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
  24 extern struct current_user current_user;
  25 extern const struct generic_mapping file_generic_mapping;
  26
  27 #undef  DBGC_CLASS
  28 #define DBGC_CLASS DBGC_ACLS
  29
  30 /****************************************************************************
  31  Data structures representing the internal ACE format.
  32 ****************************************************************************/
  33
  34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  36
  37 typedef union posix_id {
  38                 uid_t uid;
  39                 gid_t gid;
  40                 int world;
  41 } posix_id;
  42
  43 typedef struct canon_ace {
  44         struct canon_ace *next, *prev;
  45         SMB_ACL_TAG_T type;
  46         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  47         DOM_SID trustee;
  48         enum ace_owner owner_type;
  49         enum ace_attribute attr;
  50         posix_id unix_ug;
  51         uint8_t ace_flags; /* From windows ACE entry. */
  52 } canon_ace;
  53
  54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  55
  56 /*
  57  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  58  * attribute on disk - version 1.
  59  * All values are little endian.
  60  *
  61  * |  1   |  1   |   2         |         2           |  ....
  62  * +------+------+-------------+---------------------+-------------+--------------------+
  63  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  64  * +------+------+-------------+---------------------+-------------+--------------------+
  65  *
  66  * Entry format is :
  67  *
  68  * |  1   |       4           |
  69  * +------+-------------------+
  70  * | value|  uid/gid or world |
  71  * | type |  value            |
  72  * +------+-------------------+
  73  *
  74  * Version 2 format. Stores extra Windows metadata about an ACL.
  75  *
  76  * |  1   |  2       |   2         |         2           |  ....
  77  * +------+----------+-------------+---------------------+-------------+--------------------+
  78  * | vers | ace      | num_entries | num_default_entries | ..entries.. | default_entries... |
  79  * |   2  |  type    |             |                     |             |                    |
  80  * +------+----------+-------------+---------------------+-------------+--------------------+
  81  *
  82  * Entry format is :
  83  *
  84  * |  1   |  1   |       4           |
  85  * +------+------+-------------------+
  86  * | ace  | value|  uid/gid or world |
  87  * | flag | type |  value            |
  88  * +------+-------------------+------+
  89  *
  90  */
  91
  92 #define PAI_VERSION_OFFSET                      0
  93
  94 #define PAI_V1_FLAG_OFFSET                      1
  95 #define PAI_V1_NUM_ENTRIES_OFFSET               2
  96 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET       4
  97 #define PAI_V1_ENTRIES_BASE                     6
  98 #define PAI_V1_ACL_FLAG_PROTECTED               0x1
  99 #define PAI_V1_ENTRY_LENGTH                     5
 100
 101 #define PAI_V1_VERSION                          1
 102
 103 #define PAI_V2_TYPE_OFFSET                      1
 104 #define PAI_V2_NUM_ENTRIES_OFFSET               3
 105 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET       5
 106 #define PAI_V2_ENTRIES_BASE                     7
 107 #define PAI_V2_ENTRY_LENGTH                     6
 108
 109 #define PAI_V2_VERSION                          2
 110
 111 /*
 112  * In memory format of user.SAMBA_PAI attribute.
 113  */
 114
 115 struct pai_entry {
 116         struct pai_entry *next, *prev;
 117         uint8_t ace_flags;
 118         enum ace_owner owner_type;
 119         posix_id unix_ug;
 120 };
 121
 122 struct pai_val {
 123         uint16_t sd_type;
 124         unsigned int num_entries;
 125         struct pai_entry *entry_list;
 126         unsigned int num_def_entries;
 127         struct pai_entry *def_entry_list;
 128 };
 129
 130 /************************************************************************
 131  Return a uint32 of the pai_entry principal.
 132 ************************************************************************/
 133
 134 static uint32_t get_pai_entry_val(struct pai_entry *paie)
 135 {
 136         switch (paie->owner_type) {
 137                 case UID_ACE:
 138                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 139                         return (uint32_t)paie->unix_ug.uid;
 140                 case GID_ACE:
 141                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 142                         return (uint32_t)paie->unix_ug.gid;
 143                 case WORLD_ACE:
 144                 default:
 145                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 146                         return (uint32_t)-1;
 147         }
 148 }
 149
 150 /************************************************************************
 151  Return a uint32 of the entry principal.
 152 ************************************************************************/
 153
 154 static uint32_t get_entry_val(canon_ace *ace_entry)
 155 {
 156         switch (ace_entry->owner_type) {
 157                 case UID_ACE:
 158                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
 159                         return (uint32_t)ace_entry->unix_ug.uid;
 160                 case GID_ACE:
 161                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
 162                         return (uint32_t)ace_entry->unix_ug.gid;
 163                 case WORLD_ACE:
 164                 default:
 165                         DEBUG(10,("get_entry_val: world ace\n"));
 166                         return (uint32_t)-1;
 167         }
 168 }
 169
 170 /************************************************************************
 171  Create the on-disk format (always v2 now). Caller must free.
 172 ************************************************************************/
 173
 174 static char *create_pai_buf_v2(canon_ace *file_ace_list,
 175                                 canon_ace *dir_ace_list,
 176                                 uint16_t sd_type,
 177                                 size_t *store_size)
 178 {
 179         char *pai_buf = NULL;
 180         canon_ace *ace_list = NULL;
 181         char *entry_offset = NULL;
 182         unsigned int num_entries = 0;
 183         unsigned int num_def_entries = 0;
 184
 185         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 186                 num_entries++;
 187         }
 188
 189         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 190                 num_def_entries++;
 191         }
 192
 193         DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 194
 195         *store_size = PAI_V2_ENTRIES_BASE +
 196                 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
 197
 198         pai_buf = (char *)SMB_MALLOC(*store_size);
 199         if (!pai_buf) {
 200                 return NULL;
 201         }
 202
 203         /* Set up the header. */
 204         memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
 205         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
 206         SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
 207         SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
 208         SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 209
 210         entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
 211
 212         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 213                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 214                 uint32_t entry_val = get_entry_val(ace_list);
 215
 216                 SCVAL(entry_offset,0,ace_list->ace_flags);
 217                 SCVAL(entry_offset,1,type_val);
 218                 SIVAL(entry_offset,2,entry_val);
 219                 entry_offset += PAI_V2_ENTRY_LENGTH;
 220         }
 221
 222         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 223                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 224                 uint32_t entry_val = get_entry_val(ace_list);
 225
 226                 SCVAL(entry_offset,0,ace_list->ace_flags);
 227                 SCVAL(entry_offset,1,type_val);
 228                 SIVAL(entry_offset,2,entry_val);
 229                 entry_offset += PAI_V2_ENTRY_LENGTH;
 230         }
 231
 232         return pai_buf;
 233 }
 234
 235 /************************************************************************
 236  Store the user.SAMBA_PAI attribute on disk.
 237 ************************************************************************/
 238
 239 static void store_inheritance_attributes(files_struct *fsp,
 240                                         canon_ace *file_ace_list,
 241                                         canon_ace *dir_ace_list,
 242                                         uint16_t sd_type)
 243 {
 244         int ret;
 245         size_t store_size;
 246         char *pai_buf;
 247
 248         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 249                 return;
 250         }
 251
 252         pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
 253                                 sd_type, &store_size);
 254
 255         if (fsp->fh->fd != -1) {
 256                 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 257                                 pai_buf, store_size, 0);
 258         } else {
 259                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
 260                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 261                                        pai_buf, store_size, 0);
 262         }
 263
 264         SAFE_FREE(pai_buf);
 265
 266         DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
 267                 (unsigned int)sd_type,
 268                 fsp_str_dbg(fsp)));
 269
 270         if (ret == -1 && !no_acl_syscall_error(errno)) {
 271                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 272         }
 273 }
 274
 275 /************************************************************************
 276  Delete the in memory inheritance info.
 277 ************************************************************************/
 278
 279 static void free_inherited_info(struct pai_val *pal)
 280 {
 281         if (pal) {
 282                 struct pai_entry *paie, *paie_next;
 283                 for (paie = pal->entry_list; paie; paie = paie_next) {
 284                         paie_next = paie->next;
 285                         SAFE_FREE(paie);
 286                 }
 287                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 288                         paie_next = paie->next;
 289                         SAFE_FREE(paie);
 290                 }
 291                 SAFE_FREE(pal);
 292         }
 293 }
 294
 295 /************************************************************************
 296  Get any stored ACE flags.
 297 ************************************************************************/
 298
 299 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
 300 {
 301         struct pai_entry *paie;
 302
 303         if (!pal) {
 304                 return 0;
 305         }
 306
 307         /* If the entry exists it is inherited. */
 308         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 309                 if (ace_entry->owner_type == paie->owner_type &&
 310                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 311                         return paie->ace_flags;
 312         }
 313         return 0;
 314 }
 315
 316 /************************************************************************
 317  Ensure an attribute just read is valid - v1.
 318 ************************************************************************/
 319
 320 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
 321 {
 322         uint16 num_entries;
 323         uint16 num_def_entries;
 324
 325         if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
 326                 /* Corrupted - too small. */
 327                 return false;
 328         }
 329
 330         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
 331                 return false;
 332         }
 333
 334         num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
 335         num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 336
 337         /* Check the entry lists match. */
 338         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 339
 340         if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
 341                         PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
 342                 return false;
 343         }
 344
 345         return true;
 346 }
 347
 348 /************************************************************************
 349  Ensure an attribute just read is valid - v2.
 350 ************************************************************************/
 351
 352 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
 353 {
 354         uint16 num_entries;
 355         uint16 num_def_entries;
 356
 357         if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
 358                 /* Corrupted - too small. */
 359                 return false;
 360         }
 361
 362         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
 363                 return false;
 364         }
 365
 366         num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
 367         num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 368
 369         /* Check the entry lists match. */
 370         /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
 371
 372         if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
 373                         PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
 374                 return false;
 375         }
 376
 377         return true;
 378 }
 379
 380 /************************************************************************
 381  Decode the owner.
 382 ************************************************************************/
 383
 384 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
 385 {
 386         paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 387         switch( paie->owner_type) {
 388                 case UID_ACE:
 389                         paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 390                         DEBUG(10,("get_pai_owner_type: uid = %u\n",
 391                                 (unsigned int)paie->unix_ug.uid ));
 392                         break;
 393                 case GID_ACE:
 394                         paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 395                         DEBUG(10,("get_pai_owner_type: gid = %u\n",
 396                                 (unsigned int)paie->unix_ug.gid ));
 397                         break;
 398                 case WORLD_ACE:
 399                         paie->unix_ug.world = -1;
 400                         DEBUG(10,("get_pai_owner_type: world ace\n"));
 401                         break;
 402                 default:
 403                         return false;
 404         }
 405         return true;
 406 }
 407
 408 /************************************************************************
 409  Process v2 entries.
 410 ************************************************************************/
 411
 412 static const char *create_pai_v1_entries(struct pai_val *paiv,
 413                                 const char *entry_offset,
 414                                 bool def_entry)
 415 {
 416         int i;
 417
 418         for (i = 0; i < paiv->num_entries; i++) {
 419                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 420                 if (!paie) {
 421                         return NULL;
 422                 }
 423
 424                 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
 425                 if (!get_pai_owner_type(paie, entry_offset)) {
 426                         return NULL;
 427                 }
 428
 429                 if (!def_entry) {
 430                         DLIST_ADD(paiv->entry_list, paie);
 431                 } else {
 432                         DLIST_ADD(paiv->def_entry_list, paie);
 433                 }
 434                 entry_offset += PAI_V1_ENTRY_LENGTH;
 435         }
 436         return entry_offset;
 437 }
 438
 439 /************************************************************************
 440  Convert to in-memory format from version 1.
 441 ************************************************************************/
 442
 443 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
 444 {
 445         const char *entry_offset;
 446         struct pai_val *paiv = NULL;
 447
 448         if (!check_pai_ok_v1(buf, size)) {
 449                 return NULL;
 450         }
 451
 452         paiv = SMB_MALLOC_P(struct pai_val);
 453         if (!paiv) {
 454                 return NULL;
 455         }
 456
 457         memset(paiv, '\0', sizeof(struct pai_val));
 458
 459         paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
 460                         SE_DESC_DACL_PROTECTED : 0;
 461
 462         paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
 463         paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 464
 465         entry_offset = buf + PAI_V1_ENTRIES_BASE;
 466
 467         DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
 468                         paiv->num_entries, paiv->num_def_entries ));
 469
 470         entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
 471         if (entry_offset == NULL) {
 472                 free_inherited_info(paiv);
 473                 return NULL;
 474         }
 475         entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
 476         if (entry_offset == NULL) {
 477                 free_inherited_info(paiv);
 478                 return NULL;
 479         }
 480
 481         return paiv;
 482 }
 483
 484 /************************************************************************
 485  Process v2 entries.
 486 ************************************************************************/
 487
 488 static const char *create_pai_v2_entries(struct pai_val *paiv,
 489                                 const char *entry_offset,
 490                                 bool def_entry)
 491 {
 492         int i;
 493
 494         for (i = 0; i < paiv->num_entries; i++) {
 495                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 496                 if (!paie) {
 497                         return NULL;
 498                 }
 499
 500                 paie->ace_flags = CVAL(entry_offset,0);
 501
 502                 entry_offset++;
 503
 504                 if (!get_pai_owner_type(paie, entry_offset)) {
 505                         return NULL;
 506                 }
 507                 if (!def_entry) {
 508                         DLIST_ADD(paiv->entry_list, paie);
 509                 } else {
 510                         DLIST_ADD(paiv->def_entry_list, paie);
 511                 }
 512                 entry_offset += PAI_V2_ENTRY_LENGTH;
 513         }
 514         return entry_offset;
 515 }
 516
 517 /************************************************************************
 518  Convert to in-memory format from version 2.
 519 ************************************************************************/
 520
 521 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
 522 {
 523         const char *entry_offset;
 524         struct pai_val *paiv = NULL;
 525
 526         if (!check_pai_ok_v2(buf, size)) {
 527                 return NULL;
 528         }
 529
 530         paiv = SMB_MALLOC_P(struct pai_val);
 531         if (!paiv) {
 532                 return NULL;
 533         }
 534
 535         memset(paiv, '\0', sizeof(struct pai_val));
 536
 537         paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
 538
 539         paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
 540         paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 541
 542         entry_offset = buf + PAI_V2_ENTRIES_BASE;
 543
 544         DEBUG(10,("create_pai_val_v2: num_entries = %u, num_def_entries = %u\n",
 545                         paiv->num_entries, paiv->num_def_entries ));
 546
 547         entry_offset = create_pai_v2_entries(paiv, entry_offset, false);
 548         if (entry_offset == NULL) {
 549                 free_inherited_info(paiv);
 550                 return NULL;
 551         }
 552         entry_offset = create_pai_v2_entries(paiv, entry_offset, true);
 553         if (entry_offset == NULL) {
 554                 free_inherited_info(paiv);
 555                 return NULL;
 556         }
 557
 558         return paiv;
 559 }
 560
 561 /************************************************************************
 562  Convert to in-memory format - from either version 1 or 2.
 563 ************************************************************************/
 564
 565 static struct pai_val *create_pai_val(const char *buf, size_t size)
 566 {
 567         if (size < 1) {
 568                 return NULL;
 569         }
 570         if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
 571                 return create_pai_val_v1(buf, size);
 572         } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
 573                 return create_pai_val_v2(buf, size);
 574         } else {
 575                 return NULL;
