source3/smbd/posix_acls.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB NT Security Descriptor / Unix permission conversion.
   4    Copyright (C) Jeremy Allison 1994-2009.
   5    Copyright (C) Andreas Gruenbacher 2002.
   6    Copyright (C) Simo Sorce <idra@samba.org> 2009.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "system/filesys.h"
  24 #include "../libcli/security/security.h"
  25 #include "trans2.h"
  26
  27 extern const struct generic_mapping file_generic_mapping;
  28
  29 #undef  DBGC_CLASS
  30 #define DBGC_CLASS DBGC_ACLS
  31
  32 /****************************************************************************
  33  Data structures representing the internal ACE format.
  34 ****************************************************************************/
  35
  36 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  37 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  38
  39 typedef union posix_id {
  40                 uid_t uid;
  41                 gid_t gid;
  42                 int world;
  43 } posix_id;
  44
  45 typedef struct canon_ace {
  46         struct canon_ace *next, *prev;
  47         SMB_ACL_TAG_T type;
  48         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  49         struct dom_sid trustee;
  50         enum ace_owner owner_type;
  51         enum ace_attribute attr;
  52         posix_id unix_ug;
  53         uint8_t ace_flags; /* From windows ACE entry. */
  54 } canon_ace;
  55
  56 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  57
  58 /*
  59  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  60  * attribute on disk - version 1.
  61  * All values are little endian.
  62  *
  63  * |  1   |  1   |   2         |         2           |  ....
  64  * +------+------+-------------+---------------------+-------------+--------------------+
  65  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  66  * +------+------+-------------+---------------------+-------------+--------------------+
  67  *
  68  * Entry format is :
  69  *
  70  * |  1   |       4           |
  71  * +------+-------------------+
  72  * | value|  uid/gid or world |
  73  * | type |  value            |
  74  * +------+-------------------+
  75  *
  76  * Version 2 format. Stores extra Windows metadata about an ACL.
  77  *
  78  * |  1   |  2       |   2         |         2           |  ....
  79  * +------+----------+-------------+---------------------+-------------+--------------------+
  80  * | vers | ace      | num_entries | num_default_entries | ..entries.. | default_entries... |
  81  * |   2  |  type    |             |                     |             |                    |
  82  * +------+----------+-------------+---------------------+-------------+--------------------+
  83  *
  84  * Entry format is :
  85  *
  86  * |  1   |  1   |       4           |
  87  * +------+------+-------------------+
  88  * | ace  | value|  uid/gid or world |
  89  * | flag | type |  value            |
  90  * +------+-------------------+------+
  91  *
  92  */
  93
  94 #define PAI_VERSION_OFFSET                      0
  95
  96 #define PAI_V1_FLAG_OFFSET                      1
  97 #define PAI_V1_NUM_ENTRIES_OFFSET               2
  98 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET       4
  99 #define PAI_V1_ENTRIES_BASE                     6
 100 #define PAI_V1_ACL_FLAG_PROTECTED               0x1
 101 #define PAI_V1_ENTRY_LENGTH                     5
 102
 103 #define PAI_V1_VERSION                          1
 104
 105 #define PAI_V2_TYPE_OFFSET                      1
 106 #define PAI_V2_NUM_ENTRIES_OFFSET               3
 107 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET       5
 108 #define PAI_V2_ENTRIES_BASE                     7
 109 #define PAI_V2_ENTRY_LENGTH                     6
 110
 111 #define PAI_V2_VERSION                          2
 112
 113 /*
 114  * In memory format of user.SAMBA_PAI attribute.
 115  */
 116
 117 struct pai_entry {
 118         struct pai_entry *next, *prev;
 119         uint8_t ace_flags;
 120         enum ace_owner owner_type;
 121         posix_id unix_ug;
 122 };
 123
 124 struct pai_val {
 125         uint16_t sd_type;
 126         unsigned int num_entries;
 127         struct pai_entry *entry_list;
 128         unsigned int num_def_entries;
 129         struct pai_entry *def_entry_list;
 130 };
 131
 132 /************************************************************************
 133  Return a uint32 of the pai_entry principal.
 134 ************************************************************************/
 135
 136 static uint32_t get_pai_entry_val(struct pai_entry *paie)
 137 {
 138         switch (paie->owner_type) {
 139                 case UID_ACE:
 140                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 141                         return (uint32_t)paie->unix_ug.uid;
 142                 case GID_ACE:
 143                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 144                         return (uint32_t)paie->unix_ug.gid;
 145                 case WORLD_ACE:
 146                 default:
 147                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 148                         return (uint32_t)-1;
 149         }
 150 }
 151
 152 /************************************************************************
 153  Return a uint32 of the entry principal.
 154 ************************************************************************/
 155
 156 static uint32_t get_entry_val(canon_ace *ace_entry)
 157 {
 158         switch (ace_entry->owner_type) {
 159                 case UID_ACE:
 160                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
 161                         return (uint32_t)ace_entry->unix_ug.uid;
 162                 case GID_ACE:
 163                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
 164                         return (uint32_t)ace_entry->unix_ug.gid;
 165                 case WORLD_ACE:
 166                 default:
 167                         DEBUG(10,("get_entry_val: world ace\n"));
 168                         return (uint32_t)-1;
 169         }
 170 }
 171
 172 /************************************************************************
 173  Create the on-disk format (always v2 now). Caller must free.
 174 ************************************************************************/
 175
 176 static char *create_pai_buf_v2(canon_ace *file_ace_list,
 177                                 canon_ace *dir_ace_list,
 178                                 uint16_t sd_type,
 179                                 size_t *store_size)
 180 {
 181         char *pai_buf = NULL;
 182         canon_ace *ace_list = NULL;
 183         char *entry_offset = NULL;
 184         unsigned int num_entries = 0;
 185         unsigned int num_def_entries = 0;
 186         unsigned int i;
 187
 188         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 189                 num_entries++;
 190         }
 191
 192         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 193                 num_def_entries++;
 194         }
 195
 196         DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 197
 198         *store_size = PAI_V2_ENTRIES_BASE +
 199                 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
 200
 201         pai_buf = (char *)SMB_MALLOC(*store_size);
 202         if (!pai_buf) {
 203                 return NULL;
 204         }
 205
 206         /* Set up the header. */
 207         memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
 208         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
 209         SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
 210         SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
 211         SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 212
 213         DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
 214                         (unsigned int)sd_type ));
 215
 216         entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
 217
 218         i = 0;
 219         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 220                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 221                 uint32_t entry_val = get_entry_val(ace_list);
 222
 223                 SCVAL(entry_offset,0,ace_list->ace_flags);
 224                 SCVAL(entry_offset,1,type_val);
 225                 SIVAL(entry_offset,2,entry_val);
 226                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 227                         i,
 228                         (unsigned int)ace_list->ace_flags,
 229                         (unsigned int)type_val,
 230                         (unsigned int)entry_val ));
 231                 i++;
 232                 entry_offset += PAI_V2_ENTRY_LENGTH;
 233         }
 234
 235         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 236                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 237                 uint32_t entry_val = get_entry_val(ace_list);
 238
 239                 SCVAL(entry_offset,0,ace_list->ace_flags);
 240                 SCVAL(entry_offset,1,type_val);
 241                 SIVAL(entry_offset,2,entry_val);
 242                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 243                         i,
 244                         (unsigned int)ace_list->ace_flags,
 245                         (unsigned int)type_val,
 246                         (unsigned int)entry_val ));
 247                 i++;
 248                 entry_offset += PAI_V2_ENTRY_LENGTH;
 249         }
 250
 251         return pai_buf;
 252 }
 253
 254 /************************************************************************
 255  Store the user.SAMBA_PAI attribute on disk.
 256 ************************************************************************/
 257
 258 static void store_inheritance_attributes(files_struct *fsp,
 259                                         canon_ace *file_ace_list,
 260                                         canon_ace *dir_ace_list,
 261                                         uint16_t sd_type)
 262 {
 263         int ret;
 264         size_t store_size;
 265         char *pai_buf;
 266
 267         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 268                 return;
 269         }
 270
 271         pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
 272                                 sd_type, &store_size);
 273
 274         if (fsp->fh->fd != -1) {
 275                 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 276                                 pai_buf, store_size, 0);
 277         } else {
 278                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
 279                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 280                                        pai_buf, store_size, 0);
 281         }
 282
 283         SAFE_FREE(pai_buf);
 284
 285         DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
 286                 (unsigned int)sd_type,
 287                 fsp_str_dbg(fsp)));
 288
 289         if (ret == -1 && !no_acl_syscall_error(errno)) {
 290                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 291         }
 292 }
 293
 294 /************************************************************************
 295  Delete the in memory inheritance info.
 296 ************************************************************************/
 297
 298 static void free_inherited_info(struct pai_val *pal)
 299 {
 300         if (pal) {
 301                 struct pai_entry *paie, *paie_next;
 302                 for (paie = pal->entry_list; paie; paie = paie_next) {
 303                         paie_next = paie->next;
 304                         SAFE_FREE(paie);
 305                 }
 306                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 307                         paie_next = paie->next;
 308                         SAFE_FREE(paie);
 309                 }
 310                 SAFE_FREE(pal);
 311         }
 312 }
 313
 314 /************************************************************************
 315  Get any stored ACE flags.
 316 ************************************************************************/
 317
 318 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
 319 {
 320         struct pai_entry *paie;
 321
 322         if (!pal) {
 323                 return 0;
 324         }
 325
 326         /* If the entry exists it is inherited. */
 327         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 328                 if (ace_entry->owner_type == paie->owner_type &&
 329                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 330                         return paie->ace_flags;
 331         }
 332         return 0;
 333 }
 334
 335 /************************************************************************
 336  Ensure an attribute just read is valid - v1.
 337 ************************************************************************/
 338
 339 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
 340 {
 341         uint16 num_entries;
 342         uint16 num_def_entries;
 343
 344         if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
 345                 /* Corrupted - too small. */
 346                 return false;
 347         }
 348
 349         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
 350                 return false;
 351         }
 352
 353         num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
 354         num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 355
 356         /* Check the entry lists match. */
 357         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 358
 359         if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
 360                         PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
 361                 return false;
 362         }
 363
 364         return true;
 365 }
 366
 367 /************************************************************************
 368  Ensure an attribute just read is valid - v2.
 369 ************************************************************************/
 370
 371 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
 372 {
 373         uint16 num_entries;
 374         uint16 num_def_entries;
 375
 376         if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
 377                 /* Corrupted - too small. */
 378                 return false;
 379         }
 380
 381         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
 382                 return false;
 383         }
 384
 385         num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
 386         num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 387
 388         /* Check the entry lists match. */
 389         /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
 390
 391         if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
 392                         PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
 393                 return false;
 394         }
 395
 396         return true;
 397 }
 398
 399 /************************************************************************
 400  Decode the owner.
 401 ************************************************************************/
 402
 403 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
 404 {
 405         paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 406         switch( paie->owner_type) {
 407                 case UID_ACE:
 408                         paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 409                         DEBUG(10,("get_pai_owner_type: uid = %u\n",
 410                                 (unsigned int)paie->unix_ug.uid ));
 411                         break;
 412                 case GID_ACE:
 413                         paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 414                         DEBUG(10,("get_pai_owner_type: gid = %u\n",
 415                                 (unsigned int)paie->unix_ug.gid ));
 416                         break;
 417                 case WORLD_ACE:
 418                         paie->unix_ug.world = -1;
 419                         DEBUG(10,("get_pai_owner_type: world ace\n"));
 420                         break;
 421                 default:
 422                         DEBUG(10,("get_pai_owner_type: unknown type %u\n",
 423                                 (unsigned int)paie->owner_type ));
 424                         return false;
 425         }
 426         return true;
 427 }
 428
 429 /************************************************************************
 430  Process v2 entries.
 431 ************************************************************************/
 432
 433 static const char *create_pai_v1_entries(struct pai_val *paiv,
 434                                 const char *entry_offset,
 435                                 bool def_entry)
 436 {
 437         int i;
 438
 439         for (i = 0; i < paiv->num_entries; i++) {
 440                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 441                 if (!paie) {
 442                         return NULL;
 443                 }
 444
 445                 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
 446                 if (!get_pai_owner_type(paie, entry_offset)) {
 447                         SAFE_FREE(paie);
 448                         return NULL;
 449                 }
 450
 451                 if (!def_entry) {
 452                         DLIST_ADD(paiv->entry_list, paie);
 453                 } else {
 454                         DLIST_ADD(paiv->def_entry_list, paie);
 455                 }
 456                 entry_offset += PAI_V1_ENTRY_LENGTH;
 457         }
 458         return entry_offset;
 459 }
 460
 461 /************************************************************************
 462  Convert to in-memory format from version 1.
 463 ************************************************************************/
 464
 465 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
 466 {
 467         const char *entry_offset;
 468         struct pai_val *paiv = NULL;
 469
 470         if (!check_pai_ok_v1(buf, size)) {
 471                 return NULL;
 472         }
 473
 474         paiv = SMB_MALLOC_P(struct pai_val);
 475         if (!paiv) {
 476                 return NULL;
 477         }
 478
 479         memset(paiv, '\0', sizeof(struct pai_val));
 480
 481         paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
 482                         SEC_DESC_DACL_PROTECTED : 0;
 483
 484         paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
 485         paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 486
 487         entry_offset = buf + PAI_V1_ENTRIES_BASE;
 488
 489         DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
 490                         paiv->num_entries, paiv->num_def_entries ));
 491
 492         entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
 493         if (entry_offset == NULL) {
 494                 free_inherited_info(paiv);
 495                 return NULL;
 496         }
 497         entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
 498         if (entry_offset == NULL) {
 499                 free_inherited_info(paiv);
 500                 return NULL;
 501         }
 502
 503         return paiv;
 504 }
 505
 506 /************************************************************************
 507  Process v2 entries.
 508 ************************************************************************/
 509
 510 static const char *create_pai_v2_entries(struct pai_val *paiv,
 511                                 unsigned int num_entries,
 512                                 const char *entry_offset,
 513                                 bool def_entry)
 514 {
 515         unsigned int i;
 516
 517         for (i = 0; i < num_entries; i++) {
 518                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 519                 if (!paie) {
 520                         return NULL;
 521                 }
 522
 523                 paie->ace_flags = CVAL(entry_offset,0);
 524
 525                 if (!get_pai_owner_type(paie, entry_offset+1)) {
 526                         SAFE_FREE(paie);
 527                         return NULL;
 528                 }
 529                 if (!def_entry) {
 530                         DLIST_ADD(paiv->entry_list, paie);
 531                 } else {
 532                         DLIST_ADD(paiv->def_entry_list, paie);
 533                 }
 534                 entry_offset += PAI_V2_ENTRY_LENGTH;
 535         }
 536         return entry_offset;
 537 }
 538
 539 /************************************************************************
 540  Convert to in-memory format from version 2.
 541 ************************************************************************/
 542
 543 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
 544 {
 545         const char *entry_offset;
 546         struct pai_val *paiv = NULL;
 547
 548         if (!check_pai_ok_v2(buf, size)) {
 549                 return NULL;
 550         }
 551
 552         paiv = SMB_MALLOC_P(struct pai_val);
 553         if (!paiv) {
 554                 return NULL;
 555         }
 556
 557         memset(paiv, '\0', sizeof(struct pai_val));
 558
 559         paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
 560
 561         paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
 562         paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 563
 564         entry_offset = buf + PAI_V2_ENTRIES_BASE;
 565
 566         DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
 567                         (unsigned int)paiv->sd_type,
 568                         paiv->num_entries, paiv->num_def_entries ));
 569
 570         entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
 571                                 entry_offset, false);
 572         if (entry_offset == NULL) {
 573                 free_inherited_info(paiv);
 574                 return NULL;
 575         }
 576         entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
 577                                 entry_offset, true);
 578         if (entry_offset == NULL) {
 579                 free_inherited_info(paiv);
 580                 return NULL;
 581         }
 582
 583         return paiv;
 584 }
 585
 586 /************************************************************************
 587  Convert to in-memory format - from either version 1 or 2.
 588 ************************************************************************/
 589
 590 static struct pai_val *create_pai_val(const char *buf, size_t size)
 591 {
 592         if (size < 1) {
 593                 return NULL;
 594         }
 595         if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
 596                 return create_pai_val_v1(buf, size);
 597         } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
 598                 return create_pai_val_v2(buf, size);
 599         } else {
 600                 return NULL;
