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                 /* Start with existing permissions, principle of least
1413                    surprises for the user. */
1414                 pace->perms = pst->st_ex_mode;
1415
1416                 if (setting_acl) {
1417                         /* See if the owning user is in any of the other groups in
1418                            the ACE, or if there's a matching user entry.
1419                            If so, OR in the permissions from that entry. */
1420
1421                         canon_ace *pace_iter;
1422
1423                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1424                                 if (pace_iter->type == SMB_ACL_USER &&
1425                                                 pace_iter->unix_ug.uid == pace->unix_ug.uid) {
1426                                         pace->perms |= pace_iter->perms;
1427                                 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1428                                         if (uid_entry_in_group(conn, pace, pace_iter)) {
1429                                                 pace->perms |= pace_iter->perms;
1430                                         }
1431                                 }
1432                         }
1433
1434                         if (pace->perms == 0) {
1435                                 /* If we only got an "everyone" perm, just use that. */
1436                                 if (got_other)
1437                                         pace->perms = pace_other->perms;
1438                         }
1439
1440                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1441                 } else {
1442                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1443                 }
1444
1445                 DLIST_ADD(*pp_ace, pace);
1446         }
1447
1448         if (!got_grp) {
1449                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1450                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1451                         return False;
1452                 }
1453
1454                 ZERO_STRUCTP(pace);
1455                 pace->type = SMB_ACL_GROUP_OBJ;
1456                 pace->owner_type = GID_ACE;
1457                 pace->unix_ug.uid = pst->st_ex_gid;
1458                 pace->trustee = *pfile_grp_sid;
1459                 pace->attr = ALLOW_ACE;
1460                 if (setting_acl) {
1461                         /* If we only got an "everyone" perm, just use that. */
1462                         if (got_other)
1463                                 pace->perms = pace_other->perms;
1464                         else
1465                                 pace->perms = 0;
1466                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1467                 } else {
1468                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1469                 }
1470
1471                 DLIST_ADD(*pp_ace, pace);
1472         }
1473
1474         if (!got_other) {
1475                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1476                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1477                         return False;
1478                 }
1479
1480                 ZERO_STRUCTP(pace);
1481                 pace->type = SMB_ACL_OTHER;
1482                 pace->owner_type = WORLD_ACE;
1483                 pace->unix_ug.world = -1;
1484                 pace->trustee = global_sid_World;
1485                 pace->attr = ALLOW_ACE;
1486                 if (setting_acl) {
1487                         pace->perms = 0;
1488                         apply_default_perms(params, is_directory, pace, S_IROTH);
1489                 } else
1490                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1491
1492                 DLIST_ADD(*pp_ace, pace);
1493         }
1494
1495         return True;
1496 }
1497
1498 /****************************************************************************
1499  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1500  If it does not have them, check if there are any entries where the trustee is the
1501  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1502  Note we must not do this to default directory ACLs.
1503 ****************************************************************************/
1504
1505 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1506 {
1507         bool got_user_obj, got_group_obj;
1508         canon_ace *current_ace;
1509         int i, entries;
1510
1511         entries = count_canon_ace_list(ace);
1512         got_user_obj = False;
1513         got_group_obj = False;
1514
1515         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1516                 if (current_ace->type == SMB_ACL_USER_OBJ)
1517                         got_user_obj = True;
1518                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1519                         got_group_obj = True;
1520         }
1521         if (got_user_obj && got_group_obj) {
1522                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1523                 return;
1524         }
1525
1526         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1527                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1528                                 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1529                         current_ace->type = SMB_ACL_USER_OBJ;
1530                         got_user_obj = True;
1531                 }
1532                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1533                                 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1534                         current_ace->type = SMB_ACL_GROUP_OBJ;
1535                         got_group_obj = True;
1536                 }
1537         }
1538         if (!got_user_obj)
1539                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1540         if (!got_group_obj)
1541                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1542 }
1543
1544 /****************************************************************************
1545  Unpack a struct security_descriptor into two canonical ace lists.
1546 ****************************************************************************/
1547
1548 static bool create_canon_ace_lists(files_struct *fsp,
1549                                         const SMB_STRUCT_STAT *pst,
1550                                         struct dom_sid *pfile_owner_sid,
1551                                         struct dom_sid *pfile_grp_sid,
1552                                         canon_ace **ppfile_ace,
1553                                         canon_ace **ppdir_ace,
1554                                         const struct security_acl *dacl)
1555 {
1556         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1557         canon_ace *file_ace = NULL;
1558         canon_ace *dir_ace = NULL;
1559         canon_ace *current_ace = NULL;
1560         bool got_dir_allow = False;
1561         bool got_file_allow = False;
1562         int i, j;
1563
1564         *ppfile_ace = NULL;
1565         *ppdir_ace = NULL;
1566
1567         /*
1568          * Convert the incoming ACL into a more regular form.
1569          */
1570
1571         for(i = 0; i < dacl->num_aces; i++) {
1572                 struct security_ace *psa = &dacl->aces[i];
1573
1574                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1575                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1576                         return False;
1577                 }
1578
1579                 if (nt4_compatible_acls()) {
1580                         /*
1581                          * The security mask may be UNIX_ACCESS_NONE which should map into
1582                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1583                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1584                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1585                          */
1586
1587                         /*
1588                          * Convert GENERIC bits to specific bits.
1589                          */
1590
1591                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1592
1593                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1594
1595                         if(psa->access_mask != UNIX_ACCESS_NONE)
1596                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1597                 }
1598         }
1599
1600         /*
1601          * Deal with the fact that NT 4.x re-writes the canonical format
1602          * that we return for default ACLs. If a directory ACE is identical
1603          * to a inherited directory ACE then NT changes the bits so that the
1604          * first ACE is set to OI|IO and the second ACE for this SID is set
1605          * to CI. We need to repair this. JRA.
1606          */
1607
1608         for(i = 0; i < dacl->num_aces; i++) {
1609                 struct security_ace *psa1 = &dacl->aces[i];
1610
1611                 for (j = i + 1; j < dacl->num_aces; j++) {
1612                         struct security_ace *psa2 = &dacl->aces[j];
1613
1614                         if (psa1->access_mask != psa2->access_mask)
1615                                 continue;
1616
1617                         if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1618                                 continue;
1619
1620                         /*
1621                          * Ok - permission bits and SIDs are equal.
1622                          * Check if flags were re-written.
1623                          */
1624
1625                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1626
1627                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1628                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1629
1630                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1631
1632                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1633                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1634
1635                         }
1636                 }
1637         }
1638
1639         for(i = 0; i < dacl->num_aces; i++) {
1640                 struct security_ace *psa = &dacl->aces[i];
1641
1642                 /*
1643                  * Create a canon_ace entry representing this NT DACL ACE.
1644                  */
1645
1646                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1647                         free_canon_ace_list(file_ace);
1648                         free_canon_ace_list(dir_ace);
1649                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1650                         return False;
1651                 }
1652
1653                 ZERO_STRUCTP(current_ace);
1654
1655                 sid_copy(&current_ace->trustee, &psa->trustee);
1656
1657                 /*
1658                  * Try and work out if the SID is a user or group
1659                  * as we need to flag these differently for POSIX.
1660                  * Note what kind of a POSIX ACL this should map to.
1661                  */
1662
1663                 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1664                         current_ace->owner_type = WORLD_ACE;
1665                         current_ace->unix_ug.world = -1;
1666                         current_ace->type = SMB_ACL_OTHER;
1667                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1668                         current_ace->owner_type = UID_ACE;
1669                         current_ace->unix_ug.uid = pst->st_ex_uid;
1670                         current_ace->type = SMB_ACL_USER_OBJ;
1671
1672                         /*
1673                          * The Creator Owner entry only specifies inheritable permissions,
1674                          * never access permissions. WinNT doesn't always set the ACE to
1675                          * INHERIT_ONLY, though.
1676                          */
1677
1678                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1679
1680                 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1681                         current_ace->owner_type = GID_ACE;
1682                         current_ace->unix_ug.gid = pst->st_ex_gid;
1683                         current_ace->type = SMB_ACL_GROUP_OBJ;
1684
1685                         /*
1686                          * The Creator Group entry only specifies inheritable permissions,
1687                          * never access permissions. WinNT doesn't always set the ACE to
1688                          * INHERIT_ONLY, though.
1689                          */
1690                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1691
1692                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1693                         current_ace->owner_type = UID_ACE;
1694                         /* If it's the owning user, this is a user_obj, not
1695                          * a user. */
1696                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1697                                 current_ace->type = SMB_ACL_USER_OBJ;
1698                         } else {
1699                                 current_ace->type = SMB_ACL_USER;
1700                         }
1701                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1702                         current_ace->owner_type = GID_ACE;
1703                         /* If it's the primary group, this is a group_obj, not
1704                          * a group. */
1705                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1706                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1707                         } else {
1708                                 current_ace->type = SMB_ACL_GROUP;
1709                         }
1710                 } else {
1711                         /*
1712                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1713                          */
1714
1715                         if (non_mappable_sid(&psa->trustee)) {
1716                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1717                                            "non-mappable SID %s\n",
1718                                            sid_string_dbg(&psa->trustee)));
1719                                 SAFE_FREE(current_ace);
1720                                 continue;
1721                         }
1722
1723                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1724                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1725                                         "unknown or foreign SID %s\n",
1726                                         sid_string_dbg(&psa->trustee)));
1727                                 SAFE_FREE(current_ace);
1728                                 continue;
1729                         }
1730
1731                         free_canon_ace_list(file_ace);
1732                         free_canon_ace_list(dir_ace);
1733                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1734                                   "%s to uid or gid.\n",
1735                                   sid_string_dbg(&current_ace->trustee)));
1736                         SAFE_FREE(current_ace);
1737                         return False;
1738                 }
1739
1740                 /*
1741                  * Map the given NT permissions into a UNIX mode_t containing only
1742                  * S_I(R|W|X)USR bits.
1743                  */
1744
1745                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1746                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1747
1748                 /* Store the ace_flag. */
1749                 current_ace->ace_flags = psa->flags;
1750
1751                 /*
1752                  * Now add the created ace to either the file list, the directory
1753                  * list, or both. We *MUST* preserve the order here (hence we use
1754                  * DLIST_ADD_END) as NT ACLs are order dependent.
1755                  */
1756
1757                 if (fsp->is_directory) {
1758
1759                         /*
1760                          * We can only add to the default POSIX ACE list if the ACE is
1761                          * designed to be inherited by both files and directories.
1762                          */
1763
1764                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1765                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1766
1767                                 canon_ace *current_dir_ace = current_ace;
1768                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1769
1770                                 /*
1771                                  * Note if this was an allow ace. We can't process
1772                                  * any further deny ace's after this.
1773                                  */
1774
1775                                 if (current_ace->attr == ALLOW_ACE)
1776                                         got_dir_allow = True;
1777
1778                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1779                                         DEBUG(0,("create_canon_ace_lists: "
1780                                                  "malformed ACL in "
1781                                                  "inheritable ACL! Deny entry "
1782                                                  "after Allow entry. Failing "
1783                                                  "to set on file %s.\n",
1784                                                  fsp_str_dbg(fsp)));
1785                                         free_canon_ace_list(file_ace);
1786                                         free_canon_ace_list(dir_ace);
1787                                         return False;
1788                                 }
1789
1790                                 if( DEBUGLVL( 10 )) {
1791                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1792                                         print_canon_ace( current_ace, 0);
1793                                 }
1794
1795                                 /*
1796                                  * If this is not an inherit only ACE we need to add a duplicate
1797                                  * to the file acl.
1798                                  */
1799
1800                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1801                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1802
1803                                         if (!dup_ace) {
1804                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1805                                                 free_canon_ace_list(file_ace);
1806                                                 free_canon_ace_list(dir_ace);
1807                                                 return False;
1808                                         }
1809
1810                                         /*
1811                                          * We must not free current_ace here as its
1812                                          * pointer is now owned by the dir_ace list.
1813                                          */
1814                                         current_ace = dup_ace;
1815                                         /* We've essentially split this ace into two,
1816                                          * and added the ace with inheritance request
1817                                          * bits to the directory ACL. Drop those bits for
1818                                          * the ACE we're adding to the file list. */
1819                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1820                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1821                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1822                                 } else {
1823                                         /*
1824                                          * We must not free current_ace here as its
1825                                          * pointer is now owned by the dir_ace list.