 576         }
 577 }
 578
 579 /************************************************************************
 580  Load the user.SAMBA_PAI attribute.
 581 ************************************************************************/
 582
 583 static struct pai_val *fload_inherited_info(files_struct *fsp)
 584 {
 585         char *pai_buf;
 586         size_t pai_buf_size = 1024;
 587         struct pai_val *paiv = NULL;
 588         ssize_t ret;
 589
 590         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 591                 return NULL;
 592         }
 593
 594         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 595                 return NULL;
 596         }
 597
 598         do {
 599                 if (fsp->fh->fd != -1) {
 600                         ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 601                                         pai_buf, pai_buf_size);
 602                 } else {
 603                         ret = SMB_VFS_GETXATTR(fsp->conn,
 604                                                fsp->fsp_name->base_name,
 605                                                SAMBA_POSIX_INHERITANCE_EA_NAME,
 606                                                pai_buf, pai_buf_size);
 607                 }
 608
 609                 if (ret == -1) {
 610                         if (errno != ERANGE) {
 611                                 break;
 612                         }
 613                         /* Buffer too small - enlarge it. */
 614                         pai_buf_size *= 2;
 615                         SAFE_FREE(pai_buf);
 616                         if (pai_buf_size > 1024*1024) {
 617                                 return NULL; /* Limit malloc to 1mb. */
 618                         }
 619                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 620                                 return NULL;
 621                 }
 622         } while (ret == -1);
 623
 624         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
 625                   (unsigned long)ret, fsp_str_dbg(fsp)));
 626
 627         if (ret == -1) {
 628                 /* No attribute or not supported. */
 629 #if defined(ENOATTR)
 630                 if (errno != ENOATTR)
 631                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 632 #else
 633                 if (errno != ENOSYS)
 634                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 635 #endif
 636                 SAFE_FREE(pai_buf);
 637                 return NULL;
 638         }
 639
 640         paiv = create_pai_val(pai_buf, ret);
 641
 642         if (paiv) {
 643                 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
 644                           (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
 645         }
 646
 647         SAFE_FREE(pai_buf);
 648         return paiv;
 649 }
 650
 651 /************************************************************************
 652  Load the user.SAMBA_PAI attribute.
 653 ************************************************************************/
 654
 655 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
 656                                            const char *fname)
 657 {
 658         char *pai_buf;
 659         size_t pai_buf_size = 1024;
 660         struct pai_val *paiv = NULL;
 661         ssize_t ret;
 662
 663         if (!lp_map_acl_inherit(SNUM(conn))) {
 664                 return NULL;
 665         }
 666
 667         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 668                 return NULL;
 669         }
 670
 671         do {
 672                 ret = SMB_VFS_GETXATTR(conn, fname,
 673                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 674                                        pai_buf, pai_buf_size);
 675
 676                 if (ret == -1) {
 677                         if (errno != ERANGE) {
 678                                 break;
 679                         }
 680                         /* Buffer too small - enlarge it. */
 681                         pai_buf_size *= 2;
 682                         SAFE_FREE(pai_buf);
 683                         if (pai_buf_size > 1024*1024) {
 684                                 return NULL; /* Limit malloc to 1mb. */
 685                         }
 686                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 687                                 return NULL;
 688                 }
 689         } while (ret == -1);
 690
 691         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
 692
 693         if (ret == -1) {
 694                 /* No attribute or not supported. */
 695 #if defined(ENOATTR)
 696                 if (errno != ENOATTR)
 697                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 698 #else
 699                 if (errno != ENOSYS)
 700                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 701 #endif
 702                 SAFE_FREE(pai_buf);
 703                 return NULL;
 704         }
 705
 706         paiv = create_pai_val(pai_buf, ret);
 707
 708         if (paiv) {
 709                 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
 710                         (unsigned int)paiv->sd_type,
 711                         fname));
 712         }
 713
 714         SAFE_FREE(pai_buf);
 715         return paiv;
 716 }
 717
 718 /****************************************************************************
 719  Functions to manipulate the internal ACE format.
 720 ****************************************************************************/
 721
 722 /****************************************************************************
 723  Count a linked list of canonical ACE entries.
 724 ****************************************************************************/
 725
 726 static size_t count_canon_ace_list( canon_ace *l_head )
 727 {
 728         size_t count = 0;
 729         canon_ace *ace;
 730
 731         for (ace = l_head; ace; ace = ace->next)
 732                 count++;
 733
 734         return count;
 735 }
 736
 737 /****************************************************************************
 738  Free a linked list of canonical ACE entries.
 739 ****************************************************************************/
 740
 741 static void free_canon_ace_list( canon_ace *l_head )
 742 {
 743         canon_ace *list, *next;
 744
 745         for (list = l_head; list; list = next) {
 746                 next = list->next;
 747                 DLIST_REMOVE(l_head, list);
 748                 SAFE_FREE(list);
 749         }
 750 }
 751
 752 /****************************************************************************
 753  Function to duplicate a canon_ace entry.
 754 ****************************************************************************/
 755
 756 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 757 {
 758         canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
 759
 760         if (dst_ace == NULL)
 761                 return NULL;
 762
 763         *dst_ace = *src_ace;
 764         dst_ace->prev = dst_ace->next = NULL;
 765         return dst_ace;
 766 }
 767
 768 /****************************************************************************
 769  Print out a canon ace.
 770 ****************************************************************************/
 771
 772 static void print_canon_ace(canon_ace *pace, int num)
 773 {
 774         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 775         dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
 776         if (pace->owner_type == UID_ACE) {
 777                 const char *u_name = uidtoname(pace->unix_ug.uid);
 778                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
 779         } else if (pace->owner_type == GID_ACE) {
 780                 char *g_name = gidtoname(pace->unix_ug.gid);
 781                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
 782         } else
 783                 dbgtext( "other ");
 784         switch (pace->type) {
 785                 case SMB_ACL_USER:
 786                         dbgtext( "SMB_ACL_USER ");
 787                         break;
 788                 case SMB_ACL_USER_OBJ:
 789                         dbgtext( "SMB_ACL_USER_OBJ ");
 790                         break;
 791                 case SMB_ACL_GROUP:
 792                         dbgtext( "SMB_ACL_GROUP ");
 793                         break;
 794                 case SMB_ACL_GROUP_OBJ:
 795                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 796                         break;
 797                 case SMB_ACL_OTHER:
 798                         dbgtext( "SMB_ACL_OTHER ");
 799                         break;
 800                 default:
 801                         dbgtext( "MASK " );
 802                         break;
 803         }
 804
 805         dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
 806         dbgtext( "perms ");
 807         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 808         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 809         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 810 }
 811
 812 /****************************************************************************
 813  Print out a canon ace list.
 814 ****************************************************************************/
 815
 816 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 817 {
 818         int count = 0;
 819
 820         if( DEBUGLVL( 10 )) {
 821                 dbgtext( "print_canon_ace_list: %s\n", name );
 822                 for (;ace_list; ace_list = ace_list->next, count++)
 823                         print_canon_ace(ace_list, count );
 824         }
 825 }
 826
 827 /****************************************************************************
 828  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 829 ****************************************************************************/
 830
 831 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
 832 {
 833         mode_t ret = 0;
 834
 835         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
 836         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 837         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 838
 839         return ret;
 840 }
 841
 842 /****************************************************************************
 843  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 844 ****************************************************************************/
 845
 846 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 847 {
 848         mode_t ret = 0;
 849
 850         if (mode & r_mask)
 851                 ret |= S_IRUSR;
 852         if (mode & w_mask)
 853                 ret |= S_IWUSR;
 854         if (mode & x_mask)
 855                 ret |= S_IXUSR;
 856
 857         return ret;
 858 }
 859
 860 /****************************************************************************
 861  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 862  an SMB_ACL_PERMSET_T.
 863 ****************************************************************************/
 864
 865 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 866 {
 867         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1)
 868                 return -1;
 869         if (mode & S_IRUSR) {
 870                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
 871                         return -1;
 872         }
 873         if (mode & S_IWUSR) {
 874                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
 875                         return -1;
 876         }
 877         if (mode & S_IXUSR) {
 878                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
 879                         return -1;
 880         }
 881         return 0;
 882 }
 883
 884 /****************************************************************************
 885  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 886 ****************************************************************************/
 887
 888 void create_file_sids(const SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
 889 {
 890         uid_to_sid( powner_sid, psbuf->st_ex_uid );
 891         gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
 892 }
 893
 894 /****************************************************************************
 895  Is the identity in two ACEs equal ? Check both SID and uid/gid.
 896 ****************************************************************************/
 897
 898 static bool identity_in_ace_equal(canon_ace *ace1, canon_ace *ace2)
 899 {
 900         if (sid_equal(&ace1->trustee, &ace2->trustee)) {
 901                 return True;
 902         }
 903         if (ace1->owner_type == ace2->owner_type) {
 904                 if (ace1->owner_type == UID_ACE &&
 905                                 ace1->unix_ug.uid == ace2->unix_ug.uid) {
 906                         return True;
 907                 } else if (ace1->owner_type == GID_ACE &&
 908                                 ace1->unix_ug.gid == ace2->unix_ug.gid) {
 909                         return True;
 910                 }
 911         }
 912         return False;
 913 }
 914
 915 /****************************************************************************
 916  Merge aces with a common sid - if both are allow or deny, OR the permissions together and
 917  delete the second one. If the first is deny, mask the permissions off and delete the allow
 918  if the permissions become zero, delete the deny if the permissions are non zero.
 919 ****************************************************************************/
 920
 921 static void merge_aces( canon_ace **pp_list_head )
 922 {
 923         canon_ace *l_head = *pp_list_head;
 924         canon_ace *curr_ace_outer;
 925         canon_ace *curr_ace_outer_next;
 926
 927         /*
 928          * First, merge allow entries with identical SIDs, and deny entries
 929          * with identical SIDs.
 930          */
 931
 932         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 933                 canon_ace *curr_ace;
 934                 canon_ace *curr_ace_next;
 935
 936                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 937
 938                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 939
 940                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 941
 942                         if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
 943                                 (curr_ace->attr == curr_ace_outer->attr)) {
 944
 945                                 if( DEBUGLVL( 10 )) {
 946                                         dbgtext("merge_aces: Merging ACE's\n");
 947                                         print_canon_ace( curr_ace_outer, 0);
 948                                         print_canon_ace( curr_ace, 0);
 949                                 }
 950
 951                                 /* Merge two allow or two deny ACE's. */
 952
 953                                 curr_ace_outer->perms |= curr_ace->perms;
 954                                 DLIST_REMOVE(l_head, curr_ace);
 955                                 SAFE_FREE(curr_ace);
 956                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 957                         }
 958                 }
 959         }
 960
 961         /*
 962          * Now go through and mask off allow permissions with deny permissions.
 963          * We can delete either the allow or deny here as we know that each SID
 964          * appears only once in the list.
 965          */
 966
 967         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 968                 canon_ace *curr_ace;
 969                 canon_ace *curr_ace_next;
 970
 971                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 972
 973                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 974
 975                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 976
 977                         /*
 978                          * Subtract ACE's with different entries. Due to the ordering constraints
 979                          * we've put on the ACL, we know the deny must be the first one.
 980                          */
 981
 982                         if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
 983                                 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
 984
 985                                 if( DEBUGLVL( 10 )) {
 986                                         dbgtext("merge_aces: Masking ACE's\n");
 987                                         print_canon_ace( curr_ace_outer, 0);
 988                                         print_canon_ace( curr_ace, 0);
 989                                 }
 990
 991                                 curr_ace->perms &= ~curr_ace_outer->perms;
 992
 993                                 if (curr_ace->perms == 0) {
 994
 995                                         /*
 996                                          * The deny overrides the allow. Remove the allow.
 997                                          */
 998
 999                                         DLIST_REMOVE(l_head, curr_ace);
1000                                         SAFE_FREE(curr_ace);
1001                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1002
1003                                 } else {
1004
1005                                         /*
1006                                          * Even after removing permissions, there
1007                                          * are still allow permissions - delete the deny.
1008                                          * It is safe to delete the deny here,
1009                                          * as we are guarenteed by the deny first
1010                                          * ordering that all the deny entries for
1011                                          * this SID have already been merged into one
1012                                          * before we can get to an allow ace.
1013                                          */
1014
1015                                         DLIST_REMOVE(l_head, curr_ace_outer);
1016                                         SAFE_FREE(curr_ace_outer);
1017                                         break;
1018                                 }
1019                         }
1020
1021                 } /* end for curr_ace */
1022         } /* end for curr_ace_outer */
1023
1024         /* We may have modified the list. */
1025
1026         *pp_list_head = l_head;
1027 }
1028
1029 /****************************************************************************
1030  Check if we need to return NT4.x compatible ACL entries.
1031 ****************************************************************************/
1032
1033 bool nt4_compatible_acls(void)
1034 {
1035         int compat = lp_acl_compatibility();
1036
1037         if (compat == ACL_COMPAT_AUTO) {
1038                 enum remote_arch_types ra_type = get_remote_arch();
1039
1040                 /* Automatically adapt to client */
1041                 return (ra_type <= RA_WINNT);
1042         } else
1043                 return (compat == ACL_COMPAT_WINNT);
1044 }
1045
1046
1047 /****************************************************************************
1048  Map canon_ace perms to permission bits NT.
1049  The attr element is not used here - we only process deny entries on set,
1050  not get. Deny entries are implicit on get with ace->perms = 0.
1051 ****************************************************************************/
1052
1053 static uint32_t map_canon_ace_perms(int snum,
1054                                 enum security_ace_type *pacl_type,
1055                                 mode_t perms,
1056                                 bool directory_ace)
1057 {
1058         uint32_t nt_mask = 0;
1059
1060         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1061
1062         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1063                 if (directory_ace) {
1064                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1065                 } else {
1066                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1067                 }
1068         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1069                 /*
1070                  * Windows NT refuses to display ACEs with no permissions in them (but
1071                  * they are perfectly legal with Windows 2000). If the ACE has empty
1072                  * permissions we cannot use 0, so we use the otherwise unused
1073                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1074                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1075                  * to be changed in the future.
1076                  */
1077
1078                 if (nt4_compatible_acls())
1079                         nt_mask = UNIX_ACCESS_NONE;
1080                 else
1081                         nt_mask = 0;
1082         } else {
1083                 if (directory_ace) {
1084                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1085                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1086                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1087                 } else {
1088                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1089                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1090                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1091                 }
1092         }
1093
1094         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1095                         (unsigned int)perms, (unsigned int)nt_mask ));
1096
1097         return nt_mask;
1098 }
1099
1100 /****************************************************************************
1101  Map NT perms to a UNIX mode_t.
1102 ****************************************************************************/
1103
1104 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
1105 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
1106 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1107
1108 static mode_t map_nt_perms( uint32 *mask, int type)
1109 {
1110         mode_t mode = 0;
1111
1112         switch(type) {
1113         case S_IRUSR:
1114                 if((*mask) & GENERIC_ALL_ACCESS)
1115                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1116                 else {
1117                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1118                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1119                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1120                 }
1121                 break;
1122         case S_IRGRP:
1123                 if((*mask) & GENERIC_ALL_ACCESS)
1124                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1125                 else {
1126                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1127                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1128                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1129                 }
1130                 break;
1131         case S_IROTH:
1132                 if((*mask) & GENERIC_ALL_ACCESS)
1133                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1134                 else {
1135                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1136                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1137                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1138                 }
1139                 break;
1140         }
1141
1142         return mode;
1143 }
1144
1145 /****************************************************************************
1146  Unpack a SEC_DESC into a UNIX owner and group.
1147 ****************************************************************************/
1148
1149 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd)
1150 {
1151         DOM_SID owner_sid;
1152         DOM_SID grp_sid;
1153
1154         *puser = (uid_t)-1;
1155         *pgrp = (gid_t)-1;
1156
1157         if(security_info_sent == 0) {
1158                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1159                 return NT_STATUS_OK;
1160         }
1161
1162         /*
1163          * Validate the owner and group SID's.
1164          */
1165
1166         memset(&owner_sid, '\0', sizeof(owner_sid));
1167         memset(&grp_sid, '\0', sizeof(grp_sid));
1168
1169         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1170
1171         /*
1172          * Don't immediately fail if the owner sid cannot be validated.
1173          * This may be a group chown only set.
1174          */
1175
1176         if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1177                 sid_copy(&owner_sid, psd->owner_sid);
1178                 if (!sid_to_uid(&owner_sid, puser)) {
1179                         if (lp_force_unknown_acl_user(snum)) {
1180                                 /* this allows take ownership to work
1181                                  * reasonably */
1182                                 *puser = current_user.ut.uid;
1183                         } else {
1184                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1185                                          " owner sid for %s\n",
1186                                          sid_string_dbg(&owner_sid)));
1187                                 return NT_STATUS_INVALID_OWNER;
1188                         }
1189                 }
1190                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1191                          (unsigned int)*puser ));
1192         }
1193
1194         /*
1195          * Don't immediately fail if the group sid cannot be validated.
1196          * This may be an owner chown only set.
