source3/smbd/posix_acls.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB NT Security Descriptor / Unix permission conversion.
   4    Copyright (C) Jeremy Allison 1994-2009.
   5    Copyright (C) Andreas Gruenbacher 2002.
   6    Copyright (C) Simo Sorce <idra@samba.org> 2009.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "smbd/smbd.h"
  24 #include "system/filesys.h"
  25 #include "../libcli/security/security.h"
  26 #include "trans2.h"
  27 #include "passdb/lookup_sid.h"
  28 #include "auth.h"
  29
  30 extern const struct generic_mapping file_generic_mapping;
  31
  32 #undef  DBGC_CLASS
  33 #define DBGC_CLASS DBGC_ACLS
  34
  35 /****************************************************************************
  36  Data structures representing the internal ACE format.
  37 ****************************************************************************/
  38
  39 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  40 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  41
  42 typedef union posix_id {
  43                 uid_t uid;
  44                 gid_t gid;
  45                 int world;
  46 } posix_id;
  47
  48 typedef struct canon_ace {
  49         struct canon_ace *next, *prev;
  50         SMB_ACL_TAG_T type;
  51         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  52         struct dom_sid trustee;
  53         enum ace_owner owner_type;
  54         enum ace_attribute attr;
  55         posix_id unix_ug;
  56         uint8_t ace_flags; /* From windows ACE entry. */
  57 } canon_ace;
  58
  59 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  60
  61 /*
  62  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  63  * attribute on disk - version 1.
  64  * All values are little endian.
  65  *
  66  * |  1   |  1   |   2         |         2           |  ....
  67  * +------+------+-------------+---------------------+-------------+--------------------+
  68  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  69  * +------+------+-------------+---------------------+-------------+--------------------+
  70  *
  71  * Entry format is :
  72  *
  73  * |  1   |       4           |
  74  * +------+-------------------+
  75  * | value|  uid/gid or world |
  76  * | type |  value            |
  77  * +------+-------------------+
  78  *
  79  * Version 2 format. Stores extra Windows metadata about an ACL.
  80  *
  81  * |  1   |  2       |   2         |         2           |  ....
  82  * +------+----------+-------------+---------------------+-------------+--------------------+
  83  * | vers | ace      | num_entries | num_default_entries | ..entries.. | default_entries... |
  84  * |   2  |  type    |             |                     |             |                    |
  85  * +------+----------+-------------+---------------------+-------------+--------------------+
  86  *
  87  * Entry format is :
  88  *
  89  * |  1   |  1   |       4           |
  90  * +------+------+-------------------+
  91  * | ace  | value|  uid/gid or world |
  92  * | flag | type |  value            |
  93  * +------+-------------------+------+
  94  *
  95  */
  96
  97 #define PAI_VERSION_OFFSET                      0
  98
  99 #define PAI_V1_FLAG_OFFSET                      1
 100 #define PAI_V1_NUM_ENTRIES_OFFSET               2
 101 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET       4
 102 #define PAI_V1_ENTRIES_BASE                     6
 103 #define PAI_V1_ACL_FLAG_PROTECTED               0x1
 104 #define PAI_V1_ENTRY_LENGTH                     5
 105
 106 #define PAI_V1_VERSION                          1
 107
 108 #define PAI_V2_TYPE_OFFSET                      1
 109 #define PAI_V2_NUM_ENTRIES_OFFSET               3
 110 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET       5
 111 #define PAI_V2_ENTRIES_BASE                     7
 112 #define PAI_V2_ENTRY_LENGTH                     6
 113
 114 #define PAI_V2_VERSION                          2
 115
 116 /*
 117  * In memory format of user.SAMBA_PAI attribute.
 118  */
 119
 120 struct pai_entry {
 121         struct pai_entry *next, *prev;
 122         uint8_t ace_flags;
 123         enum ace_owner owner_type;
 124         posix_id unix_ug;
 125 };
 126
 127 struct pai_val {
 128         uint16_t sd_type;
 129         unsigned int num_entries;
 130         struct pai_entry *entry_list;
 131         unsigned int num_def_entries;
 132         struct pai_entry *def_entry_list;
 133 };
 134
 135 /************************************************************************
 136  Return a uint32 of the pai_entry principal.
 137 ************************************************************************/
 138
 139 static uint32_t get_pai_entry_val(struct pai_entry *paie)
 140 {
 141         switch (paie->owner_type) {
 142                 case UID_ACE:
 143                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 144                         return (uint32_t)paie->unix_ug.uid;
 145                 case GID_ACE:
 146                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 147                         return (uint32_t)paie->unix_ug.gid;
 148                 case WORLD_ACE:
 149                 default:
 150                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 151                         return (uint32_t)-1;
 152         }
 153 }
 154
 155 /************************************************************************
 156  Return a uint32 of the entry principal.
 157 ************************************************************************/
 158
 159 static uint32_t get_entry_val(canon_ace *ace_entry)
 160 {
 161         switch (ace_entry->owner_type) {
 162                 case UID_ACE:
 163                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
 164                         return (uint32_t)ace_entry->unix_ug.uid;
 165                 case GID_ACE:
 166                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
 167                         return (uint32_t)ace_entry->unix_ug.gid;
 168                 case WORLD_ACE:
 169                 default:
 170                         DEBUG(10,("get_entry_val: world ace\n"));
 171                         return (uint32_t)-1;
 172         }
 173 }
 174
 175 /************************************************************************
 176  Create the on-disk format (always v2 now). Caller must free.
 177 ************************************************************************/
 178
 179 static char *create_pai_buf_v2(canon_ace *file_ace_list,
 180                                 canon_ace *dir_ace_list,
 181                                 uint16_t sd_type,
 182                                 size_t *store_size)
 183 {
 184         char *pai_buf = NULL;
 185         canon_ace *ace_list = NULL;
 186         char *entry_offset = NULL;
 187         unsigned int num_entries = 0;
 188         unsigned int num_def_entries = 0;
 189         unsigned int i;
 190
 191         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 192                 num_entries++;
 193         }
 194
 195         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 196                 num_def_entries++;
 197         }
 198
 199         DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 200
 201         *store_size = PAI_V2_ENTRIES_BASE +
 202                 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
 203
 204         pai_buf = (char *)SMB_MALLOC(*store_size);
 205         if (!pai_buf) {
 206                 return NULL;
 207         }
 208
 209         /* Set up the header. */
 210         memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
 211         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
 212         SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
 213         SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
 214         SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 215
 216         DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
 217                         (unsigned int)sd_type ));
 218
 219         entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
 220
 221         i = 0;
 222         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 223                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 224                 uint32_t entry_val = get_entry_val(ace_list);
 225
 226                 SCVAL(entry_offset,0,ace_list->ace_flags);
 227                 SCVAL(entry_offset,1,type_val);
 228                 SIVAL(entry_offset,2,entry_val);
 229                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 230                         i,
 231                         (unsigned int)ace_list->ace_flags,
 232                         (unsigned int)type_val,
 233                         (unsigned int)entry_val ));
 234                 i++;
 235                 entry_offset += PAI_V2_ENTRY_LENGTH;
 236         }
 237
 238         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 239                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 240                 uint32_t entry_val = get_entry_val(ace_list);
 241
 242                 SCVAL(entry_offset,0,ace_list->ace_flags);
 243                 SCVAL(entry_offset,1,type_val);
 244                 SIVAL(entry_offset,2,entry_val);
 245                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 246                         i,
 247                         (unsigned int)ace_list->ace_flags,
 248                         (unsigned int)type_val,
 249                         (unsigned int)entry_val ));
 250                 i++;
 251                 entry_offset += PAI_V2_ENTRY_LENGTH;
 252         }
 253
 254         return pai_buf;
 255 }
 256
 257 /************************************************************************
 258  Store the user.SAMBA_PAI attribute on disk.
 259 ************************************************************************/
 260
 261 static void store_inheritance_attributes(files_struct *fsp,
 262                                         canon_ace *file_ace_list,
 263                                         canon_ace *dir_ace_list,
 264                                         uint16_t sd_type)
 265 {
 266         int ret;
 267         size_t store_size;
 268         char *pai_buf;
 269
 270         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 271                 return;
 272         }
 273
 274         pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
 275                                 sd_type, &store_size);
 276
 277         if (fsp->fh->fd != -1) {
 278                 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 279                                 pai_buf, store_size, 0);
 280         } else {
 281                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
 282                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 283                                        pai_buf, store_size, 0);
 284         }
 285
 286         SAFE_FREE(pai_buf);
 287
 288         DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
 289                 (unsigned int)sd_type,
 290                 fsp_str_dbg(fsp)));
 291
 292         if (ret == -1 && !no_acl_syscall_error(errno)) {
 293                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 294         }
 295 }
 296
 297 /************************************************************************
 298  Delete the in memory inheritance info.
 299 ************************************************************************/
 300
 301 static void free_inherited_info(struct pai_val *pal)
 302 {
 303         if (pal) {
 304                 struct pai_entry *paie, *paie_next;
 305                 for (paie = pal->entry_list; paie; paie = paie_next) {
 306                         paie_next = paie->next;
 307                         SAFE_FREE(paie);
 308                 }
 309                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 310                         paie_next = paie->next;
 311                         SAFE_FREE(paie);
 312                 }
 313                 SAFE_FREE(pal);
 314         }
 315 }
 316
 317 /************************************************************************
 318  Get any stored ACE flags.
 319 ************************************************************************/
 320
 321 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
 322 {
 323         struct pai_entry *paie;
 324
 325         if (!pal) {
 326                 return 0;
 327         }
 328
 329         /* If the entry exists it is inherited. */
 330         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 331                 if (ace_entry->owner_type == paie->owner_type &&
 332                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 333                         return paie->ace_flags;
 334         }
 335         return 0;
 336 }
 337
 338 /************************************************************************
 339  Ensure an attribute just read is valid - v1.
 340 ************************************************************************/
 341
 342 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
 343 {
 344         uint16 num_entries;
 345         uint16 num_def_entries;
 346
 347         if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
 348                 /* Corrupted - too small. */
 349                 return false;
 350         }
 351
 352         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
 353                 return false;
 354         }
 355
 356         num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
 357         num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 358
 359         /* Check the entry lists match. */
 360         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 361
 362         if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
 363                         PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
 364                 return false;
 365         }
 366
 367         return true;
 368 }
 369
 370 /************************************************************************
 371  Ensure an attribute just read is valid - v2.
 372 ************************************************************************/
 373
 374 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
 375 {
 376         uint16 num_entries;
 377         uint16 num_def_entries;
 378
 379         if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
 380                 /* Corrupted - too small. */
 381                 return false;
 382         }
 383
 384         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
 385                 return false;
 386         }
 387
 388         num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
 389         num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 390
 391         /* Check the entry lists match. */
 392         /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
 393
 394         if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
 395                         PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
 396                 return false;
 397         }
 398
 399         return true;
 400 }
 401
 402 /************************************************************************
 403  Decode the owner.
 404 ************************************************************************/
 405
 406 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
 407 {
 408         paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 409         switch( paie->owner_type) {
 410                 case UID_ACE:
 411                         paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 412                         DEBUG(10,("get_pai_owner_type: uid = %u\n",
 413                                 (unsigned int)paie->unix_ug.uid ));
 414                         break;
 415                 case GID_ACE:
 416                         paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 417                         DEBUG(10,("get_pai_owner_type: gid = %u\n",
 418                                 (unsigned int)paie->unix_ug.gid ));
 419                         break;
 420                 case WORLD_ACE:
 421                         paie->unix_ug.world = -1;
 422                         DEBUG(10,("get_pai_owner_type: world ace\n"));
 423                         break;
 424                 default:
 425                         DEBUG(10,("get_pai_owner_type: unknown type %u\n",
 426                                 (unsigned int)paie->owner_type ));
 427                         return false;
 428         }
 429         return true;
 430 }
 431
 432 /************************************************************************
 433  Process v2 entries.
 434 ************************************************************************/
 435
 436 static const char *create_pai_v1_entries(struct pai_val *paiv,
 437                                 const char *entry_offset,
 438                                 bool def_entry)
 439 {
 440         int i;
 441
 442         for (i = 0; i < paiv->num_entries; i++) {
 443                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 444                 if (!paie) {
 445                         return NULL;
 446                 }
 447
 448                 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
 449                 if (!get_pai_owner_type(paie, entry_offset)) {
 450                         SAFE_FREE(paie);
 451                         return NULL;
 452                 }
 453
 454                 if (!def_entry) {
 455                         DLIST_ADD(paiv->entry_list, paie);
 456                 } else {
 457                         DLIST_ADD(paiv->def_entry_list, paie);
 458                 }
 459                 entry_offset += PAI_V1_ENTRY_LENGTH;
 460         }
 461         return entry_offset;
 462 }
 463
 464 /************************************************************************
 465  Convert to in-memory format from version 1.
 466 ************************************************************************/
 467
 468 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
 469 {
 470         const char *entry_offset;
 471         struct pai_val *paiv = NULL;
 472
 473         if (!check_pai_ok_v1(buf, size)) {
 474                 return NULL;
 475         }
 476
 477         paiv = SMB_MALLOC_P(struct pai_val);
 478         if (!paiv) {
 479                 return NULL;
 480         }
 481
 482         memset(paiv, '\0', sizeof(struct pai_val));
 483
 484         paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
 485                         SEC_DESC_DACL_PROTECTED : 0;
 486
 487         paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
 488         paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 489
 490         entry_offset = buf + PAI_V1_ENTRIES_BASE;
 491
 492         DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
 493                         paiv->num_entries, paiv->num_def_entries ));
 494
 495         entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
 496         if (entry_offset == NULL) {
 497                 free_inherited_info(paiv);
 498                 return NULL;
 499         }
 500         entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
 501         if (entry_offset == NULL) {
 502                 free_inherited_info(paiv);
 503                 return NULL;
 504         }
 505
 506         return paiv;
 507 }
 508
 509 /************************************************************************
 510  Process v2 entries.
 511 ************************************************************************/
 512
 513 static const char *create_pai_v2_entries(struct pai_val *paiv,
 514                                 unsigned int num_entries,
 515                                 const char *entry_offset,
 516                                 bool def_entry)
 517 {
 518         unsigned int i;
 519
 520         for (i = 0; i < num_entries; i++) {
 521                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 522                 if (!paie) {
 523                         return NULL;
 524                 }
 525
 526                 paie->ace_flags = CVAL(entry_offset,0);
 527
 528                 if (!get_pai_owner_type(paie, entry_offset+1)) {
 529                         SAFE_FREE(paie);
 530                         return NULL;
 531                 }
 532                 if (!def_entry) {
 533                         DLIST_ADD(paiv->entry_list, paie);
 534                 } else {
 535                         DLIST_ADD(paiv->def_entry_list, paie);
 536                 }
 537                 entry_offset += PAI_V2_ENTRY_LENGTH;
 538         }
 539         return entry_offset;
 540 }
 541
 542 /************************************************************************
 543  Convert to in-memory format from version 2.
 544 ************************************************************************/
 545
 546 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
 547 {
 548         const char *entry_offset;
 549         struct pai_val *paiv = NULL;
 550
 551         if (!check_pai_ok_v2(buf, size)) {
 552                 return NULL;
 553         }
 554
 555         paiv = SMB_MALLOC_P(struct pai_val);
 556         if (!paiv) {
 557                 return NULL;
 558         }
 559
 560         memset(paiv, '\0', sizeof(struct pai_val));
 561
 562         paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
 563
 564         paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
 565         paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 566
 567         entry_offset = buf + PAI_V2_ENTRIES_BASE;
 568
 569         DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
 570                         (unsigned int)paiv->sd_type,
 571                         paiv->num_entries, paiv->num_def_entries ));
 572
 573         entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
 574                                 entry_offset, false);
 575         if (entry_offset == NULL) {
 576                 free_inherited_info(paiv);
 577                 return NULL;
 578         }
 579         entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
 580                                 entry_offset, true);
 581         if (entry_offset == NULL) {
 582                 free_inherited_info(paiv);
 583                 return NULL;
 584         }
 585
 586         return paiv;
 587 }
 588
 589 /************************************************************************
 590  Convert to in-memory format - from either version 1 or 2.
 591 ************************************************************************/
 592
 593 static struct pai_val *create_pai_val(const char *buf, size_t size)
 594 {
 595         if (size < 1) {
 596                 return NULL;
 597         }
 598         if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
 599                 return create_pai_val_v1(buf, size);
 600         } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
 601                 return create_pai_val_v2(buf, size);
 602         } else {
 603                 return NULL;
