become_root();
4040                 }
4041                 store_inheritance_attributes(fsp,
4042                                 file_ace_list,
4043                                 dir_ace_list,
4044                                 psd->type);
4045                 if (set_acl_as_root) {
4046                         unbecome_root();
4047                 }
4048         }
4049
4050         /*
4051          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4052          */
4053
4054         if(!acl_set_support && acl_perms) {
4055                 mode_t posix_perms;
4056
4057                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4058                         free_canon_ace_list(file_ace_list);
4059                         free_canon_ace_list(dir_ace_list);
4060                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4061                                  "posix permissions for file %s.\n",
4062                                  fsp_str_dbg(fsp)));
4063                         return NT_STATUS_ACCESS_DENIED;
4064                 }
4065
4066                 if (orig_mode != posix_perms) {
4067                         int sret = -1;
4068
4069                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4070                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4071
4072                         if (set_acl_as_root) {
4073                                 become_root();
4074                         }
4075                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4076                                              posix_perms);
4077                         if (set_acl_as_root) {
4078                                 unbecome_root();
4079                         }
4080                         if(sret == -1) {
4081                                 if (acl_group_override(conn, fsp->fsp_name)) {
4082                                         DEBUG(5,("set_nt_acl: acl group "
4083                                                  "control on and current user "
4084                                                  "in file %s primary group. "
4085                                                  "Override chmod\n",
4086                                                  fsp_str_dbg(fsp)));
4087
4088                                         become_root();
4089                                         sret = SMB_VFS_CHMOD(conn,
4090                                             fsp->fsp_name->base_name,
4091                                             posix_perms);
4092                                         unbecome_root();
4093                                 }
4094
4095                                 if (sret == -1) {
4096                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4097                                                  "failed. Error = %s.\n",
4098                                                  fsp_str_dbg(fsp),
4099                                                  (unsigned int)posix_perms,
4100                                                  strerror(errno)));
4101                                         free_canon_ace_list(file_ace_list);
4102                                         free_canon_ace_list(dir_ace_list);
4103                                         return map_nt_error_from_unix(errno);
4104                                 }
4105                         }
4106                 }
4107         }
4108
4109         free_canon_ace_list(file_ace_list);
4110         free_canon_ace_list(dir_ace_list);
4111
4112         /* Ensure the stat struct in the fsp is correct. */
4113         status = vfs_stat_fsp(fsp);
4114
4115         return NT_STATUS_OK;
4116 }
4117
4118 /****************************************************************************
4119  Get the actual group bits stored on a file with an ACL. Has no effect if
4120  the file has no ACL. Needed in dosmode code where the stat() will return
4121  the mask bits, not the real group bits, for a file with an ACL.
4122 ****************************************************************************/
4123
4124 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4125 {
4126         int entry_id = SMB_ACL_FIRST_ENTRY;
4127         SMB_ACL_ENTRY_T entry;
4128         SMB_ACL_T posix_acl;
4129         int result = -1;
4130
4131         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4132         if (posix_acl == (SMB_ACL_T)NULL)
4133                 return -1;
4134
4135         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4136                 SMB_ACL_TAG_T tagtype;
4137                 SMB_ACL_PERMSET_T permset;
4138
4139                 entry_id = SMB_ACL_NEXT_ENTRY;
4140
4141                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4142                         break;
4143
4144                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4145                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4146                                 break;
4147                         } else {
4148                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4149                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4150                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4151                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4152                                 result = 0;
4153                                 break;
4154                         }
4155                 }
4156         }
4157         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4158         return result;
4159 }
4160
4161 /****************************************************************************
4162  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4163  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4164 ****************************************************************************/
4165
4166 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4167 {
4168         int entry_id = SMB_ACL_FIRST_ENTRY;
4169         SMB_ACL_ENTRY_T entry;
4170         int num_entries = 0;
4171
4172         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4173                 SMB_ACL_TAG_T tagtype;
4174                 SMB_ACL_PERMSET_T permset;
4175                 mode_t perms;
4176
4177                 entry_id = SMB_ACL_NEXT_ENTRY;
4178
4179                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4180                         return -1;
4181
4182                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4183                         return -1;
4184
4185                 num_entries++;
4186
4187                 switch(tagtype) {
4188                         case SMB_ACL_USER_OBJ:
4189                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4190                                 break;
4191                         case SMB_ACL_GROUP_OBJ:
4192                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4193                                 break;
4194                         case SMB_ACL_MASK:
4195                                 /*
4196                                  * FIXME: The ACL_MASK entry permissions should really be set to
4197                                  * the union of the permissions of all ACL_USER,
4198                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4199                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4200                                  */
4201                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4202                                 break;
4203                         case SMB_ACL_OTHER:
4204                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4205                                 break;
4206                         default:
4207                                 continue;
4208                 }
4209
4210                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4211                         return -1;
4212
4213                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4214                         return -1;
4215         }
4216
4217         /*
4218          * If this is a simple 3 element ACL or no elements then it's a standard
4219          * UNIX permission set. Just use chmod...