 601         }
 602 }
 603
 604 /************************************************************************
 605  Load the user.SAMBA_PAI attribute.
 606 ************************************************************************/
 607
 608 static struct pai_val *fload_inherited_info(files_struct *fsp)
 609 {
 610         char *pai_buf;
 611         size_t pai_buf_size = 1024;
 612         struct pai_val *paiv = NULL;
 613         ssize_t ret;
 614
 615         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 616                 return NULL;
 617         }
 618
 619         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 620                 return NULL;
 621         }
 622
 623         do {
 624                 if (fsp->fh->fd != -1) {
 625                         ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 626                                         pai_buf, pai_buf_size);
 627                 } else {
 628                         ret = SMB_VFS_GETXATTR(fsp->conn,
 629                                                fsp->fsp_name->base_name,
 630                                                SAMBA_POSIX_INHERITANCE_EA_NAME,
 631                                                pai_buf, pai_buf_size);
 632                 }
 633
 634                 if (ret == -1) {
 635                         if (errno != ERANGE) {
 636                                 break;
 637                         }
 638                         /* Buffer too small - enlarge it. */
 639                         pai_buf_size *= 2;
 640                         SAFE_FREE(pai_buf);
 641                         if (pai_buf_size > 1024*1024) {
 642                                 return NULL; /* Limit malloc to 1mb. */
 643                         }
 644                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 645                                 return NULL;
 646                 }
 647         } while (ret == -1);
 648
 649         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
 650                   (unsigned long)ret, fsp_str_dbg(fsp)));
 651
 652         if (ret == -1) {
 653                 /* No attribute or not supported. */
 654 #if defined(ENOATTR)
 655                 if (errno != ENOATTR)
 656                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 657 #else
 658                 if (errno != ENOSYS)
 659                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 660 #endif
 661                 SAFE_FREE(pai_buf);
 662                 return NULL;
 663         }
 664
 665         paiv = create_pai_val(pai_buf, ret);
 666
 667         if (paiv) {
 668                 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
 669                           (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
 670         }
 671
 672         SAFE_FREE(pai_buf);
 673         return paiv;
 674 }
 675
 676 /************************************************************************
 677  Load the user.SAMBA_PAI attribute.
 678 ************************************************************************/
 679
 680 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
 681                                            const char *fname)
 682 {
 683         char *pai_buf;
 684         size_t pai_buf_size = 1024;
 685         struct pai_val *paiv = NULL;
 686         ssize_t ret;
 687
 688         if (!lp_map_acl_inherit(SNUM(conn))) {
 689                 return NULL;
 690         }
 691
 692         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 693                 return NULL;
 694         }
 695
 696         do {
 697                 ret = SMB_VFS_GETXATTR(conn, fname,
 698                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 699                                        pai_buf, pai_buf_size);
 700
 701                 if (ret == -1) {
 702                         if (errno != ERANGE) {
 703                                 break;
 704                         }
 705                         /* Buffer too small - enlarge it. */
 706                         pai_buf_size *= 2;
 707                         SAFE_FREE(pai_buf);
 708                         if (pai_buf_size > 1024*1024) {
 709                                 return NULL; /* Limit malloc to 1mb. */
 710                         }
 711                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 712                                 return NULL;
 713                 }
 714         } while (ret == -1);
 715
 716         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
 717
 718         if (ret == -1) {
 719                 /* No attribute or not supported. */
 720 #if defined(ENOATTR)
 721                 if (errno != ENOATTR)
 722                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 723 #else
 724                 if (errno != ENOSYS)
 725                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 726 #endif
 727                 SAFE_FREE(pai_buf);
 728                 return NULL;
 729         }
 730
 731         paiv = create_pai_val(pai_buf, ret);
 732
 733         if (paiv) {
 734                 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
 735                         (unsigned int)paiv->sd_type,
 736                         fname));
 737         }
 738
 739         SAFE_FREE(pai_buf);
 740         return paiv;
 741 }
 742
 743 /****************************************************************************
 744  Functions to manipulate the internal ACE format.
 745 ****************************************************************************/
 746
 747 /****************************************************************************
 748  Count a linked list of canonical ACE entries.
 749 ****************************************************************************/
 750
 751 static size_t count_canon_ace_list( canon_ace *l_head )
 752 {
 753         size_t count = 0;
 754         canon_ace *ace;
 755
 756         for (ace = l_head; ace; ace = ace->next)
 757                 count++;
 758
 759         return count;
 760 }
 761
 762 /****************************************************************************
 763  Free a linked list of canonical ACE entries.
 764 ****************************************************************************/
 765
 766 static void free_canon_ace_list( canon_ace *l_head )
 767 {
 768         canon_ace *list, *next;
 769
 770         for (list = l_head; list; list = next) {
 771                 next = list->next;
 772                 DLIST_REMOVE(l_head, list);
 773                 SAFE_FREE(list);
 774         }
 775 }
 776
 777 /****************************************************************************
 778  Function to duplicate a canon_ace entry.
 779 ****************************************************************************/
 780
 781 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 782 {
 783         canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
 784
 785         if (dst_ace == NULL)
 786                 return NULL;
 787
 788         *dst_ace = *src_ace;
 789         dst_ace->prev = dst_ace->next = NULL;
 790         return dst_ace;
 791 }
 792
 793 /****************************************************************************
 794  Print out a canon ace.
 795 ****************************************************************************/
 796
 797 static void print_canon_ace(canon_ace *pace, int num)
 798 {
 799         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 800         dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
 801         if (pace->owner_type == UID_ACE) {
 802                 const char *u_name = uidtoname(pace->unix_ug.uid);
 803                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
 804         } else if (pace->owner_type == GID_ACE) {
 805                 char *g_name = gidtoname(pace->unix_ug.gid);
 806                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
 807         } else
 808                 dbgtext( "other ");
 809         switch (pace->type) {
 810                 case SMB_ACL_USER:
 811                         dbgtext( "SMB_ACL_USER ");
 812                         break;
 813                 case SMB_ACL_USER_OBJ:
 814                         dbgtext( "SMB_ACL_USER_OBJ ");
 815                         break;
 816                 case SMB_ACL_GROUP:
 817                         dbgtext( "SMB_ACL_GROUP ");
 818                         break;
 819                 case SMB_ACL_GROUP_OBJ:
 820                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 821                         break;
 822                 case SMB_ACL_OTHER:
 823                         dbgtext( "SMB_ACL_OTHER ");
 824                         break;
 825                 default:
 826                         dbgtext( "MASK " );
 827                         break;
 828         }
 829
 830         dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
 831         dbgtext( "perms ");
 832         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 833         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 834         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 835 }
 836
 837 /****************************************************************************
 838  Print out a canon ace list.
 839 ****************************************************************************/
 840
 841 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 842 {
 843         int count = 0;
 844
 845         if( DEBUGLVL( 10 )) {
 846                 dbgtext( "print_canon_ace_list: %s\n", name );
 847                 for (;ace_list; ace_list = ace_list->next, count++)
 848                         print_canon_ace(ace_list, count );
 849         }
 850 }
 851
 852 /****************************************************************************
 853  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 854 ****************************************************************************/
 855
 856 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
 857 {
 858         mode_t ret = 0;
 859
 860         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
 861         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 862         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 863
 864         return ret;
 865 }
 866
 867 /****************************************************************************
 868  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 869 ****************************************************************************/
 870
 871 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 872 {
 873         mode_t ret = 0;
 874
 875         if (mode & r_mask)
 876                 ret |= S_IRUSR;
 877         if (mode & w_mask)
 878                 ret |= S_IWUSR;
 879         if (mode & x_mask)
 880                 ret |= S_IXUSR;
 881
 882         return ret;
 883 }
 884
 885 /****************************************************************************
 886  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 887  an SMB_ACL_PERMSET_T.
 888 ****************************************************************************/
 889
 890 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 891 {
 892         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1)
 893                 return -1;
 894         if (mode & S_IRUSR) {
 895                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
 896                         return -1;
 897         }
 898         if (mode & S_IWUSR) {
 899                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
 900                         return -1;
 901         }
 902         if (mode & S_IXUSR) {
 903                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
 904                         return -1;
 905         }
 906         return 0;
 907 }
 908
 909 /****************************************************************************
 910  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 911 ****************************************************************************/
 912
 913 void create_file_sids(const SMB_STRUCT_STAT *psbuf, struct dom_sid *powner_sid, struct dom_sid *pgroup_sid)
 914 {
 915         uid_to_sid( powner_sid, psbuf->st_ex_uid );
 916         gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
 917 }
 918
 919 /****************************************************************************
 920  Merge aces with a common sid - if both are allow or deny, OR the permissions together and
 921  delete the second one. If the first is deny, mask the permissions off and delete the allow
 922  if the permissions become zero, delete the deny if the permissions are non zero.
 923 ****************************************************************************/
 924
 925 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
 926 {
 927         canon_ace *l_head = *pp_list_head;
 928         canon_ace *curr_ace_outer;
 929         canon_ace *curr_ace_outer_next;
 930
 931         /*
 932          * First, merge allow entries with identical SIDs, and deny entries
 933          * with identical SIDs.
 934          */
 935
 936         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 937                 canon_ace *curr_ace;
 938                 canon_ace *curr_ace_next;
 939
 940                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 941
 942                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 943                         bool can_merge = false;
 944
 945                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 946
 947                         /* For file ACLs we can merge if the SIDs and ALLOW/DENY
 948                          * types are the same. For directory acls we must also
 949                          * ensure the POSIX ACL types are the same. */
 950
 951                         if (!dir_acl) {
 952                                 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 953                                                 (curr_ace->attr == curr_ace_outer->attr));
 954                         } else {
 955                                 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 956                                                 (curr_ace->type == curr_ace_outer->type) &&
 957                                                 (curr_ace->attr == curr_ace_outer->attr));
 958                         }
 959
 960                         if (can_merge) {
 961                                 if( DEBUGLVL( 10 )) {
 962                                         dbgtext("merge_aces: Merging ACE's\n");
 963                                         print_canon_ace( curr_ace_outer, 0);
 964                                         print_canon_ace( curr_ace, 0);
 965                                 }
 966
 967                                 /* Merge two allow or two deny ACE's. */
 968
 969                                 /* Theoretically we shouldn't merge a dir ACE if
 970                                  * one ACE has the CI flag set, and the other
 971                                  * ACE has the OI flag set, but this is rare
 972                                  * enough we can ignore it. */
 973
 974                                 curr_ace_outer->perms |= curr_ace->perms;
 975                                 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
 976                                 DLIST_REMOVE(l_head, curr_ace);
 977                                 SAFE_FREE(curr_ace);
 978                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 979                         }
 980                 }
 981         }
 982
 983         /*
 984          * Now go through and mask off allow permissions with deny permissions.
 985          * We can delete either the allow or deny here as we know that each SID
 986          * appears only once in the list.
 987          */
 988
 989         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 990                 canon_ace *curr_ace;
 991                 canon_ace *curr_ace_next;
 992
 993                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 994
 995                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 996
 997                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 998
 999                         /*
1000                          * Subtract ACE's with different entries. Due to the ordering constraints
1001                          * we've put on the ACL, we know the deny must be the first one.
1002                          */
1003
1004                         if (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1005                                 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1006
1007                                 if( DEBUGLVL( 10 )) {
1008                                         dbgtext("merge_aces: Masking ACE's\n");
1009                                         print_canon_ace( curr_ace_outer, 0);
1010                                         print_canon_ace( curr_ace, 0);
1011                                 }
1012
1013                                 curr_ace->perms &= ~curr_ace_outer->perms;
1014
1015                                 if (curr_ace->perms == 0) {
1016
1017                                         /*
1018                                          * The deny overrides the allow. Remove the allow.
1019                                          */
1020
1021                                         DLIST_REMOVE(l_head, curr_ace);
1022                                         SAFE_FREE(curr_ace);
1023                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1024
1025                                 } else {
1026
1027                                         /*
1028                                          * Even after removing permissions, there
1029                                          * are still allow permissions - delete the deny.
1030                                          * It is safe to delete the deny here,
1031                                          * as we are guarenteed by the deny first
1032                                          * ordering that all the deny entries for
1033                                          * this SID have already been merged into one
1034                                          * before we can get to an allow ace.
1035                                          */
1036
1037                                         DLIST_REMOVE(l_head, curr_ace_outer);
1038                                         SAFE_FREE(curr_ace_outer);
1039                                         break;
1040                                 }
1041                         }
1042
1043                 } /* end for curr_ace */
1044         } /* end for curr_ace_outer */
1045
1046         /* We may have modified the list. */
1047
1048         *pp_list_head = l_head;
1049 }
1050
1051 /****************************************************************************
1052  Check if we need to return NT4.x compatible ACL entries.
1053 ****************************************************************************/
1054
1055 bool nt4_compatible_acls(void)
1056 {
1057         int compat = lp_acl_compatibility();
1058
1059         if (compat == ACL_COMPAT_AUTO) {
1060                 enum remote_arch_types ra_type = get_remote_arch();
1061
1062                 /* Automatically adapt to client */
1063                 return (ra_type <= RA_WINNT);
1064         } else
1065                 return (compat == ACL_COMPAT_WINNT);
1066 }
1067
1068
1069 /****************************************************************************
1070  Map canon_ace perms to permission bits NT.
1071  The attr element is not used here - we only process deny entries on set,
1072  not get. Deny entries are implicit on get with ace->perms = 0.
1073 ****************************************************************************/
1074
1075 uint32_t map_canon_ace_perms(int snum,
1076                                 enum security_ace_type *pacl_type,
1077                                 mode_t perms,
1078                                 bool directory_ace)
1079 {
1080         uint32_t nt_mask = 0;
1081
1082         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1083
1084         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1085                 if (directory_ace) {
1086                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1087                 } else {
1088                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1089                 }
1090         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1091                 /*
1092                  * Windows NT refuses to display ACEs with no permissions in them (but
1093                  * they are perfectly legal with Windows 2000). If the ACE has empty
1094                  * permissions we cannot use 0, so we use the otherwise unused
1095                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1096                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1097                  * to be changed in the future.
1098                  */
1099
1100                 if (nt4_compatible_acls())
1101                         nt_mask = UNIX_ACCESS_NONE;
1102                 else
1103                         nt_mask = 0;
1104         } else {
1105                 if (directory_ace) {
1106                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1107                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1108                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1109                 } else {
1110                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1111                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1112                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1113                 }
1114         }
1115
1116         if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1117                 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1118         }
1119
1120         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1121                         (unsigned int)perms, (unsigned int)nt_mask ));
1122
1123         return nt_mask;
1124 }
1125
1126 /****************************************************************************
1127  Map NT perms to a UNIX mode_t.
1128 ****************************************************************************/
1129
1130 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
1131 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
1132 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1133
1134 static mode_t map_nt_perms( uint32 *mask, int type)
1135 {
1136         mode_t mode = 0;
1137
1138         switch(type) {
1139         case S_IRUSR:
1140                 if((*mask) & GENERIC_ALL_ACCESS)
1141                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1142                 else {
1143                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1144                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1145                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1146                 }
1147                 break;
1148         case S_IRGRP:
1149                 if((*mask) & GENERIC_ALL_ACCESS)
1150                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1151                 else {
1152                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1153                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1154                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1155                 }
1156                 break;
1157         case S_IROTH:
1158                 if((*mask) & GENERIC_ALL_ACCESS)
1159                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1160                 else {
1161                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1162                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1163                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1164                 }
1165                 break;
1166         }
1167
1168         return mode;
1169 }
1170
1171 /****************************************************************************
1172  Unpack a struct security_descriptor into a UNIX owner and group.
1173 ****************************************************************************/
1174
1175 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1176                         uid_t *puser, gid_t *pgrp,
1177                         uint32 security_info_sent, const struct
1178                         security_descriptor *psd)
1179 {
1180         struct dom_sid owner_sid;
1181         struct dom_sid grp_sid;
1182
1183         *puser = (uid_t)-1;
1184         *pgrp = (gid_t)-1;
1185
1186         if(security_info_sent == 0) {
1187                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1188                 return NT_STATUS_OK;
1189         }
1190
1191         /*
1192          * Validate the owner and group SID's.
1193          */
1194
1195         memset(&owner_sid, '\0', sizeof(owner_sid));
1196         memset(&grp_sid, '\0', sizeof(grp_sid));
1197
1198         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1199
1200         /*
1201          * Don't immediately fail if the owner sid cannot be validated.
1202          * This may be a group chown only set.
1203          */
1204
1205         if (security_info_sent & SECINFO_OWNER) {
1206                 sid_copy(&owner_sid, psd->owner_sid);
1207                 if (!sid_to_uid(&owner_sid, puser)) {
1208                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1209                                 /* this allows take ownership to work
1210                                  * reasonably */
1211                                 *puser = get_current_uid(conn);
1212                         } else {
1213                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1214                                          " owner sid for %s\n",
1215                                          sid_string_dbg(&owner_sid)));
1216                                 return NT_STATUS_INVALID_OWNER;
1217                         }
1218                 }
1219                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1220                          (unsigned int)*puser ));
1221         }
1222
1223         /*
1224          * Don't immediately fail if the group sid cannot be validated.
1225          * This may be an owner chown only set.