1197          */
1198
1199         if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1200                 sid_copy(&grp_sid, psd->group_sid);
1201                 if (!sid_to_gid( &grp_sid, pgrp)) {
1202                         if (lp_force_unknown_acl_user(snum)) {
1203                                 /* this allows take group ownership to work
1204                                  * reasonably */
1205                                 *pgrp = current_user.ut.gid;
1206                         } else {
1207                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1208                                          " group sid.\n"));
1209                                 return NT_STATUS_INVALID_OWNER;
1210                         }
1211                 }
1212                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1213                          (unsigned int)*pgrp));
1214         }
1215
1216         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1217
1218         return NT_STATUS_OK;
1219 }
1220
1221 /****************************************************************************
1222  Ensure the enforced permissions for this share apply.
1223 ****************************************************************************/
1224
1225 static void apply_default_perms(const struct share_params *params,
1226                                 const bool is_directory, canon_ace *pace,
1227                                 mode_t type)
1228 {
1229         mode_t and_bits = (mode_t)0;
1230         mode_t or_bits = (mode_t)0;
1231
1232         /* Get the initial bits to apply. */
1233
1234         if (is_directory) {
1235                 and_bits = lp_dir_security_mask(params->service);
1236                 or_bits = lp_force_dir_security_mode(params->service);
1237         } else {
1238                 and_bits = lp_security_mask(params->service);
1239                 or_bits = lp_force_security_mode(params->service);
1240         }
1241
1242         /* Now bounce them into the S_USR space. */
1243         switch(type) {
1244         case S_IRUSR:
1245                 /* Ensure owner has read access. */
1246                 pace->perms |= S_IRUSR;
1247                 if (is_directory)
1248                         pace->perms |= (S_IWUSR|S_IXUSR);
1249                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1250                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1251                 break;
1252         case S_IRGRP:
1253                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1254                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1255                 break;
1256         case S_IROTH:
1257                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1258                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1259                 break;
1260         }
1261
1262         pace->perms = ((pace->perms & and_bits)|or_bits);
1263 }
1264
1265 /****************************************************************************
1266  Check if a given uid/SID is in a group gid/SID. This is probably very
1267  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1268 ****************************************************************************/
1269
1270 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1271 {
1272         const char *u_name = NULL;
1273
1274         /* "Everyone" always matches every uid. */
1275
1276         if (sid_equal(&group_ace->trustee, &global_sid_World))
1277                 return True;
1278
1279         /*
1280          * if it's the current user, we already have the unix token
1281          * and don't need to do the complex user_in_group_sid() call
1282          */
1283         if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1284                 size_t i;
1285
1286                 if (group_ace->unix_ug.gid == current_user.ut.gid) {
1287                         return True;
1288                 }
1289
1290                 for (i=0; i < current_user.ut.ngroups; i++) {
1291                         if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1292                                 return True;
1293                         }
1294                 }
1295         }
1296
1297         /* u_name talloc'ed off tos. */
1298         u_name = uidtoname(uid_ace->unix_ug.uid);
1299         if (!u_name) {
1300                 return False;
1301         }
1302
1303         /*
1304          * user_in_group_sid() uses create_token_from_username()
1305          * which creates an artificial NT token given just a username,
1306          * so this is not reliable for users from foreign domains
1307          * exported by winbindd!
1308          */
1309         return user_in_group_sid(u_name, &group_ace->trustee);
1310 }
1311
1312 /****************************************************************************
1313  A well formed POSIX file or default ACL has at least 3 entries, a
1314  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1315  In addition, the owner must always have at least read access.
1316  When using this call on get_acl, the pst struct is valid and contains
1317  the mode of the file. When using this call on set_acl, the pst struct has
1318  been modified to have a mode containing the default for this file or directory
1319  type.
1320 ****************************************************************************/
1321
1322 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1323                                      const struct share_params *params,
1324                                      const bool is_directory,
1325                                                         const DOM_SID *pfile_owner_sid,
1326                                                         const DOM_SID *pfile_grp_sid,
1327                                                         const SMB_STRUCT_STAT *pst,
1328                                                         bool setting_acl)
1329 {
1330         canon_ace *pace;
1331         bool got_user = False;
1332         bool got_grp = False;
1333         bool got_other = False;
1334         canon_ace *pace_other = NULL;
1335
1336         for (pace = *pp_ace; pace; pace = pace->next) {
1337                 if (pace->type == SMB_ACL_USER_OBJ) {
1338
1339                         if (setting_acl)
1340                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1341                         got_user = True;
1342
1343                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1344
1345                         /*
1346                          * Ensure create mask/force create mode is respected on set.
1347                          */
1348
1349                         if (setting_acl)
1350                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1351                         got_grp = True;
1352
1353                 } else if (pace->type == SMB_ACL_OTHER) {
1354
1355                         /*
1356                          * Ensure create mask/force create mode is respected on set.
1357                          */
1358
1359                         if (setting_acl)
1360                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1361                         got_other = True;
1362                         pace_other = pace;
1363                 }
1364         }
1365
1366         if (!got_user) {
1367                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1368                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1369                         return False;
1370                 }
1371
1372                 ZERO_STRUCTP(pace);
1373                 pace->type = SMB_ACL_USER_OBJ;
1374                 pace->owner_type = UID_ACE;
1375                 pace->unix_ug.uid = pst->st_ex_uid;
1376                 pace->trustee = *pfile_owner_sid;
1377                 pace->attr = ALLOW_ACE;
1378
1379                 if (setting_acl) {
1380                         /* See if the owning user is in any of the other groups in
1381                            the ACE. If so, OR in the permissions from that group. */
1382
1383                         bool group_matched = False;
1384                         canon_ace *pace_iter;
1385
1386                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1387                                 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1388                                         if (uid_entry_in_group(pace, pace_iter)) {
1389                                                 pace->perms |= pace_iter->perms;
1390                                                 group_matched = True;
1391                                         }
1392                                 }
1393                         }
1394
1395                         /* If we only got an "everyone" perm, just use that. */
1396                         if (!group_matched) {
1397                                 if (got_other)
1398                                         pace->perms = pace_other->perms;
1399                                 else
1400                                         pace->perms = 0;
1401                         }
1402
1403                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1404                 } else {
1405                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1406                 }
1407
1408                 DLIST_ADD(*pp_ace, pace);
1409         }
1410
1411         if (!got_grp) {
1412                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1413                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1414                         return False;
1415                 }
1416
1417                 ZERO_STRUCTP(pace);
1418                 pace->type = SMB_ACL_GROUP_OBJ;
1419                 pace->owner_type = GID_ACE;
1420                 pace->unix_ug.uid = pst->st_ex_gid;
1421                 pace->trustee = *pfile_grp_sid;
1422                 pace->attr = ALLOW_ACE;
1423                 if (setting_acl) {
1424                         /* If we only got an "everyone" perm, just use that. */
1425                         if (got_other)
1426                                 pace->perms = pace_other->perms;
1427                         else
1428                                 pace->perms = 0;
1429                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1430                 } else {
1431                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1432                 }
1433
1434                 DLIST_ADD(*pp_ace, pace);
1435         }
1436
1437         if (!got_other) {
1438                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1439                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1440                         return False;
1441                 }
1442
1443                 ZERO_STRUCTP(pace);
1444                 pace->type = SMB_ACL_OTHER;
1445                 pace->owner_type = WORLD_ACE;
1446                 pace->unix_ug.world = -1;
1447                 pace->trustee = global_sid_World;
1448                 pace->attr = ALLOW_ACE;
1449                 if (setting_acl) {
1450                         pace->perms = 0;
1451                         apply_default_perms(params, is_directory, pace, S_IROTH);
1452                 } else
1453                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1454
1455                 DLIST_ADD(*pp_ace, pace);
1456         }
1457
1458         return True;
1459 }
1460
1461 /****************************************************************************
1462  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1463  If it does not have them, check if there are any entries where the trustee is the
1464  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1465 ****************************************************************************/
1466
1467 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1468 {
1469         bool got_user_obj, got_group_obj;
1470         canon_ace *current_ace;
1471         int i, entries;
1472
1473         entries = count_canon_ace_list(ace);
1474         got_user_obj = False;
1475         got_group_obj = False;
1476
1477         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1478                 if (current_ace->type == SMB_ACL_USER_OBJ)
1479                         got_user_obj = True;
1480                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1481                         got_group_obj = True;
1482         }
1483         if (got_user_obj && got_group_obj) {
1484                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1485                 return;
1486         }
1487
1488         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1489                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1490                                 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1491                         current_ace->type = SMB_ACL_USER_OBJ;
1492                         got_user_obj = True;
1493                 }
1494                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1495                                 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1496                         current_ace->type = SMB_ACL_GROUP_OBJ;
1497                         got_group_obj = True;
1498                 }
1499         }
1500         if (!got_user_obj)
1501                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1502         if (!got_group_obj)
1503                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1504 }
1505
1506 /****************************************************************************
1507  Unpack a SEC_DESC into two canonical ace lists.
1508 ****************************************************************************/
1509
1510 static bool create_canon_ace_lists(files_struct *fsp,
1511                                         SMB_STRUCT_STAT *pst,
1512                                         DOM_SID *pfile_owner_sid,
1513                                         DOM_SID *pfile_grp_sid,
1514                                         canon_ace **ppfile_ace,
1515                                         canon_ace **ppdir_ace,
1516                                         const SEC_ACL *dacl)
1517 {
1518         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1519         canon_ace *file_ace = NULL;
1520         canon_ace *dir_ace = NULL;
1521         canon_ace *current_ace = NULL;
1522         bool got_dir_allow = False;
1523         bool got_file_allow = False;
1524         int i, j;
1525
1526         *ppfile_ace = NULL;
1527         *ppdir_ace = NULL;
1528
1529         /*
1530          * Convert the incoming ACL into a more regular form.
1531          */
1532
1533         for(i = 0; i < dacl->num_aces; i++) {
1534                 SEC_ACE *psa = &dacl->aces[i];
1535
1536                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1537                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1538                         return False;
1539                 }
1540
1541                 if (nt4_compatible_acls()) {
1542                         /*
1543                          * The security mask may be UNIX_ACCESS_NONE which should map into
1544                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1545                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1546                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1547                          */
1548
1549                         /*
1550                          * Convert GENERIC bits to specific bits.
1551                          */
1552
1553                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1554
1555                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1556
1557                         if(psa->access_mask != UNIX_ACCESS_NONE)
1558                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1559                 }
1560         }
1561
1562         /*
1563          * Deal with the fact that NT 4.x re-writes the canonical format
1564          * that we return for default ACLs. If a directory ACE is identical
1565          * to a inherited directory ACE then NT changes the bits so that the
1566          * first ACE is set to OI|IO and the second ACE for this SID is set
1567          * to CI. We need to repair this. JRA.
1568          */
1569
1570         for(i = 0; i < dacl->num_aces; i++) {
1571                 SEC_ACE *psa1 = &dacl->aces[i];
1572
1573                 for (j = i + 1; j < dacl->num_aces; j++) {
1574                         SEC_ACE *psa2 = &dacl->aces[j];
1575
1576                         if (psa1->access_mask != psa2->access_mask)
1577                                 continue;
1578
1579                         if (!sid_equal(&psa1->trustee, &psa2->trustee))
1580                                 continue;
1581
1582                         /*
1583                          * Ok - permission bits and SIDs are equal.
1584                          * Check if flags were re-written.
1585                          */
1586
1587                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1588
1589                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1590                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1591
1592                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1593
1594                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1595                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1596
1597                         }
1598                 }
1599         }
1600
1601         for(i = 0; i < dacl->num_aces; i++) {
1602                 SEC_ACE *psa = &dacl->aces[i];
1603
1604                 /*
1605                  * Create a cannon_ace entry representing this NT DACL ACE.
1606                  */
1607
1608                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1609                         free_canon_ace_list(file_ace);
1610                         free_canon_ace_list(dir_ace);
1611                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1612                         return False;
1613                 }
1614
1615                 ZERO_STRUCTP(current_ace);
1616
1617                 sid_copy(&current_ace->trustee, &psa->trustee);
1618
1619                 /*
1620                  * Try and work out if the SID is a user or group
1621                  * as we need to flag these differently for POSIX.
1622                  * Note what kind of a POSIX ACL this should map to.
1623                  */
1624
1625                 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1626                         current_ace->owner_type = WORLD_ACE;
1627                         current_ace->unix_ug.world = -1;
1628                         current_ace->type = SMB_ACL_OTHER;
1629                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1630                         current_ace->owner_type = UID_ACE;
1631                         current_ace->unix_ug.uid = pst->st_ex_uid;
1632                         current_ace->type = SMB_ACL_USER_OBJ;
1633
1634                         /*
1635                          * The Creator Owner entry only specifies inheritable permissions,
1636                          * never access permissions. WinNT doesn't always set the ACE to
1637                          *INHERIT_ONLY, though.
1638                          */
1639
1640                         if (nt4_compatible_acls())
1641                                 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1642                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1643                         current_ace->owner_type = GID_ACE;
1644                         current_ace->unix_ug.gid = pst->st_ex_gid;
1645                         current_ace->type = SMB_ACL_GROUP_OBJ;
1646
1647                         /*
1648                          * The Creator Group entry only specifies inheritable permissions,
1649                          * never access permissions. WinNT doesn't always set the ACE to
1650                          *INHERIT_ONLY, though.
1651                          */
1652                         if (nt4_compatible_acls())
1653                                 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1654
1655                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1656                         current_ace->owner_type = UID_ACE;
1657                         /* If it's the owning user, this is a user_obj, not
1658                          * a user. */
1659                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1660                                 current_ace->type = SMB_ACL_USER_OBJ;
1661                         } else {
1662                                 current_ace->type = SMB_ACL_USER;
1663                         }
1664                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1665                         current_ace->owner_type = GID_ACE;
1666                         /* If it's the primary group, this is a group_obj, not
1667                          * a group. */
1668                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1669                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1670                         } else {
1671                                 current_ace->type = SMB_ACL_GROUP;
1672                         }
1673                 } else {
1674                         /*
1675                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1676                          */
1677
1678                         if (non_mappable_sid(&psa->trustee)) {
1679                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1680                                            "non-mappable SID %s\n",
1681                                            sid_string_dbg(&psa->trustee)));
1682                                 SAFE_FREE(current_ace);
1683                                 continue;
1684                         }
1685
1686                         free_canon_ace_list(file_ace);
1687                         free_canon_ace_list(dir_ace);
1688                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1689                                   "%s to uid or gid.\n",
1690                                   sid_string_dbg(&current_ace->trustee)));
1691                         SAFE_FREE(current_ace);
1692                         return False;
1693                 }
1694
1695                 /*
1696                  * Map the given NT permissions into a UNIX mode_t containing only
1697                  * S_I(R|W|X)USR bits.
1698                  */
1699
1700                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1701                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1702
1703                 /* Store the ace_flag. */
1704                 current_ace->ace_flags = psa->flags;
1705
1706                 /*
1707                  * Now add the created ace to either the file list, the directory
1708                  * list, or both. We *MUST* preserve the order here (hence we use
1709                  * DLIST_ADD_END) as NT ACLs are order dependent.
1710                  */
1711
1712                 if (fsp->is_directory) {
1713
1714                         /*
1715                          * We can only add to the default POSIX ACE list if the ACE is
1716                          * designed to be inherited by both files and directories.
1717                          */
1718
1719                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1720                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1721
1722                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1723
1724                                 /*
1725                                  * Note if this was an allow ace. We can't process
1726                                  * any further deny ace's after this.
1727                                  */
1728
1729                                 if (current_ace->attr == ALLOW_ACE)
1730                                         got_dir_allow = True;
1731
1732                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1733                                         DEBUG(0,("create_canon_ace_lists: "
1734                                                  "malformed ACL in "
1735                                                  "inheritable ACL! Deny entry "
1736                                                  "after Allow entry. Failing "
1737                                                  "to set on file %s.\n",
1738                                                  fsp_str_dbg(fsp)));
1739                                         free_canon_ace_list(file_ace);
1740                                         free_canon_ace_list(dir_ace);
1741                                         return False;
1742                                 }
1743
1744                                 if( DEBUGLVL( 10 )) {
1745                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1746                                         print_canon_ace( current_ace, 0);
1747                                 }
1748
1749                                 /*
1750                                  * If this is not an inherit only ACE we need to add a duplicate
1751                                  * to the file acl.
