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 #include "../librpc/gen_ndr/idmap.h"
  30
  31 extern const struct generic_mapping file_generic_mapping;
  32
  33 #undef  DBGC_CLASS
  34 #define DBGC_CLASS DBGC_ACLS
  35
  36 /****************************************************************************
  37  Data structures representing the internal ACE format.
  38 ****************************************************************************/
  39
  40 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  41 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  42
  43 typedef union posix_id {
  44                 uid_t uid;
  45                 gid_t gid;
  46                 int world;
  47 } posix_id;
  48
  49 typedef struct canon_ace {
  50         struct canon_ace *next, *prev;
  51         SMB_ACL_TAG_T type;
  52         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  53         struct dom_sid trustee;
  54         enum ace_owner owner_type;
  55         enum ace_attribute attr;
  56         posix_id unix_ug;
  57         uint8_t ace_flags; /* From windows ACE entry. */
  58 } canon_ace;
  59
  60 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  61
  62 /*
  63  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  64  * attribute on disk - version 1.
  65  * All values are little endian.
  66  *
  67  * |  1   |  1   |   2         |         2           |  ....
  68  * +------+------+-------------+---------------------+-------------+--------------------+
  69  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  70  * +------+------+-------------+---------------------+-------------+--------------------+
  71  *
  72  * Entry format is :
  73  *
  74  * |  1   |       4           |
  75  * +------+-------------------+
  76  * | value|  uid/gid or world |
  77  * | type |  value            |
  78  * +------+-------------------+
  79  *
  80  * Version 2 format. Stores extra Windows metadata about an ACL.
  81  *
  82  * |  1   |  2       |   2         |         2           |  ....
  83  * +------+----------+-------------+---------------------+-------------+--------------------+
  84  * | vers | ace      | num_entries | num_default_entries | ..entries.. | default_entries... |
  85  * |   2  |  type    |             |                     |             |                    |
  86  * +------+----------+-------------+---------------------+-------------+--------------------+
  87  *
  88  * Entry format is :
  89  *
  90  * |  1   |  1   |       4           |
  91  * +------+------+-------------------+
  92  * | ace  | value|  uid/gid or world |
  93  * | flag | type |  value            |
  94  * +------+-------------------+------+
  95  *
  96  */
  97
  98 #define PAI_VERSION_OFFSET                      0
  99
 100 #define PAI_V1_FLAG_OFFSET                      1
 101 #define PAI_V1_NUM_ENTRIES_OFFSET               2
 102 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET       4
 103 #define PAI_V1_ENTRIES_BASE                     6
 104 #define PAI_V1_ACL_FLAG_PROTECTED               0x1
 105 #define PAI_V1_ENTRY_LENGTH                     5
 106
 107 #define PAI_V1_VERSION                          1
 108
 109 #define PAI_V2_TYPE_OFFSET                      1
 110 #define PAI_V2_NUM_ENTRIES_OFFSET               3
 111 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET       5
 112 #define PAI_V2_ENTRIES_BASE                     7
 113 #define PAI_V2_ENTRY_LENGTH                     6
 114
 115 #define PAI_V2_VERSION                          2
 116
 117 /*
 118  * In memory format of user.SAMBA_PAI attribute.
 119  */
 120
 121 struct pai_entry {
 122         struct pai_entry *next, *prev;
 123         uint8_t ace_flags;
 124         enum ace_owner owner_type;
 125         posix_id unix_ug;
 126 };
 127
 128 struct pai_val {
 129         uint16_t sd_type;
 130         unsigned int num_entries;
 131         struct pai_entry *entry_list;
 132         unsigned int num_def_entries;
 133         struct pai_entry *def_entry_list;
 134 };
 135
 136 /************************************************************************
 137  Return a uint32 of the pai_entry principal.
 138 ************************************************************************/
 139
 140 static uint32_t get_pai_entry_val(struct pai_entry *paie)
 141 {
 142         switch (paie->owner_type) {
 143                 case UID_ACE:
 144                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 145                         return (uint32_t)paie->unix_ug.uid;
 146                 case GID_ACE:
 147                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 148                         return (uint32_t)paie->unix_ug.gid;
 149                 case WORLD_ACE:
 150                 default:
 151                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 152                         return (uint32_t)-1;
 153         }
 154 }
 155
 156 /************************************************************************
 157  Return a uint32 of the entry principal.
 158 ************************************************************************/
 159
 160 static uint32_t get_entry_val(canon_ace *ace_entry)
 161 {
 162         switch (ace_entry->owner_type) {
 163                 case UID_ACE:
 164                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
 165                         return (uint32_t)ace_entry->unix_ug.uid;
 166                 case GID_ACE:
 167                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
 168                         return (uint32_t)ace_entry->unix_ug.gid;
 169                 case WORLD_ACE:
 170                 default:
 171                         DEBUG(10,("get_entry_val: world ace\n"));
 172                         return (uint32_t)-1;
 173         }
 174 }
 175
 176 /************************************************************************
 177  Create the on-disk format (always v2 now). Caller must free.
 178 ************************************************************************/
 179
 180 static char *create_pai_buf_v2(canon_ace *file_ace_list,
 181                                 canon_ace *dir_ace_list,
 182                                 uint16_t sd_type,
 183                                 size_t *store_size)
 184 {
 185         char *pai_buf = NULL;
 186         canon_ace *ace_list = NULL;
 187         char *entry_offset = NULL;
 188         unsigned int num_entries = 0;
 189         unsigned int num_def_entries = 0;
 190         unsigned int i;
 191
 192         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 193                 num_entries++;
 194         }
 195
 196         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 197                 num_def_entries++;
 198         }
 199
 200         DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 201
 202         *store_size = PAI_V2_ENTRIES_BASE +
 203                 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
 204
 205         pai_buf = talloc_array(talloc_tos(), char, *store_size);
 206         if (!pai_buf) {
 207                 return NULL;
 208         }
 209
 210         /* Set up the header. */
 211         memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
 212         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
 213         SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
 214         SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
 215         SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 216
 217         DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
 218                         (unsigned int)sd_type ));
 219
 220         entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
 221
 222         i = 0;
 223         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 224                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 225                 uint32_t entry_val = get_entry_val(ace_list);
 226
 227                 SCVAL(entry_offset,0,ace_list->ace_flags);
 228                 SCVAL(entry_offset,1,type_val);
 229                 SIVAL(entry_offset,2,entry_val);
 230                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 231                         i,
 232                         (unsigned int)ace_list->ace_flags,
 233                         (unsigned int)type_val,
 234                         (unsigned int)entry_val ));
 235                 i++;
 236                 entry_offset += PAI_V2_ENTRY_LENGTH;
 237         }
 238
 239         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 240                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 241                 uint32_t entry_val = get_entry_val(ace_list);
 242
 243                 SCVAL(entry_offset,0,ace_list->ace_flags);
 244                 SCVAL(entry_offset,1,type_val);
 245                 SIVAL(entry_offset,2,entry_val);
 246                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 247                         i,
 248                         (unsigned int)ace_list->ace_flags,
 249                         (unsigned int)type_val,
 250                         (unsigned int)entry_val ));
 251                 i++;
 252                 entry_offset += PAI_V2_ENTRY_LENGTH;
 253         }
 254
 255         return pai_buf;
 256 }
 257
 258 /************************************************************************
 259  Store the user.SAMBA_PAI attribute on disk.
 260 ************************************************************************/
 261
 262 static void store_inheritance_attributes(files_struct *fsp,
 263                                         canon_ace *file_ace_list,
 264                                         canon_ace *dir_ace_list,
 265                                         uint16_t sd_type)
 266 {
 267         int ret;
 268         size_t store_size;
 269         char *pai_buf;
 270
 271         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 272                 return;
 273         }
 274
 275         pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
 276                                 sd_type, &store_size);
 277
 278         if (fsp->fh->fd != -1) {
 279                 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 280                                 pai_buf, store_size, 0);
 281         } else {
 282                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
 283                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 284                                        pai_buf, store_size, 0);
 285         }
 286
 287         TALLOC_FREE(pai_buf);
 288
 289         DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
 290                 (unsigned int)sd_type,
 291                 fsp_str_dbg(fsp)));
 292
 293         if (ret == -1 && !no_acl_syscall_error(errno)) {
 294                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 295         }
 296 }
 297
 298 /************************************************************************
 299  Delete the in memory inheritance info.
 300 ************************************************************************/
 301
 302 static void free_inherited_info(struct pai_val *pal)
 303 {
 304         if (pal) {
 305                 struct pai_entry *paie, *paie_next;
 306                 for (paie = pal->entry_list; paie; paie = paie_next) {
 307                         paie_next = paie->next;
 308                         TALLOC_FREE(paie);
 309                 }
 310                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 311                         paie_next = paie->next;
 312                         TALLOC_FREE(paie);
 313                 }
 314                 TALLOC_FREE(pal);
 315         }
 316 }
 317
 318 /************************************************************************
 319  Get any stored ACE flags.
 320 ************************************************************************/
 321
 322 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
 323 {
 324         struct pai_entry *paie;
 325
 326         if (!pal) {
 327                 return 0;
 328         }
 329
 330         /* If the entry exists it is inherited. */
 331         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 332                 if (ace_entry->owner_type == paie->owner_type &&
 333                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 334                         return paie->ace_flags;
 335         }
 336         return 0;
 337 }
 338
 339 /************************************************************************
 340  Ensure an attribute just read is valid - v1.
 341 ************************************************************************/
 342
 343 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
 344 {
 345         uint16 num_entries;
 346         uint16 num_def_entries;
 347
 348         if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
 349                 /* Corrupted - too small. */
 350                 return false;
 351         }
 352
 353         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
 354                 return false;
 355         }
 356
 357         num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
 358         num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 359
 360         /* Check the entry lists match. */
 361         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 362
 363         if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
 364                         PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
 365                 return false;
 366         }
 367
 368         return true;
 369 }
 370
 371 /************************************************************************
 372  Ensure an attribute just read is valid - v2.
 373 ************************************************************************/
 374
 375 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
 376 {
 377         uint16 num_entries;
 378         uint16 num_def_entries;
 379
 380         if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
 381                 /* Corrupted - too small. */
 382                 return false;
 383         }
 384
 385         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
 386                 return false;
 387         }
 388
 389         num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
 390         num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 391
 392         /* Check the entry lists match. */
 393         /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
 394
 395         if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
 396                         PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
 397                 return false;
 398         }
 399
 400         return true;
 401 }
 402
 403 /************************************************************************
 404  Decode the owner.
 405 ************************************************************************/
 406
 407 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
 408 {
 409         paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 410         switch( paie->owner_type) {
 411                 case UID_ACE:
 412                         paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 413                         DEBUG(10,("get_pai_owner_type: uid = %u\n",
 414                                 (unsigned int)paie->unix_ug.uid ));
 415                         break;
 416                 case GID_ACE:
 417                         paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 418                         DEBUG(10,("get_pai_owner_type: gid = %u\n",
 419                                 (unsigned int)paie->unix_ug.gid ));
 420                         break;
 421                 case WORLD_ACE:
 422                         paie->unix_ug.world = -1;
 423                         DEBUG(10,("get_pai_owner_type: world ace\n"));
 424                         break;
 425                 default:
 426                         DEBUG(10,("get_pai_owner_type: unknown type %u\n",
 427                                 (unsigned int)paie->owner_type ));
 428                         return false;
 429         }
 430         return true;
 431 }
 432
 433 /************************************************************************
 434  Process v2 entries.
 435 ************************************************************************/
 436
 437 static const char *create_pai_v1_entries(struct pai_val *paiv,
 438                                 const char *entry_offset,
 439                                 bool def_entry)
 440 {
 441         int i;
 442
 443         for (i = 0; i < paiv->num_entries; i++) {
 444                 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
 445                 if (!paie) {
 446                         return NULL;
 447                 }
 448
 449                 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
 450                 if (!get_pai_owner_type(paie, entry_offset)) {
 451                         TALLOC_FREE(paie);
 452                         return NULL;
 453                 }
 454
 455                 if (!def_entry) {
 456                         DLIST_ADD(paiv->entry_list, paie);
 457                 } else {
 458                         DLIST_ADD(paiv->def_entry_list, paie);
 459                 }
 460                 entry_offset += PAI_V1_ENTRY_LENGTH;
 461         }
 462         return entry_offset;
 463 }
 464
 465 /************************************************************************
 466  Convert to in-memory format from version 1.
 467 ************************************************************************/
 468
 469 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
 470 {
 471         const char *entry_offset;
 472         struct pai_val *paiv = NULL;
 473
 474         if (!check_pai_ok_v1(buf, size)) {
 475                 return NULL;
 476         }
 477
 478         paiv = talloc(talloc_tos(), struct pai_val);
 479         if (!paiv) {
 480                 return NULL;
 481         }
 482
 483         memset(paiv, '\0', sizeof(struct pai_val));
 484
 485         paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
 486                         SEC_DESC_DACL_PROTECTED : 0;
 487
 488         paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
 489         paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 490
 491         entry_offset = buf + PAI_V1_ENTRIES_BASE;
 492
 493         DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
 494                         paiv->num_entries, paiv->num_def_entries ));
 495
 496         entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
 497         if (entry_offset == NULL) {
 498                 free_inherited_info(paiv);
 499                 return NULL;
 500         }
 501         entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
 502         if (entry_offset == NULL) {
 503                 free_inherited_info(paiv);
 504                 return NULL;
 505         }
 506
 507         return paiv;
 508 }
 509
 510 /************************************************************************
 511  Process v2 entries.
 512 ************************************************************************/
 513
 514 static const char *create_pai_v2_entries(struct pai_val *paiv,
 515                                 unsigned int num_entries,
 516                                 const char *entry_offset,
 517                                 bool def_entry)
 518 {
 519         unsigned int i;
 520
 521         for (i = 0; i < num_entries; i++) {
 522                 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
 523                 if (!paie) {
 524                         return NULL;
 525                 }
 526
 527                 paie->ace_flags = CVAL(entry_offset,0);
 528
 529                 if (!get_pai_owner_type(paie, entry_offset+1)) {
 530                         TALLOC_FREE(paie);
 531                         return NULL;
 532                 }
 533                 if (!def_entry) {
 534                         DLIST_ADD(paiv->entry_list, paie);
 535                 } else {
 536                         DLIST_ADD(paiv->def_entry_list, paie);
 537                 }
 538                 entry_offset += PAI_V2_ENTRY_LENGTH;
 539         }
 540         return entry_offset;
 541 }
 542
 543 /************************************************************************
 544  Convert to in-memory format from version 2.
 545 ************************************************************************/
 546
 547 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
 548 {
 549         const char *entry_offset;
 550         struct pai_val *paiv = NULL;
 551
 552         if (!check_pai_ok_v2(buf, size)) {
 553                 return NULL;
 554         }
 555
 556         paiv = talloc(talloc_tos(), struct pai_val);
 557         if (!paiv) {
 558                 return NULL;
 559         }
 560
 561         memset(paiv, '\0', sizeof(struct pai_val));
 562
 563         paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
 564
 565         paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
 566         paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 567
 568         entry_offset = buf + PAI_V2_ENTRIES_BASE;
 569
 570         DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
 571                         (unsigned int)paiv->sd_type,
 572                         paiv->num_entries, paiv->num_def_entries ));
 573
 574         entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
 575                                 entry_offset, false);
 576         if (entry_offset == NULL) {
 577                 free_inherited_info(paiv);
 578                 return NULL;
 579         }
 580         entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
 581                                 entry_offset, true);
 582         if (entry_offset == NULL) {
 583                 free_inherited_info(paiv);
 584                 return NULL;
 585         }
 586
 587         return paiv;
 588 }
 589
 590 /************************************************************************
 591  Convert to in-memory format - from either version 1 or 2.
 592 ************************************************************************/
 593
 594 static struct pai_val *create_pai_val(const char *buf, size_t size)
 595 {
 596         if (size < 1) {
 597                 return NULL;
 598         }
 599         if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
 600                 return create_pai_val_v1(buf, size);
 601         } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
 602                 return create_pai_val_v2(buf, size);
 603         } else {
 604                 return NULL;
 605         }
 606 }
 607
 608 /************************************************************************
 609  Load the user.SAMBA_PAI attribute.
 610 ************************************************************************/
 611
 612 static struct pai_val *fload_inherited_info(files_struct *fsp)
 613 {
 614         char *pai_buf;
 615         size_t pai_buf_size = 1024;
 616         struct pai_val *paiv = NULL;
 617         ssize_t ret;
 618
 619         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 620                 return NULL;
 621         }
 622
 623         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
 624                 return NULL;
 625         }
 626
 627         do {
 628                 if (fsp->fh->fd != -1) {
 629                         ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 630                                         pai_buf, pai_buf_size);
 631                 } else {
 632                         ret = SMB_VFS_GETXATTR(fsp->conn,
 633                                                fsp->fsp_name->base_name,
 634                                                SAMBA_POSIX_INHERITANCE_EA_NAME,
 635                                                pai_buf, pai_buf_size);
 636                 }
 637
 638                 if (ret == -1) {
 639                         if (errno != ERANGE) {
 640                                 break;
 641                         }
 642                         /* Buffer too small - enlarge it. */
 643                         pai_buf_size *= 2;
 644                         TALLOC_FREE(pai_buf);
 645                         if (pai_buf_size > 1024*1024) {
 646                                 return NULL; /* Limit malloc to 1mb. */
 647                         }
 648                         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
 649                                 return NULL;
 650                 }
 651         } while (ret == -1);
 652
 653         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
 654                   (unsigned long)ret, fsp_str_dbg(fsp)));
 655
 656         if (ret == -1) {
 657                 /* No attribute or not supported. */
 658 #if defined(ENOATTR)
 659                 if (errno != ENOATTR)
 660                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 661 #else
 662                 if (errno != ENOSYS)
 663                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 664 #endif
 665                 TALLOC_FREE(pai_buf);
 666                 return NULL;
 667         }
 668
 669         paiv = create_pai_val(pai_buf, ret);
 670
 671         if (paiv) {
 672                 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
 673                           (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
 674         }
 675
 676         TALLOC_FREE(pai_buf);
 677         return paiv;
