source3/smbd/posix_acls.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB NT Security Descriptor / Unix permission conversion.
   4    Copyright (C) Jeremy Allison 1994-2009.
   5    Copyright (C) Andreas Gruenbacher 2002.
   6    Copyright (C) Simo Sorce <idra@samba.org> 2009.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23
  24 extern struct current_user current_user;
  25 extern const struct generic_mapping file_generic_mapping;
  26
  27 #undef  DBGC_CLASS
  28 #define DBGC_CLASS DBGC_ACLS
  29
  30 /****************************************************************************
  31  Data structures representing the internal ACE format.
  32 ****************************************************************************/
  33
  34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  36
  37 typedef union posix_id {
  38                 uid_t uid;
  39                 gid_t gid;
  40                 int world;
  41 } posix_id;
  42
  43 typedef struct canon_ace {
  44         struct canon_ace *next, *prev;
  45         SMB_ACL_TAG_T type;
  46         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  47         DOM_SID trustee;
  48         enum ace_owner owner_type;
  49         enum ace_attribute attr;
  50         posix_id unix_ug;
  51         uint8_t ace_flags; /* From windows ACE entry. */
  52 } canon_ace;
  53
  54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  55
  56 /*
  57  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  58  * attribute on disk - version 1.
  59  * All values are little endian.
  60  *
  61  * |  1   |  1   |   2         |         2           |  ....
  62  * +------+------+-------------+---------------------+-------------+--------------------+
  63  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  64  * +------+------+-------------+---------------------+-------------+--------------------+
  65  *
  66  * Entry format is :
  67  *
  68  * |  1   |       4           |
  69  * +------+-------------------+
  70  * | value|  uid/gid or world |
  71  * | type |  value            |
  72  * +------+-------------------+
  73  *
  74  * Version 2 format. Stores extra Windows metadata about an ACL.
  75  *
  76  * |  1   |  2       |   2         |         2           |  ....
  77  * +------+----------+-------------+---------------------+-------------+--------------------+
  78  * | vers | ace      | num_entries | num_default_entries | ..entries.. | default_entries... |
  79  * |   2  |  type    |             |                     |             |                    |
  80  * +------+----------+-------------+---------------------+-------------+--------------------+
  81  *
  82  * Entry format is :
  83  *
  84  * |  1   |  1   |       4           |
  85  * +------+------+-------------------+
  86  * | ace  | value|  uid/gid or world |
  87  * | flag | type |  value            |
  88  * +------+-------------------+------+
  89  *
  90  */
  91
  92 #define PAI_VERSION_OFFSET                      0
  93
  94 #define PAI_V1_FLAG_OFFSET                      1
  95 #define PAI_V1_NUM_ENTRIES_OFFSET               2
  96 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET       4
  97 #define PAI_V1_ENTRIES_BASE                     6
  98 #define PAI_V1_ACL_FLAG_PROTECTED               0x1
  99 #define PAI_V1_ENTRY_LENGTH                     5
 100
 101 #define PAI_V1_VERSION                          1
 102
 103 #define PAI_V2_TYPE_OFFSET                      1
 104 #define PAI_V2_NUM_ENTRIES_OFFSET               3
 105 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET       5
 106 #define PAI_V2_ENTRIES_BASE                     7
 107 #define PAI_V2_ENTRY_LENGTH                     6
 108
 109 #define PAI_V2_VERSION                          2
 110
 111 /*
 112  * In memory format of user.SAMBA_PAI attribute.
 113  */
 114
 115 struct pai_entry {
 116         struct pai_entry *next, *prev;
 117         uint8_t ace_flags;
 118         enum ace_owner owner_type;
 119         posix_id unix_ug;
 120 };
 121
 122 struct pai_val {
 123         uint16_t sd_type;
 124         unsigned int num_entries;
 125         struct pai_entry *entry_list;
 126         unsigned int num_def_entries;
 127         struct pai_entry *def_entry_list;
 128 };
 129
 130 /************************************************************************
 131  Return a uint32 of the pai_entry principal.
 132 ************************************************************************/
 133
 134 static uint32_t get_pai_entry_val(struct pai_entry *paie)
 135 {
 136         switch (paie->owner_type) {
 137                 case UID_ACE:
 138                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 139                         return (uint32_t)paie->unix_ug.uid;
 140                 case GID_ACE:
 141                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 142                         return (uint32_t)paie->unix_ug.gid;
 143                 case WORLD_ACE:
 144                 default:
 145                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 146                         return (uint32_t)-1;
 147         }
 148 }
 149
 150 /************************************************************************
 151  Return a uint32 of the entry principal.
 152 ************************************************************************/
 153
 154 static uint32_t get_entry_val(canon_ace *ace_entry)
 155 {
 156         switch (ace_entry->owner_type) {
 157                 case UID_ACE:
 158                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
 159                         return (uint32_t)ace_entry->unix_ug.uid;
 160                 case GID_ACE:
 161                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
 162                         return (uint32_t)ace_entry->unix_ug.gid;
 163                 case WORLD_ACE:
 164                 default:
 165                         DEBUG(10,("get_entry_val: world ace\n"));
 166                         return (uint32_t)-1;
 167         }
 168 }
 169
 170 /************************************************************************
 171  Create the on-disk format (always v2 now). Caller must free.
 172 ************************************************************************/
 173
 174 static char *create_pai_buf_v2(canon_ace *file_ace_list,
 175                                 canon_ace *dir_ace_list,
 176                                 uint16_t sd_type,
 177                                 size_t *store_size)
 178 {
 179         char *pai_buf = NULL;
 180         canon_ace *ace_list = NULL;
 181         char *entry_offset = NULL;
 182         unsigned int num_entries = 0;
 183         unsigned int num_def_entries = 0;
 184
 185         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 186                 num_entries++;
 187         }
 188
 189         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 190                 num_def_entries++;
 191         }
 192
 193         DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 194
 195         *store_size = PAI_V2_ENTRIES_BASE +
 196                 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
 197
 198         pai_buf = (char *)SMB_MALLOC(*store_size);
 199         if (!pai_buf) {
 200                 return NULL;
 201         }
 202
 203         /* Set up the header. */
 204         memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
 205         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
 206         SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
 207         SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
 208         SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 209
 210         entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
 211
 212         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 213                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 214                 uint32_t entry_val = get_entry_val(ace_list);
 215
 216                 SCVAL(entry_offset,0,ace_list->ace_flags);
 217                 SCVAL(entry_offset,1,type_val);
 218                 SIVAL(entry_offset,2,entry_val);
 219                 entry_offset += PAI_V2_ENTRY_LENGTH;
 220         }
 221
 222         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 223                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 224                 uint32_t entry_val = get_entry_val(ace_list);
 225
 226                 SCVAL(entry_offset,0,ace_list->ace_flags);
 227                 SCVAL(entry_offset,1,type_val);
 228                 SIVAL(entry_offset,2,entry_val);
 229                 entry_offset += PAI_V2_ENTRY_LENGTH;
 230         }
 231
 232         return pai_buf;
 233 }
 234
 235 /************************************************************************
 236  Store the user.SAMBA_PAI attribute on disk.
 237 ************************************************************************/
 238
 239 static void store_inheritance_attributes(files_struct *fsp,
 240                                         canon_ace *file_ace_list,
 241                                         canon_ace *dir_ace_list,
 242                                         uint16_t sd_type)
 243 {
 244         int ret;
 245         size_t store_size;
 246         char *pai_buf;
 247
 248         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 249                 return;
 250         }
 251
 252         pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
 253                                 sd_type, &store_size);
 254
 255         if (fsp->fh->fd != -1) {
 256                 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 257                                 pai_buf, store_size, 0);
 258         } else {
 259                 ret = SMB_VFS_SETXATTR(fsp->conn,fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME,
 260                                 pai_buf, store_size, 0);
 261         }
 262
 263         SAFE_FREE(pai_buf);
 264
 265         DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
 266                 (unsigned int)sd_type,
 267                 fsp->fsp_name));
 268
 269         if (ret == -1 && !no_acl_syscall_error(errno)) {
 270                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 271         }