4220          */
4221
4222         if ((num_entries == 3) || (num_entries == 0))
4223                 return -1;
4224
4225         return 0;
4226 }
4227
4228 /****************************************************************************
4229  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4230  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4231  resulting ACL on TO.  Note that name is in UNIX character set.
4232 ****************************************************************************/
4233
4234 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4235 {
4236         SMB_ACL_T posix_acl = NULL;
4237         int ret = -1;
4238
4239         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4240                 return -1;
4241
4242         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4243                 goto done;
4244
4245         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4246
4247  done:
4248
4249         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4250         return ret;
4251 }
4252
4253 /****************************************************************************
4254  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4255  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4256  Note that name is in UNIX character set.
4257 ****************************************************************************/
4258
4259 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4260 {
4261         return copy_access_posix_acl(conn, name, name, mode);
4262 }
4263
4264 /****************************************************************************
4265  Check for an existing default POSIX ACL on a directory.
4266 ****************************************************************************/
4267
4268 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4269 {
4270         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4271         bool has_acl = False;
4272         SMB_ACL_ENTRY_T entry;
4273
4274         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4275                 has_acl = True;
4276         }
4277
4278         if (def_acl) {
4279                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4280         }
4281         return has_acl;
4282 }
4283
4284 /****************************************************************************
4285  If the parent directory has no default ACL but it does have an Access ACL,
4286  inherit this Access ACL to file name.
4287 ****************************************************************************/
4288
4289 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4290                        const char *name, mode_t mode)
4291 {
4292         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4293                 return 0;
4294
4295         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4296 }
4297
4298 /****************************************************************************
4299  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4300  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4301 ****************************************************************************/
4302
4303 int fchmod_acl(files_struct *fsp, mode_t mode)
4304 {
4305         connection_struct *conn = fsp->conn;
4306         SMB_ACL_T posix_acl = NULL;
4307         int ret = -1;
4308
4309         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4310                 return -1;
4311
4312         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4313                 goto done;
4314
4315         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4316
4317   done:
4318
4319         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4320         return ret;
4321 }
4322
4323 /****************************************************************************
4324  Map from wire type to permset.
4325 ****************************************************************************/
4326
4327 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4328 {
4329         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4330                 return False;
4331         }
4332
4333         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4334                 return False;
4335         }
4336
4337         if (wire_perm & SMB_POSIX_ACL_READ) {
4338                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4339                         return False;
4340                 }
4341         }
4342         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4343                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4344                         return False;
4345                 }
4346         }
4347         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4348                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4349                         return False;
4350                 }
4351         }
4352         return True;
4353 }
4354
4355 /****************************************************************************
4356  Map from wire type to tagtype.
4357 ****************************************************************************/
4358
4359 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4360 {
4361         switch (wire_tt) {
4362                 case SMB_POSIX_ACL_USER_OBJ:
4363                         *p_tt = SMB_ACL_USER_OBJ;
4364                         break;
4365                 case SMB_POSIX_ACL_USER:
4366                         *p_tt = SMB_ACL_USER;
4367                         break;
4368                 case SMB_POSIX_ACL_GROUP_OBJ:
4369                         *p_tt = SMB_ACL_GROUP_OBJ;
4370                         break;
4371                 case SMB_POSIX_ACL_GROUP:
4372                         *p_tt = SMB_ACL_GROUP;
4373                         break;
4374                 case SMB_POSIX_ACL_MASK:
4375                         *p_tt = SMB_ACL_MASK;
4376                         break;
4377                 case SMB_POSIX_ACL_OTHER:
4378                         *p_tt = SMB_ACL_OTHER;
4379                         break;
4380                 default:
4381                         return False;
4382         }
4383         return True;
4384 }
4385
4386 /****************************************************************************
