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                         } else if ((pace->type == SMB_ACL_GROUP)
1529                                    && (dom_sid_equal(&pace->trustee, &pace_user->trustee))) {
1530                                 /* If the SID owning the file appears
1531                                  * in a group entry, then we have
1532                                  * enough duplication, they will still
1533                                  * have access */
1534                                 got_duplicate_user = true;
1535                         }
1536                 }
1537
1538                 /* If the SID is equal for the user and group that we need
1539                    to add the duplicate for, add only the group */
1540                 if (!got_duplicate_user && !got_duplicate_group
1541                                 && dom_sid_equal(&pace_group->trustee,
1542                                                 &pace_user->trustee)) {
1543                         /* Add a duplicate SMB_ACL_GROUP entry, this
1544                          * will cover the owning SID as well, as it
1545                          * will always be mapped to both a uid and
1546                          * gid. */
1547
1548                         if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1549                                 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1550                                 return false;
1551                         }
1552
1553                         ZERO_STRUCTP(pace);
1554                         pace->type = SMB_ACL_GROUP;;
1555                         pace->owner_type = GID_ACE;
1556                         pace->unix_ug.gid = pace_group->unix_ug.gid;
1557                         pace->trustee = pace_group->trustee;
1558                         pace->attr = pace_group->attr;
1559                         pace->perms = pace_group->perms;
1560
1561                         DLIST_ADD(*pp_ace, pace);
1562
1563                         /* We're done here, make sure the
1564                            statements below are not executed. */
1565                         got_duplicate_user = true;
1566                         got_duplicate_group = true;
1567                 }
1568
1569                 if (!got_duplicate_user) {
1570                         /* Add a duplicate SMB_ACL_USER entry. */
1571                         if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1572                                 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1573                                 return false;
1574                         }
1575
1576                         ZERO_STRUCTP(pace);
1577                         pace->type = SMB_ACL_USER;;
1578                         pace->owner_type = UID_ACE;
1579                         pace->unix_ug.uid = pace_user->unix_ug.uid;
1580                         pace->trustee = pace_user->trustee;
1581                         pace->attr = pace_user->attr;
1582                         pace->perms = pace_user->perms;
1583
1584                         DLIST_ADD(*pp_ace, pace);
1585
1586                         got_duplicate_user = true;
1587                 }
1588
1589                 if (!got_duplicate_group) {
1590                         /* Add a duplicate SMB_ACL_GROUP entry. */
1591                         if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1592                                 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1593                                 return false;
1594                         }
1595
1596                         ZERO_STRUCTP(pace);
1597                         pace->type = SMB_ACL_GROUP;;
1598                         pace->owner_type = GID_ACE;
1599                         pace->unix_ug.gid = pace_group->unix_ug.gid;
1600                         pace->trustee = pace_group->trustee;
1601                         pace->attr = pace_group->attr;
1602                         pace->perms = pace_group->perms;
1603
1604                         DLIST_ADD(*pp_ace, pace);
1605
1606                         got_duplicate_group = true;
1607                 }
1608
1609         }
1610
1611         return True;
1612 }
1613
1614 /****************************************************************************
1615  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1616  If it does not have them, check if there are any entries where the trustee is the
1617  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1618  Note we must not do this to default directory ACLs.
1619 ****************************************************************************/
1620
1621 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1622 {
1623         bool got_user_obj, got_group_obj;
1624         canon_ace *current_ace;
1625         int i, entries;
1626
1627         entries = count_canon_ace_list(ace);
1628         got_user_obj = False;
1629         got_group_obj = False;
1630
1631         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1632                 if (current_ace->type == SMB_ACL_USER_OBJ)
1633                         got_user_obj = True;
1634                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1635                         got_group_obj = True;
1636         }
1637         if (got_user_obj && got_group_obj) {
1638                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1639                 return;
1640         }
1641
1642         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1643                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1644                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1645                         current_ace->type = SMB_ACL_USER_OBJ;
1646                         got_user_obj = True;
1647                 }
1648                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1649                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1650                         current_ace->type = SMB_ACL_GROUP_OBJ;
1651                         got_group_obj = True;
1652                 }
1653         }
1654         if (!got_user_obj)
1655                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1656         if (!got_group_obj)
1657                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1658 }
1659
1660 static bool add_current_ace_to_acl(files_struct *fsp, struct security_ace *psa,
1661                                    canon_ace **file_ace, canon_ace **dir_ace,
1662                                    bool *got_file_allow, bool *got_dir_allow,
1663                                    bool *all_aces_are_inherit_only,
1664                                    canon_ace *current_ace)
1665 {
1666
1667         /*
1668          * Map the given NT permissions into a UNIX mode_t containing only
1669          * S_I(R|W|X)USR bits.
1670          */
1671
1672         current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1673         current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1674
1675         /* Store the ace_flag. */
1676         current_ace->ace_flags = psa->flags;
1677
1678         /*
1679          * Now add the created ace to either the file list, the directory
1680          * list, or both. We *MUST* preserve the order here (hence we use
1681          * DLIST_ADD_END) as NT ACLs are order dependent.
1682          */
1683
1684         if (fsp->is_directory) {
1685
1686                 /*
1687                  * We can only add to the default POSIX ACE list if the ACE is
1688                  * designed to be inherited by both files and directories.
1689                  */
1690
1691                 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1692                     (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1693
1694                         canon_ace *current_dir_ace = current_ace;
1695                         DLIST_ADD_END(*dir_ace, current_ace, canon_ace *);
1696
1697                         /*
1698                          * Note if this was an allow ace. We can't process
1699                          * any further deny ace's after this.
1700                          */
1701
1702                         if (current_ace->attr == ALLOW_ACE)
1703                                 *got_dir_allow = True;
1704
1705                         if ((current_ace->attr == DENY_ACE) && *got_dir_allow) {
1706                                 DEBUG(0,("add_current_ace_to_acl: "
1707                                          "malformed ACL in "
1708                                          "inheritable ACL! Deny entry "
1709                                          "after Allow entry. Failing "
1710                                          "to set on file %s.\n",
1711                                          fsp_str_dbg(fsp)));
1712                                 return False;
1713                         }
1714
1715                         if( DEBUGLVL( 10 )) {
1716                                 dbgtext("add_current_ace_to_acl: adding dir ACL:\n");
1717                                 print_canon_ace( current_ace, 0);
1718                         }
1719
1720                         /*
1721                          * If this is not an inherit only ACE we need to add a duplicate
1722                          * to the file acl.
1723                          */
1724
1725                         if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1726                                 canon_ace *dup_ace = dup_canon_ace(current_ace);
1727
1728                                 if (!dup_ace) {
1729                                         DEBUG(0,("add_current_ace_to_acl: malloc fail !\n"));
1730                                         return False;
1731                                 }
1732
1733                                 /*
1734                                  * We must not free current_ace here as its
1735                                  * pointer is now owned by the dir_ace list.
1736                                  */
1737                                 current_ace = dup_ace;
1738                                 /* We've essentially split this ace into two,
1739                                  * and added the ace with inheritance request
1740                                  * bits to the directory ACL. Drop those bits for
1741                                  * the ACE we're adding to the file list. */
1742                                 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1743                                                             SEC_ACE_FLAG_CONTAINER_INHERIT|
1744                                                             SEC_ACE_FLAG_INHERIT_ONLY);
1745                         } else {
1746                                 /*
1747                                  * We must not free current_ace here as its
1748                                  * pointer is now owned by the dir_ace list.
1749                                  */
1750                                 current_ace = NULL;
1751                         }
1752
1753                         /*
1754                          * current_ace is now either owned by file_ace
1755                          * or is NULL. We can safely operate on current_dir_ace
1756                          * to treat mapping for default acl entries differently
1757                          * than access acl entries.
1758                          */
1759
1760                         if (current_dir_ace->owner_type == UID_ACE) {
1761                                 /*
1762                                  * We already decided above this is a uid,
1763                                  * for default acls ace's only CREATOR_OWNER
1764                                  * maps to ACL_USER_OBJ. All other uid
1765                                  * ace's are ACL_USER.
1766                                  */
1767                                 if (dom_sid_equal(&current_dir_ace->trustee,
1768                                                   &global_sid_Creator_Owner)) {
1769                                         current_dir_ace->type = SMB_ACL_USER_OBJ;
1770                                 } else {
1771                                         current_dir_ace->type = SMB_ACL_USER;
1772                                 }
1773                         }
1774
1775                         if (current_dir_ace->owner_type == GID_ACE) {
1776                                 /*
1777                                  * We already decided above this is a gid,
1778                                  * for default acls ace's only CREATOR_GROUP
1779                                  * maps to ACL_GROUP_OBJ. All other uid
1780                                  * ace's are ACL_GROUP.
1781                                  */
1782                                 if (dom_sid_equal(&current_dir_ace->trustee,
1783                                                   &global_sid_Creator_Group)) {
1784                                         current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1785                                 } else {
1786                                         current_dir_ace->type = SMB_ACL_GROUP;
1787                                 }
1788                         }
1789                 }
1790         }
1791
1792         /*
1793          * Only add to the file ACL if not inherit only.
1794          */
1795
1796         if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1797                 DLIST_ADD_END(*file_ace, current_ace, canon_ace *);
1798
1799                 /*
1800                  * Note if this was an allow ace. We can't process
1801                  * any further deny ace's after this.
1802                  */
1803
1804                 if (current_ace->attr == ALLOW_ACE)
1805                         *got_file_allow = True;
1806
1807                 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1808                         DEBUG(0,("add_current_ace_to_acl: malformed "
1809                                  "ACL in file ACL ! Deny entry after "
1810                                  "Allow entry. Failing to set on file "
1811                                  "%s.\n", fsp_str_dbg(fsp)));
1812                         return False;
1813                 }
1814
1815                 if( DEBUGLVL( 10 )) {
1816                         dbgtext("add_current_ace_to_acl: adding file ACL:\n");
1817                         print_canon_ace( current_ace, 0);
1818                 }
1819                 *all_aces_are_inherit_only = False;
1820                 /*
1821                  * We must not free current_ace here as its
1822                  * pointer is now owned by the file_ace list.
1823                  */
1824                 current_ace = NULL;
1825         }
1826
1827         /*
1828          * Free if ACE was not added.
1829          */
1830
1831         TALLOC_FREE(current_ace);
1832         return true;
1833 }
1834
1835 /****************************************************************************
1836  Unpack a struct security_descriptor into two canonical ace lists.
1837 ****************************************************************************/
1838
1839 static bool create_canon_ace_lists(files_struct *fsp,
1840                                         const SMB_STRUCT_STAT *pst,
1841                                         struct dom_sid *pfile_owner_sid,
1842                                         struct dom_sid *pfile_grp_sid,
1843                                         canon_ace **ppfile_ace,
1844                                         canon_ace **ppdir_ace,
1845                                         const struct security_acl *dacl)
1846 {
1847         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1848         canon_ace *file_ace = NULL;
1849         canon_ace *dir_ace = NULL;
1850         canon_ace *current_ace = NULL;
1851         bool got_dir_allow = False;
1852         bool got_file_allow = False;
1853         int i, j;
1854
1855         *ppfile_ace = NULL;
1856         *ppdir_ace = NULL;
1857
1858         /*
1859          * Convert the incoming ACL into a more regular form.
1860          */
1861
1862         for(i = 0; i < dacl->num_aces; i++) {
1863                 struct security_ace *psa = &dacl->aces[i];
1864
1865                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1866                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1867                         return False;
1868                 }
1869
1870                 if (nt4_compatible_acls()) {
1871                         /*
1872                          * The security mask may be UNIX_ACCESS_NONE which should map into
1873                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1874                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1875                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1876                          */
1877
1878                         /*
1879                          * Convert GENERIC bits to specific bits.
1880                          */
1881
1882                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1883
1884                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1885
1886                         if(psa->access_mask != UNIX_ACCESS_NONE)
1887                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1888                 }
1889         }
1890
1891         /*
1892          * Deal with the fact that NT 4.x re-writes the canonical format
1893          * that we return for default ACLs. If a directory ACE is identical
1894          * to a inherited directory ACE then NT changes the bits so that the
1895          * first ACE is set to OI|IO and the second ACE for this SID is set
1896          * to CI. We need to repair this. JRA.
1897          */
1898
1899         for(i = 0; i < dacl->num_aces; i++) {
1900                 struct security_ace *psa1 = &dacl->aces[i];
1901
1902                 for (j = i + 1; j < dacl->num_aces; j++) {
1903                         struct security_ace *psa2 = &dacl->aces[j];
1904
1905                         if (psa1->access_mask != psa2->access_mask)
1906                                 continue;
1907
1908                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1909                                 continue;
1910
1911                         /*
1912                          * Ok - permission bits and SIDs are equal.
1913                          * Check if flags were re-written.