1752                                  */
1753
1754                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1755                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1756
1757                                         if (!dup_ace) {
1758                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1759                                                 free_canon_ace_list(file_ace);
1760                                                 free_canon_ace_list(dir_ace);
1761                                                 return False;
1762                                         }
1763
1764                                         /*
1765                                          * We must not free current_ace here as its
1766                                          * pointer is now owned by the dir_ace list.
1767                                          */
1768                                         current_ace = dup_ace;
1769                                 } else {
1770                                         /*
1771                                          * We must not free current_ace here as its
1772                                          * pointer is now owned by the dir_ace list.
1773                                          */
1774                                         current_ace = NULL;
1775                                 }
1776                         }
1777                 }
1778
1779                 /*
1780                  * Only add to the file ACL if not inherit only.
1781                  */
1782
1783                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1784                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1785
1786                         /*
1787                          * Note if this was an allow ace. We can't process
1788                          * any further deny ace's after this.
1789                          */
1790
1791                         if (current_ace->attr == ALLOW_ACE)
1792                                 got_file_allow = True;
1793
1794                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1795                                 DEBUG(0,("create_canon_ace_lists: malformed "
1796                                          "ACL in file ACL ! Deny entry after "
1797                                          "Allow entry. Failing to set on file "
1798                                          "%s.\n", fsp_str_dbg(fsp)));
1799                                 free_canon_ace_list(file_ace);
1800                                 free_canon_ace_list(dir_ace);
1801                                 return False;
1802                         }
1803
1804                         if( DEBUGLVL( 10 )) {
1805                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1806                                 print_canon_ace( current_ace, 0);
1807                         }
1808                         all_aces_are_inherit_only = False;
1809                         /*
1810                          * We must not free current_ace here as its
1811                          * pointer is now owned by the file_ace list.
1812                          */
1813                         current_ace = NULL;
1814                 }
1815
1816                 /*
1817                  * Free if ACE was not added.
1818                  */
1819
1820                 SAFE_FREE(current_ace);
1821         }
1822
1823         if (fsp->is_directory && all_aces_are_inherit_only) {
1824                 /*
1825                  * Windows 2000 is doing one of these weird 'inherit acl'
1826                  * traverses to conserve NTFS ACL resources. Just pretend
1827                  * there was no DACL sent. JRA.
1828                  */
1829
1830                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1831                 free_canon_ace_list(file_ace);
1832                 free_canon_ace_list(dir_ace);
1833                 file_ace = NULL;
1834                 dir_ace = NULL;
1835         } else {
1836                 /*
1837                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1838                  * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1839                  * entries can be converted to *_OBJ. Usually we will already have these
1840                  * entries in the Default ACL, and the Access ACL will not have them.
1841                  */
1842                 if (file_ace) {
1843                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1844                 }
1845                 if (dir_ace) {
1846                         check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1847                 }
1848         }
1849
1850         *ppfile_ace = file_ace;
1851         *ppdir_ace = dir_ace;
1852
1853         return True;
1854 }
1855
1856 /****************************************************************************
1857  ASCII art time again... JRA :-).
1858
1859  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1860  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1861  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1862  allow or deny have been merged, so the same SID can only appear once in the deny
1863  list or once in the allow list.
1864
1865  We then process as follows :
1866
1867  ---------------------------------------------------------------------------
1868  First pass - look for a Everyone DENY entry.
1869
1870  If it is deny all (rwx) trunate the list at this point.
1871  Else, walk the list from this point and use the deny permissions of this
1872  entry as a mask on all following allow entries. Finally, delete
1873  the Everyone DENY entry (we have applied it to everything possible).
1874
1875  In addition, in this pass we remove any DENY entries that have
1876  no permissions (ie. they are a DENY nothing).
1877  ---------------------------------------------------------------------------
1878  Second pass - only deal with deny user entries.
1879
1880  DENY user1 (perms XXX)
1881
1882  new_perms = 0
1883  for all following allow group entries where user1 is in group
1884         new_perms |= group_perms;
1885
1886  user1 entry perms = new_perms & ~ XXX;
1887
1888  Convert the deny entry to an allow entry with the new perms and
1889  push to the end of the list. Note if the user was in no groups
1890  this maps to a specific allow nothing entry for this user.
1891
1892  The common case from the NT ACL choser (userX deny all) is
1893  optimised so we don't do the group lookup - we just map to
1894  an allow nothing entry.
1895
1896  What we're doing here is inferring the allow permissions the
1897  person setting the ACE on user1 wanted by looking at the allow
1898  permissions on the groups the user is currently in. This will
1899  be a snapshot, depending on group membership but is the best
1900  we can do and has the advantage of failing closed rather than
1901  open.
1902  ---------------------------------------------------------------------------
1903  Third pass - only deal with deny group entries.
1904
1905  DENY group1 (perms XXX)
1906
1907  for all following allow user entries where user is in group1
1908    user entry perms = user entry perms & ~ XXX;
1909
1910  If there is a group Everyone allow entry with permissions YYY,
1911  convert the group1 entry to an allow entry and modify its
1912  permissions to be :
1913
1914  new_perms = YYY & ~ XXX
1915
1916  and push to the end of the list.
1917
1918  If there is no group Everyone allow entry then convert the
1919  group1 entry to a allow nothing entry and push to the end of the list.
1920
1921  Note that the common case from the NT ACL choser (groupX deny all)
1922  cannot be optimised here as we need to modify user entries who are
1923  in the group to change them to a deny all also.
1924
1925  What we're doing here is modifying the allow permissions of
1926  user entries (which are more specific in POSIX ACLs) to mask
1927  out the explicit deny set on the group they are in. This will
1928  be a snapshot depending on current group membership but is the
1929  best we can do and has the advantage of failing closed rather
1930  than open.
1931  ---------------------------------------------------------------------------
1932  Fourth pass - cope with cumulative permissions.
1933
1934  for all allow user entries, if there exists an allow group entry with
1935  more permissive permissions, and the user is in that group, rewrite the
1936  allow user permissions to contain both sets of permissions.
1937
1938  Currently the code for this is #ifdef'ed out as these semantics make
1939  no sense to me. JRA.
1940  ---------------------------------------------------------------------------
1941
1942  Note we *MUST* do the deny user pass first as this will convert deny user
1943  entries into allow user entries which can then be processed by the deny
1944  group pass.
1945
1946  The above algorithm took a *lot* of thinking about - hence this
1947  explaination :-). JRA.
1948 ****************************************************************************/
1949
1950 /****************************************************************************
1951  Process a canon_ace list entries. This is very complex code. We need
1952  to go through and remove the "deny" permissions from any allow entry that matches
1953  the id of this entry. We have already refused any NT ACL that wasn't in correct
1954  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1955  we just remove it (to fail safe). We have already removed any duplicate ace
1956  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1957  allow entries.
1958 ****************************************************************************/
1959
1960 static void process_deny_list( canon_ace **pp_ace_list )
1961 {
1962         canon_ace *ace_list = *pp_ace_list;
1963         canon_ace *curr_ace = NULL;
1964         canon_ace *curr_ace_next = NULL;
1965
1966         /* Pass 1 above - look for an Everyone, deny entry. */
1967
1968         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1969                 canon_ace *allow_ace_p;
1970
1971                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1972
1973                 if (curr_ace->attr != DENY_ACE)
1974                         continue;
1975
1976                 if (curr_ace->perms == (mode_t)0) {
1977
1978                         /* Deny nothing entry - delete. */
1979
1980                         DLIST_REMOVE(ace_list, curr_ace);
1981                         continue;
1982                 }
1983
1984                 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1985                         continue;
1986
1987                 /* JRATEST - assert. */
1988                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1989
1990                 if (curr_ace->perms == ALL_ACE_PERMS) {
1991
1992                         /*
1993                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1994                          * list at this point including this entry.
1995                          */
1996
1997                         canon_ace *prev_entry = curr_ace->prev;
1998
1999                         free_canon_ace_list( curr_ace );
2000                         if (prev_entry)
2001                                 prev_entry->next = NULL;
2002                         else {
2003                                 /* We deleted the entire list. */
2004                                 ace_list = NULL;
2005                         }
2006                         break;
2007                 }
2008
2009                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2010
2011                         /*
2012                          * Only mask off allow entries.
2013                          */
2014
2015                         if (allow_ace_p->attr != ALLOW_ACE)
2016                                 continue;
2017
2018                         allow_ace_p->perms &= ~curr_ace->perms;
2019                 }
2020
2021                 /*
2022                  * Now it's been applied, remove it.
2023                  */
2024
2025                 DLIST_REMOVE(ace_list, curr_ace);
2026         }
2027
2028         /* Pass 2 above - deal with deny user entries. */
2029
2030         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2031                 mode_t new_perms = (mode_t)0;
2032                 canon_ace *allow_ace_p;
2033
2034                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2035
2036                 if (curr_ace->attr != DENY_ACE)
2037                         continue;
2038
2039                 if (curr_ace->owner_type != UID_ACE)
2040                         continue;
2041
2042                 if (curr_ace->perms == ALL_ACE_PERMS) {
2043
2044                         /*
2045                          * Optimisation - this is a deny everything to this user.
2046                          * Convert to an allow nothing and push to the end of the list.
2047                          */
2048
2049                         curr_ace->attr = ALLOW_ACE;
2050                         curr_ace->perms = (mode_t)0;
2051                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2052                         continue;
2053                 }
2054
2055                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2056
2057                         if (allow_ace_p->attr != ALLOW_ACE)
2058                                 continue;
2059
2060                         /* We process GID_ACE and WORLD_ACE entries only. */
2061
2062                         if (allow_ace_p->owner_type == UID_ACE)
2063                                 continue;
2064
2065                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2066                                 new_perms |= allow_ace_p->perms;
2067                 }
2068
2069                 /*
2070                  * Convert to a allow entry, modify the perms and push to the end
2071                  * of the list.
2072                  */
2073
2074                 curr_ace->attr = ALLOW_ACE;
2075                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2076                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2077         }
2078
2079         /* Pass 3 above - deal with deny group entries. */
2080
2081         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2082                 canon_ace *allow_ace_p;
2083                 canon_ace *allow_everyone_p = NULL;
2084
2085                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2086
2087                 if (curr_ace->attr != DENY_ACE)
2088                         continue;
2089
2090                 if (curr_ace->owner_type != GID_ACE)
2091                         continue;
2092
2093                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2094
2095                         if (allow_ace_p->attr != ALLOW_ACE)
2096                                 continue;
2097
2098                         /* Store a pointer to the Everyone allow, if it exists. */
2099                         if (allow_ace_p->owner_type == WORLD_ACE)
2100                                 allow_everyone_p = allow_ace_p;
2101
2102                         /* We process UID_ACE entries only. */
2103
2104                         if (allow_ace_p->owner_type != UID_ACE)
2105                                 continue;
2106
2107                         /* Mask off the deny group perms. */
2108
2109                         if (uid_entry_in_group( allow_ace_p, curr_ace))
2110                                 allow_ace_p->perms &= ~curr_ace->perms;
2111                 }
2112
2113                 /*
2114                  * Convert the deny to an allow with the correct perms and
2115                  * push to the end of the list.
2116                  */
2117
2118                 curr_ace->attr = ALLOW_ACE;
2119                 if (allow_everyone_p)
2120                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2121                 else
2122                         curr_ace->perms = (mode_t)0;
2123                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2124         }
2125
2126         /* Doing this fourth pass allows Windows semantics to be layered
2127          * on top of POSIX semantics. I'm not sure if this is desirable.
2128          * For example, in W2K ACLs there is no way to say, "Group X no
2129          * access, user Y full access" if user Y is a member of group X.
2130          * This seems completely broken semantics to me.... JRA.
2131          */
2132
2133 #if 0
2134         /* Pass 4 above - deal with allow entries. */
2135
2136         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2137                 canon_ace *allow_ace_p;
2138
2139                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2140
2141                 if (curr_ace->attr != ALLOW_ACE)
2142                         continue;
2143
2144                 if (curr_ace->owner_type != UID_ACE)
2145                         continue;
2146
2147                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2148
2149                         if (allow_ace_p->attr != ALLOW_ACE)
2150                                 continue;
2151
2152                         /* We process GID_ACE entries only. */
2153
2154                         if (allow_ace_p->owner_type != GID_ACE)
2155                                 continue;
2156
2157                         /* OR in the group perms. */
2158
2159                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2160                                 curr_ace->perms |= allow_ace_p->perms;
2161                 }
2162         }
2163 #endif
2164
2165         *pp_ace_list = ace_list;
2166 }
2167
2168 /****************************************************************************
2169  Create a default mode that will be used if a security descriptor entry has
2170  no user/group/world entries.
2171 ****************************************************************************/
2172
2173 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2174 {
2175         int snum = SNUM(fsp->conn);
2176         mode_t and_bits = (mode_t)0;
2177         mode_t or_bits = (mode_t)0;
2178         mode_t mode;
2179
2180         if (interitable_mode) {
2181                 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2182                                  fsp->fsp_name, NULL);
2183         } else {
2184                 mode = S_IRUSR;
2185         }
2186
2187         if (fsp->is_directory)
2188                 mode |= (S_IWUSR|S_IXUSR);
2189
2190         /*
2191          * Now AND with the create mode/directory mode bits then OR with the
2192          * force create mode/force directory mode bits.
2193          */
2194
2195         if (fsp->is_directory) {
2196                 and_bits = lp_dir_security_mask(snum);
2197                 or_bits = lp_force_dir_security_mode(snum);
2198         } else {
2199                 and_bits = lp_security_mask(snum);
2200                 or_bits = lp_force_security_mode(snum);
2201         }
2202
2203         return ((mode & and_bits)|or_bits);
2204 }
2205
2206 /****************************************************************************
2207  Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2208  succeeding.
2209 ****************************************************************************/
2210
2211 static bool unpack_canon_ace(files_struct *fsp,
2212                                 SMB_STRUCT_STAT *pst,
2213                                 DOM_SID *pfile_owner_sid,
2214                                 DOM_SID *pfile_grp_sid,
2215                                 canon_ace **ppfile_ace,
2216                                 canon_ace **ppdir_ace,
2217                                 uint32 security_info_sent,
2218                                 const SEC_DESC *psd)
2219 {
2220         canon_ace *file_ace = NULL;
2221         canon_ace *dir_ace = NULL;
2222
2223         *ppfile_ace = NULL;
2224         *ppdir_ace = NULL;
2225
2226         if(security_info_sent == 0) {
2227                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2228                 return False;
2229         }
2230
2231         /*
2232          * If no DACL then this is a chown only security descriptor.
2233          */
2234
2235         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2236                 return True;
2237
2238         /*
2239          * Now go through the DACL and create the canon_ace lists.
2240          */
2241
2242         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2243                                                                 &file_ace, &dir_ace, psd->dacl))
2244                 return False;
2245
2246         if ((file_ace == NULL) && (dir_ace == NULL)) {
2247                 /* W2K traverse DACL set - ignore. */
2248                 return True;
2249         }
2250
2251         /*
2252          * Go through the canon_ace list and merge entries
2253          * belonging to identical users of identical allow or deny type.
2254          * We can do this as all deny entries come first, followed by
2255          * all allow entries (we have mandated this before accepting this acl).
2256          */
2257
2258         print_canon_ace_list( "file ace - before merge", file_ace);
2259         merge_aces( &file_ace );
2260
2261         print_canon_ace_list( "dir ace - before merge", dir_ace);
2262         merge_aces( &dir_ace );
2263
2264         /*
2265          * NT ACLs are order dependent. Go through the acl lists and
2266          * process DENY entries by masking the allow entries.
2267          */
2268
2269         print_canon_ace_list( "file ace - before deny", file_ace);
2270         process_deny_list( &file_ace);
2271
2272         print_canon_ace_list( "dir ace - before deny", dir_ace);
2273         process_deny_list( &dir_ace);
2274
2275         /*
2276          * A well formed POSIX file or default ACL has at least 3 entries, a
2277          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2278          * and optionally a mask entry. Ensure this is the case.
2279          */
2280
2281         print_canon_ace_list( "file ace - before valid", file_ace);
2282
2283         /*
2284          * A default 3 element mode entry for a file should be r-- --- ---.
2285          * A default 3 element mode entry for a directory should be rwx --- ---.