 272 }
 273
 274 /************************************************************************
 275  Delete the in memory inheritance info.
 276 ************************************************************************/
 277
 278 static void free_inherited_info(struct pai_val *pal)
 279 {
 280         if (pal) {
 281                 struct pai_entry *paie, *paie_next;
 282                 for (paie = pal->entry_list; paie; paie = paie_next) {
 283                         paie_next = paie->next;
 284                         SAFE_FREE(paie);
 285                 }
 286                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 287                         paie_next = paie->next;
 288                         SAFE_FREE(paie);
 289                 }
 290                 SAFE_FREE(pal);
 291         }
 292 }
 293
 294 /************************************************************************
 295  Get any stored ACE flags.
 296 ************************************************************************/
 297
 298 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
 299 {
 300         struct pai_entry *paie;
 301
 302         if (!pal) {
 303                 return 0;
 304         }
 305
 306         /* If the entry exists it is inherited. */
 307         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 308                 if (ace_entry->owner_type == paie->owner_type &&
 309                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 310                         return paie->ace_flags;
 311         }
 312         return 0;
 313 }
 314
 315 /************************************************************************
 316  Ensure an attribute just read is valid - v1.
 317 ************************************************************************/
 318
 319 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
 320 {
 321         uint16 num_entries;
 322         uint16 num_def_entries;
 323
 324         if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
 325                 /* Corrupted - too small. */
 326                 return false;
 327         }
 328
 329         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
 330                 return false;
 331         }
 332
 333         num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
 334         num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 335
 336         /* Check the entry lists match. */
 337         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 338
 339         if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
 340                         PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
 341                 return false;
 342         }
 343
 344         return true;
 345 }
 346
 347 /************************************************************************
 348  Ensure an attribute just read is valid - v2.
 349 ************************************************************************/
 350
 351 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
 352 {
 353         uint16 num_entries;
 354         uint16 num_def_entries;
 355
 356         if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
 357                 /* Corrupted - too small. */
 358                 return false;
 359         }
 360
 361         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
 362                 return false;
 363         }
 364
 365         num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
 366         num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 367
 368         /* Check the entry lists match. */
 369         /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
 370
 371         if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
 372                         PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
 373                 return false;
 374         }
 375
 376         return true;
 377 }
 378
 379 /************************************************************************
 380  Decode the owner.
 381 ************************************************************************/
 382
 383 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
 384 {
 385         paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 386         switch( paie->owner_type) {
 387                 case UID_ACE:
 388                         paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 389                         DEBUG(10,("get_pai_owner_type: uid = %u\n",
 390                                 (unsigned int)paie->unix_ug.uid ));
 391                         break;
 392                 case GID_ACE:
 393                         paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 394                         DEBUG(10,("get_pai_owner_type: gid = %u\n",
 395                                 (unsigned int)paie->unix_ug.gid ));
 396                         break;
 397                 case WORLD_ACE:
 398                         paie->unix_ug.world = -1;
 399                         DEBUG(10,("get_pai_owner_type: world ace\n"));
 400                         break;
 401                 default:
 402                         return false;
 403         }
 404         return true;
 405 }
 406
 407 /************************************************************************
 408  Process v2 entries.
 409 ************************************************************************/
 410
 411 static const char *create_pai_v1_entries(struct pai_val *paiv,
 412                                 const char *entry_offset,
 413                                 bool def_entry)
 414 {
 415         int i;
 416
 417         for (i = 0; i < paiv->num_entries; i++) {
 418                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 419                 if (!paie) {
 420                         return NULL;
 421                 }
 422
 423                 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
 424                 if (!get_pai_owner_type(paie, entry_offset)) {
 425                         return NULL;
 426                 }
 427
 428                 if (!def_entry) {
 429                         DLIST_ADD(paiv->entry_list, paie);
 430                 } else {
 431                         DLIST_ADD(paiv->def_entry_list, paie);
 432                 }
 433                 entry_offset += PAI_V1_ENTRY_LENGTH;
 434         }
 435         return entry_offset;
 436 }
 437
 438 /************************************************************************
 439  Convert to in-memory format from version 1.
 440 ************************************************************************/
 441
 442 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
 443 {
 444         const char *entry_offset;
 445         struct pai_val *paiv = NULL;
 446
 447         if (!check_pai_ok_v1(buf, size)) {
 448                 return NULL;
 449         }
 450
 451         paiv = SMB_MALLOC_P(struct pai_val);
 452         if (!paiv) {
 453                 return NULL;
 454         }
 455
 456         memset(paiv, '\0', sizeof(struct pai_val));
 457
 458         paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
 459                         SE_DESC_DACL_PROTECTED : 0;
 460
 461         paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
 462         paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 463
 464         entry_offset = buf + PAI_V1_ENTRIES_BASE;
 465
 466         DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
 467                         paiv->num_entries, paiv->num_def_entries ));
 468
 469         entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
 470         if (entry_offset == NULL) {
 471                 free_inherited_info(paiv);
 472                 return NULL;
 473         }
 474         entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
 475         if (entry_offset == NULL) {
 476                 free_inherited_info(paiv);
 477                 return NULL;
 478         }
 479
 480         return paiv;
 481 }
 482
 483 /************************************************************************
 484  Process v2 entries.
 485 ************************************************************************/
 486
 487 static const char *create_pai_v2_entries(struct pai_val *paiv,
 488                                 const char *entry_offset,
 489                                 bool def_entry)
 490 {
 491         int i;
 492
 493         for (i = 0; i < paiv->num_entries; i++) {
 494                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 495                 if (!paie) {
 496                         return NULL;
 497                 }
 498
 499                 paie->ace_flags = CVAL(entry_offset,0);
 500
 501                 entry_offset++;
 502
 503                 if (!get_pai_owner_type(paie, entry_offset)) {
 504                         return NULL;
 505                 }
 506                 if (!def_entry) {
 507                         DLIST_ADD(paiv->entry_list, paie);
 508                 } else {
 509                         DLIST_ADD(paiv->def_entry_list, paie);
 510                 }
 511                 entry_offset += PAI_V2_ENTRY_LENGTH;
 512         }
 513         return entry_offset;
 514 }
 515
 516 /************************************************************************
 517  Convert to in-memory format from version 2.
 518 ************************************************************************/
 519
 520 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
 521 {
 522         const char *entry_offset;
 523         struct pai_val *paiv = NULL;
 524
 525         if (!check_pai_ok_v2(buf, size)) {
 526                 return NULL;
 527         }
 528
 529         paiv = SMB_MALLOC_P(struct pai_val);
 530         if (!paiv) {
 531                 return NULL;
 532         }
 533
 534         memset(paiv, '\0', sizeof(struct pai_val));
 535
 536         paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
 537
 538         paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
 539         paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 540
 541         entry_offset = buf + PAI_V2_ENTRIES_BASE;
 542
 543         DEBUG(10,("create_pai_val_v2: num_entries = %u, num_def_entries = %u\n",
 544                         paiv->num_entries, paiv->num_def_entries ));
 545
 546         entry_offset = create_pai_v2_entries(paiv, entry_offset, false);
 547         if (entry_offset == NULL) {
 548                 free_inherited_info(paiv);
 549                 return NULL;
 550         }
 551         entry_offset = create_pai_v2_entries(paiv, entry_offset, true);
 552         if (entry_offset == NULL) {
 553                 free_inherited_info(paiv);
 554                 return NULL;
 555         }
 556
 557         return paiv;
 558 }
 559
 560 /************************************************************************
 561  Convert to in-memory format - from either version 1 or 2.
 562 ************************************************************************/
 563
 564 static struct pai_val *create_pai_val(const char *buf, size_t size)
 565 {
 566         if (size < 1) {
 567                 return NULL;
 568         }
 569         if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
 570                 return create_pai_val_v1(buf, size);
 571         } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
 572                 return create_pai_val_v2(buf, size);
 573         } else {
 574                 return NULL;