 604         }
 605 }
 606
 607 /************************************************************************
 608  Load the user.SAMBA_PAI attribute.
 609 ************************************************************************/
 610
 611 static struct pai_val *fload_inherited_info(files_struct *fsp)
 612 {
 613         char *pai_buf;
 614         size_t pai_buf_size = 1024;
 615         struct pai_val *paiv = NULL;
 616         ssize_t ret;
 617
 618         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 619                 return NULL;
 620         }
 621
 622         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 623                 return NULL;
 624         }
 625
 626         do {
 627                 if (fsp->fh->fd != -1) {
 628                         ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 629                                         pai_buf, pai_buf_size);
 630                 } else {
 631                         ret = SMB_VFS_GETXATTR(fsp->conn,
 632                                                fsp->fsp_name->base_name,
 633                                                SAMBA_POSIX_INHERITANCE_EA_NAME,
 634                                                pai_buf, pai_buf_size);
 635                 }
 636
 637                 if (ret == -1) {
 638                         if (errno != ERANGE) {
 639                                 break;
 640                         }
 641                         /* Buffer too small - enlarge it. */
 642                         pai_buf_size *= 2;
 643                         SAFE_FREE(pai_buf);
 644                         if (pai_buf_size > 1024*1024) {
 645                                 return NULL; /* Limit malloc to 1mb. */
 646                         }
 647                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 648                                 return NULL;
 649                 }
 650         } while (ret == -1);
 651
 652         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
 653                   (unsigned long)ret, fsp_str_dbg(fsp)));
 654
 655         if (ret == -1) {
 656                 /* No attribute or not supported. */
 657 #if defined(ENOATTR)
 658                 if (errno != ENOATTR)
 659                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 660 #else
 661                 if (errno != ENOSYS)
 662                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 663 #endif
 664                 SAFE_FREE(pai_buf);
 665                 return NULL;
 666         }
 667
 668         paiv = create_pai_val(pai_buf, ret);
 669
 670         if (paiv) {
 671                 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
 672                           (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
 673         }
 674
 675         SAFE_FREE(pai_buf);
 676         return paiv;
 677 }
 678
 679 /************************************************************************
 680  Load the user.SAMBA_PAI attribute.
 681 ************************************************************************/
 682
 683 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
 684                                            const char *fname)
 685 {
 686         char *pai_buf;
 687         size_t pai_buf_size = 1024;
 688         struct pai_val *paiv = NULL;
 689         ssize_t ret;
 690
 691         if (!lp_map_acl_inherit(SNUM(conn))) {
 692                 return NULL;
 693         }
 694
 695         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 696                 return NULL;
 697         }
 698
 699         do {
 700                 ret = SMB_VFS_GETXATTR(conn, fname,
 701                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 702                                        pai_buf, pai_buf_size);
 703
 704                 if (ret == -1) {
 705                         if (errno != ERANGE) {
 706                                 break;
 707                         }
 708                         /* Buffer too small - enlarge it. */
 709                         pai_buf_size *= 2;
 710                         SAFE_FREE(pai_buf);
 711                         if (pai_buf_size > 1024*1024) {
 712                                 return NULL; /* Limit malloc to 1mb. */
 713                         }
 714                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 715                                 return NULL;
 716                 }
 717         } while (ret == -1);
 718
 719         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
 720
 721         if (ret == -1) {
 722                 /* No attribute or not supported. */
 723 #if defined(ENOATTR)
 724                 if (errno != ENOATTR)
 725                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 726 #else
 727                 if (errno != ENOSYS)
 728                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 729 #endif
 730                 SAFE_FREE(pai_buf);
 731                 return NULL;
 732         }
 733
 734         paiv = create_pai_val(pai_buf, ret);
 735
 736         if (paiv) {
 737                 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
 738                         (unsigned int)paiv->sd_type,
 739                         fname));
 740         }
 741
 742         SAFE_FREE(pai_buf);
 743         return paiv;
 744 }
 745
 746 /****************************************************************************
 747  Functions to manipulate the internal ACE format.
 748 ****************************************************************************/
 749
 750 /****************************************************************************
 751  Count a linked list of canonical ACE entries.
 752 ****************************************************************************/
 753
 754 static size_t count_canon_ace_list( canon_ace *l_head )
 755 {
 756         size_t count = 0;
 757         canon_ace *ace;
 758
 759         for (ace = l_head; ace; ace = ace->next)
 760                 count++;
 761
 762         return count;
 763 }
 764
 765 /****************************************************************************
 766  Free a linked list of canonical ACE entries.
 767 ****************************************************************************/
 768
 769 static void free_canon_ace_list( canon_ace *l_head )
 770 {
 771         canon_ace *list, *next;
 772
 773         for (list = l_head; list; list = next) {
 774                 next = list->next;
 775                 DLIST_REMOVE(l_head, list);
 776                 SAFE_FREE(list);
 777         }
 778 }
 779
 780 /****************************************************************************
 781  Function to duplicate a canon_ace entry.
 782 ****************************************************************************/
 783
 784 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 785 {
 786         canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
 787
 788         if (dst_ace == NULL)
 789                 return NULL;
 790
 791         *dst_ace = *src_ace;
 792         dst_ace->prev = dst_ace->next = NULL;
 793         return dst_ace;
 794 }
 795
 796 /****************************************************************************
 797  Print out a canon ace.
 798 ****************************************************************************/
 799
 800 static void print_canon_ace(canon_ace *pace, int num)
 801 {
 802         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 803         dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
 804         if (pace->owner_type == UID_ACE) {
 805                 const char *u_name = uidtoname(pace->unix_ug.uid);
 806                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
 807         } else if (pace->owner_type == GID_ACE) {
 808                 char *g_name = gidtoname(pace->unix_ug.gid);
 809                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
 810         } else
 811                 dbgtext( "other ");
 812         switch (pace->type) {
 813                 case SMB_ACL_USER:
 814                         dbgtext( "SMB_ACL_USER ");
 815                         break;
 816                 case SMB_ACL_USER_OBJ:
 817                         dbgtext( "SMB_ACL_USER_OBJ ");
 818                         break;
 819                 case SMB_ACL_GROUP:
 820                         dbgtext( "SMB_ACL_GROUP ");
 821                         break;
 822                 case SMB_ACL_GROUP_OBJ:
 823                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 824                         break;
 825                 case SMB_ACL_OTHER:
 826                         dbgtext( "SMB_ACL_OTHER ");
 827                         break;
 828                 default:
 829                         dbgtext( "MASK " );
 830                         break;
 831         }
 832
 833         dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
 834         dbgtext( "perms ");
 835         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 836         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 837         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 838 }
 839
 840 /****************************************************************************
 841  Print out a canon ace list.
 842 ****************************************************************************/
 843
 844 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 845 {
 846         int count = 0;
 847
 848         if( DEBUGLVL( 10 )) {
 849                 dbgtext( "print_canon_ace_list: %s\n", name );
 850                 for (;ace_list; ace_list = ace_list->next, count++)
 851                         print_canon_ace(ace_list, count );
 852         }
 853 }
 854
 855 /****************************************************************************
 856  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 857 ****************************************************************************/
 858
 859 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
 860 {
 861         mode_t ret = 0;
 862
 863         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
 864         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 865         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 866
 867         return ret;
 868 }
 869
 870 /****************************************************************************
 871  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 872 ****************************************************************************/
 873
 874 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 875 {
 876         mode_t ret = 0;
 877
 878         if (mode & r_mask)
 879                 ret |= S_IRUSR;
 880         if (mode & w_mask)
 881                 ret |= S_IWUSR;
 882         if (mode & x_mask)
 883                 ret |= S_IXUSR;
 884
 885         return ret;
 886 }
 887
 888 /****************************************************************************
 889  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 890  an SMB_ACL_PERMSET_T.
 891 ****************************************************************************/
 892
 893 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 894 {
 895         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1)
 896                 return -1;
 897         if (mode & S_IRUSR) {
 898                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
 899                         return -1;
 900         }
 901         if (mode & S_IWUSR) {
 902                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
 903                         return -1;
 904         }
 905         if (mode & S_IXUSR) {
 906                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
 907                         return -1;
 908         }
 909         return 0;
 910 }
 911
 912 /****************************************************************************
 913  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 914 ****************************************************************************/
 915
 916 void create_file_sids(const SMB_STRUCT_STAT *psbuf, struct dom_sid *powner_sid, struct dom_sid *pgroup_sid)
 917 {
 918         uid_to_sid( powner_sid, psbuf->st_ex_uid );
 919         gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
 920 }
 921
 922 /****************************************************************************
 923  Merge aces with a common sid - if both are allow or deny, OR the permissions together and
 924  delete the second one. If the first is deny, mask the permissions off and delete the allow
 925  if the permissions become zero, delete the deny if the permissions are non zero.
 926 ****************************************************************************/
 927
 928 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
 929 {
 930         canon_ace *l_head = *pp_list_head;
 931         canon_ace *curr_ace_outer;
 932         canon_ace *curr_ace_outer_next;
 933
 934         /*
 935          * First, merge allow entries with identical SIDs, and deny entries
 936          * with identical SIDs.
 937          */
 938
 939         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 940                 canon_ace *curr_ace;
 941                 canon_ace *curr_ace_next;
 942
 943                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 944
 945                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 946                         bool can_merge = false;
 947
 948                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 949
 950                         /* For file ACLs we can merge if the SIDs and ALLOW/DENY
 951                          * types are the same. For directory acls we must also
 952                          * ensure the POSIX ACL types are the same. */
 953
 954                         if (!dir_acl) {
 955                                 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 956                                                 (curr_ace->attr == curr_ace_outer->attr));
 957                         } else {
 958                                 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 959                                                 (curr_ace->type == curr_ace_outer->type) &&
 960                                                 (curr_ace->attr == curr_ace_outer->attr));
 961                         }
 962
 963                         if (can_merge) {
 964                                 if( DEBUGLVL( 10 )) {
 965                                         dbgtext("merge_aces: Merging ACE's\n");
 966                                         print_canon_ace( curr_ace_outer, 0);
 967                                         print_canon_ace( curr_ace, 0);
 968                                 }
 969
 970                                 /* Merge two allow or two deny ACE's. */
 971
 972                                 /* Theoretically we shouldn't merge a dir ACE if
 973                                  * one ACE has the CI flag set, and the other
 974                                  * ACE has the OI flag set, but this is rare
 975                                  * enough we can ignore it. */
 976
 977                                 curr_ace_outer->perms |= curr_ace->perms;
 978                                 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
 979                                 DLIST_REMOVE(l_head, curr_ace);
 980                                 SAFE_FREE(curr_ace);
 981                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 982                         }
 983                 }
 984         }
 985
 986         /*
 987          * Now go through and mask off allow permissions with deny permissions.
 988          * We can delete either the allow or deny here as we know that each SID
 989          * appears only once in the list.
 990          */
 991
 992         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 993                 canon_ace *curr_ace;
 994                 canon_ace *curr_ace_next;
 995
 996                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 997
 998                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 999
1000                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1001
1002                         /*
1003                          * Subtract ACE's with different entries. Due to the ordering constraints
1004                          * we've put on the ACL, we know the deny must be the first one.
1005                          */
1006
1007                         if (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1008                                 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1009
1010                                 if( DEBUGLVL( 10 )) {
1011                                         dbgtext("merge_aces: Masking ACE's\n");
1012                                         print_canon_ace( curr_ace_outer, 0);
1013                                         print_canon_ace( curr_ace, 0);
1014                                 }
1015
1016                                 curr_ace->perms &= ~curr_ace_outer->perms;
1017
1018                                 if (curr_ace->perms == 0) {
1019
1020                                         /*
1021                                          * The deny overrides the allow. Remove the allow.
1022                                          */
1023
1024                                         DLIST_REMOVE(l_head, curr_ace);
1025                                         SAFE_FREE(curr_ace);
1026                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1027
1028                                 } else {
1029
1030                                         /*
1031                                          * Even after removing permissions, there
1032                                          * are still allow permissions - delete the deny.
1033                                          * It is safe to delete the deny here,
1034                                          * as we are guarenteed by the deny first
1035                                          * ordering that all the deny entries for
1036                                          * this SID have already been merged into one
1037                                          * before we can get to an allow ace.
1038                                          */
1039
1040                                         DLIST_REMOVE(l_head, curr_ace_outer);
1041                                         SAFE_FREE(curr_ace_outer);
1042                                         break;
1043                                 }
1044                         }
1045
1046                 } /* end for curr_ace */
1047         } /* end for curr_ace_outer */
1048
1049         /* We may have modified the list. */
1050
1051         *pp_list_head = l_head;
1052 }
1053
1054 /****************************************************************************
1055  Check if we need to return NT4.x compatible ACL entries.
1056 ****************************************************************************/
1057
1058 bool nt4_compatible_acls(void)
1059 {
1060         int compat = lp_acl_compatibility();
1061
1062         if (compat == ACL_COMPAT_AUTO) {
1063                 enum remote_arch_types ra_type = get_remote_arch();
1064
1065                 /* Automatically adapt to client */
1066                 return (ra_type <= RA_WINNT);
1067         } else
1068                 return (compat == ACL_COMPAT_WINNT);
1069 }
1070
1071
1072 /****************************************************************************
1073  Map canon_ace perms to permission bits NT.
1074  The attr element is not used here - we only process deny entries on set,
1075  not get. Deny entries are implicit on get with ace->perms = 0.
1076 ****************************************************************************/
1077
1078 uint32_t map_canon_ace_perms(int snum,
1079                                 enum security_ace_type *pacl_type,
1080                                 mode_t perms,
1081                                 bool directory_ace)
1082 {
1083         uint32_t nt_mask = 0;
1084
1085         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1086
1087         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1088                 if (directory_ace) {
1089                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1090                 } else {
1091                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1092                 }
1093         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1094                 /*
1095                  * Windows NT refuses to display ACEs with no permissions in them (but
1096                  * they are perfectly legal with Windows 2000). If the ACE has empty
1097                  * permissions we cannot use 0, so we use the otherwise unused
1098                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1099                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1100                  * to be changed in the future.
1101                  */
1102
1103                 if (nt4_compatible_acls())
1104                         nt_mask = UNIX_ACCESS_NONE;
1105                 else
1106                         nt_mask = 0;
1107         } else {
1108                 if (directory_ace) {
1109                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1110                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1111                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1112                 } else {
1113                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1114                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1115                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1116                 }
1117         }
1118
1119         if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1120                 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1121         }
1122
1123         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1124                         (unsigned int)perms, (unsigned int)nt_mask ));
1125
1126         return nt_mask;
1127 }
1128
1129 /****************************************************************************
1130  Map NT perms to a UNIX mode_t.
1131 ****************************************************************************/
1132
1133 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
1134 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
1135 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1136
1137 static mode_t map_nt_perms( uint32 *mask, int type)
1138 {
1139         mode_t mode = 0;
1140
1141         switch(type) {
1142         case S_IRUSR:
1143                 if((*mask) & GENERIC_ALL_ACCESS)
1144                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1145                 else {
1146                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1147                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1148                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1149                 }
1150                 break;
1151         case S_IRGRP:
1152                 if((*mask) & GENERIC_ALL_ACCESS)
1153                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1154                 else {
1155                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1156                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1157                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1158                 }
1159                 break;
1160         case S_IROTH:
1161                 if((*mask) & GENERIC_ALL_ACCESS)
1162                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1163                 else {
1164                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1165                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1166                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1167                 }
1168                 break;
1169         }
1170
1171         return mode;
1172 }
1173
1174 /****************************************************************************
1175  Unpack a struct security_descriptor into a UNIX owner and group.
1176 ****************************************************************************/
1177
1178 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1179                         uid_t *puser, gid_t *pgrp,
1180                         uint32 security_info_sent, const struct
1181                         security_descriptor *psd)
1182 {
1183         struct dom_sid owner_sid;
1184         struct dom_sid grp_sid;
1185
1186         *puser = (uid_t)-1;
1187         *pgrp = (gid_t)-1;
1188
1189         if(security_info_sent == 0) {
1190                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1191                 return NT_STATUS_OK;
1192         }
1193
1194         /*
1195          * Validate the owner and group SID's.
1196          */
1197
1198         memset(&owner_sid, '\0', sizeof(owner_sid));
1199         memset(&grp_sid, '\0', sizeof(grp_sid));
1200
1201         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1202
1203         /*
1204          * Don't immediately fail if the owner sid cannot be validated.
1205          * This may be a group chown only set.
1206          */
1207
1208         if (security_info_sent & SECINFO_OWNER) {
1209                 sid_copy(&owner_sid, psd->owner_sid);
1210                 if (!sid_to_uid(&owner_sid, puser)) {
1211                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1212                                 /* this allows take ownership to work
1213                                  * reasonably */
1214                                 *puser = get_current_uid(conn);
1215                         } else {
1216                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1217                                          " owner sid for %s\n",
1218                                          sid_string_dbg(&owner_sid)));
1219                                 return NT_STATUS_INVALID_OWNER;
1220                         }
1221                 }
1222                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1223                          (unsigned int)*puser ));
1224         }
1225
1226         /*
1227          * Don't immediately fail if the group sid cannot be validated.
1228          * This may be an owner chown only set.