 678 }
 679
 680 /************************************************************************
 681  Load the user.SAMBA_PAI attribute.
 682 ************************************************************************/
 683
 684 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
 685                                            const char *fname)
 686 {
 687         char *pai_buf;
 688         size_t pai_buf_size = 1024;
 689         struct pai_val *paiv = NULL;
 690         ssize_t ret;
 691
 692         if (!lp_map_acl_inherit(SNUM(conn))) {
 693                 return NULL;
 694         }
 695
 696         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
 697                 return NULL;
 698         }
 699
 700         do {
 701                 ret = SMB_VFS_GETXATTR(conn, fname,
 702                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 703                                        pai_buf, pai_buf_size);
 704
 705                 if (ret == -1) {
 706                         if (errno != ERANGE) {
 707                                 break;
 708                         }
 709                         /* Buffer too small - enlarge it. */
 710                         pai_buf_size *= 2;
 711                         TALLOC_FREE(pai_buf);
 712                         if (pai_buf_size > 1024*1024) {
 713                                 return NULL; /* Limit malloc to 1mb. */
 714                         }
 715                         if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
 716                                 return NULL;
 717                 }
 718         } while (ret == -1);
 719
 720         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
 721
 722         if (ret == -1) {
 723                 /* No attribute or not supported. */
 724 #if defined(ENOATTR)
 725                 if (errno != ENOATTR)
 726                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 727 #else
 728                 if (errno != ENOSYS)
 729                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 730 #endif
 731                 TALLOC_FREE(pai_buf);
 732                 return NULL;
 733         }
 734
 735         paiv = create_pai_val(pai_buf, ret);
 736
 737         if (paiv) {
 738                 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
 739                         (unsigned int)paiv->sd_type,
 740                         fname));
 741         }
 742
 743         TALLOC_FREE(pai_buf);
 744         return paiv;
 745 }
 746
 747 /****************************************************************************
 748  Functions to manipulate the internal ACE format.
 749 ****************************************************************************/
 750
 751 /****************************************************************************
 752  Count a linked list of canonical ACE entries.
 753 ****************************************************************************/
 754
 755 static size_t count_canon_ace_list( canon_ace *l_head )
 756 {
 757         size_t count = 0;
 758         canon_ace *ace;
 759
 760         for (ace = l_head; ace; ace = ace->next)
 761                 count++;
 762
 763         return count;
 764 }
 765
 766 /****************************************************************************
 767  Free a linked list of canonical ACE entries.
 768 ****************************************************************************/
 769
 770 static void free_canon_ace_list( canon_ace *l_head )
 771 {
 772         canon_ace *list, *next;
 773
 774         for (list = l_head; list; list = next) {
 775                 next = list->next;
 776                 DLIST_REMOVE(l_head, list);
 777                 TALLOC_FREE(list);
 778         }
 779 }
 780
 781 /****************************************************************************
 782  Function to duplicate a canon_ace entry.
 783 ****************************************************************************/
 784
 785 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 786 {
 787         canon_ace *dst_ace = talloc(talloc_tos(), canon_ace);
 788
 789         if (dst_ace == NULL)
 790                 return NULL;
 791
 792         *dst_ace = *src_ace;
 793         dst_ace->prev = dst_ace->next = NULL;
 794         return dst_ace;
 795 }
 796
 797 /****************************************************************************
 798  Print out a canon ace.
 799 ****************************************************************************/
 800
 801 static void print_canon_ace(canon_ace *pace, int num)
 802 {
 803         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 804         dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
 805         if (pace->owner_type == UID_ACE) {
 806                 const char *u_name = uidtoname(pace->unix_ug.uid);
 807                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
 808         } else if (pace->owner_type == GID_ACE) {
 809                 char *g_name = gidtoname(pace->unix_ug.gid);
 810                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
 811         } else
 812                 dbgtext( "other ");
 813         switch (pace->type) {
 814                 case SMB_ACL_USER:
 815                         dbgtext( "SMB_ACL_USER ");
 816                         break;
 817                 case SMB_ACL_USER_OBJ:
 818                         dbgtext( "SMB_ACL_USER_OBJ ");
 819                         break;
 820                 case SMB_ACL_GROUP:
 821                         dbgtext( "SMB_ACL_GROUP ");
 822                         break;
 823                 case SMB_ACL_GROUP_OBJ:
 824                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 825                         break;
 826                 case SMB_ACL_OTHER:
 827                         dbgtext( "SMB_ACL_OTHER ");
 828                         break;
 829                 default:
 830                         dbgtext( "MASK " );
 831                         break;
 832         }
 833
 834         dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
 835         dbgtext( "perms ");
 836         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 837         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 838         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 839 }
 840
 841 /****************************************************************************
 842  Print out a canon ace list.
 843 ****************************************************************************/
 844
 845 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 846 {
 847         int count = 0;
 848
 849         if( DEBUGLVL( 10 )) {
 850                 dbgtext( "print_canon_ace_list: %s\n", name );
 851                 for (;ace_list; ace_list = ace_list->next, count++)
 852                         print_canon_ace(ace_list, count );
 853         }
 854 }
 855
 856 /****************************************************************************
 857  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 858 ****************************************************************************/
 859
 860 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
 861 {
 862         mode_t ret = 0;
 863
 864         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
 865         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 866         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 867
 868         return ret;
 869 }
 870
 871 /****************************************************************************
 872  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 873 ****************************************************************************/
 874
 875 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 876 {
 877         mode_t ret = 0;
 878
 879         if (mode & r_mask)
 880                 ret |= S_IRUSR;
 881         if (mode & w_mask)
 882                 ret |= S_IWUSR;
 883         if (mode & x_mask)
 884                 ret |= S_IXUSR;
 885
 886         return ret;
 887 }
 888
 889 /****************************************************************************
 890  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 891  an SMB_ACL_PERMSET_T.
 892 ****************************************************************************/
 893
 894 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 895 {
 896         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1)
 897                 return -1;
 898         if (mode & S_IRUSR) {
 899                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
 900                         return -1;
 901         }
 902         if (mode & S_IWUSR) {
 903                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
 904                         return -1;
 905         }
 906         if (mode & S_IXUSR) {
 907                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
 908                         return -1;
 909         }
 910         return 0;
 911 }
 912
 913 /****************************************************************************
 914  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 915 ****************************************************************************/
 916
 917 void create_file_sids(const SMB_STRUCT_STAT *psbuf, struct dom_sid *powner_sid, struct dom_sid *pgroup_sid)
 918 {
 919         uid_to_sid( powner_sid, psbuf->st_ex_uid );
 920         gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
 921 }
 922
 923 /****************************************************************************
 924  Merge aces with a common sid - if both are allow or deny, OR the permissions together and
 925  delete the second one. If the first is deny, mask the permissions off and delete the allow
 926  if the permissions become zero, delete the deny if the permissions are non zero.
 927 ****************************************************************************/
 928
 929 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
 930 {
 931         canon_ace *l_head = *pp_list_head;
 932         canon_ace *curr_ace_outer;
 933         canon_ace *curr_ace_outer_next;
 934
 935         /*
 936          * First, merge allow entries with identical SIDs, and deny entries
 937          * with identical SIDs.
 938          */
 939
 940         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 941                 canon_ace *curr_ace;
 942                 canon_ace *curr_ace_next;
 943
 944                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 945
 946                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 947                         bool can_merge = false;
 948
 949                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 950
 951                         /* For file ACLs we can merge if the SIDs and ALLOW/DENY
 952                          * types are the same. For directory acls we must also
 953                          * ensure the POSIX ACL types are the same.
 954                          *
 955                          * For the IDMAP_BOTH case, we must not merge
 956                          * the UID and GID ACE values for same SID
 957                          */
 958
 959                         if (!dir_acl) {
 960                                 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 961                                              curr_ace->owner_type == curr_ace_outer->owner_type &&
 962                                              (curr_ace->attr == curr_ace_outer->attr));
 963                         } else {
 964                                 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 965                                              curr_ace->owner_type == curr_ace_outer->owner_type &&
 966                                              (curr_ace->type == curr_ace_outer->type) &&
 967                                              (curr_ace->attr == curr_ace_outer->attr));
 968                         }
 969
 970                         if (can_merge) {
 971                                 if( DEBUGLVL( 10 )) {
 972                                         dbgtext("merge_aces: Merging ACE's\n");
 973                                         print_canon_ace( curr_ace_outer, 0);
 974                                         print_canon_ace( curr_ace, 0);
 975                                 }
 976
 977                                 /* Merge two allow or two deny ACE's. */
 978
 979                                 /* Theoretically we shouldn't merge a dir ACE if
 980                                  * one ACE has the CI flag set, and the other
 981                                  * ACE has the OI flag set, but this is rare
 982                                  * enough we can ignore it. */
 983
 984                                 curr_ace_outer->perms |= curr_ace->perms;
 985                                 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
 986                                 DLIST_REMOVE(l_head, curr_ace);
 987                                 TALLOC_FREE(curr_ace);
 988                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 989                         }
 990                 }
 991         }
 992
 993         /*
 994          * Now go through and mask off allow permissions with deny permissions.
 995          * We can delete either the allow or deny here as we know that each SID
 996          * appears only once in the list.
 997          */
 998
 999         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
1000                 canon_ace *curr_ace;
1001                 canon_ace *curr_ace_next;
1002
1003                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
1004
1005                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
1006
1007                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1008
1009                         /*
1010                          * Subtract ACE's with different entries. Due to the ordering constraints
1011                          * we've put on the ACL, we know the deny must be the first one.
1012                          */
1013
1014                         if (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1015                             (curr_ace->owner_type == curr_ace_outer->owner_type) &&
1016                             (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1017
1018                                 if( DEBUGLVL( 10 )) {
1019                                         dbgtext("merge_aces: Masking ACE's\n");
1020                                         print_canon_ace( curr_ace_outer, 0);
1021                                         print_canon_ace( curr_ace, 0);
1022                                 }
1023
1024                                 curr_ace->perms &= ~curr_ace_outer->perms;
1025
1026                                 if (curr_ace->perms == 0) {
1027
1028                                         /*
1029                                          * The deny overrides the allow. Remove the allow.
1030                                          */
1031
1032                                         DLIST_REMOVE(l_head, curr_ace);
1033                                         TALLOC_FREE(curr_ace);
1034                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1035
1036                                 } else {
1037
1038                                         /*
1039                                          * Even after removing permissions, there
1040                                          * are still allow permissions - delete the deny.
1041                                          * It is safe to delete the deny here,
1042                                          * as we are guarenteed by the deny first
1043                                          * ordering that all the deny entries for
1044                                          * this SID have already been merged into one
1045                                          * before we can get to an allow ace.
1046                                          */
1047
1048                                         DLIST_REMOVE(l_head, curr_ace_outer);
1049                                         TALLOC_FREE(curr_ace_outer);
1050                                         break;
1051                                 }
1052                         }
1053
1054                 } /* end for curr_ace */
1055         } /* end for curr_ace_outer */
1056
1057         /* We may have modified the list. */
1058
1059         *pp_list_head = l_head;
1060 }
1061
1062 /****************************************************************************
1063  Check if we need to return NT4.x compatible ACL entries.
1064 ****************************************************************************/
1065
1066 bool nt4_compatible_acls(void)
1067 {
1068         int compat = lp_acl_compatibility();
1069
1070         if (compat == ACL_COMPAT_AUTO) {
1071                 enum remote_arch_types ra_type = get_remote_arch();
1072
1073                 /* Automatically adapt to client */
1074                 return (ra_type <= RA_WINNT);
1075         } else
1076                 return (compat == ACL_COMPAT_WINNT);
1077 }
1078
1079
1080 /****************************************************************************
1081  Map canon_ace perms to permission bits NT.
1082  The attr element is not used here - we only process deny entries on set,
1083  not get. Deny entries are implicit on get with ace->perms = 0.
1084 ****************************************************************************/
1085
1086 uint32_t map_canon_ace_perms(int snum,
1087                                 enum security_ace_type *pacl_type,
1088                                 mode_t perms,
1089                                 bool directory_ace)
1090 {
1091         uint32_t nt_mask = 0;
1092
1093         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1094
1095         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1096                 if (directory_ace) {
1097                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1098                 } else {
1099                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1100                 }
1101         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1102                 /*
1103                  * Windows NT refuses to display ACEs with no permissions in them (but
1104                  * they are perfectly legal with Windows 2000). If the ACE has empty
1105                  * permissions we cannot use 0, so we use the otherwise unused
1106                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1107                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1108                  * to be changed in the future.
1109                  */
1110
1111                 if (nt4_compatible_acls())
1112                         nt_mask = UNIX_ACCESS_NONE;
1113                 else
1114                         nt_mask = 0;
1115         } else {
1116                 if (directory_ace) {
1117                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1118                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1119                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1120                 } else {
1121                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1122                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1123                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1124                 }
1125         }
1126
1127         if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1128                 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1129         }
1130
1131         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1132                         (unsigned int)perms, (unsigned int)nt_mask ));
1133
1134         return nt_mask;
1135 }
1136
1137 /****************************************************************************
1138  Map NT perms to a UNIX mode_t.
1139 ****************************************************************************/
1140
1141 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1142 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1143 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1144
1145 static mode_t map_nt_perms( uint32 *mask, int type)
1146 {
1147         mode_t mode = 0;
1148
1149         switch(type) {
1150         case S_IRUSR:
1151                 if((*mask) & GENERIC_ALL_ACCESS)
1152                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1153                 else {
1154                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1155                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1156                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1157                 }
1158                 break;
1159         case S_IRGRP:
1160                 if((*mask) & GENERIC_ALL_ACCESS)
1161                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1162                 else {
1163                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1164                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1165                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1166                 }
1167                 break;
1168         case S_IROTH:
1169                 if((*mask) & GENERIC_ALL_ACCESS)
1170                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1171                 else {
1172                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1173                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1174                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1175                 }
1176                 break;
1177         }
1178
1179         return mode;
1180 }
1181
1182 /****************************************************************************
1183  Unpack a struct security_descriptor into a UNIX owner and group.
1184 ****************************************************************************/
1185
1186 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1187                         uid_t *puser, gid_t *pgrp,
1188                         uint32 security_info_sent, const struct
1189                         security_descriptor *psd)
1190 {
1191         struct dom_sid owner_sid;
1192         struct dom_sid grp_sid;
1193
1194         *puser = (uid_t)-1;
1195         *pgrp = (gid_t)-1;
1196
1197         if(security_info_sent == 0) {
1198                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1199                 return NT_STATUS_OK;
1200         }
1201
1202         /*
1203          * Validate the owner and group SID's.
1204          */
1205
1206         memset(&owner_sid, '\0', sizeof(owner_sid));
1207         memset(&grp_sid, '\0', sizeof(grp_sid));
1208
1209         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1210
1211         /*
1212          * Don't immediately fail if the owner sid cannot be validated.
1213          * This may be a group chown only set.
1214          */
1215
1216         if (security_info_sent & SECINFO_OWNER) {
1217                 sid_copy(&owner_sid, psd->owner_sid);
1218                 if (!sid_to_uid(&owner_sid, puser)) {
1219                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1220                                 /* this allows take ownership to work
1221                                  * reasonably */
1222                                 *puser = get_current_uid(conn);
1223                         } else {
1224                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1225                                          " owner sid for %s\n",
1226                                          sid_string_dbg(&owner_sid)));
1227                                 return NT_STATUS_INVALID_OWNER;
1228                         }
1229                 }
1230                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1231                          (unsigned int)*puser ));
1232         }
1233
1234         /*
1235          * Don't immediately fail if the group sid cannot be validated.
1236          * This may be an owner chown only set.
1237          */
1238
1239         if (security_info_sent & SECINFO_GROUP) {
1240                 sid_copy(&grp_sid, psd->group_sid);
1241                 if (!sid_to_gid( &grp_sid, pgrp)) {
1242                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1243                                 /* this allows take group ownership to work
1244                                  * reasonably */
1245                                 *pgrp = get_current_gid(conn);
1246                         } else {
1247                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1248                                          " group sid.\n"));
1249                                 return NT_STATUS_INVALID_OWNER;
1250                         }
1251                 }
1252                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1253                          (unsigned int)*pgrp));
1254         }
1255
1256         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1257
1258         return NT_STATUS_OK;
1259 }
1260
1261 /****************************************************************************
1262  Ensure the enforced permissions for this share apply.
1263 ****************************************************************************/
1264
1265 static void apply_default_perms(const struct share_params *params,
1266                                 const bool is_directory, canon_ace *pace,
1267                                 mode_t type)
1268 {
1269         mode_t and_bits = (mode_t)0;
1270         mode_t or_bits = (mode_t)0;
1271
1272         /* Get the initial bits to apply. */
1273
1274         if (is_directory) {
1275                 and_bits = lp_dir_security_mask(params->service);
1276                 or_bits = lp_force_dir_security_mode(params->service);
1277         } else {
1278                 and_bits = lp_security_mask(params->service);
1279                 or_bits = lp_force_security_mode(params->service);
1280         }
1281
1282         /* Now bounce them into the S_USR space. */
1283         switch(type) {
1284         case S_IRUSR:
1285                 /* Ensure owner has read access. */
1286                 pace->perms |= S_IRUSR;
1287                 if (is_directory)
1288                         pace->perms |= (S_IWUSR|S_IXUSR);
1289                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1290                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1291                 break;
1292         case S_IRGRP:
1293                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1294                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1295                 break;
1296         case S_IROTH:
1297                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1298                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1299                 break;
1300         }
1301
1302         pace->perms = ((pace->perms & and_bits)|or_bits);
1303 }
1304
1305 /****************************************************************************
1306  Check if a given uid/SID is in a group gid/SID. This is probably very
1307  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1308 ****************************************************************************/
1309
1310 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1311 {
1312         const char *u_name = NULL;
1313
1314         /* "Everyone" always matches every uid. */
1315
1316         if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1317                 return True;
1318
1319         /*
1320          * if it's the current user, we already have the unix token
1321          * and don't need to do the complex user_in_group_sid() call
1322          */
1323         if (uid_ace->unix_ug.uid == get_current_uid(conn)) {
1324                 const struct security_unix_token *curr_utok = NULL;
1325                 size_t i;
1326
1327                 if (group_ace->unix_ug.gid == get_current_gid(conn)) {
1328                         return True;
1329                 }
1330
1331                 curr_utok = get_current_utok(conn);
1332                 for (i=0; i < curr_utok->ngroups; i++) {
1333                         if (group_ace->unix_ug.gid == curr_utok->groups[i]) {
1334                                 return True;
1335                         }
1336                 }
1337         }
1338
1339         /* u_name talloc'ed off tos. */
1340         u_name = uidtoname(uid_ace->unix_ug.uid);
1341         if (!u_name) {
1342                 return False;
1343         }
1344
1345         /*
1346          * user_in_group_sid() uses create_token_from_username()
1347          * which creates an artificial NT token given just a username,
1348          * so this is not reliable for users from foreign domains
1349          * exported by winbindd!