 575         }
 576 }
 577
 578 /************************************************************************
 579  Load the user.SAMBA_PAI attribute.
 580 ************************************************************************/
 581
 582 static struct pai_val *fload_inherited_info(files_struct *fsp)
 583 {
 584         char *pai_buf;
 585         size_t pai_buf_size = 1024;
 586         struct pai_val *paiv = NULL;
 587         ssize_t ret;
 588
 589         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 590                 return NULL;
 591         }
 592
 593         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 594                 return NULL;
 595         }
 596
 597         do {
 598                 if (fsp->fh->fd != -1) {
 599                         ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 600                                         pai_buf, pai_buf_size);
 601                 } else {
 602                         ret = SMB_VFS_GETXATTR(fsp->conn,fsp->fsp_name,SAMBA_POSIX_INHERITANCE_EA_NAME,
 603                                         pai_buf, pai_buf_size);
 604                 }
 605
 606                 if (ret == -1) {
 607                         if (errno != ERANGE) {
 608                                 break;
 609                         }
 610                         /* Buffer too small - enlarge it. */
 611                         pai_buf_size *= 2;
 612                         SAFE_FREE(pai_buf);
 613                         if (pai_buf_size > 1024*1024) {
 614                                 return NULL; /* Limit malloc to 1mb. */
 615                         }
 616                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 617                                 return NULL;
 618                 }
 619         } while (ret == -1);
 620
 621         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fsp->fsp_name));
 622
 623         if (ret == -1) {
 624                 /* No attribute or not supported. */
 625 #if defined(ENOATTR)
 626                 if (errno != ENOATTR)
 627                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 628 #else
 629                 if (errno != ENOSYS)
 630                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 631 #endif
 632                 SAFE_FREE(pai_buf);
 633                 return NULL;
 634         }
 635
 636         paiv = create_pai_val(pai_buf, ret);
 637
 638         if (paiv) {
 639                 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
 640                         (unsigned int)paiv->sd_type,
 641                         fsp->fsp_name));
 642         }
 643
 644         SAFE_FREE(pai_buf);
 645         return paiv;
 646 }
 647
 648 /************************************************************************
 649  Load the user.SAMBA_PAI attribute.
 650 ************************************************************************/
 651
 652 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
 653                                            const char *fname)
 654 {
 655         char *pai_buf;
 656         size_t pai_buf_size = 1024;
 657         struct pai_val *paiv = NULL;
 658         ssize_t ret;
 659
 660         if (!lp_map_acl_inherit(SNUM(conn))) {
 661                 return NULL;
 662         }
 663
 664         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 665                 return NULL;
 666         }
 667
 668         do {
 669                 ret = SMB_VFS_GETXATTR(conn, fname,
 670                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 671                                        pai_buf, pai_buf_size);
 672
 673                 if (ret == -1) {
 674                         if (errno != ERANGE) {
 675                                 break;
 676                         }
 677                         /* Buffer too small - enlarge it. */
 678                         pai_buf_size *= 2;
 679                         SAFE_FREE(pai_buf);
 680                         if (pai_buf_size > 1024*1024) {
 681                                 return NULL; /* Limit malloc to 1mb. */
 682                         }
 683                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 684                                 return NULL;
 685                 }
 686         } while (ret == -1);
 687
 688         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
 689
 690         if (ret == -1) {
 691                 /* No attribute or not supported. */
 692 #if defined(ENOATTR)
 693                 if (errno != ENOATTR)
 694                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 695 #else
 696                 if (errno != ENOSYS)
 697                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 698 #endif
 699                 SAFE_FREE(pai_buf);
 700                 return NULL;
 701         }
 702
 703         paiv = create_pai_val(pai_buf, ret);
 704
 705         if (paiv) {
 706                 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
 707                         (unsigned int)paiv->sd_type,
 708                         fname));
 709         }
 710
 711         SAFE_FREE(pai_buf);
 712         return paiv;
 713 }
 714
 715 /****************************************************************************
 716  Functions to manipulate the internal ACE format.
 717 ****************************************************************************/
 718
 719 /****************************************************************************
 720  Count a linked list of canonical ACE entries.
 721 ****************************************************************************/
 722
 723 static size_t count_canon_ace_list( canon_ace *l_head )
 724 {
 725         size_t count = 0;
 726         canon_ace *ace;
 727
 728         for (ace = l_head; ace; ace = ace->next)
 729                 count++;
 730
 731         return count;
 732 }
 733
 734 /****************************************************************************
 735  Free a linked list of canonical ACE entries.
 736 ****************************************************************************/
 737
 738 static void free_canon_ace_list( canon_ace *l_head )
 739 {
 740         canon_ace *list, *next;
 741
 742         for (list = l_head; list; list = next) {
 743                 next = list->next;
 744                 DLIST_REMOVE(l_head, list);
 745                 SAFE_FREE(list);
 746         }
 747 }
 748
 749 /****************************************************************************
 750  Function to duplicate a canon_ace entry.
 751 ****************************************************************************/
 752
 753 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 754 {
 755         canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
 756
 757         if (dst_ace == NULL)
 758                 return NULL;
 759
 760         *dst_ace = *src_ace;
 761         dst_ace->prev = dst_ace->next = NULL;
 762         return dst_ace;
 763 }
 764
 765 /****************************************************************************
 766  Print out a canon ace.
 767 ****************************************************************************/
 768
 769 static void print_canon_ace(canon_ace *pace, int num)
 770 {
 771         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 772         dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
 773         if (pace->owner_type == UID_ACE) {
 774                 const char *u_name = uidtoname(pace->unix_ug.uid);
 775                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
 776         } else if (pace->owner_type == GID_ACE) {
 777                 char *g_name = gidtoname(pace->unix_ug.gid);
 778                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
 779         } else
 780                 dbgtext( "other ");
 781         switch (pace->type) {
 782                 case SMB_ACL_USER:
 783                         dbgtext( "SMB_ACL_USER ");
 784                         break;
 785                 case SMB_ACL_USER_OBJ:
 786                         dbgtext( "SMB_ACL_USER_OBJ ");
 787                         break;
 788                 case SMB_ACL_GROUP:
 789                         dbgtext( "SMB_ACL_GROUP ");
 790                         break;
 791                 case SMB_ACL_GROUP_OBJ:
 792                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 793                         break;
 794                 case SMB_ACL_OTHER:
 795                         dbgtext( "SMB_ACL_OTHER ");
 796                         break;
 797                 default:
 798                         dbgtext( "MASK " );
 799                         break;
 800         }
 801
 802         dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
 803         dbgtext( "perms ");
 804         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 805         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 806         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 807 }
 808
 809 /****************************************************************************
 810  Print out a canon ace list.
 811 ****************************************************************************/
 812
 813 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 814 {
 815         int count = 0;
 816
 817         if( DEBUGLVL( 10 )) {
 818                 dbgtext( "print_canon_ace_list: %s\n", name );
 819                 for (;ace_list; ace_list = ace_list->next, count++)
 820                         print_canon_ace(ace_list, count );
 821         }
 822 }
 823
 824 /****************************************************************************
 825  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 826 ****************************************************************************/
 827
 828 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
 829 {
 830         mode_t ret = 0;
 831
 832         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
 833         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 834         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 835
 836         return ret;
 837 }
 838
 839 /****************************************************************************
 840  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 841 ****************************************************************************/
 842
 843 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 844 {
 845         mode_t ret = 0;
 846
 847         if (mode & r_mask)
 848                 ret |= S_IRUSR;
 849         if (mode & w_mask)
 850                 ret |= S_IWUSR;
 851         if (mode & x_mask)
 852                 ret |= S_IXUSR;
 853
 854         return ret;
 855 }
 856
 857 /****************************************************************************
 858  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 859  an SMB_ACL_PERMSET_T.