1826                                          */
1827                                         current_ace = NULL;
1828                                 }
1829
1830                                 /*
1831                                  * current_ace is now either owned by file_ace
1832                                  * or is NULL. We can safely operate on current_dir_ace
1833                                  * to treat mapping for default acl entries differently
1834                                  * than access acl entries.
1835                                  */
1836
1837                                 if (current_dir_ace->owner_type == UID_ACE) {
1838                                         /*
1839                                          * We already decided above this is a uid,
1840                                          * for default acls ace's only CREATOR_OWNER
1841                                          * maps to ACL_USER_OBJ. All other uid
1842                                          * ace's are ACL_USER.
1843                                          */
1844                                         if (dom_sid_equal(&current_dir_ace->trustee,
1845                                                         &global_sid_Creator_Owner)) {
1846                                                 current_dir_ace->type = SMB_ACL_USER_OBJ;
1847                                         } else {
1848                                                 current_dir_ace->type = SMB_ACL_USER;
1849                                         }
1850                                 }
1851
1852                                 if (current_dir_ace->owner_type == GID_ACE) {
1853                                         /*
1854                                          * We already decided above this is a gid,
1855                                          * for default acls ace's only CREATOR_GROUP
1856                                          * maps to ACL_GROUP_OBJ. All other uid
1857                                          * ace's are ACL_GROUP.
1858                                          */
1859                                         if (dom_sid_equal(&current_dir_ace->trustee,
1860                                                         &global_sid_Creator_Group)) {
1861                                                 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1862                                         } else {
1863                                                 current_dir_ace->type = SMB_ACL_GROUP;
1864                                         }
1865                                 }
1866                         }
1867                 }
1868
1869                 /*
1870                  * Only add to the file ACL if not inherit only.
1871                  */
1872
1873                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1874                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1875
1876                         /*
1877                          * Note if this was an allow ace. We can't process
1878                          * any further deny ace's after this.
1879                          */
1880
1881                         if (current_ace->attr == ALLOW_ACE)
1882                                 got_file_allow = True;
1883
1884                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1885                                 DEBUG(0,("create_canon_ace_lists: malformed "
1886                                          "ACL in file ACL ! Deny entry after "
1887                                          "Allow entry. Failing to set on file "
1888                                          "%s.\n", fsp_str_dbg(fsp)));
1889                                 free_canon_ace_list(file_ace);
1890                                 free_canon_ace_list(dir_ace);
1891                                 return False;
1892                         }
1893
1894                         if( DEBUGLVL( 10 )) {
1895                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1896                                 print_canon_ace( current_ace, 0);
1897                         }
1898                         all_aces_are_inherit_only = False;
1899                         /*
1900                          * We must not free current_ace here as its
1901                          * pointer is now owned by the file_ace list.
1902                          */
1903                         current_ace = NULL;
1904                 }
1905
1906                 /*
1907                  * Free if ACE was not added.
1908                  */
1909
1910                 SAFE_FREE(current_ace);
1911         }
1912
1913         if (fsp->is_directory && all_aces_are_inherit_only) {
1914                 /*
1915                  * Windows 2000 is doing one of these weird 'inherit acl'
1916                  * traverses to conserve NTFS ACL resources. Just pretend
1917                  * there was no DACL sent. JRA.
1918                  */
1919
1920                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1921                 free_canon_ace_list(file_ace);
1922                 free_canon_ace_list(dir_ace);
1923                 file_ace = NULL;
1924                 dir_ace = NULL;
1925         } else {
1926                 /*
1927                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
1928                  * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1929                  * entries can be converted to *_OBJ. Don't do this for the default
1930                  * ACL, we will create them separately for this if needed inside
1931                  * ensure_canon_entry_valid().
1932                  */
1933                 if (file_ace) {
1934                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1935                 }
1936         }
1937
1938         *ppfile_ace = file_ace;
1939         *ppdir_ace = dir_ace;
1940
1941         return True;
1942 }
1943
1944 /****************************************************************************
1945  ASCII art time again... JRA :-).
1946
1947  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1948  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1949  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1950  allow or deny have been merged, so the same SID can only appear once in the deny
1951  list or once in the allow list.
1952
1953  We then process as follows :
1954
1955  ---------------------------------------------------------------------------
1956  First pass - look for a Everyone DENY entry.
1957
1958  If it is deny all (rwx) trunate the list at this point.
1959  Else, walk the list from this point and use the deny permissions of this
1960  entry as a mask on all following allow entries. Finally, delete
1961  the Everyone DENY entry (we have applied it to everything possible).
1962
1963  In addition, in this pass we remove any DENY entries that have
1964  no permissions (ie. they are a DENY nothing).
1965  ---------------------------------------------------------------------------
1966  Second pass - only deal with deny user entries.
1967
1968  DENY user1 (perms XXX)
1969
1970  new_perms = 0
1971  for all following allow group entries where user1 is in group
1972         new_perms |= group_perms;
1973
1974  user1 entry perms = new_perms & ~ XXX;
1975
1976  Convert the deny entry to an allow entry with the new perms and
1977  push to the end of the list. Note if the user was in no groups
1978  this maps to a specific allow nothing entry for this user.
1979
1980  The common case from the NT ACL choser (userX deny all) is
1981  optimised so we don't do the group lookup - we just map to
1982  an allow nothing entry.
1983
1984  What we're doing here is inferring the allow permissions the
1985  person setting the ACE on user1 wanted by looking at the allow
1986  permissions on the groups the user is currently in. This will
1987  be a snapshot, depending on group membership but is the best
1988  we can do and has the advantage of failing closed rather than
1989  open.
1990  ---------------------------------------------------------------------------
1991  Third pass - only deal with deny group entries.
1992
1993  DENY group1 (perms XXX)
1994
1995  for all following allow user entries where user is in group1
1996    user entry perms = user entry perms & ~ XXX;
1997
1998  If there is a group Everyone allow entry with permissions YYY,
1999  convert the group1 entry to an allow entry and modify its
2000  permissions to be :
2001
2002  new_perms = YYY & ~ XXX
2003
2004  and push to the end of the list.
2005
2006  If there is no group Everyone allow entry then convert the
2007  group1 entry to a allow nothing entry and push to the end of the list.
2008
2009  Note that the common case from the NT ACL choser (groupX deny all)
2010  cannot be optimised here as we need to modify user entries who are
2011  in the group to change them to a deny all also.
2012
2013  What we're doing here is modifying the allow permissions of
2014  user entries (which are more specific in POSIX ACLs) to mask
2015  out the explicit deny set on the group they are in. This will
2016  be a snapshot depending on current group membership but is the
2017  best we can do and has the advantage of failing closed rather
2018  than open.
2019  ---------------------------------------------------------------------------
2020  Fourth pass - cope with cumulative permissions.
2021
2022  for all allow user entries, if there exists an allow group entry with
2023  more permissive permissions, and the user is in that group, rewrite the
2024  allow user permissions to contain both sets of permissions.
2025
2026  Currently the code for this is #ifdef'ed out as these semantics make
2027  no sense to me. JRA.
2028  ---------------------------------------------------------------------------
2029
2030  Note we *MUST* do the deny user pass first as this will convert deny user
2031  entries into allow user entries which can then be processed by the deny
2032  group pass.
2033
2034  The above algorithm took a *lot* of thinking about - hence this
2035  explaination :-). JRA.
2036 ****************************************************************************/
2037
2038 /****************************************************************************
2039  Process a canon_ace list entries. This is very complex code. We need
2040  to go through and remove the "deny" permissions from any allow entry that matches
2041  the id of this entry. We have already refused any NT ACL that wasn't in correct
2042  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2043  we just remove it (to fail safe). We have already removed any duplicate ace
2044  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2045  allow entries.
2046 ****************************************************************************/
2047
2048 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2049 {
2050         canon_ace *ace_list = *pp_ace_list;
2051         canon_ace *curr_ace = NULL;
2052         canon_ace *curr_ace_next = NULL;
2053
2054         /* Pass 1 above - look for an Everyone, deny entry. */
2055
2056         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2057                 canon_ace *allow_ace_p;
2058
2059                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2060
2061                 if (curr_ace->attr != DENY_ACE)
2062                         continue;
2063
2064                 if (curr_ace->perms == (mode_t)0) {
2065
2066                         /* Deny nothing entry - delete. */
2067
2068                         DLIST_REMOVE(ace_list, curr_ace);
2069                         continue;
2070                 }
2071
2072                 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2073                         continue;
2074
2075                 /* JRATEST - assert. */
2076                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2077
2078                 if (curr_ace->perms == ALL_ACE_PERMS) {
2079
2080                         /*
2081                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2082                          * list at this point including this entry.
2083                          */
2084
2085                         canon_ace *prev_entry = DLIST_PREV(curr_ace);
2086
2087                         free_canon_ace_list( curr_ace );
2088                         if (prev_entry)
2089                                 DLIST_REMOVE(ace_list, prev_entry);
2090                         else {
2091                                 /* We deleted the entire list. */
2092                                 ace_list = NULL;
2093                         }
2094                         break;
2095                 }
2096
2097                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2098
2099                         /*
2100                          * Only mask off allow entries.
2101                          */
2102
2103                         if (allow_ace_p->attr != ALLOW_ACE)
2104                                 continue;
2105
2106                         allow_ace_p->perms &= ~curr_ace->perms;
2107                 }
2108
2109                 /*
2110                  * Now it's been applied, remove it.
2111                  */
2112
2113                 DLIST_REMOVE(ace_list, curr_ace);
2114         }
2115
2116         /* Pass 2 above - deal with deny user entries. */
2117
2118         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2119                 mode_t new_perms = (mode_t)0;
2120                 canon_ace *allow_ace_p;
2121
2122                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2123
2124                 if (curr_ace->attr != DENY_ACE)
2125                         continue;
2126
2127                 if (curr_ace->owner_type != UID_ACE)
2128                         continue;
2129
2130                 if (curr_ace->perms == ALL_ACE_PERMS) {
2131
2132                         /*
2133                          * Optimisation - this is a deny everything to this user.
2134                          * Convert to an allow nothing and push to the end of the list.
2135                          */
2136
2137                         curr_ace->attr = ALLOW_ACE;
2138                         curr_ace->perms = (mode_t)0;
2139                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2140                         continue;
2141                 }
2142
2143                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2144
2145                         if (allow_ace_p->attr != ALLOW_ACE)
2146                                 continue;
2147
2148                         /* We process GID_ACE and WORLD_ACE entries only. */
2149
2150                         if (allow_ace_p->owner_type == UID_ACE)
2151                                 continue;
2152
2153                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2154                                 new_perms |= allow_ace_p->perms;
2155                 }
2156
2157                 /*
2158                  * Convert to a allow entry, modify the perms and push to the end
2159                  * of the list.
2160                  */
2161
2162                 curr_ace->attr = ALLOW_ACE;
2163                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2164                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2165         }
2166
2167         /* Pass 3 above - deal with deny group entries. */
2168
2169         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2170                 canon_ace *allow_ace_p;
2171                 canon_ace *allow_everyone_p = NULL;
2172
2173                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2174
2175                 if (curr_ace->attr != DENY_ACE)
2176                         continue;
2177
2178                 if (curr_ace->owner_type != GID_ACE)
2179                         continue;
2180
2181                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2182
2183                         if (allow_ace_p->attr != ALLOW_ACE)
2184                                 continue;
2185
2186                         /* Store a pointer to the Everyone allow, if it exists. */
2187                         if (allow_ace_p->owner_type == WORLD_ACE)
2188                                 allow_everyone_p = allow_ace_p;
2189
2190                         /* We process UID_ACE entries only. */
2191
2192                         if (allow_ace_p->owner_type != UID_ACE)
2193                                 continue;
2194
2195                         /* Mask off the deny group perms. */
2196
2197                         if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2198                                 allow_ace_p->perms &= ~curr_ace->perms;
2199                 }
2200
2201                 /*
2202                  * Convert the deny to an allow with the correct perms and
2203                  * push to the end of the list.
2204                  */
2205
2206                 curr_ace->attr = ALLOW_ACE;
2207                 if (allow_everyone_p)
2208                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2209                 else
2210                         curr_ace->perms = (mode_t)0;
2211                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2212         }
2213
2214         /* Doing this fourth pass allows Windows semantics to be layered
2215          * on top of POSIX semantics. I'm not sure if this is desirable.
2216          * For example, in W2K ACLs there is no way to say, "Group X no
2217          * access, user Y full access" if user Y is a member of group X.