1229          */
1230
1231         if (security_info_sent & SECINFO_GROUP) {
1232                 sid_copy(&grp_sid, psd->group_sid);
1233                 if (!sid_to_gid( &grp_sid, pgrp)) {
1234                         if (lp_force_unknown_acl_user(SNUM(conn))) {
1235                                 /* this allows take group ownership to work
1236                                  * reasonably */
1237                                 *pgrp = get_current_gid(conn);
1238                         } else {
1239                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1240                                          " group sid.\n"));
1241                                 return NT_STATUS_INVALID_OWNER;
1242                         }
1243                 }
1244                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1245                          (unsigned int)*pgrp));
1246         }
1247
1248         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1249
1250         return NT_STATUS_OK;
1251 }
1252
1253 /****************************************************************************
1254  Ensure the enforced permissions for this share apply.
1255 ****************************************************************************/
1256
1257 static void apply_default_perms(const struct share_params *params,
1258                                 const bool is_directory, canon_ace *pace,
1259                                 mode_t type)
1260 {
1261         mode_t and_bits = (mode_t)0;
1262         mode_t or_bits = (mode_t)0;
1263
1264         /* Get the initial bits to apply. */
1265
1266         if (is_directory) {
1267                 and_bits = lp_dir_security_mask(params->service);
1268                 or_bits = lp_force_dir_security_mode(params->service);
1269         } else {
1270                 and_bits = lp_security_mask(params->service);
1271                 or_bits = lp_force_security_mode(params->service);
1272         }
1273
1274         /* Now bounce them into the S_USR space. */
1275         switch(type) {
1276         case S_IRUSR:
1277                 /* Ensure owner has read access. */
1278                 pace->perms |= S_IRUSR;
1279                 if (is_directory)
1280                         pace->perms |= (S_IWUSR|S_IXUSR);
1281                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1282                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1283                 break;
1284         case S_IRGRP:
1285                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1286                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1287                 break;
1288         case S_IROTH:
1289                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1290                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1291                 break;
1292         }
1293
1294         pace->perms = ((pace->perms & and_bits)|or_bits);
1295 }
1296
1297 /****************************************************************************
1298  Check if a given uid/SID is in a group gid/SID. This is probably very
1299  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1300 ****************************************************************************/
1301
1302 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1303 {
1304         const char *u_name = NULL;
1305
1306         /* "Everyone" always matches every uid. */
1307
1308         if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1309                 return True;
1310
1311         /*
1312          * if it's the current user, we already have the unix token
1313          * and don't need to do the complex user_in_group_sid() call
1314          */
1315         if (uid_ace->unix_ug.uid == get_current_uid(conn)) {
1316                 const struct security_unix_token *curr_utok = NULL;
1317                 size_t i;
1318
1319                 if (group_ace->unix_ug.gid == get_current_gid(conn)) {
1320                         return True;
1321                 }
1322
1323                 curr_utok = get_current_utok(conn);
1324                 for (i=0; i < curr_utok->ngroups; i++) {
1325                         if (group_ace->unix_ug.gid == curr_utok->groups[i]) {
1326                                 return True;
1327                         }
1328                 }
1329         }
1330
1331         /* u_name talloc'ed off tos. */
1332         u_name = uidtoname(uid_ace->unix_ug.uid);
1333         if (!u_name) {
1334                 return False;
1335         }
1336
1337         /*
1338          * user_in_group_sid() uses create_token_from_username()
1339          * which creates an artificial NT token given just a username,
1340          * so this is not reliable for users from foreign domains
1341          * exported by winbindd!
1342          */
1343         return user_in_group_sid(u_name, &group_ace->trustee);
1344 }
1345
1346 /****************************************************************************
1347  A well formed POSIX file or default ACL has at least 3 entries, a
1348  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1349  In addition, the owner must always have at least read access.
1350  When using this call on get_acl, the pst struct is valid and contains
1351  the mode of the file. When using this call on set_acl, the pst struct has
1352  been modified to have a mode containing the default for this file or directory
1353  type.
1354 ****************************************************************************/
1355
1356 static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
1357                                      const struct share_params *params,
1358                                      const bool is_directory,
1359                                                         const struct dom_sid *pfile_owner_sid,
1360                                                         const struct dom_sid *pfile_grp_sid,
1361                                                         const SMB_STRUCT_STAT *pst,
1362                                                         bool setting_acl)
1363 {
1364         canon_ace *pace;
1365         bool got_user = False;
1366         bool got_grp = False;
1367         bool got_other = False;
1368         canon_ace *pace_other = NULL;
1369
1370         for (pace = *pp_ace; pace; pace = pace->next) {
1371                 if (pace->type == SMB_ACL_USER_OBJ) {
1372
1373                         if (setting_acl)
1374                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1375                         got_user = True;
1376
1377                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1378
1379                         /*
1380                          * Ensure create mask/force create mode is respected on set.
1381                          */
1382
1383                         if (setting_acl)
1384                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1385                         got_grp = True;
1386
1387                 } else if (pace->type == SMB_ACL_OTHER) {
1388
1389                         /*
1390                          * Ensure create mask/force create mode is respected on set.
1391                          */
1392
1393                         if (setting_acl)
1394                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1395                         got_other = True;
1396                         pace_other = pace;
1397                 }
1398         }
1399
1400         if (!got_user) {
1401                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1402                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1403                         return False;
1404                 }
1405
1406                 ZERO_STRUCTP(pace);
1407                 pace->type = SMB_ACL_USER_OBJ;
1408                 pace->owner_type = UID_ACE;
1409                 pace->unix_ug.uid = pst->st_ex_uid;
1410                 pace->trustee = *pfile_owner_sid;
1411                 pace->attr = ALLOW_ACE;
1412
1413                 if (setting_acl) {
1414                         /* See if the owning user is in any of the other groups in
1415                            the ACE. If so, OR in the permissions from that group. */
1416
1417                         bool group_matched = False;
1418                         canon_ace *pace_iter;
1419
1420                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1421                                 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1422                                         if (uid_entry_in_group(conn, pace, pace_iter)) {
1423                                                 pace->perms |= pace_iter->perms;
1424                                                 group_matched = True;
1425                                         }
1426                                 }
1427                         }
1428
1429                         /* If we only got an "everyone" perm, just use that. */
1430                         if (!group_matched) {
1431                                 if (got_other)
1432                                         pace->perms = pace_other->perms;
1433                                 else
1434                                         pace->perms = 0;
1435                         }
1436
1437                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1438                 } else {
1439                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1440                 }
1441
1442                 DLIST_ADD(*pp_ace, pace);
1443         }
1444
1445         if (!got_grp) {
1446                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1447                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1448                         return False;
1449                 }
1450
1451                 ZERO_STRUCTP(pace);
1452                 pace->type = SMB_ACL_GROUP_OBJ;
1453                 pace->owner_type = GID_ACE;
1454                 pace->unix_ug.uid = pst->st_ex_gid;
1455                 pace->trustee = *pfile_grp_sid;
1456                 pace->attr = ALLOW_ACE;
1457                 if (setting_acl) {
1458                         /* If we only got an "everyone" perm, just use that. */
1459                         if (got_other)
1460                                 pace->perms = pace_other->perms;
1461                         else
1462                                 pace->perms = 0;
1463                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1464                 } else {
1465                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1466                 }
1467
1468                 DLIST_ADD(*pp_ace, pace);
1469         }
1470
1471         if (!got_other) {
1472                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1473                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1474                         return False;
1475                 }
1476
1477                 ZERO_STRUCTP(pace);
1478                 pace->type = SMB_ACL_OTHER;
1479                 pace->owner_type = WORLD_ACE;
1480                 pace->unix_ug.world = -1;
1481                 pace->trustee = global_sid_World;
1482                 pace->attr = ALLOW_ACE;
1483                 if (setting_acl) {
1484                         pace->perms = 0;
1485                         apply_default_perms(params, is_directory, pace, S_IROTH);
1486                 } else
1487                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1488
1489                 DLIST_ADD(*pp_ace, pace);
1490         }
1491
1492         return True;
1493 }
1494
1495 /****************************************************************************
1496  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1497  If it does not have them, check if there are any entries where the trustee is the
1498  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1499 ****************************************************************************/
1500
1501 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1502 {
1503         bool got_user_obj, got_group_obj;
1504         canon_ace *current_ace;
1505         int i, entries;
1506
1507         entries = count_canon_ace_list(ace);
1508         got_user_obj = False;
1509         got_group_obj = False;
1510
1511         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1512                 if (current_ace->type == SMB_ACL_USER_OBJ)
1513                         got_user_obj = True;
1514                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1515                         got_group_obj = True;
1516         }
1517         if (got_user_obj && got_group_obj) {
1518                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1519                 return;
1520         }
1521
1522         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1523                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1524                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1525                         current_ace->type = SMB_ACL_USER_OBJ;
1526                         got_user_obj = True;
1527                 }
1528                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1529                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1530                         current_ace->type = SMB_ACL_GROUP_OBJ;
1531                         got_group_obj = True;
1532                 }
1533         }
1534         if (!got_user_obj)
1535                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1536         if (!got_group_obj)
1537                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1538 }
1539
1540 /****************************************************************************
1541  Unpack a struct security_descriptor into two canonical ace lists.
1542 ****************************************************************************/
1543
1544 static bool create_canon_ace_lists(files_struct *fsp,
1545                                         const SMB_STRUCT_STAT *pst,
1546                                         struct dom_sid *pfile_owner_sid,
1547                                         struct dom_sid *pfile_grp_sid,
1548                                         canon_ace **ppfile_ace,
1549                                         canon_ace **ppdir_ace,
1550                                         const struct security_acl *dacl)
1551 {
1552         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1553         canon_ace *file_ace = NULL;
1554         canon_ace *dir_ace = NULL;
1555         canon_ace *current_ace = NULL;
1556         bool got_dir_allow = False;
1557         bool got_file_allow = False;
1558         int i, j;
1559
1560         *ppfile_ace = NULL;
1561         *ppdir_ace = NULL;
1562
1563         /*
1564          * Convert the incoming ACL into a more regular form.
1565          */
1566
1567         for(i = 0; i < dacl->num_aces; i++) {
1568                 struct security_ace *psa = &dacl->aces[i];
1569
1570                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1571                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1572                         return False;
1573                 }
1574
1575                 if (nt4_compatible_acls()) {
1576                         /*
1577                          * The security mask may be UNIX_ACCESS_NONE which should map into
1578                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1579                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1580                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1581                          */
1582
1583                         /*
1584                          * Convert GENERIC bits to specific bits.
1585                          */
1586
1587                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1588
1589                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1590
1591                         if(psa->access_mask != UNIX_ACCESS_NONE)
1592                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1593                 }
1594         }
1595
1596         /*
1597          * Deal with the fact that NT 4.x re-writes the canonical format
1598          * that we return for default ACLs. If a directory ACE is identical
1599          * to a inherited directory ACE then NT changes the bits so that the
1600          * first ACE is set to OI|IO and the second ACE for this SID is set
1601          * to CI. We need to repair this. JRA.
1602          */
1603
1604         for(i = 0; i < dacl->num_aces; i++) {
1605                 struct security_ace *psa1 = &dacl->aces[i];
1606
1607                 for (j = i + 1; j < dacl->num_aces; j++) {
1608                         struct security_ace *psa2 = &dacl->aces[j];
1609
1610                         if (psa1->access_mask != psa2->access_mask)
1611                                 continue;
1612
1613                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1614                                 continue;
1615
1616                         /*
1617                          * Ok - permission bits and SIDs are equal.
1618                          * Check if flags were re-written.
1619                          */
1620
1621                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1622
1623                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1624                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1625
1626                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1627
1628                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1629                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1630
1631                         }
1632                 }
1633         }
1634
1635         for(i = 0; i < dacl->num_aces; i++) {
1636                 struct security_ace *psa = &dacl->aces[i];
1637
1638                 /*
1639                  * Create a canon_ace entry representing this NT DACL ACE.
1640                  */
1641
1642                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1643                         free_canon_ace_list(file_ace);
1644                         free_canon_ace_list(dir_ace);
1645                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1646                         return False;
1647                 }
1648
1649                 ZERO_STRUCTP(current_ace);
1650
1651                 sid_copy(&current_ace->trustee, &psa->trustee);
1652
1653                 /*
1654                  * Try and work out if the SID is a user or group
1655                  * as we need to flag these differently for POSIX.
1656                  * Note what kind of a POSIX ACL this should map to.
1657                  */
1658
1659                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1660                         current_ace->owner_type = WORLD_ACE;
1661                         current_ace->unix_ug.world = -1;
1662                         current_ace->type = SMB_ACL_OTHER;
1663                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1664                         current_ace->owner_type = UID_ACE;
1665                         current_ace->unix_ug.uid = pst->st_ex_uid;
1666                         current_ace->type = SMB_ACL_USER_OBJ;
1667
1668                         /*
1669                          * The Creator Owner entry only specifies inheritable permissions,
1670                          * never access permissions. WinNT doesn't always set the ACE to
1671                          * INHERIT_ONLY, though.
1672                          */
1673
1674                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1675
1676                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1677                         current_ace->owner_type = GID_ACE;
1678                         current_ace->unix_ug.gid = pst->st_ex_gid;
1679                         current_ace->type = SMB_ACL_GROUP_OBJ;
1680
1681                         /*
1682                          * The Creator Group entry only specifies inheritable permissions,
1683                          * never access permissions. WinNT doesn't always set the ACE to
1684                          * INHERIT_ONLY, though.
1685                          */
1686                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1687
1688                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1689                         current_ace->owner_type = UID_ACE;
1690                         /* If it's the owning user, this is a user_obj, not
1691                          * a user. */
1692                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1693                                 current_ace->type = SMB_ACL_USER_OBJ;
1694                         } else {
1695                                 current_ace->type = SMB_ACL_USER;
1696                         }
1697                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1698                         current_ace->owner_type = GID_ACE;
1699                         /* If it's the primary group, this is a group_obj, not
1700                          * a group. */
1701                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1702                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1703                         } else {
1704                                 current_ace->type = SMB_ACL_GROUP;
1705                         }
1706                 } else {
1707                         /*
1708                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1709                          */
1710
1711                         if (non_mappable_sid(&psa->trustee)) {
1712                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1713                                            "non-mappable SID %s\n",
1714                                            sid_string_dbg(&psa->trustee)));
1715                                 SAFE_FREE(current_ace);
1716                                 continue;
1717                         }
1718
1719                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1720                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1721                                         "unknown or foreign SID %s\n",
1722                                         sid_string_dbg(&psa->trustee)));
1723                                 SAFE_FREE(current_ace);
1724                                 continue;
1725                         }
1726
1727                         free_canon_ace_list(file_ace);
1728                         free_canon_ace_list(dir_ace);
1729                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1730                                   "%s to uid or gid.\n",
1731                                   sid_string_dbg(&current_ace->trustee)));
1732                         SAFE_FREE(current_ace);
1733                         return False;
1734                 }
1735
1736                 /*
1737                  * Map the given NT permissions into a UNIX mode_t containing only
1738                  * S_I(R|W|X)USR bits.
1739                  */
1740
1741                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1742                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1743
1744                 /* Store the ace_flag. */
1745                 current_ace->ace_flags = psa->flags;
1746
1747                 /*
1748                  * Now add the created ace to either the file list, the directory
1749                  * list, or both. We *MUST* preserve the order here (hence we use
1750                  * DLIST_ADD_END) as NT ACLs are order dependent.
1751                  */
1752
1753                 if (fsp->is_directory) {
1754
1755                         /*
1756                          * We can only add to the default POSIX ACE list if the ACE is
1757                          * designed to be inherited by both files and directories.
1758                          */
1759
1760                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1761                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1762
1763                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1764
1765                                 /*
1766                                  * Note if this was an allow ace. We can't process
1767                                  * any further deny ace's after this.
1768                                  */
1769
1770                                 if (current_ace->attr == ALLOW_ACE)
1771                                         got_dir_allow = True;
1772
1773                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1774                                         DEBUG(0,("create_canon_ace_lists: "
1775                                                  "malformed ACL in "
1776                                                  "inheritable ACL! Deny entry "
1777                                                  "after Allow entry. Failing "
1778                                                  "to set on file %s.\n",
1779                                                  fsp_str_dbg(fsp)));
1780                                         free_canon_ace_list(file_ace);
1781                                         free_canon_ace_list(dir_ace);
1782                                         return False;
1783                                 }
1784
1785                                 if( DEBUGLVL( 10 )) {
1786                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1787                                         print_canon_ace( current_ace, 0);
1788                                 }
1789
1790                                 /*
1791                                  * If this is not an inherit only ACE we need to add a duplicate
1792                                  * to the file acl.
1793                                  */
1794
1795                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1796                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1797
1798                                         if (!dup_ace) {
1799                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1800                                                 free_canon_ace_list(file_ace);
1801                                                 free_canon_ace_list(dir_ace);
1802                                                 return False;
1803                                         }
1804
1805                                         /*
1806                                          * We must not free current_ace here as its
1807                                          * pointer is now owned by the dir_ace list.