 860 ****************************************************************************/
 861
 862 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 863 {
 864         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1)
 865                 return -1;
 866         if (mode & S_IRUSR) {
 867                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
 868                         return -1;
 869         }
 870         if (mode & S_IWUSR) {
 871                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
 872                         return -1;
 873         }
 874         if (mode & S_IXUSR) {
 875                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
 876                         return -1;
 877         }
 878         return 0;
 879 }
 880
 881 /****************************************************************************
 882  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 883 ****************************************************************************/
 884
 885 void create_file_sids(const SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
 886 {
 887         uid_to_sid( powner_sid, psbuf->st_ex_uid );
 888         gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
 889 }
 890
 891 /****************************************************************************
 892  Is the identity in two ACEs equal ? Check both SID and uid/gid.
 893 ****************************************************************************/
 894
 895 static bool identity_in_ace_equal(canon_ace *ace1, canon_ace *ace2)
 896 {
 897         if (sid_equal(&ace1->trustee, &ace2->trustee)) {
 898                 return True;
 899         }
 900         if (ace1->owner_type == ace2->owner_type) {
 901                 if (ace1->owner_type == UID_ACE &&
 902                                 ace1->unix_ug.uid == ace2->unix_ug.uid) {
 903                         return True;
 904                 } else if (ace1->owner_type == GID_ACE &&
 905                                 ace1->unix_ug.gid == ace2->unix_ug.gid) {
 906                         return True;
 907                 }
 908         }
 909         return False;
 910 }
 911
 912 /****************************************************************************
 913  Merge aces with a common sid - if both are allow or deny, OR the permissions together and
 914  delete the second one. If the first is deny, mask the permissions off and delete the allow
 915  if the permissions become zero, delete the deny if the permissions are non zero.
 916 ****************************************************************************/
 917
 918 static void merge_aces( canon_ace **pp_list_head )
 919 {
 920         canon_ace *l_head = *pp_list_head;
 921         canon_ace *curr_ace_outer;
 922         canon_ace *curr_ace_outer_next;
 923
 924         /*
 925          * First, merge allow entries with identical SIDs, and deny entries
 926          * with identical SIDs.
 927          */
 928
 929         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 930                 canon_ace *curr_ace;
 931                 canon_ace *curr_ace_next;
 932
 933                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 934
 935                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 936
 937                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 938
 939                         if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
 940                                 (curr_ace->attr == curr_ace_outer->attr)) {
 941
 942                                 if( DEBUGLVL( 10 )) {
 943                                         dbgtext("merge_aces: Merging ACE's\n");
 944                                         print_canon_ace( curr_ace_outer, 0);
 945                                         print_canon_ace( curr_ace, 0);
 946                                 }
 947
 948                                 /* Merge two allow or two deny ACE's. */
 949
 950                                 curr_ace_outer->perms |= curr_ace->perms;
 951                                 DLIST_REMOVE(l_head, curr_ace);
 952                                 SAFE_FREE(curr_ace);
 953                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 954                         }
 955                 }
 956         }
 957
 958         /*
 959          * Now go through and mask off allow permissions with deny permissions.
 960          * We can delete either the allow or deny here as we know that each SID
 961          * appears only once in the list.
 962          */
 963
 964         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 965                 canon_ace *curr_ace;
 966                 canon_ace *curr_ace_next;
 967
 968                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 969
 970                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 971
 972                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 973
 974                         /*
 975                          * Subtract ACE's with different entries. Due to the ordering constraints
 976                          * we've put on the ACL, we know the deny must be the first one.
 977                          */
 978
 979                         if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
 980                                 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
 981
 982                                 if( DEBUGLVL( 10 )) {
 983                                         dbgtext("merge_aces: Masking ACE's\n");
 984                                         print_canon_ace( curr_ace_outer, 0);
 985                                         print_canon_ace( curr_ace, 0);
 986                                 }
 987
 988                                 curr_ace->perms &= ~curr_ace_outer->perms;
 989
 990                                 if (curr_ace->perms == 0) {
 991
 992                                         /*
 993                                          * The deny overrides the allow. Remove the allow.
 994                                          */
 995
 996                                         DLIST_REMOVE(l_head, curr_ace);
 997                                         SAFE_FREE(curr_ace);
 998                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 999
1000                                 } else {
1001
1002                                         /*
1003                                          * Even after removing permissions, there
1004                                          * are still allow permissions - delete the deny.
1005                                          * It is safe to delete the deny here,
1006                                          * as we are guarenteed by the deny first
1007                                          * ordering that all the deny entries for
1008                                          * this SID have already been merged into one
1009                                          * before we can get to an allow ace.
1010                                          */
1011
1012                                         DLIST_REMOVE(l_head, curr_ace_outer);
1013                                         SAFE_FREE(curr_ace_outer);
1014                                         break;
1015                                 }
1016                         }
1017
1018                 } /* end for curr_ace */
1019         } /* end for curr_ace_outer */
1020
1021         /* We may have modified the list. */
1022
1023         *pp_list_head = l_head;
1024 }
1025
1026 /****************************************************************************
1027  Check if we need to return NT4.x compatible ACL entries.
1028 ****************************************************************************/
1029
1030 bool nt4_compatible_acls(void)
1031 {
1032         int compat = lp_acl_compatibility();
1033
1034         if (compat == ACL_COMPAT_AUTO) {
1035                 enum remote_arch_types ra_type = get_remote_arch();
1036
1037                 /* Automatically adapt to client */
1038                 return (ra_type <= RA_WINNT);
1039         } else
1040                 return (compat == ACL_COMPAT_WINNT);
1041 }
1042
1043
1044 /****************************************************************************
1045  Map canon_ace perms to permission bits NT.
1046  The attr element is not used here - we only process deny entries on set,
1047  not get. Deny entries are implicit on get with ace->perms = 0.
1048 ****************************************************************************/
1049
1050 static uint32_t map_canon_ace_perms(int snum,
1051                                 enum security_ace_type *pacl_type,
1052                                 mode_t perms,
1053                                 bool directory_ace)
1054 {
1055         uint32_t nt_mask = 0;
1056
1057         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1058
1059         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1060                 if (directory_ace) {
1061                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1062                 } else {
1063                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1064                 }
1065         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1066                 /*
1067                  * Windows NT refuses to display ACEs with no permissions in them (but
1068                  * they are perfectly legal with Windows 2000). If the ACE has empty
1069                  * permissions we cannot use 0, so we use the otherwise unused
1070                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1071                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1072                  * to be changed in the future.
1073                  */
1074
1075                 if (nt4_compatible_acls())
1076                         nt_mask = UNIX_ACCESS_NONE;
1077                 else
1078                         nt_mask = 0;
1079         } else {
1080                 if (directory_ace) {
1081                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1082                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1083                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1084                 } else {
1085                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1086                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1087                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1088                 }
1089         }
1090
1091         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1092                         (unsigned int)perms, (unsigned int)nt_mask ));
1093
1094         return nt_mask;
1095 }
1096
1097 /****************************************************************************
1098  Map NT perms to a UNIX mode_t.
1099 ****************************************************************************/
1100
1101 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
1102 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
1103 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1104
1105 static mode_t map_nt_perms( uint32 *mask, int type)
1106 {
1107         mode_t mode = 0;
1108
1109         switch(type) {
1110         case S_IRUSR:
1111                 if((*mask) & GENERIC_ALL_ACCESS)
1112                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1113                 else {
1114                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1115                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1116                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1117                 }
1118                 break;
1119         case S_IRGRP:
1120                 if((*mask) & GENERIC_ALL_ACCESS)
1121                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1122                 else {
1123                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1124                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1125                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1126                 }
1127                 break;
1128         case S_IROTH:
1129                 if((*mask) & GENERIC_ALL_ACCESS)
1130                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1131                 else {
1132                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1133                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1134                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1135                 }
1136                 break;
1137         }
1138
1139         return mode;
1140 }
1141
1142 /****************************************************************************
1143  Unpack a SEC_DESC into a UNIX owner and group.
1144 ****************************************************************************/
1145
1146 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd)
1147 {
1148         DOM_SID owner_sid;
1149         DOM_SID grp_sid;
1150
1151         *puser = (uid_t)-1;
1152         *pgrp = (gid_t)-1;
1153
1154         if(security_info_sent == 0) {
1155                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1156                 return NT_STATUS_OK;
1157         }
1158
1159         /*
1160          * Validate the owner and group SID's.