1914                          */
1915
1916                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1917
1918                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1919                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1920
1921                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1922
1923                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1924                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1925
1926                         }
1927                 }
1928         }
1929
1930         for(i = 0; i < dacl->num_aces; i++) {
1931                 struct security_ace *psa = &dacl->aces[i];
1932
1933                 /*
1934                  * Create a canon_ace entry representing this NT DACL ACE.
1935                  */
1936
1937                 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1938                         free_canon_ace_list(file_ace);
1939                         free_canon_ace_list(dir_ace);
1940                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1941                         return False;
1942                 }
1943
1944                 ZERO_STRUCTP(current_ace);
1945
1946                 sid_copy(&current_ace->trustee, &psa->trustee);
1947
1948                 /*
1949                  * Try and work out if the SID is a user or group
1950                  * as we need to flag these differently for POSIX.
1951                  * Note what kind of a POSIX ACL this should map to.
1952                  */
1953
1954                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1955                         current_ace->owner_type = WORLD_ACE;
1956                         current_ace->unix_ug.world = -1;
1957                         current_ace->type = SMB_ACL_OTHER;
1958                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1959                         current_ace->owner_type = UID_ACE;
1960                         current_ace->unix_ug.uid = pst->st_ex_uid;
1961                         current_ace->type = SMB_ACL_USER_OBJ;
1962
1963                         /*
1964                          * The Creator Owner entry only specifies inheritable permissions,
1965                          * never access permissions. WinNT doesn't always set the ACE to
1966                          * INHERIT_ONLY, though.
1967                          */
1968
1969                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1970
1971                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1972                         current_ace->owner_type = GID_ACE;
1973                         current_ace->unix_ug.gid = pst->st_ex_gid;
1974                         current_ace->type = SMB_ACL_GROUP_OBJ;
1975
1976                         /*
1977                          * The Creator Group entry only specifies inheritable permissions,
1978                          * never access permissions. WinNT doesn't always set the ACE to
1979                          * INHERIT_ONLY, though.
1980                          */
1981                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1982
1983                 } else {
1984                         struct unixid unixid;
1985
1986                         if (!sids_to_unixids(&current_ace->trustee, 1, &unixid)) {
1987                                 free_canon_ace_list(file_ace);
1988                                 free_canon_ace_list(dir_ace);
1989                                 TALLOC_FREE(current_ace);
1990                                 DEBUG(0, ("create_canon_ace_lists: sids_to_unixids "
1991                                         "failed for %s (allocation failure)\n",
1992                                         sid_string_dbg(&current_ace->trustee)));
1993                                 return false;
1994                         }
1995
1996                         if (unixid.type == ID_TYPE_BOTH) {
1997                                 /* If it's the owning user, this is a
1998                                  * user_obj, not a user.  This way, we
1999                                  * get a valid ACL for groups that own
2000                                  * files, without putting user ACL
2001                                  * entries in for groups otherwise */
2002                                 if (unixid.id == pst->st_ex_uid) {
2003                                         current_ace->owner_type = UID_ACE;
2004                                         current_ace->unix_ug.uid = unixid.id;
2005                                         current_ace->type = SMB_ACL_USER_OBJ;
2006
2007                                         /* Add the user object to the posix ACL,
2008                                            and proceed to the group mapping
2009                                            below. This handles the talloc_free
2010                                            of current_ace if not added for some
2011                                            reason */
2012                                         if (!add_current_ace_to_acl(fsp,
2013                                                         psa,
2014                                                         &file_ace,
2015                                                         &dir_ace,
2016                                                         &got_file_allow,
2017                                                         &got_dir_allow,
2018                                                         &all_aces_are_inherit_only,
2019                                                         current_ace)) {
2020                                                 free_canon_ace_list(file_ace);
2021                                                 free_canon_ace_list(dir_ace);
2022                                                 return false;
2023                                         }
2024
2025                                         if ((current_ace = talloc(talloc_tos(),
2026                                                         canon_ace)) == NULL) {
2027                                                 free_canon_ace_list(file_ace);
2028                                                 free_canon_ace_list(dir_ace);
2029                                                 DEBUG(0,("create_canon_ace_lists: "
2030                                                         "malloc fail.\n"));
2031                                                 return False;
2032                                         }
2033
2034                                         ZERO_STRUCTP(current_ace);
2035                                 }
2036
2037                                 sid_copy(&current_ace->trustee, &psa->trustee);
2038
2039                                 current_ace->unix_ug.gid = unixid.id;
2040                                 current_ace->owner_type = GID_ACE;
2041                                 /* If it's the primary group, this is a
2042                                    group_obj, not a group. */
2043                                 if (current_ace->unix_ug.gid == pst->st_ex_gid) {
2044                                         current_ace->type = SMB_ACL_GROUP_OBJ;
2045                                 } else {
2046                                         current_ace->type = SMB_ACL_GROUP;
2047                                 }
2048
2049                         } else if (unixid.type == ID_TYPE_UID) {
2050                                 current_ace->owner_type = UID_ACE;
2051                                 current_ace->unix_ug.uid = unixid.id;
2052                                 /* If it's the owning user, this is a user_obj,
2053                                    not a user. */
2054                                 if (current_ace->unix_ug.uid == pst->st_ex_uid) {
2055                                         current_ace->type = SMB_ACL_USER_OBJ;
2056                                 } else {
2057                                         current_ace->type = SMB_ACL_USER;
2058                                 }
2059                         } else if (unixid.type == ID_TYPE_GID) {
2060                                 current_ace->unix_ug.gid = unixid.id;
2061                                 current_ace->owner_type = GID_ACE;
2062                                 /* If it's the primary group, this is a
2063                                    group_obj, not a group. */
2064                                 if (current_ace->unix_ug.gid == pst->st_ex_gid) {
2065                                         current_ace->type = SMB_ACL_GROUP_OBJ;
2066                                 } else {
2067                                         current_ace->type = SMB_ACL_GROUP;
2068                                 }
2069                         } else {
2070                                 /*
2071                                  * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
2072                                  */
2073
2074                                 if (non_mappable_sid(&psa->trustee)) {
2075                                         DEBUG(10, ("create_canon_ace_lists: ignoring "
2076                                                    "non-mappable SID %s\n",
2077                                                    sid_string_dbg(&psa->trustee)));
2078                                         TALLOC_FREE(current_ace);
2079                                         continue;
2080                                 }
2081
2082                                 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
2083                                         DEBUG(10, ("create_canon_ace_lists: ignoring "
2084                                                 "unknown or foreign SID %s\n",
2085                                                 sid_string_dbg(&psa->trustee)));
2086                                         TALLOC_FREE(current_ace);
2087                                         continue;
2088                                 }
2089
2090                                 free_canon_ace_list(file_ace);
2091                                 free_canon_ace_list(dir_ace);
2092                                 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
2093                                           "%s to uid or gid.\n",
2094                                           sid_string_dbg(&current_ace->trustee)));
2095                                 TALLOC_FREE(current_ace);
2096                                 return false;
2097                         }
2098                 }
2099
2100                 /* handles the talloc_free of current_ace if not added for some reason */
2101                 if (!add_current_ace_to_acl(fsp, psa, &file_ace, &dir_ace,
2102                                             &got_file_allow, &got_dir_allow,
2103                                             &all_aces_are_inherit_only, current_ace)) {
2104                         free_canon_ace_list(file_ace);
2105                         free_canon_ace_list(dir_ace);
2106                         return false;
2107                 }
2108         }
2109
2110         if (fsp->is_directory && all_aces_are_inherit_only) {
2111                 /*
2112                  * Windows 2000 is doing one of these weird 'inherit acl'
2113                  * traverses to conserve NTFS ACL resources. Just pretend
2114                  * there was no DACL sent. JRA.
2115                  */
2116
2117                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
2118                 free_canon_ace_list(file_ace);
2119                 free_canon_ace_list(dir_ace);
2120                 file_ace = NULL;
2121                 dir_ace = NULL;
2122         } else {
2123                 /*
2124                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
2125                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
2126                  * entries can be converted to *_OBJ. Don't do this for the default
2127                  * ACL, we will create them separately for this if needed inside
2128                  * ensure_canon_entry_valid().
2129                  */
2130                 if (file_ace) {
2131                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
2132                 }
2133         }
2134
2135         *ppfile_ace = file_ace;
2136         *ppdir_ace = dir_ace;
2137
2138         return True;
2139 }
2140
2141 /****************************************************************************
2142  ASCII art time again... JRA :-).
2143
2144  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2145  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2146  entries). Secondly, the merge code has ensured that all duplicate SID entries for
2147  allow or deny have been merged, so the same SID can only appear once in the deny
2148  list or once in the allow list.
2149
2150  We then process as follows :
2151
2152  ---------------------------------------------------------------------------
2153  First pass - look for a Everyone DENY entry.
2154
2155  If it is deny all (rwx) trunate the list at this point.
2156  Else, walk the list from this point and use the deny permissions of this
2157  entry as a mask on all following allow entries. Finally, delete
2158  the Everyone DENY entry (we have applied it to everything possible).
2159
2160  In addition, in this pass we remove any DENY entries that have
2161  no permissions (ie. they are a DENY nothing).
2162  ---------------------------------------------------------------------------
2163  Second pass - only deal with deny user entries.
2164
2165  DENY user1 (perms XXX)
2166
2167  new_perms = 0
2168  for all following allow group entries where user1 is in group
2169         new_perms |= group_perms;
2170
2171  user1 entry perms = new_perms & ~ XXX;
2172
2173  Convert the deny entry to an allow entry with the new perms and
2174  push to the end of the list. Note if the user was in no groups
2175  this maps to a specific allow nothing entry for this user.
2176
2177  The common case from the NT ACL choser (userX deny all) is
2178  optimised so we don't do the group lookup - we just map to
2179  an allow nothing entry.
2180
2181  What we're doing here is inferring the allow permissions the
2182  person setting the ACE on user1 wanted by looking at the allow
2183  permissions on the groups the user is currently in. This will
2184  be a snapshot, depending on group membership but is the best
2185  we can do and has the advantage of failing closed rather than
2186  open.
2187  ---------------------------------------------------------------------------
2188  Third pass - only deal with deny group entries.
2189
2190  DENY group1 (perms XXX)
2191
2192  for all following allow user entries where user is in group1
2193    user entry perms = user entry perms & ~ XXX;
2194
2195  If there is a group Everyone allow entry with permissions YYY,
2196  convert the group1 entry to an allow entry and modify its
2197  permissions to be :
2198
2199  new_perms = YYY & ~ XXX
2200
2201  and push to the end of the list.
2202
2203  If there is no group Everyone allow entry then convert the
2204  group1 entry to a allow nothing entry and push to the end of the list.
2205
2206  Note that the common case from the NT ACL choser (groupX deny all)
2207  cannot be optimised here as we need to modify user entries who are
2208  in the group to change them to a deny all also.
2209
2210  What we're doing here is modifying the allow permissions of
2211  user entries (which are more specific in POSIX ACLs) to mask
2212  out the explicit deny set on the group they are in. This will
2213  be a snapshot depending on current group membership but is the
2214  best we can do and has the advantage of failing closed rather
2215  than open.
2216  ---------------------------------------------------------------------------
2217  Fourth pass - cope with cumulative permissions.
2218
2219  for all allow user entries, if there exists an allow group entry with
2220  more permissive permissions, and the user is in that group, rewrite the
2221  allow user permissions to contain both sets of permissions.
2222
2223  Currently the code for this is #ifdef'ed out as these semantics make
2224  no sense to me. JRA.
2225  ---------------------------------------------------------------------------
2226
2227  Note we *MUST* do the deny user pass first as this will convert deny user
2228  entries into allow user entries which can then be processed by the deny
2229  group pass.
2230
2231  The above algorithm took a *lot* of thinking about - hence this
2232  explaination :-). JRA.
2233 ****************************************************************************/
2234
2235 /****************************************************************************
2236  Process a canon_ace list entries. This is very complex code. We need
2237  to go through and remove the "deny" permissions from any allow entry that matches
2238  the id of this entry. We have already refused any NT ACL that wasn't in correct
2239  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2240  we just remove it (to fail safe). We have already removed any duplicate ace
2241  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2242  allow entries.
2243 ****************************************************************************/
2244
2245 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2246 {
2247         canon_ace *ace_list = *pp_ace_list;
2248         canon_ace *curr_ace = NULL;
2249         canon_ace *curr_ace_next = NULL;
2250
2251         /* Pass 1 above - look for an Everyone, deny entry. */
2252
2253         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2254                 canon_ace *allow_ace_p;
2255
2256                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2257
2258                 if (curr_ace->attr != DENY_ACE)
2259                         continue;
2260
2261                 if (curr_ace->perms == (mode_t)0) {
2262
2263                         /* Deny nothing entry - delete. */
2264
2265                         DLIST_REMOVE(ace_list, curr_ace);
2266                         continue;
2267                 }
2268
2269                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2270                         continue;
2271
2272                 /* JRATEST - assert. */
2273                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2274
2275                 if (curr_ace->perms == ALL_ACE_PERMS) {
2276
2277                         /*
2278                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2279                          * list at this point including this entry.