1226          */
1227
1228         if (security_info_sent & SECINFO_GROUP) {
1229                 sid_copy(&grp_sid, psd->group_sid);
1230                 if (!sid_to_gid( &grp_sid, pgrp)) {
1231                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1232                                 /* this allows take group ownership to work
1233                                  * reasonably */
1234                                 *pgrp = get_current_gid(conn);
1235                         } else {
1236                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1237                                          " group sid.\n"));
1238                                 return NT_STATUS_INVALID_OWNER;
1239                         }
1240                 }
1241                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1242                          (unsigned int)*pgrp));
1243         }
1244
1245         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1246
1247         return NT_STATUS_OK;
1248 }
1249
1250 /****************************************************************************
1251  Ensure the enforced permissions for this share apply.
1252 ****************************************************************************/
1253
1254 static void apply_default_perms(const struct share_params *params,
1255                                 const bool is_directory, canon_ace *pace,
1256                                 mode_t type)
1257 {
1258         mode_t and_bits = (mode_t)0;
1259         mode_t or_bits = (mode_t)0;
1260
1261         /* Get the initial bits to apply. */
1262
1263         if (is_directory) {
1264                 and_bits = lp_dir_security_mask(params->service);
1265                 or_bits = lp_force_dir_security_mode(params->service);
1266         } else {
1267                 and_bits = lp_security_mask(params->service);
1268                 or_bits = lp_force_security_mode(params->service);
1269         }
1270
1271         /* Now bounce them into the S_USR space. */
1272         switch(type) {
1273         case S_IRUSR:
1274                 /* Ensure owner has read access. */
1275                 pace->perms |= S_IRUSR;
1276                 if (is_directory)
1277                         pace->perms |= (S_IWUSR|S_IXUSR);
1278                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1279                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1280                 break;
1281         case S_IRGRP:
1282                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1283                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1284                 break;
1285         case S_IROTH:
1286                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1287                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1288                 break;
1289         }
1290
1291         pace->perms = ((pace->perms & and_bits)|or_bits);
1292 }
1293
1294 /****************************************************************************
1295  Check if a given uid/SID is in a group gid/SID. This is probably very
1296  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1297 ****************************************************************************/
1298
1299 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1300 {
1301         const char *u_name = NULL;
1302
1303         /* "Everyone" always matches every uid. */
1304
1305         if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1306                 return True;
1307
1308         /*
1309          * if it's the current user, we already have the unix token
1310          * and don't need to do the complex user_in_group_sid() call
1311          */
1312         if (uid_ace->unix_ug.uid == get_current_uid(conn)) {
1313                 const struct security_unix_token *curr_utok = NULL;
1314                 size_t i;
1315
1316                 if (group_ace->unix_ug.gid == get_current_gid(conn)) {
1317                         return True;
1318                 }
1319
1320                 curr_utok = get_current_utok(conn);
1321                 for (i=0; i < curr_utok->ngroups; i++) {
1322                         if (group_ace->unix_ug.gid == curr_utok->groups[i]) {
1323                                 return True;
1324                         }
1325                 }
1326         }
1327
1328         /* u_name talloc'ed off tos. */
1329         u_name = uidtoname(uid_ace->unix_ug.uid);
1330         if (!u_name) {
1331                 return False;
1332         }
1333
1334         /*
1335          * user_in_group_sid() uses create_token_from_username()
1336          * which creates an artificial NT token given just a username,
1337          * so this is not reliable for users from foreign domains
1338          * exported by winbindd!
1339          */
1340         return user_in_group_sid(u_name, &group_ace->trustee);
1341 }
1342
1343 /****************************************************************************
1344  A well formed POSIX file or default ACL has at least 3 entries, a
1345  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1346  In addition, the owner must always have at least read access.
1347  When using this call on get_acl, the pst struct is valid and contains
1348  the mode of the file. When using this call on set_acl, the pst struct has
1349  been modified to have a mode containing the default for this file or directory
1350  type.
1351 ****************************************************************************/
1352
1353 static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
1354                                      const struct share_params *params,
1355                                      const bool is_directory,
1356                                                         const struct dom_sid *pfile_owner_sid,
1357                                                         const struct dom_sid *pfile_grp_sid,
1358                                                         const SMB_STRUCT_STAT *pst,
1359                                                         bool setting_acl)
1360 {
1361         canon_ace *pace;
1362         bool got_user = False;
1363         bool got_grp = False;
1364         bool got_other = False;
1365         canon_ace *pace_other = NULL;
1366
1367         for (pace = *pp_ace; pace; pace = pace->next) {
1368                 if (pace->type == SMB_ACL_USER_OBJ) {
1369
1370                         if (setting_acl)
1371                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1372                         got_user = True;
1373
1374                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1375
1376                         /*
1377                          * Ensure create mask/force create mode is respected on set.
1378                          */
1379
1380                         if (setting_acl)
1381                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1382                         got_grp = True;
1383
1384                 } else if (pace->type == SMB_ACL_OTHER) {
1385
1386                         /*
1387                          * Ensure create mask/force create mode is respected on set.
1388                          */
1389
1390                         if (setting_acl)
1391                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1392                         got_other = True;
1393                         pace_other = pace;
1394                 }
1395         }
1396
1397         if (!got_user) {
1398                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1399                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1400                         return False;
1401                 }
1402
1403                 ZERO_STRUCTP(pace);
1404                 pace->type = SMB_ACL_USER_OBJ;
1405                 pace->owner_type = UID_ACE;
1406                 pace->unix_ug.uid = pst->st_ex_uid;
1407                 pace->trustee = *pfile_owner_sid;
1408                 pace->attr = ALLOW_ACE;
1409
1410                 if (setting_acl) {
1411                         /* See if the owning user is in any of the other groups in
1412                            the ACE. If so, OR in the permissions from that group. */
1413
1414                         bool group_matched = False;
1415                         canon_ace *pace_iter;
1416
1417                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1418                                 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1419                                         if (uid_entry_in_group(conn, pace, pace_iter)) {
1420                                                 pace->perms |= pace_iter->perms;
1421                                                 group_matched = True;
1422                                         }
1423                                 }
1424                         }
1425
1426                         /* If we only got an "everyone" perm, just use that. */
1427                         if (!group_matched) {
1428                                 if (got_other)
1429                                         pace->perms = pace_other->perms;
1430                                 else
1431                                         pace->perms = 0;
1432                         }
1433
1434                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1435                 } else {
1436                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1437                 }
1438
1439                 DLIST_ADD(*pp_ace, pace);
1440         }
1441
1442         if (!got_grp) {
1443                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1444                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1445                         return False;
1446                 }
1447
1448                 ZERO_STRUCTP(pace);
1449                 pace->type = SMB_ACL_GROUP_OBJ;
1450                 pace->owner_type = GID_ACE;
1451                 pace->unix_ug.uid = pst->st_ex_gid;
1452                 pace->trustee = *pfile_grp_sid;
1453                 pace->attr = ALLOW_ACE;
1454                 if (setting_acl) {
1455                         /* If we only got an "everyone" perm, just use that. */
1456                         if (got_other)
1457                                 pace->perms = pace_other->perms;
1458                         else
1459                                 pace->perms = 0;
1460                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1461                 } else {
1462                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1463                 }
1464
1465                 DLIST_ADD(*pp_ace, pace);
1466         }
1467
1468         if (!got_other) {
1469                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1470                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1471                         return False;
1472                 }
1473
1474                 ZERO_STRUCTP(pace);
1475                 pace->type = SMB_ACL_OTHER;
1476                 pace->owner_type = WORLD_ACE;
1477                 pace->unix_ug.world = -1;
1478                 pace->trustee = global_sid_World;
1479                 pace->attr = ALLOW_ACE;
1480                 if (setting_acl) {
1481                         pace->perms = 0;
1482                         apply_default_perms(params, is_directory, pace, S_IROTH);
1483                 } else
1484                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1485
1486                 DLIST_ADD(*pp_ace, pace);
1487         }
1488
1489         return True;
1490 }
1491
1492 /****************************************************************************
1493  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1494  If it does not have them, check if there are any entries where the trustee is the
1495  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1496 ****************************************************************************/
1497
1498 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1499 {
1500         bool got_user_obj, got_group_obj;
1501         canon_ace *current_ace;
1502         int i, entries;
1503
1504         entries = count_canon_ace_list(ace);
1505         got_user_obj = False;
1506         got_group_obj = False;
1507
1508         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1509                 if (current_ace->type == SMB_ACL_USER_OBJ)
1510                         got_user_obj = True;
1511                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1512                         got_group_obj = True;
1513         }
1514         if (got_user_obj && got_group_obj) {
1515                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1516                 return;
1517         }
1518
1519         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1520                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1521                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1522                         current_ace->type = SMB_ACL_USER_OBJ;
1523                         got_user_obj = True;
1524                 }
1525                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1526                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1527                         current_ace->type = SMB_ACL_GROUP_OBJ;
1528                         got_group_obj = True;
1529                 }
1530         }
1531         if (!got_user_obj)
1532                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1533         if (!got_group_obj)
1534                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1535 }
1536
1537 /****************************************************************************
1538  If an ACE entry is SMB_ACL_USER_OBJ and not CREATOR_OWNER, map to SMB_ACL_USER.
1539  If an ACE entry is SMB_ACL_GROUP_OBJ and not CREATOR_GROUP, map to SMB_ACL_GROUP
1540 ****************************************************************************/
1541
1542 static bool dup_owning_ace(canon_ace *dir_ace, canon_ace *ace)
1543 {
1544         /* dir ace must be followings.
1545            SMB_ACL_USER_OBJ : trustee(CREATOR_OWNER) -> Posix ACL d:u::perm
1546            SMB_ACL_USER     : not trustee    -> Posix ACL u:user:perm
1547            SMB_ACL_USER_OBJ : trustee -> convert to SMB_ACL_USER : trustee
1548            Posix ACL u:trustee:perm
1549
1550            SMB_ACL_GROUP_OBJ: trustee(CREATOR_GROUP) -> Posix ACL d:g::perm
1551            SMB_ACL_GROUP    : not trustee   -> Posix ACL g:group:perm
1552            SMB_ACL_GROUP_OBJ: trustee -> convert to SMB_ACL_GROUP : trustee
1553            Posix ACL g:trustee:perm
1554         */
1555
1556         if (ace->type == SMB_ACL_USER_OBJ &&
1557                         !(dom_sid_equal(&ace->trustee, &global_sid_Creator_Owner))) {
1558                 canon_ace *dup_ace = dup_canon_ace(ace);
1559
1560                 if (dup_ace == NULL) {
1561                         return false;
1562                 }
1563                 dup_ace->type = SMB_ACL_USER;
1564                 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1565         }
1566
1567         if (ace->type == SMB_ACL_GROUP_OBJ &&
1568                         !(dom_sid_equal(&ace->trustee, &global_sid_Creator_Group))) {
1569                 canon_ace *dup_ace = dup_canon_ace(ace);
1570
1571                 if (dup_ace == NULL) {
1572                         return false;
1573                 }
1574                 dup_ace->type = SMB_ACL_GROUP;
1575                 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1576         }
1577
1578         return true;
1579 }
1580
1581 /****************************************************************************
1582  Unpack a struct security_descriptor into two canonical ace lists.
1583 ****************************************************************************/
1584
1585 static bool create_canon_ace_lists(files_struct *fsp,
1586                                         const SMB_STRUCT_STAT *pst,
1587                                         struct dom_sid *pfile_owner_sid,
1588                                         struct dom_sid *pfile_grp_sid,
1589                                         canon_ace **ppfile_ace,
1590                                         canon_ace **ppdir_ace,
1591                                         const struct security_acl *dacl)
1592 {
1593         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1594         canon_ace *file_ace = NULL;
1595         canon_ace *dir_ace = NULL;
1596         canon_ace *current_ace = NULL;
1597         bool got_dir_allow = False;
1598         bool got_file_allow = False;
1599         int i, j;
1600
1601         *ppfile_ace = NULL;
1602         *ppdir_ace = NULL;
1603
1604         /*
1605          * Convert the incoming ACL into a more regular form.
1606          */
1607
1608         for(i = 0; i < dacl->num_aces; i++) {
1609                 struct security_ace *psa = &dacl->aces[i];
1610
1611                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1612                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1613                         return False;
1614                 }
1615
1616                 if (nt4_compatible_acls()) {
1617                         /*
1618                          * The security mask may be UNIX_ACCESS_NONE which should map into
1619                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1620                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1621                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1622                          */
1623
1624                         /*
1625                          * Convert GENERIC bits to specific bits.
1626                          */
1627
1628                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1629
1630                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1631
1632                         if(psa->access_mask != UNIX_ACCESS_NONE)
1633                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1634                 }
1635         }
1636
1637         /*
1638          * Deal with the fact that NT 4.x re-writes the canonical format
1639          * that we return for default ACLs. If a directory ACE is identical
1640          * to a inherited directory ACE then NT changes the bits so that the
1641          * first ACE is set to OI|IO and the second ACE for this SID is set
1642          * to CI. We need to repair this. JRA.
1643          */
1644
1645         for(i = 0; i < dacl->num_aces; i++) {
1646                 struct security_ace *psa1 = &dacl->aces[i];
1647
1648                 for (j = i + 1; j < dacl->num_aces; j++) {
1649                         struct security_ace *psa2 = &dacl->aces[j];
1650
1651                         if (psa1->access_mask != psa2->access_mask)
1652                                 continue;
1653
1654                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1655                                 continue;
1656
1657                         /*
1658                          * Ok - permission bits and SIDs are equal.
1659                          * Check if flags were re-written.
1660                          */
1661
1662                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1663
1664                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1665                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1666
1667                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1668
1669                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1670                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1671
1672                         }
1673                 }
1674         }
1675
1676         for(i = 0; i < dacl->num_aces; i++) {
1677                 struct security_ace *psa = &dacl->aces[i];
1678
1679                 /*
1680                  * Create a canon_ace entry representing this NT DACL ACE.
1681                  */
1682
1683                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1684                         free_canon_ace_list(file_ace);
1685                         free_canon_ace_list(dir_ace);
1686                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1687                         return False;
1688                 }
1689
1690                 ZERO_STRUCTP(current_ace);
1691
1692                 sid_copy(&current_ace->trustee, &psa->trustee);
1693
1694                 /*
1695                  * Try and work out if the SID is a user or group
1696                  * as we need to flag these differently for POSIX.
1697                  * Note what kind of a POSIX ACL this should map to.
1698                  */
1699
1700                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1701                         current_ace->owner_type = WORLD_ACE;
1702                         current_ace->unix_ug.world = -1;
1703                         current_ace->type = SMB_ACL_OTHER;
1704                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1705                         current_ace->owner_type = UID_ACE;
1706                         current_ace->unix_ug.uid = pst->st_ex_uid;
1707                         current_ace->type = SMB_ACL_USER_OBJ;
1708
1709                         /*
1710                          * The Creator Owner entry only specifies inheritable permissions,
1711                          * never access permissions. WinNT doesn't always set the ACE to
1712                          * INHERIT_ONLY, though.
1713                          */
1714
1715                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1716
1717                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1718                         current_ace->owner_type = GID_ACE;
1719                         current_ace->unix_ug.gid = pst->st_ex_gid;
1720                         current_ace->type = SMB_ACL_GROUP_OBJ;
1721
1722                         /*
1723                          * The Creator Group entry only specifies inheritable permissions,
1724                          * never access permissions. WinNT doesn't always set the ACE to
1725                          * INHERIT_ONLY, though.
1726                          */
1727                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1728
1729                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1730                         current_ace->owner_type = UID_ACE;
1731                         /* If it's the owning user, this is a user_obj, not
1732                          * a user. */
1733                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1734                                 current_ace->type = SMB_ACL_USER_OBJ;
1735                         } else {
1736                                 current_ace->type = SMB_ACL_USER;
1737                         }
1738                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1739                         current_ace->owner_type = GID_ACE;
1740                         /* If it's the primary group, this is a group_obj, not
1741                          * a group. */
1742                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1743                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1744                         } else {
1745                                 current_ace->type = SMB_ACL_GROUP;
1746                         }
1747                 } else {
1748                         /*
1749                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1750                          */
1751
1752                         if (non_mappable_sid(&psa->trustee)) {
1753                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1754                                            "non-mappable SID %s\n",
1755                                            sid_string_dbg(&psa->trustee)));
1756                                 SAFE_FREE(current_ace);
1757                                 continue;
1758                         }
1759
1760                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1761                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1762                                         "unknown or foreign SID %s\n",
1763                                         sid_string_dbg(&psa->trustee)));
1764                                 SAFE_FREE(current_ace);
1765                                 continue;
1766                         }
1767
1768                         free_canon_ace_list(file_ace);
1769                         free_canon_ace_list(dir_ace);
1770                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1771                                   "%s to uid or gid.\n",
1772                                   sid_string_dbg(&current_ace->trustee)));
1773                         SAFE_FREE(current_ace);
1774                         return False;
1775                 }
1776
1777                 /*
1778                  * Map the given NT permissions into a UNIX mode_t containing only
1779                  * S_I(R|W|X)USR bits.
1780                  */
1781
1782                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1783                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1784
1785                 /* Store the ace_flag. */
1786                 current_ace->ace_flags = psa->flags;
1787
1788                 /*
1789                  * Now add the created ace to either the file list, the directory
1790                  * list, or both. We *MUST* preserve the order here (hence we use
1791                  * DLIST_ADD_END) as NT ACLs are order dependent.
1792                  */
1793
1794                 if (fsp->is_directory) {
1795
1796                         /*
1797                          * We can only add to the default POSIX ACE list if the ACE is
1798                          * designed to be inherited by both files and directories.
1799                          */
1800
1801                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1802                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1803
1804                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1805
1806                                 /*
1807                                  * Note if this was an allow ace. We can't process
1808                                  * any further deny ace's after this.