1161          */
1162
1163         memset(&owner_sid, '\0', sizeof(owner_sid));
1164         memset(&grp_sid, '\0', sizeof(grp_sid));
1165
1166         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1167
1168         /*
1169          * Don't immediately fail if the owner sid cannot be validated.
1170          * This may be a group chown only set.
1171          */
1172
1173         if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1174                 sid_copy(&owner_sid, psd->owner_sid);
1175                 if (!sid_to_uid(&owner_sid, puser)) {
1176                         if (lp_force_unknown_acl_user(snum)) {
1177                                 /* this allows take ownership to work
1178                                  * reasonably */
1179                                 *puser = current_user.ut.uid;
1180                         } else {
1181                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1182                                          " owner sid for %s\n",
1183                                          sid_string_dbg(&owner_sid)));
1184                                 return NT_STATUS_INVALID_OWNER;
1185                         }
1186                 }
1187                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1188                          (unsigned int)*puser ));
1189         }
1190
1191         /*
1192          * Don't immediately fail if the group sid cannot be validated.
1193          * This may be an owner chown only set.
1194          */
1195
1196         if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1197                 sid_copy(&grp_sid, psd->group_sid);
1198                 if (!sid_to_gid( &grp_sid, pgrp)) {
1199                         if (lp_force_unknown_acl_user(snum)) {
1200                                 /* this allows take group ownership to work
1201                                  * reasonably */
1202                                 *pgrp = current_user.ut.gid;
1203                         } else {
1204                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1205                                          " group sid.\n"));
1206                                 return NT_STATUS_INVALID_OWNER;
1207                         }
1208                 }
1209                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1210                          (unsigned int)*pgrp));
1211         }
1212
1213         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1214
1215         return NT_STATUS_OK;
1216 }
1217
1218 /****************************************************************************
1219  Ensure the enforced permissions for this share apply.
1220 ****************************************************************************/
1221
1222 static void apply_default_perms(const struct share_params *params,
1223                                 const bool is_directory, canon_ace *pace,
1224                                 mode_t type)
1225 {
1226         mode_t and_bits = (mode_t)0;
1227         mode_t or_bits = (mode_t)0;
1228
1229         /* Get the initial bits to apply. */
1230
1231         if (is_directory) {
1232                 and_bits = lp_dir_security_mask(params->service);
1233                 or_bits = lp_force_dir_security_mode(params->service);
1234         } else {
1235                 and_bits = lp_security_mask(params->service);
1236                 or_bits = lp_force_security_mode(params->service);
1237         }
1238
1239         /* Now bounce them into the S_USR space. */
1240         switch(type) {
1241         case S_IRUSR:
1242                 /* Ensure owner has read access. */
1243                 pace->perms |= S_IRUSR;
1244                 if (is_directory)
1245                         pace->perms |= (S_IWUSR|S_IXUSR);
1246                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1247                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1248                 break;
1249         case S_IRGRP:
1250                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1251                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1252                 break;
1253         case S_IROTH:
1254                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1255                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1256                 break;
1257         }
1258
1259         pace->perms = ((pace->perms & and_bits)|or_bits);
1260 }
1261
1262 /****************************************************************************
1263  Check if a given uid/SID is in a group gid/SID. This is probably very
1264  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1265 ****************************************************************************/
1266
1267 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1268 {
1269         const char *u_name = NULL;
1270
1271         /* "Everyone" always matches every uid. */
1272
1273         if (sid_equal(&group_ace->trustee, &global_sid_World))
1274                 return True;
1275
1276         /*
1277          * if it's the current user, we already have the unix token
1278          * and don't need to do the complex user_in_group_sid() call
1279          */
1280         if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1281                 size_t i;
1282
1283                 if (group_ace->unix_ug.gid == current_user.ut.gid) {
1284                         return True;
1285                 }
1286
1287                 for (i=0; i < current_user.ut.ngroups; i++) {
1288                         if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1289                                 return True;
1290                         }
1291                 }
1292         }
1293
1294         /* u_name talloc'ed off tos. */
1295         u_name = uidtoname(uid_ace->unix_ug.uid);
1296         if (!u_name) {
1297                 return False;
1298         }
1299
1300         /*
1301          * user_in_group_sid() uses create_token_from_username()
1302          * which creates an artificial NT token given just a username,
1303          * so this is not reliable for users from foreign domains
1304          * exported by winbindd!
1305          */
1306         return user_in_group_sid(u_name, &group_ace->trustee);
1307 }
1308
1309 /****************************************************************************
1310  A well formed POSIX file or default ACL has at least 3 entries, a
1311  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1312  In addition, the owner must always have at least read access.
1313  When using this call on get_acl, the pst struct is valid and contains
1314  the mode of the file. When using this call on set_acl, the pst struct has
1315  been modified to have a mode containing the default for this file or directory
1316  type.
1317 ****************************************************************************/
1318
1319 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1320                                      const struct share_params *params,
1321                                      const bool is_directory,
1322                                                         const DOM_SID *pfile_owner_sid,
1323                                                         const DOM_SID *pfile_grp_sid,
1324                                                         const SMB_STRUCT_STAT *pst,
1325                                                         bool setting_acl)
1326 {
1327         canon_ace *pace;
1328         bool got_user = False;
1329         bool got_grp = False;
1330         bool got_other = False;
1331         canon_ace *pace_other = NULL;
1332
1333         for (pace = *pp_ace; pace; pace = pace->next) {
1334                 if (pace->type == SMB_ACL_USER_OBJ) {
1335
1336                         if (setting_acl)
1337                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1338                         got_user = True;
1339
1340                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1341
1342                         /*
1343                          * Ensure create mask/force create mode is respected on set.
1344                          */
1345
1346                         if (setting_acl)
1347                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1348                         got_grp = True;
1349
1350                 } else if (pace->type == SMB_ACL_OTHER) {
1351
1352                         /*
1353                          * Ensure create mask/force create mode is respected on set.