1350          */
1351         return user_in_group_sid(u_name, &group_ace->trustee);
1352 }
1353
1354 /****************************************************************************
1355  A well formed POSIX file or default ACL has at least 3 entries, a
1356  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1357  In addition, the owner must always have at least read access.
1358  When using this call on get_acl, the pst struct is valid and contains
1359  the mode of the file. When using this call on set_acl, the pst struct has
1360  been modified to have a mode containing the default for this file or directory
1361  type.
1362 ****************************************************************************/
1363
1364 static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
1365                                      const struct share_params *params,
1366                                      const bool is_directory,
1367                                                         const struct dom_sid *pfile_owner_sid,
1368                                                         const struct dom_sid *pfile_grp_sid,
1369                                                         const SMB_STRUCT_STAT *pst,
1370                                                         bool setting_acl)
1371 {
1372         canon_ace *pace;
1373         canon_ace *pace_user = NULL;
1374         canon_ace *pace_group = NULL;
1375         canon_ace *pace_other = NULL;
1376
1377         for (pace = *pp_ace; pace; pace = pace->next) {
1378                 if (pace->type == SMB_ACL_USER_OBJ) {
1379
1380                         if (setting_acl)
1381                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1382                         pace_user = pace;
1383
1384                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1385
1386                         /*
1387                          * Ensure create mask/force create mode is respected on set.
1388                          */
1389
1390                         if (setting_acl)
1391                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1392                         pace_group = pace;
1393
1394                 } else if (pace->type == SMB_ACL_OTHER) {
1395
1396                         /*
1397                          * Ensure create mask/force create mode is respected on set.
1398                          */
1399
1400                         if (setting_acl)
1401                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1402                         pace_other = pace;
1403                 }
1404         }
1405
1406         if (!pace_user) {
1407                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1408                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1409                         return False;
1410                 }
1411
1412                 ZERO_STRUCTP(pace);
1413                 pace->type = SMB_ACL_USER_OBJ;
1414                 pace->owner_type = UID_ACE;
1415                 pace->unix_ug.uid = pst->st_ex_uid;
1416                 pace->trustee = *pfile_owner_sid;
1417                 pace->attr = ALLOW_ACE;
1418                 /* Start with existing permissions, principle of least
1419                    surprises for the user. */
1420                 pace->perms = pst->st_ex_mode;
1421
1422                 if (setting_acl) {
1423                         /* See if the owning user is in any of the other groups in
1424                            the ACE, or if there's a matching user entry (by uid
1425                            or in the case of ID_TYPE_BOTH by SID).
1426                            If so, OR in the permissions from that entry. */
1427
1428                         canon_ace *pace_iter;
1429
1430                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1431                                 if (pace_iter->type == SMB_ACL_USER &&
1432                                                 pace_iter->unix_ug.uid == pace->unix_ug.uid) {
1433                                         pace->perms |= pace_iter->perms;
1434                                 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1435                                         if (dom_sid_equal(&pace->trustee, &pace_iter->trustee)) {
1436                                                 pace->perms |= pace_iter->perms;
1437                                         } else if (uid_entry_in_group(conn, pace, pace_iter)) {
1438                                                 pace->perms |= pace_iter->perms;
1439                                         }
1440                                 }
1441                         }
1442
1443                         if (pace->perms == 0) {
1444                                 /* If we only got an "everyone" perm, just use that. */
1445                                 if (pace_other)
1446                                         pace->perms = pace_other->perms;
1447                         }
1448
1449                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1450                 } else {
1451                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1452                 }
1453
1454                 DLIST_ADD(*pp_ace, pace);
1455                 pace_user = pace;
1456         }
1457
1458         if (!pace_group) {
1459                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1460                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1461                         return False;
1462                 }
1463
1464                 ZERO_STRUCTP(pace);
1465                 pace->type = SMB_ACL_GROUP_OBJ;
1466                 pace->owner_type = GID_ACE;
1467                 pace->unix_ug.gid = pst->st_ex_gid;
1468                 pace->trustee = *pfile_grp_sid;
1469                 pace->attr = ALLOW_ACE;
1470                 if (setting_acl) {
1471                         /* If we only got an "everyone" perm, just use that. */
1472                         if (pace_other)
1473                                 pace->perms = pace_other->perms;
1474                         else
1475                                 pace->perms = 0;
1476                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1477                 } else {
1478                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1479                 }
1480
1481                 DLIST_ADD(*pp_ace, pace);
1482                 pace_group = pace;
1483         }
1484
1485         if (!pace_other) {
1486                 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1487                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1488                         return False;
1489                 }
1490
1491                 ZERO_STRUCTP(pace);
1492                 pace->type = SMB_ACL_OTHER;
1493                 pace->owner_type = WORLD_ACE;
1494                 pace->unix_ug.world = -1;
1495                 pace->trustee = global_sid_World;
1496                 pace->attr = ALLOW_ACE;
1497                 if (setting_acl) {
1498                         pace->perms = 0;
1499                         apply_default_perms(params, is_directory, pace, S_IROTH);
1500                 } else
1501                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1502
1503                 DLIST_ADD(*pp_ace, pace);
1504                 pace_other = pace;
1505         }
1506
1507         if (setting_acl) {
1508                 /* Ensure when setting a POSIX ACL, that the uid for a
1509                    SMB_ACL_USER_OBJ ACE (the owner ACE entry) has a duplicate
1510                    permission entry as an SMB_ACL_USER, and a gid for a
1511                    SMB_ACL_GROUP_OBJ ACE (the primary group ACE entry) also has
1512                    a duplicate permission entry as an SMB_ACL_GROUP. If not,
1513                    then if the ownership or group ownership of this file or
1514                    directory gets changed, the user or group can lose their
1515                    access. */
1516                 bool got_duplicate_user = false;
1517                 bool got_duplicate_group = false;
1518
1519                 for (pace = *pp_ace; pace; pace = pace->next) {
1520                         if (pace->type == SMB_ACL_USER &&
1521                                         pace->unix_ug.uid == pace_user->unix_ug.uid) {
1522                                 /* Already got one. */
1523                                 got_duplicate_user = true;
1524                         } else if (pace->type == SMB_ACL_GROUP &&
1525                                         pace->unix_ug.gid == pace_user->unix_ug.gid) {
1526                                 /* Already got one. */
1527                                 got_duplicate_group = true;
1528                         }
1529                 }
1530
1531                 if (!got_duplicate_user) {
1532                         /* Add a duplicate SMB_ACL_USER entry. */
1533                         if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1534                                 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1535                                 return false;
1536                         }
1537
1538                         ZERO_STRUCTP(pace);
1539                         pace->type = SMB_ACL_USER;;
1540                         pace->owner_type = UID_ACE;
1541                         pace->unix_ug.uid = pace_user->unix_ug.uid;
1542                         pace->trustee = pace_user->trustee;
1543                         pace->attr = pace_user->attr;
1544                         pace->perms = pace_user->perms;
1545
1546                         DLIST_ADD(*pp_ace, pace);
1547                 }
1548
1549                 if (!got_duplicate_group) {
1550                         /* Add a duplicate SMB_ACL_GROUP entry. */
1551                         if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1552                                 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1553                                 return false;
1554                         }
1555
1556                         ZERO_STRUCTP(pace);
1557                         pace->type = SMB_ACL_GROUP;;
1558                         pace->owner_type = GID_ACE;
1559                         pace->unix_ug.gid = pace_group->unix_ug.gid;
1560                         pace->trustee = pace_group->trustee;
1561                         pace->attr = pace_group->attr;
1562                         pace->perms = pace_group->perms;
1563
1564                         DLIST_ADD(*pp_ace, pace);
1565                 }
1566
1567         }
1568
1569         return True;
1570 }
1571
1572 /****************************************************************************
1573  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1574  If it does not have them, check if there are any entries where the trustee is the
1575  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1576  Note we must not do this to default directory ACLs.
1577 ****************************************************************************/
1578
1579 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1580 {
1581         bool got_user_obj, got_group_obj;
1582         canon_ace *current_ace;
1583         int i, entries;
1584
1585         entries = count_canon_ace_list(ace);
1586         got_user_obj = False;
1587         got_group_obj = False;
1588
1589         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1590                 if (current_ace->type == SMB_ACL_USER_OBJ)
1591                         got_user_obj = True;
1592                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1593                         got_group_obj = True;
1594         }
1595         if (got_user_obj && got_group_obj) {
1596                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1597                 return;
1598         }
1599
1600         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1601                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1602                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1603                         current_ace->type = SMB_ACL_USER_OBJ;
1604                         got_user_obj = True;
1605                 }
1606                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1607                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1608                         current_ace->type = SMB_ACL_GROUP_OBJ;
1609                         got_group_obj = True;
1610                 }
1611         }
1612         if (!got_user_obj)
1613                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1614         if (!got_group_obj)
1615                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1616 }
1617
1618 static bool add_current_ace_to_acl(files_struct *fsp, struct security_ace *psa,
1619                                    canon_ace **file_ace, canon_ace **dir_ace,
1620                                    bool *got_file_allow, bool *got_dir_allow,
1621                                    bool *all_aces_are_inherit_only,
1622                                    canon_ace *current_ace)
1623 {
1624
1625         /*
1626          * Map the given NT permissions into a UNIX mode_t containing only
1627          * S_I(R|W|X)USR bits.
1628          */
1629
1630         current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1631         current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1632
1633         /* Store the ace_flag. */
1634         current_ace->ace_flags = psa->flags;
1635
1636         /*
1637          * Now add the created ace to either the file list, the directory
1638          * list, or both. We *MUST* preserve the order here (hence we use
1639          * DLIST_ADD_END) as NT ACLs are order dependent.
1640          */
1641
1642         if (fsp->is_directory) {
1643
1644                 /*
1645                  * We can only add to the default POSIX ACE list if the ACE is
1646                  * designed to be inherited by both files and directories.
1647                  */
1648
1649                 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1650                     (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1651
1652                         canon_ace *current_dir_ace = current_ace;
1653                         DLIST_ADD_END(*dir_ace, current_ace, canon_ace *);
1654
1655                         /*
1656                          * Note if this was an allow ace. We can't process
1657                          * any further deny ace's after this.
1658                          */
1659
1660                         if (current_ace->attr == ALLOW_ACE)
1661                                 *got_dir_allow = True;
1662
1663                         if ((current_ace->attr == DENY_ACE) && *got_dir_allow) {
1664                                 DEBUG(0,("add_current_ace_to_acl: "
1665                                          "malformed ACL in "
1666                                          "inheritable ACL! Deny entry "
1667                                          "after Allow entry. Failing "
1668                                          "to set on file %s.\n",
1669                                          fsp_str_dbg(fsp)));
1670                                 return False;
1671                         }
1672
1673                         if( DEBUGLVL( 10 )) {
1674                                 dbgtext("add_current_ace_to_acl: adding dir ACL:\n");
1675                                 print_canon_ace( current_ace, 0);
1676                         }
1677
1678                         /*
1679                          * If this is not an inherit only ACE we need to add a duplicate
1680                          * to the file acl.
1681                          */
1682
1683                         if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1684                                 canon_ace *dup_ace = dup_canon_ace(current_ace);
1685
1686                                 if (!dup_ace) {
1687                                         DEBUG(0,("add_current_ace_to_acl: malloc fail !\n"));
1688                                         return False;
1689                                 }
1690
1691                                 /*
1692                                  * We must not free current_ace here as its
1693                                  * pointer is now owned by the dir_ace list.
1694                                  */
1695                                 current_ace = dup_ace;
1696                                 /* We've essentially split this ace into two,
1697                                  * and added the ace with inheritance request
1698                                  * bits to the directory ACL. Drop those bits for
1699                                  * the ACE we're adding to the file list. */
1700                                 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1701                                                             SEC_ACE_FLAG_CONTAINER_INHERIT|
1702                                                             SEC_ACE_FLAG_INHERIT_ONLY);
1703                         } else {
1704                                 /*
1705                                  * We must not free current_ace here as its
1706                                  * pointer is now owned by the dir_ace list.
1707                                  */
1708                                 current_ace = NULL;
1709                         }
1710
1711                         /*
1712                          * current_ace is now either owned by file_ace
1713                          * or is NULL. We can safely operate on current_dir_ace
1714                          * to treat mapping for default acl entries differently
1715                          * than access acl entries.
1716                          */
1717
1718                         if (current_dir_ace->owner_type == UID_ACE) {
1719                                 /*
1720                                  * We already decided above this is a uid,
1721                                  * for default acls ace's only CREATOR_OWNER
1722                                  * maps to ACL_USER_OBJ. All other uid
1723                                  * ace's are ACL_USER.
1724                                  */
1725                                 if (dom_sid_equal(&current_dir_ace->trustee,
1726                                                   &global_sid_Creator_Owner)) {
1727                                         current_dir_ace->type = SMB_ACL_USER_OBJ;
1728                                 } else {
1729                                         current_dir_ace->type = SMB_ACL_USER;
1730                                 }
1731                         }
1732
1733                         if (current_dir_ace->owner_type == GID_ACE) {
1734                                 /*
1735                                  * We already decided above this is a gid,
1736                                  * for default acls ace's only CREATOR_GROUP
1737                                  * maps to ACL_GROUP_OBJ. All other uid
1738                                  * ace's are ACL_GROUP.
1739                                  */
1740                                 if (dom_sid_equal(&current_dir_ace->trustee,
1741                                                   &global_sid_Creator_Group)) {
1742                                         current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1743                                 } else {
1744                                         current_dir_ace->type = SMB_ACL_GROUP;
1745                                 }
1746                         }
1747                 }
1748         }
1749
1750         /*
1751          * Only add to the file ACL if not inherit only.
1752          */
1753
1754         if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1755                 DLIST_ADD_END(*file_ace, current_ace, canon_ace *);
1756
1757                 /*
1758                  * Note if this was an allow ace. We can't process
1759                  * any further deny ace's after this.
1760                  */
1761
1762                 if (current_ace->attr == ALLOW_ACE)
1763                         *got_file_allow = True;
1764
1765                 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1766                         DEBUG(0,("add_current_ace_to_acl: malformed "
1767                                  "ACL in file ACL ! Deny entry after "
1768                                  "Allow entry. Failing to set on file "
1769                                  "%s.\n", fsp_str_dbg(fsp)));
1770                         return False;
1771                 }
1772
1773                 if( DEBUGLVL( 10 )) {
1774                         dbgtext("add_current_ace_to_acl: adding file ACL:\n");
1775                         print_canon_ace( current_ace, 0);
1776                 }
1777                 *all_aces_are_inherit_only = False;
1778                 /*
1779                  * We must not free current_ace here as its
1780                  * pointer is now owned by the file_ace list.
1781                  */
1782                 current_ace = NULL;
1783         }
1784
1785         /*
1786          * Free if ACE was not added.
1787          */
1788
1789         TALLOC_FREE(current_ace);
1790         return true;
1791 }
1792
1793 /****************************************************************************
1794  Unpack a struct security_descriptor into two canonical ace lists.
1795 ****************************************************************************/
1796
1797 static bool create_canon_ace_lists(files_struct *fsp,
1798                                         const SMB_STRUCT_STAT *pst,
1799                                         struct dom_sid *pfile_owner_sid,
1800                                         struct dom_sid *pfile_grp_sid,
1801                                         canon_ace **ppfile_ace,
1802                                         canon_ace **ppdir_ace,
1803                                         const struct security_acl *dacl)
1804 {
1805         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1806         canon_ace *file_ace = NULL;
1807         canon_ace *dir_ace = NULL;
1808         canon_ace *current_ace = NULL;
1809         bool got_dir_allow = False;
1810         bool got_file_allow = False;
1811         int i, j;
1812
1813         *ppfile_ace = NULL;
1814         *ppdir_ace = NULL;
1815
1816         /*
1817          * Convert the incoming ACL into a more regular form.
1818          */
1819
1820         for(i = 0; i < dacl->num_aces; i++) {
1821                 struct security_ace *psa = &dacl->aces[i];
1822
1823                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1824                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1825                         return False;
1826                 }
1827
1828                 if (nt4_compatible_acls()) {
1829                         /*
1830                          * The security mask may be UNIX_ACCESS_NONE which should map into
1831                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1832                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1833                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1834                          */
1835
1836                         /*
1837                          * Convert GENERIC bits to specific bits.
1838                          */
1839
1840                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1841
1842                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1843
1844                         if(psa->access_mask != UNIX_ACCESS_NONE)
1845                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1846                 }
1847         }
1848
1849         /*
1850          * Deal with the fact that NT 4.x re-writes the canonical format
1851          * that we return for default ACLs. If a directory ACE is identical
1852          * to a inherited directory ACE then NT changes the bits so that the
1853          * first ACE is set to OI|IO and the second ACE for this SID is set
1854          * to CI. We need to repair this. JRA.