1808                                          */
1809                                         current_ace = dup_ace;
1810                                         /* We've essentially split this ace into two,
1811                                          * and added the ace with inheritance request
1812                                          * bits to the directory ACL. Drop those bits for
1813                                          * the ACE we're adding to the file list. */
1814                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1815                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1816                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1817                                 } else {
1818                                         /*
1819                                          * We must not free current_ace here as its
1820                                          * pointer is now owned by the dir_ace list.
1821                                          */
1822                                         current_ace = NULL;
1823                                 }
1824                         }
1825                 }
1826
1827                 /*
1828                  * Only add to the file ACL if not inherit only.
1829                  */
1830
1831                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1832                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1833
1834                         /*
1835                          * Note if this was an allow ace. We can't process
1836                          * any further deny ace's after this.
1837                          */
1838
1839                         if (current_ace->attr == ALLOW_ACE)
1840                                 got_file_allow = True;
1841
1842                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1843                                 DEBUG(0,("create_canon_ace_lists: malformed "
1844                                          "ACL in file ACL ! Deny entry after "
1845                                          "Allow entry. Failing to set on file "
1846                                          "%s.\n", fsp_str_dbg(fsp)));
1847                                 free_canon_ace_list(file_ace);
1848                                 free_canon_ace_list(dir_ace);
1849                                 return False;
1850                         }
1851
1852                         if( DEBUGLVL( 10 )) {
1853                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1854                                 print_canon_ace( current_ace, 0);
1855                         }
1856                         all_aces_are_inherit_only = False;
1857                         /*
1858                          * We must not free current_ace here as its
1859                          * pointer is now owned by the file_ace list.
1860                          */
1861                         current_ace = NULL;
1862                 }
1863
1864                 /*
1865                  * Free if ACE was not added.
1866                  */
1867
1868                 SAFE_FREE(current_ace);
1869         }
1870
1871         if (fsp->is_directory && all_aces_are_inherit_only) {
1872                 /*
1873                  * Windows 2000 is doing one of these weird 'inherit acl'
1874                  * traverses to conserve NTFS ACL resources. Just pretend
1875                  * there was no DACL sent. JRA.
1876                  */
1877
1878                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1879                 free_canon_ace_list(file_ace);
1880                 free_canon_ace_list(dir_ace);
1881                 file_ace = NULL;
1882                 dir_ace = NULL;
1883         } else {
1884                 /*
1885                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1886                  * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1887                  * entries can be converted to *_OBJ. Usually we will already have these
1888                  * entries in the Default ACL, and the Access ACL will not have them.
1889                  */
1890                 if (file_ace) {
1891                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1892                 }
1893                 if (dir_ace) {
1894                         check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1895                 }
1896         }
1897
1898         *ppfile_ace = file_ace;
1899         *ppdir_ace = dir_ace;
1900
1901         return True;
1902 }
1903
1904 /****************************************************************************
1905  ASCII art time again... JRA :-).
1906
1907  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1908  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1909  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1910  allow or deny have been merged, so the same SID can only appear once in the deny
1911  list or once in the allow list.
1912
1913  We then process as follows :
1914
1915  ---------------------------------------------------------------------------
1916  First pass - look for a Everyone DENY entry.
1917
1918  If it is deny all (rwx) trunate the list at this point.
1919  Else, walk the list from this point and use the deny permissions of this
1920  entry as a mask on all following allow entries. Finally, delete
1921  the Everyone DENY entry (we have applied it to everything possible).
1922
1923  In addition, in this pass we remove any DENY entries that have
1924  no permissions (ie. they are a DENY nothing).
1925  ---------------------------------------------------------------------------
1926  Second pass - only deal with deny user entries.
1927
1928  DENY user1 (perms XXX)
1929
1930  new_perms = 0
1931  for all following allow group entries where user1 is in group
1932         new_perms |= group_perms;
1933
1934  user1 entry perms = new_perms & ~ XXX;
1935
1936  Convert the deny entry to an allow entry with the new perms and
1937  push to the end of the list. Note if the user was in no groups
1938  this maps to a specific allow nothing entry for this user.
1939
1940  The common case from the NT ACL choser (userX deny all) is
1941  optimised so we don't do the group lookup - we just map to
1942  an allow nothing entry.
1943
1944  What we're doing here is inferring the allow permissions the
1945  person setting the ACE on user1 wanted by looking at the allow
1946  permissions on the groups the user is currently in. This will
1947  be a snapshot, depending on group membership but is the best
1948  we can do and has the advantage of failing closed rather than
1949  open.
1950  ---------------------------------------------------------------------------
1951  Third pass - only deal with deny group entries.
1952
1953  DENY group1 (perms XXX)
1954
1955  for all following allow user entries where user is in group1
1956    user entry perms = user entry perms & ~ XXX;
1957
1958  If there is a group Everyone allow entry with permissions YYY,
1959  convert the group1 entry to an allow entry and modify its
1960  permissions to be :
1961
1962  new_perms = YYY & ~ XXX
1963
1964  and push to the end of the list.
1965
1966  If there is no group Everyone allow entry then convert the
1967  group1 entry to a allow nothing entry and push to the end of the list.
1968
1969  Note that the common case from the NT ACL choser (groupX deny all)
1970  cannot be optimised here as we need to modify user entries who are
1971  in the group to change them to a deny all also.
1972
1973  What we're doing here is modifying the allow permissions of
1974  user entries (which are more specific in POSIX ACLs) to mask
1975  out the explicit deny set on the group they are in. This will
1976  be a snapshot depending on current group membership but is the
1977  best we can do and has the advantage of failing closed rather
1978  than open.
1979  ---------------------------------------------------------------------------
1980  Fourth pass - cope with cumulative permissions.
1981
1982  for all allow user entries, if there exists an allow group entry with
1983  more permissive permissions, and the user is in that group, rewrite the
1984  allow user permissions to contain both sets of permissions.
1985
1986  Currently the code for this is #ifdef'ed out as these semantics make
1987  no sense to me. JRA.
1988  ---------------------------------------------------------------------------
1989
1990  Note we *MUST* do the deny user pass first as this will convert deny user
1991  entries into allow user entries which can then be processed by the deny
1992  group pass.
1993
1994  The above algorithm took a *lot* of thinking about - hence this
1995  explaination :-). JRA.
1996 ****************************************************************************/
1997
1998 /****************************************************************************
1999  Process a canon_ace list entries. This is very complex code. We need
2000  to go through and remove the "deny" permissions from any allow entry that matches
2001  the id of this entry. We have already refused any NT ACL that wasn't in correct
2002  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2003  we just remove it (to fail safe). We have already removed any duplicate ace
2004  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2005  allow entries.
2006 ****************************************************************************/
2007
2008 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2009 {
2010         canon_ace *ace_list = *pp_ace_list;
2011         canon_ace *curr_ace = NULL;
2012         canon_ace *curr_ace_next = NULL;
2013
2014         /* Pass 1 above - look for an Everyone, deny entry. */
2015
2016         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2017                 canon_ace *allow_ace_p;
2018
2019                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2020
2021                 if (curr_ace->attr != DENY_ACE)
2022                         continue;
2023
2024                 if (curr_ace->perms == (mode_t)0) {
2025
2026                         /* Deny nothing entry - delete. */
2027
2028                         DLIST_REMOVE(ace_list, curr_ace);
2029                         continue;
2030                 }
2031
2032                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2033                         continue;
2034
2035                 /* JRATEST - assert. */
2036                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2037
2038                 if (curr_ace->perms == ALL_ACE_PERMS) {
2039
2040                         /*
2041                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2042                          * list at this point including this entry.
2043                          */
2044
2045                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2046
2047                         free_canon_ace_list( curr_ace );
2048                         if (prev_entry)
2049                                 DLIST_REMOVE(ace_list, prev_entry);
2050                         else {
2051                                 /* We deleted the entire list. */
2052                                 ace_list = NULL;
2053                         }
2054                         break;
2055                 }
2056
2057                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2058
2059                         /*
2060                          * Only mask off allow entries.
2061                          */
2062
2063                         if (allow_ace_p->attr != ALLOW_ACE)
2064                                 continue;
2065
2066                         allow_ace_p->perms &= ~curr_ace->perms;
2067                 }
2068
2069                 /*
2070                  * Now it's been applied, remove it.
2071                  */
2072
2073                 DLIST_REMOVE(ace_list, curr_ace);
2074         }
2075
2076         /* Pass 2 above - deal with deny user entries. */
2077
2078         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2079                 mode_t new_perms = (mode_t)0;
2080                 canon_ace *allow_ace_p;
2081
2082                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2083
2084                 if (curr_ace->attr != DENY_ACE)
2085                         continue;
2086
2087                 if (curr_ace->owner_type != UID_ACE)
2088                         continue;
2089
2090                 if (curr_ace->perms == ALL_ACE_PERMS) {
2091
2092                         /*
2093                          * Optimisation - this is a deny everything to this user.
2094                          * Convert to an allow nothing and push to the end of the list.
2095                          */
2096
2097                         curr_ace->attr = ALLOW_ACE;
2098                         curr_ace->perms = (mode_t)0;
2099                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2100                         continue;
2101                 }
2102
2103                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2104
2105                         if (allow_ace_p->attr != ALLOW_ACE)
2106                                 continue;
2107
2108                         /* We process GID_ACE and WORLD_ACE entries only. */
2109
2110                         if (allow_ace_p->owner_type == UID_ACE)
2111                                 continue;
2112
2113                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2114                                 new_perms |= allow_ace_p->perms;
2115                 }
2116
2117                 /*
2118                  * Convert to a allow entry, modify the perms and push to the end
2119                  * of the list.
2120                  */
2121
2122                 curr_ace->attr = ALLOW_ACE;
2123                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2124                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2125         }
2126
2127         /* Pass 3 above - deal with deny group entries. */
2128
2129         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2130                 canon_ace *allow_ace_p;
2131                 canon_ace *allow_everyone_p = NULL;
2132
2133                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2134
2135                 if (curr_ace->attr != DENY_ACE)
2136                         continue;
2137
2138                 if (curr_ace->owner_type != GID_ACE)
2139                         continue;
2140
2141                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2142
2143                         if (allow_ace_p->attr != ALLOW_ACE)
2144                                 continue;
2145
2146                         /* Store a pointer to the Everyone allow, if it exists. */
2147                         if (allow_ace_p->owner_type == WORLD_ACE)
2148                                 allow_everyone_p = allow_ace_p;
2149
2150                         /* We process UID_ACE entries only. */
2151
2152                         if (allow_ace_p->owner_type != UID_ACE)
2153                                 continue;
2154
2155                         /* Mask off the deny group perms. */
2156
2157                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2158                                 allow_ace_p->perms &= ~curr_ace->perms;
2159                 }
2160
2161                 /*
2162                  * Convert the deny to an allow with the correct perms and
2163                  * push to the end of the list.
2164                  */
2165
2166                 curr_ace->attr = ALLOW_ACE;
2167                 if (allow_everyone_p)
2168                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2169                 else
2170                         curr_ace->perms = (mode_t)0;
2171                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2172         }
2173
2174         /* Doing this fourth pass allows Windows semantics to be layered
2175          * on top of POSIX semantics. I'm not sure if this is desirable.
2176          * For example, in W2K ACLs there is no way to say, "Group X no
2177          * access, user Y full access" if user Y is a member of group X.
2178          * This seems completely broken semantics to me.... JRA.
2179          */
2180
2181 #if 0
2182         /* Pass 4 above - deal with allow entries. */
2183
2184         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2185                 canon_ace *allow_ace_p;
2186
2187                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2188
2189                 if (curr_ace->attr != ALLOW_ACE)
2190                         continue;
2191
2192                 if (curr_ace->owner_type != UID_ACE)
2193                         continue;
2194
2195                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2196
2197                         if (allow_ace_p->attr != ALLOW_ACE)
2198                                 continue;
2199
2200                         /* We process GID_ACE entries only. */
2201
2202                         if (allow_ace_p->owner_type != GID_ACE)
2203                                 continue;
2204
2205                         /* OR in the group perms. */
2206
2207                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2208                                 curr_ace->perms |= allow_ace_p->perms;
2209                 }
2210         }
2211 #endif
2212
2213         *pp_ace_list = ace_list;
2214 }
2215
2216 /****************************************************************************
2217  Create a default mode that will be used if a security descriptor entry has
2218  no user/group/world entries.
2219 ****************************************************************************/
2220
2221 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2222 {
2223         int snum = SNUM(fsp->conn);
2224         mode_t and_bits = (mode_t)0;
2225         mode_t or_bits = (mode_t)0;
2226         mode_t mode;
2227
2228         if (interitable_mode) {
2229                 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2230                                  fsp->fsp_name, NULL);
2231         } else {
2232                 mode = S_IRUSR;
2233         }
2234
2235         if (fsp->is_directory)
2236                 mode |= (S_IWUSR|S_IXUSR);
2237
2238         /*
2239          * Now AND with the create mode/directory mode bits then OR with the
2240          * force create mode/force directory mode bits.
2241          */
2242
2243         if (fsp->is_directory) {
2244                 and_bits = lp_dir_security_mask(snum);
2245                 or_bits = lp_force_dir_security_mode(snum);
2246         } else {
2247                 and_bits = lp_security_mask(snum);
2248                 or_bits = lp_force_security_mode(snum);
2249         }
2250
2251         return ((mode & and_bits)|or_bits);
2252 }
2253
2254 /****************************************************************************
2255  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2256  succeeding.
2257 ****************************************************************************/
2258
2259 static bool unpack_canon_ace(files_struct *fsp,
2260                                 const SMB_STRUCT_STAT *pst,
2261                                 struct dom_sid *pfile_owner_sid,
2262                                 struct dom_sid *pfile_grp_sid,
2263                                 canon_ace **ppfile_ace,
2264                                 canon_ace **ppdir_ace,
2265                                 uint32 security_info_sent,
2266                                 const struct security_descriptor *psd)
2267 {
2268         SMB_STRUCT_STAT st;
2269         canon_ace *file_ace = NULL;
2270         canon_ace *dir_ace = NULL;
2271
2272         *ppfile_ace = NULL;
2273         *ppdir_ace = NULL;
2274
2275         if(security_info_sent == 0) {
2276                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2277                 return False;
2278         }
2279
2280         /*
2281          * If no DACL then this is a chown only security descriptor.
2282          */
2283
2284         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2285                 return True;
2286
2287         /*
2288          * Now go through the DACL and create the canon_ace lists.
2289          */
2290
2291         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2292                                                                 &file_ace, &dir_ace, psd->dacl))
2293                 return False;
2294
2295         if ((file_ace == NULL) && (dir_ace == NULL)) {
2296                 /* W2K traverse DACL set - ignore. */
2297                 return True;
2298         }
2299
2300         /*
2301          * Go through the canon_ace list and merge entries
2302          * belonging to identical users of identical allow or deny type.
2303          * We can do this as all deny entries come first, followed by
2304          * all allow entries (we have mandated this before accepting this acl).
2305          */
2306
2307         print_canon_ace_list( "file ace - before merge", file_ace);
2308         merge_aces( &file_ace, false);
2309
2310         print_canon_ace_list( "dir ace - before merge", dir_ace);
2311         merge_aces( &dir_ace, true);
2312
2313         /*
2314          * NT ACLs are order dependent. Go through the acl lists and
2315          * process DENY entries by masking the allow entries.
2316          */
2317
2318         print_canon_ace_list( "file ace - before deny", file_ace);
2319         process_deny_list(fsp->conn, &file_ace);
2320
2321         print_canon_ace_list( "dir ace - before deny", dir_ace);
2322         process_deny_list(fsp->conn, &dir_ace);
2323
2324         /*
2325          * A well formed POSIX file or default ACL has at least 3 entries, a
2326          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2327          * and optionally a mask entry. Ensure this is the case.
2328          */
2329
2330         print_canon_ace_list( "file ace - before valid", file_ace);
2331
2332         st = *pst;
2333
2334         /*
2335          * A default 3 element mode entry for a file should be r-- --- ---.
2336          * A default 3 element mode entry for a directory should be rwx --- ---.
2337          */
2338
2339         st.st_ex_mode = create_default_mode(fsp, False);
2340
2341         if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2342                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2343                 free_canon_ace_list(file_ace);
2344                 free_canon_ace_list(dir_ace);
2345                 return False;
2346         }
2347
2348         print_canon_ace_list( "dir ace - before valid", dir_ace);
2349
2350         /*
2351          * A default inheritable 3 element mode entry for a directory should be the
2352          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2353          * it's a directory.
2354          */
2355
2356         st.st_ex_mode = create_default_mode(fsp, True);
2357
2358         if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2359                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2360                 free_canon_ace_list(file_ace);
2361                 free_canon_ace_list(dir_ace);
2362                 return False;
2363         }
2364
2365         print_canon_ace_list( "file ace - return", file_ace);
2366         print_canon_ace_list( "dir ace - return", dir_ace);
2367
2368         *ppfile_ace = file_ace;
2369         *ppdir_ace = dir_ace;
2370         return True;
2371
2372 }
2373
2374 /******************************************************************************
2375  When returning permissions, try and fit NT display
2376  semantics if possible. Note the the canon_entries here must have been malloced.