2286          */
2287
2288         pst->st_ex_mode = create_default_mode(fsp, False);
2289
2290         if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2291                 free_canon_ace_list(file_ace);
2292                 free_canon_ace_list(dir_ace);
2293                 return False;
2294         }
2295
2296         print_canon_ace_list( "dir ace - before valid", dir_ace);
2297
2298         /*
2299          * A default inheritable 3 element mode entry for a directory should be the
2300          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2301          * it's a directory.
2302          */
2303
2304         pst->st_ex_mode = create_default_mode(fsp, True);
2305
2306         if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2307                 free_canon_ace_list(file_ace);
2308                 free_canon_ace_list(dir_ace);
2309                 return False;
2310         }
2311
2312         print_canon_ace_list( "file ace - return", file_ace);
2313         print_canon_ace_list( "dir ace - return", dir_ace);
2314
2315         *ppfile_ace = file_ace;
2316         *ppdir_ace = dir_ace;
2317         return True;
2318
2319 }
2320
2321 /******************************************************************************
2322  When returning permissions, try and fit NT display
2323  semantics if possible. Note the the canon_entries here must have been malloced.
2324  The list format should be - first entry = owner, followed by group and other user
2325  entries, last entry = other.
2326
2327  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2328  are not ordered, and match on the most specific entry rather than walking a list,
2329  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2330
2331  Entry 0: owner : deny all except read and write.
2332  Entry 1: owner : allow read and write.
2333  Entry 2: group : deny all except read.
2334  Entry 3: group : allow read.
2335  Entry 4: Everyone : allow read.
2336
2337  But NT cannot display this in their ACL editor !
2338 ********************************************************************************/
2339
2340 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2341 {
2342         canon_ace *l_head = *pp_list_head;
2343         canon_ace *owner_ace = NULL;
2344         canon_ace *other_ace = NULL;
2345         canon_ace *ace = NULL;
2346
2347         for (ace = l_head; ace; ace = ace->next) {
2348                 if (ace->type == SMB_ACL_USER_OBJ)
2349                         owner_ace = ace;
2350                 else if (ace->type == SMB_ACL_OTHER) {
2351                         /* Last ace - this is "other" */
2352                         other_ace = ace;
2353                 }
2354         }
2355
2356         if (!owner_ace || !other_ace) {
2357                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2358                         filename ));
2359                 return;
2360         }
2361
2362         /*
2363          * The POSIX algorithm applies to owner first, and other last,
2364          * so ensure they are arranged in this order.
2365          */
2366
2367         if (owner_ace) {
2368                 DLIST_PROMOTE(l_head, owner_ace);
2369         }
2370
2371         if (other_ace) {
2372                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2373         }
2374
2375         /* We have probably changed the head of the list. */
2376
2377         *pp_list_head = l_head;
2378 }
2379
2380 /****************************************************************************
2381  Create a linked list of canonical ACE entries.
2382 ****************************************************************************/
2383
2384 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2385                                    const char *fname, SMB_ACL_T posix_acl,
2386                                    const SMB_STRUCT_STAT *psbuf,
2387                                    const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2388 {
2389         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2390         canon_ace *l_head = NULL;
2391         canon_ace *ace = NULL;
2392         canon_ace *next_ace = NULL;
2393         int entry_id = SMB_ACL_FIRST_ENTRY;
2394         SMB_ACL_ENTRY_T entry;
2395         size_t ace_count;
2396
2397         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2398                 SMB_ACL_TAG_T tagtype;
2399                 SMB_ACL_PERMSET_T permset;
2400                 DOM_SID sid;
2401                 posix_id unix_ug;
2402                 enum ace_owner owner_type;
2403
2404                 entry_id = SMB_ACL_NEXT_ENTRY;
2405
2406                 /* Is this a MASK entry ? */
2407                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2408                         continue;
2409
2410                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2411                         continue;
2412
2413                 /* Decide which SID to use based on the ACL type. */
2414                 switch(tagtype) {
2415                         case SMB_ACL_USER_OBJ:
2416                                 /* Get the SID from the owner. */
2417                                 sid_copy(&sid, powner);
2418                                 unix_ug.uid = psbuf->st_ex_uid;
2419                                 owner_type = UID_ACE;
2420                                 break;
2421                         case SMB_ACL_USER:
2422                                 {
2423                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2424                                         if (puid == NULL) {
2425                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2426                                                 continue;
2427                                         }
2428                                         /*
2429                                          * A SMB_ACL_USER entry for the owner is shadowed by the
2430                                          * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2431                                          * that entry, so we ignore it. We also don't create such
2432                                          * entries out of the blue when setting ACLs, so a get/set
2433                                          * cycle will drop them.
2434                                          */
2435                                         if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_ex_uid) {
2436                                                 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2437                                                 continue;
2438                                         }
2439                                         uid_to_sid( &sid, *puid);
2440                                         unix_ug.uid = *puid;
2441                                         owner_type = UID_ACE;
2442                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2443                                         break;
2444                                 }
2445                         case SMB_ACL_GROUP_OBJ:
2446                                 /* Get the SID from the owning group. */
2447                                 sid_copy(&sid, pgroup);
2448                                 unix_ug.gid = psbuf->st_ex_gid;
2449                                 owner_type = GID_ACE;
2450                                 break;
2451                         case SMB_ACL_GROUP:
2452                                 {
2453                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2454                                         if (pgid == NULL) {
2455                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2456                                                 continue;
2457                                         }
2458                                         gid_to_sid( &sid, *pgid);
2459                                         unix_ug.gid = *pgid;
2460                                         owner_type = GID_ACE;
2461                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2462                                         break;
2463                                 }
2464                         case SMB_ACL_MASK:
2465                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2466                                 continue; /* Don't count the mask as an entry. */
2467                         case SMB_ACL_OTHER:
2468                                 /* Use the Everyone SID */
2469                                 sid = global_sid_World;
2470                                 unix_ug.world = -1;
2471                                 owner_type = WORLD_ACE;
2472                                 break;
2473                         default:
2474                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2475                                 continue;
2476                 }
2477
2478                 /*
2479                  * Add this entry to the list.
2480                  */
2481
2482                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2483                         goto fail;
2484
2485                 ZERO_STRUCTP(ace);
2486                 ace->type = tagtype;
2487                 ace->perms = convert_permset_to_mode_t(conn, permset);
2488                 ace->attr = ALLOW_ACE;
2489                 ace->trustee = sid;
2490                 ace->unix_ug = unix_ug;
2491                 ace->owner_type = owner_type;
2492                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2493
2494                 DLIST_ADD(l_head, ace);
2495         }
2496
2497         /*
2498          * This next call will ensure we have at least a user/group/world set.
2499          */
2500
2501         if (!ensure_canon_entry_valid(&l_head, conn->params,
2502                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2503                                       psbuf, False))
2504                 goto fail;
2505
2506         /*
2507          * Now go through the list, masking the permissions with the
2508          * acl_mask. Ensure all DENY Entries are at the start of the list.
2509          */
2510
2511         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2512
2513         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2514                 next_ace = ace->next;
2515
2516                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2517                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2518                         ace->perms &= acl_mask;
2519
2520                 if (ace->perms == 0) {
2521                         DLIST_PROMOTE(l_head, ace);
2522                 }
2523
2524                 if( DEBUGLVL( 10 ) ) {
2525                         print_canon_ace(ace, ace_count);
2526                 }
2527         }
2528
2529         arrange_posix_perms(fname,&l_head );
2530
2531         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2532
2533         return l_head;
2534
2535   fail:
2536
2537         free_canon_ace_list(l_head);
2538         return NULL;
2539 }
2540
2541 /****************************************************************************
2542  Check if the current user group list contains a given group.
2543 ****************************************************************************/
2544
2545 static bool current_user_in_group(gid_t gid)
2546 {
2547         int i;
2548
2549         for (i = 0; i < current_user.ut.ngroups; i++) {
2550                 if (current_user.ut.groups[i] == gid) {
2551                         return True;
2552                 }
2553         }
2554
2555         return False;
2556 }
2557
2558 /****************************************************************************
2559  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2560 ****************************************************************************/
2561
2562 static bool acl_group_override(connection_struct *conn,
2563                                const struct smb_filename *smb_fname)
2564 {
2565         if ((errno != EPERM) && (errno != EACCES)) {
2566                 return false;
2567         }
2568
2569         /* file primary group == user primary or supplementary group */
2570         if (lp_acl_group_control(SNUM(conn)) &&
2571             current_user_in_group(smb_fname->st.st_ex_gid)) {
2572                 return true;
2573         }
2574
2575         /* user has writeable permission */
2576         if (lp_dos_filemode(SNUM(conn)) &&
2577             can_write_to_file(conn, smb_fname)) {
2578                 return true;
2579         }
2580
2581         return false;
2582 }
2583
2584 /****************************************************************************
2585  Attempt to apply an ACL to a file or directory.
2586 ****************************************************************************/
2587
2588 static bool set_canon_ace_list(files_struct *fsp,
2589                                 canon_ace *the_ace,
2590                                 bool default_ace,
2591                                 const SMB_STRUCT_STAT *psbuf,
2592                                 bool *pacl_set_support)
2593 {
2594         connection_struct *conn = fsp->conn;
2595         bool ret = False;
2596         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2597         canon_ace *p_ace;
2598         int i;
2599         SMB_ACL_ENTRY_T mask_entry;
2600         bool got_mask_entry = False;
2601         SMB_ACL_PERMSET_T mask_permset;
2602         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2603         bool needs_mask = False;
2604         mode_t mask_perms = 0;
2605
2606         /* Use the psbuf that was passed in. */
2607         fsp->fsp_name->st = *psbuf;
2608
2609 #if defined(POSIX_ACL_NEEDS_MASK)
2610         /* HP-UX always wants to have a mask (called "class" there). */
2611         needs_mask = True;
2612 #endif
2613
2614         if (the_acl == NULL) {
2615
2616                 if (!no_acl_syscall_error(errno)) {
2617                         /*
2618                          * Only print this error message if we have some kind of ACL
2619                          * support that's not working. Otherwise we would always get this.
2620                          */
2621                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2622                                 default_ace ? "default" : "file", strerror(errno) ));
2623                 }
2624                 *pacl_set_support = False;
2625                 goto fail;
2626         }
2627
2628         if( DEBUGLVL( 10 )) {
2629                 dbgtext("set_canon_ace_list: setting ACL:\n");
2630                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2631                         print_canon_ace( p_ace, i);
2632                 }
2633         }
2634
2635         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2636                 SMB_ACL_ENTRY_T the_entry;
2637                 SMB_ACL_PERMSET_T the_permset;
2638
2639                 /*
2640                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2641                  * named group entries. But if there is an ACL_MASK entry, it applies
2642                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2643                  * so that it doesn't deny (i.e., mask off) any permissions.
2644                  */
2645
2646                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2647                         needs_mask = True;
2648                         mask_perms |= p_ace->perms;
2649                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2650                         mask_perms |= p_ace->perms;
2651                 }
2652
2653                 /*
2654                  * Get the entry for this ACE.
2655                  */
2656
2657                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2658                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2659                                 i, strerror(errno) ));
2660                         goto fail;
2661                 }
2662
2663                 if (p_ace->type == SMB_ACL_MASK) {
2664                         mask_entry = the_entry;
2665                         got_mask_entry = True;
2666                 }
2667
2668                 /*
2669                  * Ok - we now know the ACL calls should be working, don't
2670                  * allow fallback to chmod.
2671                  */
2672
2673                 *pacl_set_support = True;
2674
2675                 /*
2676                  * Initialise the entry from the canon_ace.
2677                  */
2678
2679                 /*
2680                  * First tell the entry what type of ACE this is.
2681                  */
2682
2683                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2684                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2685                                 i, strerror(errno) ));
2686                         goto fail;
2687                 }
2688
2689                 /*
2690                  * Only set the qualifier (user or group id) if the entry is a user
2691                  * or group id ACE.
2692                  */
2693
2694                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2695                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2696                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2697                                         i, strerror(errno) ));
2698                                 goto fail;
2699                         }
2700                 }
2701
2702                 /*
2703                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2704                  */
2705
2706                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2707                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2708                                 i, strerror(errno) ));
2709                         goto fail;
2710                 }
2711
2712                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2713                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2714                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2715                         goto fail;
2716                 }
2717
2718                 /*
2719                  * ..and apply them to the entry.
2720                  */
2721
2722                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2723                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2724                                 i, strerror(errno) ));
2725                         goto fail;
2726                 }
2727
2728                 if( DEBUGLVL( 10 ))
2729                         print_canon_ace( p_ace, i);
2730
2731         }
2732
2733         if (needs_mask && !got_mask_entry) {
2734                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2735                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2736                         goto fail;
2737                 }
2738
2739                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2740                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2741                         goto fail;
2742                 }
2743
2744                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2745                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2746                         goto fail;
2747                 }
2748
2749                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2750                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2751                         goto fail;
2752                 }
2753
2754                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2755                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2756                         goto fail;
2757                 }
2758         }
2759
2760         /*
2761          * Finally apply it to the file or directory.
2762          */
2763
2764         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2765                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2766                                              the_acl_type, the_acl) == -1) {
2767                         /*
2768                          * Some systems allow all the above calls and only fail with no ACL support
2769                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2770                          */
2771                         if (no_acl_syscall_error(errno)) {
2772                                 *pacl_set_support = False;
2773                         }
2774
2775                         if (acl_group_override(conn, fsp->fsp_name)) {
2776                                 int sret;
2777
2778                                 DEBUG(5,("set_canon_ace_list: acl group "
2779                                          "control on and current user in file "
2780                                          "%s primary group.\n",
2781                                          fsp_str_dbg(fsp)));
2782
2783                                 become_root();
2784                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2785                                     fsp->fsp_name->base_name, the_acl_type,
2786                                     the_acl);
2787                                 unbecome_root();
2788                                 if (sret == 0) {
2789                                         ret = True;
2790                                 }
2791                         }
2792
2793                         if (ret == False) {
2794                                 DEBUG(2,("set_canon_ace_list: "
2795                                          "sys_acl_set_file type %s failed for "
2796                                          "file %s (%s).\n",
2797                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2798                                          "directory default" : "file",
2799                                          fsp_str_dbg(fsp), strerror(errno)));
2800                                 goto fail;
2801                         }
2802                 }
2803         } else {
2804                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2805                         /*
2806                          * Some systems allow all the above calls and only fail with no ACL support
2807                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2808                          */
2809                         if (no_acl_syscall_error(errno)) {
2810                                 *pacl_set_support = False;
2811                         }
2812
2813                         if (acl_group_override(conn, fsp->fsp_name)) {
2814                                 int sret;
2815
2816                                 DEBUG(5,("set_canon_ace_list: acl group "
2817                                          "control on and current user in file "
2818                                          "%s primary group.\n",
2819                                          fsp_str_dbg(fsp)));
2820
2821                                 become_root();
2822                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2823                                 unbecome_root();
2824                                 if (sret == 0) {
2825                                         ret = True;
2826                                 }
2827                         }
2828
2829                         if (ret == False) {
2830                                 DEBUG(2,("set_canon_ace_list: "
2831                                          "sys_acl_set_file failed for file %s "
2832                                          "(%s).\n",
2833                                          fsp_str_dbg(fsp), strerror(errno)));
2834                                 goto fail;
2835                         }
2836                 }
2837         }
2838
2839         ret = True;
2840
2841   fail:
2842
2843         if (the_acl != NULL) {
2844                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2845         }
2846
2847         return ret;
2848 }
2849
2850 /****************************************************************************
2851  Find a particular canon_ace entry.
2852 ****************************************************************************/
2853
2854 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2855 {
2856         while (list) {
2857                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2858                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2859                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2860                         break;
2861                 list = list->next;
2862         }
2863         return list;
2864 }
2865
2866 /****************************************************************************
2867
2868 ****************************************************************************/
2869
2870 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2871 {
2872         SMB_ACL_ENTRY_T entry;
2873
2874         if (!the_acl)
2875                 return NULL;
2876         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2877                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2878                 return NULL;
2879         }
2880         return the_acl;
2881 }
2882
2883 /****************************************************************************
2884  Convert a canon_ace to a generic 3 element permission - if possible.
2885 ****************************************************************************/
2886
2887 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2888
2889 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2890 {
2891         int snum = SNUM(fsp->conn);
2892         size_t ace_count = count_canon_ace_list(file_ace_list);
2893         canon_ace *ace_p;
2894         canon_ace *owner_ace = NULL;
2895         canon_ace *group_ace = NULL;
2896         canon_ace *other_ace = NULL;
2897         mode_t and_bits;
2898         mode_t or_bits;
2899
2900         if (ace_count != 3) {
2901                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2902                          "entries for file %s to convert to posix perms.\n",
2903                          fsp_str_dbg(fsp)));
2904                 return False;
2905         }
2906
2907         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2908                 if (ace_p->owner_type == UID_ACE)
2909                         owner_ace = ace_p;
2910                 else if (ace_p->owner_type == GID_ACE)
2911                         group_ace = ace_p;
2912                 else if (ace_p->owner_type == WORLD_ACE)
2913                         other_ace = ace_p;
2914         }
2915
2916         if (!owner_ace || !group_ace || !other_ace) {
2917                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
2918                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
2919                 return False;
2920         }
2921
2922         *posix_perms = (mode_t)0;
2923
2924         *posix_perms |= owner_ace->perms;
2925         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2926         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2927         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2928         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2929         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2930         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2931
2932         /* The owner must have at least read access. */
2933
2934         *posix_perms |= S_IRUSR;
2935         if (fsp->is_directory)
2936                 *posix_perms |= (S_IWUSR|S_IXUSR);
2937
2938         /* If requested apply the masks. */
2939
2940         /* Get the initial bits to apply. */
2941
2942         if (fsp->is_directory) {
2943                 and_bits = lp_dir_security_mask(snum);
2944                 or_bits = lp_force_dir_security_mode(snum);
2945         } else {
2946                 and_bits = lp_security_mask(snum);
2947                 or_bits = lp_force_security_mode(snum);
2948         }
2949
2950         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2951
2952         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
2953                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
2954                   (int)group_ace->perms, (int)other_ace->perms,
2955                   (int)*posix_perms, fsp_str_dbg(fsp)));
2956
2957         return True;
2958 }
2959
2960 /****************************************************************************
2961   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2962   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2963   with CI|OI set so it is inherited and also applies to the directory.