1855          */
1856
1857         for(i = 0; i < dacl->num_aces; i++) {
1858                 struct security_ace *psa1 = &dacl->aces[i];
1859
1860                 for (j = i + 1; j < dacl->num_aces; j++) {
1861                         struct security_ace *psa2 = &dacl->aces[j];
1862
1863                         if (psa1->access_mask != psa2->access_mask)
1864                                 continue;
1865
1866                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1867                                 continue;
1868
1869                         /*
1870                          * Ok - permission bits and SIDs are equal.
1871                          * Check if flags were re-written.
1872                          */
1873
1874                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1875
1876                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1877                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1878
1879                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1880
1881                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1882                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1883
1884                         }
1885                 }
1886         }
1887
1888         for(i = 0; i < dacl->num_aces; i++) {
1889                 struct security_ace *psa = &dacl->aces[i];
1890
1891                 /*
1892                  * Create a canon_ace entry representing this NT DACL ACE.
1893                  */
1894
1895                 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1896                         free_canon_ace_list(file_ace);
1897                         free_canon_ace_list(dir_ace);
1898                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1899                         return False;
1900                 }
1901
1902                 ZERO_STRUCTP(current_ace);
1903
1904                 sid_copy(&current_ace->trustee, &psa->trustee);
1905
1906                 /*
1907                  * Try and work out if the SID is a user or group
1908                  * as we need to flag these differently for POSIX.
1909                  * Note what kind of a POSIX ACL this should map to.
1910                  */
1911
1912                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1913                         current_ace->owner_type = WORLD_ACE;
1914                         current_ace->unix_ug.world = -1;
1915                         current_ace->type = SMB_ACL_OTHER;
1916                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1917                         current_ace->owner_type = UID_ACE;
1918                         current_ace->unix_ug.uid = pst->st_ex_uid;
1919                         current_ace->type = SMB_ACL_USER_OBJ;
1920
1921                         /*
1922                          * The Creator Owner entry only specifies inheritable permissions,
1923                          * never access permissions. WinNT doesn't always set the ACE to
1924                          * INHERIT_ONLY, though.
1925                          */
1926
1927                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1928
1929                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1930                         current_ace->owner_type = GID_ACE;
1931                         current_ace->unix_ug.gid = pst->st_ex_gid;
1932                         current_ace->type = SMB_ACL_GROUP_OBJ;
1933
1934                         /*
1935                          * The Creator Group entry only specifies inheritable permissions,
1936                          * never access permissions. WinNT doesn't always set the ACE to
1937                          * INHERIT_ONLY, though.
1938                          */
1939                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1940
1941                 } else {
1942                         struct unixid unixid;
1943
1944                         if (!sids_to_unixids(&current_ace->trustee, 1, &unixid)) {
1945                                 free_canon_ace_list(file_ace);
1946                                 free_canon_ace_list(dir_ace);
1947                                 TALLOC_FREE(current_ace);
1948                                 DEBUG(0, ("create_canon_ace_lists: sids_to_unixids "
1949                                         "failed for %s (allocation failure)\n",
1950                                         sid_string_dbg(&current_ace->trustee)));
1951                                 return false;
1952                         }
1953
1954                         if (unixid.type == ID_TYPE_BOTH) {
1955                                 /* If it's the owning user, this is a
1956                                  * user_obj, not a user.  This way, we
1957                                  * get a valid ACL for groups that own
1958                                  * files, without putting user ACL
1959                                  * entries in for groups otherwise */
1960                                 if (unixid.id == pst->st_ex_uid) {
1961                                         current_ace->owner_type = UID_ACE;
1962                                         current_ace->unix_ug.uid = unixid.id;
1963                                         current_ace->type = SMB_ACL_USER_OBJ;
1964
1965                                         /* Add the user object to the posix ACL,
1966                                            and proceed to the group mapping
1967                                            below. This handles the talloc_free
1968                                            of current_ace if not added for some
1969                                            reason */
1970                                         if (!add_current_ace_to_acl(fsp,
1971                                                         psa,
1972                                                         &file_ace,
1973                                                         &dir_ace,
1974                                                         &got_file_allow,
1975                                                         &got_dir_allow,
1976                                                         &all_aces_are_inherit_only,
1977                                                         current_ace)) {
1978                                                 free_canon_ace_list(file_ace);
1979                                                 free_canon_ace_list(dir_ace);
1980                                                 return false;
1981                                         }
1982
1983                                         if ((current_ace = talloc(talloc_tos(),
1984                                                         canon_ace)) == NULL) {
1985                                                 free_canon_ace_list(file_ace);
1986                                                 free_canon_ace_list(dir_ace);
1987                                                 DEBUG(0,("create_canon_ace_lists: "
1988                                                         "malloc fail.\n"));
1989                                                 return False;
1990                                         }
1991
1992                                         ZERO_STRUCTP(current_ace);
1993                                 }
1994
1995                                 sid_copy(&current_ace->trustee, &psa->trustee);
1996
1997                                 current_ace->unix_ug.gid = unixid.id;
1998                                 current_ace->owner_type = GID_ACE;
1999                                 /* If it's the primary group, this is a
2000                                    group_obj, not a group. */
2001                                 if (current_ace->unix_ug.gid == pst->st_ex_gid) {
2002                                         current_ace->type = SMB_ACL_GROUP_OBJ;
2003                                 } else {
2004                                         current_ace->type = SMB_ACL_GROUP;
2005                                 }
2006
2007                         } else if (unixid.type == ID_TYPE_UID) {
2008                                 current_ace->owner_type = UID_ACE;
2009                                 current_ace->unix_ug.uid = unixid.id;
2010                                 /* If it's the owning user, this is a user_obj,
2011                                    not a user. */
2012                                 if (current_ace->unix_ug.uid == pst->st_ex_uid) {
2013                                         current_ace->type = SMB_ACL_USER_OBJ;
2014                                 } else {
2015                                         current_ace->type = SMB_ACL_USER;
2016                                 }
2017                         } else if (unixid.type == ID_TYPE_GID) {
2018                                 current_ace->unix_ug.gid = unixid.id;
2019                                 current_ace->owner_type = GID_ACE;
2020                                 /* If it's the primary group, this is a
2021                                    group_obj, not a group. */
2022                                 if (current_ace->unix_ug.gid == pst->st_ex_gid) {
2023                                         current_ace->type = SMB_ACL_GROUP_OBJ;
2024                                 } else {
2025                                         current_ace->type = SMB_ACL_GROUP;
2026                                 }
2027                         } else {
2028                                 /*
2029                                  * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
2030                                  */
2031
2032                                 if (non_mappable_sid(&psa->trustee)) {
2033                                         DEBUG(10, ("create_canon_ace_lists: ignoring "
2034                                                    "non-mappable SID %s\n",
2035                                                    sid_string_dbg(&psa->trustee)));
2036                                         TALLOC_FREE(current_ace);
2037                                         continue;
2038                                 }
2039
2040                                 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
2041                                         DEBUG(10, ("create_canon_ace_lists: ignoring "
2042                                                 "unknown or foreign SID %s\n",
2043                                                 sid_string_dbg(&psa->trustee)));
2044                                         TALLOC_FREE(current_ace);
2045                                         continue;
2046                                 }
2047
2048                                 free_canon_ace_list(file_ace);
2049                                 free_canon_ace_list(dir_ace);
2050                                 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
2051                                           "%s to uid or gid.\n",
2052                                           sid_string_dbg(&current_ace->trustee)));
2053                                 TALLOC_FREE(current_ace);
2054                                 return false;
2055                         }
2056                 }
2057
2058                 /* handles the talloc_free of current_ace if not added for some reason */
2059                 if (!add_current_ace_to_acl(fsp, psa, &file_ace, &dir_ace,
2060                                             &got_file_allow, &got_dir_allow,
2061                                             &all_aces_are_inherit_only, current_ace)) {
2062                         free_canon_ace_list(file_ace);
2063                         free_canon_ace_list(dir_ace);
2064                         return false;
2065                 }
2066         }
2067
2068         if (fsp->is_directory && all_aces_are_inherit_only) {
2069                 /*
2070                  * Windows 2000 is doing one of these weird 'inherit acl'
2071                  * traverses to conserve NTFS ACL resources. Just pretend
2072                  * there was no DACL sent. JRA.
2073                  */
2074
2075                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
2076                 free_canon_ace_list(file_ace);
2077                 free_canon_ace_list(dir_ace);
2078                 file_ace = NULL;
2079                 dir_ace = NULL;
2080         } else {
2081                 /*
2082                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
2083                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
2084                  * entries can be converted to *_OBJ. Don't do this for the default
2085                  * ACL, we will create them separately for this if needed inside
2086                  * ensure_canon_entry_valid().
2087                  */
2088                 if (file_ace) {
2089                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
2090                 }
2091         }
2092
2093         *ppfile_ace = file_ace;
2094         *ppdir_ace = dir_ace;
2095
2096         return True;
2097 }
2098
2099 /****************************************************************************
2100  ASCII art time again... JRA :-).
2101
2102  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2103  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2104  entries). Secondly, the merge code has ensured that all duplicate SID entries for
2105  allow or deny have been merged, so the same SID can only appear once in the deny
2106  list or once in the allow list.
2107
2108  We then process as follows :
2109
2110  ---------------------------------------------------------------------------
2111  First pass - look for a Everyone DENY entry.
2112
2113  If it is deny all (rwx) trunate the list at this point.
2114  Else, walk the list from this point and use the deny permissions of this
2115  entry as a mask on all following allow entries. Finally, delete
2116  the Everyone DENY entry (we have applied it to everything possible).
2117
2118  In addition, in this pass we remove any DENY entries that have
2119  no permissions (ie. they are a DENY nothing).
2120  ---------------------------------------------------------------------------
2121  Second pass - only deal with deny user entries.
2122
2123  DENY user1 (perms XXX)
2124
2125  new_perms = 0
2126  for all following allow group entries where user1 is in group
2127         new_perms |= group_perms;
2128
2129  user1 entry perms = new_perms & ~ XXX;
2130
2131  Convert the deny entry to an allow entry with the new perms and
2132  push to the end of the list. Note if the user was in no groups
2133  this maps to a specific allow nothing entry for this user.
2134
2135  The common case from the NT ACL choser (userX deny all) is
2136  optimised so we don't do the group lookup - we just map to
2137  an allow nothing entry.
2138
2139  What we're doing here is inferring the allow permissions the
2140  person setting the ACE on user1 wanted by looking at the allow
2141  permissions on the groups the user is currently in. This will
2142  be a snapshot, depending on group membership but is the best
2143  we can do and has the advantage of failing closed rather than
2144  open.
2145  ---------------------------------------------------------------------------
2146  Third pass - only deal with deny group entries.
2147
2148  DENY group1 (perms XXX)
2149
2150  for all following allow user entries where user is in group1
2151    user entry perms = user entry perms & ~ XXX;
2152
2153  If there is a group Everyone allow entry with permissions YYY,
2154  convert the group1 entry to an allow entry and modify its
2155  permissions to be :
2156
2157  new_perms = YYY & ~ XXX
2158
2159  and push to the end of the list.
2160
2161  If there is no group Everyone allow entry then convert the
2162  group1 entry to a allow nothing entry and push to the end of the list.
2163
2164  Note that the common case from the NT ACL choser (groupX deny all)
2165  cannot be optimised here as we need to modify user entries who are
2166  in the group to change them to a deny all also.
2167
2168  What we're doing here is modifying the allow permissions of
2169  user entries (which are more specific in POSIX ACLs) to mask
2170  out the explicit deny set on the group they are in. This will
2171  be a snapshot depending on current group membership but is the
2172  best we can do and has the advantage of failing closed rather
2173  than open.
2174  ---------------------------------------------------------------------------
2175  Fourth pass - cope with cumulative permissions.
2176
2177  for all allow user entries, if there exists an allow group entry with
2178  more permissive permissions, and the user is in that group, rewrite the
2179  allow user permissions to contain both sets of permissions.
2180
2181  Currently the code for this is #ifdef'ed out as these semantics make
2182  no sense to me. JRA.
2183  ---------------------------------------------------------------------------
2184
2185  Note we *MUST* do the deny user pass first as this will convert deny user
2186  entries into allow user entries which can then be processed by the deny
2187  group pass.
2188
2189  The above algorithm took a *lot* of thinking about - hence this
2190  explaination :-). JRA.
2191 ****************************************************************************/
2192
2193 /****************************************************************************
2194  Process a canon_ace list entries. This is very complex code. We need
2195  to go through and remove the "deny" permissions from any allow entry that matches
2196  the id of this entry. We have already refused any NT ACL that wasn't in correct
2197  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2198  we just remove it (to fail safe). We have already removed any duplicate ace
2199  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2200  allow entries.
2201 ****************************************************************************/
2202
2203 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2204 {
2205         canon_ace *ace_list = *pp_ace_list;
2206         canon_ace *curr_ace = NULL;
2207         canon_ace *curr_ace_next = NULL;
2208
2209         /* Pass 1 above - look for an Everyone, deny entry. */
2210
2211         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2212                 canon_ace *allow_ace_p;
2213
2214                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2215
2216                 if (curr_ace->attr != DENY_ACE)
2217                         continue;
2218
2219                 if (curr_ace->perms == (mode_t)0) {
2220
2221                         /* Deny nothing entry - delete. */
2222
2223                         DLIST_REMOVE(ace_list, curr_ace);
2224                         continue;
2225                 }
2226
2227                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2228                         continue;
2229
2230                 /* JRATEST - assert. */
2231                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2232
2233                 if (curr_ace->perms == ALL_ACE_PERMS) {
2234
2235                         /*
2236                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2237                          * list at this point including this entry.
2238                          */
2239
2240                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2241
2242                         free_canon_ace_list( curr_ace );
2243                         if (prev_entry)
2244                                 DLIST_REMOVE(ace_list, prev_entry);
2245                         else {
2246                                 /* We deleted the entire list. */
2247                                 ace_list = NULL;
2248                         }
2249                         break;
2250                 }
2251
2252                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2253
2254                         /*
2255                          * Only mask off allow entries.
2256                          */
2257
2258                         if (allow_ace_p->attr != ALLOW_ACE)
2259                                 continue;
2260
2261                         allow_ace_p->perms &= ~curr_ace->perms;
2262                 }
2263
2264                 /*
2265                  * Now it's been applied, remove it.
2266                  */
2267
2268                 DLIST_REMOVE(ace_list, curr_ace);
2269         }
2270
2271         /* Pass 2 above - deal with deny user entries. */
2272
2273         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2274                 mode_t new_perms = (mode_t)0;
2275                 canon_ace *allow_ace_p;
2276
2277                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2278
2279                 if (curr_ace->attr != DENY_ACE)
2280                         continue;
2281
2282                 if (curr_ace->owner_type != UID_ACE)
2283                         continue;
2284
2285                 if (curr_ace->perms == ALL_ACE_PERMS) {
2286
2287                         /*
2288                          * Optimisation - this is a deny everything to this user.
2289                          * Convert to an allow nothing and push to the end of the list.
2290                          */
2291
2292                         curr_ace->attr = ALLOW_ACE;
2293                         curr_ace->perms = (mode_t)0;
2294                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2295                         continue;
2296                 }
2297
2298                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2299
2300                         if (allow_ace_p->attr != ALLOW_ACE)
2301                                 continue;
2302
2303                         /* We process GID_ACE and WORLD_ACE entries only. */
2304
2305                         if (allow_ace_p->owner_type == UID_ACE)
2306                                 continue;
2307
2308                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2309                                 new_perms |= allow_ace_p->perms;
2310                 }
2311
2312                 /*
2313                  * Convert to a allow entry, modify the perms and push to the end
2314                  * of the list.
2315                  */
2316
2317                 curr_ace->attr = ALLOW_ACE;
2318                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2319                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2320         }
2321
2322         /* Pass 3 above - deal with deny group entries. */
2323
2324         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2325                 canon_ace *allow_ace_p;
2326                 canon_ace *allow_everyone_p = NULL;
2327
2328                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2329
2330                 if (curr_ace->attr != DENY_ACE)
2331                         continue;
2332
2333                 if (curr_ace->owner_type != GID_ACE)
2334                         continue;
2335
2336                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2337
2338                         if (allow_ace_p->attr != ALLOW_ACE)
2339                                 continue;
2340
2341                         /* Store a pointer to the Everyone allow, if it exists. */
2342                         if (allow_ace_p->owner_type == WORLD_ACE)
2343                                 allow_everyone_p = allow_ace_p;
2344
2345                         /* We process UID_ACE entries only. */
2346
2347                         if (allow_ace_p->owner_type != UID_ACE)
2348                                 continue;
2349
2350                         /* Mask off the deny group perms. */
2351
2352                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2353                                 allow_ace_p->perms &= ~curr_ace->perms;
2354                 }
2355
2356                 /*
2357                  * Convert the deny to an allow with the correct perms and
2358                  * push to the end of the list.
2359                  */
2360
2361                 curr_ace->attr = ALLOW_ACE;
2362                 if (allow_everyone_p)
2363                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2364                 else
2365                         curr_ace->perms = (mode_t)0;
2366                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2367         }
2368
2369         /* Doing this fourth pass allows Windows semantics to be layered
2370          * on top of POSIX semantics. I'm not sure if this is desirable.
2371          * For example, in W2K ACLs there is no way to say, "Group X no
2372          * access, user Y full access" if user Y is a member of group X.
2373          * This seems completely broken semantics to me.... JRA.