2377  The list format should be - first entry = owner, followed by group and other user
2378  entries, last entry = other.
2379
2380  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2381  are not ordered, and match on the most specific entry rather than walking a list,
2382  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2383
2384  Entry 0: owner : deny all except read and write.
2385  Entry 1: owner : allow read and write.
2386  Entry 2: group : deny all except read.
2387  Entry 3: group : allow read.
2388  Entry 4: Everyone : allow read.
2389
2390  But NT cannot display this in their ACL editor !
2391 ********************************************************************************/
2392
2393 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2394 {
2395         canon_ace *l_head = *pp_list_head;
2396         canon_ace *owner_ace = NULL;
2397         canon_ace *other_ace = NULL;
2398         canon_ace *ace = NULL;
2399
2400         for (ace = l_head; ace; ace = ace->next) {
2401                 if (ace->type == SMB_ACL_USER_OBJ)
2402                         owner_ace = ace;
2403                 else if (ace->type == SMB_ACL_OTHER) {
2404                         /* Last ace - this is "other" */
2405                         other_ace = ace;
2406                 }
2407         }
2408
2409         if (!owner_ace || !other_ace) {
2410                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2411                         filename ));
2412                 return;
2413         }
2414
2415         /*
2416          * The POSIX algorithm applies to owner first, and other last,
2417          * so ensure they are arranged in this order.
2418          */
2419
2420         if (owner_ace) {
2421                 DLIST_PROMOTE(l_head, owner_ace);
2422         }
2423
2424         if (other_ace) {
2425                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2426         }
2427
2428         /* We have probably changed the head of the list. */
2429
2430         *pp_list_head = l_head;
2431 }
2432
2433 /****************************************************************************
2434  Create a linked list of canonical ACE entries.
2435 ****************************************************************************/
2436
2437 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2438                                    const char *fname, SMB_ACL_T posix_acl,
2439                                    const SMB_STRUCT_STAT *psbuf,
2440                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2441 {
2442         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2443         canon_ace *l_head = NULL;
2444         canon_ace *ace = NULL;
2445         canon_ace *next_ace = NULL;
2446         int entry_id = SMB_ACL_FIRST_ENTRY;
2447         SMB_ACL_ENTRY_T entry;
2448         size_t ace_count;
2449
2450         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2451                 SMB_ACL_TAG_T tagtype;
2452                 SMB_ACL_PERMSET_T permset;
2453                 struct dom_sid sid;
2454                 posix_id unix_ug;
2455                 enum ace_owner owner_type;
2456
2457                 entry_id = SMB_ACL_NEXT_ENTRY;
2458
2459                 /* Is this a MASK entry ? */
2460                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2461                         continue;
2462
2463                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2464                         continue;
2465
2466                 /* Decide which SID to use based on the ACL type. */
2467                 switch(tagtype) {
2468                         case SMB_ACL_USER_OBJ:
2469                                 /* Get the SID from the owner. */
2470                                 sid_copy(&sid, powner);
2471                                 unix_ug.uid = psbuf->st_ex_uid;
2472                                 owner_type = UID_ACE;
2473                                 break;
2474                         case SMB_ACL_USER:
2475                                 {
2476                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2477                                         if (puid == NULL) {
2478                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2479                                                 continue;
2480                                         }
2481                                         uid_to_sid( &sid, *puid);
2482                                         unix_ug.uid = *puid;
2483                                         owner_type = UID_ACE;
2484                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2485                                         break;
2486                                 }
2487                         case SMB_ACL_GROUP_OBJ:
2488                                 /* Get the SID from the owning group. */
2489                                 sid_copy(&sid, pgroup);
2490                                 unix_ug.gid = psbuf->st_ex_gid;
2491                                 owner_type = GID_ACE;
2492                                 break;
2493                         case SMB_ACL_GROUP:
2494                                 {
2495                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2496                                         if (pgid == NULL) {
2497                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2498                                                 continue;
2499                                         }
2500                                         gid_to_sid( &sid, *pgid);
2501                                         unix_ug.gid = *pgid;
2502                                         owner_type = GID_ACE;
2503                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2504                                         break;
2505                                 }
2506                         case SMB_ACL_MASK:
2507                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2508                                 continue; /* Don't count the mask as an entry. */
2509                         case SMB_ACL_OTHER:
2510                                 /* Use the Everyone SID */
2511                                 sid = global_sid_World;
2512                                 unix_ug.world = -1;
2513                                 owner_type = WORLD_ACE;
2514                                 break;
2515                         default:
2516                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2517                                 continue;
2518                 }
2519
2520                 /*
2521                  * Add this entry to the list.
2522                  */
2523
2524                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2525                         goto fail;
2526
2527                 ZERO_STRUCTP(ace);
2528                 ace->type = tagtype;
2529                 ace->perms = convert_permset_to_mode_t(conn, permset);
2530                 ace->attr = ALLOW_ACE;
2531                 ace->trustee = sid;
2532                 ace->unix_ug = unix_ug;
2533                 ace->owner_type = owner_type;
2534                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2535
2536                 DLIST_ADD(l_head, ace);
2537         }
2538
2539         /*
2540          * This next call will ensure we have at least a user/group/world set.
2541          */
2542
2543         if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2544                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2545                                       psbuf, False))
2546                 goto fail;
2547
2548         /*
2549          * Now go through the list, masking the permissions with the
2550          * acl_mask. Ensure all DENY Entries are at the start of the list.
2551          */
2552
2553         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2554
2555         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2556                 next_ace = ace->next;
2557
2558                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2559                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2560                         ace->perms &= acl_mask;
2561
2562                 if (ace->perms == 0) {
2563                         DLIST_PROMOTE(l_head, ace);
2564                 }
2565
2566                 if( DEBUGLVL( 10 ) ) {
2567                         print_canon_ace(ace, ace_count);
2568                 }
2569         }
2570
2571         arrange_posix_perms(fname,&l_head );
2572
2573         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2574
2575         return l_head;
2576
2577   fail:
2578
2579         free_canon_ace_list(l_head);
2580         return NULL;
2581 }
2582
2583 /****************************************************************************
2584  Check if the current user group list contains a given group.
2585 ****************************************************************************/
2586
2587 bool current_user_in_group(connection_struct *conn, gid_t gid)
2588 {
2589         int i;
2590         const struct security_unix_token *utok = get_current_utok(conn);
2591
2592         for (i = 0; i < utok->ngroups; i++) {
2593                 if (utok->groups[i] == gid) {
2594                         return True;
2595                 }
2596         }
2597
2598         return False;
2599 }
2600
2601 /****************************************************************************
2602  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2603 ****************************************************************************/
2604
2605 static bool acl_group_override(connection_struct *conn,
2606                                const struct smb_filename *smb_fname)
2607 {
2608         if ((errno != EPERM) && (errno != EACCES)) {
2609                 return false;
2610         }
2611
2612         /* file primary group == user primary or supplementary group */
2613         if (lp_acl_group_control(SNUM(conn)) &&
2614             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2615                 return true;
2616         }
2617
2618         /* user has writeable permission */
2619         if (lp_dos_filemode(SNUM(conn)) &&
2620             can_write_to_file(conn, smb_fname)) {
2621                 return true;
2622         }
2623
2624         return false;
2625 }
2626
2627 /****************************************************************************
2628  Attempt to apply an ACL to a file or directory.
2629 ****************************************************************************/
2630
2631 static bool set_canon_ace_list(files_struct *fsp,
2632                                 canon_ace *the_ace,
2633                                 bool default_ace,
2634                                 const SMB_STRUCT_STAT *psbuf,
2635                                 bool *pacl_set_support)
2636 {
2637         connection_struct *conn = fsp->conn;
2638         bool ret = False;
2639         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2640         canon_ace *p_ace;
2641         int i;
2642         SMB_ACL_ENTRY_T mask_entry;
2643         bool got_mask_entry = False;
2644         SMB_ACL_PERMSET_T mask_permset;
2645         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2646         bool needs_mask = False;
2647         mode_t mask_perms = 0;
2648
2649         /* Use the psbuf that was passed in. */
2650         if (psbuf != &fsp->fsp_name->st) {
2651                 fsp->fsp_name->st = *psbuf;
2652         }
2653
2654 #if defined(POSIX_ACL_NEEDS_MASK)
2655         /* HP-UX always wants to have a mask (called "class" there). */
2656         needs_mask = True;
2657 #endif
2658
2659         if (the_acl == NULL) {
2660
2661                 if (!no_acl_syscall_error(errno)) {
2662                         /*
2663                          * Only print this error message if we have some kind of ACL
2664                          * support that's not working. Otherwise we would always get this.
2665                          */
2666                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2667                                 default_ace ? "default" : "file", strerror(errno) ));
2668                 }
2669                 *pacl_set_support = False;
2670                 goto fail;
2671         }
2672
2673         if( DEBUGLVL( 10 )) {
2674                 dbgtext("set_canon_ace_list: setting ACL:\n");
2675                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2676                         print_canon_ace( p_ace, i);
2677                 }
2678         }
2679
2680         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2681                 SMB_ACL_ENTRY_T the_entry;
2682                 SMB_ACL_PERMSET_T the_permset;
2683
2684                 /*
2685                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2686                  * named group entries. But if there is an ACL_MASK entry, it applies
2687                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2688                  * so that it doesn't deny (i.e., mask off) any permissions.
2689                  */
2690
2691                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2692                         needs_mask = True;
2693                         mask_perms |= p_ace->perms;
2694                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2695                         mask_perms |= p_ace->perms;
2696                 }
2697
2698                 /*
2699                  * Get the entry for this ACE.
2700                  */
2701
2702                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2703                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2704                                 i, strerror(errno) ));
2705                         goto fail;
2706                 }
2707
2708                 if (p_ace->type == SMB_ACL_MASK) {
2709                         mask_entry = the_entry;
2710                         got_mask_entry = True;
2711                 }
2712
2713                 /*
2714                  * Ok - we now know the ACL calls should be working, don't
2715                  * allow fallback to chmod.
2716                  */
2717
2718                 *pacl_set_support = True;
2719
2720                 /*
2721                  * Initialise the entry from the canon_ace.
2722                  */
2723
2724                 /*
2725                  * First tell the entry what type of ACE this is.
2726                  */
2727
2728                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2729                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2730                                 i, strerror(errno) ));
2731                         goto fail;
2732                 }
2733
2734                 /*
2735                  * Only set the qualifier (user or group id) if the entry is a user
2736                  * or group id ACE.
2737                  */
2738
2739                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2740                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2741                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2742                                         i, strerror(errno) ));
2743                                 goto fail;
2744                         }
2745                 }
2746
2747                 /*
2748                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2749                  */
2750
2751                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2752                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2753                                 i, strerror(errno) ));
2754                         goto fail;
2755                 }
2756
2757                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2758                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2759                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2760                         goto fail;
2761                 }
2762
2763                 /*
2764                  * ..and apply them to the entry.
2765                  */
2766
2767                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2768                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2769                                 i, strerror(errno) ));
2770                         goto fail;
2771                 }
2772
2773                 if( DEBUGLVL( 10 ))
2774                         print_canon_ace( p_ace, i);
2775
2776         }
2777
2778         if (needs_mask && !got_mask_entry) {
2779                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2780                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2781                         goto fail;
2782                 }
2783
2784                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2785                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2786                         goto fail;
2787                 }
2788
2789                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2790                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2791                         goto fail;
2792                 }
2793
2794                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2795                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2796                         goto fail;
2797                 }
2798
2799                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2800                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2801                         goto fail;
2802                 }
2803         }
2804
2805         /*
2806          * Finally apply it to the file or directory.
2807          */
2808
2809         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2810                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2811                                              the_acl_type, the_acl) == -1) {
2812                         /*
2813                          * Some systems allow all the above calls and only fail with no ACL support
2814                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2815                          */
2816                         if (no_acl_syscall_error(errno)) {
2817                                 *pacl_set_support = False;
2818                         }
2819
2820                         if (acl_group_override(conn, fsp->fsp_name)) {
2821                                 int sret;
2822
2823                                 DEBUG(5,("set_canon_ace_list: acl group "
2824                                          "control on and current user in file "
2825                                          "%s primary group.\n",
2826                                          fsp_str_dbg(fsp)));
2827
2828                                 become_root();
2829                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2830                                     fsp->fsp_name->base_name, the_acl_type,
2831                                     the_acl);
2832                                 unbecome_root();
2833                                 if (sret == 0) {
2834                                         ret = True;
2835                                 }
2836                         }
2837
2838                         if (ret == False) {
2839                                 DEBUG(2,("set_canon_ace_list: "
2840                                          "sys_acl_set_file type %s failed for "
2841                                          "file %s (%s).\n",
2842                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2843                                          "directory default" : "file",
2844                                          fsp_str_dbg(fsp), strerror(errno)));
2845                                 goto fail;
2846                         }
2847                 }
2848         } else {
2849                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2850                         /*
2851                          * Some systems allow all the above calls and only fail with no ACL support
2852                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2853                          */
2854                         if (no_acl_syscall_error(errno)) {
2855                                 *pacl_set_support = False;
2856                         }
2857
2858                         if (acl_group_override(conn, fsp->fsp_name)) {
2859                                 int sret;
2860
2861                                 DEBUG(5,("set_canon_ace_list: acl group "
2862                                          "control on and current user in file "
2863                                          "%s primary group.\n",
2864                                          fsp_str_dbg(fsp)));
2865
2866                                 become_root();
2867                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2868                                 unbecome_root();
2869                                 if (sret == 0) {
2870                                         ret = True;
2871                                 }
2872                         }
2873
2874                         if (ret == False) {
2875                                 DEBUG(2,("set_canon_ace_list: "
2876                                          "sys_acl_set_file failed for file %s "
2877                                          "(%s).\n",
2878                                          fsp_str_dbg(fsp), strerror(errno)));
2879                                 goto fail;
2880                         }
2881                 }
2882         }
2883
2884         ret = True;
2885
2886   fail:
2887
2888         if (the_acl != NULL) {
2889                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2890         }
2891
2892         return ret;
2893 }
2894
2895 /****************************************************************************
2896  Find a particular canon_ace entry.
2897 ****************************************************************************/
2898
2899 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2900 {
2901         while (list) {
2902                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2903                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2904                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2905                         break;
2906                 list = list->next;
2907         }
2908         return list;
2909 }
2910
2911 /****************************************************************************
2912
2913 ****************************************************************************/
2914
2915 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2916 {
2917         SMB_ACL_ENTRY_T entry;
2918
2919         if (!the_acl)
2920                 return NULL;
2921         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2922                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2923                 return NULL;
2924         }
2925         return the_acl;
2926 }
2927
2928 /****************************************************************************
2929  Convert a canon_ace to a generic 3 element permission - if possible.
2930 ****************************************************************************/
2931
2932 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2933
2934 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2935 {
2936         int snum = SNUM(fsp->conn);
2937         size_t ace_count = count_canon_ace_list(file_ace_list);
2938         canon_ace *ace_p;
2939         canon_ace *owner_ace = NULL;
2940         canon_ace *group_ace = NULL;
2941         canon_ace *other_ace = NULL;
2942         mode_t and_bits;
2943         mode_t or_bits;
2944
2945         if (ace_count != 3) {
2946                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2947                          "entries for file %s to convert to posix perms.\n",
2948                          fsp_str_dbg(fsp)));
2949                 return False;
2950         }
2951
2952         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2953                 if (ace_p->owner_type == UID_ACE)
2954                         owner_ace = ace_p;
2955                 else if (ace_p->owner_type == GID_ACE)
2956                         group_ace = ace_p;
2957                 else if (ace_p->owner_type == WORLD_ACE)
2958                         other_ace = ace_p;
2959         }
2960
2961         if (!owner_ace || !group_ace || !other_ace) {
2962                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
2963                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
2964                 return False;
2965         }
2966
2967         *posix_perms = (mode_t)0;
2968
2969         *posix_perms |= owner_ace->perms;
2970         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2971         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2972         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2973         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2974         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2975         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2976
2977         /* The owner must have at least read access. */
2978
2979         *posix_perms |= S_IRUSR;
2980         if (fsp->is_directory)
2981                 *posix_perms |= (S_IWUSR|S_IXUSR);
2982
2983         /* If requested apply the masks. */
2984
2985         /* Get the initial bits to apply. */
2986
2987         if (fsp->is_directory) {
2988                 and_bits = lp_dir_security_mask(snum);
2989                 or_bits = lp_force_dir_security_mode(snum);
2990         } else {
2991                 and_bits = lp_security_mask(snum);
2992                 or_bits = lp_force_security_mode(snum);
2993         }
2994
2995         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2996
2997         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
2998                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
2999                   (int)group_ace->perms, (int)other_ace->perms,
3000                   (int)*posix_perms, fsp_str_dbg(fsp)));
3001
3002         return True;
3003 }
3004
3005 /****************************************************************************
3006   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3007   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3008   with CI|OI set so it is inherited and also applies to the directory.