2280                          */
2281
2282                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2283
2284                         free_canon_ace_list( curr_ace );
2285                         if (prev_entry)
2286                                 DLIST_REMOVE(ace_list, prev_entry);
2287                         else {
2288                                 /* We deleted the entire list. */
2289                                 ace_list = NULL;
2290                         }
2291                         break;
2292                 }
2293
2294                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2295
2296                         /*
2297                          * Only mask off allow entries.
2298                          */
2299
2300                         if (allow_ace_p->attr != ALLOW_ACE)
2301                                 continue;
2302
2303                         allow_ace_p->perms &= ~curr_ace->perms;
2304                 }
2305
2306                 /*
2307                  * Now it's been applied, remove it.
2308                  */
2309
2310                 DLIST_REMOVE(ace_list, curr_ace);
2311         }
2312
2313         /* Pass 2 above - deal with deny user entries. */
2314
2315         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2316                 mode_t new_perms = (mode_t)0;
2317                 canon_ace *allow_ace_p;
2318
2319                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2320
2321                 if (curr_ace->attr != DENY_ACE)
2322                         continue;
2323
2324                 if (curr_ace->owner_type != UID_ACE)
2325                         continue;
2326
2327                 if (curr_ace->perms == ALL_ACE_PERMS) {
2328
2329                         /*
2330                          * Optimisation - this is a deny everything to this user.
2331                          * Convert to an allow nothing and push to the end of the list.
2332                          */
2333
2334                         curr_ace->attr = ALLOW_ACE;
2335                         curr_ace->perms = (mode_t)0;
2336                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2337                         continue;
2338                 }
2339
2340                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2341
2342                         if (allow_ace_p->attr != ALLOW_ACE)
2343                                 continue;
2344
2345                         /* We process GID_ACE and WORLD_ACE entries only. */
2346
2347                         if (allow_ace_p->owner_type == UID_ACE)
2348                                 continue;
2349
2350                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2351                                 new_perms |= allow_ace_p->perms;
2352                 }
2353
2354                 /*
2355                  * Convert to a allow entry, modify the perms and push to the end
2356                  * of the list.
2357                  */
2358
2359                 curr_ace->attr = ALLOW_ACE;
2360                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2361                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2362         }
2363
2364         /* Pass 3 above - deal with deny group entries. */
2365
2366         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2367                 canon_ace *allow_ace_p;
2368                 canon_ace *allow_everyone_p = NULL;
2369
2370                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2371
2372                 if (curr_ace->attr != DENY_ACE)
2373                         continue;
2374
2375                 if (curr_ace->owner_type != GID_ACE)
2376                         continue;
2377
2378                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2379
2380                         if (allow_ace_p->attr != ALLOW_ACE)
2381                                 continue;
2382
2383                         /* Store a pointer to the Everyone allow, if it exists. */
2384                         if (allow_ace_p->owner_type == WORLD_ACE)
2385                                 allow_everyone_p = allow_ace_p;
2386
2387                         /* We process UID_ACE entries only. */
2388
2389                         if (allow_ace_p->owner_type != UID_ACE)
2390                                 continue;
2391
2392                         /* Mask off the deny group perms. */
2393
2394                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2395                                 allow_ace_p->perms &= ~curr_ace->perms;
2396                 }
2397
2398                 /*
2399                  * Convert the deny to an allow with the correct perms and
2400                  * push to the end of the list.
2401                  */
2402
2403                 curr_ace->attr = ALLOW_ACE;
2404                 if (allow_everyone_p)
2405                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2406                 else
2407                         curr_ace->perms = (mode_t)0;
2408                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2409         }
2410
2411         /* Doing this fourth pass allows Windows semantics to be layered
2412          * on top of POSIX semantics. I'm not sure if this is desirable.
2413          * For example, in W2K ACLs there is no way to say, "Group X no
2414          * access, user Y full access" if user Y is a member of group X.
2415          * This seems completely broken semantics to me.... JRA.
2416          */
2417
2418 #if 0
2419         /* Pass 4 above - deal with allow entries. */
2420
2421         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2422                 canon_ace *allow_ace_p;
2423
2424                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2425
2426                 if (curr_ace->attr != ALLOW_ACE)
2427                         continue;
2428
2429                 if (curr_ace->owner_type != UID_ACE)
2430                         continue;
2431
2432                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2433
2434                         if (allow_ace_p->attr != ALLOW_ACE)
2435                                 continue;
2436
2437                         /* We process GID_ACE entries only. */
2438
2439                         if (allow_ace_p->owner_type != GID_ACE)
2440                                 continue;
2441
2442                         /* OR in the group perms. */
2443
2444                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2445                                 curr_ace->perms |= allow_ace_p->perms;
2446                 }
2447         }
2448 #endif
2449
2450         *pp_ace_list = ace_list;
2451 }
2452
2453 /****************************************************************************
2454  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2455  succeeding.
2456 ****************************************************************************/
2457
2458 static bool unpack_canon_ace(files_struct *fsp,
2459                                 const SMB_STRUCT_STAT *pst,
2460                                 struct dom_sid *pfile_owner_sid,
2461                                 struct dom_sid *pfile_grp_sid,
2462                                 canon_ace **ppfile_ace,
2463                                 canon_ace **ppdir_ace,
2464                                 uint32 security_info_sent,
2465                                 const struct security_descriptor *psd)
2466 {
2467         canon_ace *file_ace = NULL;
2468         canon_ace *dir_ace = NULL;
2469
2470         *ppfile_ace = NULL;
2471         *ppdir_ace = NULL;
2472
2473         if(security_info_sent == 0) {
2474                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2475                 return False;
2476         }
2477
2478         /*
2479          * If no DACL then this is a chown only security descriptor.
2480          */
2481
2482         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2483                 return True;
2484
2485         /*
2486          * Now go through the DACL and create the canon_ace lists.
2487          */
2488
2489         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2490                                                                 &file_ace, &dir_ace, psd->dacl))
2491                 return False;
2492
2493         if ((file_ace == NULL) && (dir_ace == NULL)) {
2494                 /* W2K traverse DACL set - ignore. */
2495                 return True;
2496         }
2497
2498         /*
2499          * Go through the canon_ace list and merge entries
2500          * belonging to identical users of identical allow or deny type.
2501          * We can do this as all deny entries come first, followed by
2502          * all allow entries (we have mandated this before accepting this acl).
2503          */
2504
2505         print_canon_ace_list( "file ace - before merge", file_ace);
2506         merge_aces( &file_ace, false);
2507
2508         print_canon_ace_list( "dir ace - before merge", dir_ace);
2509         merge_aces( &dir_ace, true);
2510
2511         /*
2512          * NT ACLs are order dependent. Go through the acl lists and
2513          * process DENY entries by masking the allow entries.
2514          */
2515
2516         print_canon_ace_list( "file ace - before deny", file_ace);
2517         process_deny_list(fsp->conn, &file_ace);
2518
2519         print_canon_ace_list( "dir ace - before deny", dir_ace);
2520         process_deny_list(fsp->conn, &dir_ace);
2521
2522         /*
2523          * A well formed POSIX file or default ACL has at least 3 entries, a
2524          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2525          * and optionally a mask entry. Ensure this is the case.
2526          */
2527
2528         print_canon_ace_list( "file ace - before valid", file_ace);
2529
2530         if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2531                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2532                 free_canon_ace_list(file_ace);
2533                 free_canon_ace_list(dir_ace);
2534                 return False;
2535         }
2536
2537         print_canon_ace_list( "dir ace - before valid", dir_ace);
2538
2539         if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2540                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2541                 free_canon_ace_list(file_ace);
2542                 free_canon_ace_list(dir_ace);
2543                 return False;
2544         }
2545
2546         print_canon_ace_list( "file ace - return", file_ace);
2547         print_canon_ace_list( "dir ace - return", dir_ace);
2548
2549         *ppfile_ace = file_ace;
2550         *ppdir_ace = dir_ace;
2551         return True;
2552
2553 }
2554
2555 /******************************************************************************
2556  When returning permissions, try and fit NT display
2557  semantics if possible. Note the the canon_entries here must have been malloced.
2558  The list format should be - first entry = owner, followed by group and other user
2559  entries, last entry = other.
2560
2561  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2562  are not ordered, and match on the most specific entry rather than walking a list,
2563  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2564
2565  Entry 0: owner : deny all except read and write.
2566  Entry 1: owner : allow read and write.
2567  Entry 2: group : deny all except read.
2568  Entry 3: group : allow read.
2569  Entry 4: Everyone : allow read.
2570
2571  But NT cannot display this in their ACL editor !
2572 ********************************************************************************/
2573
2574 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2575 {
2576         canon_ace *l_head = *pp_list_head;
2577         canon_ace *owner_ace = NULL;
2578         canon_ace *other_ace = NULL;
2579         canon_ace *ace = NULL;
2580
2581         for (ace = l_head; ace; ace = ace->next) {
2582                 if (ace->type == SMB_ACL_USER_OBJ)
2583                         owner_ace = ace;
2584                 else if (ace->type == SMB_ACL_OTHER) {
2585                         /* Last ace - this is "other" */
2586                         other_ace = ace;
2587                 }
2588         }
2589
2590         if (!owner_ace || !other_ace) {
2591                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2592                         filename ));
2593                 return;
2594         }
2595
2596         /*
2597          * The POSIX algorithm applies to owner first, and other last,
2598          * so ensure they are arranged in this order.
2599          */
2600
2601         if (owner_ace) {
2602                 DLIST_PROMOTE(l_head, owner_ace);
2603         }
2604
2605         if (other_ace) {
2606                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2607         }
2608
2609         /* We have probably changed the head of the list. */
2610
2611         *pp_list_head = l_head;
2612 }
2613
2614 /****************************************************************************
2615  Create a linked list of canonical ACE entries.
2616 ****************************************************************************/
2617
2618 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2619                                    const char *fname, SMB_ACL_T posix_acl,
2620                                    const SMB_STRUCT_STAT *psbuf,
2621                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2622 {
2623         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2624         canon_ace *l_head = NULL;
2625         canon_ace *ace = NULL;
2626         canon_ace *next_ace = NULL;
2627         int entry_id = SMB_ACL_FIRST_ENTRY;
2628         SMB_ACL_ENTRY_T entry;
2629         size_t ace_count;
2630
2631         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2632                 SMB_ACL_TAG_T tagtype;
2633                 SMB_ACL_PERMSET_T permset;
2634                 struct dom_sid sid;
2635                 posix_id unix_ug;
2636                 enum ace_owner owner_type;
2637
2638                 entry_id = SMB_ACL_NEXT_ENTRY;
2639
2640                 /* Is this a MASK entry ? */
2641                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2642                         continue;
2643
2644                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2645                         continue;
2646
2647                 /* Decide which SID to use based on the ACL type. */
2648                 switch(tagtype) {
2649                         case SMB_ACL_USER_OBJ:
2650                                 /* Get the SID from the owner. */
2651                                 sid_copy(&sid, powner);
2652                                 unix_ug.uid = psbuf->st_ex_uid;
2653                                 owner_type = UID_ACE;
2654                                 break;
2655                         case SMB_ACL_USER:
2656                                 {
2657                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2658                                         if (puid == NULL) {
2659                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2660                                                 continue;
2661                                         }
2662                                         uid_to_sid( &sid, *puid);
2663                                         unix_ug.uid = *puid;
2664                                         owner_type = UID_ACE;
2665                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2666                                         break;
2667                                 }
2668                         case SMB_ACL_GROUP_OBJ:
2669                                 /* Get the SID from the owning group. */
2670                                 sid_copy(&sid, pgroup);
2671                                 unix_ug.gid = psbuf->st_ex_gid;
2672                                 owner_type = GID_ACE;
2673                                 break;
2674                         case SMB_ACL_GROUP:
2675                                 {
2676                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2677                                         if (pgid == NULL) {
2678                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2679                                                 continue;
2680                                         }
2681                                         gid_to_sid( &sid, *pgid);
2682                                         unix_ug.gid = *pgid;
2683                                         owner_type = GID_ACE;
2684                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2685                                         break;
2686                                 }
2687                         case SMB_ACL_MASK:
2688                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2689                                 continue; /* Don't count the mask as an entry. */
2690                         case SMB_ACL_OTHER:
2691                                 /* Use the Everyone SID */
2692                                 sid = global_sid_World;
2693                                 unix_ug.world = -1;
2694                                 owner_type = WORLD_ACE;
2695                                 break;
2696                         default:
2697                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2698                                 continue;
2699                 }
2700
2701                 /*
2702                  * Add this entry to the list.