2374          */
2375
2376 #if 0
2377         /* Pass 4 above - deal with allow entries. */
2378
2379         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2380                 canon_ace *allow_ace_p;
2381
2382                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2383
2384                 if (curr_ace->attr != ALLOW_ACE)
2385                         continue;
2386
2387                 if (curr_ace->owner_type != UID_ACE)
2388                         continue;
2389
2390                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2391
2392                         if (allow_ace_p->attr != ALLOW_ACE)
2393                                 continue;
2394
2395                         /* We process GID_ACE entries only. */
2396
2397                         if (allow_ace_p->owner_type != GID_ACE)
2398                                 continue;
2399
2400                         /* OR in the group perms. */
2401
2402                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2403                                 curr_ace->perms |= allow_ace_p->perms;
2404                 }
2405         }
2406 #endif
2407
2408         *pp_ace_list = ace_list;
2409 }
2410
2411 /****************************************************************************
2412  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2413  succeeding.
2414 ****************************************************************************/
2415
2416 static bool unpack_canon_ace(files_struct *fsp,
2417                                 const SMB_STRUCT_STAT *pst,
2418                                 struct dom_sid *pfile_owner_sid,
2419                                 struct dom_sid *pfile_grp_sid,
2420                                 canon_ace **ppfile_ace,
2421                                 canon_ace **ppdir_ace,
2422                                 uint32 security_info_sent,
2423                                 const struct security_descriptor *psd)
2424 {
2425         canon_ace *file_ace = NULL;
2426         canon_ace *dir_ace = NULL;
2427
2428         *ppfile_ace = NULL;
2429         *ppdir_ace = NULL;
2430
2431         if(security_info_sent == 0) {
2432                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2433                 return False;
2434         }
2435
2436         /*
2437          * If no DACL then this is a chown only security descriptor.
2438          */
2439
2440         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2441                 return True;
2442
2443         /*
2444          * Now go through the DACL and create the canon_ace lists.
2445          */
2446
2447         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2448                                                                 &file_ace, &dir_ace, psd->dacl))
2449                 return False;
2450
2451         if ((file_ace == NULL) && (dir_ace == NULL)) {
2452                 /* W2K traverse DACL set - ignore. */
2453                 return True;
2454         }
2455
2456         /*
2457          * Go through the canon_ace list and merge entries
2458          * belonging to identical users of identical allow or deny type.
2459          * We can do this as all deny entries come first, followed by
2460          * all allow entries (we have mandated this before accepting this acl).
2461          */
2462
2463         print_canon_ace_list( "file ace - before merge", file_ace);
2464         merge_aces( &file_ace, false);
2465
2466         print_canon_ace_list( "dir ace - before merge", dir_ace);
2467         merge_aces( &dir_ace, true);
2468
2469         /*
2470          * NT ACLs are order dependent. Go through the acl lists and
2471          * process DENY entries by masking the allow entries.
2472          */
2473
2474         print_canon_ace_list( "file ace - before deny", file_ace);
2475         process_deny_list(fsp->conn, &file_ace);
2476
2477         print_canon_ace_list( "dir ace - before deny", dir_ace);
2478         process_deny_list(fsp->conn, &dir_ace);
2479
2480         /*
2481          * A well formed POSIX file or default ACL has at least 3 entries, a
2482          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2483          * and optionally a mask entry. Ensure this is the case.
2484          */
2485
2486         print_canon_ace_list( "file ace - before valid", file_ace);
2487
2488         if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2489                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2490                 free_canon_ace_list(file_ace);
2491                 free_canon_ace_list(dir_ace);
2492                 return False;
2493         }
2494
2495         print_canon_ace_list( "dir ace - before valid", dir_ace);
2496
2497         if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2498                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2499                 free_canon_ace_list(file_ace);
2500                 free_canon_ace_list(dir_ace);
2501                 return False;
2502         }
2503
2504         print_canon_ace_list( "file ace - return", file_ace);
2505         print_canon_ace_list( "dir ace - return", dir_ace);
2506
2507         *ppfile_ace = file_ace;
2508         *ppdir_ace = dir_ace;
2509         return True;
2510
2511 }
2512
2513 /******************************************************************************
2514  When returning permissions, try and fit NT display
2515  semantics if possible. Note the the canon_entries here must have been malloced.
2516  The list format should be - first entry = owner, followed by group and other user
2517  entries, last entry = other.
2518
2519  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2520  are not ordered, and match on the most specific entry rather than walking a list,
2521  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2522
2523  Entry 0: owner : deny all except read and write.
2524  Entry 1: owner : allow read and write.
2525  Entry 2: group : deny all except read.
2526  Entry 3: group : allow read.
2527  Entry 4: Everyone : allow read.
2528
2529  But NT cannot display this in their ACL editor !
2530 ********************************************************************************/
2531
2532 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2533 {
2534         canon_ace *l_head = *pp_list_head;
2535         canon_ace *owner_ace = NULL;
2536         canon_ace *other_ace = NULL;
2537         canon_ace *ace = NULL;
2538
2539         for (ace = l_head; ace; ace = ace->next) {
2540                 if (ace->type == SMB_ACL_USER_OBJ)
2541                         owner_ace = ace;
2542                 else if (ace->type == SMB_ACL_OTHER) {
2543                         /* Last ace - this is "other" */
2544                         other_ace = ace;
2545                 }
2546         }
2547
2548         if (!owner_ace || !other_ace) {
2549                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2550                         filename ));
2551                 return;
2552         }
2553
2554         /*
2555          * The POSIX algorithm applies to owner first, and other last,
2556          * so ensure they are arranged in this order.
2557          */
2558
2559         if (owner_ace) {
2560                 DLIST_PROMOTE(l_head, owner_ace);
2561         }
2562
2563         if (other_ace) {
2564                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2565         }
2566
2567         /* We have probably changed the head of the list. */
2568
2569         *pp_list_head = l_head;
2570 }
2571
2572 /****************************************************************************
2573  Create a linked list of canonical ACE entries.
2574 ****************************************************************************/
2575
2576 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2577                                    const char *fname, SMB_ACL_T posix_acl,
2578                                    const SMB_STRUCT_STAT *psbuf,
2579                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2580 {
2581         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2582         canon_ace *l_head = NULL;
2583         canon_ace *ace = NULL;
2584         canon_ace *next_ace = NULL;
2585         int entry_id = SMB_ACL_FIRST_ENTRY;
2586         SMB_ACL_ENTRY_T entry;
2587         size_t ace_count;
2588
2589         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2590                 SMB_ACL_TAG_T tagtype;
2591                 SMB_ACL_PERMSET_T permset;
2592                 struct dom_sid sid;
2593                 posix_id unix_ug;
2594                 enum ace_owner owner_type;
2595
2596                 entry_id = SMB_ACL_NEXT_ENTRY;
2597
2598                 /* Is this a MASK entry ? */
2599                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2600                         continue;
2601
2602                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2603                         continue;
2604
2605                 /* Decide which SID to use based on the ACL type. */
2606                 switch(tagtype) {
2607                         case SMB_ACL_USER_OBJ:
2608                                 /* Get the SID from the owner. */
2609                                 sid_copy(&sid, powner);
2610                                 unix_ug.uid = psbuf->st_ex_uid;
2611                                 owner_type = UID_ACE;
2612                                 break;
2613                         case SMB_ACL_USER:
2614                                 {
2615                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2616                                         if (puid == NULL) {
2617                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2618                                                 continue;
2619                                         }
2620                                         uid_to_sid( &sid, *puid);
2621                                         unix_ug.uid = *puid;
2622                                         owner_type = UID_ACE;
2623                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2624                                         break;
2625                                 }
2626                         case SMB_ACL_GROUP_OBJ:
2627                                 /* Get the SID from the owning group. */
2628                                 sid_copy(&sid, pgroup);
2629                                 unix_ug.gid = psbuf->st_ex_gid;
2630                                 owner_type = GID_ACE;
2631                                 break;
2632                         case SMB_ACL_GROUP:
2633                                 {
2634                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2635                                         if (pgid == NULL) {
2636                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2637                                                 continue;
2638                                         }
2639                                         gid_to_sid( &sid, *pgid);
2640                                         unix_ug.gid = *pgid;
2641                                         owner_type = GID_ACE;
2642                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2643                                         break;
2644                                 }
2645                         case SMB_ACL_MASK:
2646                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2647                                 continue; /* Don't count the mask as an entry. */
2648                         case SMB_ACL_OTHER:
2649                                 /* Use the Everyone SID */
2650                                 sid = global_sid_World;
2651                                 unix_ug.world = -1;
2652                                 owner_type = WORLD_ACE;
2653                                 break;
2654                         default:
2655                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2656                                 continue;
2657                 }
2658
2659                 /*
2660                  * Add this entry to the list.
2661                  */
2662
2663                 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2664                         goto fail;
2665
2666                 ZERO_STRUCTP(ace);
2667                 ace->type = tagtype;
2668                 ace->perms = convert_permset_to_mode_t(conn, permset);
2669                 ace->attr = ALLOW_ACE;
2670                 ace->trustee = sid;
2671                 ace->unix_ug = unix_ug;
2672                 ace->owner_type = owner_type;
2673                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2674
2675                 DLIST_ADD(l_head, ace);
2676         }
2677
2678         /*
2679          * This next call will ensure we have at least a user/group/world set.
2680          */
2681
2682         if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2683                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2684                                       psbuf, False))
2685                 goto fail;
2686
2687         /*
2688          * Now go through the list, masking the permissions with the
2689          * acl_mask. Ensure all DENY Entries are at the start of the list.
2690          */
2691
2692         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2693
2694         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2695                 next_ace = ace->next;
2696
2697                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2698                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2699                         ace->perms &= acl_mask;
2700
2701                 if (ace->perms == 0) {
2702                         DLIST_PROMOTE(l_head, ace);
2703                 }
2704
2705                 if( DEBUGLVL( 10 ) ) {
2706                         print_canon_ace(ace, ace_count);
2707                 }
2708         }
2709
2710         arrange_posix_perms(fname,&l_head );
2711
2712         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2713
2714         return l_head;
2715
2716   fail:
2717
2718         free_canon_ace_list(l_head);
2719         return NULL;
2720 }
2721
2722 /****************************************************************************
2723  Check if the current user group list contains a given group.
2724 ****************************************************************************/
2725
2726 bool current_user_in_group(connection_struct *conn, gid_t gid)
2727 {
2728         int i;
2729         const struct security_unix_token *utok = get_current_utok(conn);
2730
2731         for (i = 0; i < utok->ngroups; i++) {
2732                 if (utok->groups[i] == gid) {
2733                         return True;
2734                 }
2735         }
2736
2737         return False;
2738 }
2739
2740 /****************************************************************************
2741  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2742 ****************************************************************************/
2743
2744 static bool acl_group_override(connection_struct *conn,
2745                                const struct smb_filename *smb_fname)
2746 {
2747         if ((errno != EPERM) && (errno != EACCES)) {
2748                 return false;
2749         }
2750
2751         /* file primary group == user primary or supplementary group */
2752         if (lp_acl_group_control(SNUM(conn)) &&
2753             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2754                 return true;
2755         }
2756
2757         /* user has writeable permission */
2758         if (lp_dos_filemode(SNUM(conn)) &&
2759             can_write_to_file(conn, smb_fname)) {
2760                 return true;
2761         }
2762
2763         return false;
2764 }
2765
2766 /****************************************************************************
2767  Attempt to apply an ACL to a file or directory.
2768 ****************************************************************************/
2769
2770 static bool set_canon_ace_list(files_struct *fsp,
2771                                 canon_ace *the_ace,
2772                                 bool default_ace,
2773                                 const SMB_STRUCT_STAT *psbuf,
2774                                 bool *pacl_set_support)
2775 {
2776         connection_struct *conn = fsp->conn;
2777         bool ret = False;
2778         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2779         canon_ace *p_ace;
2780         int i;
2781         SMB_ACL_ENTRY_T mask_entry;
2782         bool got_mask_entry = False;
2783         SMB_ACL_PERMSET_T mask_permset;
2784         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2785         bool needs_mask = False;
2786         mode_t mask_perms = 0;
2787
2788         /* Use the psbuf that was passed in. */
2789         if (psbuf != &fsp->fsp_name->st) {
2790                 fsp->fsp_name->st = *psbuf;
2791         }
2792
2793 #if defined(POSIX_ACL_NEEDS_MASK)
2794         /* HP-UX always wants to have a mask (called "class" there). */
2795         needs_mask = True;
2796 #endif
2797
2798         if (the_acl == NULL) {
2799
2800                 if (!no_acl_syscall_error(errno)) {
2801                         /*
2802                          * Only print this error message if we have some kind of ACL
2803                          * support that's not working. Otherwise we would always get this.
2804                          */
2805                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2806                                 default_ace ? "default" : "file", strerror(errno) ));
2807                 }
2808                 *pacl_set_support = False;
2809                 goto fail;
2810         }
2811
2812         if( DEBUGLVL( 10 )) {
2813                 dbgtext("set_canon_ace_list: setting ACL:\n");
2814                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2815                         print_canon_ace( p_ace, i);
2816                 }
2817         }
2818
2819         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2820                 SMB_ACL_ENTRY_T the_entry;
2821                 SMB_ACL_PERMSET_T the_permset;
2822
2823                 /*
2824                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2825                  * named group entries. But if there is an ACL_MASK entry, it applies
2826                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2827                  * so that it doesn't deny (i.e., mask off) any permissions.
2828                  */
2829
2830                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2831                         needs_mask = True;
2832                         mask_perms |= p_ace->perms;
2833                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2834                         mask_perms |= p_ace->perms;
2835                 }
2836
2837                 /*
2838                  * Get the entry for this ACE.
2839                  */
2840
2841                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2842                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2843                                 i, strerror(errno) ));
2844                         goto fail;
2845                 }
2846
2847                 if (p_ace->type == SMB_ACL_MASK) {
2848                         mask_entry = the_entry;
2849                         got_mask_entry = True;
2850                 }
2851
2852                 /*
2853                  * Ok - we now know the ACL calls should be working, don't
2854                  * allow fallback to chmod.
2855                  */
2856
2857                 *pacl_set_support = True;
2858
2859                 /*
2860                  * Initialise the entry from the canon_ace.
2861                  */
2862
2863                 /*
2864                  * First tell the entry what type of ACE this is.
2865                  */
2866
2867                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2868                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2869                                 i, strerror(errno) ));
2870                         goto fail;
2871                 }
2872
2873                 /*
2874                  * Only set the qualifier (user or group id) if the entry is a user
2875                  * or group id ACE.
2876                  */
2877
2878                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2879                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2880                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2881                                         i, strerror(errno) ));
2882                                 goto fail;
2883                         }
2884                 }
2885
2886                 /*
2887                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2888                  */
2889
2890                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2891                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2892                                 i, strerror(errno) ));
2893                         goto fail;
2894                 }
2895
2896                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2897                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2898                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2899                         goto fail;
2900                 }
2901
2902                 /*
2903                  * ..and apply them to the entry.
2904                  */
2905
2906                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2907                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2908                                 i, strerror(errno) ));
2909                         goto fail;
2910                 }
2911
2912                 if( DEBUGLVL( 10 ))
2913                         print_canon_ace( p_ace, i);
2914
2915         }
2916
2917         if (needs_mask && !got_mask_entry) {
2918                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2919                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2920                         goto fail;
2921                 }
2922
2923                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2924                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2925                         goto fail;
2926                 }
2927
2928                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2929                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2930                         goto fail;
2931                 }
2932
2933                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2934                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2935                         goto fail;
2936                 }
2937
2938                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2939                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2940                         goto fail;
2941                 }
2942         }
2943
2944         /*
2945          * Finally apply it to the file or directory.