4387  Create a new POSIX acl from wire permissions.
4388  FIXME ! How does the share mask/mode fit into this.... ?
4389 ****************************************************************************/
4390
4391 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4392 {
4393         unsigned int i;
4394         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4395
4396         if (the_acl == NULL) {
4397                 return NULL;
4398         }
4399
4400         for (i = 0; i < num_acls; i++) {
4401                 SMB_ACL_ENTRY_T the_entry;
4402                 SMB_ACL_PERMSET_T the_permset;
4403                 SMB_ACL_TAG_T tag_type;
4404
4405                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4406                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4407                                 i, strerror(errno) ));
4408                         goto fail;
4409                 }
4410
4411                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4412                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4413                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4414                         goto fail;
4415                 }
4416
4417                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4418                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4419                                 i, strerror(errno) ));
4420                         goto fail;
4421                 }
4422
4423                 /* Get the permset pointer from the new ACL entry. */
4424                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4425                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4426                                 i, strerror(errno) ));
4427                         goto fail;
4428                 }
4429
4430                 /* Map from wire to permissions. */
4431                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4432                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4433                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4434                         goto fail;
4435                 }
4436
4437                 /* Now apply to the new ACL entry. */
4438                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4439                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4440                                 i, strerror(errno) ));
4441                         goto fail;
4442                 }
4443
4444                 if (tag_type == SMB_ACL_USER) {
4445                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4446                         uid_t uid = (uid_t)uidval;
4447                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4448                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4449                                         (unsigned int)uid, i, strerror(errno) ));
4450                                 goto fail;
4451                         }
4452                 }
4453
4454                 if (tag_type == SMB_ACL_GROUP) {
4455                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4456                         gid_t gid = (uid_t)gidval;
4457                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4458                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4459                                         (unsigned int)gid, i, strerror(errno) ));
4460                                 goto fail;
4461                         }
4462                 }
4463         }
4464
4465         return the_acl;
4466
4467  fail:
4468
4469         if (the_acl != NULL) {
4470                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4471         }
4472         return NULL;
4473 }
4474
4475 /****************************************************************************
4476  Calls from UNIX extensions - Default POSIX ACL set.
4477  If num_def_acls == 0 and not a directory just return. If it is a directory
4478  and num_def_acls == 0 then remove the default acl. Else set the default acl
4479  on the directory.
4480 ****************************************************************************/
4481
4482 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4483                                 uint16 num_def_acls, const char *pdata)
4484 {
4485         SMB_ACL_T def_acl = NULL;
4486
4487         if (!S_ISDIR(psbuf->st_ex_mode)) {
4488                 if (num_def_acls) {
4489                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4490                         errno = EISDIR;
4491                         return False;
4492                 } else {
4493                         return True;
4494                 }
4495         }
4496
4497         if (!num_def_acls) {
4498                 /* Remove the default ACL. */
4499                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4500                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4501                                 fname, strerror(errno) ));
4502                         return False;
4503                 }
4504                 return True;
4505         }
4506
4507         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4508                 return False;
4509         }
4510
4511         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4512                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4513                         fname, strerror(errno) ));
4514                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4515                 return False;
4516         }
4517
4518         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4519         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4520         return True;
4521 }
4522
4523 /****************************************************************************
4524  Remove an ACL from a file. As we don't have acl_delete_entry() available
4525  we must read the current acl and copy all entries except MASK, USER and GROUP
4526  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4527  removed.