1809                                  */
1810
1811                                 if (current_ace->attr == ALLOW_ACE)
1812                                         got_dir_allow = True;
1813
1814                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1815                                         DEBUG(0,("create_canon_ace_lists: "
1816                                                  "malformed ACL in "
1817                                                  "inheritable ACL! Deny entry "
1818                                                  "after Allow entry. Failing "
1819                                                  "to set on file %s.\n",
1820                                                  fsp_str_dbg(fsp)));
1821                                         free_canon_ace_list(file_ace);
1822                                         free_canon_ace_list(dir_ace);
1823                                         return False;
1824                                 }
1825
1826                                 if( DEBUGLVL( 10 )) {
1827                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1828                                         print_canon_ace( current_ace, 0);
1829                                 }
1830
1831                                 /*
1832                                  * We have a lossy mapping: directory ACE entries
1833                                  * CREATOR_OWNER ------\
1834                                  *     (map to)         +---> SMB_ACL_USER_OBJ
1835                                  * owning sid    ------/
1836                                  *
1837                                  * CREATOR_GROUP ------\
1838                                  *     (map to)         +---> SMB_ACL_GROUP_OBJ
1839                                  * primary group sid --/
1840                                  *
1841                                  * on set. And on read of a directory ACL
1842                                  *
1843                                  * SMB_ACL_USER_OBJ ----> CREATOR_OWNER
1844                                  * SMB_ACL_GROUP_OBJ ---> CREATOR_GROUP.
1845                                  *
1846                                  * Deal with this on set by duplicating
1847                                  * owning sid and primary group sid ACE
1848                                  * entries into the directory ACL.
1849                                  * Fix from Tsukasa Hamano <hamano@osstech.co.jp>.
1850                                  */
1851
1852                                 if (!dup_owning_ace(dir_ace, current_ace)) {
1853                                         DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1854                                         free_canon_ace_list(file_ace);
1855                                         free_canon_ace_list(dir_ace);
1856                                         return false;
1857                                 }
1858
1859                                 /*
1860                                  * If this is not an inherit only ACE we need to add a duplicate
1861                                  * to the file acl.
1862                                  */
1863
1864                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1865                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1866
1867                                         if (!dup_ace) {
1868                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1869                                                 free_canon_ace_list(file_ace);
1870                                                 free_canon_ace_list(dir_ace);
1871                                                 return False;
1872                                         }
1873
1874                                         /*
1875                                          * We must not free current_ace here as its
1876                                          * pointer is now owned by the dir_ace list.
1877                                          */
1878                                         current_ace = dup_ace;
1879                                         /* We've essentially split this ace into two,
1880                                          * and added the ace with inheritance request
1881                                          * bits to the directory ACL. Drop those bits for
1882                                          * the ACE we're adding to the file list. */
1883                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1884                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1885                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1886                                 } else {
1887                                         /*
1888                                          * We must not free current_ace here as its
1889                                          * pointer is now owned by the dir_ace list.
1890                                          */
1891                                         current_ace = NULL;
1892                                 }
1893                         }
1894                 }
1895
1896                 /*
1897                  * Only add to the file ACL if not inherit only.
1898                  */
1899
1900                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1901                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1902
1903                         /*
1904                          * Note if this was an allow ace. We can't process
1905                          * any further deny ace's after this.
1906                          */
1907
1908                         if (current_ace->attr == ALLOW_ACE)
1909                                 got_file_allow = True;
1910
1911                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1912                                 DEBUG(0,("create_canon_ace_lists: malformed "
1913                                          "ACL in file ACL ! Deny entry after "
1914                                          "Allow entry. Failing to set on file "
1915                                          "%s.\n", fsp_str_dbg(fsp)));
1916                                 free_canon_ace_list(file_ace);
1917                                 free_canon_ace_list(dir_ace);
1918                                 return False;
1919                         }
1920
1921                         if( DEBUGLVL( 10 )) {
1922                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1923                                 print_canon_ace( current_ace, 0);
1924                         }
1925                         all_aces_are_inherit_only = False;
1926                         /*
1927                          * We must not free current_ace here as its
1928                          * pointer is now owned by the file_ace list.
1929                          */
1930                         current_ace = NULL;
1931                 }
1932
1933                 /*
1934                  * Free if ACE was not added.
1935                  */
1936
1937                 SAFE_FREE(current_ace);
1938         }
1939
1940         if (fsp->is_directory && all_aces_are_inherit_only) {
1941                 /*
1942                  * Windows 2000 is doing one of these weird 'inherit acl'
1943                  * traverses to conserve NTFS ACL resources. Just pretend
1944                  * there was no DACL sent. JRA.
1945                  */
1946
1947                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1948                 free_canon_ace_list(file_ace);
1949                 free_canon_ace_list(dir_ace);
1950                 file_ace = NULL;
1951                 dir_ace = NULL;
1952         } else {
1953                 /*
1954                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1955                  * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1956                  * entries can be converted to *_OBJ. Usually we will already have these
1957                  * entries in the Default ACL, and the Access ACL will not have them.
1958                  */
1959                 if (file_ace) {
1960                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1961                 }
1962                 if (dir_ace) {
1963                         check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1964                 }
1965         }
1966
1967         *ppfile_ace = file_ace;
1968         *ppdir_ace = dir_ace;
1969
1970         return True;
1971 }
1972
1973 /****************************************************************************
1974  ASCII art time again... JRA :-).
1975
1976  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1977  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1978  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1979  allow or deny have been merged, so the same SID can only appear once in the deny
1980  list or once in the allow list.
1981
1982  We then process as follows :
1983
1984  ---------------------------------------------------------------------------
1985  First pass - look for a Everyone DENY entry.
1986
1987  If it is deny all (rwx) trunate the list at this point.
1988  Else, walk the list from this point and use the deny permissions of this
1989  entry as a mask on all following allow entries. Finally, delete
1990  the Everyone DENY entry (we have applied it to everything possible).
1991
1992  In addition, in this pass we remove any DENY entries that have
1993  no permissions (ie. they are a DENY nothing).
1994  ---------------------------------------------------------------------------
1995  Second pass - only deal with deny user entries.
1996
1997  DENY user1 (perms XXX)
1998
1999  new_perms = 0
2000  for all following allow group entries where user1 is in group
2001         new_perms |= group_perms;
2002
2003  user1 entry perms = new_perms & ~ XXX;
2004
2005  Convert the deny entry to an allow entry with the new perms and
2006  push to the end of the list. Note if the user was in no groups
2007  this maps to a specific allow nothing entry for this user.
2008
2009  The common case from the NT ACL choser (userX deny all) is
2010  optimised so we don't do the group lookup - we just map to
2011  an allow nothing entry.
2012
2013  What we're doing here is inferring the allow permissions the
2014  person setting the ACE on user1 wanted by looking at the allow
2015  permissions on the groups the user is currently in. This will
2016  be a snapshot, depending on group membership but is the best
2017  we can do and has the advantage of failing closed rather than
2018  open.
2019  ---------------------------------------------------------------------------
2020  Third pass - only deal with deny group entries.
2021
2022  DENY group1 (perms XXX)
2023
2024  for all following allow user entries where user is in group1
2025    user entry perms = user entry perms & ~ XXX;
2026
2027  If there is a group Everyone allow entry with permissions YYY,
2028  convert the group1 entry to an allow entry and modify its
2029  permissions to be :
2030
2031  new_perms = YYY & ~ XXX
2032
2033  and push to the end of the list.
2034
2035  If there is no group Everyone allow entry then convert the
2036  group1 entry to a allow nothing entry and push to the end of the list.
2037
2038  Note that the common case from the NT ACL choser (groupX deny all)
2039  cannot be optimised here as we need to modify user entries who are
2040  in the group to change them to a deny all also.
2041
2042  What we're doing here is modifying the allow permissions of
2043  user entries (which are more specific in POSIX ACLs) to mask
2044  out the explicit deny set on the group they are in. This will
2045  be a snapshot depending on current group membership but is the
2046  best we can do and has the advantage of failing closed rather
2047  than open.
2048  ---------------------------------------------------------------------------
2049  Fourth pass - cope with cumulative permissions.
2050
2051  for all allow user entries, if there exists an allow group entry with
2052  more permissive permissions, and the user is in that group, rewrite the
2053  allow user permissions to contain both sets of permissions.
2054
2055  Currently the code for this is #ifdef'ed out as these semantics make
2056  no sense to me. JRA.
2057  ---------------------------------------------------------------------------
2058
2059  Note we *MUST* do the deny user pass first as this will convert deny user
2060  entries into allow user entries which can then be processed by the deny
2061  group pass.
2062
2063  The above algorithm took a *lot* of thinking about - hence this
2064  explaination :-). JRA.
2065 ****************************************************************************/
2066
2067 /****************************************************************************
2068  Process a canon_ace list entries. This is very complex code. We need
2069  to go through and remove the "deny" permissions from any allow entry that matches
2070  the id of this entry. We have already refused any NT ACL that wasn't in correct
2071  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2072  we just remove it (to fail safe). We have already removed any duplicate ace
2073  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2074  allow entries.
2075 ****************************************************************************/
2076
2077 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2078 {
2079         canon_ace *ace_list = *pp_ace_list;
2080         canon_ace *curr_ace = NULL;
2081         canon_ace *curr_ace_next = NULL;
2082
2083         /* Pass 1 above - look for an Everyone, deny entry. */
2084
2085         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2086                 canon_ace *allow_ace_p;
2087
2088                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2089
2090                 if (curr_ace->attr != DENY_ACE)
2091                         continue;
2092
2093                 if (curr_ace->perms == (mode_t)0) {
2094
2095                         /* Deny nothing entry - delete. */
2096
2097                         DLIST_REMOVE(ace_list, curr_ace);
2098                         continue;
2099                 }
2100
2101                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2102                         continue;
2103
2104                 /* JRATEST - assert. */
2105                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2106
2107                 if (curr_ace->perms == ALL_ACE_PERMS) {
2108
2109                         /*
2110                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2111                          * list at this point including this entry.
2112                          */
2113
2114                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2115
2116                         free_canon_ace_list( curr_ace );
2117                         if (prev_entry)
2118                                 DLIST_REMOVE(ace_list, prev_entry);
2119                         else {
2120                                 /* We deleted the entire list. */
2121                                 ace_list = NULL;
2122                         }
2123                         break;
2124                 }
2125
2126                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2127
2128                         /*
2129                          * Only mask off allow entries.
2130                          */
2131
2132                         if (allow_ace_p->attr != ALLOW_ACE)
2133                                 continue;
2134
2135                         allow_ace_p->perms &= ~curr_ace->perms;
2136                 }
2137
2138                 /*
2139                  * Now it's been applied, remove it.
2140                  */
2141
2142                 DLIST_REMOVE(ace_list, curr_ace);
2143         }
2144
2145         /* Pass 2 above - deal with deny user entries. */
2146
2147         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2148                 mode_t new_perms = (mode_t)0;
2149                 canon_ace *allow_ace_p;
2150
2151                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2152
2153                 if (curr_ace->attr != DENY_ACE)
2154                         continue;
2155
2156                 if (curr_ace->owner_type != UID_ACE)
2157                         continue;
2158
2159                 if (curr_ace->perms == ALL_ACE_PERMS) {
2160
2161                         /*
2162                          * Optimisation - this is a deny everything to this user.
2163                          * Convert to an allow nothing and push to the end of the list.
2164                          */
2165
2166                         curr_ace->attr = ALLOW_ACE;
2167                         curr_ace->perms = (mode_t)0;
2168                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2169                         continue;
2170                 }
2171
2172                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2173
2174                         if (allow_ace_p->attr != ALLOW_ACE)
2175                                 continue;
2176
2177                         /* We process GID_ACE and WORLD_ACE entries only. */
2178
2179                         if (allow_ace_p->owner_type == UID_ACE)
2180                                 continue;
2181
2182                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2183                                 new_perms |= allow_ace_p->perms;
2184                 }
2185
2186                 /*
2187                  * Convert to a allow entry, modify the perms and push to the end
2188                  * of the list.
2189                  */
2190
2191                 curr_ace->attr = ALLOW_ACE;
2192                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2193                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2194         }
2195
2196         /* Pass 3 above - deal with deny group entries. */
2197
2198         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2199                 canon_ace *allow_ace_p;
2200                 canon_ace *allow_everyone_p = NULL;
2201
2202                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2203
2204                 if (curr_ace->attr != DENY_ACE)
2205                         continue;
2206
2207                 if (curr_ace->owner_type != GID_ACE)
2208                         continue;
2209
2210                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2211
2212                         if (allow_ace_p->attr != ALLOW_ACE)
2213                                 continue;
2214
2215                         /* Store a pointer to the Everyone allow, if it exists. */
2216                         if (allow_ace_p->owner_type == WORLD_ACE)
2217                                 allow_everyone_p = allow_ace_p;
2218
2219                         /* We process UID_ACE entries only. */
2220
2221                         if (allow_ace_p->owner_type != UID_ACE)
2222                                 continue;
2223
2224                         /* Mask off the deny group perms. */
2225
2226                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2227                                 allow_ace_p->perms &= ~curr_ace->perms;
2228                 }
2229
2230                 /*
2231                  * Convert the deny to an allow with the correct perms and
2232                  * push to the end of the list.
2233                  */
2234
2235                 curr_ace->attr = ALLOW_ACE;
2236                 if (allow_everyone_p)
2237                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2238                 else
2239                         curr_ace->perms = (mode_t)0;
2240                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2241         }
2242
2243         /* Doing this fourth pass allows Windows semantics to be layered
2244          * on top of POSIX semantics. I'm not sure if this is desirable.
2245          * For example, in W2K ACLs there is no way to say, "Group X no
2246          * access, user Y full access" if user Y is a member of group X.
2247          * This seems completely broken semantics to me.... JRA.
2248          */
2249
2250 #if 0
2251         /* Pass 4 above - deal with allow entries. */
2252
2253         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2254                 canon_ace *allow_ace_p;
2255
2256                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2257
2258                 if (curr_ace->attr != ALLOW_ACE)
2259                         continue;
2260
2261                 if (curr_ace->owner_type != UID_ACE)
2262                         continue;
2263
2264                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2265
2266                         if (allow_ace_p->attr != ALLOW_ACE)
2267                                 continue;
2268
2269                         /* We process GID_ACE entries only. */
2270
2271                         if (allow_ace_p->owner_type != GID_ACE)
2272                                 continue;
2273
2274                         /* OR in the group perms. */
2275
2276                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2277                                 curr_ace->perms |= allow_ace_p->perms;
2278                 }
2279         }
2280 #endif
2281
2282         *pp_ace_list = ace_list;
2283 }
2284
2285 /****************************************************************************
2286  Create a default mode that will be used if a security descriptor entry has
2287  no user/group/world entries.
2288 ****************************************************************************/
2289
2290 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2291 {
2292         int snum = SNUM(fsp->conn);
2293         mode_t and_bits = (mode_t)0;
2294         mode_t or_bits = (mode_t)0;
2295         mode_t mode;
2296
2297         if (interitable_mode) {
2298                 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2299                                  fsp->fsp_name, NULL);
2300         } else {
2301                 mode = S_IRUSR;
2302         }
2303
2304         if (fsp->is_directory)
2305                 mode |= (S_IWUSR|S_IXUSR);
2306
2307         /*
2308          * Now AND with the create mode/directory mode bits then OR with the
2309          * force create mode/force directory mode bits.
2310          */
2311
2312         if (fsp->is_directory) {
2313                 and_bits = lp_dir_security_mask(snum);
2314                 or_bits = lp_force_dir_security_mode(snum);
2315         } else {
2316                 and_bits = lp_security_mask(snum);
2317                 or_bits = lp_force_security_mode(snum);
2318         }
2319
2320         return ((mode & and_bits)|or_bits);
2321 }
2322
2323 /****************************************************************************
2324  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2325  succeeding.
2326 ****************************************************************************/
2327
2328 static bool unpack_canon_ace(files_struct *fsp,
2329                                 const SMB_STRUCT_STAT *pst,
2330                                 struct dom_sid *pfile_owner_sid,
2331                                 struct dom_sid *pfile_grp_sid,
2332                                 canon_ace **ppfile_ace,
2333                                 canon_ace **ppdir_ace,
2334                                 uint32 security_info_sent,
2335                                 const struct security_descriptor *psd)
2336 {
2337         SMB_STRUCT_STAT st;
2338         canon_ace *file_ace = NULL;
2339         canon_ace *dir_ace = NULL;
2340
2341         *ppfile_ace = NULL;
2342         *ppdir_ace = NULL;
2343
2344         if(security_info_sent == 0) {
2345                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2346                 return False;
2347         }
2348
2349         /*
2350          * If no DACL then this is a chown only security descriptor.
2351          */
2352
2353         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2354                 return True;
2355
2356         /*
2357          * Now go through the DACL and create the canon_ace lists.
2358          */
2359
2360         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2361                                                                 &file_ace, &dir_ace, psd->dacl))
2362                 return False;
2363
2364         if ((file_ace == NULL) && (dir_ace == NULL)) {
2365                 /* W2K traverse DACL set - ignore. */
2366                 return True;
2367         }
2368
2369         /*
2370          * Go through the canon_ace list and merge entries
2371          * belonging to identical users of identical allow or deny type.
2372          * We can do this as all deny entries come first, followed by
2373          * all allow entries (we have mandated this before accepting this acl).
2374          */
2375
2376         print_canon_ace_list( "file ace - before merge", file_ace);
2377         merge_aces( &file_ace, false);
2378
2379         print_canon_ace_list( "dir ace - before merge", dir_ace);
2380         merge_aces( &dir_ace, true);
2381
2382         /*
2383          * NT ACLs are order dependent. Go through the acl lists and
2384          * process DENY entries by masking the allow entries.
2385          */
2386
2387         print_canon_ace_list( "file ace - before deny", file_ace);
2388         process_deny_list(fsp->conn, &file_ace);
2389
2390         print_canon_ace_list( "dir ace - before deny", dir_ace);
2391         process_deny_list(fsp->conn, &dir_ace);
2392
2393         /*
2394          * A well formed POSIX file or default ACL has at least 3 entries, a
2395          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2396          * and optionally a mask entry. Ensure this is the case.