2218          * This seems completely broken semantics to me.... JRA.
2219          */
2220
2221 #if 0
2222         /* Pass 4 above - deal with allow entries. */
2223
2224         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2225                 canon_ace *allow_ace_p;
2226
2227                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2228
2229                 if (curr_ace->attr != ALLOW_ACE)
2230                         continue;
2231
2232                 if (curr_ace->owner_type != UID_ACE)
2233                         continue;
2234
2235                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2236
2237                         if (allow_ace_p->attr != ALLOW_ACE)
2238                                 continue;
2239
2240                         /* We process GID_ACE entries only. */
2241
2242                         if (allow_ace_p->owner_type != GID_ACE)
2243                                 continue;
2244
2245                         /* OR in the group perms. */
2246
2247                         if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2248                                 curr_ace->perms |= allow_ace_p->perms;
2249                 }
2250         }
2251 #endif
2252
2253         *pp_ace_list = ace_list;
2254 }
2255
2256 /****************************************************************************
2257  Create a default mode that will be used if a security descriptor entry has
2258  no user/group/world entries.
2259 ****************************************************************************/
2260
2261 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2262 {
2263         int snum = SNUM(fsp->conn);
2264         mode_t and_bits = (mode_t)0;
2265         mode_t or_bits = (mode_t)0;
2266         mode_t mode;
2267
2268         if (interitable_mode) {
2269                 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2270                                  fsp->fsp_name, NULL);
2271         } else {
2272                 mode = S_IRUSR;
2273         }
2274
2275         if (fsp->is_directory)
2276                 mode |= (S_IWUSR|S_IXUSR);
2277
2278         /*
2279          * Now AND with the create mode/directory mode bits then OR with the
2280          * force create mode/force directory mode bits.
2281          */
2282
2283         if (fsp->is_directory) {
2284                 and_bits = lp_dir_security_mask(snum);
2285                 or_bits = lp_force_dir_security_mode(snum);
2286         } else {
2287                 and_bits = lp_security_mask(snum);
2288                 or_bits = lp_force_security_mode(snum);
2289         }
2290
2291         return ((mode & and_bits)|or_bits);
2292 }
2293
2294 /****************************************************************************
2295  Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2296  succeeding.
2297 ****************************************************************************/
2298
2299 static bool unpack_canon_ace(files_struct *fsp,
2300                                 const SMB_STRUCT_STAT *pst,
2301                                 struct dom_sid *pfile_owner_sid,
2302                                 struct dom_sid *pfile_grp_sid,
2303                                 canon_ace **ppfile_ace,
2304                                 canon_ace **ppdir_ace,
2305                                 uint32 security_info_sent,
2306                                 const struct security_descriptor *psd)
2307 {
2308         SMB_STRUCT_STAT st;
2309         canon_ace *file_ace = NULL;
2310         canon_ace *dir_ace = NULL;
2311
2312         *ppfile_ace = NULL;
2313         *ppdir_ace = NULL;
2314
2315         if(security_info_sent == 0) {
2316                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2317                 return False;
2318         }
2319
2320         /*
2321          * If no DACL then this is a chown only security descriptor.
2322          */
2323
2324         if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2325                 return True;
2326
2327         /*
2328          * Now go through the DACL and create the canon_ace lists.
2329          */
2330
2331         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2332                                                                 &file_ace, &dir_ace, psd->dacl))
2333                 return False;
2334
2335         if ((file_ace == NULL) && (dir_ace == NULL)) {
2336                 /* W2K traverse DACL set - ignore. */
2337                 return True;
2338         }
2339
2340         /*
2341          * Go through the canon_ace list and merge entries
2342          * belonging to identical users of identical allow or deny type.
2343          * We can do this as all deny entries come first, followed by
2344          * all allow entries (we have mandated this before accepting this acl).
2345          */
2346
2347         print_canon_ace_list( "file ace - before merge", file_ace);
2348         merge_aces( &file_ace, false);
2349
2350         print_canon_ace_list( "dir ace - before merge", dir_ace);
2351         merge_aces( &dir_ace, true);
2352
2353         /*
2354          * NT ACLs are order dependent. Go through the acl lists and
2355          * process DENY entries by masking the allow entries.
2356          */
2357
2358         print_canon_ace_list( "file ace - before deny", file_ace);
2359         process_deny_list(fsp->conn, &file_ace);
2360
2361         print_canon_ace_list( "dir ace - before deny", dir_ace);
2362         process_deny_list(fsp->conn, &dir_ace);
2363
2364         /*
2365          * A well formed POSIX file or default ACL has at least 3 entries, a
2366          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2367          * and optionally a mask entry. Ensure this is the case.
2368          */
2369
2370         print_canon_ace_list( "file ace - before valid", file_ace);
2371
2372         st = *pst;
2373
2374         /*
2375          * A default 3 element mode entry for a file should be r-- --- ---.
2376          * A default 3 element mode entry for a directory should be rwx --- ---.
2377          */
2378
2379         st.st_ex_mode = create_default_mode(fsp, False);
2380
2381         if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2382                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2383                 free_canon_ace_list(file_ace);
2384                 free_canon_ace_list(dir_ace);
2385                 return False;
2386         }
2387
2388         print_canon_ace_list( "dir ace - before valid", dir_ace);
2389
2390         /*
2391          * A default inheritable 3 element mode entry for a directory should be the
2392          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2393          * it's a directory.
2394          */
2395
2396         st.st_ex_mode = create_default_mode(fsp, True);
2397
2398         if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2399                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2400                 free_canon_ace_list(file_ace);
2401                 free_canon_ace_list(dir_ace);
2402                 return False;
2403         }
2404
2405         print_canon_ace_list( "file ace - return", file_ace);
2406         print_canon_ace_list( "dir ace - return", dir_ace);
2407
2408         *ppfile_ace = file_ace;
2409         *ppdir_ace = dir_ace;
2410         return True;
2411
2412 }
2413
2414 /******************************************************************************
2415  When returning permissions, try and fit NT display
2416  semantics if possible. Note the the canon_entries here must have been malloced.
2417  The list format should be - first entry = owner, followed by group and other user
2418  entries, last entry = other.
2419
2420  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2421  are not ordered, and match on the most specific entry rather than walking a list,
2422  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2423
2424  Entry 0: owner : deny all except read and write.
2425  Entry 1: owner : allow read and write.
2426  Entry 2: group : deny all except read.
2427  Entry 3: group : allow read.
2428  Entry 4: Everyone : allow read.
2429
2430  But NT cannot display this in their ACL editor !
2431 ********************************************************************************/
2432
2433 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2434 {
2435         canon_ace *l_head = *pp_list_head;
2436         canon_ace *owner_ace = NULL;
2437         canon_ace *other_ace = NULL;
2438         canon_ace *ace = NULL;
2439
2440         for (ace = l_head; ace; ace = ace->next) {
2441                 if (ace->type == SMB_ACL_USER_OBJ)
2442                         owner_ace = ace;
2443                 else if (ace->type == SMB_ACL_OTHER) {
2444                         /* Last ace - this is "other" */
2445                         other_ace = ace;
2446                 }
2447         }
2448
2449         if (!owner_ace || !other_ace) {
2450                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2451                         filename ));
2452                 return;
2453         }
2454
2455         /*
2456          * The POSIX algorithm applies to owner first, and other last,
2457          * so ensure they are arranged in this order.
2458          */
2459
2460         if (owner_ace) {
2461                 DLIST_PROMOTE(l_head, owner_ace);
2462         }
2463
2464         if (other_ace) {
2465                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2466         }
2467
2468         /* We have probably changed the head of the list. */
2469
2470         *pp_list_head = l_head;
2471 }
2472
2473 /****************************************************************************
2474  Create a linked list of canonical ACE entries.
2475 ****************************************************************************/
2476
2477 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2478                                    const char *fname, SMB_ACL_T posix_acl,
2479                                    const SMB_STRUCT_STAT *psbuf,
2480                                    const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2481 {
2482         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2483         canon_ace *l_head = NULL;
2484         canon_ace *ace = NULL;
2485         canon_ace *next_ace = NULL;
2486         int entry_id = SMB_ACL_FIRST_ENTRY;
2487         SMB_ACL_ENTRY_T entry;
2488         size_t ace_count;
2489
2490         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2491                 SMB_ACL_TAG_T tagtype;
2492                 SMB_ACL_PERMSET_T permset;
2493                 struct dom_sid sid;
2494                 posix_id unix_ug;
2495                 enum ace_owner owner_type;
2496
2497                 entry_id = SMB_ACL_NEXT_ENTRY;
2498
2499                 /* Is this a MASK entry ? */
2500                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2501                         continue;
2502
2503                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2504                         continue;
2505
2506                 /* Decide which SID to use based on the ACL type. */
2507                 switch(tagtype) {
2508                         case SMB_ACL_USER_OBJ:
2509                                 /* Get the SID from the owner. */
2510                                 sid_copy(&sid, powner);
2511                                 unix_ug.uid = psbuf->st_ex_uid;
2512                                 owner_type = UID_ACE;
2513                                 break;
2514                         case SMB_ACL_USER:
2515                                 {
2516                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2517                                         if (puid == NULL) {
2518                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2519                                                 continue;
2520                                         }
2521                                         uid_to_sid( &sid, *puid);
2522                                         unix_ug.uid = *puid;
2523                                         owner_type = UID_ACE;
2524                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2525                                         break;
2526                                 }
2527                         case SMB_ACL_GROUP_OBJ:
2528                                 /* Get the SID from the owning group. */
2529                                 sid_copy(&sid, pgroup);
2530                                 unix_ug.gid = psbuf->st_ex_gid;
2531                                 owner_type = GID_ACE;
2532                                 break;
2533                         case SMB_ACL_GROUP:
2534                                 {
2535                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2536                                         if (pgid == NULL) {
2537                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2538                                                 continue;
2539                                         }
2540                                         gid_to_sid( &sid, *pgid);
2541                                         unix_ug.gid = *pgid;
2542                                         owner_type = GID_ACE;
2543                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2544                                         break;
2545                                 }
2546                         case SMB_ACL_MASK:
2547                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2548                                 continue; /* Don't count the mask as an entry. */
2549                         case SMB_ACL_OTHER:
2550                                 /* Use the Everyone SID */
2551                                 sid = global_sid_World;
2552                                 unix_ug.world = -1;
2553                                 owner_type = WORLD_ACE;
2554                                 break;
2555                         default:
2556                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2557                                 continue;
2558                 }
2559
2560                 /*
2561                  * Add this entry to the list.
2562                  */
2563
2564                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2565                         goto fail;
2566
2567                 ZERO_STRUCTP(ace);
2568                 ace->type = tagtype;
2569                 ace->perms = convert_permset_to_mode_t(conn, permset);
2570                 ace->attr = ALLOW_ACE;
2571                 ace->trustee = sid;
2572                 ace->unix_ug = unix_ug;
2573                 ace->owner_type = owner_type;
2574                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2575
2576                 DLIST_ADD(l_head, ace);
2577         }
2578
2579         /*
2580          * This next call will ensure we have at least a user/group/world set.
2581          */
2582
2583         if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2584                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2585                                       psbuf, False))
2586                 goto fail;
2587
2588         /*
2589          * Now go through the list, masking the permissions with the
2590          * acl_mask. Ensure all DENY Entries are at the start of the list.