4528  FIXME ! How does the share mask/mode fit into this.... ?
4529 ****************************************************************************/
4530
4531 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4532 {
4533         SMB_ACL_T file_acl = NULL;
4534         int entry_id = SMB_ACL_FIRST_ENTRY;
4535         SMB_ACL_ENTRY_T entry;
4536         bool ret = False;
4537         /* Create a new ACL with only 3 entries, u/g/w. */
4538         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4539         SMB_ACL_ENTRY_T user_ent = NULL;
4540         SMB_ACL_ENTRY_T group_ent = NULL;
4541         SMB_ACL_ENTRY_T other_ent = NULL;
4542
4543         if (new_file_acl == NULL) {
4544                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4545                 return False;
4546         }
4547
4548         /* Now create the u/g/w entries. */
4549         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4550                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4551                         fname, strerror(errno) ));
4552                 goto done;
4553         }
4554         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4555                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4556                         fname, strerror(errno) ));
4557                 goto done;
4558         }
4559
4560         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4561                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4562                         fname, strerror(errno) ));
4563                 goto done;
4564         }
4565         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4566                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4567                         fname, strerror(errno) ));
4568                 goto done;
4569         }
4570
4571         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4572                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4573                         fname, strerror(errno) ));
4574                 goto done;
4575         }
4576         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4577                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4578                         fname, strerror(errno) ));
4579                 goto done;
4580         }
4581
4582         /* Get the current file ACL. */
4583         if (fsp && fsp->fh->fd != -1) {
4584                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4585         } else {
4586                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4587         }
4588
4589         if (file_acl == NULL) {
4590                 /* This is only returned if an error occurred. Even for a file with
4591                    no acl a u/g/w acl should be returned. */
4592                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4593                         fname, strerror(errno) ));
4594                 goto done;
4595         }
4596
4597         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4598                 SMB_ACL_TAG_T tagtype;
4599                 SMB_ACL_PERMSET_T permset;
4600
4601                 entry_id = SMB_ACL_NEXT_ENTRY;
4602
4603                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4604                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4605                                 fname, strerror(errno) ));
4606                         goto done;
4607                 }
4608
4609                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4610                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4611                                 fname, strerror(errno) ));
4612                         goto done;
4613                 }
4614
4615                 if (tagtype == SMB_ACL_USER_OBJ) {
4616                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4617                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4618                                         fname, strerror(errno) ));
4619                         }
4620                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4621                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4622                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4623                                         fname, strerror(errno) ));
4624                         }
4625                 } else if (tagtype == SMB_ACL_OTHER) {
4626                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4627                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4628                                         fname, strerror(errno) ));
4629                         }
4630                 }
4631         }
4632
4633         /* Set the new empty file ACL. */
4634         if (fsp && fsp->fh->fd != -1) {
4635                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4636                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4637                                 fname, strerror(errno) ));
4638                         goto done;
4639                 }
4640         } else {
4641                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4642                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4643                                 fname, strerror(errno) ));
4644                         goto done;
4645                 }
4646         }
4647
4648         ret = True;
4649
4650  done:
4651
4652         if (file_acl) {
4653                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4654         }
4655         if (new_file_acl) {
4656                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4657         }
4658         return ret;
4659 }
4660
4661 /****************************************************************************
4662  Calls from UNIX extensions - POSIX ACL set.
4663  If num_def_acls == 0 then read/modify/write acl after removing all entries
4664  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4665 ****************************************************************************/
4666
4667 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4668 {
4669         SMB_ACL_T file_acl = NULL;
4670
4671         if (!num_acls) {
4672                 /* Remove the ACL from the file. */
4673                 return remove_posix_acl(conn, fsp, fname);
4674         }
4675
4676         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4677                 return False;
4678         }
4679
4680         if (fsp && fsp->fh->fd != -1) {
4681                 /* The preferred way - use an open fd. */
4682                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4683                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4684                                 fname, strerror(errno) ));
4685                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4686                         return False;
4687                 }
4688         } else {
4689                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4690                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4691                                 fname, strerror(errno) ));
4692                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4693                         return False;
4694                 }
4695         }
4696
4697         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4698         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4699         return True;
4700 }
4701
4702 /********************************************************************
4703  Pull the NT ACL from a file on disk or the OpenEventlog() access
4704  check.  Caller is responsible for freeing the returned security
4705  descriptor via TALLOC_FREE().  This is designed for dealing with
4706  user space access checks in smbd outside of the VFS.  For example,
4707  checking access rights in OpenEventlog().