3009   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3010 ****************************************************************************/
3011
3012 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3013 {
3014         size_t i, j;
3015
3016         for (i = 0; i < num_aces; i++) {
3017                 for (j = i+1; j < num_aces; j++) {
3018                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3019                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3020                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3021                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3022
3023                         /* We know the lower number ACE's are file entries. */
3024                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3025                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3026                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3027                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3028                                 (i_inh == j_inh) &&
3029                                 (i_flags_ni == 0) &&
3030                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3031                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3032                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3033                                 /*
3034                                  * W2K wants to have access allowed zero access ACE's
3035                                  * at the end of the list. If the mask is zero, merge
3036                                  * the non-inherited ACE onto the inherited ACE.
3037                                  */
3038
3039                                 if (nt_ace_list[i].access_mask == 0) {
3040                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3041                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3042                                         if (num_aces - i - 1 > 0)
3043                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3044                                                                 sizeof(struct security_ace));
3045
3046                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3047                                                 (unsigned int)i, (unsigned int)j ));
3048                                 } else {
3049                                         /*
3050                                          * These are identical except for the flags.
3051                                          * Merge the inherited ACE onto the non-inherited ACE.
3052                                          */
3053
3054                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3055                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3056                                         if (num_aces - j - 1 > 0)
3057                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3058                                                                 sizeof(struct security_ace));
3059
3060                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3061                                                 (unsigned int)j, (unsigned int)i ));
3062                                 }
3063                                 num_aces--;
3064                                 break;
3065                         }
3066                 }
3067         }
3068
3069         return num_aces;
3070 }
3071
3072 /*
3073  * Add or Replace ACE entry.
3074  * In some cases we need to add a specific ACE for compatibility reasons.
3075  * When doing that we must make sure we are not actually creating a duplicate
3076  * entry. So we need to search whether an ACE entry already exist and eventually
3077  * replacce the access mask, or add a completely new entry if none was found.
3078  *
3079  * This function assumes the array has enough space to add a new entry without
3080  * any reallocation of memory.
3081  */
3082
3083 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3084                                 const struct dom_sid *sid, enum security_ace_type type,
3085                                 uint32_t mask, uint8_t flags)
3086 {
3087         int i;
3088
3089         /* first search for a duplicate */
3090         for (i = 0; i < *num_aces; i++) {
3091                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3092                     (nt_ace_list[i].flags == flags)) break;
3093         }
3094
3095         if (i < *num_aces) { /* found */
3096                 nt_ace_list[i].type = type;
3097                 nt_ace_list[i].access_mask = mask;
3098                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3099                            i, sid_string_dbg(sid), flags));
3100                 return;
3101         }
3102
3103         /* not found, append it */
3104         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3105 }
3106
3107
3108 /****************************************************************************
3109  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3110  the space for the return elements and returns the size needed to return the
3111  security descriptor. This should be the only external function needed for
3112  the UNIX style get ACL.
3113 ****************************************************************************/
3114
3115 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3116                                       const char *name,
3117                                       const SMB_STRUCT_STAT *sbuf,
3118                                       struct pai_val *pal,
3119                                       SMB_ACL_T posix_acl,
3120                                       SMB_ACL_T def_acl,
3121                                       uint32_t security_info,
3122                                       struct security_descriptor **ppdesc)
3123 {
3124         struct dom_sid owner_sid;
3125         struct dom_sid group_sid;
3126         size_t sd_size = 0;
3127         struct security_acl *psa = NULL;
3128         size_t num_acls = 0;
3129         size_t num_def_acls = 0;
3130         size_t num_aces = 0;
3131         canon_ace *file_ace = NULL;
3132         canon_ace *dir_ace = NULL;
3133         struct security_ace *nt_ace_list = NULL;
3134         size_t num_profile_acls = 0;
3135         struct dom_sid orig_owner_sid;
3136         struct security_descriptor *psd = NULL;
3137         int i;
3138
3139         /*
3140          * Get the owner, group and world SIDs.
3141          */
3142
3143         create_file_sids(sbuf, &owner_sid, &group_sid);
3144
3145         if (lp_profile_acls(SNUM(conn))) {
3146                 /* For WXP SP1 the owner must be administrators. */
3147                 sid_copy(&orig_owner_sid, &owner_sid);
3148                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3149                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3150                 num_profile_acls = 3;
3151         }
3152
3153         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3154
3155                 /*
3156                  * In the optimum case Creator Owner and Creator Group would be used for
3157                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3158                  * would lead to usability problems under Windows: The Creator entries
3159                  * are only available in browse lists of directories and not for files;
3160                  * additionally the identity of the owning group couldn't be determined.
3161                  * We therefore use those identities only for Default ACLs.
3162                  */
3163
3164                 /* Create the canon_ace lists. */
3165                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3166                                             &owner_sid, &group_sid, pal,
3167                                             SMB_ACL_TYPE_ACCESS);
3168
3169                 /* We must have *some* ACLS. */
3170
3171                 if (count_canon_ace_list(file_ace) == 0) {
3172                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3173                         goto done;
3174                 }
3175
3176                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3177                         dir_ace = canonicalise_acl(conn, name, def_acl,
3178                                                    sbuf,
3179                                                    &global_sid_Creator_Owner,
3180                                                    &global_sid_Creator_Group,
3181                                                    pal, SMB_ACL_TYPE_DEFAULT);
3182                 }
3183
3184                 /*
3185                  * Create the NT ACE list from the canonical ace lists.
3186                  */
3187
3188                 {
3189                         canon_ace *ace;
3190                         enum security_ace_type nt_acl_type;
3191
3192                         if (nt4_compatible_acls() && dir_ace) {
3193                                 /*
3194                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3195                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3196                                  * remove entries from the Access ACL if the
3197                                  * corresponding Default ACL entries have also been
3198                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3199                                  * are exceptions. We can do nothing
3200                                  * intelligent if the Default ACL contains entries that
3201                                  * are not also contained in the Access ACL, so this
3202                                  * case will still fail under NT 4.
3203                                  */
3204
3205                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3206                                 if (ace && !ace->perms) {
3207                                         DLIST_REMOVE(dir_ace, ace);
3208                                         SAFE_FREE(ace);
3209
3210                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3211                                         if (ace && !ace->perms) {
3212                                                 DLIST_REMOVE(file_ace, ace);
3213                                                 SAFE_FREE(ace);
3214                                         }
3215                                 }
3216
3217                                 /*
3218                                  * WinNT doesn't usually have Creator Group
3219                                  * in browse lists, so we send this entry to
3220                                  * WinNT even if it contains no relevant
3221                                  * permissions. Once we can add
3222                                  * Creator Group to browse lists we can
3223                                  * re-enable this.
3224                                  */
3225
3226 #if 0
3227                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3228                                 if (ace && !ace->perms) {
3229                                         DLIST_REMOVE(dir_ace, ace);
3230                                         SAFE_FREE(ace);
3231                                 }
3232 #endif
3233
3234                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3235                                 if (ace && !ace->perms) {
3236                                         DLIST_REMOVE(file_ace, ace);
3237                                         SAFE_FREE(ace);
3238                                 }
3239                         }
3240
3241                         num_acls = count_canon_ace_list(file_ace);
3242                         num_def_acls = count_canon_ace_list(dir_ace);
3243
3244                         /* Allocate the ace list. */
3245                         if ((nt_ace_list = SMB_MALLOC_ARRAY(struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3246                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3247                                 goto done;
3248                         }
3249
3250                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3251
3252                         /*
3253                          * Create the NT ACE list from the canonical ace lists.
3254                          */
3255
3256                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3257                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3258                                                 &nt_acl_type,
3259                                                 ace->perms,
3260                                                 S_ISDIR(sbuf->st_ex_mode));
3261                                 init_sec_ace(&nt_ace_list[num_aces++],
3262                                         &ace->trustee,
3263                                         nt_acl_type,
3264                                         acc,
3265                                         ace->ace_flags);
3266                         }
3267
3268                         /* The User must have access to a profile share - even
3269                          * if we can't map the SID. */
3270                         if (lp_profile_acls(SNUM(conn))) {
3271                                 add_or_replace_ace(nt_ace_list, &num_aces,
3272                                                    &global_sid_Builtin_Users,
3273                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3274                                                    FILE_GENERIC_ALL, 0);
3275                         }
3276
3277                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3278                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3279                                                 &nt_acl_type,
3280                                                 ace->perms,
3281                                                 S_ISDIR(sbuf->st_ex_mode));
3282                                 init_sec_ace(&nt_ace_list[num_aces++],
3283                                         &ace->trustee,
3284                                         nt_acl_type,
3285                                         acc,
3286                                         ace->ace_flags |
3287                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3288                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3289                                         SEC_ACE_FLAG_INHERIT_ONLY);
3290                         }
3291
3292                         /* The User must have access to a profile share - even
3293                          * if we can't map the SID. */
3294                         if (lp_profile_acls(SNUM(conn))) {
3295                                 add_or_replace_ace(nt_ace_list, &num_aces,
3296                                                 &global_sid_Builtin_Users,
3297                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3298                                                 FILE_GENERIC_ALL,
3299                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3300                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3301                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3302                         }
3303
3304                         /*
3305                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3306                          * Win2K needs this to get the inheritance correct when replacing ACLs
3307                          * on a directory tree. Based on work by Jim @ IBM.
3308                          */
3309
3310                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3311
3312                         if (lp_profile_acls(SNUM(conn))) {
3313                                 for (i = 0; i < num_aces; i++) {
3314                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3315                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3316                                                                    &orig_owner_sid,
3317                                                                    nt_ace_list[i].type,
3318                                                                    nt_ace_list[i].access_mask,
3319                                                                    nt_ace_list[i].flags);
3320                                                 break;
3321                                         }
3322                                 }
3323                         }
3324                 }
3325
3326                 if (num_aces) {
3327                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3328                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3329                                 goto done;
3330                         }
3331                 }
3332         } /* security_info & SECINFO_DACL */
3333
3334         psd = make_standard_sec_desc( talloc_tos(),
3335                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3336                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3337                         psa,
3338                         &sd_size);
3339
3340         if(!psd) {
3341                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3342                 sd_size = 0;
3343                 goto done;
3344         }
3345
3346         /*
3347          * Windows 2000: The DACL_PROTECTED flag in the security
3348          * descriptor marks the ACL as non-inheriting, i.e., no
3349          * ACEs from higher level directories propagate to this
3350          * ACL. In the POSIX ACL model permissions are only
3351          * inherited at file create time, so ACLs never contain
3352          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3353          * flag doesn't seem to bother Windows NT.
3354          * Always set this if map acl inherit is turned off.
3355          */
3356         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3357                 psd->type |= SEC_DESC_DACL_PROTECTED;
3358         } else {
3359                 psd->type |= pal->sd_type;
3360         }
3361
3362         if (psd->dacl) {
3363                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3364         }
3365
3366         *ppdesc = psd;
3367
3368  done:
3369
3370         if (posix_acl) {
3371                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3372         }
3373         if (def_acl) {
3374                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3375         }
3376         free_canon_ace_list(file_ace);
3377         free_canon_ace_list(dir_ace);
3378         free_inherited_info(pal);
3379         SAFE_FREE(nt_ace_list);
3380
3381         return NT_STATUS_OK;
3382 }
3383
3384 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3385                            struct security_descriptor **ppdesc)
3386 {
3387         SMB_STRUCT_STAT sbuf;
3388         SMB_ACL_T posix_acl = NULL;
3389         struct pai_val *pal;
3390
3391         *ppdesc = NULL;
3392
3393         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3394                   fsp_str_dbg(fsp)));
3395
3396         /* can it happen that fsp_name == NULL ? */
3397         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3398                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3399                                         security_info, ppdesc);
3400         }
3401
3402         /* Get the stat struct for the owner info. */
3403         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3404                 return map_nt_error_from_unix(errno);
3405         }
3406
3407         /* Get the ACL from the fd. */
3408         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3409
3410         pal = fload_inherited_info(fsp);
3411
3412         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3413                                        &sbuf, pal, posix_acl, NULL,
3414                                        security_info, ppdesc);
3415 }
3416
3417 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3418                           uint32_t security_info, struct security_descriptor **ppdesc)
3419 {
3420         SMB_ACL_T posix_acl = NULL;
3421         SMB_ACL_T def_acl = NULL;
3422         struct pai_val *pal;
3423         struct smb_filename smb_fname;
3424         int ret;
3425
3426         *ppdesc = NULL;
3427
3428         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3429
3430         ZERO_STRUCT(smb_fname);
3431         smb_fname.base_name = discard_const_p(char, name);
3432
3433         /* Get the stat struct for the owner info. */
3434         if (lp_posix_pathnames()) {
3435                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3436         } else {
3437                 ret = SMB_VFS_STAT(conn, &smb_fname);
3438         }
3439
3440         if (ret == -1) {
3441                 return map_nt_error_from_unix(errno);
3442         }
3443
3444         /* Get the ACL from the path. */
3445         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3446
3447         /* If it's a directory get the default POSIX ACL. */
3448         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3449                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3450                 def_acl = free_empty_sys_acl(conn, def_acl);
3451         }
3452
3453         pal = load_inherited_info(conn, name);
3454
3455         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3456                                        posix_acl, def_acl, security_info,
3457                                        ppdesc);
3458 }
3459
3460 /****************************************************************************
3461  Try to chown a file. We will be able to chown it under the following conditions.
3462
3463   1) If we have root privileges, then it will just work.
3464   2) If we have SeRestorePrivilege we can change the user + group to any other user.
3465   3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3466   4) If we have write permission to the file and dos_filemodes is set
3467      then allow chown to the currently authenticated user.
3468 ****************************************************************************/
3469
3470 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3471 {
3472         NTSTATUS status;
3473
3474         if(!CAN_WRITE(fsp->conn)) {
3475                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3476         }
3477
3478         /* Case (1). */
3479         status = vfs_chown_fsp(fsp, uid, gid);
3480         if (NT_STATUS_IS_OK(status)) {
3481                 return status;
3482         }
3483
3484         /* Case (2) / (3) */
3485         if (lp_enable_privileges()) {
3486                 bool has_take_ownership_priv = security_token_has_privilege(
3487                                                 get_current_nttok(fsp->conn),
3488                                                 SEC_PRIV_TAKE_OWNERSHIP);
3489                 bool has_restore_priv = security_token_has_privilege(
3490                                                 get_current_nttok(fsp->conn),
3491                                                 SEC_PRIV_RESTORE);
3492
3493                 if (has_restore_priv) {
3494                         ; /* Case (2) */
3495                 } else if (has_take_ownership_priv) {
3496                         /* Case (3) */
3497                         if (uid == get_current_uid(fsp->conn)) {
3498                                 gid = (gid_t)-1;
3499                         } else {
3500                                 has_take_ownership_priv = false;
3501                         }
3502                 }
3503
3504                 if (has_take_ownership_priv || has_restore_priv) {
3505                         become_root();
3506                         status = vfs_chown_fsp(fsp, uid, gid);
3507                         unbecome_root();
3508                         return status;
3509                 }
3510         }
3511
3512         /* Case (4). */
3513         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3514                 return NT_STATUS_ACCESS_DENIED;
3515         }
3516
3517         /* only allow chown to the current user. This is more secure,
3518            and also copes with the case where the SID in a take ownership ACL is
3519            a local SID on the users workstation
3520         */
3521         if (uid != get_current_uid(fsp->conn)) {
3522                 return NT_STATUS_ACCESS_DENIED;
3523         }
3524
3525         become_root();
3526         /* Keep the current file gid the same. */
3527         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3528         unbecome_root();
3529
3530         return status;
3531 }
3532
3533 #if 0
3534 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3535
3536 /****************************************************************************
3537  Take care of parent ACL inheritance.
3538 ****************************************************************************/
3539
3540 NTSTATUS append_parent_acl(files_struct *fsp,
3541                                 const struct security_descriptor *pcsd,
3542                                 struct security_descriptor **pp_new_sd)
3543 {
3544         struct smb_filename *smb_dname = NULL;
3545         struct security_descriptor *parent_sd = NULL;
3546         files_struct *parent_fsp = NULL;
3547         TALLOC_CTX *mem_ctx = talloc_tos();
3548         char *parent_name = NULL;
3549         struct security_ace *new_ace = NULL;
3550         unsigned int num_aces = pcsd->dacl->num_aces;
3551         NTSTATUS status;
3552         int info;
3553         unsigned int i, j;
3554         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3555         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3556
3557         if (psd == NULL) {
3558                 return NT_STATUS_NO_MEMORY;
3559         }
3560
3561         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3562                             NULL)) {
3563                 return NT_STATUS_NO_MEMORY;
3564         }
3565
3566         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3567                                             &smb_dname);
3568         if (!NT_STATUS_IS_OK(status)) {
3569                 goto fail;
3570         }
3571
3572         status = SMB_VFS_CREATE_FILE(
3573                 fsp->conn,                              /* conn */
3574                 NULL,                                   /* req */
3575                 0,                                      /* root_dir_fid */
3576                 smb_dname,                              /* fname */
3577                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3578                 FILE_SHARE_NONE,                        /* share_access */
3579                 FILE_OPEN,                              /* create_disposition*/
3580                 FILE_DIRECTORY_FILE,                    /* create_options */
3581                 0,                                      /* file_attributes */
3582                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3583                 0,                                      /* allocation_size */
3584                 NULL,                                   /* sd */
3585                 NULL,                                   /* ea_list */
3586                 &parent_fsp,                            /* result */
3587                 &info);                                 /* pinfo */
3588
3589         if (!NT_STATUS_IS_OK(status)) {
3590                 TALLOC_FREE(smb_dname);
3591                 return status;
3592         }
3593
3594         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3595                                     SECINFO_DACL, &parent_sd );
3596
3597         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3598         TALLOC_FREE(smb_dname);
3599
3600         if (!NT_STATUS_IS_OK(status)) {
3601                 return status;
3602         }
3603
3604         /*
3605          * Make room for potentially all the ACLs from
3606          * the parent. We used to add the ugw triple here,
3607          * as we knew we were dealing with POSIX ACLs.