2591          */
2592
2593         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2594
2595         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2596                 next_ace = ace->next;
2597
2598                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2599                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2600                         ace->perms &= acl_mask;
2601
2602                 if (ace->perms == 0) {
2603                         DLIST_PROMOTE(l_head, ace);
2604                 }
2605
2606                 if( DEBUGLVL( 10 ) ) {
2607                         print_canon_ace(ace, ace_count);
2608                 }
2609         }
2610
2611         arrange_posix_perms(fname,&l_head );
2612
2613         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2614
2615         return l_head;
2616
2617   fail:
2618
2619         free_canon_ace_list(l_head);
2620         return NULL;
2621 }
2622
2623 /****************************************************************************
2624  Check if the current user group list contains a given group.
2625 ****************************************************************************/
2626
2627 bool current_user_in_group(connection_struct *conn, gid_t gid)
2628 {
2629         int i;
2630         const struct security_unix_token *utok = get_current_utok(conn);
2631
2632         for (i = 0; i < utok->ngroups; i++) {
2633                 if (utok->groups[i] == gid) {
2634                         return True;
2635                 }
2636         }
2637
2638         return False;
2639 }
2640
2641 /****************************************************************************
2642  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2643 ****************************************************************************/
2644
2645 static bool acl_group_override(connection_struct *conn,
2646                                const struct smb_filename *smb_fname)
2647 {
2648         if ((errno != EPERM) && (errno != EACCES)) {
2649                 return false;
2650         }
2651
2652         /* file primary group == user primary or supplementary group */
2653         if (lp_acl_group_control(SNUM(conn)) &&
2654             current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2655                 return true;
2656         }
2657
2658         /* user has writeable permission */
2659         if (lp_dos_filemode(SNUM(conn)) &&
2660             can_write_to_file(conn, smb_fname)) {
2661                 return true;
2662         }
2663
2664         return false;
2665 }
2666
2667 /****************************************************************************
2668  Attempt to apply an ACL to a file or directory.
2669 ****************************************************************************/
2670
2671 static bool set_canon_ace_list(files_struct *fsp,
2672                                 canon_ace *the_ace,
2673                                 bool default_ace,
2674                                 const SMB_STRUCT_STAT *psbuf,
2675                                 bool *pacl_set_support)
2676 {
2677         connection_struct *conn = fsp->conn;
2678         bool ret = False;
2679         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2680         canon_ace *p_ace;
2681         int i;
2682         SMB_ACL_ENTRY_T mask_entry;
2683         bool got_mask_entry = False;
2684         SMB_ACL_PERMSET_T mask_permset;
2685         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2686         bool needs_mask = False;
2687         mode_t mask_perms = 0;
2688
2689         /* Use the psbuf that was passed in. */
2690         if (psbuf != &fsp->fsp_name->st) {
2691                 fsp->fsp_name->st = *psbuf;
2692         }
2693
2694 #if defined(POSIX_ACL_NEEDS_MASK)
2695         /* HP-UX always wants to have a mask (called "class" there). */
2696         needs_mask = True;
2697 #endif
2698
2699         if (the_acl == NULL) {
2700
2701                 if (!no_acl_syscall_error(errno)) {
2702                         /*
2703                          * Only print this error message if we have some kind of ACL
2704                          * support that's not working. Otherwise we would always get this.
2705                          */
2706                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2707                                 default_ace ? "default" : "file", strerror(errno) ));
2708                 }
2709                 *pacl_set_support = False;
2710                 goto fail;
2711         }
2712
2713         if( DEBUGLVL( 10 )) {
2714                 dbgtext("set_canon_ace_list: setting ACL:\n");
2715                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2716                         print_canon_ace( p_ace, i);
2717                 }
2718         }
2719
2720         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2721                 SMB_ACL_ENTRY_T the_entry;
2722                 SMB_ACL_PERMSET_T the_permset;
2723
2724                 /*
2725                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2726                  * named group entries. But if there is an ACL_MASK entry, it applies
2727                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2728                  * so that it doesn't deny (i.e., mask off) any permissions.
2729                  */
2730
2731                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2732                         needs_mask = True;
2733                         mask_perms |= p_ace->perms;
2734                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2735                         mask_perms |= p_ace->perms;
2736                 }
2737
2738                 /*
2739                  * Get the entry for this ACE.
2740                  */
2741
2742                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2743                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2744                                 i, strerror(errno) ));
2745                         goto fail;
2746                 }
2747
2748                 if (p_ace->type == SMB_ACL_MASK) {
2749                         mask_entry = the_entry;
2750                         got_mask_entry = True;
2751                 }
2752
2753                 /*
2754                  * Ok - we now know the ACL calls should be working, don't
2755                  * allow fallback to chmod.
2756                  */
2757
2758                 *pacl_set_support = True;
2759
2760                 /*
2761                  * Initialise the entry from the canon_ace.
2762                  */
2763
2764                 /*
2765                  * First tell the entry what type of ACE this is.
2766                  */
2767
2768                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2769                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2770                                 i, strerror(errno) ));
2771                         goto fail;
2772                 }
2773
2774                 /*
2775                  * Only set the qualifier (user or group id) if the entry is a user
2776                  * or group id ACE.
2777                  */
2778
2779                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2780                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2781                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2782                                         i, strerror(errno) ));
2783                                 goto fail;
2784                         }
2785                 }
2786
2787                 /*
2788                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2789                  */
2790
2791                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2792                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2793                                 i, strerror(errno) ));
2794                         goto fail;
2795                 }
2796
2797                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2798                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2799                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2800                         goto fail;
2801                 }
2802
2803                 /*
2804                  * ..and apply them to the entry.
2805                  */
2806
2807                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2808                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2809                                 i, strerror(errno) ));
2810                         goto fail;
2811                 }
2812
2813                 if( DEBUGLVL( 10 ))
2814                         print_canon_ace( p_ace, i);
2815
2816         }
2817
2818         if (needs_mask && !got_mask_entry) {
2819                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2820                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2821                         goto fail;
2822                 }
2823
2824                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2825                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2826                         goto fail;
2827                 }
2828
2829                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2830                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2831                         goto fail;
2832                 }
2833
2834                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2835                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2836                         goto fail;
2837                 }
2838
2839                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2840                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2841                         goto fail;
2842                 }
2843         }
2844
2845         /*
2846          * Finally apply it to the file or directory.
2847          */
2848
2849         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2850                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2851                                              the_acl_type, the_acl) == -1) {
2852                         /*
2853                          * Some systems allow all the above calls and only fail with no ACL support
2854                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2855                          */
2856                         if (no_acl_syscall_error(errno)) {
2857                                 *pacl_set_support = False;
2858                         }
2859
2860                         if (acl_group_override(conn, fsp->fsp_name)) {
2861                                 int sret;
2862
2863                                 DEBUG(5,("set_canon_ace_list: acl group "
2864                                          "control on and current user in file "
2865                                          "%s primary group.\n",
2866                                          fsp_str_dbg(fsp)));
2867
2868                                 become_root();
2869                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2870                                     fsp->fsp_name->base_name, the_acl_type,
2871                                     the_acl);
2872                                 unbecome_root();
2873                                 if (sret == 0) {
2874                                         ret = True;
2875                                 }
2876                         }
2877
2878                         if (ret == False) {
2879                                 DEBUG(2,("set_canon_ace_list: "
2880                                          "sys_acl_set_file type %s failed for "
2881                                          "file %s (%s).\n",
2882                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2883                                          "directory default" : "file",
2884                                          fsp_str_dbg(fsp), strerror(errno)));
2885                                 goto fail;
2886                         }
2887                 }
2888         } else {
2889                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2890                         /*
2891                          * Some systems allow all the above calls and only fail with no ACL support
2892                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2893                          */
2894                         if (no_acl_syscall_error(errno)) {
2895                                 *pacl_set_support = False;
2896                         }
2897
2898                         if (acl_group_override(conn, fsp->fsp_name)) {
2899                                 int sret;
2900
2901                                 DEBUG(5,("set_canon_ace_list: acl group "
2902                                          "control on and current user in file "
2903                                          "%s primary group.\n",
2904                                          fsp_str_dbg(fsp)));
2905
2906                                 become_root();
2907                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2908                                 unbecome_root();
2909                                 if (sret == 0) {
2910                                         ret = True;
2911                                 }
2912                         }
2913
2914                         if (ret == False) {
2915                                 DEBUG(2,("set_canon_ace_list: "
2916                                          "sys_acl_set_file failed for file %s "
2917                                          "(%s).\n",
2918                                          fsp_str_dbg(fsp), strerror(errno)));
2919                                 goto fail;
2920                         }
2921                 }
2922         }
2923
2924         ret = True;
2925
2926   fail:
2927
2928         if (the_acl != NULL) {
2929                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2930         }
2931
2932         return ret;
2933 }
2934
2935 /****************************************************************************
2936  Find a particular canon_ace entry.
2937 ****************************************************************************/
2938
2939 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2940 {
2941         while (list) {
2942                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2943                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2944                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2945                         break;
2946                 list = list->next;
2947         }
2948         return list;
2949 }
2950
2951 /****************************************************************************
2952
2953 ****************************************************************************/
2954
2955 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2956 {
2957         SMB_ACL_ENTRY_T entry;
2958
2959         if (!the_acl)
2960                 return NULL;
2961         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2962                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2963                 return NULL;
2964         }
2965         return the_acl;
2966 }
2967
2968 /****************************************************************************
2969  Convert a canon_ace to a generic 3 element permission - if possible.
2970 ****************************************************************************/
2971
2972 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2973
2974 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2975 {
2976         int snum = SNUM(fsp->conn);
2977         size_t ace_count = count_canon_ace_list(file_ace_list);
2978         canon_ace *ace_p;
2979         canon_ace *owner_ace = NULL;
2980         canon_ace *group_ace = NULL;
2981         canon_ace *other_ace = NULL;
2982         mode_t and_bits;
2983         mode_t or_bits;
2984
2985         if (ace_count != 3) {
2986                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2987                          "entries for file %s to convert to posix perms.\n",
2988                          fsp_str_dbg(fsp)));
2989                 return False;
2990         }
2991
2992         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2993                 if (ace_p->owner_type == UID_ACE)
2994                         owner_ace = ace_p;
2995                 else if (ace_p->owner_type == GID_ACE)
2996                         group_ace = ace_p;
2997                 else if (ace_p->owner_type == WORLD_ACE)
2998                         other_ace = ace_p;
2999         }
3000
3001         if (!owner_ace || !group_ace || !other_ace) {
3002                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3003                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3004                 return False;
3005         }
3006
3007         *posix_perms = (mode_t)0;
3008
3009         *posix_perms |= owner_ace->perms;
3010         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3011         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3012         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3013         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3014         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3015         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3016
3017         /* The owner must have at least read access. */
3018
3019         *posix_perms |= S_IRUSR;
3020         if (fsp->is_directory)
3021                 *posix_perms |= (S_IWUSR|S_IXUSR);
3022
3023         /* If requested apply the masks. */
3024
3025         /* Get the initial bits to apply. */
3026
3027         if (fsp->is_directory) {
3028                 and_bits = lp_dir_security_mask(snum);
3029                 or_bits = lp_force_dir_security_mode(snum);
3030         } else {
3031                 and_bits = lp_security_mask(snum);
3032                 or_bits = lp_force_security_mode(snum);
3033         }
3034
3035         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3036
3037         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3038                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3039                   (int)group_ace->perms, (int)other_ace->perms,
3040                   (int)*posix_perms, fsp_str_dbg(fsp)));
3041
3042         return True;
3043 }
3044
3045 /****************************************************************************
3046   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3047   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3048   with CI|OI set so it is inherited and also applies to the directory.
3049   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3050 ****************************************************************************/
3051
3052 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3053 {
3054         size_t i, j;
3055
3056         for (i = 0; i < num_aces; i++) {
3057                 for (j = i+1; j < num_aces; j++) {
3058                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3059                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3060                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3061                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3062
3063                         /* We know the lower number ACE's are file entries. */
3064                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3065                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3066                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3067                                 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3068                                 (i_inh == j_inh) &&
3069                                 (i_flags_ni == 0) &&
3070                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3071                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3072                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3073                                 /*
3074                                  * W2K wants to have access allowed zero access ACE's
3075                                  * at the end of the list. If the mask is zero, merge
3076                                  * the non-inherited ACE onto the inherited ACE.
3077                                  */
3078
3079                                 if (nt_ace_list[i].access_mask == 0) {
3080                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3081                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3082                                         if (num_aces - i - 1 > 0)
3083                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3084                                                                 sizeof(struct security_ace));
3085
3086                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3087                                                 (unsigned int)i, (unsigned int)j ));
3088                                 } else {
3089                                         /*
3090                                          * These are identical except for the flags.
3091                                          * Merge the inherited ACE onto the non-inherited ACE.
3092                                          */
3093
3094                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3095                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3096                                         if (num_aces - j - 1 > 0)
3097                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3098                                                                 sizeof(struct security_ace));
3099
3100                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3101                                                 (unsigned int)j, (unsigned int)i ));
3102                                 }
3103                                 num_aces--;
3104                                 break;
3105                         }
3106                 }
3107         }
3108
3109         return num_aces;
3110 }
3111
3112 /*
3113  * Add or Replace ACE entry.
3114  * In some cases we need to add a specific ACE for compatibility reasons.
3115  * When doing that we must make sure we are not actually creating a duplicate
3116  * entry. So we need to search whether an ACE entry already exist and eventually
3117  * replacce the access mask, or add a completely new entry if none was found.