2703                  */
2704
2705                 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2706                         goto fail;
2707
2708                 ZERO_STRUCTP(ace);
2709                 ace->type = tagtype;
2710                 ace->perms = convert_permset_to_mode_t(conn, permset);
2711                 ace->attr = ALLOW_ACE;
2712                 ace->trustee = sid;
2713                 ace->unix_ug = unix_ug;
2714                 ace->owner_type = owner_type;
2715                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2716
2717                 DLIST_ADD(l_head, ace);
2718         }
2719
2720         /*
2721          * This next call will ensure we have at least a user/group/world set.
2722          */
2723
2724         if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2725                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2726                                       psbuf, False))
2727                 goto fail;
2728
2729         /*
2730          * Now go through the list, masking the permissions with the
2731          * acl_mask. Ensure all DENY Entries are at the start of the list.
2732          */
2733
2734         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2735
2736         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2737                 next_ace = ace->next;
2738
2739                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2740                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2741                         ace->perms &= acl_mask;
2742
2743                 if (ace->perms == 0) {
2744                         DLIST_PROMOTE(l_head, ace);
2745                 }
2746
2747                 if( DEBUGLVL( 10 ) ) {
2748                         print_canon_ace(ace, ace_count);
2749                 }
2750         }
2751
2752         arrange_posix_perms(fname,&l_head );
2753
2754         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2755
2756         return l_head;
2757
2758   fail:
2759
2760         free_canon_ace_list(l_head);
2761         return NULL;
2762 }
2763
2764 /****************************************************************************
2765  Check if the current user group list contains a given group.
2766 ****************************************************************************/
2767
2768 bool current_user_in_group(connection_struct *conn, gid_t gid)
2769 {
2770         int i;
2771         const struct security_unix_token *utok = get_current_utok(conn);
2772
2773         for (i = 0; i < utok->ngroups; i++) {
2774                 if (utok->groups[i] == gid) {
2775                         return True;
2776                 }
2777         }
2778
2779         return False;
2780 }
2781
2782 /****************************************************************************
2783  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2784 ****************************************************************************/
2785
2786 static bool acl_group_override(connection_struct *conn,
2787                                const struct smb_filename *smb_fname)
2788 {
2789         if ((errno != EPERM) && (errno != EACCES)) {
2790                 return false;
2791         }
2792
2793         /* file primary group == user primary or supplementary group */
2794         if (lp_acl_group_control(SNUM(conn)) &&
2795             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2796                 return true;
2797         }
2798
2799         /* user has writeable permission */
2800         if (lp_dos_filemode(SNUM(conn)) &&
2801             can_write_to_file(conn, smb_fname)) {
2802                 return true;
2803         }
2804
2805         return false;
2806 }
2807
2808 /****************************************************************************
2809  Attempt to apply an ACL to a file or directory.
2810 ****************************************************************************/
2811
2812 static bool set_canon_ace_list(files_struct *fsp,
2813                                 canon_ace *the_ace,
2814                                 bool default_ace,
2815                                 const SMB_STRUCT_STAT *psbuf,
2816                                 bool *pacl_set_support)
2817 {
2818         connection_struct *conn = fsp->conn;
2819         bool ret = False;
2820         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2821         canon_ace *p_ace;
2822         int i;
2823         SMB_ACL_ENTRY_T mask_entry;
2824         bool got_mask_entry = False;
2825         SMB_ACL_PERMSET_T mask_permset;
2826         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2827         bool needs_mask = False;
2828         mode_t mask_perms = 0;
2829
2830         /* Use the psbuf that was passed in. */
2831         if (psbuf != &fsp->fsp_name->st) {
2832                 fsp->fsp_name->st = *psbuf;
2833         }
2834
2835 #if defined(POSIX_ACL_NEEDS_MASK)
2836         /* HP-UX always wants to have a mask (called "class" there). */
2837         needs_mask = True;
2838 #endif
2839
2840         if (the_acl == NULL) {
2841
2842                 if (!no_acl_syscall_error(errno)) {
2843                         /*
2844                          * Only print this error message if we have some kind of ACL
2845                          * support that's not working. Otherwise we would always get this.
2846                          */
2847                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2848                                 default_ace ? "default" : "file", strerror(errno) ));
2849                 }
2850                 *pacl_set_support = False;
2851                 goto fail;
2852         }
2853
2854         if( DEBUGLVL( 10 )) {
2855                 dbgtext("set_canon_ace_list: setting ACL:\n");
2856                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2857                         print_canon_ace( p_ace, i);
2858                 }
2859         }
2860
2861         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2862                 SMB_ACL_ENTRY_T the_entry;
2863                 SMB_ACL_PERMSET_T the_permset;
2864
2865                 /*
2866                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2867                  * named group entries. But if there is an ACL_MASK entry, it applies
2868                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2869                  * so that it doesn't deny (i.e., mask off) any permissions.
2870                  */
2871
2872                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2873                         needs_mask = True;
2874                         mask_perms |= p_ace->perms;
2875                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2876                         mask_perms |= p_ace->perms;
2877                 }
2878
2879                 /*
2880                  * Get the entry for this ACE.
2881                  */
2882
2883                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2884                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2885                                 i, strerror(errno) ));
2886                         goto fail;
2887                 }
2888
2889                 if (p_ace->type == SMB_ACL_MASK) {
2890                         mask_entry = the_entry;
2891                         got_mask_entry = True;
2892                 }
2893
2894                 /*
2895                  * Ok - we now know the ACL calls should be working, don't
2896                  * allow fallback to chmod.
2897                  */
2898
2899                 *pacl_set_support = True;
2900
2901                 /*
2902                  * Initialise the entry from the canon_ace.
2903                  */
2904
2905                 /*
2906                  * First tell the entry what type of ACE this is.
2907                  */
2908
2909                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2910                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2911                                 i, strerror(errno) ));
2912                         goto fail;
2913                 }
2914
2915                 /*
2916                  * Only set the qualifier (user or group id) if the entry is a user
2917                  * or group id ACE.
2918                  */
2919
2920                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2921                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2922                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2923                                         i, strerror(errno) ));
2924                                 goto fail;
2925                         }
2926                 }
2927
2928                 /*
2929                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2930                  */
2931
2932                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2933                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2934                                 i, strerror(errno) ));
2935                         goto fail;
2936                 }
2937
2938                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2939                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2940                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2941                         goto fail;
2942                 }
2943
2944                 /*
2945                  * ..and apply them to the entry.
2946                  */
2947
2948                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2949                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2950                                 i, strerror(errno) ));
2951                         goto fail;
2952                 }
2953
2954                 if( DEBUGLVL( 10 ))
2955                         print_canon_ace( p_ace, i);
2956
2957         }
2958
2959         if (needs_mask && !got_mask_entry) {
2960                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2961                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2962                         goto fail;
2963                 }
2964
2965                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2966                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2967                         goto fail;
2968                 }
2969
2970                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2971                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2972                         goto fail;
2973                 }
2974
2975                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2976                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2977                         goto fail;
2978                 }
2979
2980                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2981                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2982                         goto fail;
2983                 }
2984         }
2985
2986         /*
2987          * Finally apply it to the file or directory.
2988          */
2989
2990         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2991                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2992                                              the_acl_type, the_acl) == -1) {
2993                         /*
2994                          * Some systems allow all the above calls and only fail with no ACL support
2995                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2996                          */
2997                         if (no_acl_syscall_error(errno)) {
2998                                 *pacl_set_support = False;
2999                         }
3000
3001                         if (acl_group_override(conn, fsp->fsp_name)) {
3002                                 int sret;
3003
3004                                 DEBUG(5,("set_canon_ace_list: acl group "
3005                                          "control on and current user in file "
3006                                          "%s primary group.\n",
3007                                          fsp_str_dbg(fsp)));
3008
3009                                 become_root();
3010                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
3011                                     fsp->fsp_name->base_name, the_acl_type,
3012                                     the_acl);
3013                                 unbecome_root();
3014                                 if (sret == 0) {
3015                                         ret = True;
3016                                 }
3017                         }
3018
3019                         if (ret == False) {
3020                                 DEBUG(2,("set_canon_ace_list: "
3021                                          "sys_acl_set_file type %s failed for "
3022                                          "file %s (%s).\n",
3023                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
3024                                          "directory default" : "file",
3025                                          fsp_str_dbg(fsp), strerror(errno)));
3026                                 goto fail;
3027                         }
3028                 }
3029         } else {
3030                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
3031                         /*
3032                          * Some systems allow all the above calls and only fail with no ACL support
3033                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3034                          */
3035                         if (no_acl_syscall_error(errno)) {
3036                                 *pacl_set_support = False;
3037                         }
3038
3039                         if (acl_group_override(conn, fsp->fsp_name)) {
3040                                 int sret;
3041
3042                                 DEBUG(5,("set_canon_ace_list: acl group "
3043                                          "control on and current user in file "
3044                                          "%s primary group.\n",
3045                                          fsp_str_dbg(fsp)));
3046
3047                                 become_root();
3048                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
3049                                 unbecome_root();
3050                                 if (sret == 0) {
3051                                         ret = True;
3052                                 }
3053                         }
3054
3055                         if (ret == False) {
3056                                 DEBUG(2,("set_canon_ace_list: "
3057                                          "sys_acl_set_file failed for file %s "
3058                                          "(%s).\n",
3059                                          fsp_str_dbg(fsp), strerror(errno)));
3060                                 goto fail;
3061                         }
3062                 }
3063         }
3064
3065         ret = True;
3066
3067   fail:
3068
3069         if (the_acl != NULL) {
3070                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
3071         }
3072
3073         return ret;
3074 }
3075
3076 /****************************************************************************
3077  Find a particular canon_ace entry.
3078 ****************************************************************************/
3079
3080 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
3081 {
3082         while (list) {
3083                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
3084                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
3085                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
3086                         break;
3087                 list = list->next;
3088         }
3089         return list;
3090 }
3091
3092 /****************************************************************************
3093
3094 ****************************************************************************/
3095
3096 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
3097 {
3098         SMB_ACL_ENTRY_T entry;
3099
3100         if (!the_acl)
3101                 return NULL;
3102         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
3103                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
3104                 return NULL;
3105         }
3106         return the_acl;
3107 }
3108
3109 /****************************************************************************
3110  Convert a canon_ace to a generic 3 element permission - if possible.
3111 ****************************************************************************/
3112
3113 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3114
3115 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3116 {
3117         int snum = SNUM(fsp->conn);
3118         size_t ace_count = count_canon_ace_list(file_ace_list);
3119         canon_ace *ace_p;
3120         canon_ace *owner_ace = NULL;
3121         canon_ace *group_ace = NULL;
3122         canon_ace *other_ace = NULL;
3123         mode_t and_bits;
3124         mode_t or_bits;
3125
3126         if (ace_count != 3) {
3127                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3128                          "entries for file %s to convert to posix perms.\n",
3129                          fsp_str_dbg(fsp)));
3130                 return False;
3131         }
3132
3133         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3134                 if (ace_p->owner_type == UID_ACE)
3135                         owner_ace = ace_p;
3136                 else if (ace_p->owner_type == GID_ACE)
3137                         group_ace = ace_p;
3138                 else if (ace_p->owner_type == WORLD_ACE)
3139                         other_ace = ace_p;
3140         }
3141
3142         if (!owner_ace || !group_ace || !other_ace) {
3143                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3144                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3145                 return False;
3146         }
3147
3148         *posix_perms = (mode_t)0;
3149
3150         *posix_perms |= owner_ace->perms;
3151         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3152         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3153         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3154         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3155         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3156         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3157
3158         /* The owner must have at least read access. */
3159
3160         *posix_perms |= S_IRUSR;
3161         if (fsp->is_directory)
3162                 *posix_perms |= (S_IWUSR|S_IXUSR);
3163
3164         /* If requested apply the masks. */
3165
3166         /* Get the initial bits to apply. */
3167
3168         if (fsp->is_directory) {
3169                 and_bits = lp_dir_security_mask(snum);
3170                 or_bits = lp_force_dir_security_mode(snum);
3171         } else {
3172                 and_bits = lp_security_mask(snum);
3173                 or_bits = lp_force_security_mode(snum);
3174         }
3175
3176         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3177
3178         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3179                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3180                   (int)group_ace->perms, (int)other_ace->perms,
3181                   (int)*posix_perms, fsp_str_dbg(fsp)));
3182
3183         return True;
3184 }
3185
3186 /****************************************************************************
3187   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3188   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3189   with CI|OI set so it is inherited and also applies to the directory.