3608          * We no longer need to do so as we can guarentee
3609          * that a default ACL from the parent directory will
3610          * be well formed for POSIX ACLs if it came from a
3611          * POSIX ACL source, and if we're not writing to a
3612          * POSIX ACL sink then we don't care if it's not well
3613          * formed. JRA.
3614          */
3615
3616         num_aces += parent_sd->dacl->num_aces;
3617
3618         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, struct security_ace,
3619                                         num_aces)) == NULL) {
3620                 return NT_STATUS_NO_MEMORY;
3621         }
3622
3623         /* Start by copying in all the given ACE entries. */
3624         for (i = 0; i < psd->dacl->num_aces; i++) {
3625                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3626         }
3627
3628         /*
3629          * Note that we're ignoring "inherit permissions" here
3630          * as that really only applies to newly created files. JRA.
3631          */
3632
3633         /* Finally append any inherited ACEs. */
3634         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3635                 struct security_ace *se = &parent_sd->dacl->aces[j];
3636
3637                 if (fsp->is_directory) {
3638                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3639                                 /* Doesn't apply to a directory - ignore. */
3640                                 DEBUG(10,("append_parent_acl: directory %s "
3641                                         "ignoring non container "
3642                                         "inherit flags %u on ACE with sid %s "
3643                                         "from parent %s\n",
3644                                         fsp_str_dbg(fsp),
3645                                         (unsigned int)se->flags,
3646                                         sid_string_dbg(&se->trustee),
3647                                         parent_name));
3648                                 continue;
3649                         }
3650                 } else {
3651                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3652                                 /* Doesn't apply to a file - ignore. */
3653                                 DEBUG(10,("append_parent_acl: file %s "
3654                                         "ignoring non object "
3655                                         "inherit flags %u on ACE with sid %s "
3656                                         "from parent %s\n",
3657                                         fsp_str_dbg(fsp),
3658                                         (unsigned int)se->flags,
3659                                         sid_string_dbg(&se->trustee),
3660                                         parent_name));
3661                                 continue;
3662                         }
3663                 }
3664
3665                 if (is_dacl_protected) {
3666                         /* If the DACL is protected it means we must
3667                          * not overwrite an existing ACE entry with the
3668                          * same SID. This is order N^2. Ouch :-(. JRA. */
3669                         unsigned int k;
3670                         for (k = 0; k < psd->dacl->num_aces; k++) {
3671                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3672                                                 &se->trustee)) {
3673                                         break;
3674                                 }
3675                         }
3676                         if (k < psd->dacl->num_aces) {
3677                                 /* SID matched. Ignore. */
3678                                 DEBUG(10,("append_parent_acl: path %s "
3679                                         "ignoring ACE with protected sid %s "
3680                                         "from parent %s\n",
3681                                         fsp_str_dbg(fsp),
3682                                         sid_string_dbg(&se->trustee),
3683                                         parent_name));
3684                                 continue;
3685                         }
3686                 }
3687
3688                 sec_ace_copy(&new_ace[i], se);
3689                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3690                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3691                 }
3692                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3693
3694                 if (fsp->is_directory) {
3695                         /*
3696                          * Strip off any inherit only. It's applied.
3697                          */
3698                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3699                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3700                                 /* No further inheritance. */
3701                                 new_ace[i].flags &=
3702                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3703                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3704                         }
3705                 } else {
3706                         /*
3707                          * Strip off any container or inherit
3708                          * flags, they can't apply to objects.
3709                          */
3710                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3711                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3712                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3713                 }
3714                 i++;
3715
3716                 DEBUG(10,("append_parent_acl: path %s "
3717                         "inheriting ACE with sid %s "
3718                         "from parent %s\n",
3719                         fsp_str_dbg(fsp),
3720                         sid_string_dbg(&se->trustee),
3721                         parent_name));
3722         }
3723
3724         psd->dacl->aces = new_ace;
3725         psd->dacl->num_aces = i;
3726         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3727                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
3728
3729         *pp_new_sd = psd;
3730         return status;
3731 }
3732 #endif
3733
3734 /****************************************************************************
3735  Reply to set a security descriptor on an fsp. security_info_sent is the
3736  description of the following NT ACL.
3737  This should be the only external function needed for the UNIX style set ACL.
3738  We make a copy of psd_orig as internal functions modify the elements inside
3739  it, even though it's a const pointer.
3740 ****************************************************************************/
3741
3742 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3743 {
3744         connection_struct *conn = fsp->conn;
3745         uid_t user = (uid_t)-1;
3746         gid_t grp = (gid_t)-1;
3747         struct dom_sid file_owner_sid;
3748         struct dom_sid file_grp_sid;
3749         canon_ace *file_ace_list = NULL;
3750         canon_ace *dir_ace_list = NULL;
3751         bool acl_perms = False;
3752         mode_t orig_mode = (mode_t)0;
3753         NTSTATUS status;
3754         bool set_acl_as_root = false;
3755         bool acl_set_support = false;
3756         bool ret = false;
3757         struct security_descriptor *psd = NULL;
3758
3759         DEBUG(10,("set_nt_acl: called for file %s\n",
3760                   fsp_str_dbg(fsp)));
3761
3762         if (!CAN_WRITE(conn)) {
3763                 DEBUG(10,("set acl rejected on read-only share\n"));
3764                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3765         }
3766
3767         if (!psd_orig) {
3768                 return NT_STATUS_INVALID_PARAMETER;
3769         }
3770
3771         psd = dup_sec_desc(talloc_tos(), psd_orig);
3772         if (!psd) {
3773                 return NT_STATUS_NO_MEMORY;
3774         }
3775
3776         /*
3777          * Get the current state of the file.
3778          */
3779
3780         status = vfs_stat_fsp(fsp);
3781         if (!NT_STATUS_IS_OK(status)) {
3782                 return status;
3783         }
3784
3785         /* Save the original element we check against. */
3786         orig_mode = fsp->fsp_name->st.st_ex_mode;
3787
3788         /*
3789          * Unpack the user/group/world id's.
3790          */
3791
3792         /* POSIX can't cope with missing owner/group. */
3793         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3794                 security_info_sent &= ~SECINFO_OWNER;
3795         }
3796         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3797                 security_info_sent &= ~SECINFO_GROUP;
3798         }
3799
3800         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3801         if (!NT_STATUS_IS_OK(status)) {
3802                 return status;
3803         }
3804
3805         /*
3806          * Do we need to chown ? If so this must be done first as the incoming
3807          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3808          * Noticed by Simo.
3809          */
3810
3811         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3812             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3813
3814                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3815                          fsp_str_dbg(fsp), (unsigned int)user,
3816                          (unsigned int)grp));
3817
3818                 status = try_chown(fsp, user, grp);
3819                 if(!NT_STATUS_IS_OK(status)) {
3820                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3821                                 "= %s.\n", fsp_str_dbg(fsp),
3822                                 (unsigned int)user,
3823                                 (unsigned int)grp,
3824                                 nt_errstr(status)));
3825                         return status;
3826                 }
3827
3828                 /*
3829                  * Recheck the current state of the file, which may have changed.
3830                  * (suid/sgid bits, for instance)
3831                  */
3832
3833                 status = vfs_stat_fsp(fsp);
3834                 if (!NT_STATUS_IS_OK(status)) {
3835                         return status;
3836                 }
3837
3838                 /* Save the original element we check against. */
3839                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3840
3841                 /* If we successfully chowned, we know we must
3842                  * be able to set the acl, so do it as root.
3843                  */
3844                 set_acl_as_root = true;
3845         }
3846
3847         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3848
3849         if((security_info_sent & SECINFO_DACL) &&
3850                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3851                         (psd->dacl == NULL)) {
3852                 struct security_ace ace[3];
3853
3854                 /* We can't have NULL DACL in POSIX.
3855                    Use owner/group/Everyone -> full access. */
3856
3857                 init_sec_ace(&ace[0],
3858                                 &file_owner_sid,
3859                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3860                                 GENERIC_ALL_ACCESS,
3861                                 0);
3862                 init_sec_ace(&ace[1],
3863                                 &file_grp_sid,
3864                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3865                                 GENERIC_ALL_ACCESS,
3866                                 0);
3867                 init_sec_ace(&ace[2],
3868                                 &global_sid_World,
3869                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3870                                 GENERIC_ALL_ACCESS,
3871                                 0);
3872                 psd->dacl = make_sec_acl(talloc_tos(),
3873                                         NT4_ACL_REVISION,
3874                                         3,
3875                                         ace);
3876                 if (psd->dacl == NULL) {
3877                         return NT_STATUS_NO_MEMORY;
3878                 }
3879                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3880         }
3881
3882         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3883                                      &file_grp_sid, &file_ace_list,
3884                                      &dir_ace_list, security_info_sent, psd);
3885
3886         /* Ignore W2K traverse DACL set. */
3887         if (!file_ace_list && !dir_ace_list) {
3888                 return NT_STATUS_OK;
3889         }
3890
3891         if (!acl_perms) {
3892                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3893                 free_canon_ace_list(file_ace_list);
3894                 free_canon_ace_list(dir_ace_list);
3895                 return NT_STATUS_ACCESS_DENIED;
3896         }
3897
3898         /*
3899          * Only change security if we got a DACL.
3900          */
3901
3902         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3903                 free_canon_ace_list(file_ace_list);
3904                 free_canon_ace_list(dir_ace_list);
3905                 return NT_STATUS_OK;
3906         }
3907
3908         /*
3909          * Try using the POSIX ACL set first. Fall back to chmod if
3910          * we have no ACL support on this filesystem.
3911          */
3912
3913         if (acl_perms && file_ace_list) {
3914                 if (set_acl_as_root) {
3915                         become_root();
3916                 }
3917                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3918                                          &fsp->fsp_name->st, &acl_set_support);
3919                 if (set_acl_as_root) {
3920                         unbecome_root();
3921                 }
3922                 if (acl_set_support && ret == false) {
3923                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3924                                  "%s (%s).\n", fsp_str_dbg(fsp),
3925                                  strerror(errno)));
3926                         free_canon_ace_list(file_ace_list);
3927                         free_canon_ace_list(dir_ace_list);
3928                         return map_nt_error_from_unix(errno);
3929                 }
3930         }
3931
3932         if (acl_perms && acl_set_support && fsp->is_directory) {
3933                 if (dir_ace_list) {
3934                         if (set_acl_as_root) {
3935                                 become_root();
3936                         }
3937                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
3938                                                  &fsp->fsp_name->st,
3939                                                  &acl_set_support);
3940                         if (set_acl_as_root) {
3941                                 unbecome_root();
3942                         }
3943                         if (ret == false) {
3944                                 DEBUG(3,("set_nt_acl: failed to set default "
3945                                          "acl on directory %s (%s).\n",
3946                                          fsp_str_dbg(fsp), strerror(errno)));
3947                                 free_canon_ace_list(file_ace_list);
3948                                 free_canon_ace_list(dir_ace_list);
3949                                 return map_nt_error_from_unix(errno);
3950                         }
3951                 } else {
3952                         int sret = -1;
3953
3954                         /*
3955                          * No default ACL - delete one if it exists.
3956                          */
3957
3958                         if (set_acl_as_root) {
3959                                 become_root();
3960                         }
3961                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3962                             fsp->fsp_name->base_name);
3963                         if (set_acl_as_root) {
3964                                 unbecome_root();
3965                         }
3966                         if (sret == -1) {
3967                                 if (acl_group_override(conn, fsp->fsp_name)) {
3968                                         DEBUG(5,("set_nt_acl: acl group "
3969                                                  "control on and current user "
3970                                                  "in file %s primary group. "
3971                                                  "Override delete_def_acl\n",
3972                                                  fsp_str_dbg(fsp)));
3973
3974                                         become_root();
3975                                         sret =
3976                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3977                                                     conn,
3978                                                     fsp->fsp_name->base_name);
3979                                         unbecome_root();
3980                                 }
3981
3982                                 if (sret == -1) {
3983                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3984                                         free_canon_ace_list(file_ace_list);
3985                                         free_canon_ace_list(dir_ace_list);
3986                                         return map_nt_error_from_unix(errno);
3987                                 }
3988                         }
3989                 }
3990         }
3991
3992         if (acl_set_support) {
3993                 if (set_acl_as_root) {
3994                         become_root();
3995                 }
3996                 store_inheritance_attributes(fsp,
3997                                 file_ace_list,
3998                                 dir_ace_list,
3999                                 psd->type);
4000                 if (set_acl_as_root) {
4001                         unbecome_root();
4002                 }
4003         }
4004
4005         /*
4006          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4007          */
4008
4009         if(!acl_set_support && acl_perms) {
4010                 mode_t posix_perms;
4011
4012                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4013                         free_canon_ace_list(file_ace_list);
4014                         free_canon_ace_list(dir_ace_list);
4015                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4016                                  "posix permissions for file %s.\n",
4017                                  fsp_str_dbg(fsp)));
4018                         return NT_STATUS_ACCESS_DENIED;
4019                 }
4020
4021                 if (orig_mode != posix_perms) {
4022                         int sret = -1;
4023
4024                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4025                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4026
4027                         if (set_acl_as_root) {
4028                                 become_root();
4029                         }
4030                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4031                                              posix_perms);
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 chmod\n",
4041                                                  fsp_str_dbg(fsp)));
4042
4043                                         become_root();
4044                                         sret = SMB_VFS_CHMOD(conn,
4045                                             fsp->fsp_name->base_name,
4046                                             posix_perms);
4047                                         unbecome_root();
4048                                 }
4049
4050                                 if (sret == -1) {
4051                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4052                                                  "failed. Error = %s.\n",
4053                                                  fsp_str_dbg(fsp),
4054                                                  (unsigned int)posix_perms,
4055                                                  strerror(errno)));
4056                                         free_canon_ace_list(file_ace_list);
4057                                         free_canon_ace_list(dir_ace_list);
4058                                         return map_nt_error_from_unix(errno);
4059                                 }
4060                         }
4061                 }
4062         }
4063
4064         free_canon_ace_list(file_ace_list);
4065         free_canon_ace_list(dir_ace_list);
4066
4067         /* Ensure the stat struct in the fsp is correct. */
4068         status = vfs_stat_fsp(fsp);
4069
4070         return NT_STATUS_OK;
4071 }
4072
4073 /****************************************************************************
4074  Get the actual group bits stored on a file with an ACL. Has no effect if
4075  the file has no ACL. Needed in dosmode code where the stat() will return
4076  the mask bits, not the real group bits, for a file with an ACL.
4077 ****************************************************************************/
4078
4079 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4080 {
4081         int entry_id = SMB_ACL_FIRST_ENTRY;
4082         SMB_ACL_ENTRY_T entry;
4083         SMB_ACL_T posix_acl;
4084         int result = -1;
4085
4086         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4087         if (posix_acl == (SMB_ACL_T)NULL)
4088                 return -1;
4089
4090         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4091                 SMB_ACL_TAG_T tagtype;
4092                 SMB_ACL_PERMSET_T permset;
4093
4094                 entry_id = SMB_ACL_NEXT_ENTRY;
4095
4096                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4097                         break;
4098
4099                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4100                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4101                                 break;
4102                         } else {
4103                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4104                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4105                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4106                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4107                                 result = 0;
4108                                 break;
4109                         }
4110                 }
4111         }
4112         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4113         return result;
4114 }
4115
4116 /****************************************************************************
4117  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4118  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4119 ****************************************************************************/
4120
4121 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4122 {
4123         int entry_id = SMB_ACL_FIRST_ENTRY;
4124         SMB_ACL_ENTRY_T entry;
4125         int num_entries = 0;
4126
4127         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4128                 SMB_ACL_TAG_T tagtype;
4129                 SMB_ACL_PERMSET_T permset;
4130                 mode_t perms;
4131
4132                 entry_id = SMB_ACL_NEXT_ENTRY;
4133
4134                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4135                         return -1;
4136
4137                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4138                         return -1;
4139
4140                 num_entries++;
4141
4142                 switch(tagtype) {
4143                         case SMB_ACL_USER_OBJ:
4144                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4145                                 break;
4146                         case SMB_ACL_GROUP_OBJ:
4147                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4148                                 break;
4149                         case SMB_ACL_MASK:
4150                                 /*
4151                                  * FIXME: The ACL_MASK entry permissions should really be set to
4152                                  * the union of the permissions of all ACL_USER,
4153                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4154                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4155                                  */
4156                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4157                                 break;
4158                         case SMB_ACL_OTHER:
4159                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4160                                 break;
4161                         default:
4162                                 continue;
4163                 }
4164
4165                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4166                         return -1;
4167
4168                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4169                         return -1;
4170         }
4171
4172         /*
4173          * If this is a simple 3 element ACL or no elements then it's a standard
4174          * UNIX permission set. Just use chmod...