2397          */
2398
2399         print_canon_ace_list( "file ace - before valid", file_ace);
2400
2401         st = *pst;
2402
2403         /*
2404          * A default 3 element mode entry for a file should be r-- --- ---.
2405          * A default 3 element mode entry for a directory should be rwx --- ---.
2406          */
2407
2408         st.st_ex_mode = create_default_mode(fsp, False);
2409
2410         if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2411                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2412                 free_canon_ace_list(file_ace);
2413                 free_canon_ace_list(dir_ace);
2414                 return False;
2415         }
2416
2417         print_canon_ace_list( "dir ace - before valid", dir_ace);
2418
2419         /*
2420          * A default inheritable 3 element mode entry for a directory should be the
2421          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2422          * it's a directory.
2423          */
2424
2425         st.st_ex_mode = create_default_mode(fsp, True);
2426
2427         if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2428                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2429                 free_canon_ace_list(file_ace);
2430                 free_canon_ace_list(dir_ace);
2431                 return False;
2432         }
2433
2434         print_canon_ace_list( "file ace - return", file_ace);
2435         print_canon_ace_list( "dir ace - return", dir_ace);
2436
2437         *ppfile_ace = file_ace;
2438         *ppdir_ace = dir_ace;
2439         return True;
2440
2441 }
2442
2443 /******************************************************************************
2444  When returning permissions, try and fit NT display
2445  semantics if possible. Note the the canon_entries here must have been malloced.
2446  The list format should be - first entry = owner, followed by group and other user
2447  entries, last entry = other.
2448
2449  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2450  are not ordered, and match on the most specific entry rather than walking a list,
2451  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2452
2453  Entry 0: owner : deny all except read and write.
2454  Entry 1: owner : allow read and write.
2455  Entry 2: group : deny all except read.
2456  Entry 3: group : allow read.
2457  Entry 4: Everyone : allow read.
2458
2459  But NT cannot display this in their ACL editor !
2460 ********************************************************************************/
2461
2462 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2463 {
2464         canon_ace *l_head = *pp_list_head;
2465         canon_ace *owner_ace = NULL;
2466         canon_ace *other_ace = NULL;
2467         canon_ace *ace = NULL;
2468
2469         for (ace = l_head; ace; ace = ace->next) {
2470                 if (ace->type == SMB_ACL_USER_OBJ)
2471                         owner_ace = ace;
2472                 else if (ace->type == SMB_ACL_OTHER) {
2473                         /* Last ace - this is "other" */
2474                         other_ace = ace;
2475                 }
2476         }
2477
2478         if (!owner_ace || !other_ace) {
2479                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2480                         filename ));
2481                 return;
2482         }
2483
2484         /*
2485          * The POSIX algorithm applies to owner first, and other last,
2486          * so ensure they are arranged in this order.
2487          */
2488
2489         if (owner_ace) {
2490                 DLIST_PROMOTE(l_head, owner_ace);
2491         }
2492
2493         if (other_ace) {
2494                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2495         }
2496
2497         /* We have probably changed the head of the list. */
2498
2499         *pp_list_head = l_head;
2500 }
2501
2502 /****************************************************************************
2503  Create a linked list of canonical ACE entries.
2504 ****************************************************************************/
2505
2506 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2507                                    const char *fname, SMB_ACL_T posix_acl,
2508                                    const SMB_STRUCT_STAT *psbuf,
2509                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2510 {
2511         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2512         canon_ace *l_head = NULL;
2513         canon_ace *ace = NULL;
2514         canon_ace *next_ace = NULL;
2515         int entry_id = SMB_ACL_FIRST_ENTRY;
2516         SMB_ACL_ENTRY_T entry;
2517         size_t ace_count;
2518
2519         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2520                 SMB_ACL_TAG_T tagtype;
2521                 SMB_ACL_PERMSET_T permset;
2522                 struct dom_sid sid;
2523                 posix_id unix_ug;
2524                 enum ace_owner owner_type;
2525
2526                 entry_id = SMB_ACL_NEXT_ENTRY;
2527
2528                 /* Is this a MASK entry ? */
2529                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2530                         continue;
2531
2532                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2533                         continue;
2534
2535                 /* Decide which SID to use based on the ACL type. */
2536                 switch(tagtype) {
2537                         case SMB_ACL_USER_OBJ:
2538                                 /* Get the SID from the owner. */
2539                                 sid_copy(&sid, powner);
2540                                 unix_ug.uid = psbuf->st_ex_uid;
2541                                 owner_type = UID_ACE;
2542                                 break;
2543                         case SMB_ACL_USER:
2544                                 {
2545                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2546                                         if (puid == NULL) {
2547                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2548                                                 continue;
2549                                         }
2550                                         uid_to_sid( &sid, *puid);
2551                                         unix_ug.uid = *puid;
2552                                         owner_type = UID_ACE;
2553                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2554                                         break;
2555                                 }
2556                         case SMB_ACL_GROUP_OBJ:
2557                                 /* Get the SID from the owning group. */
2558                                 sid_copy(&sid, pgroup);
2559                                 unix_ug.gid = psbuf->st_ex_gid;
2560                                 owner_type = GID_ACE;
2561                                 break;
2562                         case SMB_ACL_GROUP:
2563                                 {
2564                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2565                                         if (pgid == NULL) {
2566                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2567                                                 continue;
2568                                         }
2569                                         gid_to_sid( &sid, *pgid);
2570                                         unix_ug.gid = *pgid;
2571                                         owner_type = GID_ACE;
2572                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2573                                         break;
2574                                 }
2575                         case SMB_ACL_MASK:
2576                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2577                                 continue; /* Don't count the mask as an entry. */
2578                         case SMB_ACL_OTHER:
2579                                 /* Use the Everyone SID */
2580                                 sid = global_sid_World;
2581                                 unix_ug.world = -1;
2582                                 owner_type = WORLD_ACE;
2583                                 break;
2584                         default:
2585                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2586                                 continue;
2587                 }
2588
2589                 /*
2590                  * Add this entry to the list.
2591                  */
2592
2593                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2594                         goto fail;
2595
2596                 ZERO_STRUCTP(ace);
2597                 ace->type = tagtype;
2598                 ace->perms = convert_permset_to_mode_t(conn, permset);
2599                 ace->attr = ALLOW_ACE;
2600                 ace->trustee = sid;
2601                 ace->unix_ug = unix_ug;
2602                 ace->owner_type = owner_type;
2603                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2604
2605                 DLIST_ADD(l_head, ace);
2606         }
2607
2608         /*
2609          * This next call will ensure we have at least a user/group/world set.
2610          */
2611
2612         if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2613                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2614                                       psbuf, False))
2615                 goto fail;
2616
2617         /*
2618          * Now go through the list, masking the permissions with the
2619          * acl_mask. Ensure all DENY Entries are at the start of the list.
2620          */
2621
2622         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2623
2624         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2625                 next_ace = ace->next;
2626
2627                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2628                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2629                         ace->perms &= acl_mask;
2630
2631                 if (ace->perms == 0) {
2632                         DLIST_PROMOTE(l_head, ace);
2633                 }
2634
2635                 if( DEBUGLVL( 10 ) ) {
2636                         print_canon_ace(ace, ace_count);
2637                 }
2638         }
2639
2640         arrange_posix_perms(fname,&l_head );
2641
2642         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2643
2644         return l_head;
2645
2646   fail:
2647
2648         free_canon_ace_list(l_head);
2649         return NULL;
2650 }
2651
2652 /****************************************************************************
2653  Check if the current user group list contains a given group.
2654 ****************************************************************************/
2655
2656 static bool current_user_in_group(connection_struct *conn, gid_t gid)
2657 {
2658         int i;
2659         const struct security_unix_token *utok = get_current_utok(conn);
2660
2661         for (i = 0; i < utok->ngroups; i++) {
2662                 if (utok->groups[i] == gid) {
2663                         return True;
2664                 }
2665         }
2666
2667         return False;
2668 }
2669
2670 /****************************************************************************
2671  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2672 ****************************************************************************/
2673
2674 static bool acl_group_override(connection_struct *conn,
2675                                const struct smb_filename *smb_fname)
2676 {
2677         if ((errno != EPERM) && (errno != EACCES)) {
2678                 return false;
2679         }
2680
2681         /* file primary group == user primary or supplementary group */
2682         if (lp_acl_group_control(SNUM(conn)) &&
2683             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2684                 return true;
2685         }
2686
2687         /* user has writeable permission */
2688         if (lp_dos_filemode(SNUM(conn)) &&
2689             can_write_to_file(conn, smb_fname)) {
2690                 return true;
2691         }
2692
2693         return false;
2694 }
2695
2696 /****************************************************************************
2697  Attempt to apply an ACL to a file or directory.
2698 ****************************************************************************/
2699
2700 static bool set_canon_ace_list(files_struct *fsp,
2701                                 canon_ace *the_ace,
2702                                 bool default_ace,
2703                                 const SMB_STRUCT_STAT *psbuf,
2704                                 bool *pacl_set_support)
2705 {
2706         connection_struct *conn = fsp->conn;
2707         bool ret = False;
2708         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2709         canon_ace *p_ace;
2710         int i;
2711         SMB_ACL_ENTRY_T mask_entry;
2712         bool got_mask_entry = False;
2713         SMB_ACL_PERMSET_T mask_permset;
2714         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2715         bool needs_mask = False;
2716         mode_t mask_perms = 0;
2717
2718         /* Use the psbuf that was passed in. */
2719         if (psbuf != &fsp->fsp_name->st) {
2720                 fsp->fsp_name->st = *psbuf;
2721         }
2722
2723 #if defined(POSIX_ACL_NEEDS_MASK)
2724         /* HP-UX always wants to have a mask (called "class" there). */
2725         needs_mask = True;
2726 #endif
2727
2728         if (the_acl == NULL) {
2729
2730                 if (!no_acl_syscall_error(errno)) {
2731                         /*
2732                          * Only print this error message if we have some kind of ACL
2733                          * support that's not working. Otherwise we would always get this.
2734                          */
2735                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2736                                 default_ace ? "default" : "file", strerror(errno) ));
2737                 }
2738                 *pacl_set_support = False;
2739                 goto fail;
2740         }
2741
2742         if( DEBUGLVL( 10 )) {
2743                 dbgtext("set_canon_ace_list: setting ACL:\n");
2744                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2745                         print_canon_ace( p_ace, i);
2746                 }
2747         }
2748
2749         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2750                 SMB_ACL_ENTRY_T the_entry;
2751                 SMB_ACL_PERMSET_T the_permset;
2752
2753                 /*
2754                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2755                  * named group entries. But if there is an ACL_MASK entry, it applies
2756                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2757                  * so that it doesn't deny (i.e., mask off) any permissions.
2758                  */
2759
2760                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2761                         needs_mask = True;
2762                         mask_perms |= p_ace->perms;
2763                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2764                         mask_perms |= p_ace->perms;
2765                 }
2766
2767                 /*
2768                  * Get the entry for this ACE.
2769                  */
2770
2771                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2772                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2773                                 i, strerror(errno) ));
2774                         goto fail;
2775                 }
2776
2777                 if (p_ace->type == SMB_ACL_MASK) {
2778                         mask_entry = the_entry;
2779                         got_mask_entry = True;
2780                 }
2781
2782                 /*
2783                  * Ok - we now know the ACL calls should be working, don't
2784                  * allow fallback to chmod.
2785                  */
2786
2787                 *pacl_set_support = True;
2788
2789                 /*
2790                  * Initialise the entry from the canon_ace.
2791                  */
2792
2793                 /*
2794                  * First tell the entry what type of ACE this is.
2795                  */
2796
2797                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2798                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2799                                 i, strerror(errno) ));
2800                         goto fail;
2801                 }
2802
2803                 /*
2804                  * Only set the qualifier (user or group id) if the entry is a user
2805                  * or group id ACE.
2806                  */
2807
2808                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2809                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2810                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2811                                         i, strerror(errno) ));
2812                                 goto fail;
2813                         }
2814                 }
2815
2816                 /*
2817                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2818                  */
2819
2820                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2821                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2822                                 i, strerror(errno) ));
2823                         goto fail;
2824                 }
2825
2826                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2827                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2828                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2829                         goto fail;
2830                 }
2831
2832                 /*
2833                  * ..and apply them to the entry.
2834                  */
2835
2836                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2837                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2838                                 i, strerror(errno) ));
2839                         goto fail;
2840                 }
2841
2842                 if( DEBUGLVL( 10 ))
2843                         print_canon_ace( p_ace, i);
2844
2845         }
2846
2847         if (needs_mask && !got_mask_entry) {
2848                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2849                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2850                         goto fail;
2851                 }
2852
2853                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2854                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2855                         goto fail;
2856                 }
2857
2858                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2859                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2860                         goto fail;
2861                 }
2862
2863                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2864                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2865                         goto fail;
2866                 }
2867
2868                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2869                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2870                         goto fail;
2871                 }
2872         }
2873
2874         /*
2875          * Finally apply it to the file or directory.
2876          */
2877
2878         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2879                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2880                                              the_acl_type, the_acl) == -1) {
2881                         /*
2882                          * Some systems allow all the above calls and only fail with no ACL support
2883                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2884                          */
2885                         if (no_acl_syscall_error(errno)) {
2886                                 *pacl_set_support = False;
2887                         }
2888
2889                         if (acl_group_override(conn, fsp->fsp_name)) {
2890                                 int sret;
2891
2892                                 DEBUG(5,("set_canon_ace_list: acl group "
2893                                          "control on and current user in file "
2894                                          "%s primary group.\n",
2895                                          fsp_str_dbg(fsp)));
2896
2897                                 become_root();
2898                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2899                                     fsp->fsp_name->base_name, the_acl_type,
2900                                     the_acl);
2901                                 unbecome_root();
2902                                 if (sret == 0) {
2903                                         ret = True;
2904                                 }
2905                         }
2906
2907                         if (ret == False) {
2908                                 DEBUG(2,("set_canon_ace_list: "
2909                                          "sys_acl_set_file type %s failed for "
2910                                          "file %s (%s).\n",
2911                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2912                                          "directory default" : "file",
2913                                          fsp_str_dbg(fsp), strerror(errno)));
2914                                 goto fail;
2915                         }
2916                 }
2917         } else {
2918                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2919                         /*
2920                          * Some systems allow all the above calls and only fail with no ACL support
2921                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2922                          */
2923                         if (no_acl_syscall_error(errno)) {
2924                                 *pacl_set_support = False;
2925                         }
2926
2927                         if (acl_group_override(conn, fsp->fsp_name)) {
2928                                 int sret;
2929
2930                                 DEBUG(5,("set_canon_ace_list: acl group "
2931                                          "control on and current user in file "
2932                                          "%s primary group.\n",
2933                                          fsp_str_dbg(fsp)));
2934
2935                                 become_root();
2936                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2937                                 unbecome_root();
2938                                 if (sret == 0) {
2939                                         ret = True;
2940                                 }
2941                         }
2942
2943                         if (ret == False) {
2944                                 DEBUG(2,("set_canon_ace_list: "
2945                                          "sys_acl_set_file failed for file %s "
2946                                          "(%s).\n",
2947                                          fsp_str_dbg(fsp), strerror(errno)));
2948                                 goto fail;
2949                         }
2950                 }
2951         }
2952
2953         ret = True;
2954
2955   fail:
2956
2957         if (the_acl != NULL) {
2958                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2959         }
2960
2961         return ret;
2962 }
2963
2964 /****************************************************************************
2965  Find a particular canon_ace entry.
2966 ****************************************************************************/
2967
2968 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2969 {
2970         while (list) {
2971                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2972                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2973                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2974                         break;
2975                 list = list->next;
2976         }
2977         return list;
2978 }
2979
2980 /****************************************************************************
2981
2982 ****************************************************************************/
2983
2984 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2985 {
2986         SMB_ACL_ENTRY_T entry;
2987
2988         if (!the_acl)
2989                 return NULL;
2990         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2991                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2992                 return NULL;
2993         }
2994         return the_acl;
2995 }
2996
2997 /****************************************************************************
2998  Convert a canon_ace to a generic 3 element permission - if possible.
2999 ****************************************************************************/
3000
3001 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3002
3003 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3004 {
3005         int snum = SNUM(fsp->conn);
3006         size_t ace_count = count_canon_ace_list(file_ace_list);
3007         canon_ace *ace_p;
3008         canon_ace *owner_ace = NULL;
3009         canon_ace *group_ace = NULL;
3010         canon_ace *other_ace = NULL;
3011         mode_t and_bits;
3012         mode_t or_bits;
3013
3014         if (ace_count != 3) {
3015                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3016                          "entries for file %s to convert to posix perms.\n",
3017                          fsp_str_dbg(fsp)));
3018                 return False;
3019         }
3020
3021         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3022                 if (ace_p->owner_type == UID_ACE)
3023                         owner_ace = ace_p;
3024                 else if (ace_p->owner_type == GID_ACE)
3025                         group_ace = ace_p;
3026                 else if (ace_p->owner_type == WORLD_ACE)
3027                         other_ace = ace_p;
3028         }
3029
3030         if (!owner_ace || !group_ace || !other_ace) {
3031                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3032                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3033                 return False;
3034         }
3035
3036         *posix_perms = (mode_t)0;
3037
3038         *posix_perms |= owner_ace->perms;
3039         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3040         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3041         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3042         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3043         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3044         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3045
3046         /* The owner must have at least read access. */
3047
3048         *posix_perms |= S_IRUSR;
3049         if (fsp->is_directory)
3050                 *posix_perms |= (S_IWUSR|S_IXUSR);
3051
3052         /* If requested apply the masks. */
3053
3054         /* Get the initial bits to apply. */
3055
3056         if (fsp->is_directory) {
3057                 and_bits = lp_dir_security_mask(snum);
3058                 or_bits = lp_force_dir_security_mode(snum);
3059         } else {
3060                 and_bits = lp_security_mask(snum);
3061                 or_bits = lp_force_security_mode(snum);
3062         }
3063
3064         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3065
3066         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3067                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3068                   (int)group_ace->perms, (int)other_ace->perms,
3069                   (int)*posix_perms, fsp_str_dbg(fsp)));
3070
3071         return True;
3072 }
3073
3074 /****************************************************************************
3075   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3076   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3077   with CI|OI set so it is inherited and also applies to the directory.