3190   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3191 ****************************************************************************/
3192
3193 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3194 {
3195         size_t i, j;
3196
3197         for (i = 0; i < num_aces; i++) {
3198                 for (j = i+1; j < num_aces; j++) {
3199                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3200                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3201                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3202                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3203
3204                         /* We know the lower number ACE's are file entries. */
3205                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3206                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3207                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3208                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3209                                 (i_inh == j_inh) &&
3210                                 (i_flags_ni == 0) &&
3211                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3212                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3213                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3214                                 /*
3215                                  * W2K wants to have access allowed zero access ACE's
3216                                  * at the end of the list. If the mask is zero, merge
3217                                  * the non-inherited ACE onto the inherited ACE.
3218                                  */
3219
3220                                 if (nt_ace_list[i].access_mask == 0) {
3221                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3222                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3223                                         if (num_aces - i - 1 > 0)
3224                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3225                                                                 sizeof(struct security_ace));
3226
3227                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3228                                                 (unsigned int)i, (unsigned int)j ));
3229                                 } else {
3230                                         /*
3231                                          * These are identical except for the flags.
3232                                          * Merge the inherited ACE onto the non-inherited ACE.
3233                                          */
3234
3235                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3236                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3237                                         if (num_aces - j - 1 > 0)
3238                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3239                                                                 sizeof(struct security_ace));
3240
3241                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3242                                                 (unsigned int)j, (unsigned int)i ));
3243                                 }
3244                                 num_aces--;
3245                                 break;
3246                         }
3247                 }
3248         }
3249
3250         return num_aces;
3251 }
3252
3253 /*
3254  * Add or Replace ACE entry.
3255  * In some cases we need to add a specific ACE for compatibility reasons.
3256  * When doing that we must make sure we are not actually creating a duplicate
3257  * entry. So we need to search whether an ACE entry already exist and eventually
3258  * replacce the access mask, or add a completely new entry if none was found.
3259  *
3260  * This function assumes the array has enough space to add a new entry without
3261  * any reallocation of memory.
3262  */
3263
3264 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3265                                 const struct dom_sid *sid, enum security_ace_type type,
3266                                 uint32_t mask, uint8_t flags)
3267 {
3268         int i;
3269
3270         /* first search for a duplicate */
3271         for (i = 0; i < *num_aces; i++) {
3272                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3273                     (nt_ace_list[i].flags == flags)) break;
3274         }
3275
3276         if (i < *num_aces) { /* found */
3277                 nt_ace_list[i].type = type;
3278                 nt_ace_list[i].access_mask = mask;
3279                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3280                            i, sid_string_dbg(sid), flags));
3281                 return;
3282         }
3283
3284         /* not found, append it */
3285         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3286 }
3287
3288
3289 /****************************************************************************
3290  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3291  the space for the return elements and returns the size needed to return the
3292  security descriptor. This should be the only external function needed for
3293  the UNIX style get ACL.
3294 ****************************************************************************/
3295
3296 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3297                                       const char *name,
3298                                       const SMB_STRUCT_STAT *sbuf,
3299                                       struct pai_val *pal,
3300                                       SMB_ACL_T posix_acl,
3301                                       SMB_ACL_T def_acl,
3302                                       uint32_t security_info,
3303                                       struct security_descriptor **ppdesc)
3304 {
3305         struct dom_sid owner_sid;
3306         struct dom_sid group_sid;
3307         size_t sd_size = 0;
3308         struct security_acl *psa = NULL;
3309         size_t num_acls = 0;
3310         size_t num_def_acls = 0;
3311         size_t num_aces = 0;
3312         canon_ace *file_ace = NULL;
3313         canon_ace *dir_ace = NULL;
3314         struct security_ace *nt_ace_list = NULL;
3315         size_t num_profile_acls = 0;
3316         struct dom_sid orig_owner_sid;
3317         struct security_descriptor *psd = NULL;
3318         int i;
3319
3320         /*
3321          * Get the owner, group and world SIDs.
3322          */
3323
3324         create_file_sids(sbuf, &owner_sid, &group_sid);
3325
3326         if (lp_profile_acls(SNUM(conn))) {
3327                 /* For WXP SP1 the owner must be administrators. */
3328                 sid_copy(&orig_owner_sid, &owner_sid);
3329                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3330                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3331                 num_profile_acls = 3;
3332         }
3333
3334         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3335
3336                 /*
3337                  * In the optimum case Creator Owner and Creator Group would be used for
3338                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3339                  * would lead to usability problems under Windows: The Creator entries
3340                  * are only available in browse lists of directories and not for files;
3341                  * additionally the identity of the owning group couldn't be determined.
3342                  * We therefore use those identities only for Default ACLs.
3343                  */
3344
3345                 /* Create the canon_ace lists. */
3346                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3347                                             &owner_sid, &group_sid, pal,
3348                                             SMB_ACL_TYPE_ACCESS);
3349
3350                 /* We must have *some* ACLS. */
3351
3352                 if (count_canon_ace_list(file_ace) == 0) {
3353                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3354                         goto done;
3355                 }
3356
3357                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3358                         dir_ace = canonicalise_acl(conn, name, def_acl,
3359                                                    sbuf,
3360                                                    &global_sid_Creator_Owner,
3361                                                    &global_sid_Creator_Group,
3362                                                    pal, SMB_ACL_TYPE_DEFAULT);
3363                 }
3364
3365                 /*
3366                  * Create the NT ACE list from the canonical ace lists.
3367                  */
3368
3369                 {
3370                         canon_ace *ace;
3371                         enum security_ace_type nt_acl_type;
3372
3373                         if (nt4_compatible_acls() && dir_ace) {
3374                                 /*
3375                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3376                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3377                                  * remove entries from the Access ACL if the
3378                                  * corresponding Default ACL entries have also been
3379                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3380                                  * are exceptions. We can do nothing
3381                                  * intelligent if the Default ACL contains entries that
3382                                  * are not also contained in the Access ACL, so this
3383                                  * case will still fail under NT 4.
3384                                  */
3385
3386                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3387                                 if (ace && !ace->perms) {
3388                                         DLIST_REMOVE(dir_ace, ace);
3389                                         TALLOC_FREE(ace);
3390
3391                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3392                                         if (ace && !ace->perms) {
3393                                                 DLIST_REMOVE(file_ace, ace);
3394                                                 TALLOC_FREE(ace);
3395                                         }
3396                                 }
3397
3398                                 /*
3399                                  * WinNT doesn't usually have Creator Group
3400                                  * in browse lists, so we send this entry to
3401                                  * WinNT even if it contains no relevant
3402                                  * permissions. Once we can add
3403                                  * Creator Group to browse lists we can
3404                                  * re-enable this.
3405                                  */
3406
3407 #if 0
3408                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3409                                 if (ace && !ace->perms) {
3410                                         DLIST_REMOVE(dir_ace, ace);
3411                                         TALLOC_FREE(ace);
3412                                 }
3413 #endif
3414
3415                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3416                                 if (ace && !ace->perms) {
3417                                         DLIST_REMOVE(file_ace, ace);
3418                                         TALLOC_FREE(ace);
3419                                 }
3420                         }
3421
3422                         num_acls = count_canon_ace_list(file_ace);
3423                         num_def_acls = count_canon_ace_list(dir_ace);
3424
3425                         /* Allocate the ace list. */
3426                         if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3427                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3428                                 goto done;
3429                         }
3430
3431                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3432
3433                         /*
3434                          * Create the NT ACE list from the canonical ace lists.
3435                          */
3436
3437                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3438                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3439                                                 &nt_acl_type,
3440                                                 ace->perms,
3441                                                 S_ISDIR(sbuf->st_ex_mode));
3442                                 init_sec_ace(&nt_ace_list[num_aces++],
3443                                         &ace->trustee,
3444                                         nt_acl_type,
3445                                         acc,
3446                                         ace->ace_flags);
3447                         }
3448
3449                         /* The User must have access to a profile share - even
3450                          * if we can't map the SID. */
3451                         if (lp_profile_acls(SNUM(conn))) {
3452                                 add_or_replace_ace(nt_ace_list, &num_aces,
3453                                                    &global_sid_Builtin_Users,
3454                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3455                                                    FILE_GENERIC_ALL, 0);
3456                         }
3457
3458                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3459                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3460                                                 &nt_acl_type,
3461                                                 ace->perms,
3462                                                 S_ISDIR(sbuf->st_ex_mode));
3463                                 init_sec_ace(&nt_ace_list[num_aces++],
3464                                         &ace->trustee,
3465                                         nt_acl_type,
3466                                         acc,
3467                                         ace->ace_flags |
3468                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3469                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3470                                         SEC_ACE_FLAG_INHERIT_ONLY);
3471                         }
3472
3473                         /* The User must have access to a profile share - even
3474                          * if we can't map the SID. */
3475                         if (lp_profile_acls(SNUM(conn))) {
3476                                 add_or_replace_ace(nt_ace_list, &num_aces,
3477                                                 &global_sid_Builtin_Users,
3478                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3479                                                 FILE_GENERIC_ALL,
3480                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3481                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3482                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3483                         }
3484
3485                         /*
3486                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3487                          * Win2K needs this to get the inheritance correct when replacing ACLs
3488                          * on a directory tree. Based on work by Jim @ IBM.
3489                          */
3490
3491                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3492
3493                         if (lp_profile_acls(SNUM(conn))) {
3494                                 for (i = 0; i < num_aces; i++) {
3495                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3496                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3497                                                                    &orig_owner_sid,
3498                                                                    nt_ace_list[i].type,
3499                                                                    nt_ace_list[i].access_mask,
3500                                                                    nt_ace_list[i].flags);
3501                                                 break;
3502                                         }
3503                                 }
3504                         }
3505                 }
3506
3507                 if (num_aces) {
3508                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3509                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3510                                 goto done;
3511                         }
3512                 }
3513         } /* security_info & SECINFO_DACL */
3514
3515         psd = make_standard_sec_desc( talloc_tos(),
3516                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3517                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3518                         psa,
3519                         &sd_size);
3520
3521         if(!psd) {
3522                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3523                 sd_size = 0;
3524                 goto done;
3525         }
3526
3527         /*
3528          * Windows 2000: The DACL_PROTECTED flag in the security
3529          * descriptor marks the ACL as non-inheriting, i.e., no
3530          * ACEs from higher level directories propagate to this
3531          * ACL. In the POSIX ACL model permissions are only
3532          * inherited at file create time, so ACLs never contain
3533          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3534          * flag doesn't seem to bother Windows NT.
3535          * Always set this if map acl inherit is turned off.
3536          */
3537         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3538                 psd->type |= SEC_DESC_DACL_PROTECTED;
3539         } else {
3540                 psd->type |= pal->sd_type;
3541         }
3542
3543         if (psd->dacl) {
3544                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3545         }
3546
3547         *ppdesc = psd;
3548
3549  done:
3550
3551         if (posix_acl) {
3552                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3553         }
3554         if (def_acl) {
3555                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3556         }
3557         free_canon_ace_list(file_ace);
3558         free_canon_ace_list(dir_ace);
3559         free_inherited_info(pal);
3560         TALLOC_FREE(nt_ace_list);
3561
3562         return NT_STATUS_OK;
3563 }
3564
3565 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3566                            struct security_descriptor **ppdesc)
3567 {
3568         SMB_STRUCT_STAT sbuf;
3569         SMB_ACL_T posix_acl = NULL;
3570         struct pai_val *pal;
3571
3572         *ppdesc = NULL;
3573
3574         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3575                   fsp_str_dbg(fsp)));
3576
3577         /* can it happen that fsp_name == NULL ? */
3578         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3579                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3580                                         security_info, ppdesc);
3581         }
3582
3583         /* Get the stat struct for the owner info. */
3584         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3585                 return map_nt_error_from_unix(errno);
3586         }
3587
3588         /* Get the ACL from the fd. */
3589         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3590
3591         pal = fload_inherited_info(fsp);
3592
3593         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3594                                        &sbuf, pal, posix_acl, NULL,
3595                                        security_info, ppdesc);
3596 }
3597
3598 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3599                           uint32_t security_info, struct security_descriptor **ppdesc)
3600 {
3601         SMB_ACL_T posix_acl = NULL;
3602         SMB_ACL_T def_acl = NULL;
3603         struct pai_val *pal;
3604         struct smb_filename smb_fname;
3605         int ret;
3606
3607         *ppdesc = NULL;
3608
3609         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3610
3611         ZERO_STRUCT(smb_fname);
3612         smb_fname.base_name = discard_const_p(char, name);
3613
3614         /* Get the stat struct for the owner info. */
3615         if (lp_posix_pathnames()) {
3616                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3617         } else {
3618                 ret = SMB_VFS_STAT(conn, &smb_fname);
3619         }
3620
3621         if (ret == -1) {
3622                 return map_nt_error_from_unix(errno);
3623         }
3624
3625         /* Get the ACL from the path. */
3626         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3627
3628         /* If it's a directory get the default POSIX ACL. */
3629         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3630                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3631                 def_acl = free_empty_sys_acl(conn, def_acl);
3632         }
3633
3634         pal = load_inherited_info(conn, name);
3635
3636         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3637                                        posix_acl, def_acl, security_info,
3638                                        ppdesc);
3639 }
3640
3641 /****************************************************************************
3642  Try to chown a file. We will be able to chown it under the following conditions.
3643
3644   1) If we have root privileges, then it will just work.