3118  *
3119  * This function assumes the array has enough space to add a new entry without
3120  * any reallocation of memory.
3121  */
3122
3123 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3124                                 const struct dom_sid *sid, enum security_ace_type type,
3125                                 uint32_t mask, uint8_t flags)
3126 {
3127         int i;
3128
3129         /* first search for a duplicate */
3130         for (i = 0; i < *num_aces; i++) {
3131                 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3132                     (nt_ace_list[i].flags == flags)) break;
3133         }
3134
3135         if (i < *num_aces) { /* found */
3136                 nt_ace_list[i].type = type;
3137                 nt_ace_list[i].access_mask = mask;
3138                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3139                            i, sid_string_dbg(sid), flags));
3140                 return;
3141         }
3142
3143         /* not found, append it */
3144         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3145 }
3146
3147
3148 /****************************************************************************
3149  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3150  the space for the return elements and returns the size needed to return the
3151  security descriptor. This should be the only external function needed for
3152  the UNIX style get ACL.
3153 ****************************************************************************/
3154
3155 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3156                                       const char *name,
3157                                       const SMB_STRUCT_STAT *sbuf,
3158                                       struct pai_val *pal,
3159                                       SMB_ACL_T posix_acl,
3160                                       SMB_ACL_T def_acl,
3161                                       uint32_t security_info,
3162                                       struct security_descriptor **ppdesc)
3163 {
3164         struct dom_sid owner_sid;
3165         struct dom_sid group_sid;
3166         size_t sd_size = 0;
3167         struct security_acl *psa = NULL;
3168         size_t num_acls = 0;
3169         size_t num_def_acls = 0;
3170         size_t num_aces = 0;
3171         canon_ace *file_ace = NULL;
3172         canon_ace *dir_ace = NULL;
3173         struct security_ace *nt_ace_list = NULL;
3174         size_t num_profile_acls = 0;
3175         struct dom_sid orig_owner_sid;
3176         struct security_descriptor *psd = NULL;
3177         int i;
3178
3179         /*
3180          * Get the owner, group and world SIDs.
3181          */
3182
3183         create_file_sids(sbuf, &owner_sid, &group_sid);
3184
3185         if (lp_profile_acls(SNUM(conn))) {
3186                 /* For WXP SP1 the owner must be administrators. */
3187                 sid_copy(&orig_owner_sid, &owner_sid);
3188                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3189                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3190                 num_profile_acls = 3;
3191         }
3192
3193         if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3194
3195                 /*
3196                  * In the optimum case Creator Owner and Creator Group would be used for
3197                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3198                  * would lead to usability problems under Windows: The Creator entries
3199                  * are only available in browse lists of directories and not for files;
3200                  * additionally the identity of the owning group couldn't be determined.
3201                  * We therefore use those identities only for Default ACLs.
3202                  */
3203
3204                 /* Create the canon_ace lists. */
3205                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3206                                             &owner_sid, &group_sid, pal,
3207                                             SMB_ACL_TYPE_ACCESS);
3208
3209                 /* We must have *some* ACLS. */
3210
3211                 if (count_canon_ace_list(file_ace) == 0) {
3212                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3213                         goto done;
3214                 }
3215
3216                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3217                         dir_ace = canonicalise_acl(conn, name, def_acl,
3218                                                    sbuf,
3219                                                    &global_sid_Creator_Owner,
3220                                                    &global_sid_Creator_Group,
3221                                                    pal, SMB_ACL_TYPE_DEFAULT);
3222                 }
3223
3224                 /*
3225                  * Create the NT ACE list from the canonical ace lists.
3226                  */
3227
3228                 {
3229                         canon_ace *ace;
3230                         enum security_ace_type nt_acl_type;
3231
3232                         if (nt4_compatible_acls() && dir_ace) {
3233                                 /*
3234                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3235                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3236                                  * remove entries from the Access ACL if the
3237                                  * corresponding Default ACL entries have also been
3238                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3239                                  * are exceptions. We can do nothing
3240                                  * intelligent if the Default ACL contains entries that
3241                                  * are not also contained in the Access ACL, so this
3242                                  * case will still fail under NT 4.
3243                                  */
3244
3245                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3246                                 if (ace && !ace->perms) {
3247                                         DLIST_REMOVE(dir_ace, ace);
3248                                         SAFE_FREE(ace);
3249
3250                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3251                                         if (ace && !ace->perms) {
3252                                                 DLIST_REMOVE(file_ace, ace);
3253                                                 SAFE_FREE(ace);
3254                                         }
3255                                 }
3256
3257                                 /*
3258                                  * WinNT doesn't usually have Creator Group
3259                                  * in browse lists, so we send this entry to
3260                                  * WinNT even if it contains no relevant
3261                                  * permissions. Once we can add
3262                                  * Creator Group to browse lists we can
3263                                  * re-enable this.
3264                                  */
3265
3266 #if 0
3267                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3268                                 if (ace && !ace->perms) {
3269                                         DLIST_REMOVE(dir_ace, ace);
3270                                         SAFE_FREE(ace);
3271                                 }
3272 #endif
3273
3274                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3275                                 if (ace && !ace->perms) {
3276                                         DLIST_REMOVE(file_ace, ace);
3277                                         SAFE_FREE(ace);
3278                                 }
3279                         }
3280
3281                         num_acls = count_canon_ace_list(file_ace);
3282                         num_def_acls = count_canon_ace_list(dir_ace);
3283
3284                         /* Allocate the ace list. */
3285                         if ((nt_ace_list = SMB_MALLOC_ARRAY(struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3286                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3287                                 goto done;
3288                         }
3289
3290                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3291
3292                         /*
3293                          * Create the NT ACE list from the canonical ace lists.
3294                          */
3295
3296                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3297                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3298                                                 &nt_acl_type,
3299                                                 ace->perms,
3300                                                 S_ISDIR(sbuf->st_ex_mode));
3301                                 init_sec_ace(&nt_ace_list[num_aces++],
3302                                         &ace->trustee,
3303                                         nt_acl_type,
3304                                         acc,
3305                                         ace->ace_flags);
3306                         }
3307
3308                         /* The User must have access to a profile share - even
3309                          * if we can't map the SID. */
3310                         if (lp_profile_acls(SNUM(conn))) {
3311                                 add_or_replace_ace(nt_ace_list, &num_aces,
3312                                                    &global_sid_Builtin_Users,
3313                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3314                                                    FILE_GENERIC_ALL, 0);
3315                         }
3316
3317                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3318                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3319                                                 &nt_acl_type,
3320                                                 ace->perms,
3321                                                 S_ISDIR(sbuf->st_ex_mode));
3322                                 init_sec_ace(&nt_ace_list[num_aces++],
3323                                         &ace->trustee,
3324                                         nt_acl_type,
3325                                         acc,
3326                                         ace->ace_flags |
3327                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3328                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3329                                         SEC_ACE_FLAG_INHERIT_ONLY);
3330                         }
3331
3332                         /* The User must have access to a profile share - even
3333                          * if we can't map the SID. */
3334                         if (lp_profile_acls(SNUM(conn))) {
3335                                 add_or_replace_ace(nt_ace_list, &num_aces,
3336                                                 &global_sid_Builtin_Users,
3337                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3338                                                 FILE_GENERIC_ALL,
3339                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3340                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3341                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3342                         }
3343
3344                         /*
3345                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3346                          * Win2K needs this to get the inheritance correct when replacing ACLs
3347                          * on a directory tree. Based on work by Jim @ IBM.
3348                          */
3349
3350                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3351
3352                         if (lp_profile_acls(SNUM(conn))) {
3353                                 for (i = 0; i < num_aces; i++) {
3354                                         if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3355                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3356                                                                    &orig_owner_sid,
3357                                                                    nt_ace_list[i].type,
3358                                                                    nt_ace_list[i].access_mask,
3359                                                                    nt_ace_list[i].flags);
3360                                                 break;
3361                                         }
3362                                 }
3363                         }
3364                 }
3365
3366                 if (num_aces) {
3367                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3368                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3369                                 goto done;
3370                         }
3371                 }
3372         } /* security_info & SECINFO_DACL */
3373
3374         psd = make_standard_sec_desc( talloc_tos(),
3375                         (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3376                         (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3377                         psa,
3378                         &sd_size);
3379
3380         if(!psd) {
3381                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3382                 sd_size = 0;
3383                 goto done;
3384         }
3385
3386         /*
3387          * Windows 2000: The DACL_PROTECTED flag in the security
3388          * descriptor marks the ACL as non-inheriting, i.e., no
3389          * ACEs from higher level directories propagate to this
3390          * ACL. In the POSIX ACL model permissions are only
3391          * inherited at file create time, so ACLs never contain
3392          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3393          * flag doesn't seem to bother Windows NT.
3394          * Always set this if map acl inherit is turned off.
3395          */
3396         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3397                 psd->type |= SEC_DESC_DACL_PROTECTED;
3398         } else {
3399                 psd->type |= pal->sd_type;
3400         }
3401
3402         if (psd->dacl) {
3403                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3404         }
3405
3406         *ppdesc = psd;
3407
3408  done:
3409
3410         if (posix_acl) {
3411                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3412         }
3413         if (def_acl) {
3414                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3415         }
3416         free_canon_ace_list(file_ace);
3417         free_canon_ace_list(dir_ace);
3418         free_inherited_info(pal);
3419         SAFE_FREE(nt_ace_list);
3420
3421         return NT_STATUS_OK;
3422 }
3423
3424 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3425                            struct security_descriptor **ppdesc)
3426 {
3427         SMB_STRUCT_STAT sbuf;
3428         SMB_ACL_T posix_acl = NULL;
3429         struct pai_val *pal;
3430
3431         *ppdesc = NULL;
3432
3433         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3434                   fsp_str_dbg(fsp)));
3435
3436         /* can it happen that fsp_name == NULL ? */
3437         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3438                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3439                                         security_info, ppdesc);
3440         }
3441
3442         /* Get the stat struct for the owner info. */
3443         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3444                 return map_nt_error_from_unix(errno);
3445         }
3446
3447         /* Get the ACL from the fd. */
3448         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3449
3450         pal = fload_inherited_info(fsp);
3451
3452         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3453                                        &sbuf, pal, posix_acl, NULL,
3454                                        security_info, ppdesc);
3455 }
3456
3457 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3458                           uint32_t security_info, struct security_descriptor **ppdesc)
3459 {
3460         SMB_ACL_T posix_acl = NULL;
3461         SMB_ACL_T def_acl = NULL;
3462         struct pai_val *pal;
3463         struct smb_filename smb_fname;
3464         int ret;
3465
3466         *ppdesc = NULL;
3467
3468         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3469
3470         ZERO_STRUCT(smb_fname);
3471         smb_fname.base_name = discard_const_p(char, name);
3472
3473         /* Get the stat struct for the owner info. */
3474         if (lp_posix_pathnames()) {
3475                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3476         } else {
3477                 ret = SMB_VFS_STAT(conn, &smb_fname);
3478         }
3479
3480         if (ret == -1) {
3481                 return map_nt_error_from_unix(errno);
3482         }
3483
3484         /* Get the ACL from the path. */
3485         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3486
3487         /* If it's a directory get the default POSIX ACL. */
3488         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3489                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3490                 def_acl = free_empty_sys_acl(conn, def_acl);
3491         }
3492
3493         pal = load_inherited_info(conn, name);
3494
3495         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3496                                        posix_acl, def_acl, security_info,
3497                                        ppdesc);
3498 }
3499
3500 /****************************************************************************
3501  Try to chown a file. We will be able to chown it under the following conditions.
3502
3503   1) If we have root privileges, then it will just work.
3504   2) If we have SeRestorePrivilege we can change the user + group to any other user.
3505   3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3506   4) If we have write permission to the file and dos_filemodes is set
3507      then allow chown to the currently authenticated user.