3078   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3079 ****************************************************************************/
3080
3081 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3082 {
3083         size_t i, j;
3084
3085         for (i = 0; i < num_aces; i++) {
3086                 for (j = i+1; j < num_aces; j++) {
3087                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3088                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3089                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3090                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3091
3092                         /* We know the lower number ACE's are file entries. */
3093                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3094                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3095                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3096                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3097                                 (i_inh == j_inh) &&
3098                                 (i_flags_ni == 0) &&
3099                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3100                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3101                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3102                                 /*
3103                                  * W2K wants to have access allowed zero access ACE's
3104                                  * at the end of the list. If the mask is zero, merge
3105                                  * the non-inherited ACE onto the inherited ACE.
3106                                  */
3107
3108                                 if (nt_ace_list[i].access_mask == 0) {
3109                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3110                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3111                                         if (num_aces - i - 1 > 0)
3112                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3113                                                                 sizeof(struct security_ace));
3114
3115                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3116                                                 (unsigned int)i, (unsigned int)j ));
3117                                 } else {
3118                                         /*
3119                                          * These are identical except for the flags.
3120                                          * Merge the inherited ACE onto the non-inherited ACE.
3121                                          */
3122
3123                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3124                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3125                                         if (num_aces - j - 1 > 0)
3126                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3127                                                                 sizeof(struct security_ace));
3128
3129                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3130                                                 (unsigned int)j, (unsigned int)i ));
3131                                 }
3132                                 num_aces--;
3133                                 break;
3134                         }
3135                 }
3136         }
3137
3138         return num_aces;
3139 }
3140
3141 /*
3142  * Add or Replace ACE entry.
3143  * In some cases we need to add a specific ACE for compatibility reasons.
3144  * When doing that we must make sure we are not actually creating a duplicate
3145  * entry. So we need to search whether an ACE entry already exist and eventually
3146  * replacce the access mask, or add a completely new entry if none was found.
3147  *
3148  * This function assumes the array has enough space to add a new entry without
3149  * any reallocation of memory.
3150  */
3151
3152 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3153                                 const struct dom_sid *sid, enum security_ace_type type,
3154                                 uint32_t mask, uint8_t flags)
3155 {
3156         int i;
3157
3158         /* first search for a duplicate */
3159         for (i = 0; i < *num_aces; i++) {
3160                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3161                     (nt_ace_list[i].flags == flags)) break;
3162         }
3163
3164         if (i < *num_aces) { /* found */
3165                 nt_ace_list[i].type = type;
3166                 nt_ace_list[i].access_mask = mask;
3167                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3168                            i, sid_string_dbg(sid), flags));
3169                 return;
3170         }
3171
3172         /* not found, append it */
3173         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3174 }
3175
3176
3177 /****************************************************************************
3178  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3179  the space for the return elements and returns the size needed to return the
3180  security descriptor. This should be the only external function needed for
3181  the UNIX style get ACL.
3182 ****************************************************************************/
3183
3184 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3185                                       const char *name,
3186                                       const SMB_STRUCT_STAT *sbuf,
3187                                       struct pai_val *pal,
3188                                       SMB_ACL_T posix_acl,
3189                                       SMB_ACL_T def_acl,
3190                                       uint32_t security_info,
3191                                       struct security_descriptor **ppdesc)
3192 {
3193         struct dom_sid owner_sid;
3194         struct dom_sid group_sid;
3195         size_t sd_size = 0;
3196         struct security_acl *psa = NULL;
3197         size_t num_acls = 0;
3198         size_t num_def_acls = 0;
3199         size_t num_aces = 0;
3200         canon_ace *file_ace = NULL;
3201         canon_ace *dir_ace = NULL;
3202         struct security_ace *nt_ace_list = NULL;
3203         size_t num_profile_acls = 0;
3204         struct dom_sid orig_owner_sid;
3205         struct security_descriptor *psd = NULL;
3206         int i;
3207
3208         /*
3209          * Get the owner, group and world SIDs.
3210          */
3211
3212         create_file_sids(sbuf, &owner_sid, &group_sid);
3213
3214         if (lp_profile_acls(SNUM(conn))) {
3215                 /* For WXP SP1 the owner must be administrators. */
3216                 sid_copy(&orig_owner_sid, &owner_sid);
3217                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3218                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3219                 num_profile_acls = 3;
3220         }
3221
3222         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3223
3224                 /*
3225                  * In the optimum case Creator Owner and Creator Group would be used for
3226                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3227                  * would lead to usability problems under Windows: The Creator entries
3228                  * are only available in browse lists of directories and not for files;
3229                  * additionally the identity of the owning group couldn't be determined.
3230                  * We therefore use those identities only for Default ACLs.
3231                  */
3232
3233                 /* Create the canon_ace lists. */
3234                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3235                                             &owner_sid, &group_sid, pal,
3236                                             SMB_ACL_TYPE_ACCESS);
3237
3238                 /* We must have *some* ACLS. */
3239
3240                 if (count_canon_ace_list(file_ace) == 0) {
3241                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3242                         goto done;
3243                 }
3244
3245                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3246                         dir_ace = canonicalise_acl(conn, name, def_acl,
3247                                                    sbuf,
3248                                                    &global_sid_Creator_Owner,
3249                                                    &global_sid_Creator_Group,
3250                                                    pal, SMB_ACL_TYPE_DEFAULT);
3251                 }
3252
3253                 /*
3254                  * Create the NT ACE list from the canonical ace lists.
3255                  */
3256
3257                 {
3258                         canon_ace *ace;
3259                         enum security_ace_type nt_acl_type;
3260
3261                         if (nt4_compatible_acls() && dir_ace) {
3262                                 /*
3263                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3264                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3265                                  * remove entries from the Access ACL if the
3266                                  * corresponding Default ACL entries have also been
3267                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3268                                  * are exceptions. We can do nothing
3269                                  * intelligent if the Default ACL contains entries that
3270                                  * are not also contained in the Access ACL, so this
3271                                  * case will still fail under NT 4.
3272                                  */
3273
3274                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3275                                 if (ace && !ace->perms) {
3276                                         DLIST_REMOVE(dir_ace, ace);
3277                                         SAFE_FREE(ace);
3278
3279                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3280                                         if (ace && !ace->perms) {
3281                                                 DLIST_REMOVE(file_ace, ace);
3282                                                 SAFE_FREE(ace);
3283                                         }
3284                                 }
3285
3286                                 /*
3287                                  * WinNT doesn't usually have Creator Group
3288                                  * in browse lists, so we send this entry to
3289                                  * WinNT even if it contains no relevant
3290                                  * permissions. Once we can add
3291                                  * Creator Group to browse lists we can
3292                                  * re-enable this.
3293                                  */
3294
3295 #if 0
3296                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3297                                 if (ace && !ace->perms) {
3298                                         DLIST_REMOVE(dir_ace, ace);
3299                                         SAFE_FREE(ace);
3300                                 }
3301 #endif
3302
3303                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3304                                 if (ace && !ace->perms) {
3305                                         DLIST_REMOVE(file_ace, ace);
3306                                         SAFE_FREE(ace);
3307                                 }
3308                         }
3309
3310                         num_acls = count_canon_ace_list(file_ace);
3311                         num_def_acls = count_canon_ace_list(dir_ace);
3312
3313                         /* Allocate the ace list. */
3314                         if ((nt_ace_list = SMB_MALLOC_ARRAY(struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3315                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3316                                 goto done;
3317                         }
3318
3319                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3320
3321                         /*
3322                          * Create the NT ACE list from the canonical ace lists.
3323                          */
3324
3325                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3326                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3327                                                 &nt_acl_type,
3328                                                 ace->perms,
3329                                                 S_ISDIR(sbuf->st_ex_mode));
3330                                 init_sec_ace(&nt_ace_list[num_aces++],
3331                                         &ace->trustee,
3332                                         nt_acl_type,
3333                                         acc,
3334                                         ace->ace_flags);
3335                         }
3336
3337                         /* The User must have access to a profile share - even
3338                          * if we can't map the SID. */
3339                         if (lp_profile_acls(SNUM(conn))) {
3340                                 add_or_replace_ace(nt_ace_list, &num_aces,
3341                                                    &global_sid_Builtin_Users,
3342                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3343                                                    FILE_GENERIC_ALL, 0);
3344                         }
3345
3346                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3347                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3348                                                 &nt_acl_type,
3349                                                 ace->perms,
3350                                                 S_ISDIR(sbuf->st_ex_mode));
3351                                 init_sec_ace(&nt_ace_list[num_aces++],
3352                                         &ace->trustee,
3353                                         nt_acl_type,
3354                                         acc,
3355                                         ace->ace_flags |
3356                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3357                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3358                                         SEC_ACE_FLAG_INHERIT_ONLY);
3359                         }
3360
3361                         /* The User must have access to a profile share - even
3362                          * if we can't map the SID. */
3363                         if (lp_profile_acls(SNUM(conn))) {
3364                                 add_or_replace_ace(nt_ace_list, &num_aces,
3365                                                 &global_sid_Builtin_Users,
3366                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3367                                                 FILE_GENERIC_ALL,
3368                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3369                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3370                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3371                         }
3372
3373                         /*
3374                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3375                          * Win2K needs this to get the inheritance correct when replacing ACLs
3376                          * on a directory tree. Based on work by Jim @ IBM.
3377                          */
3378
3379                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3380
3381                         if (lp_profile_acls(SNUM(conn))) {
3382                                 for (i = 0; i < num_aces; i++) {
3383                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3384                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3385                                                                    &orig_owner_sid,
3386                                                                    nt_ace_list[i].type,
3387                                                                    nt_ace_list[i].access_mask,
3388                                                                    nt_ace_list[i].flags);
3389                                                 break;
3390                                         }
3391                                 }
3392                         }
3393                 }
3394
3395                 if (num_aces) {
3396                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3397                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3398                                 goto done;
3399                         }
3400                 }
3401         } /* security_info & SECINFO_DACL */
3402
3403         psd = make_standard_sec_desc( talloc_tos(),
3404                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3405                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3406                         psa,
3407                         &sd_size);
3408
3409         if(!psd) {
3410                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3411                 sd_size = 0;
3412                 goto done;
3413         }
3414
3415         /*
3416          * Windows 2000: The DACL_PROTECTED flag in the security
3417          * descriptor marks the ACL as non-inheriting, i.e., no
3418          * ACEs from higher level directories propagate to this
3419          * ACL. In the POSIX ACL model permissions are only
3420          * inherited at file create time, so ACLs never contain
3421          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3422          * flag doesn't seem to bother Windows NT.
3423          * Always set this if map acl inherit is turned off.
3424          */
3425         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3426                 psd->type |= SEC_DESC_DACL_PROTECTED;
3427         } else {
3428                 psd->type |= pal->sd_type;
3429         }
3430
3431         if (psd->dacl) {
3432                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3433         }
3434
3435         *ppdesc = psd;
3436
3437  done:
3438
3439         if (posix_acl) {
3440                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3441         }
3442         if (def_acl) {
3443                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3444         }
3445         free_canon_ace_list(file_ace);
3446         free_canon_ace_list(dir_ace);
3447         free_inherited_info(pal);
3448         SAFE_FREE(nt_ace_list);
3449
3450         return NT_STATUS_OK;
3451 }
3452
3453 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3454                            struct security_descriptor **ppdesc)
3455 {
3456         SMB_STRUCT_STAT sbuf;
3457         SMB_ACL_T posix_acl = NULL;
3458         struct pai_val *pal;
3459
3460         *ppdesc = NULL;
3461
3462         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3463                   fsp_str_dbg(fsp)));
3464
3465         /* can it happen that fsp_name == NULL ? */
3466         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3467                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3468                                         security_info, ppdesc);
3469         }
3470
3471         /* Get the stat struct for the owner info. */
3472         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3473                 return map_nt_error_from_unix(errno);
3474         }
3475
3476         /* Get the ACL from the fd. */
3477         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3478
3479         pal = fload_inherited_info(fsp);
3480
3481         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3482                                        &sbuf, pal, posix_acl, NULL,
3483                                        security_info, ppdesc);
3484 }
3485
3486 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3487                           uint32_t security_info, struct security_descriptor **ppdesc)
3488 {
3489         SMB_ACL_T posix_acl = NULL;
3490         SMB_ACL_T def_acl = NULL;
3491         struct pai_val *pal;
3492         struct smb_filename smb_fname;
3493         int ret;
3494
3495         *ppdesc = NULL;
3496
3497         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3498
3499         ZERO_STRUCT(smb_fname);
3500         smb_fname.base_name = discard_const_p(char, name);
3501
3502         /* Get the stat struct for the owner info. */
3503         if (lp_posix_pathnames()) {
3504                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3505         } else {
3506                 ret = SMB_VFS_STAT(conn, &smb_fname);
3507         }
3508
3509         if (ret == -1) {
3510                 return map_nt_error_from_unix(errno);
3511         }
3512
3513         /* Get the ACL from the path. */
3514         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3515
3516         /* If it's a directory get the default POSIX ACL. */
3517         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3518                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3519                 def_acl = free_empty_sys_acl(conn, def_acl);
3520         }
3521
3522         pal = load_inherited_info(conn, name);
3523
3524         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3525                                        posix_acl, def_acl, security_info,
3526                                        ppdesc);
3527 }
3528
3529 /****************************************************************************
3530  Try to chown a file. We will be able to chown it under the following conditions.
3531
3532   1) If we have root privileges, then it will just work.
3533   2) If we have SeRestorePrivilege we can change the user + group to any other user.
3534   3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3535   4) If we have write permission to the file and dos_filemodes is set
3536      then allow chown to the currently authenticated user.
3537 ****************************************************************************/
3538
3539 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3540 {
3541         NTSTATUS status;
3542
3543         if(!CAN_WRITE(fsp->conn)) {
3544                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3545         }
3546
3547         /* Case (1). */
3548         status = vfs_chown_fsp(fsp, uid, gid);
3549         if (NT_STATUS_IS_OK(status)) {
3550                 return status;
3551         }
3552
3553         /* Case (2) / (3) */
3554         if (lp_enable_privileges()) {
3555                 bool has_take_ownership_priv = security_token_has_privilege(
3556                                                 get_current_nttok(fsp->conn),
3557                                                 SEC_PRIV_TAKE_OWNERSHIP);
3558                 bool has_restore_priv = security_token_has_privilege(
3559                                                 get_current_nttok(fsp->conn),
3560                                                 SEC_PRIV_RESTORE);
3561
3562                 if (has_restore_priv) {
3563                         ; /* Case (2) */
3564                 } else if (has_take_ownership_priv) {
3565                         /* Case (3) */
3566                         if (uid == get_current_uid(fsp->conn)) {
3567                                 gid = (gid_t)-1;
3568                         } else {
3569                                 has_take_ownership_priv = false;
3570                         }
3571                 }
3572
3573                 if (has_take_ownership_priv || has_restore_priv) {
3574                         become_root();
3575                         status = vfs_chown_fsp(fsp, uid, gid);
3576                         unbecome_root();
3577                         return status;
3578                 }
3579         }
3580
3581         /* Case (4). */
3582         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3583                 return NT_STATUS_ACCESS_DENIED;
3584         }
3585
3586         /* only allow chown to the current user. This is more secure,
3587            and also copes with the case where the SID in a take ownership ACL is
3588            a local SID on the users workstation
3589         */
3590         if (uid != get_current_uid(fsp->conn)) {
3591                 return NT_STATUS_ACCESS_DENIED;
3592         }
3593
3594         become_root();
3595         /* Keep the current file gid the same. */
3596         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3597         unbecome_root();
3598
3599         return status;
3600 }
3601
3602 #if 0
3603 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3604
3605 /****************************************************************************
3606  Take care of parent ACL inheritance.
3607 ****************************************************************************/
3608
3609 NTSTATUS append_parent_acl(files_struct *fsp,
3610                                 const struct security_descriptor *pcsd,
3611                                 struct security_descriptor **pp_new_sd)
3612 {
3613         struct smb_filename *smb_dname = NULL;
3614         struct security_descriptor *parent_sd = NULL;
3615         files_struct *parent_fsp = NULL;
3616         TALLOC_CTX *mem_ctx = talloc_tos();
3617         char *parent_name = NULL;
3618         struct security_ace *new_ace = NULL;
3619         unsigned int num_aces = pcsd->dacl->num_aces;
3620         NTSTATUS status;
3621         int info;
3622         unsigned int i, j;
3623         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3624         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3625
3626         if (psd == NULL) {
3627                 return NT_STATUS_NO_MEMORY;
3628         }
3629
3630         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3631                             NULL)) {
3632                 return NT_STATUS_NO_MEMORY;
3633         }
3634
3635         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3636                                             &smb_dname);
3637         if (!NT_STATUS_IS_OK(status)) {
3638                 goto fail;
3639         }
3640
3641         status = SMB_VFS_CREATE_FILE(
3642                 fsp->conn,                              /* conn */
3643                 NULL,                                   /* req */
3644                 0,                                      /* root_dir_fid */
3645                 smb_dname,                              /* fname */
3646                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3647                 FILE_SHARE_NONE,                        /* share_access */
3648                 FILE_OPEN,                              /* create_disposition*/
3649                 FILE_DIRECTORY_FILE,                    /* create_options */
3650                 0,                                      /* file_attributes */
3651                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3652                 0,                                      /* allocation_size */
3653                 NULL,                                   /* sd */
3654                 NULL,                                   /* ea_list */
3655                 &parent_fsp,                            /* result */
3656                 &info);                                 /* pinfo */
3657
3658         if (!NT_STATUS_IS_OK(status)) {
3659                 TALLOC_FREE(smb_dname);
3660                 return status;
3661         }
3662
3663         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3664                                     SECINFO_DACL, &parent_sd );
3665
3666         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3667         TALLOC_FREE(smb_dname);
3668
3669         if (!NT_STATUS_IS_OK(status)) {
3670                 return status;
3671         }
3672
3673         /*
3674          * Make room for potentially all the ACLs from
3675          * the parent. We used to add the ugw triple here,
3676          * as we knew we were dealing with POSIX ACLs.