3645   2) If we have SeRestorePrivilege we can change the user + group to any other user.
3646   3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3647   4) If we have write permission to the file and dos_filemodes is set
3648      then allow chown to the currently authenticated user.
3649 ****************************************************************************/
3650
3651 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3652 {
3653         NTSTATUS status;
3654
3655         if(!CAN_WRITE(fsp->conn)) {
3656                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3657         }
3658
3659         /* Case (1). */
3660         status = vfs_chown_fsp(fsp, uid, gid);
3661         if (NT_STATUS_IS_OK(status)) {
3662                 return status;
3663         }
3664
3665         /* Case (2) / (3) */
3666         if (lp_enable_privileges()) {
3667                 bool has_take_ownership_priv = security_token_has_privilege(
3668                                                 get_current_nttok(fsp->conn),
3669                                                 SEC_PRIV_TAKE_OWNERSHIP);
3670                 bool has_restore_priv = security_token_has_privilege(
3671                                                 get_current_nttok(fsp->conn),
3672                                                 SEC_PRIV_RESTORE);
3673
3674                 if (has_restore_priv) {
3675                         ; /* Case (2) */
3676                 } else if (has_take_ownership_priv) {
3677                         /* Case (3) */
3678                         if (uid == get_current_uid(fsp->conn)) {
3679                                 gid = (gid_t)-1;
3680                         } else {
3681                                 has_take_ownership_priv = false;
3682                         }
3683                 }
3684
3685                 if (has_take_ownership_priv || has_restore_priv) {
3686                         become_root();
3687                         status = vfs_chown_fsp(fsp, uid, gid);
3688                         unbecome_root();
3689                         return status;
3690                 }
3691         }
3692
3693         /* Case (4). */
3694         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3695                 return NT_STATUS_ACCESS_DENIED;
3696         }
3697
3698         /* only allow chown to the current user. This is more secure,
3699            and also copes with the case where the SID in a take ownership ACL is
3700            a local SID on the users workstation
3701         */
3702         if (uid != get_current_uid(fsp->conn)) {
3703                 return NT_STATUS_ACCESS_DENIED;
3704         }
3705
3706         become_root();
3707         /* Keep the current file gid the same. */
3708         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3709         unbecome_root();
3710
3711         return status;
3712 }
3713
3714 #if 0
3715 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3716
3717 /****************************************************************************
3718  Take care of parent ACL inheritance.
3719 ****************************************************************************/
3720
3721 NTSTATUS append_parent_acl(files_struct *fsp,
3722                                 const struct security_descriptor *pcsd,
3723                                 struct security_descriptor **pp_new_sd)
3724 {
3725         struct smb_filename *smb_dname = NULL;
3726         struct security_descriptor *parent_sd = NULL;
3727         files_struct *parent_fsp = NULL;
3728         TALLOC_CTX *mem_ctx = talloc_tos();
3729         char *parent_name = NULL;
3730         struct security_ace *new_ace = NULL;
3731         unsigned int num_aces = pcsd->dacl->num_aces;
3732         NTSTATUS status;
3733         int info;
3734         unsigned int i, j;
3735         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3736         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3737
3738         if (psd == NULL) {
3739                 return NT_STATUS_NO_MEMORY;
3740         }
3741
3742         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3743                             NULL)) {
3744                 return NT_STATUS_NO_MEMORY;
3745         }
3746
3747         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3748                                             &smb_dname);
3749         if (!NT_STATUS_IS_OK(status)) {
3750                 goto fail;
3751         }
3752
3753         status = SMB_VFS_CREATE_FILE(
3754                 fsp->conn,                              /* conn */
3755                 NULL,                                   /* req */
3756                 0,                                      /* root_dir_fid */
3757                 smb_dname,                              /* fname */
3758                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3759                 FILE_SHARE_NONE,                        /* share_access */
3760                 FILE_OPEN,                              /* create_disposition*/
3761                 FILE_DIRECTORY_FILE,                    /* create_options */
3762                 0,                                      /* file_attributes */
3763                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3764                 0,                                      /* allocation_size */
3765                 NULL,                                   /* sd */
3766                 NULL,                                   /* ea_list */
3767                 &parent_fsp,                            /* result */
3768                 &info);                                 /* pinfo */
3769
3770         if (!NT_STATUS_IS_OK(status)) {
3771                 TALLOC_FREE(smb_dname);
3772                 return status;
3773         }
3774
3775         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3776                                     SECINFO_DACL, &parent_sd );
3777
3778         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3779         TALLOC_FREE(smb_dname);
3780
3781         if (!NT_STATUS_IS_OK(status)) {
3782                 return status;
3783         }
3784
3785         /*
3786          * Make room for potentially all the ACLs from
3787          * the parent. We used to add the ugw triple here,
3788          * as we knew we were dealing with POSIX ACLs.
3789          * We no longer need to do so as we can guarentee
3790          * that a default ACL from the parent directory will
3791          * be well formed for POSIX ACLs if it came from a
3792          * POSIX ACL source, and if we're not writing to a
3793          * POSIX ACL sink then we don't care if it's not well
3794          * formed. JRA.
3795          */
3796
3797         num_aces += parent_sd->dacl->num_aces;
3798
3799         if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3800                                         num_aces)) == NULL) {
3801                 return NT_STATUS_NO_MEMORY;
3802         }
3803
3804         /* Start by copying in all the given ACE entries. */
3805         for (i = 0; i < psd->dacl->num_aces; i++) {
3806                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3807         }
3808
3809         /*
3810          * Note that we're ignoring "inherit permissions" here
3811          * as that really only applies to newly created files. JRA.
3812          */
3813
3814         /* Finally append any inherited ACEs. */
3815         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3816                 struct security_ace *se = &parent_sd->dacl->aces[j];
3817
3818                 if (fsp->is_directory) {
3819                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3820                                 /* Doesn't apply to a directory - ignore. */
3821                                 DEBUG(10,("append_parent_acl: directory %s "
3822                                         "ignoring non container "
3823                                         "inherit flags %u on ACE with sid %s "
3824                                         "from parent %s\n",
3825                                         fsp_str_dbg(fsp),
3826                                         (unsigned int)se->flags,
3827                                         sid_string_dbg(&se->trustee),
3828                                         parent_name));
3829                                 continue;
3830                         }
3831                 } else {
3832                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3833                                 /* Doesn't apply to a file - ignore. */
3834                                 DEBUG(10,("append_parent_acl: file %s "
3835                                         "ignoring non object "
3836                                         "inherit flags %u on ACE with sid %s "
3837                                         "from parent %s\n",
3838                                         fsp_str_dbg(fsp),
3839                                         (unsigned int)se->flags,
3840                                         sid_string_dbg(&se->trustee),
3841                                         parent_name));
3842                                 continue;
3843                         }
3844                 }
3845
3846                 if (is_dacl_protected) {
3847                         /* If the DACL is protected it means we must
3848                          * not overwrite an existing ACE entry with the
3849                          * same SID. This is order N^2. Ouch :-(. JRA. */
3850                         unsigned int k;
3851                         for (k = 0; k < psd->dacl->num_aces; k++) {
3852                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3853                                                 &se->trustee)) {
3854                                         break;
3855                                 }
3856                         }
3857                         if (k < psd->dacl->num_aces) {
3858                                 /* SID matched. Ignore. */
3859                                 DEBUG(10,("append_parent_acl: path %s "
3860                                         "ignoring ACE with protected sid %s "
3861                                         "from parent %s\n",
3862                                         fsp_str_dbg(fsp),
3863                                         sid_string_dbg(&se->trustee),
3864                                         parent_name));
3865                                 continue;
3866                         }
3867                 }
3868
3869                 sec_ace_copy(&new_ace[i], se);
3870                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3871                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3872                 }
3873                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3874
3875                 if (fsp->is_directory) {
3876                         /*
3877                          * Strip off any inherit only. It's applied.
3878                          */
3879                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3880                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3881                                 /* No further inheritance. */
3882                                 new_ace[i].flags &=
3883                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3884                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3885                         }
3886                 } else {
3887                         /*
3888                          * Strip off any container or inherit
3889                          * flags, they can't apply to objects.
3890                          */
3891                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3892                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3893                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3894                 }
3895                 i++;
3896
3897                 DEBUG(10,("append_parent_acl: path %s "
3898                         "inheriting ACE with sid %s "
3899                         "from parent %s\n",
3900                         fsp_str_dbg(fsp),
3901                         sid_string_dbg(&se->trustee),
3902                         parent_name));
3903         }
3904
3905         psd->dacl->aces = new_ace;
3906         psd->dacl->num_aces = i;
3907         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3908                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
3909
3910         *pp_new_sd = psd;
3911         return status;
3912 }
3913 #endif
3914
3915 /****************************************************************************
3916  Reply to set a security descriptor on an fsp. security_info_sent is the
3917  description of the following NT ACL.
3918  This should be the only external function needed for the UNIX style set ACL.
3919  We make a copy of psd_orig as internal functions modify the elements inside
3920  it, even though it's a const pointer.
3921 ****************************************************************************/
3922
3923 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3924 {
3925         connection_struct *conn = fsp->conn;
3926         uid_t user = (uid_t)-1;
3927         gid_t grp = (gid_t)-1;
3928         struct dom_sid file_owner_sid;
3929         struct dom_sid file_grp_sid;
3930         canon_ace *file_ace_list = NULL;
3931         canon_ace *dir_ace_list = NULL;
3932         bool acl_perms = False;
3933         mode_t orig_mode = (mode_t)0;
3934         NTSTATUS status;
3935         bool set_acl_as_root = false;
3936         bool acl_set_support = false;
3937         bool ret = false;
3938         struct security_descriptor *psd = NULL;
3939
3940         DEBUG(10,("set_nt_acl: called for file %s\n",
3941                   fsp_str_dbg(fsp)));
3942
3943         if (!CAN_WRITE(conn)) {
3944                 DEBUG(10,("set acl rejected on read-only share\n"));
3945                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3946         }
3947
3948         if (!psd_orig) {
3949                 return NT_STATUS_INVALID_PARAMETER;
3950         }
3951
3952         psd = dup_sec_desc(talloc_tos(), psd_orig);
3953         if (!psd) {
3954                 return NT_STATUS_NO_MEMORY;
3955         }
3956
3957         /*
3958          * Get the current state of the file.
3959          */
3960
3961         status = vfs_stat_fsp(fsp);
3962         if (!NT_STATUS_IS_OK(status)) {
3963                 return status;
3964         }
3965
3966         /* Save the original element we check against. */
3967         orig_mode = fsp->fsp_name->st.st_ex_mode;
3968
3969         /*
3970          * Unpack the user/group/world id's.
3971          */
3972
3973         /* POSIX can't cope with missing owner/group. */
3974         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3975                 security_info_sent &= ~SECINFO_OWNER;
3976         }
3977         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3978                 security_info_sent &= ~SECINFO_GROUP;
3979         }
3980
3981         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3982         if (!NT_STATUS_IS_OK(status)) {
3983                 return status;
3984         }
3985
3986         /*
3987          * Do we need to chown ? If so this must be done first as the incoming
3988          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3989          * Noticed by Simo.
3990          */
3991
3992         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3993             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3994
3995                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3996                          fsp_str_dbg(fsp), (unsigned int)user,
3997                          (unsigned int)grp));
3998
3999                 status = try_chown(fsp, user, grp);
4000                 if(!NT_STATUS_IS_OK(status)) {
4001                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
4002                                 "= %s.\n", fsp_str_dbg(fsp),
4003                                 (unsigned int)user,
4004                                 (unsigned int)grp,
4005                                 nt_errstr(status)));
4006                         return status;
4007                 }
4008
4009                 /*
4010                  * Recheck the current state of the file, which may have changed.
4011                  * (suid/sgid bits, for instance)
4012                  */
4013
4014                 status = vfs_stat_fsp(fsp);
4015                 if (!NT_STATUS_IS_OK(status)) {
4016                         return status;
4017                 }
4018
4019                 /* Save the original element we check against. */
4020                 orig_mode = fsp->fsp_name->st.st_ex_mode;
4021
4022                 /* If we successfully chowned, we know we must
4023                  * be able to set the acl, so do it as root.
4024                  */
4025                 set_acl_as_root = true;
4026         }
4027
4028         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
4029
4030         if((security_info_sent & SECINFO_DACL) &&
4031                         (psd->type & SEC_DESC_DACL_PRESENT) &&
4032                         (psd->dacl == NULL)) {
4033                 struct security_ace ace[3];
4034
4035                 /* We can't have NULL DACL in POSIX.