4708
4709  Assume we are dealing with files (for now)
4710 ********************************************************************/
4711
4712 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4713 {
4714         struct security_descriptor *psd, *ret_sd;
4715         connection_struct *conn;
4716         files_struct finfo;
4717         struct fd_handle fh;
4718         NTSTATUS status;
4719
4720         conn = talloc_zero(ctx, connection_struct);
4721         if (conn == NULL) {
4722                 DEBUG(0, ("talloc failed\n"));
4723                 return NULL;
4724         }
4725
4726         if (!(conn->params = talloc(conn, struct share_params))) {
4727                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4728                 TALLOC_FREE(conn);
4729                 return NULL;
4730         }
4731
4732         conn->params->service = -1;
4733
4734         set_conn_connectpath(conn, "/");
4735
4736         if (!smbd_vfs_init(conn)) {
4737                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4738                 conn_free(conn);
4739                 return NULL;
4740         }
4741
4742         ZERO_STRUCT( finfo );
4743         ZERO_STRUCT( fh );
4744
4745         finfo.fnum = -1;
4746         finfo.conn = conn;
4747         finfo.fh = &fh;
4748         finfo.fh->fd = -1;
4749
4750         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4751                                             &finfo.fsp_name);
4752         if (!NT_STATUS_IS_OK(status)) {
4753                 conn_free(conn);
4754                 return NULL;
4755         }
4756
4757         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4758                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4759                 TALLOC_FREE(finfo.fsp_name);
4760                 conn_free(conn);
4761                 return NULL;
4762         }
4763
4764         ret_sd = dup_sec_desc( ctx, psd );
4765
4766         TALLOC_FREE(finfo.fsp_name);
4767         conn_free(conn);
4768
4769         return ret_sd;
4770 }
4771
4772 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4773
4774 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4775                                         const char *name,
4776                                         SMB_STRUCT_STAT *psbuf,
4777                                         struct security_descriptor **ppdesc)
4778 {
4779         struct dom_sid owner_sid, group_sid;
4780         size_t size = 0;
4781         struct security_ace aces[4];
4782         uint32_t access_mask = 0;
4783         mode_t mode = psbuf->st_ex_mode;
4784         struct security_acl *new_dacl = NULL;
4785         int idx = 0;
4786
4787         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4788                 name, (int)mode ));
4789
4790         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4791         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4792
4793         /*
4794          We provide up to 4 ACEs
4795                 - Owner
4796                 - Group
4797                 - Everyone
4798                 - NT System
4799         */
4800
4801         if (mode & S_IRUSR) {
4802                 if (mode & S_IWUSR) {
4803                         access_mask |= SEC_RIGHTS_FILE_ALL;
4804                 } else {
4805                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4806                 }
4807         }
4808         if (mode & S_IWUSR) {
4809                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4810         }
4811
4812         init_sec_ace(&aces[idx],
4813                         &owner_sid,
4814                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4815                         access_mask,
4816                         0);
4817         idx++;
4818
4819         access_mask = 0;
4820         if (mode & S_IRGRP) {
4821                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4822         }
4823         if (mode & S_IWGRP) {
4824                 /* note that delete is not granted - this matches posix behaviour */
4825                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4826         }
4827         if (access_mask) {
4828                 init_sec_ace(&aces[idx],
4829                         &group_sid,
4830                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4831                         access_mask,
4832                         0);
4833                 idx++;
4834         }
4835
4836         access_mask = 0;
4837         if (mode & S_IROTH) {
4838                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4839         }
4840         if (mode & S_IWOTH) {
4841                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4842         }
4843         if (access_mask) {
4844                 init_sec_ace(&aces[idx],
4845                         &global_sid_World,
4846                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4847                         access_mask,
4848                         0);
4849                 idx++;
4850         }
4851
4852         init_sec_ace(&aces[idx],
4853                         &global_sid_System,
4854                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4855                         SEC_RIGHTS_FILE_ALL,
4856                         0);
4857         idx++;
4858
4859         new_dacl = make_sec_acl(ctx,
4860                         NT4_ACL_REVISION,
4861                         idx,
4862                         aces);
4863
4864         if (!new_dacl) {
4865                 return NT_STATUS_NO_MEMORY;
4866         }
4867
4868         *ppdesc = make_sec_desc(ctx,
4869                         SECURITY_DESCRIPTOR_REVISION_1,
4870                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4871                         &owner_sid,
4872                         &group_sid,
4873                         NULL,
4874                         new_dacl,
4875                         &size);
4876         if (!*ppdesc) {
4877                 return NT_STATUS_NO_MEMORY;
4878         }
4879         return NT_STATUS_OK;
4880 }