4175          */
4176
4177         if ((num_entries == 3) || (num_entries == 0))
4178                 return -1;
4179
4180         return 0;
4181 }
4182
4183 /****************************************************************************
4184  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4185  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4186  resulting ACL on TO.  Note that name is in UNIX character set.
4187 ****************************************************************************/
4188
4189 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4190 {
4191         SMB_ACL_T posix_acl = NULL;
4192         int ret = -1;
4193
4194         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4195                 return -1;
4196
4197         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4198                 goto done;
4199
4200         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4201
4202  done:
4203
4204         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4205         return ret;
4206 }
4207
4208 /****************************************************************************
4209  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4210  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4211  Note that name is in UNIX character set.
4212 ****************************************************************************/
4213
4214 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4215 {
4216         return copy_access_posix_acl(conn, name, name, mode);
4217 }
4218
4219 /****************************************************************************
4220  Check for an existing default POSIX ACL on a directory.
4221 ****************************************************************************/
4222
4223 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4224 {
4225         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4226         bool has_acl = False;
4227         SMB_ACL_ENTRY_T entry;
4228
4229         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4230                 has_acl = True;
4231         }
4232
4233         if (def_acl) {
4234                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4235         }
4236         return has_acl;
4237 }
4238
4239 /****************************************************************************
4240  If the parent directory has no default ACL but it does have an Access ACL,
4241  inherit this Access ACL to file name.
4242 ****************************************************************************/
4243
4244 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4245                        const char *name, mode_t mode)
4246 {
4247         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4248                 return 0;
4249
4250         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4251 }
4252
4253 /****************************************************************************
4254  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4255  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4256 ****************************************************************************/
4257
4258 int fchmod_acl(files_struct *fsp, mode_t mode)
4259 {
4260         connection_struct *conn = fsp->conn;
4261         SMB_ACL_T posix_acl = NULL;
4262         int ret = -1;
4263
4264         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4265                 return -1;
4266
4267         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4268                 goto done;
4269
4270         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4271
4272   done:
4273
4274         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4275         return ret;
4276 }
4277
4278 /****************************************************************************
4279  Map from wire type to permset.
4280 ****************************************************************************/
4281
4282 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4283 {
4284         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4285                 return False;
4286         }
4287
4288         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4289                 return False;
4290         }
4291
4292         if (wire_perm & SMB_POSIX_ACL_READ) {
4293                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4294                         return False;
4295                 }
4296         }
4297         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4298                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4299                         return False;
4300                 }
4301         }
4302         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4303                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4304                         return False;
4305                 }
4306         }
4307         return True;
4308 }
4309
4310 /****************************************************************************
4311  Map from wire type to tagtype.
4312 ****************************************************************************/
4313
4314 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4315 {
4316         switch (wire_tt) {
4317                 case SMB_POSIX_ACL_USER_OBJ:
4318                         *p_tt = SMB_ACL_USER_OBJ;
4319                         break;
4320                 case SMB_POSIX_ACL_USER:
4321                         *p_tt = SMB_ACL_USER;
4322                         break;
4323                 case SMB_POSIX_ACL_GROUP_OBJ:
4324                         *p_tt = SMB_ACL_GROUP_OBJ;
4325                         break;
4326                 case SMB_POSIX_ACL_GROUP:
4327                         *p_tt = SMB_ACL_GROUP;
4328                         break;
4329                 case SMB_POSIX_ACL_MASK:
4330                         *p_tt = SMB_ACL_MASK;
4331                         break;
4332                 case SMB_POSIX_ACL_OTHER:
4333                         *p_tt = SMB_ACL_OTHER;
4334                         break;
4335                 default:
4336                         return False;
4337         }
4338         return True;
4339 }
4340
4341 /****************************************************************************
4342  Create a new POSIX acl from wire permissions.
4343  FIXME ! How does the share mask/mode fit into this.... ?
4344 ****************************************************************************/
4345
4346 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4347 {
4348         unsigned int i;
4349         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4350
4351         if (the_acl == NULL) {
4352                 return NULL;
4353         }
4354
4355         for (i = 0; i < num_acls; i++) {
4356                 SMB_ACL_ENTRY_T the_entry;
4357                 SMB_ACL_PERMSET_T the_permset;
4358                 SMB_ACL_TAG_T tag_type;
4359
4360                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4361                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4362                                 i, strerror(errno) ));
4363                         goto fail;
4364                 }
4365
4366                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4367                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4368                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4369                         goto fail;
4370                 }
4371
4372                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4373                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4374                                 i, strerror(errno) ));
4375                         goto fail;
4376                 }
4377
4378                 /* Get the permset pointer from the new ACL entry. */
4379                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4380                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4381                                 i, strerror(errno) ));
4382                         goto fail;
4383                 }
4384
4385                 /* Map from wire to permissions. */
4386                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4387                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4388                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4389                         goto fail;
4390                 }
4391
4392                 /* Now apply to the new ACL entry. */
4393                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4394                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4395                                 i, strerror(errno) ));
4396                         goto fail;
4397                 }
4398
4399                 if (tag_type == SMB_ACL_USER) {
4400                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4401                         uid_t uid = (uid_t)uidval;
4402                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4403                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4404                                         (unsigned int)uid, i, strerror(errno) ));
4405                                 goto fail;
4406                         }
4407                 }
4408
4409                 if (tag_type == SMB_ACL_GROUP) {
4410                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4411                         gid_t gid = (uid_t)gidval;
4412                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4413                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4414                                         (unsigned int)gid, i, strerror(errno) ));
4415                                 goto fail;
4416                         }
4417                 }
4418         }
4419
4420         return the_acl;
4421
4422  fail:
4423
4424         if (the_acl != NULL) {
4425                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4426         }
4427         return NULL;
4428 }
4429
4430 /****************************************************************************
4431  Calls from UNIX extensions - Default POSIX ACL set.
4432  If num_def_acls == 0 and not a directory just return. If it is a directory
4433  and num_def_acls == 0 then remove the default acl. Else set the default acl
4434  on the directory.
4435 ****************************************************************************/
4436
4437 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4438                                 uint16 num_def_acls, const char *pdata)
4439 {
4440         SMB_ACL_T def_acl = NULL;
4441
4442         if (!S_ISDIR(psbuf->st_ex_mode)) {
4443                 if (num_def_acls) {
4444                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4445                         errno = EISDIR;
4446                         return False;
4447                 } else {
4448                         return True;
4449                 }
4450         }
4451
4452         if (!num_def_acls) {
4453                 /* Remove the default ACL. */
4454                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4455                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4456                                 fname, strerror(errno) ));
4457                         return False;
4458                 }
4459                 return True;
4460         }
4461
4462         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4463                 return False;
4464         }
4465
4466         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4467                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4468                         fname, strerror(errno) ));
4469                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4470                 return False;
4471         }
4472
4473         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4474         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4475         return True;
4476 }
4477
4478 /****************************************************************************
4479  Remove an ACL from a file. As we don't have acl_delete_entry() available
4480  we must read the current acl and copy all entries except MASK, USER and GROUP
4481  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4482  removed.
4483  FIXME ! How does the share mask/mode fit into this.... ?
4484 ****************************************************************************/
4485
4486 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4487 {
4488         SMB_ACL_T file_acl = NULL;
4489         int entry_id = SMB_ACL_FIRST_ENTRY;
4490         SMB_ACL_ENTRY_T entry;
4491         bool ret = False;
4492         /* Create a new ACL with only 3 entries, u/g/w. */
4493         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4494         SMB_ACL_ENTRY_T user_ent = NULL;
4495         SMB_ACL_ENTRY_T group_ent = NULL;
4496         SMB_ACL_ENTRY_T other_ent = NULL;
4497
4498         if (new_file_acl == NULL) {
4499                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4500                 return False;
4501         }
4502
4503         /* Now create the u/g/w entries. */
4504         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4505                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4506                         fname, strerror(errno) ));
4507                 goto done;
4508         }
4509         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4510                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4511                         fname, strerror(errno) ));
4512                 goto done;
4513         }
4514
4515         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4516                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4517                         fname, strerror(errno) ));
4518                 goto done;
4519         }
4520         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4521                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4522                         fname, strerror(errno) ));
4523                 goto done;
4524         }
4525
4526         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4527                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4528                         fname, strerror(errno) ));
4529                 goto done;
4530         }
4531         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4532                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4533                         fname, strerror(errno) ));
4534                 goto done;
4535         }
4536
4537         /* Get the current file ACL. */
4538         if (fsp && fsp->fh->fd != -1) {
4539                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4540         } else {
4541                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4542         }
4543
4544         if (file_acl == NULL) {
4545                 /* This is only returned if an error occurred. Even for a file with
4546                    no acl a u/g/w acl should be returned. */
4547                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4548                         fname, strerror(errno) ));
4549                 goto done;
4550         }
4551
4552         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4553                 SMB_ACL_TAG_T tagtype;
4554                 SMB_ACL_PERMSET_T permset;
4555
4556                 entry_id = SMB_ACL_NEXT_ENTRY;
4557
4558                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4559                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4560                                 fname, strerror(errno) ));
4561                         goto done;
4562                 }
4563
4564                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4565                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4566                                 fname, strerror(errno) ));
4567                         goto done;
4568                 }
4569
4570                 if (tagtype == SMB_ACL_USER_OBJ) {
4571                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4572                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4573                                         fname, strerror(errno) ));
4574                         }
4575                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4576                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4577                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4578                                         fname, strerror(errno) ));
4579                         }
4580                 } else if (tagtype == SMB_ACL_OTHER) {
4581                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4582                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4583                                         fname, strerror(errno) ));
4584                         }
4585                 }
4586         }
4587
4588         /* Set the new empty file ACL. */
4589         if (fsp && fsp->fh->fd != -1) {
4590                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4591                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4592                                 fname, strerror(errno) ));
4593                         goto done;
4594                 }
4595         } else {
4596                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4597                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4598                                 fname, strerror(errno) ));
4599                         goto done;
4600                 }
4601         }
4602
4603         ret = True;
4604
4605  done:
4606
4607         if (file_acl) {
4608                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4609         }
4610         if (new_file_acl) {
4611                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4612         }
4613         return ret;
4614 }
4615
4616 /****************************************************************************
4617  Calls from UNIX extensions - POSIX ACL set.
4618  If num_def_acls == 0 then read/modify/write acl after removing all entries
4619  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4620 ****************************************************************************/
4621
4622 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4623 {
4624         SMB_ACL_T file_acl = NULL;
4625
4626         if (!num_acls) {
4627                 /* Remove the ACL from the file. */
4628                 return remove_posix_acl(conn, fsp, fname);
4629         }
4630
4631         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4632                 return False;
4633         }
4634
4635         if (fsp && fsp->fh->fd != -1) {
4636                 /* The preferred way - use an open fd. */
4637                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4638                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4639                                 fname, strerror(errno) ));
4640                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4641                         return False;
4642                 }
4643         } else {
4644                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4645                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4646                                 fname, strerror(errno) ));
4647                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4648                         return False;
4649                 }
4650         }
4651
4652         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4653         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4654         return True;
4655 }
4656
4657 /********************************************************************
4658  Pull the NT ACL from a file on disk or the OpenEventlog() access
4659  check.  Caller is responsible for freeing the returned security
4660  descriptor via TALLOC_FREE().  This is designed for dealing with
4661  user space access checks in smbd outside of the VFS.  For example,
4662  checking access rights in OpenEventlog().
4663
4664  Assume we are dealing with files (for now)
4665 ********************************************************************/
4666
4667 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4668 {
4669         struct security_descriptor *psd, *ret_sd;
4670         connection_struct *conn;
4671         files_struct finfo;
4672         struct fd_handle fh;
4673         NTSTATUS status;
4674
4675         conn = TALLOC_ZERO_P(ctx, connection_struct);
4676         if (conn == NULL) {
4677                 DEBUG(0, ("talloc failed\n"));
4678                 return NULL;
4679         }
4680
4681         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4682                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4683                 TALLOC_FREE(conn);
4684                 return NULL;
4685         }
4686
4687         conn->params->service = -1;
4688
4689         set_conn_connectpath(conn, "/");
4690
4691         if (!smbd_vfs_init(conn)) {
4692                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4693                 conn_free(conn);
4694                 return NULL;
4695         }
4696
4697         ZERO_STRUCT( finfo );
4698         ZERO_STRUCT( fh );
4699
4700         finfo.fnum = -1;
4701         finfo.conn = conn;
4702         finfo.fh = &fh;
4703         finfo.fh->fd = -1;
4704
4705         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4706                                             &finfo.fsp_name);
4707         if (!NT_STATUS_IS_OK(status)) {
4708                 conn_free(conn);
4709                 return NULL;
4710         }
4711
4712         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4713                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4714                 TALLOC_FREE(finfo.fsp_name);
4715                 conn_free(conn);
4716                 return NULL;
4717         }
4718
4719         ret_sd = dup_sec_desc( ctx, psd );
4720
4721         TALLOC_FREE(finfo.fsp_name);
4722         conn_free(conn);
4723
4724         return ret_sd;
4725 }
4726
4727 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4728
4729 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4730                                         const char *name,
4731                                         SMB_STRUCT_STAT *psbuf,
4732                                         struct security_descriptor **ppdesc)
4733 {
4734         struct dom_sid owner_sid, group_sid;
4735         size_t size = 0;
4736         struct security_ace aces[4];
4737         uint32_t access_mask = 0;
4738         mode_t mode = psbuf->st_ex_mode;
4739         struct security_acl *new_dacl = NULL;
4740         int idx = 0;
4741
4742         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4743                 name, (int)mode ));
4744
4745         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4746         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4747
4748         /*
4749          We provide up to 4 ACEs
4750                 - Owner
4751                 - Group
4752                 - Everyone
4753                 - NT System
4754         */
4755
4756         if (mode & S_IRUSR) {
4757                 if (mode & S_IWUSR) {
4758                         access_mask |= SEC_RIGHTS_FILE_ALL;
4759                 } else {
4760                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4761                 }
4762         }
4763         if (mode & S_IWUSR) {
4764                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4765         }
4766
4767         init_sec_ace(&aces[idx],
4768                         &owner_sid,
4769                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4770                         access_mask,
4771                         0);
4772         idx++;
4773
4774         access_mask = 0;
4775         if (mode & S_IRGRP) {
4776                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4777         }
4778         if (mode & S_IWGRP) {
4779                 /* note that delete is not granted - this matches posix behaviour */
4780                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4781         }
4782         if (access_mask) {
4783                 init_sec_ace(&aces[idx],
4784                         &group_sid,
4785                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4786                         access_mask,
4787                         0);
4788                 idx++;
4789         }
4790
4791         access_mask = 0;
4792         if (mode & S_IROTH) {
4793                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4794         }
4795         if (mode & S_IWOTH) {
4796                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4797         }
4798         if (access_mask) {
4799                 init_sec_ace(&aces[idx],
4800                         &global_sid_World,
4801                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4802                         access_mask,
4803                         0);
4804                 idx++;
4805         }
4806
4807         init_sec_ace(&aces[idx],
4808                         &global_sid_System,
4809                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4810                         SEC_RIGHTS_FILE_ALL,
4811                         0);
4812         idx++;
4813
4814         new_dacl = make_sec_acl(ctx,
4815                         NT4_ACL_REVISION,
4816                         idx,
4817                         aces);
4818
4819         if (!new_dacl) {
4820                 return NT_STATUS_NO_MEMORY;
4821         }
4822
4823         *ppdesc = make_sec_desc(ctx,
4824                         SECURITY_DESCRIPTOR_REVISION_1,
4825                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4826                         &owner_sid,
4827                         &group_sid,
4828                         NULL,
4829                         new_dacl,
4830                         &size);
4831         if (!*ppdesc) {
4832                 return NT_STATUS_NO_MEMORY;
4833         }
4834         return NT_STATUS_OK;
4835 }