3677          * We no longer need to do so as we can guarentee
3678          * that a default ACL from the parent directory will
3679          * be well formed for POSIX ACLs if it came from a
3680          * POSIX ACL source, and if we're not writing to a
3681          * POSIX ACL sink then we don't care if it's not well
3682          * formed. JRA.
3683          */
3684
3685         num_aces += parent_sd->dacl->num_aces;
3686
3687         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, struct security_ace,
3688                                         num_aces)) == NULL) {
3689                 return NT_STATUS_NO_MEMORY;
3690         }
3691
3692         /* Start by copying in all the given ACE entries. */
3693         for (i = 0; i < psd->dacl->num_aces; i++) {
3694                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3695         }
3696
3697         /*
3698          * Note that we're ignoring "inherit permissions" here
3699          * as that really only applies to newly created files. JRA.
3700          */
3701
3702         /* Finally append any inherited ACEs. */
3703         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3704                 struct security_ace *se = &parent_sd->dacl->aces[j];
3705
3706                 if (fsp->is_directory) {
3707                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3708                                 /* Doesn't apply to a directory - ignore. */
3709                                 DEBUG(10,("append_parent_acl: directory %s "
3710                                         "ignoring non container "
3711                                         "inherit flags %u on ACE with sid %s "
3712                                         "from parent %s\n",
3713                                         fsp_str_dbg(fsp),
3714                                         (unsigned int)se->flags,
3715                                         sid_string_dbg(&se->trustee),
3716                                         parent_name));
3717                                 continue;
3718                         }
3719                 } else {
3720                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3721                                 /* Doesn't apply to a file - ignore. */
3722                                 DEBUG(10,("append_parent_acl: file %s "
3723                                         "ignoring non object "
3724                                         "inherit flags %u on ACE with sid %s "
3725                                         "from parent %s\n",
3726                                         fsp_str_dbg(fsp),
3727                                         (unsigned int)se->flags,
3728                                         sid_string_dbg(&se->trustee),
3729                                         parent_name));
3730                                 continue;
3731                         }
3732                 }
3733
3734                 if (is_dacl_protected) {
3735                         /* If the DACL is protected it means we must
3736                          * not overwrite an existing ACE entry with the
3737                          * same SID. This is order N^2. Ouch :-(. JRA. */
3738                         unsigned int k;
3739                         for (k = 0; k < psd->dacl->num_aces; k++) {
3740                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3741                                                 &se->trustee)) {
3742                                         break;
3743                                 }
3744                         }
3745                         if (k < psd->dacl->num_aces) {
3746                                 /* SID matched. Ignore. */
3747                                 DEBUG(10,("append_parent_acl: path %s "
3748                                         "ignoring ACE with protected sid %s "
3749                                         "from parent %s\n",
3750                                         fsp_str_dbg(fsp),
3751                                         sid_string_dbg(&se->trustee),
3752                                         parent_name));
3753                                 continue;
3754                         }
3755                 }
3756
3757                 sec_ace_copy(&new_ace[i], se);
3758                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3759                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3760                 }
3761                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3762
3763                 if (fsp->is_directory) {
3764                         /*
3765                          * Strip off any inherit only. It's applied.
3766                          */
3767                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3768                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3769                                 /* No further inheritance. */
3770                                 new_ace[i].flags &=
3771                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3772                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3773                         }
3774                 } else {
3775                         /*
3776                          * Strip off any container or inherit
3777                          * flags, they can't apply to objects.
3778                          */
3779                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3780                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3781                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3782                 }
3783                 i++;
3784
3785                 DEBUG(10,("append_parent_acl: path %s "
3786                         "inheriting ACE with sid %s "
3787                         "from parent %s\n",
3788                         fsp_str_dbg(fsp),
3789                         sid_string_dbg(&se->trustee),
3790                         parent_name));
3791         }
3792
3793         psd->dacl->aces = new_ace;
3794         psd->dacl->num_aces = i;
3795         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3796                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
3797
3798         *pp_new_sd = psd;
3799         return status;
3800 }
3801 #endif
3802
3803 /****************************************************************************
3804  Reply to set a security descriptor on an fsp. security_info_sent is the
3805  description of the following NT ACL.
3806  This should be the only external function needed for the UNIX style set ACL.
3807  We make a copy of psd_orig as internal functions modify the elements inside
3808  it, even though it's a const pointer.
3809 ****************************************************************************/
3810
3811 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3812 {
3813         connection_struct *conn = fsp->conn;
3814         uid_t user = (uid_t)-1;
3815         gid_t grp = (gid_t)-1;
3816         struct dom_sid file_owner_sid;
3817         struct dom_sid file_grp_sid;
3818         canon_ace *file_ace_list = NULL;
3819         canon_ace *dir_ace_list = NULL;
3820         bool acl_perms = False;
3821         mode_t orig_mode = (mode_t)0;
3822         NTSTATUS status;
3823         bool set_acl_as_root = false;
3824         bool acl_set_support = false;
3825         bool ret = false;
3826         struct security_descriptor *psd = NULL;
3827
3828         DEBUG(10,("set_nt_acl: called for file %s\n",
3829                   fsp_str_dbg(fsp)));
3830
3831         if (!CAN_WRITE(conn)) {
3832                 DEBUG(10,("set acl rejected on read-only share\n"));
3833                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3834         }
3835
3836         if (!psd_orig) {
3837                 return NT_STATUS_INVALID_PARAMETER;
3838         }
3839
3840         psd = dup_sec_desc(talloc_tos(), psd_orig);
3841         if (!psd) {
3842                 return NT_STATUS_NO_MEMORY;
3843         }
3844
3845         /*
3846          * Get the current state of the file.
3847          */
3848
3849         status = vfs_stat_fsp(fsp);
3850         if (!NT_STATUS_IS_OK(status)) {
3851                 return status;
3852         }
3853
3854         /* Save the original element we check against. */
3855         orig_mode = fsp->fsp_name->st.st_ex_mode;
3856
3857         /*
3858          * Unpack the user/group/world id's.
3859          */
3860
3861         /* POSIX can't cope with missing owner/group. */
3862         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3863                 security_info_sent &= ~SECINFO_OWNER;
3864         }
3865         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3866                 security_info_sent &= ~SECINFO_GROUP;
3867         }
3868
3869         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3870         if (!NT_STATUS_IS_OK(status)) {
3871                 return status;
3872         }
3873
3874         /*
3875          * Do we need to chown ? If so this must be done first as the incoming
3876          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3877          * Noticed by Simo.
3878          */
3879
3880         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3881             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3882
3883                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3884                          fsp_str_dbg(fsp), (unsigned int)user,
3885                          (unsigned int)grp));
3886
3887                 status = try_chown(fsp, user, grp);
3888                 if(!NT_STATUS_IS_OK(status)) {
3889                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3890                                 "= %s.\n", fsp_str_dbg(fsp),
3891                                 (unsigned int)user,
3892                                 (unsigned int)grp,
3893                                 nt_errstr(status)));
3894                         return status;
3895                 }
3896
3897                 /*
3898                  * Recheck the current state of the file, which may have changed.
3899                  * (suid/sgid bits, for instance)
3900                  */
3901
3902                 status = vfs_stat_fsp(fsp);
3903                 if (!NT_STATUS_IS_OK(status)) {
3904                         return status;
3905                 }
3906
3907                 /* Save the original element we check against. */
3908                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3909
3910                 /* If we successfully chowned, we know we must
3911                  * be able to set the acl, so do it as root.
3912                  */
3913                 set_acl_as_root = true;
3914         }
3915
3916         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3917
3918         if((security_info_sent & SECINFO_DACL) &&
3919                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3920                         (psd->dacl == NULL)) {
3921                 struct security_ace ace[3];
3922
3923                 /* We can't have NULL DACL in POSIX.
3924                    Use owner/group/Everyone -> full access. */
3925
3926                 init_sec_ace(&ace[0],
3927                                 &file_owner_sid,
3928                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3929                                 GENERIC_ALL_ACCESS,
3930                                 0);
3931                 init_sec_ace(&ace[1],
3932                                 &file_grp_sid,
3933                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3934                                 GENERIC_ALL_ACCESS,
3935                                 0);
3936                 init_sec_ace(&ace[2],
3937                                 &global_sid_World,
3938                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3939                                 GENERIC_ALL_ACCESS,
3940                                 0);
3941                 psd->dacl = make_sec_acl(talloc_tos(),
3942                                         NT4_ACL_REVISION,
3943                                         3,
3944                                         ace);
3945                 if (psd->dacl == NULL) {
3946                         return NT_STATUS_NO_MEMORY;
3947                 }
3948                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3949         }
3950
3951         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3952                                      &file_grp_sid, &file_ace_list,
3953                                      &dir_ace_list, security_info_sent, psd);
3954
3955         /* Ignore W2K traverse DACL set. */
3956         if (!file_ace_list && !dir_ace_list) {
3957                 return NT_STATUS_OK;
3958         }
3959
3960         if (!acl_perms) {
3961                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3962                 free_canon_ace_list(file_ace_list);
3963                 free_canon_ace_list(dir_ace_list);
3964                 return NT_STATUS_ACCESS_DENIED;
3965         }
3966
3967         /*
3968          * Only change security if we got a DACL.
3969          */
3970
3971         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3972                 free_canon_ace_list(file_ace_list);
3973                 free_canon_ace_list(dir_ace_list);
3974                 return NT_STATUS_OK;
3975         }
3976
3977         /*
3978          * Try using the POSIX ACL set first. Fall back to chmod if
3979          * we have no ACL support on this filesystem.
3980          */
3981
3982         if (acl_perms && file_ace_list) {
3983                 if (set_acl_as_root) {
3984                         become_root();
3985                 }
3986                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3987                                          &fsp->fsp_name->st, &acl_set_support);
3988                 if (set_acl_as_root) {
3989                         unbecome_root();
3990                 }
3991                 if (acl_set_support && ret == false) {
3992                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3993                                  "%s (%s).\n", fsp_str_dbg(fsp),
3994                                  strerror(errno)));
3995                         free_canon_ace_list(file_ace_list);
3996                         free_canon_ace_list(dir_ace_list);
3997                         return map_nt_error_from_unix(errno);
3998                 }
3999         }
4000
4001         if (acl_perms && acl_set_support && fsp->is_directory) {
4002                 if (dir_ace_list) {
4003                         if (set_acl_as_root) {
4004                                 become_root();
4005                         }
4006                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
4007                                                  &fsp->fsp_name->st,
4008                                                  &acl_set_support);
4009                         if (set_acl_as_root) {
4010                                 unbecome_root();
4011                         }
4012                         if (ret == false) {
4013                                 DEBUG(3,("set_nt_acl: failed to set default "
4014                                          "acl on directory %s (%s).\n",
4015                                          fsp_str_dbg(fsp), strerror(errno)));
4016                                 free_canon_ace_list(file_ace_list);
4017                                 free_canon_ace_list(dir_ace_list);
4018                                 return map_nt_error_from_unix(errno);
4019                         }
4020                 } else {
4021                         int sret = -1;
4022
4023                         /*
4024                          * No default ACL - delete one if it exists.
4025                          */
4026
4027                         if (set_acl_as_root) {
4028                                 become_root();
4029                         }
4030                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4031                             fsp->fsp_name->base_name);
4032                         if (set_acl_as_root) {
4033                                 unbecome_root();
4034                         }
4035                         if (sret == -1) {
4036                                 if (acl_group_override(conn, fsp->fsp_name)) {
4037                                         DEBUG(5,("set_nt_acl: acl group "
4038                                                  "control on and current user "
4039                                                  "in file %s primary group. "
4040                                                  "Override delete_def_acl\n",
4041                                                  fsp_str_dbg(fsp)));
4042
4043                                         become_root();
4044                                         sret =
4045                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4046                                                     conn,
4047                                                     fsp->fsp_name->base_name);
4048                                         unbecome_root();
4049                                 }
4050
4051                                 if (sret == -1) {
4052                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4053                                         free_canon_ace_list(file_ace_list);
4054                                         free_canon_ace_list(dir_ace_list);
4055                                         return map_nt_error_from_unix(errno);
4056                                 }
4057                         }
4058                 }
4059         }
4060
4061         if (acl_set_support) {
4062                 if (set_acl_as_root) {
4063                         become_root();
4064                 }
4065                 store_inheritance_attributes(fsp,
4066                                 file_ace_list,
4067                                 dir_ace_list,
4068                                 psd->type);
4069                 if (set_acl_as_root) {
4070                         unbecome_root();
4071                 }
4072         }
4073
4074         /*
4075          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4076          */
4077
4078         if(!acl_set_support && acl_perms) {
4079                 mode_t posix_perms;
4080
4081                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4082                         free_canon_ace_list(file_ace_list);
4083                         free_canon_ace_list(dir_ace_list);
4084                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4085                                  "posix permissions for file %s.\n",
4086                                  fsp_str_dbg(fsp)));
4087                         return NT_STATUS_ACCESS_DENIED;
4088                 }
4089
4090                 if (orig_mode != posix_perms) {
4091                         int sret = -1;
4092
4093                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4094                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4095
4096                         if (set_acl_as_root) {
4097                                 become_root();
4098                         }
4099                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4100                                              posix_perms);
4101                         if (set_acl_as_root) {
4102                                 unbecome_root();
4103                         }
4104                         if(sret == -1) {
4105                                 if (acl_group_override(conn, fsp->fsp_name)) {
4106                                         DEBUG(5,("set_nt_acl: acl group "
4107                                                  "control on and current user "
4108                                                  "in file %s primary group. "
4109                                                  "Override chmod\n",
4110                                                  fsp_str_dbg(fsp)));
4111
4112                                         become_root();
4113                                         sret = SMB_VFS_CHMOD(conn,
4114                                             fsp->fsp_name->base_name,
4115                                             posix_perms);
4116                                         unbecome_root();
4117                                 }
4118
4119                                 if (sret == -1) {
4120                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4121                                                  "failed. Error = %s.\n",
4122                                                  fsp_str_dbg(fsp),
4123                                                  (unsigned int)posix_perms,
4124                                                  strerror(errno)));
4125                                         free_canon_ace_list(file_ace_list);
4126                                         free_canon_ace_list(dir_ace_list);
4127                                         return map_nt_error_from_unix(errno);
4128                                 }
4129                         }
4130                 }
4131         }
4132
4133         free_canon_ace_list(file_ace_list);
4134         free_canon_ace_list(dir_ace_list);
4135
4136         /* Ensure the stat struct in the fsp is correct. */
4137         status = vfs_stat_fsp(fsp);
4138
4139         return NT_STATUS_OK;
4140 }
4141
4142 /****************************************************************************
4143  Get the actual group bits stored on a file with an ACL. Has no effect if
4144  the file has no ACL. Needed in dosmode code where the stat() will return
4145  the mask bits, not the real group bits, for a file with an ACL.