2946          */
2947
2948         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2949                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2950                                              the_acl_type, the_acl) == -1) {
2951                         /*
2952                          * Some systems allow all the above calls and only fail with no ACL support
2953                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2954                          */
2955                         if (no_acl_syscall_error(errno)) {
2956                                 *pacl_set_support = False;
2957                         }
2958
2959                         if (acl_group_override(conn, fsp->fsp_name)) {
2960                                 int sret;
2961
2962                                 DEBUG(5,("set_canon_ace_list: acl group "
2963                                          "control on and current user in file "
2964                                          "%s primary group.\n",
2965                                          fsp_str_dbg(fsp)));
2966
2967                                 become_root();
2968                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2969                                     fsp->fsp_name->base_name, the_acl_type,
2970                                     the_acl);
2971                                 unbecome_root();
2972                                 if (sret == 0) {
2973                                         ret = True;
2974                                 }
2975                         }
2976
2977                         if (ret == False) {
2978                                 DEBUG(2,("set_canon_ace_list: "
2979                                          "sys_acl_set_file type %s failed for "
2980                                          "file %s (%s).\n",
2981                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2982                                          "directory default" : "file",
2983                                          fsp_str_dbg(fsp), strerror(errno)));
2984                                 goto fail;
2985                         }
2986                 }
2987         } else {
2988                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2989                         /*
2990                          * Some systems allow all the above calls and only fail with no ACL support
2991                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2992                          */
2993                         if (no_acl_syscall_error(errno)) {
2994                                 *pacl_set_support = False;
2995                         }
2996
2997                         if (acl_group_override(conn, fsp->fsp_name)) {
2998                                 int sret;
2999
3000                                 DEBUG(5,("set_canon_ace_list: acl group "
3001                                          "control on and current user in file "
3002                                          "%s primary group.\n",
3003                                          fsp_str_dbg(fsp)));
3004
3005                                 become_root();
3006                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
3007                                 unbecome_root();
3008                                 if (sret == 0) {
3009                                         ret = True;
3010                                 }
3011                         }
3012
3013                         if (ret == False) {
3014                                 DEBUG(2,("set_canon_ace_list: "
3015                                          "sys_acl_set_file failed for file %s "
3016                                          "(%s).\n",
3017                                          fsp_str_dbg(fsp), strerror(errno)));
3018                                 goto fail;
3019                         }
3020                 }
3021         }
3022
3023         ret = True;
3024
3025   fail:
3026
3027         if (the_acl != NULL) {
3028                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
3029         }
3030
3031         return ret;
3032 }
3033
3034 /****************************************************************************
3035  Find a particular canon_ace entry.
3036 ****************************************************************************/
3037
3038 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
3039 {
3040         while (list) {
3041                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
3042                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
3043                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
3044                         break;
3045                 list = list->next;
3046         }
3047         return list;
3048 }
3049
3050 /****************************************************************************
3051
3052 ****************************************************************************/
3053
3054 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
3055 {
3056         SMB_ACL_ENTRY_T entry;
3057
3058         if (!the_acl)
3059                 return NULL;
3060         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
3061                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
3062                 return NULL;
3063         }
3064         return the_acl;
3065 }
3066
3067 /****************************************************************************
3068  Convert a canon_ace to a generic 3 element permission - if possible.
3069 ****************************************************************************/
3070
3071 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3072
3073 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3074 {
3075         int snum = SNUM(fsp->conn);
3076         size_t ace_count = count_canon_ace_list(file_ace_list);
3077         canon_ace *ace_p;
3078         canon_ace *owner_ace = NULL;
3079         canon_ace *group_ace = NULL;
3080         canon_ace *other_ace = NULL;
3081         mode_t and_bits;
3082         mode_t or_bits;
3083
3084         if (ace_count != 3) {
3085                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3086                          "entries for file %s to convert to posix perms.\n",
3087                          fsp_str_dbg(fsp)));
3088                 return False;
3089         }
3090
3091         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3092                 if (ace_p->owner_type == UID_ACE)
3093                         owner_ace = ace_p;
3094                 else if (ace_p->owner_type == GID_ACE)
3095                         group_ace = ace_p;
3096                 else if (ace_p->owner_type == WORLD_ACE)
3097                         other_ace = ace_p;
3098         }
3099
3100         if (!owner_ace || !group_ace || !other_ace) {
3101                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3102                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3103                 return False;
3104         }
3105
3106         *posix_perms = (mode_t)0;
3107
3108         *posix_perms |= owner_ace->perms;
3109         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3110         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3111         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3112         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3113         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3114         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3115
3116         /* The owner must have at least read access. */
3117
3118         *posix_perms |= S_IRUSR;
3119         if (fsp->is_directory)
3120                 *posix_perms |= (S_IWUSR|S_IXUSR);
3121
3122         /* If requested apply the masks. */
3123
3124         /* Get the initial bits to apply. */
3125
3126         if (fsp->is_directory) {
3127                 and_bits = lp_dir_security_mask(snum);
3128                 or_bits = lp_force_dir_security_mode(snum);
3129         } else {
3130                 and_bits = lp_security_mask(snum);
3131                 or_bits = lp_force_security_mode(snum);
3132         }
3133
3134         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3135
3136         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3137                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3138                   (int)group_ace->perms, (int)other_ace->perms,
3139                   (int)*posix_perms, fsp_str_dbg(fsp)));
3140
3141         return True;
3142 }
3143
3144 /****************************************************************************
3145   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3146   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3147   with CI|OI set so it is inherited and also applies to the directory.
3148   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3149 ****************************************************************************/
3150
3151 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3152 {
3153         size_t i, j;
3154
3155         for (i = 0; i < num_aces; i++) {
3156                 for (j = i+1; j < num_aces; j++) {
3157                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3158                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3159                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3160                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3161
3162                         /* We know the lower number ACE's are file entries. */
3163                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3164                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3165                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3166                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3167                                 (i_inh == j_inh) &&
3168                                 (i_flags_ni == 0) &&
3169                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3170                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3171                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3172                                 /*
3173                                  * W2K wants to have access allowed zero access ACE's
3174                                  * at the end of the list. If the mask is zero, merge
3175                                  * the non-inherited ACE onto the inherited ACE.
3176                                  */
3177
3178                                 if (nt_ace_list[i].access_mask == 0) {
3179                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3180                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3181                                         if (num_aces - i - 1 > 0)
3182                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3183                                                                 sizeof(struct security_ace));
3184
3185                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3186                                                 (unsigned int)i, (unsigned int)j ));
3187                                 } else {
3188                                         /*
3189                                          * These are identical except for the flags.
3190                                          * Merge the inherited ACE onto the non-inherited ACE.
3191                                          */
3192
3193                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3194                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3195                                         if (num_aces - j - 1 > 0)
3196                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3197                                                                 sizeof(struct security_ace));
3198
3199                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3200                                                 (unsigned int)j, (unsigned int)i ));
3201                                 }
3202                                 num_aces--;
3203                                 break;
3204                         }
3205                 }
3206         }
3207
3208         return num_aces;
3209 }
3210
3211 /*
3212  * Add or Replace ACE entry.
3213  * In some cases we need to add a specific ACE for compatibility reasons.
3214  * When doing that we must make sure we are not actually creating a duplicate
3215  * entry. So we need to search whether an ACE entry already exist and eventually
3216  * replacce the access mask, or add a completely new entry if none was found.
3217  *
3218  * This function assumes the array has enough space to add a new entry without
3219  * any reallocation of memory.
3220  */
3221
3222 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3223                                 const struct dom_sid *sid, enum security_ace_type type,
3224                                 uint32_t mask, uint8_t flags)
3225 {
3226         int i;
3227
3228         /* first search for a duplicate */
3229         for (i = 0; i < *num_aces; i++) {
3230                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3231                     (nt_ace_list[i].flags == flags)) break;
3232         }
3233
3234         if (i < *num_aces) { /* found */
3235                 nt_ace_list[i].type = type;
3236                 nt_ace_list[i].access_mask = mask;
3237                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3238                            i, sid_string_dbg(sid), flags));
3239                 return;
3240         }
3241
3242         /* not found, append it */
3243         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3244 }
3245
3246
3247 /****************************************************************************
3248  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3249  the space for the return elements and returns the size needed to return the
3250  security descriptor. This should be the only external function needed for
3251  the UNIX style get ACL.
3252 ****************************************************************************/
3253
3254 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3255                                       const char *name,
3256                                       const SMB_STRUCT_STAT *sbuf,
3257                                       struct pai_val *pal,
3258                                       SMB_ACL_T posix_acl,
3259                                       SMB_ACL_T def_acl,
3260                                       uint32_t security_info,
3261                                       struct security_descriptor **ppdesc)
3262 {
3263         struct dom_sid owner_sid;
3264         struct dom_sid group_sid;
3265         size_t sd_size = 0;
3266         struct security_acl *psa = NULL;
3267         size_t num_acls = 0;
3268         size_t num_def_acls = 0;
3269         size_t num_aces = 0;
3270         canon_ace *file_ace = NULL;
3271         canon_ace *dir_ace = NULL;
3272         struct security_ace *nt_ace_list = NULL;
3273         size_t num_profile_acls = 0;
3274         struct dom_sid orig_owner_sid;
3275         struct security_descriptor *psd = NULL;
3276         int i;
3277
3278         /*
3279          * Get the owner, group and world SIDs.
3280          */
3281
3282         create_file_sids(sbuf, &owner_sid, &group_sid);
3283
3284         if (lp_profile_acls(SNUM(conn))) {
3285                 /* For WXP SP1 the owner must be administrators. */
3286                 sid_copy(&orig_owner_sid, &owner_sid);
3287                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3288                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3289                 num_profile_acls = 3;
3290         }
3291
3292         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3293
3294                 /*
3295                  * In the optimum case Creator Owner and Creator Group would be used for
3296                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3297                  * would lead to usability problems under Windows: The Creator entries
3298                  * are only available in browse lists of directories and not for files;
3299                  * additionally the identity of the owning group couldn't be determined.
3300                  * We therefore use those identities only for Default ACLs.
3301                  */
3302
3303                 /* Create the canon_ace lists. */
3304                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3305                                             &owner_sid, &group_sid, pal,
3306                                             SMB_ACL_TYPE_ACCESS);
3307
3308                 /* We must have *some* ACLS. */
3309
3310                 if (count_canon_ace_list(file_ace) == 0) {
3311                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3312                         goto done;
3313                 }
3314
3315                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3316                         dir_ace = canonicalise_acl(conn, name, def_acl,
3317                                                    sbuf,
3318                                                    &global_sid_Creator_Owner,
3319                                                    &global_sid_Creator_Group,
3320                                                    pal, SMB_ACL_TYPE_DEFAULT);
3321                 }
3322
3323                 /*
3324                  * Create the NT ACE list from the canonical ace lists.
3325                  */
3326
3327                 {
3328                         canon_ace *ace;
3329                         enum security_ace_type nt_acl_type;
3330
3331                         if (nt4_compatible_acls() && dir_ace) {
3332                                 /*
3333                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3334                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3335                                  * remove entries from the Access ACL if the
3336                                  * corresponding Default ACL entries have also been
3337                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3338                                  * are exceptions. We can do nothing
3339                                  * intelligent if the Default ACL contains entries that
3340                                  * are not also contained in the Access ACL, so this
3341                                  * case will still fail under NT 4.
3342                                  */
3343
3344                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3345                                 if (ace && !ace->perms) {
3346                                         DLIST_REMOVE(dir_ace, ace);
3347                                         TALLOC_FREE(ace);
3348
3349                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3350                                         if (ace && !ace->perms) {
3351                                                 DLIST_REMOVE(file_ace, ace);
3352                                                 TALLOC_FREE(ace);
3353                                         }
3354                                 }
3355
3356                                 /*
3357                                  * WinNT doesn't usually have Creator Group
3358                                  * in browse lists, so we send this entry to
3359                                  * WinNT even if it contains no relevant
3360                                  * permissions. Once we can add
3361                                  * Creator Group to browse lists we can
3362                                  * re-enable this.
3363                                  */
3364
3365 #if 0
3366                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3367                                 if (ace && !ace->perms) {
3368                                         DLIST_REMOVE(dir_ace, ace);
3369                                         TALLOC_FREE(ace);
3370                                 }
3371 #endif
3372
3373                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3374                                 if (ace && !ace->perms) {
3375                                         DLIST_REMOVE(file_ace, ace);
3376                                         TALLOC_FREE(ace);
3377                                 }
3378                         }
3379
3380                         num_acls = count_canon_ace_list(file_ace);
3381                         num_def_acls = count_canon_ace_list(dir_ace);
3382
3383                         /* Allocate the ace list. */
3384                         if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3385                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3386                                 goto done;
3387                         }
3388
3389                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3390
3391                         /*
3392                          * Create the NT ACE list from the canonical ace lists.
3393                          */
3394
3395                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3396                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3397                                                 &nt_acl_type,
3398                                                 ace->perms,
3399                                                 S_ISDIR(sbuf->st_ex_mode));
3400                                 init_sec_ace(&nt_ace_list[num_aces++],
3401                                         &ace->trustee,
3402                                         nt_acl_type,
3403                                         acc,
3404                                         ace->ace_flags);
3405                         }
3406
3407                         /* The User must have access to a profile share - even
3408                          * if we can't map the SID. */
3409                         if (lp_profile_acls(SNUM(conn))) {
3410                                 add_or_replace_ace(nt_ace_list, &num_aces,
3411                                                    &global_sid_Builtin_Users,
3412                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3413                                                    FILE_GENERIC_ALL, 0);
3414                         }
3415
3416                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3417                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3418                                                 &nt_acl_type,
3419                                                 ace->perms,
3420                                                 S_ISDIR(sbuf->st_ex_mode));
3421                                 init_sec_ace(&nt_ace_list[num_aces++],
3422                                         &ace->trustee,
3423                                         nt_acl_type,
3424                                         acc,
3425                                         ace->ace_flags |
3426                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3427                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3428                                         SEC_ACE_FLAG_INHERIT_ONLY);
3429                         }
3430
3431                         /* The User must have access to a profile share - even
3432                          * if we can't map the SID. */
3433                         if (lp_profile_acls(SNUM(conn))) {
3434                                 add_or_replace_ace(nt_ace_list, &num_aces,
3435                                                 &global_sid_Builtin_Users,
3436                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3437                                                 FILE_GENERIC_ALL,
3438                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3439                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3440                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3441                         }
3442
3443                         /*
3444                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3445                          * Win2K needs this to get the inheritance correct when replacing ACLs
3446                          * on a directory tree. Based on work by Jim @ IBM.
3447                          */
3448
3449                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3450
3451                         if (lp_profile_acls(SNUM(conn))) {
3452                                 for (i = 0; i < num_aces; i++) {
3453                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3454                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3455                                                                    &orig_owner_sid,
3456                                                                    nt_ace_list[i].type,
3457                                                                    nt_ace_list[i].access_mask,
3458                                                                    nt_ace_list[i].flags);
3459                                                 break;
3460                                         }
3461                                 }
3462                         }
3463                 }
3464
3465                 if (num_aces) {
3466                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3467                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3468                                 goto done;
3469                         }
3470                 }
3471         } /* security_info & SECINFO_DACL */
3472
3473         psd = make_standard_sec_desc( talloc_tos(),
3474                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3475                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3476                         psa,
3477                         &sd_size);
3478
3479         if(!psd) {
3480                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3481                 sd_size = 0;
3482                 goto done;
3483         }
3484
3485         /*
3486          * Windows 2000: The DACL_PROTECTED flag in the security
3487          * descriptor marks the ACL as non-inheriting, i.e., no
3488          * ACEs from higher level directories propagate to this
3489          * ACL. In the POSIX ACL model permissions are only
3490          * inherited at file create time, so ACLs never contain
3491          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3492          * flag doesn't seem to bother Windows NT.
3493          * Always set this if map acl inherit is turned off.
3494          */
3495         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3496                 psd->type |= SEC_DESC_DACL_PROTECTED;
3497         } else {
3498                 psd->type |= pal->sd_type;
3499         }
3500
3501         if (psd->dacl) {
3502                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3503         }
3504
3505         *ppdesc = psd;
3506
3507  done:
3508
3509         if (posix_acl) {
3510                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3511         }
3512         if (def_acl) {
3513                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3514         }
3515         free_canon_ace_list(file_ace);
3516         free_canon_ace_list(dir_ace);
3517         free_inherited_info(pal);
3518         TALLOC_FREE(nt_ace_list);
3519
3520         return NT_STATUS_OK;
3521 }
3522
3523 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3524                            struct security_descriptor **ppdesc)
3525 {
3526         SMB_STRUCT_STAT sbuf;
3527         SMB_ACL_T posix_acl = NULL;
3528         struct pai_val *pal;
3529
3530         *ppdesc = NULL;
3531
3532         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3533                   fsp_str_dbg(fsp)));
3534
3535         /* can it happen that fsp_name == NULL ? */
3536         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3537                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3538                                         security_info, ppdesc);
3539         }
3540
3541         /* Get the stat struct for the owner info. */
3542         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3543                 return map_nt_error_from_unix(errno);
3544         }
3545
3546         /* Get the ACL from the fd. */
3547         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3548
3549         pal = fload_inherited_info(fsp);
3550
3551         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3552                                        &sbuf, pal, posix_acl, NULL,
3553                                        security_info, ppdesc);
3554 }
3555
3556 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3557                           uint32_t security_info, struct security_descriptor **ppdesc)
3558 {
3559         SMB_ACL_T posix_acl = NULL;
3560         SMB_ACL_T def_acl = NULL;
3561         struct pai_val *pal;
3562         struct smb_filename smb_fname;
3563         int ret;
3564
3565         *ppdesc = NULL;
3566
3567         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3568
3569         ZERO_STRUCT(smb_fname);
3570         smb_fname.base_name = discard_const_p(char, name);
3571
3572         /* Get the stat struct for the owner info. */
3573         if (lp_posix_pathnames()) {
3574                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3575         } else {
3576                 ret = SMB_VFS_STAT(conn, &smb_fname);
3577         }
3578
3579         if (ret == -1) {
3580                 return map_nt_error_from_unix(errno);
3581         }
3582
3583         /* Get the ACL from the path. */
3584         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3585
3586         /* If it's a directory get the default POSIX ACL. */
3587         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3588                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3589                 def_acl = free_empty_sys_acl(conn, def_acl);
3590         }
3591
3592         pal = load_inherited_info(conn, name);
3593
3594         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3595                                        posix_acl, def_acl, security_info,
3596                                        ppdesc);
3597 }
3598
3599 /****************************************************************************
3600  Try to chown a file. We will be able to chown it under the following conditions.
3601
3602   1) If we have root privileges, then it will just work.
3603   2) If we have SeRestorePrivilege we can change the user + group to any other user.
3604   3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3605   4) If we have write permission to the file and dos_filemodes is set
3606      then allow chown to the currently authenticated user.