4036                    Use owner/group/Everyone -> full access. */
4037
4038                 init_sec_ace(&ace[0],
4039                                 &file_owner_sid,
4040                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4041                                 GENERIC_ALL_ACCESS,
4042                                 0);
4043                 init_sec_ace(&ace[1],
4044                                 &file_grp_sid,
4045                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4046                                 GENERIC_ALL_ACCESS,
4047                                 0);
4048                 init_sec_ace(&ace[2],
4049                                 &global_sid_World,
4050                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
4051                                 GENERIC_ALL_ACCESS,
4052                                 0);
4053                 psd->dacl = make_sec_acl(talloc_tos(),
4054                                         NT4_ACL_REVISION,
4055                                         3,
4056                                         ace);
4057                 if (psd->dacl == NULL) {
4058                         return NT_STATUS_NO_MEMORY;
4059                 }
4060                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
4061         }
4062
4063         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
4064                                      &file_grp_sid, &file_ace_list,
4065                                      &dir_ace_list, security_info_sent, psd);
4066
4067         /* Ignore W2K traverse DACL set. */
4068         if (!file_ace_list && !dir_ace_list) {
4069                 return NT_STATUS_OK;
4070         }
4071
4072         if (!acl_perms) {
4073                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
4074                 free_canon_ace_list(file_ace_list);
4075                 free_canon_ace_list(dir_ace_list);
4076                 return NT_STATUS_ACCESS_DENIED;
4077         }
4078
4079         /*
4080          * Only change security if we got a DACL.
4081          */
4082
4083         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
4084                 free_canon_ace_list(file_ace_list);
4085                 free_canon_ace_list(dir_ace_list);
4086                 return NT_STATUS_OK;
4087         }
4088
4089         /*
4090          * Try using the POSIX ACL set first. Fall back to chmod if
4091          * we have no ACL support on this filesystem.
4092          */
4093
4094         if (acl_perms && file_ace_list) {
4095                 if (set_acl_as_root) {
4096                         become_root();
4097                 }
4098                 ret = set_canon_ace_list(fsp, file_ace_list, false,
4099                                          &fsp->fsp_name->st, &acl_set_support);
4100                 if (set_acl_as_root) {
4101                         unbecome_root();
4102                 }
4103                 if (acl_set_support && ret == false) {
4104                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
4105                                  "%s (%s).\n", fsp_str_dbg(fsp),
4106                                  strerror(errno)));
4107                         free_canon_ace_list(file_ace_list);
4108                         free_canon_ace_list(dir_ace_list);
4109                         return map_nt_error_from_unix(errno);
4110                 }
4111         }
4112
4113         if (acl_perms && acl_set_support && fsp->is_directory) {
4114                 if (dir_ace_list) {
4115                         if (set_acl_as_root) {
4116                                 become_root();
4117                         }
4118                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
4119                                                  &fsp->fsp_name->st,
4120                                                  &acl_set_support);
4121                         if (set_acl_as_root) {
4122                                 unbecome_root();
4123                         }
4124                         if (ret == false) {
4125                                 DEBUG(3,("set_nt_acl: failed to set default "
4126                                          "acl on directory %s (%s).\n",
4127                                          fsp_str_dbg(fsp), strerror(errno)));
4128                                 free_canon_ace_list(file_ace_list);
4129                                 free_canon_ace_list(dir_ace_list);
4130                                 return map_nt_error_from_unix(errno);
4131                         }
4132                 } else {
4133                         int sret = -1;
4134
4135                         /*
4136                          * No default ACL - delete one if it exists.
4137                          */
4138
4139                         if (set_acl_as_root) {
4140                                 become_root();
4141                         }
4142                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4143                             fsp->fsp_name->base_name);
4144                         if (set_acl_as_root) {
4145                                 unbecome_root();
4146                         }
4147                         if (sret == -1) {
4148                                 if (acl_group_override(conn, fsp->fsp_name)) {
4149                                         DEBUG(5,("set_nt_acl: acl group "
4150                                                  "control on and current user "
4151                                                  "in file %s primary group. "
4152                                                  "Override delete_def_acl\n",
4153                                                  fsp_str_dbg(fsp)));
4154
4155                                         become_root();
4156                                         sret =
4157                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4158                                                     conn,
4159                                                     fsp->fsp_name->base_name);
4160                                         unbecome_root();
4161                                 }
4162
4163                                 if (sret == -1) {
4164                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4165                                         free_canon_ace_list(file_ace_list);
4166                                         free_canon_ace_list(dir_ace_list);
4167                                         return map_nt_error_from_unix(errno);
4168                                 }
4169                         }
4170                 }
4171         }
4172
4173         if (acl_set_support) {
4174                 if (set_acl_as_root) {
4175                         become_root();
4176                 }
4177                 store_inheritance_attributes(fsp,
4178                                 file_ace_list,
4179                                 dir_ace_list,
4180                                 psd->type);
4181                 if (set_acl_as_root) {
4182                         unbecome_root();
4183                 }
4184         }
4185
4186         /*
4187          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4188          */
4189
4190         if(!acl_set_support && acl_perms) {
4191                 mode_t posix_perms;
4192
4193                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4194                         free_canon_ace_list(file_ace_list);
4195                         free_canon_ace_list(dir_ace_list);
4196                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4197                                  "posix permissions for file %s.\n",
4198                                  fsp_str_dbg(fsp)));
4199                         return NT_STATUS_ACCESS_DENIED;
4200                 }
4201
4202                 if (orig_mode != posix_perms) {
4203                         int sret = -1;
4204
4205                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4206                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4207
4208                         if (set_acl_as_root) {
4209                                 become_root();
4210                         }
4211                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4212                                              posix_perms);
4213                         if (set_acl_as_root) {
4214                                 unbecome_root();
4215                         }
4216                         if(sret == -1) {
4217                                 if (acl_group_override(conn, fsp->fsp_name)) {
4218                                         DEBUG(5,("set_nt_acl: acl group "
4219                                                  "control on and current user "
4220                                                  "in file %s primary group. "
4221                                                  "Override chmod\n",
4222                                                  fsp_str_dbg(fsp)));
4223
4224                                         become_root();
4225                                         sret = SMB_VFS_CHMOD(conn,
4226                                             fsp->fsp_name->base_name,
4227                                             posix_perms);
4228                                         unbecome_root();
4229                                 }
4230
4231                                 if (sret == -1) {
4232                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4233                                                  "failed. Error = %s.\n",
4234                                                  fsp_str_dbg(fsp),
4235                                                  (unsigned int)posix_perms,
4236                                                  strerror(errno)));
4237                                         free_canon_ace_list(file_ace_list);
4238                                         free_canon_ace_list(dir_ace_list);
4239                                         return map_nt_error_from_unix(errno);
4240                                 }
4241                         }
4242                 }
4243         }
4244
4245         free_canon_ace_list(file_ace_list);
4246         free_canon_ace_list(dir_ace_list);
4247
4248         /* Ensure the stat struct in the fsp is correct. */
4249         status = vfs_stat_fsp(fsp);
4250
4251         return NT_STATUS_OK;
4252 }
4253
4254 /****************************************************************************
4255  Get the actual group bits stored on a file with an ACL. Has no effect if
4256  the file has no ACL. Needed in dosmode code where the stat() will return
4257  the mask bits, not the real group bits, for a file with an ACL.
4258 ****************************************************************************/
4259
4260 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4261 {
4262         int entry_id = SMB_ACL_FIRST_ENTRY;
4263         SMB_ACL_ENTRY_T entry;
4264         SMB_ACL_T posix_acl;
4265         int result = -1;
4266
4267         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4268         if (posix_acl == (SMB_ACL_T)NULL)
4269                 return -1;
4270
4271         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4272                 SMB_ACL_TAG_T tagtype;
4273                 SMB_ACL_PERMSET_T permset;
4274
4275                 entry_id = SMB_ACL_NEXT_ENTRY;
4276
4277                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4278                         break;
4279
4280                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4281                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4282                                 break;
4283                         } else {
4284                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4285                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4286                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4287                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4288                                 result = 0;
4289                                 break;
4290                         }
4291                 }
4292         }
4293         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4294         return result;
4295 }
4296
4297 /****************************************************************************
4298  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4299  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4300 ****************************************************************************/
4301
4302 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4303 {
4304         int entry_id = SMB_ACL_FIRST_ENTRY;
4305         SMB_ACL_ENTRY_T entry;
4306         int num_entries = 0;
4307
4308         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4309                 SMB_ACL_TAG_T tagtype;
4310                 SMB_ACL_PERMSET_T permset;
4311                 mode_t perms;
4312
4313                 entry_id = SMB_ACL_NEXT_ENTRY;
4314
4315                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4316                         return -1;
4317
4318                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4319                         return -1;
4320
4321                 num_entries++;
4322
4323                 switch(tagtype) {
4324                         case SMB_ACL_USER_OBJ:
4325                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4326                                 break;
4327                         case SMB_ACL_GROUP_OBJ:
4328                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4329                                 break;
4330                         case SMB_ACL_MASK:
4331                                 /*
4332                                  * FIXME: The ACL_MASK entry permissions should really be set to
4333                                  * the union of the permissions of all ACL_USER,
4334                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4335                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4336                                  */
4337                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4338                                 break;
4339                         case SMB_ACL_OTHER:
4340                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4341                                 break;
4342                         default:
4343                                 continue;
4344                 }
4345
4346                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4347                         return -1;
4348
4349                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4350                         return -1;
4351         }
4352
4353         /*
4354          * If this is a simple 3 element ACL or no elements then it's a standard
4355          * UNIX permission set. Just use chmod...
4356          */
4357
4358         if ((num_entries == 3) || (num_entries == 0))
4359                 return -1;
4360
4361         return 0;
4362 }
4363
4364 /****************************************************************************
4365  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4366  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4367  resulting ACL on TO.  Note that name is in UNIX character set.
4368 ****************************************************************************/
4369
4370 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4371 {
4372         SMB_ACL_T posix_acl = NULL;
4373         int ret = -1;
4374
4375         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4376                 return -1;
4377
4378         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4379                 goto done;
4380
4381         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4382
4383  done:
4384
4385         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4386         return ret;
4387 }
4388
4389 /****************************************************************************
4390  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4391  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4392  Note that name is in UNIX character set.
4393 ****************************************************************************/
4394
4395 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4396 {
4397         return copy_access_posix_acl(conn, name, name, mode);
4398 }
4399
4400 /****************************************************************************
4401  Check for an existing default POSIX ACL on a directory.
4402 ****************************************************************************/
4403
4404 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4405 {
4406         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4407         bool has_acl = False;
4408         SMB_ACL_ENTRY_T entry;
4409
4410         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4411                 has_acl = True;
4412         }
4413
4414         if (def_acl) {
4415                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4416         }
4417         return has_acl;
4418 }
4419
4420 /****************************************************************************
4421  If the parent directory has no default ACL but it does have an Access ACL,
4422  inherit this Access ACL to file name.