1354                          */
1355
1356                         if (setting_acl)
1357                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1358                         got_other = True;
1359                         pace_other = pace;
1360                 }
1361         }
1362
1363         if (!got_user) {
1364                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1365                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1366                         return False;
1367                 }
1368
1369                 ZERO_STRUCTP(pace);
1370                 pace->type = SMB_ACL_USER_OBJ;
1371                 pace->owner_type = UID_ACE;
1372                 pace->unix_ug.uid = pst->st_ex_uid;
1373                 pace->trustee = *pfile_owner_sid;
1374                 pace->attr = ALLOW_ACE;
1375
1376                 if (setting_acl) {
1377                         /* See if the owning user is in any of the other groups in
1378                            the ACE. If so, OR in the permissions from that group. */
1379
1380                         bool group_matched = False;
1381                         canon_ace *pace_iter;
1382
1383                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1384                                 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1385                                         if (uid_entry_in_group(pace, pace_iter)) {
1386                                                 pace->perms |= pace_iter->perms;
1387                                                 group_matched = True;
1388                                         }
1389                                 }
1390                         }
1391
1392                         /* If we only got an "everyone" perm, just use that. */
1393                         if (!group_matched) {
1394                                 if (got_other)
1395                                         pace->perms = pace_other->perms;
1396                                 else
1397                                         pace->perms = 0;
1398                         }
1399
1400                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1401                 } else {
1402                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1403                 }
1404
1405                 DLIST_ADD(*pp_ace, pace);
1406         }
1407
1408         if (!got_grp) {
1409                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1410                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1411                         return False;
1412                 }
1413
1414                 ZERO_STRUCTP(pace);
1415                 pace->type = SMB_ACL_GROUP_OBJ;
1416                 pace->owner_type = GID_ACE;
1417                 pace->unix_ug.uid = pst->st_ex_gid;
1418                 pace->trustee = *pfile_grp_sid;
1419                 pace->attr = ALLOW_ACE;
1420                 if (setting_acl) {
1421                         /* If we only got an "everyone" perm, just use that. */
1422                         if (got_other)
1423                                 pace->perms = pace_other->perms;
1424                         else
1425                                 pace->perms = 0;
1426                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1427                 } else {
1428                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1429                 }
1430
1431                 DLIST_ADD(*pp_ace, pace);
1432         }
1433
1434         if (!got_other) {
1435                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1436                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1437                         return False;
1438                 }
1439
1440                 ZERO_STRUCTP(pace);
1441                 pace->type = SMB_ACL_OTHER;
1442                 pace->owner_type = WORLD_ACE;
1443                 pace->unix_ug.world = -1;
1444                 pace->trustee = global_sid_World;
1445                 pace->attr = ALLOW_ACE;
1446                 if (setting_acl) {
1447                         pace->perms = 0;
1448                         apply_default_perms(params, is_directory, pace, S_IROTH);
1449                 } else
1450                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1451
1452                 DLIST_ADD(*pp_ace, pace);
1453         }
1454
1455         return True;
1456 }
1457
1458 /****************************************************************************
1459  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1460  If it does not have them, check if there are any entries where the trustee is the
1461  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1462 ****************************************************************************/
1463
1464 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1465 {
1466         bool got_user_obj, got_group_obj;
1467         canon_ace *current_ace;
1468         int i, entries;
1469
1470         entries = count_canon_ace_list(ace);
1471         got_user_obj = False;
1472         got_group_obj = False;
1473
1474         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1475                 if (current_ace->type == SMB_ACL_USER_OBJ)
1476                         got_user_obj = True;
1477                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1478                         got_group_obj = True;
1479         }
1480         if (got_user_obj && got_group_obj) {
1481                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1482                 return;
1483         }
1484
1485         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1486                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1487                                 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1488                         current_ace->type = SMB_ACL_USER_OBJ;
1489                         got_user_obj = True;
1490                 }
1491                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1492                                 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1493                         current_ace->type = SMB_ACL_GROUP_OBJ;
1494                         got_group_obj = True;
1495                 }
1496         }
1497         if (!got_user_obj)
1498                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1499         if (!got_group_obj)
1500                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1501 }
1502
1503 /****************************************************************************
1504  Unpack a SEC_DESC into two canonical ace lists.
1505 ****************************************************************************/
1506
1507 static bool create_canon_ace_lists(files_struct *fsp,
1508                                         SMB_STRUCT_STAT *pst,
1509                                         DOM_SID *pfile_owner_sid,
1510                                         DOM_SID *pfile_grp_sid,
1511                                         canon_ace **ppfile_ace,
1512                                         canon_ace **ppdir_ace,
1513                                         const SEC_ACL *dacl)
1514 {
1515         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1516         canon_ace *file_ace = NULL;
1517         canon_ace *dir_ace = NULL;
1518         canon_ace *current_ace = NULL;
1519         bool got_dir_allow = False;
1520         bool got_file_allow = False;
1521         int i, j;
1522
1523         *ppfile_ace = NULL;
1524         *ppdir_ace = NULL;
1525
1526         /*
1527          * Convert the incoming ACL into a more regular form.
1528          */
1529
1530         for(i = 0; i < dacl->num_aces; i++) {
1531                 SEC_ACE *psa = &dacl->aces[i];
1532
1533                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1534                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1535                         return False;
1536                 }
1537
1538                 if (nt4_compatible_acls()) {
1539                         /*
1540                          * The security mask may be UNIX_ACCESS_NONE which should map into
1541                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1542                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1543                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1544                          */
1545
1546                         /*
1547                          * Convert GENERIC bits to specific bits.
1548                          */
1549
1550                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1551
1552                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1553
1554                         if(psa->access_mask != UNIX_ACCESS_NONE)
1555                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1556                 }
1557         }
1558
1559         /*
1560          * Deal with the fact that NT 4.x re-writes the canonical format
1561          * that we return for default ACLs. If a directory ACE is identical
1562          * to a inherited directory ACE then NT changes the bits so that the
1563          * first ACE is set to OI|IO and the second ACE for this SID is set
1564          * to CI. We need to repair this. JRA.
1565          */
1566
1567         for(i = 0; i < dacl->num_aces; i++) {
1568                 SEC_ACE *psa1 = &dacl->aces[i];
1569
1570                 for (j = i + 1; j < dacl->num_aces; j++) {
1571                         SEC_ACE *psa2 = &dacl->aces[j];
1572
1573                         if (psa1->access_mask != psa2->access_mask)
1574                                 continue;
1575
1576                         if (!sid_equal(&psa1->trustee, &psa2->trustee))
1577                                 continue;
1578
1579                         /*
1580                          * Ok - permission bits and SIDs are equal.
1581                          * Check if flags were re-written.
1582                          */
1583
1584                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1585
1586                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1587                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1588
1589                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1590
1591                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1592                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1593
1594                         }
1595                 }
1596         }
1597
1598         for(i = 0; i < dacl->num_aces; i++) {
1599                 SEC_ACE *psa = &dacl->aces[i];
1600
1601                 /*
1602                  * Create a cannon_ace entry representing this NT DACL ACE.
1603                  */
1604
1605                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1606                         free_canon_ace_list(file_ace);
1607                         free_canon_ace_list(dir_ace);
1608                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1609                         return False;
1610                 }
1611
1612                 ZERO_STRUCTP(current_ace);
1613
1614                 sid_copy(&current_ace->trustee, &psa->trustee);
1615
1616                 /*
1617                  * Try and work out if the SID is a user or group
1618                  * as we need to flag these differently for POSIX.
1619                  * Note what kind of a POSIX ACL this should map to.
1620                  */
1621
1622                 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1623                         current_ace->owner_type = WORLD_ACE;
1624                         current_ace->unix_ug.world = -1;
1625                         current_ace->type = SMB_ACL_OTHER;
1626                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1627                         current_ace->owner_type = UID_ACE;
1628                         current_ace->unix_ug.uid = pst->st_ex_uid;
1629                         current_ace->type = SMB_ACL_USER_OBJ;
1630
1631                         /*
1632                          * The Creator Owner entry only specifies inheritable permissions,
1633                          * never access permissions. WinNT doesn't always set the ACE to
1634                          *INHERIT_ONLY, though.
1635                          */
1636
1637                         if (nt4_compatible_acls())
1638                                 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1639                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1640                         current_ace->owner_type = GID_ACE;
1641                         current_ace->unix_ug.gid = pst->st_ex_gid;
1642                         current_ace->type = SMB_ACL_GROUP_OBJ;
1643
1644                         /*
1645                          * The Creator Group entry only specifies inheritable permissions,
1646                          * never access permissions. WinNT doesn't always set the ACE to
1647                          *INHERIT_ONLY, though.
1648                          */
1649                         if (nt4_compatible_acls())
1650                                 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1651
1652                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1653                         current_ace->owner_type = UID_ACE;
1654                         /* If it's the owning user, this is a user_obj, not
1655                          * a user. */
1656                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1657                                 current_ace->type = SMB_ACL_USER_OBJ;
1658                         } else {
1659                                 current_ace->type = SMB_ACL_USER;
1660                         }
1661                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1662                         current_ace->owner_type = GID_ACE;
1663                         /* If it's the primary group, this is a group_obj, not
1664                          * a group. */
1665                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1666                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1667                         } else {
1668                                 current_ace->type = SMB_ACL_GROUP;
1669                         }
1670                 } else {
1671                         /*
1672                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1673                          */
1674
1675                         if (non_mappable_sid(&psa->trustee)) {
1676                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1677                                            "non-mappable SID %s\n",
1678                                            sid_string_dbg(&psa->trustee)));
1679                                 SAFE_FREE(current_ace);
1680                                 continue;
1681                         }
1682
1683                         free_canon_ace_list(file_ace);
1684                         free_canon_ace_list(dir_ace);
1685                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1686                                   "%s to uid or gid.\n",
1687                                   sid_string_dbg(&current_ace->trustee)));
1688                         SAFE_FREE(current_ace);
1689                         return False;
1690                 }
1691
1692                 /*
1693                  * Map the given NT permissions into a UNIX mode_t containing only
1694                  * S_I(R|W|X)USR bits.