3508 ****************************************************************************/
3509
3510 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3511 {
3512         NTSTATUS status;
3513
3514         if(!CAN_WRITE(fsp->conn)) {
3515                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3516         }
3517
3518         /* Case (1). */
3519         status = vfs_chown_fsp(fsp, uid, gid);
3520         if (NT_STATUS_IS_OK(status)) {
3521                 return status;
3522         }
3523
3524         /* Case (2) / (3) */
3525         if (lp_enable_privileges()) {
3526                 bool has_take_ownership_priv = security_token_has_privilege(
3527                                                 get_current_nttok(fsp->conn),
3528                                                 SEC_PRIV_TAKE_OWNERSHIP);
3529                 bool has_restore_priv = security_token_has_privilege(
3530                                                 get_current_nttok(fsp->conn),
3531                                                 SEC_PRIV_RESTORE);
3532
3533                 if (has_restore_priv) {
3534                         ; /* Case (2) */
3535                 } else if (has_take_ownership_priv) {
3536                         /* Case (3) */
3537                         if (uid == get_current_uid(fsp->conn)) {
3538                                 gid = (gid_t)-1;
3539                         } else {
3540                                 has_take_ownership_priv = false;
3541                         }
3542                 }
3543
3544                 if (has_take_ownership_priv || has_restore_priv) {
3545                         become_root();
3546                         status = vfs_chown_fsp(fsp, uid, gid);
3547                         unbecome_root();
3548                         return status;
3549                 }
3550         }
3551
3552         /* Case (4). */
3553         if (!lp_dos_filemode(SNUM(fsp->conn))) {
3554                 return NT_STATUS_ACCESS_DENIED;
3555         }
3556
3557         /* only allow chown to the current user. This is more secure,
3558            and also copes with the case where the SID in a take ownership ACL is
3559            a local SID on the users workstation
3560         */
3561         if (uid != get_current_uid(fsp->conn)) {
3562                 return NT_STATUS_ACCESS_DENIED;
3563         }
3564
3565         become_root();
3566         /* Keep the current file gid the same. */
3567         status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3568         unbecome_root();
3569
3570         return status;
3571 }
3572
3573 #if 0
3574 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3575
3576 /****************************************************************************
3577  Take care of parent ACL inheritance.
3578 ****************************************************************************/
3579
3580 NTSTATUS append_parent_acl(files_struct *fsp,
3581                                 const struct security_descriptor *pcsd,
3582                                 struct security_descriptor **pp_new_sd)
3583 {
3584         struct smb_filename *smb_dname = NULL;
3585         struct security_descriptor *parent_sd = NULL;
3586         files_struct *parent_fsp = NULL;
3587         TALLOC_CTX *mem_ctx = talloc_tos();
3588         char *parent_name = NULL;
3589         struct security_ace *new_ace = NULL;
3590         unsigned int num_aces = pcsd->dacl->num_aces;
3591         NTSTATUS status;
3592         int info;
3593         unsigned int i, j;
3594         struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3595         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3596
3597         if (psd == NULL) {
3598                 return NT_STATUS_NO_MEMORY;
3599         }
3600
3601         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3602                             NULL)) {
3603                 return NT_STATUS_NO_MEMORY;
3604         }
3605
3606         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3607                                             &smb_dname);
3608         if (!NT_STATUS_IS_OK(status)) {
3609                 goto fail;
3610         }
3611
3612         status = SMB_VFS_CREATE_FILE(
3613                 fsp->conn,                              /* conn */
3614                 NULL,                                   /* req */
3615                 0,                                      /* root_dir_fid */
3616                 smb_dname,                              /* fname */
3617                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3618                 FILE_SHARE_NONE,                        /* share_access */
3619                 FILE_OPEN,                              /* create_disposition*/
3620                 FILE_DIRECTORY_FILE,                    /* create_options */
3621                 0,                                      /* file_attributes */
3622                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3623                 0,                                      /* allocation_size */
3624                 NULL,                                   /* sd */
3625                 NULL,                                   /* ea_list */
3626                 &parent_fsp,                            /* result */
3627                 &info);                                 /* pinfo */
3628
3629         if (!NT_STATUS_IS_OK(status)) {
3630                 TALLOC_FREE(smb_dname);
3631                 return status;
3632         }
3633
3634         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3635                                     SECINFO_DACL, &parent_sd );
3636
3637         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3638         TALLOC_FREE(smb_dname);
3639
3640         if (!NT_STATUS_IS_OK(status)) {
3641                 return status;
3642         }
3643
3644         /*
3645          * Make room for potentially all the ACLs from
3646          * the parent. We used to add the ugw triple here,
3647          * as we knew we were dealing with POSIX ACLs.
3648          * We no longer need to do so as we can guarentee
3649          * that a default ACL from the parent directory will
3650          * be well formed for POSIX ACLs if it came from a
3651          * POSIX ACL source, and if we're not writing to a
3652          * POSIX ACL sink then we don't care if it's not well
3653          * formed. JRA.
3654          */
3655
3656         num_aces += parent_sd->dacl->num_aces;
3657
3658         if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3659                                         num_aces)) == NULL) {
3660                 return NT_STATUS_NO_MEMORY;
3661         }
3662
3663         /* Start by copying in all the given ACE entries. */
3664         for (i = 0; i < psd->dacl->num_aces; i++) {
3665                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3666         }
3667
3668         /*
3669          * Note that we're ignoring "inherit permissions" here
3670          * as that really only applies to newly created files. JRA.
3671          */
3672
3673         /* Finally append any inherited ACEs. */
3674         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3675                 struct security_ace *se = &parent_sd->dacl->aces[j];
3676
3677                 if (fsp->is_directory) {
3678                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3679                                 /* Doesn't apply to a directory - ignore. */
3680                                 DEBUG(10,("append_parent_acl: directory %s "
3681                                         "ignoring non container "
3682                                         "inherit flags %u on ACE with sid %s "
3683                                         "from parent %s\n",
3684                                         fsp_str_dbg(fsp),
3685                                         (unsigned int)se->flags,
3686                                         sid_string_dbg(&se->trustee),
3687                                         parent_name));
3688                                 continue;
3689                         }
3690                 } else {
3691                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3692                                 /* Doesn't apply to a file - ignore. */
3693                                 DEBUG(10,("append_parent_acl: file %s "
3694                                         "ignoring non object "
3695                                         "inherit flags %u on ACE with sid %s "
3696                                         "from parent %s\n",
3697                                         fsp_str_dbg(fsp),
3698                                         (unsigned int)se->flags,
3699                                         sid_string_dbg(&se->trustee),
3700                                         parent_name));
3701                                 continue;
3702                         }
3703                 }
3704
3705                 if (is_dacl_protected) {
3706                         /* If the DACL is protected it means we must
3707                          * not overwrite an existing ACE entry with the
3708                          * same SID. This is order N^2. Ouch :-(. JRA. */
3709                         unsigned int k;
3710                         for (k = 0; k < psd->dacl->num_aces; k++) {
3711                                 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3712                                                 &se->trustee)) {
3713                                         break;
3714                                 }
3715                         }
3716                         if (k < psd->dacl->num_aces) {
3717                                 /* SID matched. Ignore. */
3718                                 DEBUG(10,("append_parent_acl: path %s "
3719                                         "ignoring ACE with protected sid %s "
3720                                         "from parent %s\n",
3721                                         fsp_str_dbg(fsp),
3722                                         sid_string_dbg(&se->trustee),
3723                                         parent_name));
3724                                 continue;
3725                         }
3726                 }
3727
3728                 sec_ace_copy(&new_ace[i], se);
3729                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3730                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3731                 }
3732                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3733
3734                 if (fsp->is_directory) {
3735                         /*
3736                          * Strip off any inherit only. It's applied.
3737                          */
3738                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3739                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3740                                 /* No further inheritance. */
3741                                 new_ace[i].flags &=
3742                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3743                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3744                         }
3745                 } else {
3746                         /*
3747                          * Strip off any container or inherit
3748                          * flags, they can't apply to objects.
3749                          */
3750                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3751                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3752                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3753                 }
3754                 i++;
3755
3756                 DEBUG(10,("append_parent_acl: path %s "
3757                         "inheriting ACE with sid %s "
3758                         "from parent %s\n",
3759                         fsp_str_dbg(fsp),
3760                         sid_string_dbg(&se->trustee),
3761                         parent_name));
3762         }
3763
3764         psd->dacl->aces = new_ace;
3765         psd->dacl->num_aces = i;
3766         psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3767                          SEC_DESC_DACL_AUTO_INHERIT_REQ);
3768
3769         *pp_new_sd = psd;
3770         return status;
3771 }
3772 #endif
3773
3774 /****************************************************************************
3775  Reply to set a security descriptor on an fsp. security_info_sent is the
3776  description of the following NT ACL.
3777  This should be the only external function needed for the UNIX style set ACL.
3778  We make a copy of psd_orig as internal functions modify the elements inside
3779  it, even though it's a const pointer.
3780 ****************************************************************************/
3781
3782 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3783 {
3784         connection_struct *conn = fsp->conn;
3785         uid_t user = (uid_t)-1;
3786         gid_t grp = (gid_t)-1;
3787         struct dom_sid file_owner_sid;
3788         struct dom_sid file_grp_sid;
3789         canon_ace *file_ace_list = NULL;
3790         canon_ace *dir_ace_list = NULL;
3791         bool acl_perms = False;
3792         mode_t orig_mode = (mode_t)0;
3793         NTSTATUS status;
3794         bool set_acl_as_root = false;
3795         bool acl_set_support = false;
3796         bool ret = false;
3797         struct security_descriptor *psd = NULL;
3798
3799         DEBUG(10,("set_nt_acl: called for file %s\n",
3800                   fsp_str_dbg(fsp)));
3801
3802         if (!CAN_WRITE(conn)) {
3803                 DEBUG(10,("set acl rejected on read-only share\n"));
3804                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3805         }
3806
3807         if (!psd_orig) {
3808                 return NT_STATUS_INVALID_PARAMETER;
3809         }
3810
3811         psd = dup_sec_desc(talloc_tos(), psd_orig);
3812         if (!psd) {
3813                 return NT_STATUS_NO_MEMORY;
3814         }
3815
3816         /*
3817          * Get the current state of the file.
3818          */
3819
3820         status = vfs_stat_fsp(fsp);
3821         if (!NT_STATUS_IS_OK(status)) {
3822                 return status;
3823         }
3824
3825         /* Save the original element we check against. */
3826         orig_mode = fsp->fsp_name->st.st_ex_mode;
3827
3828         /*
3829          * Unpack the user/group/world id's.
3830          */
3831
3832         /* POSIX can't cope with missing owner/group. */
3833         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3834                 security_info_sent &= ~SECINFO_OWNER;
3835         }
3836         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3837                 security_info_sent &= ~SECINFO_GROUP;
3838         }
3839
3840         status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3841         if (!NT_STATUS_IS_OK(status)) {
3842                 return status;
3843         }
3844
3845         /*
3846          * Do we need to chown ? If so this must be done first as the incoming
3847          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3848          * Noticed by Simo.
3849          */
3850
3851         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3852             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3853
3854                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3855                          fsp_str_dbg(fsp), (unsigned int)user,
3856                          (unsigned int)grp));
3857
3858                 status = try_chown(fsp, user, grp);
3859                 if(!NT_STATUS_IS_OK(status)) {
3860                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3861                                 "= %s.\n", fsp_str_dbg(fsp),
3862                                 (unsigned int)user,
3863                                 (unsigned int)grp,
3864                                 nt_errstr(status)));
3865                         return status;
3866                 }
3867
3868                 /*
3869                  * Recheck the current state of the file, which may have changed.
3870                  * (suid/sgid bits, for instance)
3871                  */
3872
3873                 status = vfs_stat_fsp(fsp);
3874                 if (!NT_STATUS_IS_OK(status)) {
3875                         return status;
3876                 }
3877
3878                 /* Save the original element we check against. */
3879                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3880
3881                 /* If we successfully chowned, we know we must
3882                  * be able to set the acl, so do it as root.
3883                  */
3884                 set_acl_as_root = true;
3885         }
3886
3887         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3888
3889         if((security_info_sent & SECINFO_DACL) &&
3890                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3891                         (psd->dacl == NULL)) {
3892                 struct security_ace ace[3];
3893
3894                 /* We can't have NULL DACL in POSIX.