2964   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2965 ****************************************************************************/
2966
2967 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2968 {
2969         size_t i, j;
2970
2971         for (i = 0; i < num_aces; i++) {
2972                 for (j = i+1; j < num_aces; j++) {
2973                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2974                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2975                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2976                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2977
2978                         /* We know the lower number ACE's are file entries. */
2979                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2980                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2981                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2982                                 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2983                                 (i_inh == j_inh) &&
2984                                 (i_flags_ni == 0) &&
2985                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2986                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
2987                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
2988                                 /*
2989                                  * W2K wants to have access allowed zero access ACE's
2990                                  * at the end of the list. If the mask is zero, merge
2991                                  * the non-inherited ACE onto the inherited ACE.
2992                                  */
2993
2994                                 if (nt_ace_list[i].access_mask == 0) {
2995                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2996                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2997                                         if (num_aces - i - 1 > 0)
2998                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2999                                                                 sizeof(SEC_ACE));
3000
3001                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3002                                                 (unsigned int)i, (unsigned int)j ));
3003                                 } else {
3004                                         /*
3005                                          * These are identical except for the flags.
3006                                          * Merge the inherited ACE onto the non-inherited ACE.
3007                                          */
3008
3009                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3010                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3011                                         if (num_aces - j - 1 > 0)
3012                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3013                                                                 sizeof(SEC_ACE));
3014
3015                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3016                                                 (unsigned int)j, (unsigned int)i ));
3017                                 }
3018                                 num_aces--;
3019                                 break;
3020                         }
3021                 }
3022         }
3023
3024         return num_aces;
3025 }
3026
3027 /*
3028  * Add or Replace ACE entry.
3029  * In some cases we need to add a specific ACE for compatibility reasons.
3030  * When doing that we must make sure we are not actually creating a duplicate
3031  * entry. So we need to search whether an ACE entry already exist and eventually
3032  * replacce the access mask, or add a completely new entry if none was found.
3033  *
3034  * This function assumes the array has enough space to add a new entry without
3035  * any reallocation of memory.
3036  */
3037
3038 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3039                                 const DOM_SID *sid, enum security_ace_type type,
3040                                 uint32_t mask, uint8_t flags)
3041 {
3042         int i;
3043
3044         /* first search for a duplicate */
3045         for (i = 0; i < *num_aces; i++) {
3046                 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3047                     (nt_ace_list[i].flags == flags)) break;
3048         }
3049
3050         if (i < *num_aces) { /* found */
3051                 nt_ace_list[i].type = type;
3052                 nt_ace_list[i].access_mask = mask;
3053                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3054                            i, sid_string_dbg(sid), flags));
3055                 return;
3056         }
3057
3058         /* not found, append it */
3059         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3060 }
3061
3062
3063 /****************************************************************************
3064  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3065  the space for the return elements and returns the size needed to return the
3066  security descriptor. This should be the only external function needed for
3067  the UNIX style get ACL.
3068 ****************************************************************************/
3069
3070 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3071                                       const char *name,
3072                                       const SMB_STRUCT_STAT *sbuf,
3073                                       struct pai_val *pal,
3074                                       SMB_ACL_T posix_acl,
3075                                       SMB_ACL_T def_acl,
3076                                       uint32_t security_info,
3077                                       SEC_DESC **ppdesc)
3078 {
3079         DOM_SID owner_sid;
3080         DOM_SID group_sid;
3081         size_t sd_size = 0;
3082         SEC_ACL *psa = NULL;
3083         size_t num_acls = 0;
3084         size_t num_def_acls = 0;
3085         size_t num_aces = 0;
3086         canon_ace *file_ace = NULL;
3087         canon_ace *dir_ace = NULL;
3088         SEC_ACE *nt_ace_list = NULL;
3089         size_t num_profile_acls = 0;
3090         DOM_SID orig_owner_sid;
3091         SEC_DESC *psd = NULL;
3092         int i;
3093
3094         /*
3095          * Get the owner, group and world SIDs.
3096          */
3097
3098         create_file_sids(sbuf, &owner_sid, &group_sid);
3099
3100         if (lp_profile_acls(SNUM(conn))) {
3101                 /* For WXP SP1 the owner must be administrators. */
3102                 sid_copy(&orig_owner_sid, &owner_sid);
3103                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3104                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3105                 num_profile_acls = 3;
3106         }
3107
3108         if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3109
3110                 /*
3111                  * In the optimum case Creator Owner and Creator Group would be used for
3112                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3113                  * would lead to usability problems under Windows: The Creator entries
3114                  * are only available in browse lists of directories and not for files;
3115                  * additionally the identity of the owning group couldn't be determined.
3116                  * We therefore use those identities only for Default ACLs.
3117                  */
3118
3119                 /* Create the canon_ace lists. */
3120                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3121                                             &owner_sid, &group_sid, pal,
3122                                             SMB_ACL_TYPE_ACCESS);
3123
3124                 /* We must have *some* ACLS. */
3125
3126                 if (count_canon_ace_list(file_ace) == 0) {
3127                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3128                         goto done;
3129                 }
3130
3131                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3132                         dir_ace = canonicalise_acl(conn, name, def_acl,
3133                                                    sbuf,
3134                                                    &global_sid_Creator_Owner,
3135                                                    &global_sid_Creator_Group,
3136                                                    pal, SMB_ACL_TYPE_DEFAULT);
3137                 }
3138
3139                 /*
3140                  * Create the NT ACE list from the canonical ace lists.
3141                  */
3142
3143                 {
3144                         canon_ace *ace;
3145                         enum security_ace_type nt_acl_type;
3146
3147                         if (nt4_compatible_acls() && dir_ace) {
3148                                 /*
3149                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3150                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3151                                  * remove entries from the Access ACL if the
3152                                  * corresponding Default ACL entries have also been
3153                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3154                                  * are exceptions. We can do nothing
3155                                  * intelligent if the Default ACL contains entries that
3156                                  * are not also contained in the Access ACL, so this
3157                                  * case will still fail under NT 4.
3158                                  */
3159
3160                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3161                                 if (ace && !ace->perms) {
3162                                         DLIST_REMOVE(dir_ace, ace);
3163                                         SAFE_FREE(ace);
3164
3165                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3166                                         if (ace && !ace->perms) {
3167                                                 DLIST_REMOVE(file_ace, ace);
3168                                                 SAFE_FREE(ace);
3169                                         }
3170                                 }
3171
3172                                 /*
3173                                  * WinNT doesn't usually have Creator Group
3174                                  * in browse lists, so we send this entry to
3175                                  * WinNT even if it contains no relevant
3176                                  * permissions. Once we can add
3177                                  * Creator Group to browse lists we can
3178                                  * re-enable this.
3179                                  */
3180
3181 #if 0
3182                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3183                                 if (ace && !ace->perms) {
3184                                         DLIST_REMOVE(dir_ace, ace);
3185                                         SAFE_FREE(ace);
3186                                 }
3187 #endif
3188
3189                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3190                                 if (ace && !ace->perms) {
3191                                         DLIST_REMOVE(file_ace, ace);
3192                                         SAFE_FREE(ace);
3193                                 }
3194                         }
3195
3196                         num_acls = count_canon_ace_list(file_ace);
3197                         num_def_acls = count_canon_ace_list(dir_ace);
3198
3199                         /* Allocate the ace list. */
3200                         if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3201                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3202                                 goto done;
3203                         }
3204
3205                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3206
3207                         /*
3208                          * Create the NT ACE list from the canonical ace lists.
3209                          */
3210
3211                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3212                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3213                                                 &nt_acl_type,
3214                                                 ace->perms,
3215                                                 S_ISDIR(sbuf->st_ex_mode));
3216                                 init_sec_ace(&nt_ace_list[num_aces++],
3217                                         &ace->trustee,
3218                                         nt_acl_type,
3219                                         acc,
3220                                         ace->ace_flags);
3221                         }
3222
3223                         /* The User must have access to a profile share - even
3224                          * if we can't map the SID. */
3225                         if (lp_profile_acls(SNUM(conn))) {
3226                                 add_or_replace_ace(nt_ace_list, &num_aces,
3227                                                    &global_sid_Builtin_Users,
3228                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3229                                                    FILE_GENERIC_ALL, 0);
3230                         }
3231
3232                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3233                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3234                                                 &nt_acl_type,
3235                                                 ace->perms,
3236                                                 S_ISDIR(sbuf->st_ex_mode));
3237                                 init_sec_ace(&nt_ace_list[num_aces++],
3238                                         &ace->trustee,
3239                                         nt_acl_type,
3240                                         acc,
3241                                         ace->ace_flags |
3242                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3243                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3244                                         SEC_ACE_FLAG_INHERIT_ONLY);
3245                         }
3246
3247                         /* The User must have access to a profile share - even
3248                          * if we can't map the SID. */
3249                         if (lp_profile_acls(SNUM(conn))) {
3250                                 add_or_replace_ace(nt_ace_list, &num_aces,
3251                                                 &global_sid_Builtin_Users,
3252                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3253                                                 FILE_GENERIC_ALL,
3254                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3255                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3256                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3257                         }
3258
3259                         /*
3260                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3261                          * Win2K needs this to get the inheritance correct when replacing ACLs
3262                          * on a directory tree. Based on work by Jim @ IBM.
3263                          */
3264
3265                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3266
3267                         if (lp_profile_acls(SNUM(conn))) {
3268                                 for (i = 0; i < num_aces; i++) {
3269                                         if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3270                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3271                                                                    &orig_owner_sid,
3272                                                                    nt_ace_list[i].type,
3273                                                                    nt_ace_list[i].access_mask,
3274                                                                    nt_ace_list[i].flags);
3275                                                 break;
3276                                         }
3277                                 }
3278                         }
3279                 }
3280
3281                 if (num_aces) {
3282                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3283                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3284                                 goto done;
3285                         }
3286                 }
3287         } /* security_info & DACL_SECURITY_INFORMATION */
3288
3289         psd = make_standard_sec_desc( talloc_tos(),
3290                         (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3291                         (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3292                         psa,
3293                         &sd_size);
3294
3295         if(!psd) {
3296                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3297                 sd_size = 0;
3298                 goto done;
3299         }
3300
3301         /*
3302          * Windows 2000: The DACL_PROTECTED flag in the security
3303          * descriptor marks the ACL as non-inheriting, i.e., no
3304          * ACEs from higher level directories propagate to this
3305          * ACL. In the POSIX ACL model permissions are only
3306          * inherited at file create time, so ACLs never contain
3307          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3308          * flag doesn't seem to bother Windows NT.
3309          * Always set this if map acl inherit is turned off.
3310          */
3311         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3312                 psd->type |= SEC_DESC_DACL_PROTECTED;
3313         } else {
3314                 psd->type |= pal->sd_type;
3315         }
3316
3317         if (psd->dacl) {
3318                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3319         }
3320
3321         *ppdesc = psd;
3322
3323  done:
3324
3325         if (posix_acl) {
3326                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3327         }
3328         if (def_acl) {
3329                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3330         }
3331         free_canon_ace_list(file_ace);
3332         free_canon_ace_list(dir_ace);
3333         free_inherited_info(pal);
3334         SAFE_FREE(nt_ace_list);
3335
3336         return NT_STATUS_OK;
3337 }
3338
3339 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3340                            SEC_DESC **ppdesc)
3341 {
3342         SMB_STRUCT_STAT sbuf;
3343         SMB_ACL_T posix_acl = NULL;
3344         struct pai_val *pal;
3345
3346         *ppdesc = NULL;
3347
3348         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3349                   fsp_str_dbg(fsp)));
3350
3351         /* can it happen that fsp_name == NULL ? */
3352         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3353                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3354                                         security_info, ppdesc);
3355         }
3356
3357         /* Get the stat struct for the owner info. */
3358         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3359                 return map_nt_error_from_unix(errno);
3360         }
3361
3362         /* Get the ACL from the fd. */
3363         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3364
3365         pal = fload_inherited_info(fsp);
3366
3367         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3368                                        &sbuf, pal, posix_acl, NULL,
3369                                        security_info, ppdesc);
3370 }
3371
3372 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3373                           uint32_t security_info, SEC_DESC **ppdesc)
3374 {
3375         SMB_ACL_T posix_acl = NULL;
3376         SMB_ACL_T def_acl = NULL;
3377         struct pai_val *pal;
3378         struct smb_filename *smb_fname = NULL;
3379         NTSTATUS status;
3380         int ret;
3381
3382         *ppdesc = NULL;
3383
3384         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3385
3386         status = create_synthetic_smb_fname(talloc_tos(), name, NULL, NULL,
3387                                             &smb_fname);
3388         if (!NT_STATUS_IS_OK(status)) {
3389                 return status;
3390         }
3391
3392         /* Get the stat struct for the owner info. */
3393         if (lp_posix_pathnames()) {
3394                 ret = SMB_VFS_LSTAT(conn, smb_fname);
3395         } else {
3396                 ret = SMB_VFS_STAT(conn, smb_fname);
3397         }
3398
3399         if (ret == -1) {
3400                 status = map_nt_error_from_unix(errno);
3401                 goto out;
3402         }
3403
3404         /* Get the ACL from the path. */
3405         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3406
3407         /* If it's a directory get the default POSIX ACL. */
3408         if(S_ISDIR(smb_fname->st.st_ex_mode)) {
3409                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3410                 def_acl = free_empty_sys_acl(conn, def_acl);
3411         }
3412
3413         pal = load_inherited_info(conn, name);
3414
3415         status = posix_get_nt_acl_common(conn, name, &smb_fname->st, pal,
3416                                          posix_acl, def_acl, security_info,
3417                                          ppdesc);
3418  out:
3419         TALLOC_FREE(smb_fname);
3420         return status;
3421 }
3422
3423 /****************************************************************************
3424  Try to chown a file. We will be able to chown it under the following conditions.
3425
3426   1) If we have root privileges, then it will just work.
3427   2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3428   3) If we have SeRestorePrivilege we can change the user to any other user.
3429   4) If we have write permission to the file and dos_filemodes is set
3430      then allow chown to the currently authenticated user.