1695                  */
1696
1697                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1698                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1699
1700                 /* Store the ace_flag. */
1701                 current_ace->ace_flags = psa->flags;
1702
1703                 /*
1704                  * Now add the created ace to either the file list, the directory
1705                  * list, or both. We *MUST* preserve the order here (hence we use
1706                  * DLIST_ADD_END) as NT ACLs are order dependent.
1707                  */
1708
1709                 if (fsp->is_directory) {
1710
1711                         /*
1712                          * We can only add to the default POSIX ACE list if the ACE is
1713                          * designed to be inherited by both files and directories.
1714                          */
1715
1716                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1717                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1718
1719                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1720
1721                                 /*
1722                                  * Note if this was an allow ace. We can't process
1723                                  * any further deny ace's after this.
1724                                  */
1725
1726                                 if (current_ace->attr == ALLOW_ACE)
1727                                         got_dir_allow = True;
1728
1729                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1730                                         DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1731 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1732                                         free_canon_ace_list(file_ace);
1733                                         free_canon_ace_list(dir_ace);
1734                                         return False;
1735                                 }
1736
1737                                 if( DEBUGLVL( 10 )) {
1738                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1739                                         print_canon_ace( current_ace, 0);
1740                                 }
1741
1742                                 /*
1743                                  * If this is not an inherit only ACE we need to add a duplicate
1744                                  * to the file acl.
1745                                  */
1746
1747                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1748                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1749
1750                                         if (!dup_ace) {
1751                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1752                                                 free_canon_ace_list(file_ace);
1753                                                 free_canon_ace_list(dir_ace);
1754                                                 return False;
1755                                         }
1756
1757                                         /*
1758                                          * We must not free current_ace here as its
1759                                          * pointer is now owned by the dir_ace list.
1760                                          */
1761                                         current_ace = dup_ace;
1762                                 } else {
1763                                         /*
1764                                          * We must not free current_ace here as its
1765                                          * pointer is now owned by the dir_ace list.
1766                                          */
1767                                         current_ace = NULL;
1768                                 }
1769                         }
1770                 }
1771
1772                 /*
1773                  * Only add to the file ACL if not inherit only.
1774                  */
1775
1776                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1777                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1778
1779                         /*
1780                          * Note if this was an allow ace. We can't process
1781                          * any further deny ace's after this.
1782                          */
1783
1784                         if (current_ace->attr == ALLOW_ACE)
1785                                 got_file_allow = True;
1786
1787                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1788                                 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1789 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1790                                 free_canon_ace_list(file_ace);
1791                                 free_canon_ace_list(dir_ace);
1792                                 return False;
1793                         }
1794
1795                         if( DEBUGLVL( 10 )) {
1796                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1797                                 print_canon_ace( current_ace, 0);
1798                         }
1799                         all_aces_are_inherit_only = False;
1800                         /*
1801                          * We must not free current_ace here as its
1802                          * pointer is now owned by the file_ace list.
1803                          */
1804                         current_ace = NULL;
1805                 }
1806
1807                 /*
1808                  * Free if ACE was not added.
1809                  */
1810
1811                 SAFE_FREE(current_ace);
1812         }
1813
1814         if (fsp->is_directory && all_aces_are_inherit_only) {
1815                 /*
1816                  * Windows 2000 is doing one of these weird 'inherit acl'
1817                  * traverses to conserve NTFS ACL resources. Just pretend
1818                  * there was no DACL sent. JRA.
1819                  */
1820
1821                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1822                 free_canon_ace_list(file_ace);
1823                 free_canon_ace_list(dir_ace);
1824                 file_ace = NULL;
1825                 dir_ace = NULL;
1826         } else {
1827                 /*
1828                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1829                  * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1830                  * entries can be converted to *_OBJ. Usually we will already have these
1831                  * entries in the Default ACL, and the Access ACL will not have them.
1832                  */
1833                 if (file_ace) {
1834                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1835                 }
1836                 if (dir_ace) {
1837                         check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1838                 }
1839         }
1840
1841         *ppfile_ace = file_ace;
1842         *ppdir_ace = dir_ace;
1843
1844         return True;
1845 }
1846
1847 /****************************************************************************
1848  ASCII art time again... JRA :-).
1849
1850  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1851  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1852  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1853  allow or deny have been merged, so the same SID can only appear once in the deny
1854  list or once in the allow list.
1855
1856  We then process as follows :
1857
1858  ---------------------------------------------------------------------------
1859  First pass - look for a Everyone DENY entry.
1860
1861  If it is deny all (rwx) trunate the list at this point.
1862  Else, walk the list from this point and use the deny permissions of this
1863  entry as a mask on all following allow entries. Finally, delete
1864  the Everyone DENY entry (we have applied it to everything possible).
1865
1866  In addition, in this pass we remove any DENY entries that have
1867  no permissions (ie. they are a DENY nothing).
1868  ---------------------------------------------------------------------------
1869  Second pass - only deal with deny user entries.
1870
1871  DENY user1 (perms XXX)
1872
1873  new_perms = 0
1874  for all following allow group entries where user1 is in group
1875         new_perms |= group_perms;
1876
1877  user1 entry perms = new_perms & ~ XXX;
1878
1879  Convert the deny entry to an allow entry with the new perms and
1880  push to the end of the list. Note if the user was in no groups
1881  this maps to a specific allow nothing entry for this user.
1882
1883  The common case from the NT ACL choser (userX deny all) is
1884  optimised so we don't do the group lookup - we just map to
1885  an allow nothing entry.
1886
1887  What we're doing here is inferring the allow permissions the
1888  person setting the ACE on user1 wanted by looking at the allow
1889  permissions on the groups the user is currently in. This will
1890  be a snapshot, depending on group membership but is the best
1891  we can do and has the advantage of failing closed rather than
1892  open.
1893  ---------------------------------------------------------------------------
1894  Third pass - only deal with deny group entries.
1895
1896  DENY group1 (perms XXX)
1897
1898  for all following allow user entries where user is in group1
1899    user entry perms = user entry perms & ~ XXX;
1900
1901  If there is a group Everyone allow entry with permissions YYY,
1902  convert the group1 entry to an allow entry and modify its
1903  permissions to be :
1904
1905  new_perms = YYY & ~ XXX
1906
1907  and push to the end of the list.
1908
1909  If there is no group Everyone allow entry then convert the
1910  group1 entry to a allow nothing entry and push to the end of the list.
1911
1912  Note that the common case from the NT ACL choser (groupX deny all)
1913  cannot be optimised here as we need to modify user entries who are
1914  in the group to change them to a deny all also.
1915
1916  What we're doing here is modifying the allow permissions of
1917  user entries (which are more specific in POSIX ACLs) to mask
1918  out the explicit deny set on the group they are in. This will
1919  be a snapshot depending on current group membership but is the
1920  best we can do and has the advantage of failing closed rather
1921  than open.
1922  ---------------------------------------------------------------------------
1923  Fourth pass - cope with cumulative permissions.
1924
1925  for all allow user entries, if there exists an allow group entry with
1926  more permissive permissions, and the user is in that group, rewrite the
1927  allow user permissions to contain both sets of permissions.
1928
1929  Currently the code for this is #ifdef'ed out as these semantics make
1930  no sense to me. JRA.
1931  ---------------------------------------------------------------------------
1932
1933  Note we *MUST* do the deny user pass first as this will convert deny user
1934  entries into allow user entries which can then be processed by the deny
1935  group pass.