3895                    Use owner/group/Everyone -> full access. */
3896
3897                 init_sec_ace(&ace[0],
3898                                 &file_owner_sid,
3899                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3900                                 GENERIC_ALL_ACCESS,
3901                                 0);
3902                 init_sec_ace(&ace[1],
3903                                 &file_grp_sid,
3904                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3905                                 GENERIC_ALL_ACCESS,
3906                                 0);
3907                 init_sec_ace(&ace[2],
3908                                 &global_sid_World,
3909                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3910                                 GENERIC_ALL_ACCESS,
3911                                 0);
3912                 psd->dacl = make_sec_acl(talloc_tos(),
3913                                         NT4_ACL_REVISION,
3914                                         3,
3915                                         ace);
3916                 if (psd->dacl == NULL) {
3917                         return NT_STATUS_NO_MEMORY;
3918                 }
3919                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3920         }
3921
3922         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3923                                      &file_grp_sid, &file_ace_list,
3924                                      &dir_ace_list, security_info_sent, psd);
3925
3926         /* Ignore W2K traverse DACL set. */
3927         if (!file_ace_list && !dir_ace_list) {
3928                 return NT_STATUS_OK;
3929         }
3930
3931         if (!acl_perms) {
3932                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3933                 free_canon_ace_list(file_ace_list);
3934                 free_canon_ace_list(dir_ace_list);
3935                 return NT_STATUS_ACCESS_DENIED;
3936         }
3937
3938         /*
3939          * Only change security if we got a DACL.
3940          */
3941
3942         if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3943                 free_canon_ace_list(file_ace_list);
3944                 free_canon_ace_list(dir_ace_list);
3945                 return NT_STATUS_OK;
3946         }
3947
3948         /*
3949          * Try using the POSIX ACL set first. Fall back to chmod if
3950          * we have no ACL support on this filesystem.
3951          */
3952
3953         if (acl_perms && file_ace_list) {
3954                 if (set_acl_as_root) {
3955                         become_root();
3956                 }
3957                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3958                                          &fsp->fsp_name->st, &acl_set_support);
3959                 if (set_acl_as_root) {
3960                         unbecome_root();
3961                 }
3962                 if (acl_set_support && ret == false) {
3963                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3964                                  "%s (%s).\n", fsp_str_dbg(fsp),
3965                                  strerror(errno)));
3966                         free_canon_ace_list(file_ace_list);
3967                         free_canon_ace_list(dir_ace_list);
3968                         return map_nt_error_from_unix(errno);
3969                 }
3970         }
3971
3972         if (acl_perms && acl_set_support && fsp->is_directory) {
3973                 if (dir_ace_list) {
3974                         if (set_acl_as_root) {
3975                                 become_root();
3976                         }
3977                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
3978                                                  &fsp->fsp_name->st,
3979                                                  &acl_set_support);
3980                         if (set_acl_as_root) {
3981                                 unbecome_root();
3982                         }
3983                         if (ret == false) {
3984                                 DEBUG(3,("set_nt_acl: failed to set default "
3985                                          "acl on directory %s (%s).\n",
3986                                          fsp_str_dbg(fsp), strerror(errno)));
3987                                 free_canon_ace_list(file_ace_list);
3988                                 free_canon_ace_list(dir_ace_list);
3989                                 return map_nt_error_from_unix(errno);
3990                         }
3991                 } else {
3992                         int sret = -1;
3993
3994                         /*
3995                          * No default ACL - delete one if it exists.
3996                          */
3997
3998                         if (set_acl_as_root) {
3999                                 become_root();
4000                         }
4001                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4002                             fsp->fsp_name->base_name);
4003                         if (set_acl_as_root) {
4004                                 unbecome_root();
4005                         }
4006                         if (sret == -1) {
4007                                 if (acl_group_override(conn, fsp->fsp_name)) {
4008                                         DEBUG(5,("set_nt_acl: acl group "
4009                                                  "control on and current user "
4010                                                  "in file %s primary group. "
4011                                                  "Override delete_def_acl\n",
4012                                                  fsp_str_dbg(fsp)));
4013
4014                                         become_root();
4015                                         sret =
4016                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4017                                                     conn,
4018                                                     fsp->fsp_name->base_name);
4019                                         unbecome_root();
4020                                 }
4021
4022                                 if (sret == -1) {
4023                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4024                                         free_canon_ace_list(file_ace_list);
4025                                         free_canon_ace_list(dir_ace_list);
4026                                         return map_nt_error_from_unix(errno);
4027                                 }
4028                         }
4029                 }
4030         }
4031
4032         if (acl_set_support) {
4033                 if (set_acl_as_root) {
4034                         become_root();
4035                 }
4036                 store_inheritance_attributes(fsp,
4037                                 file_ace_list,
4038                                 dir_ace_list,
4039                                 psd->type);
4040                 if (set_acl_as_root) {
4041                         unbecome_root();
4042                 }
4043         }
4044
4045         /*
4046          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4047          */
4048
4049         if(!acl_set_support && acl_perms) {
4050                 mode_t posix_perms;
4051
4052                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4053                         free_canon_ace_list(file_ace_list);
4054                         free_canon_ace_list(dir_ace_list);
4055                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4056                                  "posix permissions for file %s.\n",
4057                                  fsp_str_dbg(fsp)));
4058                         return NT_STATUS_ACCESS_DENIED;
4059                 }
4060
4061                 if (orig_mode != posix_perms) {
4062                         int sret = -1;
4063
4064                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4065                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4066
4067                         if (set_acl_as_root) {
4068                                 become_root();
4069                         }
4070                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4071                                              posix_perms);
4072                         if (set_acl_as_root) {
4073                                 unbecome_root();
4074                         }
4075                         if(sret == -1) {
4076                                 if (acl_group_override(conn, fsp->fsp_name)) {
4077                                         DEBUG(5,("set_nt_acl: acl group "
4078                                                  "control on and current user "
4079                                                  "in file %s primary group. "
4080                                                  "Override chmod\n",
4081                                                  fsp_str_dbg(fsp)));
4082
4083                                         become_root();
4084                                         sret = SMB_VFS_CHMOD(conn,
4085                                             fsp->fsp_name->base_name,
4086                                             posix_perms);
4087                                         unbecome_root();
4088                                 }
4089
4090                                 if (sret == -1) {
4091                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4092                                                  "failed. Error = %s.\n",
4093                                                  fsp_str_dbg(fsp),
4094                                                  (unsigned int)posix_perms,
4095                                                  strerror(errno)));
4096                                         free_canon_ace_list(file_ace_list);
4097                                         free_canon_ace_list(dir_ace_list);
4098                                         return map_nt_error_from_unix(errno);
4099                                 }
4100                         }
4101                 }
4102         }
4103
4104         free_canon_ace_list(file_ace_list);
4105         free_canon_ace_list(dir_ace_list);
4106
4107         /* Ensure the stat struct in the fsp is correct. */
4108         status = vfs_stat_fsp(fsp);
4109
4110         return NT_STATUS_OK;
4111 }
4112
4113 /****************************************************************************
4114  Get the actual group bits stored on a file with an ACL. Has no effect if
4115  the file has no ACL. Needed in dosmode code where the stat() will return
4116  the mask bits, not the real group bits, for a file with an ACL.
4117 ****************************************************************************/
4118
4119 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4120 {
4121         int entry_id = SMB_ACL_FIRST_ENTRY;
4122         SMB_ACL_ENTRY_T entry;
4123         SMB_ACL_T posix_acl;
4124         int result = -1;
4125
4126         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4127         if (posix_acl == (SMB_ACL_T)NULL)
4128                 return -1;
4129
4130         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4131                 SMB_ACL_TAG_T tagtype;
4132                 SMB_ACL_PERMSET_T permset;
4133
4134                 entry_id = SMB_ACL_NEXT_ENTRY;
4135
4136                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4137                         break;
4138
4139                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4140                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4141                                 break;
4142                         } else {
4143                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4144                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4145                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4146                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4147                                 result = 0;
4148                                 break;
4149                         }
4150                 }
4151         }
4152         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4153         return result;
4154 }
4155
4156 /****************************************************************************
4157  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4158  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4159 ****************************************************************************/
4160
4161 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4162 {
4163         int entry_id = SMB_ACL_FIRST_ENTRY;
4164         SMB_ACL_ENTRY_T entry;
4165         int num_entries = 0;
4166
4167         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4168                 SMB_ACL_TAG_T tagtype;
4169                 SMB_ACL_PERMSET_T permset;
4170                 mode_t perms;
4171
4172                 entry_id = SMB_ACL_NEXT_ENTRY;
4173
4174                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4175                         return -1;
4176
4177                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4178                         return -1;
4179
4180                 num_entries++;
4181
4182                 switch(tagtype) {
4183                         case SMB_ACL_USER_OBJ:
4184                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4185                                 break;
4186                         case SMB_ACL_GROUP_OBJ:
4187                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4188                                 break;
4189                         case SMB_ACL_MASK:
4190                                 /*
4191                                  * FIXME: The ACL_MASK entry permissions should really be set to
4192                                  * the union of the permissions of all ACL_USER,
4193                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4194                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4195                                  */
4196                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4197                                 break;
4198                         case SMB_ACL_OTHER:
4199                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4200                                 break;
4201                         default:
4202                                 continue;
4203                 }
4204
4205                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4206                         return -1;
4207
4208                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4209                         return -1;
4210         }
4211
4212         /*
4213          * If this is a simple 3 element ACL or no elements then it's a standard
4214          * UNIX permission set. Just use chmod...
4215          */
4216
4217         if ((num_entries == 3) || (num_entries == 0))
4218                 return -1;
4219
4220         return 0;
4221 }
4222
4223 /****************************************************************************
4224  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4225  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4226  resulting ACL on TO.  Note that name is in UNIX character set.
4227 ****************************************************************************/
4228
4229 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4230 {
4231         SMB_ACL_T posix_acl = NULL;
4232         int ret = -1;
4233
4234         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4235                 return -1;
4236
4237         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4238                 goto done;
4239
4240         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4241
4242  done:
4243
4244         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4245         return ret;
4246 }
4247
4248 /****************************************************************************
4249  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4250  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4251  Note that name is in UNIX character set.
4252 ****************************************************************************/
4253
4254 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4255 {
4256         return copy_access_posix_acl(conn, name, name, mode);
4257 }
4258
4259 /****************************************************************************
4260  Check for an existing default POSIX ACL on a directory.
4261 ****************************************************************************/
4262
4263 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4264 {
4265         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4266         bool has_acl = False;
4267         SMB_ACL_ENTRY_T entry;
4268
4269         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4270                 has_acl = True;
4271         }
4272
4273         if (def_acl) {
4274                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4275         }
4276         return has_acl;
4277 }
4278
4279 /****************************************************************************
4280  If the parent directory has no default ACL but it does have an Access ACL,
4281  inherit this Access ACL to file name.
4282 ****************************************************************************/
4283
4284 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4285                        const char *name, mode_t mode)
4286 {
4287         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4288                 return 0;
4289
4290         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4291 }
4292
4293 /****************************************************************************
4294  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4295  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4296 ****************************************************************************/
4297
4298 int fchmod_acl(files_struct *fsp, mode_t mode)
4299 {
4300         connection_struct *conn = fsp->conn;
4301         SMB_ACL_T posix_acl = NULL;
4302         int ret = -1;
4303
4304         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4305                 return -1;
4306
4307         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4308                 goto done;
4309
4310         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4311
4312   done:
4313
4314         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4315         return ret;
4316 }
4317
4318 /****************************************************************************
4319  Map from wire type to permset.
4320 ****************************************************************************/
4321
4322 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4323 {
4324         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4325                 return False;
4326         }
4327
4328         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4329                 return False;
4330         }
4331
4332         if (wire_perm & SMB_POSIX_ACL_READ) {
4333                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4334                         return False;
4335                 }
4336         }
4337         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4338                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4339                         return False;
4340                 }
4341         }
4342         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4343                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4344                         return False;
4345                 }
4346         }
4347         return True;
4348 }
4349
4350 /****************************************************************************
4351  Map from wire type to tagtype.
4352 ****************************************************************************/
4353
4354 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4355 {
4356         switch (wire_tt) {
4357                 case SMB_POSIX_ACL_USER_OBJ:
4358                         *p_tt = SMB_ACL_USER_OBJ;
4359                         break;
4360                 case SMB_POSIX_ACL_USER:
4361                         *p_tt = SMB_ACL_USER;
4362                         break;
4363                 case SMB_POSIX_ACL_GROUP_OBJ:
4364                         *p_tt = SMB_ACL_GROUP_OBJ;
4365                         break;
4366                 case SMB_POSIX_ACL_GROUP:
4367                         *p_tt = SMB_ACL_GROUP;
4368                         break;
4369                 case SMB_POSIX_ACL_MASK:
4370                         *p_tt = SMB_ACL_MASK;
4371                         break;
4372                 case SMB_POSIX_ACL_OTHER:
4373                         *p_tt = SMB_ACL_OTHER;
4374                         break;
4375                 default:
4376                         return False;
4377         }
4378         return True;
4379 }
4380
4381 /****************************************************************************