3431 ****************************************************************************/
3432
3433 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3434               uid_t uid, gid_t gid)
3435 {
3436         int ret;
3437         files_struct *fsp;
3438
3439         if(!CAN_WRITE(conn)) {
3440                 return -1;
3441         }
3442
3443         /* Case (1). */
3444         /* try the direct way first */
3445         if (lp_posix_pathnames()) {
3446                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3447         } else {
3448                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3449         }
3450
3451         if (ret == 0)
3452                 return 0;
3453
3454         /* Case (2) / (3) */
3455         if (lp_enable_privileges()) {
3456
3457                 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3458                                                               &se_take_ownership);
3459                 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3460                                                        &se_restore);
3461
3462                 /* Case (2) */
3463                 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3464                 /* Case (3) */
3465                      ( has_restore_priv ) ) {
3466
3467                         become_root();
3468                         /* Keep the current file gid the same - take ownership doesn't imply group change. */
3469                         if (lp_posix_pathnames()) {
3470                                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3471                                                     (gid_t)-1);
3472                         } else {
3473                                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3474                                                     (gid_t)-1);
3475                         }
3476                         unbecome_root();
3477                         return ret;
3478                 }
3479         }
3480
3481         /* Case (4). */
3482         if (!lp_dos_filemode(SNUM(conn))) {
3483                 errno = EPERM;
3484                 return -1;
3485         }
3486
3487         /* only allow chown to the current user. This is more secure,
3488            and also copes with the case where the SID in a take ownership ACL is
3489            a local SID on the users workstation
3490         */
3491         if (uid != current_user.ut.uid) {
3492                 errno = EPERM;
3493                 return -1;
3494         }
3495
3496         if (lp_posix_pathnames()) {
3497                 ret = SMB_VFS_LSTAT(conn, smb_fname);
3498         } else {
3499                 ret = SMB_VFS_STAT(conn, smb_fname);
3500         }
3501
3502         if (ret == -1) {
3503                 return -1;
3504         }
3505
3506         if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, smb_fname, &fsp))) {
3507                 return -1;
3508         }
3509
3510         become_root();
3511         /* Keep the current file gid the same. */
3512         ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3513         unbecome_root();
3514
3515         close_file_fchmod(NULL, fsp);
3516
3517         return ret;
3518 }
3519
3520 #if 0
3521 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3522
3523 /****************************************************************************
3524  Take care of parent ACL inheritance.
3525 ****************************************************************************/
3526
3527 NTSTATUS append_parent_acl(files_struct *fsp,
3528                                 const SEC_DESC *pcsd,
3529                                 SEC_DESC **pp_new_sd)
3530 {
3531         struct smb_filename *smb_dname = NULL;
3532         SEC_DESC *parent_sd = NULL;
3533         files_struct *parent_fsp = NULL;
3534         TALLOC_CTX *mem_ctx = talloc_tos();
3535         char *parent_name = NULL;
3536         SEC_ACE *new_ace = NULL;
3537         unsigned int num_aces = pcsd->dacl->num_aces;
3538         NTSTATUS status;
3539         int info;
3540         unsigned int i, j;
3541         SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3542         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3543
3544         if (psd == NULL) {
3545                 return NT_STATUS_NO_MEMORY;
3546         }
3547
3548         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3549                             NULL)) {
3550                 return NT_STATUS_NO_MEMORY;
3551         }
3552
3553         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3554                                             &smb_dname);
3555         if (!NT_STATUS_IS_OK(status)) {
3556                 goto fail;
3557         }
3558
3559         status = SMB_VFS_CREATE_FILE(
3560                 fsp->conn,                              /* conn */
3561                 NULL,                                   /* req */
3562                 0,                                      /* root_dir_fid */
3563                 smb_dname,                              /* fname */
3564                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3565                 FILE_SHARE_NONE,                        /* share_access */
3566                 FILE_OPEN,                              /* create_disposition*/
3567                 FILE_DIRECTORY_FILE,                    /* create_options */
3568                 0,                                      /* file_attributes */
3569                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3570                 0,                                      /* allocation_size */
3571                 NULL,                                   /* sd */
3572                 NULL,                                   /* ea_list */
3573                 &parent_fsp,                            /* result */
3574                 &info);                                 /* pinfo */
3575
3576         if (!NT_STATUS_IS_OK(status)) {
3577                 TALLOC_FREE(smb_dname);
3578                 return status;
3579         }
3580
3581         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3582                                     DACL_SECURITY_INFORMATION, &parent_sd );
3583
3584         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3585         TALLOC_FREE(smb_dname);
3586
3587         if (!NT_STATUS_IS_OK(status)) {
3588                 return status;
3589         }
3590
3591         /*
3592          * Make room for potentially all the ACLs from
3593          * the parent. We used to add the ugw triple here,
3594          * as we knew we were dealing with POSIX ACLs.
3595          * We no longer need to do so as we can guarentee
3596          * that a default ACL from the parent directory will
3597          * be well formed for POSIX ACLs if it came from a
3598          * POSIX ACL source, and if we're not writing to a
3599          * POSIX ACL sink then we don't care if it's not well
3600          * formed. JRA.
3601          */
3602
3603         num_aces += parent_sd->dacl->num_aces;
3604
3605         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3606                                         num_aces)) == NULL) {
3607                 return NT_STATUS_NO_MEMORY;
3608         }
3609
3610         /* Start by copying in all the given ACE entries. */
3611         for (i = 0; i < psd->dacl->num_aces; i++) {
3612                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3613         }
3614
3615         /*
3616          * Note that we're ignoring "inherit permissions" here
3617          * as that really only applies to newly created files. JRA.
3618          */
3619
3620         /* Finally append any inherited ACEs. */
3621         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3622                 SEC_ACE *se = &parent_sd->dacl->aces[j];
3623
3624                 if (fsp->is_directory) {
3625                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3626                                 /* Doesn't apply to a directory - ignore. */
3627                                 DEBUG(10,("append_parent_acl: directory %s "
3628                                         "ignoring non container "
3629                                         "inherit flags %u on ACE with sid %s "
3630                                         "from parent %s\n",
3631                                         fsp_str_dbg(fsp),
3632                                         (unsigned int)se->flags,
3633                                         sid_string_dbg(&se->trustee),
3634                                         parent_name));
3635                                 continue;
3636                         }
3637                 } else {
3638                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3639                                 /* Doesn't apply to a file - ignore. */
3640                                 DEBUG(10,("append_parent_acl: file %s "
3641                                         "ignoring non object "
3642                                         "inherit flags %u on ACE with sid %s "
3643                                         "from parent %s\n",
3644                                         fsp_str_dbg(fsp),
3645                                         (unsigned int)se->flags,
3646                                         sid_string_dbg(&se->trustee),
3647                                         parent_name));
3648                                 continue;
3649                         }
3650                 }
3651
3652                 if (is_dacl_protected) {
3653                         /* If the DACL is protected it means we must
3654                          * not overwrite an existing ACE entry with the
3655                          * same SID. This is order N^2. Ouch :-(. JRA. */
3656                         unsigned int k;
3657                         for (k = 0; k < psd->dacl->num_aces; k++) {
3658                                 if (sid_equal(&psd->dacl->aces[k].trustee,
3659                                                 &se->trustee)) {
3660                                         break;
3661                                 }
3662                         }
3663                         if (k < psd->dacl->num_aces) {
3664                                 /* SID matched. Ignore. */
3665                                 DEBUG(10,("append_parent_acl: path %s "
3666                                         "ignoring ACE with protected sid %s "
3667                                         "from parent %s\n",
3668                                         fsp_str_dbg(fsp),
3669                                         sid_string_dbg(&se->trustee),
3670                                         parent_name));
3671                                 continue;
3672                         }
3673                 }
3674
3675                 sec_ace_copy(&new_ace[i], se);
3676                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3677                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3678                 }
3679                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3680
3681                 if (fsp->is_directory) {
3682                         /*
3683                          * Strip off any inherit only. It's applied.
3684                          */
3685                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3686                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3687                                 /* No further inheritance. */
3688                                 new_ace[i].flags &=
3689                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3690                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3691                         }
3692                 } else {
3693                         /*
3694                          * Strip off any container or inherit
3695                          * flags, they can't apply to objects.
3696                          */
3697                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3698                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3699                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3700                 }
3701                 i++;
3702
3703                 DEBUG(10,("append_parent_acl: path %s "
3704                         "inheriting ACE with sid %s "
3705                         "from parent %s\n",
3706                         fsp_str_dbg(fsp),
3707                         sid_string_dbg(&se->trustee),
3708                         parent_name));
3709         }
3710
3711         psd->dacl->aces = new_ace;
3712         psd->dacl->num_aces = i;
3713         psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3714                          SE_DESC_DACL_AUTO_INHERIT_REQ);
3715
3716         *pp_new_sd = psd;
3717         return status;
3718 }
3719 #endif
3720
3721 /****************************************************************************
3722  Reply to set a security descriptor on an fsp. security_info_sent is the
3723  description of the following NT ACL.
3724  This should be the only external function needed for the UNIX style set ACL.
3725 ****************************************************************************/
3726
3727 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd)
3728 {
3729         connection_struct *conn = fsp->conn;
3730         uid_t user = (uid_t)-1;
3731         gid_t grp = (gid_t)-1;
3732         DOM_SID file_owner_sid;
3733         DOM_SID file_grp_sid;
3734         canon_ace *file_ace_list = NULL;
3735         canon_ace *dir_ace_list = NULL;
3736         bool acl_perms = False;
3737         mode_t orig_mode = (mode_t)0;
3738         NTSTATUS status;
3739         bool set_acl_as_root = false;
3740         bool acl_set_support = false;
3741         bool ret = false;
3742
3743         DEBUG(10,("set_nt_acl: called for file %s\n",
3744                   fsp_str_dbg(fsp)));
3745
3746         if (!CAN_WRITE(conn)) {
3747                 DEBUG(10,("set acl rejected on read-only share\n"));
3748                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3749         }
3750
3751         /*
3752          * Get the current state of the file.
3753          */
3754
3755         status = vfs_stat_fsp(fsp);
3756         if (!NT_STATUS_IS_OK(status)) {
3757                 return status;
3758         }
3759
3760         /* Save the original element we check against. */
3761         orig_mode = fsp->fsp_name->st.st_ex_mode;
3762
3763         /*
3764          * Unpack the user/group/world id's.
3765          */
3766
3767         status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3768         if (!NT_STATUS_IS_OK(status)) {
3769                 return status;
3770         }
3771
3772         /*
3773          * Do we need to chown ? If so this must be done first as the incoming
3774          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3775          * Noticed by Simo.
3776          */
3777
3778         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3779             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3780
3781                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3782                          fsp_str_dbg(fsp), (unsigned int)user,
3783                          (unsigned int)grp));
3784
3785                 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3786                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3787                                  "= %s.\n", fsp_str_dbg(fsp),
3788                                  (unsigned int)user, (unsigned int)grp,
3789                                  strerror(errno)));
3790                         if (errno == EPERM) {
3791                                 return NT_STATUS_INVALID_OWNER;
3792                         }
3793                         return map_nt_error_from_unix(errno);
3794                 }
3795
3796                 /*
3797                  * Recheck the current state of the file, which may have changed.
3798                  * (suid/sgid bits, for instance)
3799                  */
3800
3801                 status = vfs_stat_fsp(fsp);
3802                 if (!NT_STATUS_IS_OK(status)) {
3803                         return status;
3804                 }
3805
3806                 /* Save the original element we check against. */
3807                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3808
3809                 /* If we successfully chowned, we know we must
3810                  * be able to set the acl, so do it as root.
3811                  */
3812                 set_acl_as_root = true;
3813         }
3814
3815         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3816
3817         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3818                                      &file_grp_sid, &file_ace_list,
3819                                      &dir_ace_list, security_info_sent, psd);
3820
3821         /* Ignore W2K traverse DACL set. */
3822         if (!file_ace_list && !dir_ace_list) {
3823                 return NT_STATUS_OK;
3824         }
3825
3826         if (!acl_perms) {
3827                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3828                 free_canon_ace_list(file_ace_list);
3829                 free_canon_ace_list(dir_ace_list);
3830                 return NT_STATUS_ACCESS_DENIED;
3831         }
3832
3833         /*
3834          * Only change security if we got a DACL.
3835          */
3836
3837         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3838                 free_canon_ace_list(file_ace_list);
3839                 free_canon_ace_list(dir_ace_list);
3840                 return NT_STATUS_OK;
3841         }
3842
3843         /*
3844          * Try using the POSIX ACL set first. Fall back to chmod if
3845          * we have no ACL support on this filesystem.
3846          */
3847
3848         if (acl_perms && file_ace_list) {
3849                 if (set_acl_as_root) {
3850                         become_root();
3851                 }
3852                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3853                                          &fsp->fsp_name->st, &acl_set_support);
3854                 if (set_acl_as_root) {
3855                         unbecome_root();
3856                 }
3857                 if (acl_set_support && ret == false) {
3858                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3859                                  "%s (%s).\n", fsp_str_dbg(fsp),
3860                                  strerror(errno)));
3861                         free_canon_ace_list(file_ace_list);
3862                         free_canon_ace_list(dir_ace_list);
3863                         return map_nt_error_from_unix(errno);
3864                 }
3865         }
3866
3867         if (acl_perms && acl_set_support && fsp->is_directory) {
3868                 if (dir_ace_list) {
3869                         if (set_acl_as_root) {
3870                                 become_root();
3871                         }
3872                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
3873                                                  &fsp->fsp_name->st,
3874                                                  &acl_set_support);
3875                         if (set_acl_as_root) {
3876                                 unbecome_root();
3877                         }
3878                         if (ret == false) {
3879                                 DEBUG(3,("set_nt_acl: failed to set default "
3880                                          "acl on directory %s (%s).\n",
3881                                          fsp_str_dbg(fsp), strerror(errno)));
3882                                 free_canon_ace_list(file_ace_list);
3883                                 free_canon_ace_list(dir_ace_list);
3884                                 return map_nt_error_from_unix(errno);
3885                         }
3886                 } else {
3887                         int sret = -1;
3888
3889                         /*
3890                          * No default ACL - delete one if it exists.
3891                          */
3892
3893                         if (set_acl_as_root) {
3894                                 become_root();
3895                         }
3896                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3897                             fsp->fsp_name->base_name);
3898                         if (set_acl_as_root) {
3899                                 unbecome_root();
3900                         }
3901                         if (sret == -1) {
3902                                 if (acl_group_override(conn, fsp->fsp_name)) {
3903                                         DEBUG(5,("set_nt_acl: acl group "
3904                                                  "control on and current user "
3905                                                  "in file %s primary group. "
3906                                                  "Override delete_def_acl\n",
3907                                                  fsp_str_dbg(fsp)));
3908
3909                                         become_root();
3910                                         sret =
3911                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3912                                                     conn,
3913                                                     fsp->fsp_name->base_name);
3914                                         unbecome_root();
3915                                 }
3916
3917                                 if (sret == -1) {
3918                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3919                                         free_canon_ace_list(file_ace_list);
3920                                         free_canon_ace_list(dir_ace_list);
3921                                         return map_nt_error_from_unix(errno);
3922                                 }
3923                         }
3924                 }
3925         }
3926
3927         if (acl_set_support) {
3928                 if (set_acl_as_root) {
3929                         become_root();
3930                 }
3931                 store_inheritance_attributes(fsp,
3932                                 file_ace_list,
3933                                 dir_ace_list,
3934                                 psd->type);
3935                 if (set_acl_as_root) {
3936                         unbecome_root();
3937                 }
3938         }
3939
3940         /*
3941          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3942          */
3943
3944         if(!acl_set_support && acl_perms) {
3945                 mode_t posix_perms;
3946
3947                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3948                         free_canon_ace_list(file_ace_list);
3949                         free_canon_ace_list(dir_ace_list);
3950                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
3951                                  "posix permissions for file %s.\n",
3952                                  fsp_str_dbg(fsp)));
3953                         return NT_STATUS_ACCESS_DENIED;
3954                 }
3955
3956                 if (orig_mode != posix_perms) {
3957                         int sret = -1;
3958
3959                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3960                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
3961
3962                         if (set_acl_as_root) {
3963                                 become_root();
3964                         }
3965                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
3966                                              posix_perms);
3967                         if (set_acl_as_root) {
3968                                 unbecome_root();
3969                         }
3970                         if(sret == -1) {
3971                                 if (acl_group_override(conn, fsp->fsp_name)) {
3972                                         DEBUG(5,("set_nt_acl: acl group "
3973                                                  "control on and current user "
3974                                                  "in file %s primary group. "
3975                                                  "Override chmod\n",
3976                                                  fsp_str_dbg(fsp)));
3977
3978                                         become_root();
3979                                         sret = SMB_VFS_CHMOD(conn,
3980                                             fsp->fsp_name->base_name,
3981                                             posix_perms);
3982                                         unbecome_root();
3983                                 }
3984
3985                                 if (sret == -1) {
3986                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
3987                                                  "failed. Error = %s.\n",
3988                                                  fsp_str_dbg(fsp),
3989                                                  (unsigned int)posix_perms,
3990                                                  strerror(errno)));
3991                                         free_canon_ace_list(file_ace_list);
3992                                         free_canon_ace_list(dir_ace_list);
3993                                         return map_nt_error_from_unix(errno);
3994                                 }
3995                         }
3996                 }
3997         }
3998
3999         free_canon_ace_list(file_ace_list);
4000         free_canon_ace_list(dir_ace_list);
4001
4002         return NT_STATUS_OK;
4003 }
4004
4005 /****************************************************************************
4006  Get the actual group bits stored on a file with an ACL. Has no effect if
4007  the file has no ACL. Needed in dosmode code where the stat() will return
4008  the mask bits, not the real group bits, for a file with an ACL.