4146 ****************************************************************************/
4147
4148 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4149 {
4150         int entry_id = SMB_ACL_FIRST_ENTRY;
4151         SMB_ACL_ENTRY_T entry;
4152         SMB_ACL_T posix_acl;
4153         int result = -1;
4154
4155         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4156         if (posix_acl == (SMB_ACL_T)NULL)
4157                 return -1;
4158
4159         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4160                 SMB_ACL_TAG_T tagtype;
4161                 SMB_ACL_PERMSET_T permset;
4162
4163                 entry_id = SMB_ACL_NEXT_ENTRY;
4164
4165                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4166                         break;
4167
4168                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4169                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4170                                 break;
4171                         } else {
4172                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4173                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4174                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4175                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4176                                 result = 0;
4177                                 break;
4178                         }
4179                 }
4180         }
4181         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4182         return result;
4183 }
4184
4185 /****************************************************************************
4186  Do a chmod 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 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4191 {
4192         int entry_id = SMB_ACL_FIRST_ENTRY;
4193         SMB_ACL_ENTRY_T entry;
4194         int num_entries = 0;
4195
4196         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4197                 SMB_ACL_TAG_T tagtype;
4198                 SMB_ACL_PERMSET_T permset;
4199                 mode_t perms;
4200
4201                 entry_id = SMB_ACL_NEXT_ENTRY;
4202
4203                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4204                         return -1;
4205
4206                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4207                         return -1;
4208
4209                 num_entries++;
4210
4211                 switch(tagtype) {
4212                         case SMB_ACL_USER_OBJ:
4213                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4214                                 break;
4215                         case SMB_ACL_GROUP_OBJ:
4216                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4217                                 break;
4218                         case SMB_ACL_MASK:
4219                                 /*
4220                                  * FIXME: The ACL_MASK entry permissions should really be set to
4221                                  * the union of the permissions of all ACL_USER,
4222                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4223                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4224                                  */
4225                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4226                                 break;
4227                         case SMB_ACL_OTHER:
4228                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4229                                 break;
4230                         default:
4231                                 continue;
4232                 }
4233
4234                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4235                         return -1;
4236
4237                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4238                         return -1;
4239         }
4240
4241         /*
4242          * If this is a simple 3 element ACL or no elements then it's a standard
4243          * UNIX permission set. Just use chmod...
4244          */
4245
4246         if ((num_entries == 3) || (num_entries == 0))
4247                 return -1;
4248
4249         return 0;
4250 }
4251
4252 /****************************************************************************
4253  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4254  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4255  resulting ACL on TO.  Note that name is in UNIX character set.
4256 ****************************************************************************/
4257
4258 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4259 {
4260         SMB_ACL_T posix_acl = NULL;
4261         int ret = -1;
4262
4263         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4264                 return -1;
4265
4266         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4267                 goto done;
4268
4269         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4270
4271  done:
4272
4273         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4274         return ret;
4275 }
4276
4277 /****************************************************************************
4278  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4279  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4280  Note that name is in UNIX character set.
4281 ****************************************************************************/
4282
4283 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4284 {
4285         return copy_access_posix_acl(conn, name, name, mode);
4286 }
4287
4288 /****************************************************************************
4289  Check for an existing default POSIX ACL on a directory.
4290 ****************************************************************************/
4291
4292 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4293 {
4294         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4295         bool has_acl = False;
4296         SMB_ACL_ENTRY_T entry;
4297
4298         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4299                 has_acl = True;
4300         }
4301
4302         if (def_acl) {
4303                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4304         }
4305         return has_acl;
4306 }
4307
4308 /****************************************************************************
4309  If the parent directory has no default ACL but it does have an Access ACL,
4310  inherit this Access ACL to file name.
4311 ****************************************************************************/
4312
4313 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4314                        const char *name, mode_t mode)
4315 {
4316         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4317                 return 0;
4318
4319         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4320 }
4321
4322 /****************************************************************************
4323  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4324  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4325 ****************************************************************************/
4326
4327 int fchmod_acl(files_struct *fsp, mode_t mode)
4328 {
4329         connection_struct *conn = fsp->conn;
4330         SMB_ACL_T posix_acl = NULL;
4331         int ret = -1;
4332
4333         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4334                 return -1;
4335
4336         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4337                 goto done;
4338
4339         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4340
4341   done:
4342
4343         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4344         return ret;
4345 }
4346
4347 /****************************************************************************
4348  Map from wire type to permset.
4349 ****************************************************************************/
4350
4351 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4352 {
4353         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4354                 return False;
4355         }
4356
4357         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4358                 return False;
4359         }
4360
4361         if (wire_perm & SMB_POSIX_ACL_READ) {
4362                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4363                         return False;
4364                 }
4365         }
4366         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4367                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4368                         return False;
4369                 }
4370         }
4371         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4372                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4373                         return False;
4374                 }
4375         }
4376         return True;
4377 }
4378
4379 /****************************************************************************
4380  Map from wire type to tagtype.
4381 ****************************************************************************/
4382
4383 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4384 {
4385         switch (wire_tt) {
4386                 case SMB_POSIX_ACL_USER_OBJ:
4387                         *p_tt = SMB_ACL_USER_OBJ;
4388                         break;
4389                 case SMB_POSIX_ACL_USER:
4390                         *p_tt = SMB_ACL_USER;
4391                         break;
4392                 case SMB_POSIX_ACL_GROUP_OBJ:
4393                         *p_tt = SMB_ACL_GROUP_OBJ;
4394                         break;
4395                 case SMB_POSIX_ACL_GROUP:
4396                         *p_tt = SMB_ACL_GROUP;
4397                         break;
4398                 case SMB_POSIX_ACL_MASK:
4399                         *p_tt = SMB_ACL_MASK;
4400                         break;
4401                 case SMB_POSIX_ACL_OTHER:
4402                         *p_tt = SMB_ACL_OTHER;
4403                         break;
4404                 default:
4405                         return False;
4406         }
4407         return True;
4408 }
4409
4410 /****************************************************************************
4411  Create a new POSIX acl from wire permissions.
4412  FIXME ! How does the share mask/mode fit into this.... ?
4413 ****************************************************************************/
4414
4415 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4416 {
4417         unsigned int i;
4418         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4419
4420         if (the_acl == NULL) {
4421                 return NULL;
4422         }
4423
4424         for (i = 0; i < num_acls; i++) {
4425                 SMB_ACL_ENTRY_T the_entry;
4426                 SMB_ACL_PERMSET_T the_permset;
4427                 SMB_ACL_TAG_T tag_type;
4428
4429                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4430                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4431                                 i, strerror(errno) ));
4432                         goto fail;
4433                 }
4434
4435                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4436                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4437                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4438                         goto fail;
4439                 }
4440
4441                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4442                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4443                                 i, strerror(errno) ));
4444                         goto fail;
4445                 }
4446
4447                 /* Get the permset pointer from the new ACL entry. */
4448                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4449                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4450                                 i, strerror(errno) ));
4451                         goto fail;
4452                 }
4453
4454                 /* Map from wire to permissions. */
4455                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4456                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4457                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4458                         goto fail;
4459                 }
4460
4461                 /* Now apply to the new ACL entry. */
4462                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4463                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4464                                 i, strerror(errno) ));
4465                         goto fail;
4466                 }
4467
4468                 if (tag_type == SMB_ACL_USER) {
4469                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4470                         uid_t uid = (uid_t)uidval;
4471                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4472                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4473                                         (unsigned int)uid, i, strerror(errno) ));
4474                                 goto fail;
4475                         }
4476                 }
4477
4478                 if (tag_type == SMB_ACL_GROUP) {
4479                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4480                         gid_t gid = (uid_t)gidval;
4481                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4482                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4483                                         (unsigned int)gid, i, strerror(errno) ));
4484                                 goto fail;
4485                         }
4486                 }
4487         }
4488
4489         return the_acl;
4490
4491  fail:
4492
4493         if (the_acl != NULL) {
4494                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4495         }
4496         return NULL;
4497 }
4498
4499 /****************************************************************************
4500  Calls from UNIX extensions - Default POSIX ACL set.
4501  If num_def_acls == 0 and not a directory just return. If it is a directory
4502  and num_def_acls == 0 then remove the default acl. Else set the default acl
4503  on the directory.
4504 ****************************************************************************/
4505
4506 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4507                                 uint16 num_def_acls, const char *pdata)
4508 {
4509         SMB_ACL_T def_acl = NULL;
4510
4511         if (!S_ISDIR(psbuf->st_ex_mode)) {
4512                 if (num_def_acls) {
4513                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4514                         errno = EISDIR;
4515                         return False;
4516                 } else {
4517                         return True;
4518                 }
4519         }
4520
4521         if (!num_def_acls) {
4522                 /* Remove the default ACL. */
4523                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4524                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4525                                 fname, strerror(errno) ));
4526                         return False;
4527                 }
4528                 return True;
4529         }
4530
4531         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4532                 return False;
4533         }
4534
4535         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4536                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4537                         fname, strerror(errno) ));
4538                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4539                 return False;
4540         }
4541
4542         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4543         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4544         return True;
4545 }
4546
4547 /****************************************************************************
4548  Remove an ACL from a file. As we don't have acl_delete_entry() available
4549  we must read the current acl and copy all entries except MASK, USER and GROUP
4550  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4551  removed.
4552  FIXME ! How does the share mask/mode fit into this.... ?
4553 ****************************************************************************/
4554
4555 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4556 {
4557         SMB_ACL_T file_acl = NULL;
4558         int entry_id = SMB_ACL_FIRST_ENTRY;
4559         SMB_ACL_ENTRY_T entry;
4560         bool ret = False;
4561         /* Create a new ACL with only 3 entries, u/g/w. */
4562         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4563         SMB_ACL_ENTRY_T user_ent = NULL;
4564         SMB_ACL_ENTRY_T group_ent = NULL;
4565         SMB_ACL_ENTRY_T other_ent = NULL;
4566
4567         if (new_file_acl == NULL) {
4568                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4569                 return False;
4570         }
4571
4572         /* Now create the u/g/w entries. */
4573         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4574                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4575                         fname, strerror(errno) ));
4576                 goto done;
4577         }
4578         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4579                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4580                         fname, strerror(errno) ));
4581                 goto done;
4582         }
4583
4584         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4585                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4586                         fname, strerror(errno) ));
4587                 goto done;
4588         }
4589         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4590                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4591                         fname, strerror(errno) ));
4592                 goto done;
4593         }
4594
4595         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4596                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4597                         fname, strerror(errno) ));
4598                 goto done;
4599         }
4600         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4601                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4602                         fname, strerror(errno) ));
4603                 goto done;
4604         }
4605
4606         /* Get the current file ACL. */
4607         if (fsp && fsp->fh->fd != -1) {
4608                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4609         } else {
4610                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4611         }
4612
4613         if (file_acl == NULL) {
4614                 /* This is only returned if an error occurred. Even for a file with
4615                    no acl a u/g/w acl should be returned. */
4616                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4617                         fname, strerror(errno) ));
4618                 goto done;
4619         }
4620
4621         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4622                 SMB_ACL_TAG_T tagtype;
4623                 SMB_ACL_PERMSET_T permset;
4624
4625                 entry_id = SMB_ACL_NEXT_ENTRY;
4626
4627                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4628                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4629                                 fname, strerror(errno) ));
4630                         goto done;
4631                 }
4632
4633                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4634                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4635                                 fname, strerror(errno) ));
4636                         goto done;
4637                 }
4638
4639                 if (tagtype == SMB_ACL_USER_OBJ) {
4640                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4641                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4642                                         fname, strerror(errno) ));
4643                         }
4644                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4645                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4646                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4647                                         fname, strerror(errno) ));
4648                         }
4649                 } else if (tagtype == SMB_ACL_OTHER) {
4650                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4651                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4652                                         fname, strerror(errno) ));
4653                         }
4654                 }
4655         }
4656
4657         /* Set the new empty file ACL. */
4658         if (fsp && fsp->fh->fd != -1) {
4659                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4660                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4661                                 fname, strerror(errno) ));
4662                         goto done;
4663                 }
4664         } else {
4665                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4666                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4667                                 fname, strerror(errno) ));
4668                         goto done;
4669                 }
4670         }
4671
4672         ret = True;
4673
4674  done:
4675
4676         if (file_acl) {
4677                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4678         }
4679         if (new_file_acl) {
4680                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4681         }
4682         return ret;
4683 }
4684
4685 /****************************************************************************
4686  Calls from UNIX extensions - POSIX ACL set.
4687  If num_def_acls == 0 then read/modify/write acl after removing all entries
4688  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4689 ****************************************************************************/
4690
4691 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4692 {
4693         SMB_ACL_T file_acl = NULL;
4694
4695         if (!num_acls) {
4696                 /* Remove the ACL from the file. */
4697                 return remove_posix_acl(conn, fsp, fname);
4698         }
4699
4700         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4701                 return False;
4702         }
4703
4704         if (fsp && fsp->fh->fd != -1) {
4705                 /* The preferred way - use an open fd. */
4706                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4707                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4708                                 fname, strerror(errno) ));
4709                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4710                         return False;
4711                 }
4712         } else {
4713                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4714                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4715                                 fname, strerror(errno) ));
4716                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4717                         return False;
4718                 }
4719         }
4720
4721         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4722         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4723         return True;
4724 }
4725
4726 /********************************************************************
4727  Pull the NT ACL from a file on disk or the OpenEventlog() access
4728  check.  Caller is responsible for freeing the returned security
4729  descriptor via TALLOC_FREE().  This is designed for dealing with
4730  user space access checks in smbd outside of the VFS.  For example,
4731  checking access rights in OpenEventlog().
4732
4733  Assume we are dealing with files (for now)
4734 ********************************************************************/
4735
4736 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4737 {
4738         struct security_descriptor *psd, *ret_sd;
4739         connection_struct *conn;
4740         files_struct finfo;
4741         struct fd_handle fh;
4742         NTSTATUS status;
4743
4744         conn = TALLOC_ZERO_P(ctx, connection_struct);
4745         if (conn == NULL) {
4746                 DEBUG(0, ("talloc failed\n"));
4747                 return NULL;
4748         }
4749
4750         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4751                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4752                 TALLOC_FREE(conn);
4753                 return NULL;
4754         }
4755
4756         conn->params->service = -1;
4757
4758         set_conn_connectpath(conn, "/");
4759
4760         if (!smbd_vfs_init(conn)) {
4761                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4762                 conn_free(conn);
4763                 return NULL;
4764         }
4765
4766         ZERO_STRUCT( finfo );
4767         ZERO_STRUCT( fh );
4768
4769         finfo.fnum = -1;
4770         finfo.conn = conn;
4771         finfo.fh = &fh;
4772         finfo.fh->fd = -1;
4773
4774         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4775                                             &finfo.fsp_name);
4776         if (!NT_STATUS_IS_OK(status)) {
4777                 conn_free(conn);
4778                 return NULL;
4779         }
4780
4781         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4782                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4783                 TALLOC_FREE(finfo.fsp_name);
4784                 conn_free(conn);
4785                 return NULL;
4786         }
4787
4788         ret_sd = dup_sec_desc( ctx, psd );
4789
4790         TALLOC_FREE(finfo.fsp_name);
4791         conn_free(conn);
4792
4793         return ret_sd;
4794 }
4795
4796 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4797
4798 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4799                                         const char *name,
4800                                         SMB_STRUCT_STAT *psbuf,
4801                                         struct security_descriptor **ppdesc)
4802 {
4803         struct dom_sid owner_sid, group_sid;
4804         size_t size = 0;
4805         struct security_ace aces[4];
4806         uint32_t access_mask = 0;
4807         mode_t mode = psbuf->st_ex_mode;
4808         struct security_acl *new_dacl = NULL;
4809         int idx = 0;
4810
4811         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4812                 name, (int)mode ));
4813
4814         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4815         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4816
4817         /*
4818          We provide up to 4 ACEs
4819                 - Owner
4820                 - Group
4821                 - Everyone
4822                 - NT System
4823         */
4824
4825         if (mode & S_IRUSR) {
4826                 if (mode & S_IWUSR) {
4827                         access_mask |= SEC_RIGHTS_FILE_ALL;
4828                 } else {
4829                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4830                 }
4831         }
4832         if (mode & S_IWUSR) {
4833                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4834         }
4835
4836         init_sec_ace(&aces[idx],
4837                         &owner_sid,
4838                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4839                         access_mask,
4840                         0);
4841         idx++;
4842
4843         access_mask = 0;
4844         if (mode & S_IRGRP) {
4845                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4846         }
4847         if (mode & S_IWGRP) {
4848                 /* note that delete is not granted - this matches posix behaviour */
4849                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4850         }
4851         if (access_mask) {
4852                 init_sec_ace(&aces[idx],
4853                         &group_sid,
4854                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4855                         access_mask,
4856                         0);
4857                 idx++;
4858         }
4859
4860         access_mask = 0;
4861         if (mode & S_IROTH) {
4862                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4863         }
4864         if (mode & S_IWOTH) {
4865                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4866         }
4867         if (access_mask) {
4868                 init_sec_ace(&aces[idx],
4869                         &global_sid_World,
4870                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4871                         access_mask,
4872                         0);
4873                 idx++;
4874         }
4875
4876         init_sec_ace(&aces[idx],
4877                         &global_sid_System,
4878                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4879                         SEC_RIGHTS_FILE_ALL,
4880                         0);
4881         idx++;
4882
4883         new_dacl = make_sec_acl(ctx,
4884                         NT4_ACL_REVISION,
4885                         idx,
4886                         aces);
4887
4888         if (!new_dacl) {
4889                 return NT_STATUS_NO_MEMORY;
4890         }
4891
4892         *ppdesc = make_sec_desc(ctx,
4893                         SECURITY_DESCRIPTOR_REVISION_1,
4894                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4895                         &owner_sid,
4896                         &group_sid,
4897                         NULL,
4898                         new_dacl,
4899                         &size);
4900         if (!*ppdesc) {
4901                 return NT_STATUS_NO_MEMORY;
4902         }
4903         return NT_STATUS_OK;
4904 }