4423 ****************************************************************************/
4424
4425 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4426                        const char *name, mode_t mode)
4427 {
4428         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4429                 return 0;
4430
4431         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4432 }
4433
4434 /****************************************************************************
4435  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4436  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4437 ****************************************************************************/
4438
4439 int fchmod_acl(files_struct *fsp, mode_t mode)
4440 {
4441         connection_struct *conn = fsp->conn;
4442         SMB_ACL_T posix_acl = NULL;
4443         int ret = -1;
4444
4445         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4446                 return -1;
4447
4448         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4449                 goto done;
4450
4451         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4452
4453   done:
4454
4455         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4456         return ret;
4457 }
4458
4459 /****************************************************************************
4460  Map from wire type to permset.
4461 ****************************************************************************/
4462
4463 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4464 {
4465         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4466                 return False;
4467         }
4468
4469         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4470                 return False;
4471         }
4472
4473         if (wire_perm & SMB_POSIX_ACL_READ) {
4474                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4475                         return False;
4476                 }
4477         }
4478         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4479                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4480                         return False;
4481                 }
4482         }
4483         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4484                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4485                         return False;
4486                 }
4487         }
4488         return True;
4489 }
4490
4491 /****************************************************************************
4492  Map from wire type to tagtype.
4493 ****************************************************************************/
4494
4495 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4496 {
4497         switch (wire_tt) {
4498                 case SMB_POSIX_ACL_USER_OBJ:
4499                         *p_tt = SMB_ACL_USER_OBJ;
4500                         break;
4501                 case SMB_POSIX_ACL_USER:
4502                         *p_tt = SMB_ACL_USER;
4503                         break;
4504                 case SMB_POSIX_ACL_GROUP_OBJ:
4505                         *p_tt = SMB_ACL_GROUP_OBJ;
4506                         break;
4507                 case SMB_POSIX_ACL_GROUP:
4508                         *p_tt = SMB_ACL_GROUP;
4509                         break;
4510                 case SMB_POSIX_ACL_MASK:
4511                         *p_tt = SMB_ACL_MASK;
4512                         break;
4513                 case SMB_POSIX_ACL_OTHER:
4514                         *p_tt = SMB_ACL_OTHER;
4515                         break;
4516                 default:
4517                         return False;
4518         }
4519         return True;
4520 }
4521
4522 /****************************************************************************
4523  Create a new POSIX acl from wire permissions.
4524  FIXME ! How does the share mask/mode fit into this.... ?
4525 ****************************************************************************/
4526
4527 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4528 {
4529         unsigned int i;
4530         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4531
4532         if (the_acl == NULL) {
4533                 return NULL;
4534         }
4535
4536         for (i = 0; i < num_acls; i++) {
4537                 SMB_ACL_ENTRY_T the_entry;
4538                 SMB_ACL_PERMSET_T the_permset;
4539                 SMB_ACL_TAG_T tag_type;
4540
4541                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4542                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4543                                 i, strerror(errno) ));
4544                         goto fail;
4545                 }
4546
4547                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4548                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4549                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4550                         goto fail;
4551                 }
4552
4553                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4554                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4555                                 i, strerror(errno) ));
4556                         goto fail;
4557                 }
4558
4559                 /* Get the permset pointer from the new ACL entry. */
4560                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4561                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4562                                 i, strerror(errno) ));
4563                         goto fail;
4564                 }
4565
4566                 /* Map from wire to permissions. */
4567                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4568                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4569                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4570                         goto fail;
4571                 }
4572
4573                 /* Now apply to the new ACL entry. */
4574                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4575                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4576                                 i, strerror(errno) ));
4577                         goto fail;
4578                 }
4579
4580                 if (tag_type == SMB_ACL_USER) {
4581                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4582                         uid_t uid = (uid_t)uidval;
4583                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4584                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4585                                         (unsigned int)uid, i, strerror(errno) ));
4586                                 goto fail;
4587                         }
4588                 }
4589
4590                 if (tag_type == SMB_ACL_GROUP) {
4591                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4592                         gid_t gid = (uid_t)gidval;
4593                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4594                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4595                                         (unsigned int)gid, i, strerror(errno) ));
4596                                 goto fail;
4597                         }
4598                 }
4599         }
4600
4601         return the_acl;
4602
4603  fail:
4604
4605         if (the_acl != NULL) {
4606                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4607         }
4608         return NULL;
4609 }
4610
4611 /****************************************************************************
4612  Calls from UNIX extensions - Default POSIX ACL set.
4613  If num_def_acls == 0 and not a directory just return. If it is a directory
4614  and num_def_acls == 0 then remove the default acl. Else set the default acl
4615  on the directory.
4616 ****************************************************************************/
4617
4618 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4619                                 uint16 num_def_acls, const char *pdata)
4620 {
4621         SMB_ACL_T def_acl = NULL;
4622
4623         if (!S_ISDIR(psbuf->st_ex_mode)) {
4624                 if (num_def_acls) {
4625                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4626                         errno = EISDIR;
4627                         return False;
4628                 } else {
4629                         return True;
4630                 }
4631         }
4632
4633         if (!num_def_acls) {
4634                 /* Remove the default ACL. */
4635                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4636                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4637                                 fname, strerror(errno) ));
4638                         return False;
4639                 }
4640                 return True;
4641         }
4642
4643         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4644                 return False;
4645         }
4646
4647         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4648                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4649                         fname, strerror(errno) ));
4650                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4651                 return False;
4652         }
4653
4654         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4655         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4656         return True;
4657 }
4658
4659 /****************************************************************************
4660  Remove an ACL from a file. As we don't have acl_delete_entry() available
4661  we must read the current acl and copy all entries except MASK, USER and GROUP
4662  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4663  removed.
4664  FIXME ! How does the share mask/mode fit into this.... ?
4665 ****************************************************************************/
4666
4667 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4668 {
4669         SMB_ACL_T file_acl = NULL;
4670         int entry_id = SMB_ACL_FIRST_ENTRY;
4671         SMB_ACL_ENTRY_T entry;
4672         bool ret = False;
4673         /* Create a new ACL with only 3 entries, u/g/w. */
4674         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4675         SMB_ACL_ENTRY_T user_ent = NULL;
4676         SMB_ACL_ENTRY_T group_ent = NULL;
4677         SMB_ACL_ENTRY_T other_ent = NULL;
4678
4679         if (new_file_acl == NULL) {
4680                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4681                 return False;
4682         }
4683
4684         /* Now create the u/g/w entries. */
4685         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4686                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4687                         fname, strerror(errno) ));
4688                 goto done;
4689         }
4690         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4691                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4692                         fname, strerror(errno) ));
4693                 goto done;
4694         }
4695
4696         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4697                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4698                         fname, strerror(errno) ));
4699                 goto done;
4700         }
4701         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4702                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4703                         fname, strerror(errno) ));
4704                 goto done;
4705         }
4706
4707         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4708                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4709                         fname, strerror(errno) ));
4710                 goto done;
4711         }
4712         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4713                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4714                         fname, strerror(errno) ));
4715                 goto done;
4716         }
4717
4718         /* Get the current file ACL. */
4719         if (fsp && fsp->fh->fd != -1) {
4720                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4721         } else {
4722                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4723         }
4724
4725         if (file_acl == NULL) {
4726                 /* This is only returned if an error occurred. Even for a file with
4727                    no acl a u/g/w acl should be returned. */
4728                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4729                         fname, strerror(errno) ));
4730                 goto done;
4731         }
4732
4733         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4734                 SMB_ACL_TAG_T tagtype;
4735                 SMB_ACL_PERMSET_T permset;
4736
4737                 entry_id = SMB_ACL_NEXT_ENTRY;
4738
4739                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4740                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4741                                 fname, strerror(errno) ));
4742                         goto done;
4743                 }
4744
4745                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4746                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4747                                 fname, strerror(errno) ));
4748                         goto done;
4749                 }
4750
4751                 if (tagtype == SMB_ACL_USER_OBJ) {
4752                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4753                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4754                                         fname, strerror(errno) ));
4755                         }
4756                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4757                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4758                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4759                                         fname, strerror(errno) ));
4760                         }
4761                 } else if (tagtype == SMB_ACL_OTHER) {
4762                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4763                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4764                                         fname, strerror(errno) ));
4765                         }
4766                 }
4767         }
4768
4769         /* Set the new empty file ACL. */
4770         if (fsp && fsp->fh->fd != -1) {
4771                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4772                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4773                                 fname, strerror(errno) ));
4774                         goto done;
4775                 }
4776         } else {
4777                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4778                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4779                                 fname, strerror(errno) ));
4780                         goto done;
4781                 }
4782         }
4783
4784         ret = True;
4785
4786  done:
4787
4788         if (file_acl) {
4789                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4790         }
4791         if (new_file_acl) {
4792                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4793         }
4794         return ret;
4795 }
4796
4797 /****************************************************************************
4798  Calls from UNIX extensions - POSIX ACL set.
4799  If num_def_acls == 0 then read/modify/write acl after removing all entries
4800  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4801 ****************************************************************************/
4802
4803 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4804 {
4805         SMB_ACL_T file_acl = NULL;
4806
4807         if (!num_acls) {
4808                 /* Remove the ACL from the file. */
4809                 return remove_posix_acl(conn, fsp, fname);
4810         }
4811
4812         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4813                 return False;
4814         }
4815
4816         if (fsp && fsp->fh->fd != -1) {
4817                 /* The preferred way - use an open fd. */
4818                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4819                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4820                                 fname, strerror(errno) ));
4821                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4822                         return False;
4823                 }
4824         } else {
4825                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4826                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4827                                 fname, strerror(errno) ));
4828                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4829                         return False;
4830                 }
4831         }
4832
4833         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4834         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4835         return True;
4836 }
4837
4838 /********************************************************************
4839  Pull the NT ACL from a file on disk or the OpenEventlog() access
4840  check.  Caller is responsible for freeing the returned security
4841  descriptor via TALLOC_FREE().  This is designed for dealing with
4842  user space access checks in smbd outside of the VFS.  For example,
4843  checking access rights in OpenEventlog().
4844
4845  Assume we are dealing with files (for now)
4846 ********************************************************************/
4847
4848 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4849 {
4850         struct security_descriptor *psd, *ret_sd;
4851         connection_struct *conn;
4852         files_struct finfo;
4853         struct fd_handle fh;
4854         NTSTATUS status;
4855
4856         conn = talloc_zero(ctx, connection_struct);
4857         if (conn == NULL) {
4858                 DEBUG(0, ("talloc failed\n"));
4859                 return NULL;
4860         }
4861
4862         if (!(conn->params = talloc(conn, struct share_params))) {
4863                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4864                 TALLOC_FREE(conn);
4865                 return NULL;
4866         }
4867
4868         conn->params->service = -1;
4869
4870         set_conn_connectpath(conn, "/");
4871
4872         if (!smbd_vfs_init(conn)) {
4873                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4874                 conn_free(conn);
4875                 return NULL;
4876         }
4877
4878         ZERO_STRUCT( finfo );
4879         ZERO_STRUCT( fh );
4880
4881         finfo.fnum = FNUM_FIELD_INVALID;
4882         finfo.conn = conn;
4883         finfo.fh = &fh;
4884         finfo.fh->fd = -1;
4885
4886         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4887                                             &finfo.fsp_name);
4888         if (!NT_STATUS_IS_OK(status)) {
4889                 conn_free(conn);
4890                 return NULL;
4891         }
4892
4893         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4894                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4895                 TALLOC_FREE(finfo.fsp_name);
4896                 conn_free(conn);
4897                 return NULL;
4898         }
4899
4900         ret_sd = dup_sec_desc( ctx, psd );
4901
4902         TALLOC_FREE(finfo.fsp_name);
4903         conn_free(conn);
4904
4905         return ret_sd;
4906 }
4907
4908 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4909
4910 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4911                                         const char *name,
4912                                         SMB_STRUCT_STAT *psbuf,
4913                                         struct security_descriptor **ppdesc)
4914 {
4915         struct dom_sid owner_sid, group_sid;
4916         size_t size = 0;
4917         struct security_ace aces[4];
4918         uint32_t access_mask = 0;
4919         mode_t mode = psbuf->st_ex_mode;
4920         struct security_acl *new_dacl = NULL;
4921         int idx = 0;
4922
4923         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4924                 name, (int)mode ));
4925
4926         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4927         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4928
4929         /*
4930          We provide up to 4 ACEs
4931                 - Owner
4932                 - Group
4933                 - Everyone
4934                 - NT System
4935         */
4936
4937         if (mode & S_IRUSR) {
4938                 if (mode & S_IWUSR) {
4939                         access_mask |= SEC_RIGHTS_FILE_ALL;
4940                 } else {
4941                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4942                 }
4943         }
4944         if (mode & S_IWUSR) {
4945                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4946         }
4947
4948         init_sec_ace(&aces[idx],
4949                         &owner_sid,
4950                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4951                         access_mask,
4952                         0);
4953         idx++;
4954
4955         access_mask = 0;
4956         if (mode & S_IRGRP) {
4957                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4958         }
4959         if (mode & S_IWGRP) {
4960                 /* note that delete is not granted - this matches posix behaviour */
4961                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4962         }
4963         if (access_mask) {
4964                 init_sec_ace(&aces[idx],
4965                         &group_sid,
4966                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4967                         access_mask,
4968                         0);
4969                 idx++;
4970         }
4971
4972         access_mask = 0;
4973         if (mode & S_IROTH) {
4974                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4975         }
4976         if (mode & S_IWOTH) {
4977                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4978         }
4979         if (access_mask) {
4980                 init_sec_ace(&aces[idx],
4981                         &global_sid_World,
4982                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4983                         access_mask,
4984                         0);
4985                 idx++;
4986         }
4987
4988         init_sec_ace(&aces[idx],
4989                         &global_sid_System,
4990                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4991                         SEC_RIGHTS_FILE_ALL,
4992                         0);
4993         idx++;
4994
4995         new_dacl = make_sec_acl(ctx,
4996                         NT4_ACL_REVISION,
4997                         idx,
4998                         aces);
4999
5000         if (!new_dacl) {
5001                 return NT_STATUS_NO_MEMORY;
5002         }
5003
5004         *ppdesc = make_sec_desc(ctx,
5005                         SECURITY_DESCRIPTOR_REVISION_1,
5006                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
5007                         &owner_sid,
5008                         &group_sid,
5009                         NULL,
5010                         new_dacl,
5011                         &size);
5012         if (!*ppdesc) {
5013                 return NT_STATUS_NO_MEMORY;
5014         }
5015         return NT_STATUS_OK;
5016 }