3607 ****************************************************************************/
3608
3609 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3610 {
3611         NTSTATUS status;
3612
3613         if(!CAN_WRITE(fsp->conn)) {
3614                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3615         }
3616
3617         /* Case (1). */
3618         status = vfs_chown_fsp(fsp, uid, gid);
3619         if (NT_STATUS_IS_OK(status)) {
3620                 return status;
3621         }
3622
3623         /* Case (2) / (3) */
3624         if (lp_enable_privileges()) {
3625                 bool has_take_ownership_priv = security_token_has_privilege(
3626                                                 get_current_nttok(fsp->conn),
3627                                                 SEC_PRIV_TAKE_OWNERSHIP);
3628                 bool has_restore_priv = security_token_has_privilege(
3629                                                 get_current_nttok(fsp->conn),
3630                                                 SEC_PRIV_RESTORE);
3631
3632                 if (has_restore_priv) {
3633                         ; /* Case (2) */
3634                 } else if (has_take_ownership_priv) {
3635                         /* Case (3) */
3636                         if (uid == get_current_uid(fsp->conn)) {
3637                                 gid = (gid_t)-1;
3638                         } else {
3639                                 has_take_ownership_priv = false;
3640                         }
3641                 }
3642
3643                 if (has_take_ownership_priv || has_restore_priv) {
3644                         become_root();
3645                         status = vfs_chown_fsp(fsp, uid, gid);
3646                         unbecome_root();
3647                         return status;
3648                 }
3649         }
3650
3651         /* Case (4). */
3652         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3653                 return NT_STATUS_ACCESS_DENIED;
3654         }
3655
3656         /* only allow chown to the current user. This is more secure,
3657            and also copes with the case where the SID in a take ownership ACL is
3658            a local SID on the users workstation
3659         */
3660         if (uid != get_current_uid(fsp->conn)) {
3661                 return NT_STATUS_ACCESS_DENIED;
3662         }
3663
3664         become_root();
3665         /* Keep the current file gid the same. */
3666         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3667         unbecome_root();
3668
3669         return status;
3670 }
3671
3672 #if 0
3673 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3674
3675 /****************************************************************************
3676  Take care of parent ACL inheritance.
3677 ****************************************************************************/
3678
3679 NTSTATUS append_parent_acl(files_struct *fsp,
3680                                 const struct security_descriptor *pcsd,
3681                                 struct security_descriptor **pp_new_sd)
3682 {
3683         struct smb_filename *smb_dname = NULL;
3684         struct security_descriptor *parent_sd = NULL;
3685         files_struct *parent_fsp = NULL;
3686         TALLOC_CTX *mem_ctx = talloc_tos();
3687         char *parent_name = NULL;
3688         struct security_ace *new_ace = NULL;
3689         unsigned int num_aces = pcsd->dacl->num_aces;
3690         NTSTATUS status;
3691         int info;
3692         unsigned int i, j;
3693         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3694         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3695
3696         if (psd == NULL) {
3697                 return NT_STATUS_NO_MEMORY;
3698         }
3699
3700         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3701                             NULL)) {
3702                 return NT_STATUS_NO_MEMORY;
3703         }
3704
3705         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3706                                             &smb_dname);
3707         if (!NT_STATUS_IS_OK(status)) {
3708                 goto fail;
3709         }
3710
3711         status = SMB_VFS_CREATE_FILE(
3712                 fsp->conn,                              /* conn */
3713                 NULL,                                   /* req */
3714                 0,                                      /* root_dir_fid */
3715                 smb_dname,                              /* fname */
3716                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3717                 FILE_SHARE_NONE,                        /* share_access */
3718                 FILE_OPEN,                              /* create_disposition*/
3719                 FILE_DIRECTORY_FILE,                    /* create_options */
3720                 0,                                      /* file_attributes */
3721                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3722                 0,                                      /* allocation_size */
3723                 NULL,                                   /* sd */
3724                 NULL,                                   /* ea_list */
3725                 &parent_fsp,                            /* result */
3726                 &info);                                 /* pinfo */
3727
3728         if (!NT_STATUS_IS_OK(status)) {
3729                 TALLOC_FREE(smb_dname);
3730                 return status;
3731         }
3732
3733         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3734                                     SECINFO_DACL, &parent_sd );
3735
3736         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3737         TALLOC_FREE(smb_dname);
3738
3739         if (!NT_STATUS_IS_OK(status)) {
3740                 return status;
3741         }
3742
3743         /*
3744          * Make room for potentially all the ACLs from
3745          * the parent. We used to add the ugw triple here,
3746          * as we knew we were dealing with POSIX ACLs.
3747          * We no longer need to do so as we can guarentee
3748          * that a default ACL from the parent directory will
3749          * be well formed for POSIX ACLs if it came from a
3750          * POSIX ACL source, and if we're not writing to a
3751          * POSIX ACL sink then we don't care if it's not well
3752          * formed. JRA.
3753          */
3754
3755         num_aces += parent_sd->dacl->num_aces;
3756
3757         if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3758                                         num_aces)) == NULL) {
3759                 return NT_STATUS_NO_MEMORY;
3760         }
3761
3762         /* Start by copying in all the given ACE entries. */
3763         for (i = 0; i < psd->dacl->num_aces; i++) {
3764                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3765         }
3766
3767         /*
3768          * Note that we're ignoring "inherit permissions" here
3769          * as that really only applies to newly created files. JRA.
3770          */
3771
3772         /* Finally append any inherited ACEs. */
3773         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3774                 struct security_ace *se = &parent_sd->dacl->aces[j];
3775
3776                 if (fsp->is_directory) {
3777                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3778                                 /* Doesn't apply to a directory - ignore. */
3779                                 DEBUG(10,("append_parent_acl: directory %s "
3780                                         "ignoring non container "
3781                                         "inherit flags %u on ACE with sid %s "
3782                                         "from parent %s\n",
3783                                         fsp_str_dbg(fsp),
3784                                         (unsigned int)se->flags,
3785                                         sid_string_dbg(&se->trustee),
3786                                         parent_name));
3787                                 continue;
3788                         }
3789                 } else {
3790                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3791                                 /* Doesn't apply to a file - ignore. */
3792                                 DEBUG(10,("append_parent_acl: file %s "
3793                                         "ignoring non object "
3794                                         "inherit flags %u on ACE with sid %s "
3795                                         "from parent %s\n",
3796                                         fsp_str_dbg(fsp),
3797                                         (unsigned int)se->flags,
3798                                         sid_string_dbg(&se->trustee),
3799                                         parent_name));
3800                                 continue;
3801                         }
3802                 }
3803
3804                 if (is_dacl_protected) {
3805                         /* If the DACL is protected it means we must
3806                          * not overwrite an existing ACE entry with the
3807                          * same SID. This is order N^2. Ouch :-(. JRA. */
3808                         unsigned int k;
3809                         for (k = 0; k < psd->dacl->num_aces; k++) {
3810                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3811                                                 &se->trustee)) {
3812                                         break;
3813                                 }
3814                         }
3815                         if (k < psd->dacl->num_aces) {
3816                                 /* SID matched. Ignore. */
3817                                 DEBUG(10,("append_parent_acl: path %s "
3818                                         "ignoring ACE with protected sid %s "
3819                                         "from parent %s\n",
3820                                         fsp_str_dbg(fsp),
3821                                         sid_string_dbg(&se->trustee),
3822                                         parent_name));
3823                                 continue;
3824                         }
3825                 }
3826
3827                 sec_ace_copy(&new_ace[i], se);
3828                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3829                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3830                 }
3831                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3832
3833                 if (fsp->is_directory) {
3834                         /*
3835                          * Strip off any inherit only. It's applied.
3836                          */
3837                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3838                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3839                                 /* No further inheritance. */
3840                                 new_ace[i].flags &=
3841                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3842                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3843                         }
3844                 } else {
3845                         /*
3846                          * Strip off any container or inherit
3847                          * flags, they can't apply to objects.
3848                          */
3849                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3850                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3851                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3852                 }
3853                 i++;
3854
3855                 DEBUG(10,("append_parent_acl: path %s "
3856                         "inheriting ACE with sid %s "
3857                         "from parent %s\n",
3858                         fsp_str_dbg(fsp),
3859                         sid_string_dbg(&se->trustee),
3860                         parent_name));
3861         }
3862
3863         psd->dacl->aces = new_ace;
3864         psd->dacl->num_aces = i;
3865         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3866                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
3867
3868         *pp_new_sd = psd;
3869         return status;
3870 }
3871 #endif
3872
3873 /****************************************************************************
3874  Reply to set a security descriptor on an fsp. security_info_sent is the
3875  description of the following NT ACL.
3876  This should be the only external function needed for the UNIX style set ACL.
3877  We make a copy of psd_orig as internal functions modify the elements inside
3878  it, even though it's a const pointer.
3879 ****************************************************************************/
3880
3881 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3882 {
3883         connection_struct *conn = fsp->conn;
3884         uid_t user = (uid_t)-1;
3885         gid_t grp = (gid_t)-1;
3886         struct dom_sid file_owner_sid;
3887         struct dom_sid file_grp_sid;
3888         canon_ace *file_ace_list = NULL;
3889         canon_ace *dir_ace_list = NULL;
3890         bool acl_perms = False;
3891         mode_t orig_mode = (mode_t)0;
3892         NTSTATUS status;
3893         bool set_acl_as_root = false;
3894         bool acl_set_support = false;
3895         bool ret = false;
3896         struct security_descriptor *psd = NULL;
3897
3898         DEBUG(10,("set_nt_acl: called for file %s\n",
3899                   fsp_str_dbg(fsp)));
3900
3901         if (!CAN_WRITE(conn)) {
3902                 DEBUG(10,("set acl rejected on read-only share\n"));
3903                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3904         }
3905
3906         if (!psd_orig) {
3907                 return NT_STATUS_INVALID_PARAMETER;
3908         }
3909
3910         psd = dup_sec_desc(talloc_tos(), psd_orig);
3911         if (!psd) {
3912                 return NT_STATUS_NO_MEMORY;
3913         }
3914
3915         /*
3916          * Get the current state of the file.
3917          */
3918
3919         status = vfs_stat_fsp(fsp);
3920         if (!NT_STATUS_IS_OK(status)) {
3921                 return status;
3922         }
3923
3924         /* Save the original element we check against. */
3925         orig_mode = fsp->fsp_name->st.st_ex_mode;
3926
3927         /*
3928          * Unpack the user/group/world id's.
3929          */
3930
3931         /* POSIX can't cope with missing owner/group. */
3932         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3933                 security_info_sent &= ~SECINFO_OWNER;
3934         }
3935         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3936                 security_info_sent &= ~SECINFO_GROUP;
3937         }
3938
3939         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3940         if (!NT_STATUS_IS_OK(status)) {
3941                 return status;
3942         }
3943
3944         /*
3945          * Do we need to chown ? If so this must be done first as the incoming
3946          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3947          * Noticed by Simo.
3948          */
3949
3950         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3951             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3952
3953                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3954                          fsp_str_dbg(fsp), (unsigned int)user,
3955                          (unsigned int)grp));
3956
3957                 status = try_chown(fsp, user, grp);
3958                 if(!NT_STATUS_IS_OK(status)) {
3959                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3960                                 "= %s.\n", fsp_str_dbg(fsp),
3961                                 (unsigned int)user,
3962                                 (unsigned int)grp,
3963                                 nt_errstr(status)));
3964                         return status;
3965                 }
3966
3967                 /*
3968                  * Recheck the current state of the file, which may have changed.
3969                  * (suid/sgid bits, for instance)
3970                  */
3971
3972                 status = vfs_stat_fsp(fsp);
3973                 if (!NT_STATUS_IS_OK(status)) {
3974                         return status;
3975                 }
3976
3977                 /* Save the original element we check against. */
3978                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3979
3980                 /* If we successfully chowned, we know we must
3981                  * be able to set the acl, so do it as root.
3982                  */
3983                 set_acl_as_root = true;
3984         }
3985
3986         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3987
3988         if((security_info_sent & SECINFO_DACL) &&
3989                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3990                         (psd->dacl == NULL)) {
3991                 struct security_ace ace[3];
3992
3993                 /* We can't have NULL DACL in POSIX.
3994                    Use owner/group/Everyone -> full access. */
3995
3996                 init_sec_ace(&ace[0],
3997                                 &file_owner_sid,
3998                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3999                                 GENERIC_ALL_ACCESS,
4000                                 0);
4001                 init_sec_ace(&ace[1],
4002                                 &file_grp_sid,
4003                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4004                                 GENERIC_ALL_ACCESS,
4005                                 0);
4006                 init_sec_ace(&ace[2],
4007                                 &global_sid_World,
4008                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4009                                 GENERIC_ALL_ACCESS,
4010                                 0);
4011                 psd->dacl = make_sec_acl(talloc_tos(),
4012                                         NT4_ACL_REVISION,
4013                                         3,
4014                                         ace);
4015                 if (psd->dacl == NULL) {
4016                         return NT_STATUS_NO_MEMORY;
4017                 }
4018                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
4019         }
4020
4021         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
4022                                      &file_grp_sid, &file_ace_list,
4023                                      &dir_ace_list, security_info_sent, psd);
4024
4025         /* Ignore W2K traverse DACL set. */
4026         if (!file_ace_list && !dir_ace_list) {
4027                 return NT_STATUS_OK;
4028         }
4029
4030         if (!acl_perms) {
4031                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
4032                 free_canon_ace_list(file_ace_list);
4033                 free_canon_ace_list(dir_ace_list);
4034                 return NT_STATUS_ACCESS_DENIED;
4035         }
4036
4037         /*
4038          * Only change security if we got a DACL.
4039          */
4040
4041         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
4042                 free_canon_ace_list(file_ace_list);
4043                 free_canon_ace_list(dir_ace_list);
4044                 return NT_STATUS_OK;
4045         }
4046
4047         /*
4048          * Try using the POSIX ACL set first. Fall back to chmod if
4049          * we have no ACL support on this filesystem.
4050          */
4051
4052         if (acl_perms && file_ace_list) {
4053                 if (set_acl_as_root) {
4054                         become_root();
4055                 }
4056                 ret = set_canon_ace_list(fsp, file_ace_list, false,
4057                                          &fsp->fsp_name->st, &acl_set_support);
4058                 if (set_acl_as_root) {
4059                         unbecome_root();
4060                 }
4061                 if (acl_set_support && ret == false) {
4062                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
4063                                  "%s (%s).\n", fsp_str_dbg(fsp),
4064                                  strerror(errno)));
4065                         free_canon_ace_list(file_ace_list);
4066                         free_canon_ace_list(dir_ace_list);
4067                         return map_nt_error_from_unix(errno);
4068                 }
4069         }
4070
4071         if (acl_perms && acl_set_support && fsp->is_directory) {
4072                 if (dir_ace_list) {
4073                         if (set_acl_as_root) {
4074                                 become_root();
4075                         }
4076                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
4077                                                  &fsp->fsp_name->st,
4078                                                  &acl_set_support);
4079                         if (set_acl_as_root) {
4080                                 unbecome_root();
4081                         }
4082                         if (ret == false) {
4083                                 DEBUG(3,("set_nt_acl: failed to set default "
4084                                          "acl on directory %s (%s).\n",
4085                                          fsp_str_dbg(fsp), strerror(errno)));
4086                                 free_canon_ace_list(file_ace_list);
4087                                 free_canon_ace_list(dir_ace_list);
4088                                 return map_nt_error_from_unix(errno);
4089                         }
4090                 } else {
4091                         int sret = -1;
4092
4093                         /*
4094                          * No default ACL - delete one if it exists.
4095                          */
4096
4097                         if (set_acl_as_root) {
4098                                 become_root();
4099                         }
4100                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4101                             fsp->fsp_name->base_name);
4102                         if (set_acl_as_root) {
4103                                 unbecome_root();
4104                         }
4105                         if (sret == -1) {
4106                                 if (acl_group_override(conn, fsp->fsp_name)) {
4107                                         DEBUG(5,("set_nt_acl: acl group "
4108                                                  "control on and current user "
4109                                                  "in file %s primary group. "
4110                                                  "Override delete_def_acl\n",
4111                                                  fsp_str_dbg(fsp)));
4112
4113                                         become_root();
4114                                         sret =
4115                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4116                                                     conn,
4117                                                     fsp->fsp_name->base_name);
4118                                         unbecome_root();
4119                                 }
4120
4121                                 if (sret == -1) {
4122                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4123                                         free_canon_ace_list(file_ace_list);
4124                                         free_canon_ace_list(dir_ace_list);
4125                                         return map_nt_error_from_unix(errno);
4126                                 }
4127                         }
4128                 }
4129         }
4130
4131         if (acl_set_support) {
4132                 if (set_acl_as_root) {
4133                         become_root();
4134                 }
4135                 store_inheritance_attributes(fsp,
4136                                 file_ace_list,
4137                                 dir_ace_list,
4138                                 psd->type);
4139                 if (set_acl_as_root) {
4140                         unbecome_root();
4141                 }
4142         }
4143
4144         /*
4145          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4146          */
4147
4148         if(!acl_set_support && acl_perms) {
4149                 mode_t posix_perms;
4150
4151                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4152                         free_canon_ace_list(file_ace_list);
4153                         free_canon_ace_list(dir_ace_list);
4154                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4155                                  "posix permissions for file %s.\n",
4156                                  fsp_str_dbg(fsp)));
4157                         return NT_STATUS_ACCESS_DENIED;
4158                 }
4159
4160                 if (orig_mode != posix_perms) {
4161                         int sret = -1;
4162
4163                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4164                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4165
4166                         if (set_acl_as_root) {
4167                                 become_root();
4168                         }
4169                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4170                                              posix_perms);
4171                         if (set_acl_as_root) {
4172                                 unbecome_root();
4173                         }
4174                         if(sret == -1) {
4175                                 if (acl_group_override(conn, fsp->fsp_name)) {
4176                                         DEBUG(5,("set_nt_acl: acl group "
4177                                                  "control on and current user "
4178                                                  "in file %s primary group. "
4179                                                  "Override chmod\n",
4180                                                  fsp_str_dbg(fsp)));
4181
4182                                         become_root();
4183                                         sret = SMB_VFS_CHMOD(conn,
4184                                             fsp->fsp_name->base_name,
4185                                             posix_perms);
4186                                         unbecome_root();
4187                                 }
4188
4189                                 if (sret == -1) {
4190                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4191                                                  "failed. Error = %s.\n",
4192                                                  fsp_str_dbg(fsp),
4193                                                  (unsigned int)posix_perms,
4194                                                  strerror(errno)));
4195                                         free_canon_ace_list(file_ace_list);
4196                                         free_canon_ace_list(dir_ace_list);
4197                                         return map_nt_error_from_unix(errno);
4198                                 }
4199                         }
4200                 }
4201         }
4202
4203         free_canon_ace_list(file_ace_list);
4204         free_canon_ace_list(dir_ace_list);
4205
4206         /* Ensure the stat struct in the fsp is correct. */
4207         status = vfs_stat_fsp(fsp);
4208
4209         return NT_STATUS_OK;
4210 }
4211
4212 /****************************************************************************
4213  Get the actual group bits stored on a file with an ACL. Has no effect if
4214  the file has no ACL. Needed in dosmode code where the stat() will return
4215  the mask bits, not the real group bits, for a file with an ACL.