4009 ****************************************************************************/
4010
4011 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4012 {
4013         int entry_id = SMB_ACL_FIRST_ENTRY;
4014         SMB_ACL_ENTRY_T entry;
4015         SMB_ACL_T posix_acl;
4016         int result = -1;
4017
4018         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4019         if (posix_acl == (SMB_ACL_T)NULL)
4020                 return -1;
4021
4022         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4023                 SMB_ACL_TAG_T tagtype;
4024                 SMB_ACL_PERMSET_T permset;
4025
4026                 entry_id = SMB_ACL_NEXT_ENTRY;
4027
4028                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4029                         break;
4030
4031                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4032                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4033                                 break;
4034                         } else {
4035                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4036                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4037                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4038                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4039                                 result = 0;
4040                                 break;
4041                         }
4042                 }
4043         }
4044         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4045         return result;
4046 }
4047
4048 /****************************************************************************
4049  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4050  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4051 ****************************************************************************/
4052
4053 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4054 {
4055         int entry_id = SMB_ACL_FIRST_ENTRY;
4056         SMB_ACL_ENTRY_T entry;
4057         int num_entries = 0;
4058
4059         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4060                 SMB_ACL_TAG_T tagtype;
4061                 SMB_ACL_PERMSET_T permset;
4062                 mode_t perms;
4063
4064                 entry_id = SMB_ACL_NEXT_ENTRY;
4065
4066                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4067                         return -1;
4068
4069                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4070                         return -1;
4071
4072                 num_entries++;
4073
4074                 switch(tagtype) {
4075                         case SMB_ACL_USER_OBJ:
4076                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4077                                 break;
4078                         case SMB_ACL_GROUP_OBJ:
4079                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4080                                 break;
4081                         case SMB_ACL_MASK:
4082                                 /*
4083                                  * FIXME: The ACL_MASK entry permissions should really be set to
4084                                  * the union of the permissions of all ACL_USER,
4085                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4086                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4087                                  */
4088                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4089                                 break;
4090                         case SMB_ACL_OTHER:
4091                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4092                                 break;
4093                         default:
4094                                 continue;
4095                 }
4096
4097                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4098                         return -1;
4099
4100                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4101                         return -1;
4102         }
4103
4104         /*
4105          * If this is a simple 3 element ACL or no elements then it's a standard
4106          * UNIX permission set. Just use chmod...
4107          */
4108
4109         if ((num_entries == 3) || (num_entries == 0))
4110                 return -1;
4111
4112         return 0;
4113 }
4114
4115 /****************************************************************************
4116  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4117  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4118  resulting ACL on TO.  Note that name is in UNIX character set.
4119 ****************************************************************************/
4120
4121 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4122 {
4123         SMB_ACL_T posix_acl = NULL;
4124         int ret = -1;
4125
4126         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4127                 return -1;
4128
4129         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4130                 goto done;
4131
4132         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4133
4134  done:
4135
4136         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4137         return ret;
4138 }
4139
4140 /****************************************************************************
4141  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4142  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4143  Note that name is in UNIX character set.
4144 ****************************************************************************/
4145
4146 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4147 {
4148         return copy_access_posix_acl(conn, name, name, mode);
4149 }
4150
4151 /****************************************************************************
4152  Check for an existing default POSIX ACL on a directory.
4153 ****************************************************************************/
4154
4155 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4156 {
4157         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4158         bool has_acl = False;
4159         SMB_ACL_ENTRY_T entry;
4160
4161         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4162                 has_acl = True;
4163         }
4164
4165         if (def_acl) {
4166                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4167         }
4168         return has_acl;
4169 }
4170
4171 /****************************************************************************
4172  If the parent directory has no default ACL but it does have an Access ACL,
4173  inherit this Access ACL to file name.
4174 ****************************************************************************/
4175
4176 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4177                        const char *name, mode_t mode)
4178 {
4179         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4180                 return 0;
4181
4182         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4183 }
4184
4185 /****************************************************************************
4186  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4187  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4188 ****************************************************************************/
4189
4190 int fchmod_acl(files_struct *fsp, mode_t mode)
4191 {
4192         connection_struct *conn = fsp->conn;
4193         SMB_ACL_T posix_acl = NULL;
4194         int ret = -1;
4195
4196         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4197                 return -1;
4198
4199         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4200                 goto done;
4201
4202         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4203
4204   done:
4205
4206         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4207         return ret;
4208 }
4209
4210 /****************************************************************************
4211  Map from wire type to permset.
4212 ****************************************************************************/
4213
4214 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4215 {
4216         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4217                 return False;
4218         }
4219
4220         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4221                 return False;
4222         }
4223
4224         if (wire_perm & SMB_POSIX_ACL_READ) {
4225                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4226                         return False;
4227                 }
4228         }
4229         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4230                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4231                         return False;
4232                 }
4233         }
4234         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4235                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4236                         return False;
4237                 }
4238         }
4239         return True;
4240 }
4241
4242 /****************************************************************************
4243  Map from wire type to tagtype.
4244 ****************************************************************************/
4245
4246 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4247 {
4248         switch (wire_tt) {
4249                 case SMB_POSIX_ACL_USER_OBJ:
4250                         *p_tt = SMB_ACL_USER_OBJ;
4251                         break;
4252                 case SMB_POSIX_ACL_USER:
4253                         *p_tt = SMB_ACL_USER;
4254                         break;
4255                 case SMB_POSIX_ACL_GROUP_OBJ:
4256                         *p_tt = SMB_ACL_GROUP_OBJ;
4257                         break;
4258                 case SMB_POSIX_ACL_GROUP:
4259                         *p_tt = SMB_ACL_GROUP;
4260                         break;
4261                 case SMB_POSIX_ACL_MASK:
4262                         *p_tt = SMB_ACL_MASK;
4263                         break;
4264                 case SMB_POSIX_ACL_OTHER:
4265                         *p_tt = SMB_ACL_OTHER;
4266                         break;
4267                 default:
4268                         return False;
4269         }
4270         return True;
4271 }
4272
4273 /****************************************************************************
4274  Create a new POSIX acl from wire permissions.
4275  FIXME ! How does the share mask/mode fit into this.... ?
4276 ****************************************************************************/
4277
4278 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4279 {
4280         unsigned int i;
4281         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4282
4283         if (the_acl == NULL) {
4284                 return NULL;
4285         }
4286
4287         for (i = 0; i < num_acls; i++) {
4288                 SMB_ACL_ENTRY_T the_entry;
4289                 SMB_ACL_PERMSET_T the_permset;
4290                 SMB_ACL_TAG_T tag_type;
4291
4292                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4293                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4294                                 i, strerror(errno) ));
4295                         goto fail;
4296                 }
4297
4298                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4299                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4300                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4301                         goto fail;
4302                 }
4303
4304                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4305                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4306                                 i, strerror(errno) ));
4307                         goto fail;
4308                 }
4309
4310                 /* Get the permset pointer from the new ACL entry. */
4311                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4312                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4313                                 i, strerror(errno) ));
4314                         goto fail;
4315                 }
4316
4317                 /* Map from wire to permissions. */
4318                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4319                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4320                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4321                         goto fail;
4322                 }
4323
4324                 /* Now apply to the new ACL entry. */
4325                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4326                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4327                                 i, strerror(errno) ));
4328                         goto fail;
4329                 }
4330
4331                 if (tag_type == SMB_ACL_USER) {
4332                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4333                         uid_t uid = (uid_t)uidval;
4334                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4335                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4336                                         (unsigned int)uid, i, strerror(errno) ));
4337                                 goto fail;
4338                         }
4339                 }
4340
4341                 if (tag_type == SMB_ACL_GROUP) {
4342                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4343                         gid_t gid = (uid_t)gidval;
4344                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4345                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4346                                         (unsigned int)gid, i, strerror(errno) ));
4347                                 goto fail;
4348                         }
4349                 }
4350         }
4351
4352         return the_acl;
4353
4354  fail:
4355
4356         if (the_acl != NULL) {
4357                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4358         }
4359         return NULL;
4360 }
4361
4362 /****************************************************************************
4363  Calls from UNIX extensions - Default POSIX ACL set.
4364  If num_def_acls == 0 and not a directory just return. If it is a directory
4365  and num_def_acls == 0 then remove the default acl. Else set the default acl
4366  on the directory.
4367 ****************************************************************************/
4368
4369 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4370                                 uint16 num_def_acls, const char *pdata)
4371 {
4372         SMB_ACL_T def_acl = NULL;
4373
4374         if (!S_ISDIR(psbuf->st_ex_mode)) {
4375                 if (num_def_acls) {
4376                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4377                         errno = EISDIR;
4378                         return False;
4379                 } else {
4380                         return True;
4381                 }
4382         }
4383
4384         if (!num_def_acls) {
4385                 /* Remove the default ACL. */
4386                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4387                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4388                                 fname, strerror(errno) ));
4389                         return False;
4390                 }
4391                 return True;
4392         }
4393
4394         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4395                 return False;
4396         }
4397
4398         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4399                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4400                         fname, strerror(errno) ));
4401                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4402                 return False;
4403         }
4404
4405         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4406         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4407         return True;
4408 }
4409
4410 /****************************************************************************
4411  Remove an ACL from a file. As we don't have acl_delete_entry() available
4412  we must read the current acl and copy all entries except MASK, USER and GROUP
4413  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4414  removed.
4415  FIXME ! How does the share mask/mode fit into this.... ?
4416 ****************************************************************************/
4417
4418 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4419 {
4420         SMB_ACL_T file_acl = NULL;
4421         int entry_id = SMB_ACL_FIRST_ENTRY;
4422         SMB_ACL_ENTRY_T entry;
4423         bool ret = False;
4424         /* Create a new ACL with only 3 entries, u/g/w. */
4425         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4426         SMB_ACL_ENTRY_T user_ent = NULL;
4427         SMB_ACL_ENTRY_T group_ent = NULL;
4428         SMB_ACL_ENTRY_T other_ent = NULL;
4429
4430         if (new_file_acl == NULL) {
4431                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4432                 return False;
4433         }
4434
4435         /* Now create the u/g/w entries. */
4436         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4437                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4438                         fname, strerror(errno) ));
4439                 goto done;
4440         }
4441         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4442                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4443                         fname, strerror(errno) ));
4444                 goto done;
4445         }
4446
4447         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4448                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4449                         fname, strerror(errno) ));
4450                 goto done;
4451         }
4452         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4453                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4454                         fname, strerror(errno) ));
4455                 goto done;
4456         }
4457
4458         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4459                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4460                         fname, strerror(errno) ));
4461                 goto done;
4462         }
4463         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4464                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4465                         fname, strerror(errno) ));
4466                 goto done;
4467         }
4468
4469         /* Get the current file ACL. */
4470         if (fsp && fsp->fh->fd != -1) {
4471                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4472         } else {
4473                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4474         }
4475
4476         if (file_acl == NULL) {
4477                 /* This is only returned if an error occurred. Even for a file with
4478                    no acl a u/g/w acl should be returned. */
4479                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4480                         fname, strerror(errno) ));
4481                 goto done;
4482         }
4483
4484         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4485                 SMB_ACL_TAG_T tagtype;
4486                 SMB_ACL_PERMSET_T permset;
4487
4488                 entry_id = SMB_ACL_NEXT_ENTRY;
4489
4490                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4491                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4492                                 fname, strerror(errno) ));
4493                         goto done;
4494                 }
4495
4496                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4497                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4498                                 fname, strerror(errno) ));
4499                         goto done;
4500                 }
4501
4502                 if (tagtype == SMB_ACL_USER_OBJ) {
4503                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4504                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4505                                         fname, strerror(errno) ));
4506                         }
4507                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4508                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4509                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4510                                         fname, strerror(errno) ));
4511                         }
4512                 } else if (tagtype == SMB_ACL_OTHER) {
4513                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4514                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4515                                         fname, strerror(errno) ));
4516                         }
4517                 }
4518         }
4519
4520         /* Set the new empty file ACL. */
4521         if (fsp && fsp->fh->fd != -1) {
4522                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4523                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4524                                 fname, strerror(errno) ));
4525                         goto done;
4526                 }
4527         } else {
4528                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4529                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4530                                 fname, strerror(errno) ));
4531                         goto done;
4532                 }
4533         }
4534
4535         ret = True;
4536
4537  done:
4538
4539         if (file_acl) {
4540                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4541         }
4542         if (new_file_acl) {
4543                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4544         }
4545         return ret;
4546 }
4547
4548 /****************************************************************************
4549  Calls from UNIX extensions - POSIX ACL set.
4550  If num_def_acls == 0 then read/modify/write acl after removing all entries
4551  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4552 ****************************************************************************/
4553
4554 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4555 {
4556         SMB_ACL_T file_acl = NULL;
4557
4558         if (!num_acls) {
4559                 /* Remove the ACL from the file. */
4560                 return remove_posix_acl(conn, fsp, fname);
4561         }
4562
4563         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4564                 return False;
4565         }
4566
4567         if (fsp && fsp->fh->fd != -1) {
4568                 /* The preferred way - use an open fd. */
4569                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4570                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4571                                 fname, strerror(errno) ));
4572                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4573                         return False;
4574                 }
4575         } else {
4576                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4577                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4578                                 fname, strerror(errno) ));
4579                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4580                         return False;
4581                 }
4582         }
4583
4584         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4585         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4586         return True;
4587 }
4588
4589 /********************************************************************
4590  Pull the NT ACL from a file on disk or the OpenEventlog() access
4591  check.  Caller is responsible for freeing the returned security
4592  descriptor via TALLOC_FREE().  This is designed for dealing with
4593  user space access checks in smbd outside of the VFS.  For example,
4594  checking access rights in OpenEventlog().
4595
4596  Assume we are dealing with files (for now)
4597 ********************************************************************/
4598
4599 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4600 {
4601         SEC_DESC *psd, *ret_sd;
4602         connection_struct *conn;
4603         files_struct finfo;
4604         struct fd_handle fh;
4605         NTSTATUS status;
4606
4607         conn = TALLOC_ZERO_P(ctx, connection_struct);
4608         if (conn == NULL) {
4609                 DEBUG(0, ("talloc failed\n"));
4610                 return NULL;
4611         }
4612
4613         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4614                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4615                 TALLOC_FREE(conn);
4616                 return NULL;
4617         }
4618
4619         conn->params->service = -1;
4620
4621         set_conn_connectpath(conn, "/");
4622
4623         if (!smbd_vfs_init(conn)) {
4624                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4625                 conn_free(conn);
4626                 return NULL;
4627         }
4628
4629         ZERO_STRUCT( finfo );
4630         ZERO_STRUCT( fh );
4631
4632         finfo.fnum = -1;
4633         finfo.conn = conn;
4634         finfo.fh = &fh;
4635         finfo.fh->fd = -1;
4636
4637         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4638                                             &finfo.fsp_name);
4639         if (!NT_STATUS_IS_OK(status)) {
4640                 conn_free(conn);
4641                 return NULL;
4642         }
4643
4644         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4645                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4646                 TALLOC_FREE(finfo.fsp_name);
4647                 conn_free(conn);
4648                 return NULL;
4649         }
4650
4651         ret_sd = dup_sec_desc( ctx, psd );
4652
4653         TALLOC_FREE(finfo.fsp_name);
4654         conn_free(conn);
4655
4656         return ret_sd;
4657 }