4382  Create a new POSIX acl from wire permissions.
4383  FIXME ! How does the share mask/mode fit into this.... ?
4384 ****************************************************************************/
4385
4386 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4387 {
4388         unsigned int i;
4389         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4390
4391         if (the_acl == NULL) {
4392                 return NULL;
4393         }
4394
4395         for (i = 0; i < num_acls; i++) {
4396                 SMB_ACL_ENTRY_T the_entry;
4397                 SMB_ACL_PERMSET_T the_permset;
4398                 SMB_ACL_TAG_T tag_type;
4399
4400                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4401                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4402                                 i, strerror(errno) ));
4403                         goto fail;
4404                 }
4405
4406                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4407                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4408                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4409                         goto fail;
4410                 }
4411
4412                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4413                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4414                                 i, strerror(errno) ));
4415                         goto fail;
4416                 }
4417
4418                 /* Get the permset pointer from the new ACL entry. */
4419                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4420                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4421                                 i, strerror(errno) ));
4422                         goto fail;
4423                 }
4424
4425                 /* Map from wire to permissions. */
4426                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4427                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4428                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4429                         goto fail;
4430                 }
4431
4432                 /* Now apply to the new ACL entry. */
4433                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4434                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4435                                 i, strerror(errno) ));
4436                         goto fail;
4437                 }
4438
4439                 if (tag_type == SMB_ACL_USER) {
4440                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4441                         uid_t uid = (uid_t)uidval;
4442                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4443                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4444                                         (unsigned int)uid, i, strerror(errno) ));
4445                                 goto fail;
4446                         }
4447                 }
4448
4449                 if (tag_type == SMB_ACL_GROUP) {
4450                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4451                         gid_t gid = (uid_t)gidval;
4452                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4453                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4454                                         (unsigned int)gid, i, strerror(errno) ));
4455                                 goto fail;
4456                         }
4457                 }
4458         }
4459
4460         return the_acl;
4461
4462  fail:
4463
4464         if (the_acl != NULL) {
4465                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4466         }
4467         return NULL;
4468 }
4469
4470 /****************************************************************************
4471  Calls from UNIX extensions - Default POSIX ACL set.
4472  If num_def_acls == 0 and not a directory just return. If it is a directory
4473  and num_def_acls == 0 then remove the default acl. Else set the default acl
4474  on the directory.
4475 ****************************************************************************/
4476
4477 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4478                                 uint16 num_def_acls, const char *pdata)
4479 {
4480         SMB_ACL_T def_acl = NULL;
4481
4482         if (!S_ISDIR(psbuf->st_ex_mode)) {
4483                 if (num_def_acls) {
4484                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4485                         errno = EISDIR;
4486                         return False;
4487                 } else {
4488                         return True;
4489                 }
4490         }
4491
4492         if (!num_def_acls) {
4493                 /* Remove the default ACL. */
4494                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4495                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4496                                 fname, strerror(errno) ));
4497                         return False;
4498                 }
4499                 return True;
4500         }
4501
4502         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4503                 return False;
4504         }
4505
4506         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4507                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4508                         fname, strerror(errno) ));
4509                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4510                 return False;
4511         }
4512
4513         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4514         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4515         return True;
4516 }
4517
4518 /****************************************************************************
4519  Remove an ACL from a file. As we don't have acl_delete_entry() available
4520  we must read the current acl and copy all entries except MASK, USER and GROUP
4521  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4522  removed.
4523  FIXME ! How does the share mask/mode fit into this.... ?
4524 ****************************************************************************/
4525
4526 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4527 {
4528         SMB_ACL_T file_acl = NULL;
4529         int entry_id = SMB_ACL_FIRST_ENTRY;
4530         SMB_ACL_ENTRY_T entry;
4531         bool ret = False;
4532         /* Create a new ACL with only 3 entries, u/g/w. */
4533         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4534         SMB_ACL_ENTRY_T user_ent = NULL;
4535         SMB_ACL_ENTRY_T group_ent = NULL;
4536         SMB_ACL_ENTRY_T other_ent = NULL;
4537
4538         if (new_file_acl == NULL) {
4539                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4540                 return False;
4541         }
4542
4543         /* Now create the u/g/w entries. */
4544         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4545                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4546                         fname, strerror(errno) ));
4547                 goto done;
4548         }
4549         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4550                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4551                         fname, strerror(errno) ));
4552                 goto done;
4553         }
4554
4555         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4556                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4557                         fname, strerror(errno) ));
4558                 goto done;
4559         }
4560         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4561                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4562                         fname, strerror(errno) ));
4563                 goto done;
4564         }
4565
4566         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4567                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4568                         fname, strerror(errno) ));
4569                 goto done;
4570         }
4571         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4572                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4573                         fname, strerror(errno) ));
4574                 goto done;
4575         }
4576
4577         /* Get the current file ACL. */
4578         if (fsp && fsp->fh->fd != -1) {
4579                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4580         } else {
4581                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4582         }
4583
4584         if (file_acl == NULL) {
4585                 /* This is only returned if an error occurred. Even for a file with
4586                    no acl a u/g/w acl should be returned. */
4587                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4588                         fname, strerror(errno) ));
4589                 goto done;
4590         }
4591
4592         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4593                 SMB_ACL_TAG_T tagtype;
4594                 SMB_ACL_PERMSET_T permset;
4595
4596                 entry_id = SMB_ACL_NEXT_ENTRY;
4597
4598                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4599                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4600                                 fname, strerror(errno) ));
4601                         goto done;
4602                 }
4603
4604                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4605                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4606                                 fname, strerror(errno) ));
4607                         goto done;
4608                 }
4609
4610                 if (tagtype == SMB_ACL_USER_OBJ) {
4611                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4612                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4613                                         fname, strerror(errno) ));
4614                         }
4615                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4616                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4617                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4618                                         fname, strerror(errno) ));
4619                         }
4620                 } else if (tagtype == SMB_ACL_OTHER) {
4621                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4622                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4623                                         fname, strerror(errno) ));
4624                         }
4625                 }
4626         }
4627
4628         /* Set the new empty file ACL. */
4629         if (fsp && fsp->fh->fd != -1) {
4630                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4631                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4632                                 fname, strerror(errno) ));
4633                         goto done;
4634                 }
4635         } else {
4636                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4637                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4638                                 fname, strerror(errno) ));
4639                         goto done;
4640                 }
4641         }
4642
4643         ret = True;
4644
4645  done:
4646
4647         if (file_acl) {
4648                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4649         }
4650         if (new_file_acl) {
4651                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4652         }
4653         return ret;
4654 }
4655
4656 /****************************************************************************
4657  Calls from UNIX extensions - POSIX ACL set.
4658  If num_def_acls == 0 then read/modify/write acl after removing all entries
4659  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4660 ****************************************************************************/
4661
4662 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4663 {
4664         SMB_ACL_T file_acl = NULL;
4665
4666         if (!num_acls) {
4667                 /* Remove the ACL from the file. */
4668                 return remove_posix_acl(conn, fsp, fname);
4669         }
4670
4671         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4672                 return False;
4673         }
4674
4675         if (fsp && fsp->fh->fd != -1) {
4676                 /* The preferred way - use an open fd. */
4677                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4678                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4679                                 fname, strerror(errno) ));
4680                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4681                         return False;
4682                 }
4683         } else {
4684                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4685                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4686                                 fname, strerror(errno) ));
4687                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4688                         return False;
4689                 }
4690         }
4691
4692         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4693         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4694         return True;
4695 }
4696
4697 /********************************************************************
4698  Pull the NT ACL from a file on disk or the OpenEventlog() access
4699  check.  Caller is responsible for freeing the returned security
4700  descriptor via TALLOC_FREE().  This is designed for dealing with
4701  user space access checks in smbd outside of the VFS.  For example,
4702  checking access rights in OpenEventlog().
4703
4704  Assume we are dealing with files (for now)
4705 ********************************************************************/
4706
4707 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4708 {
4709         struct security_descriptor *psd, *ret_sd;
4710         connection_struct *conn;
4711         files_struct finfo;
4712         struct fd_handle fh;
4713         NTSTATUS status;
4714
4715         conn = talloc_zero(ctx, connection_struct);
4716         if (conn == NULL) {
4717                 DEBUG(0, ("talloc failed\n"));
4718                 return NULL;
4719         }
4720
4721         if (!(conn->params = talloc(conn, struct share_params))) {
4722                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4723                 TALLOC_FREE(conn);
4724                 return NULL;
4725         }
4726
4727         conn->params->service = -1;
4728
4729         set_conn_connectpath(conn, "/");
4730
4731         if (!smbd_vfs_init(conn)) {
4732                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4733                 conn_free(conn);
4734                 return NULL;
4735         }
4736
4737         ZERO_STRUCT( finfo );
4738         ZERO_STRUCT( fh );
4739
4740         finfo.fnum = -1;
4741         finfo.conn = conn;
4742         finfo.fh = &fh;
4743         finfo.fh->fd = -1;
4744
4745         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4746                                             &finfo.fsp_name);
4747         if (!NT_STATUS_IS_OK(status)) {
4748                 conn_free(conn);
4749                 return NULL;
4750         }
4751
4752         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4753                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4754                 TALLOC_FREE(finfo.fsp_name);
4755                 conn_free(conn);
4756                 return NULL;
4757         }
4758
4759         ret_sd = dup_sec_desc( ctx, psd );
4760
4761         TALLOC_FREE(finfo.fsp_name);
4762         conn_free(conn);
4763
4764         return ret_sd;
4765 }
4766
4767 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4768
4769 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4770                                         const char *name,
4771                                         SMB_STRUCT_STAT *psbuf,
4772                                         struct security_descriptor **ppdesc)
4773 {
4774         struct dom_sid owner_sid, group_sid;
4775         size_t size = 0;
4776         struct security_ace aces[4];
4777         uint32_t access_mask = 0;
4778         mode_t mode = psbuf->st_ex_mode;
4779         struct security_acl *new_dacl = NULL;
4780         int idx = 0;
4781
4782         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4783                 name, (int)mode ));
4784
4785         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4786         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4787
4788         /*
4789          We provide up to 4 ACEs
4790                 - Owner
4791                 - Group
4792                 - Everyone
4793                 - NT System
4794         */
4795
4796         if (mode & S_IRUSR) {
4797                 if (mode & S_IWUSR) {
4798                         access_mask |= SEC_RIGHTS_FILE_ALL;
4799                 } else {
4800                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4801                 }
4802         }
4803         if (mode & S_IWUSR) {
4804                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4805         }
4806
4807         init_sec_ace(&aces[idx],
4808                         &owner_sid,
4809                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4810                         access_mask,
4811                         0);
4812         idx++;
4813
4814         access_mask = 0;
4815         if (mode & S_IRGRP) {
4816                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4817         }
4818         if (mode & S_IWGRP) {
4819                 /* note that delete is not granted - this matches posix behaviour */
4820                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4821         }
4822         if (access_mask) {
4823                 init_sec_ace(&aces[idx],
4824                         &group_sid,
4825                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4826                         access_mask,
4827                         0);
4828                 idx++;
4829         }
4830
4831         access_mask = 0;
4832         if (mode & S_IROTH) {
4833                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4834         }
4835         if (mode & S_IWOTH) {
4836                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4837         }
4838         if (access_mask) {
4839                 init_sec_ace(&aces[idx],
4840                         &global_sid_World,
4841                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4842                         access_mask,
4843                         0);
4844                 idx++;
4845         }
4846
4847         init_sec_ace(&aces[idx],
4848                         &global_sid_System,
4849                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4850                         SEC_RIGHTS_FILE_ALL,
4851                         0);
4852         idx++;
4853
4854         new_dacl = make_sec_acl(ctx,
4855                         NT4_ACL_REVISION,
4856                         idx,
4857                         aces);
4858
4859         if (!new_dacl) {
4860                 return NT_STATUS_NO_MEMORY;
4861         }
4862
4863         *ppdesc = make_sec_desc(ctx,
4864                         SECURITY_DESCRIPTOR_REVISION_1,
4865                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4866                         &owner_sid,
4867                         &group_sid,
4868                         NULL,
4869                         new_dacl,
4870                         &size);
4871         if (!*ppdesc) {
4872                 return NT_STATUS_NO_MEMORY;
4873         }
4874         return NT_STATUS_OK;
4875 }