4216 ****************************************************************************/
4217
4218 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4219 {
4220         int entry_id = SMB_ACL_FIRST_ENTRY;
4221         SMB_ACL_ENTRY_T entry;
4222         SMB_ACL_T posix_acl;
4223         int result = -1;
4224
4225         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4226         if (posix_acl == (SMB_ACL_T)NULL)
4227                 return -1;
4228
4229         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4230                 SMB_ACL_TAG_T tagtype;
4231                 SMB_ACL_PERMSET_T permset;
4232
4233                 entry_id = SMB_ACL_NEXT_ENTRY;
4234
4235                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4236                         break;
4237
4238                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4239                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4240                                 break;
4241                         } else {
4242                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4243                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4244                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4245                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4246                                 result = 0;
4247                                 break;
4248                         }
4249                 }
4250         }
4251         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4252         return result;
4253 }
4254
4255 /****************************************************************************
4256  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4257  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4258 ****************************************************************************/
4259
4260 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4261 {
4262         int entry_id = SMB_ACL_FIRST_ENTRY;
4263         SMB_ACL_ENTRY_T entry;
4264         int num_entries = 0;
4265
4266         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4267                 SMB_ACL_TAG_T tagtype;
4268                 SMB_ACL_PERMSET_T permset;
4269                 mode_t perms;
4270
4271                 entry_id = SMB_ACL_NEXT_ENTRY;
4272
4273                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4274                         return -1;
4275
4276                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4277                         return -1;
4278
4279                 num_entries++;
4280
4281                 switch(tagtype) {
4282                         case SMB_ACL_USER_OBJ:
4283                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4284                                 break;
4285                         case SMB_ACL_GROUP_OBJ:
4286                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4287                                 break;
4288                         case SMB_ACL_MASK:
4289                                 /*
4290                                  * FIXME: The ACL_MASK entry permissions should really be set to
4291                                  * the union of the permissions of all ACL_USER,
4292                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4293                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4294                                  */
4295                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4296                                 break;
4297                         case SMB_ACL_OTHER:
4298                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4299                                 break;
4300                         default:
4301                                 continue;
4302                 }
4303
4304                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4305                         return -1;
4306
4307                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4308                         return -1;
4309         }
4310
4311         /*
4312          * If this is a simple 3 element ACL or no elements then it's a standard
4313          * UNIX permission set. Just use chmod...
4314          */
4315
4316         if ((num_entries == 3) || (num_entries == 0))
4317                 return -1;
4318
4319         return 0;
4320 }
4321
4322 /****************************************************************************
4323  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4324  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4325  resulting ACL on TO.  Note that name is in UNIX character set.
4326 ****************************************************************************/
4327
4328 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4329 {
4330         SMB_ACL_T posix_acl = NULL;
4331         int ret = -1;
4332
4333         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4334                 return -1;
4335
4336         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4337                 goto done;
4338
4339         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4340
4341  done:
4342
4343         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4344         return ret;
4345 }
4346
4347 /****************************************************************************
4348  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4349  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4350  Note that name is in UNIX character set.
4351 ****************************************************************************/
4352
4353 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4354 {
4355         return copy_access_posix_acl(conn, name, name, mode);
4356 }
4357
4358 /****************************************************************************
4359  Check for an existing default POSIX ACL on a directory.
4360 ****************************************************************************/
4361
4362 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4363 {
4364         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4365         bool has_acl = False;
4366         SMB_ACL_ENTRY_T entry;
4367
4368         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4369                 has_acl = True;
4370         }
4371
4372         if (def_acl) {
4373                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4374         }
4375         return has_acl;
4376 }
4377
4378 /****************************************************************************
4379  If the parent directory has no default ACL but it does have an Access ACL,
4380  inherit this Access ACL to file name.
4381 ****************************************************************************/
4382
4383 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4384                        const char *name, mode_t mode)
4385 {
4386         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4387                 return 0;
4388
4389         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4390 }
4391
4392 /****************************************************************************
4393  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4394  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4395 ****************************************************************************/
4396
4397 int fchmod_acl(files_struct *fsp, mode_t mode)
4398 {
4399         connection_struct *conn = fsp->conn;
4400         SMB_ACL_T posix_acl = NULL;
4401         int ret = -1;
4402
4403         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4404                 return -1;
4405
4406         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4407                 goto done;
4408
4409         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4410
4411   done:
4412
4413         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4414         return ret;
4415 }
4416
4417 /****************************************************************************
4418  Map from wire type to permset.
4419 ****************************************************************************/
4420
4421 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4422 {
4423         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4424                 return False;
4425         }
4426
4427         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4428                 return False;
4429         }
4430
4431         if (wire_perm & SMB_POSIX_ACL_READ) {
4432                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4433                         return False;
4434                 }
4435         }
4436         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4437                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4438                         return False;
4439                 }
4440         }
4441         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4442                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4443                         return False;
4444                 }
4445         }
4446         return True;
4447 }
4448
4449 /****************************************************************************
4450  Map from wire type to tagtype.
4451 ****************************************************************************/
4452
4453 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4454 {
4455         switch (wire_tt) {
4456                 case SMB_POSIX_ACL_USER_OBJ:
4457                         *p_tt = SMB_ACL_USER_OBJ;
4458                         break;
4459                 case SMB_POSIX_ACL_USER:
4460                         *p_tt = SMB_ACL_USER;
4461                         break;
4462                 case SMB_POSIX_ACL_GROUP_OBJ:
4463                         *p_tt = SMB_ACL_GROUP_OBJ;
4464                         break;
4465                 case SMB_POSIX_ACL_GROUP:
4466                         *p_tt = SMB_ACL_GROUP;
4467                         break;
4468                 case SMB_POSIX_ACL_MASK:
4469                         *p_tt = SMB_ACL_MASK;
4470                         break;
4471                 case SMB_POSIX_ACL_OTHER:
4472                         *p_tt = SMB_ACL_OTHER;
4473                         break;
4474                 default:
4475                         return False;
4476         }
4477         return True;
4478 }
4479
4480 /****************************************************************************
4481  Create a new POSIX acl from wire permissions.
4482  FIXME ! How does the share mask/mode fit into this.... ?
4483 ****************************************************************************/
4484
4485 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4486 {
4487         unsigned int i;
4488         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4489
4490         if (the_acl == NULL) {
4491                 return NULL;
4492         }
4493
4494         for (i = 0; i < num_acls; i++) {
4495                 SMB_ACL_ENTRY_T the_entry;
4496                 SMB_ACL_PERMSET_T the_permset;
4497                 SMB_ACL_TAG_T tag_type;
4498
4499                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4500                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4501                                 i, strerror(errno) ));
4502                         goto fail;
4503                 }
4504
4505                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4506                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4507                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4508                         goto fail;
4509                 }
4510
4511                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4512                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4513                                 i, strerror(errno) ));
4514                         goto fail;
4515                 }
4516
4517                 /* Get the permset pointer from the new ACL entry. */
4518                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4519                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4520                                 i, strerror(errno) ));
4521                         goto fail;
4522                 }
4523
4524                 /* Map from wire to permissions. */
4525                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4526                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4527                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4528                         goto fail;
4529                 }
4530
4531                 /* Now apply to the new ACL entry. */
4532                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4533                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4534                                 i, strerror(errno) ));
4535                         goto fail;
4536                 }
4537
4538                 if (tag_type == SMB_ACL_USER) {
4539                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4540                         uid_t uid = (uid_t)uidval;
4541                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4542                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4543                                         (unsigned int)uid, i, strerror(errno) ));
4544                                 goto fail;
4545                         }
4546                 }
4547
4548                 if (tag_type == SMB_ACL_GROUP) {
4549                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4550                         gid_t gid = (uid_t)gidval;
4551                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4552                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4553                                         (unsigned int)gid, i, strerror(errno) ));
4554                                 goto fail;
4555                         }
4556                 }
4557         }
4558
4559         return the_acl;
4560
4561  fail:
4562
4563         if (the_acl != NULL) {
4564                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4565         }
4566         return NULL;
4567 }
4568
4569 /****************************************************************************
4570  Calls from UNIX extensions - Default POSIX ACL set.
4571  If num_def_acls == 0 and not a directory just return. If it is a directory
4572  and num_def_acls == 0 then remove the default acl. Else set the default acl
4573  on the directory.
4574 ****************************************************************************/
4575
4576 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4577                                 uint16 num_def_acls, const char *pdata)
4578 {
4579         SMB_ACL_T def_acl = NULL;
4580
4581         if (!S_ISDIR(psbuf->st_ex_mode)) {
4582                 if (num_def_acls) {
4583                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4584                         errno = EISDIR;
4585                         return False;
4586                 } else {
4587                         return True;
4588                 }
4589         }
4590
4591         if (!num_def_acls) {
4592                 /* Remove the default ACL. */
4593                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4594                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4595                                 fname, strerror(errno) ));
4596                         return False;
4597                 }
4598                 return True;
4599         }
4600
4601         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4602                 return False;
4603         }
4604
4605         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4606                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4607                         fname, strerror(errno) ));
4608                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4609                 return False;
4610         }
4611
4612         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4613         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4614         return True;
4615 }
4616
4617 /****************************************************************************
4618  Remove an ACL from a file. As we don't have acl_delete_entry() available
4619  we must read the current acl and copy all entries except MASK, USER and GROUP
4620  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4621  removed.
4622  FIXME ! How does the share mask/mode fit into this.... ?
4623 ****************************************************************************/
4624
4625 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4626 {
4627         SMB_ACL_T file_acl = NULL;
4628         int entry_id = SMB_ACL_FIRST_ENTRY;
4629         SMB_ACL_ENTRY_T entry;
4630         bool ret = False;
4631         /* Create a new ACL with only 3 entries, u/g/w. */
4632         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4633         SMB_ACL_ENTRY_T user_ent = NULL;
4634         SMB_ACL_ENTRY_T group_ent = NULL;
4635         SMB_ACL_ENTRY_T other_ent = NULL;
4636
4637         if (new_file_acl == NULL) {
4638                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4639                 return False;
4640         }
4641
4642         /* Now create the u/g/w entries. */
4643         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4644                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4645                         fname, strerror(errno) ));
4646                 goto done;
4647         }
4648         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4649                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4650                         fname, strerror(errno) ));
4651                 goto done;
4652         }
4653
4654         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4655                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4656                         fname, strerror(errno) ));
4657                 goto done;
4658         }
4659         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4660                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4661                         fname, strerror(errno) ));
4662                 goto done;
4663         }
4664
4665         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4666                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4667                         fname, strerror(errno) ));
4668                 goto done;
4669         }
4670         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4671                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4672                         fname, strerror(errno) ));
4673                 goto done;
4674         }
4675
4676         /* Get the current file ACL. */
4677         if (fsp && fsp->fh->fd != -1) {
4678                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4679         } else {
4680                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4681         }
4682
4683         if (file_acl == NULL) {
4684                 /* This is only returned if an error occurred. Even for a file with
4685                    no acl a u/g/w acl should be returned. */
4686                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4687                         fname, strerror(errno) ));
4688                 goto done;
4689         }
4690
4691         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4692                 SMB_ACL_TAG_T tagtype;
4693                 SMB_ACL_PERMSET_T permset;
4694
4695                 entry_id = SMB_ACL_NEXT_ENTRY;
4696
4697                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4698                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4699                                 fname, strerror(errno) ));
4700                         goto done;
4701                 }
4702
4703                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4704                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4705                                 fname, strerror(errno) ));
4706                         goto done;
4707                 }
4708
4709                 if (tagtype == SMB_ACL_USER_OBJ) {
4710                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4711                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4712                                         fname, strerror(errno) ));
4713                         }
4714                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4715                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4716                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4717                                         fname, strerror(errno) ));
4718                         }
4719                 } else if (tagtype == SMB_ACL_OTHER) {
4720                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4721                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4722                                         fname, strerror(errno) ));
4723                         }
4724                 }
4725         }
4726
4727         /* Set the new empty file ACL. */
4728         if (fsp && fsp->fh->fd != -1) {
4729                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4730                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4731                                 fname, strerror(errno) ));
4732                         goto done;
4733                 }
4734         } else {
4735                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4736                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4737                                 fname, strerror(errno) ));
4738                         goto done;
4739                 }
4740         }
4741
4742         ret = True;
4743
4744  done:
4745
4746         if (file_acl) {
4747                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4748         }
4749         if (new_file_acl) {
4750                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4751         }
4752         return ret;
4753 }
4754
4755 /****************************************************************************
4756  Calls from UNIX extensions - POSIX ACL set.
4757  If num_def_acls == 0 then read/modify/write acl after removing all entries
4758  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4759 ****************************************************************************/
4760
4761 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4762 {
4763         SMB_ACL_T file_acl = NULL;
4764
4765         if (!num_acls) {
4766                 /* Remove the ACL from the file. */
4767                 return remove_posix_acl(conn, fsp, fname);
4768         }
4769
4770         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4771                 return False;
4772         }
4773
4774         if (fsp && fsp->fh->fd != -1) {
4775                 /* The preferred way - use an open fd. */
4776                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4777                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4778                                 fname, strerror(errno) ));
4779                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4780                         return False;
4781                 }
4782         } else {
4783                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4784                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4785                                 fname, strerror(errno) ));
4786                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4787                         return False;
4788                 }
4789         }
4790
4791         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4792         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4793         return True;
4794 }
4795
4796 /********************************************************************
4797  Pull the NT ACL from a file on disk or the OpenEventlog() access
4798  check.  Caller is responsible for freeing the returned security
4799  descriptor via TALLOC_FREE().  This is designed for dealing with
4800  user space access checks in smbd outside of the VFS.  For example,
4801  checking access rights in OpenEventlog().
4802
4803  Assume we are dealing with files (for now)
4804 ********************************************************************/
4805
4806 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4807 {
4808         struct security_descriptor *psd, *ret_sd;
4809         connection_struct *conn;
4810         files_struct finfo;
4811         struct fd_handle fh;
4812         NTSTATUS status;
4813
4814         conn = talloc_zero(ctx, connection_struct);
4815         if (conn == NULL) {
4816                 DEBUG(0, ("talloc failed\n"));
4817                 return NULL;
4818         }
4819
4820         if (!(conn->params = talloc(conn, struct share_params))) {
4821                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4822                 TALLOC_FREE(conn);
4823                 return NULL;
4824         }
4825
4826         conn->params->service = -1;
4827
4828         set_conn_connectpath(conn, "/");
4829
4830         if (!smbd_vfs_init(conn)) {
4831                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4832                 conn_free(conn);
4833                 return NULL;
4834         }
4835
4836         ZERO_STRUCT( finfo );
4837         ZERO_STRUCT( fh );
4838
4839         finfo.fnum = -1;
4840         finfo.conn = conn;
4841         finfo.fh = &fh;
4842         finfo.fh->fd = -1;
4843
4844         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4845                                             &finfo.fsp_name);
4846         if (!NT_STATUS_IS_OK(status)) {
4847                 conn_free(conn);
4848                 return NULL;
4849         }
4850
4851         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4852                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4853                 TALLOC_FREE(finfo.fsp_name);
4854                 conn_free(conn);
4855                 return NULL;
4856         }
4857
4858         ret_sd = dup_sec_desc( ctx, psd );
4859
4860         TALLOC_FREE(finfo.fsp_name);
4861         conn_free(conn);
4862
4863         return ret_sd;
4864 }
4865
4866 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4867
4868 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4869                                         const char *name,
4870                                         SMB_STRUCT_STAT *psbuf,
4871                                         struct security_descriptor **ppdesc)
4872 {
4873         struct dom_sid owner_sid, group_sid;
4874         size_t size = 0;
4875         struct security_ace aces[4];
4876         uint32_t access_mask = 0;
4877         mode_t mode = psbuf->st_ex_mode;
4878         struct security_acl *new_dacl = NULL;
4879         int idx = 0;
4880
4881         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4882                 name, (int)mode ));
4883
4884         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4885         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4886
4887         /*
4888          We provide up to 4 ACEs
4889                 - Owner
4890                 - Group
4891                 - Everyone
4892                 - NT System
4893         */
4894
4895         if (mode & S_IRUSR) {
4896                 if (mode & S_IWUSR) {
4897                         access_mask |= SEC_RIGHTS_FILE_ALL;
4898                 } else {
4899                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4900                 }
4901         }
4902         if (mode & S_IWUSR) {
4903                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4904         }
4905
4906         init_sec_ace(&aces[idx],
4907                         &owner_sid,
4908                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4909                         access_mask,
4910                         0);
4911         idx++;
4912
4913         access_mask = 0;
4914         if (mode & S_IRGRP) {
4915                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4916         }
4917         if (mode & S_IWGRP) {
4918                 /* note that delete is not granted - this matches posix behaviour */
4919                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4920         }
4921         if (access_mask) {
4922                 init_sec_ace(&aces[idx],
4923                         &group_sid,
4924                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4925                         access_mask,
4926                         0);
4927                 idx++;
4928         }
4929
4930         access_mask = 0;
4931         if (mode & S_IROTH) {
4932                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4933         }
4934         if (mode & S_IWOTH) {
4935                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4936         }
4937         if (access_mask) {
4938                 init_sec_ace(&aces[idx],
4939                         &global_sid_World,
4940                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4941                         access_mask,
4942                         0);
4943                 idx++;
4944         }
4945
4946         init_sec_ace(&aces[idx],
4947                         &global_sid_System,
4948                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4949                         SEC_RIGHTS_FILE_ALL,
4950                         0);
4951         idx++;
4952
4953         new_dacl = make_sec_acl(ctx,
4954                         NT4_ACL_REVISION,
4955                         idx,
4956                         aces);
4957
4958         if (!new_dacl) {
4959                 return NT_STATUS_NO_MEMORY;
4960         }
4961
4962         *ppdesc = make_sec_desc(ctx,
4963                         SECURITY_DESCRIPTOR_REVISION_1,
4964                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4965                         &owner_sid,
4966                         &group_sid,
4967                         NULL,
4968                         new_dacl,
4969                         &size);
4970         if (!*ppdesc) {
4971                 return NT_STATUS_NO_MEMORY;
4972         }
4973         return NT_STATUS_OK;
4974 }