1936
1937  The above algorithm took a *lot* of thinking about - hence this
1938  explaination :-). JRA.
1939 ****************************************************************************/
1940
1941 /****************************************************************************
1942  Process a canon_ace list entries. This is very complex code. We need
1943  to go through and remove the "deny" permissions from any allow entry that matches
1944  the id of this entry. We have already refused any NT ACL that wasn't in correct
1945  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1946  we just remove it (to fail safe). We have already removed any duplicate ace
1947  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1948  allow entries.
1949 ****************************************************************************/
1950
1951 static void process_deny_list( canon_ace **pp_ace_list )
1952 {
1953         canon_ace *ace_list = *pp_ace_list;
1954         canon_ace *curr_ace = NULL;
1955         canon_ace *curr_ace_next = NULL;
1956
1957         /* Pass 1 above - look for an Everyone, deny entry. */
1958
1959         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1960                 canon_ace *allow_ace_p;
1961
1962                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1963
1964                 if (curr_ace->attr != DENY_ACE)
1965                         continue;
1966
1967                 if (curr_ace->perms == (mode_t)0) {
1968
1969                         /* Deny nothing entry - delete. */
1970
1971                         DLIST_REMOVE(ace_list, curr_ace);
1972                         continue;
1973                 }
1974
1975                 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1976                         continue;
1977
1978                 /* JRATEST - assert. */
1979                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1980
1981                 if (curr_ace->perms == ALL_ACE_PERMS) {
1982
1983                         /*
1984                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1985                          * list at this point including this entry.
1986                          */
1987
1988                         canon_ace *prev_entry = curr_ace->prev;
1989
1990                         free_canon_ace_list( curr_ace );
1991                         if (prev_entry)
1992                                 prev_entry->next = NULL;
1993                         else {
1994                                 /* We deleted the entire list. */
1995                                 ace_list = NULL;
1996                         }
1997                         break;
1998                 }
1999
2000                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2001
2002                         /*
2003                          * Only mask off allow entries.
2004                          */
2005
2006                         if (allow_ace_p->attr != ALLOW_ACE)
2007                                 continue;
2008
2009                         allow_ace_p->perms &= ~curr_ace->perms;
2010                 }
2011
2012                 /*
2013                  * Now it's been applied, remove it.
2014                  */
2015
2016                 DLIST_REMOVE(ace_list, curr_ace);
2017         }
2018
2019         /* Pass 2 above - deal with deny user entries. */
2020
2021         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2022                 mode_t new_perms = (mode_t)0;
2023                 canon_ace *allow_ace_p;
2024
2025                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2026
2027                 if (curr_ace->attr != DENY_ACE)
2028                         continue;
2029
2030                 if (curr_ace->owner_type != UID_ACE)
2031                         continue;
2032
2033                 if (curr_ace->perms == ALL_ACE_PERMS) {
2034
2035                         /*
2036                          * Optimisation - this is a deny everything to this user.
2037                          * Convert to an allow nothing and push to the end of the list.
2038                          */
2039
2040                         curr_ace->attr = ALLOW_ACE;
2041                         curr_ace->perms = (mode_t)0;
2042                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2043                         continue;
2044                 }
2045
2046                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2047
2048                         if (allow_ace_p->attr != ALLOW_ACE)
2049                                 continue;
2050
2051                         /* We process GID_ACE and WORLD_ACE entries only. */
2052
2053                         if (allow_ace_p->owner_type == UID_ACE)
2054                                 continue;
2055
2056                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2057                                 new_perms |= allow_ace_p->perms;
2058                 }
2059
2060                 /*
2061                  * Convert to a allow entry, modify the perms and push to the end
2062                  * of the list.
2063                  */
2064
2065                 curr_ace->attr = ALLOW_ACE;
2066                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2067                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2068         }
2069
2070         /* Pass 3 above - deal with deny group entries. */
2071
2072         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2073                 canon_ace *allow_ace_p;
2074                 canon_ace *allow_everyone_p = NULL;
2075
2076                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2077
2078                 if (curr_ace->attr != DENY_ACE)
2079                         continue;
2080
2081                 if (curr_ace->owner_type != GID_ACE)
2082                         continue;
2083
2084                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2085
2086                         if (allow_ace_p->attr != ALLOW_ACE)
2087                                 continue;
2088
2089                         /* Store a pointer to the Everyone allow, if it exists. */
2090                         if (allow_ace_p->owner_type == WORLD_ACE)
2091                                 allow_everyone_p = allow_ace_p;
2092
2093                         /* We process UID_ACE entries only. */
2094
2095                         if (allow_ace_p->owner_type != UID_ACE)
2096                                 continue;
2097
2098                         /* Mask off the deny group perms. */
2099
2100                         if (uid_entry_in_group( allow_ace_p, curr_ace))
2101                                 allow_ace_p->perms &= ~curr_ace->perms;
2102                 }
2103
2104                 /*
2105                  * Convert the deny to an allow with the correct perms and
2106                  * push to the end of the list.
2107                  */
2108
2109                 curr_ace->attr = ALLOW_ACE;
2110                 if (allow_everyone_p)
2111                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2112                 else
2113                         curr_ace->perms = (mode_t)0;
2114                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2115         }
2116
2117         /* Doing this fourth pass allows Windows semantics to be layered
2118          * on top of POSIX semantics. I'm not sure if this is desirable.
2119          * For example, in W2K ACLs there is no way to say, "Group X no
2120          * access, user Y full access" if user Y is a member of group X.
2121          * This seems completely broken semantics to me.... JRA.
2122          */
2123
2124 #if 0
2125         /* Pass 4 above - deal with allow entries. */
2126
2127         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2128                 canon_ace *allow_ace_p;
2129
2130                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2131
2132                 if (curr_ace->attr != ALLOW_ACE)
2133                         continue;
2134
2135                 if (curr_ace->owner_type != UID_ACE)
2136                         continue;
2137
2138                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2139
2140                         if (allow_ace_p->attr != ALLOW_ACE)
2141                                 continue;
2142
2143                         /* We process GID_ACE entries only. */
2144
2145                         if (allow_ace_p->owner_type != GID_ACE)
2146                                 continue;
2147
2148                         /* OR in the group perms. */
2149
2150                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2151                                 curr_ace->perms |= allow_ace_p->perms;
2152                 }
2153         }
2154 #endif
2155
2156         *pp_ace_list = ace_list;
2157 }
2158
2159 /****************************************************************************
2160  Create a default mode that will be used if a security descriptor entry has
2161  no user/group/world entries.
2162 ****************************************************************************/
2163
2164 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2165 {
2166         int snum = SNUM(fsp->conn);
2167         mode_t and_bits = (mode_t)0;
2168         mode_t or_bits = (mode_t)0;
2169         mode_t mode;
2170
2171         if (interitable_mode) {
2172                 struct smb_filename *smb_fname = NULL;
2173                 NTSTATUS status;
2174
2175                 status = create_synthetic_smb_fname_split(talloc_tos(),
2176                                                           fsp->fsp_name, NULL,
2177                                                           &smb_fname);
2178                 if (!NT_STATUS_IS_OK(status)) {
2179                         return 0;
2180                 }
2181                 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE, smb_fname,
2182                                  NULL);
2183         } else {
2184                 mode = S_IRUSR;
2185         }
2186
2187         if (fsp->is_directory)
2188                 mode |= (S_IWUSR|S_IXUSR);
2189
2190         /*
2191          * Now AND with the create mode/directory mode bits then OR with the
2192          * force create mode/force directory mode bits.
2193          */
2194
2195         if (fsp->is_directory) {
2196                 and_bits = lp_dir_security_mask(snum);
2197                 or_bits = lp_force_dir_security_mode(snum);
2198         } else {
2199                 and_bits = lp_security_mask(snum);
2200                 or_bits = lp_force_security_mode(snum);
2201         }
2202
2203         return ((mode & and_bits)|or_bits);
2204 }
2205
2206 /****************************************************************************
2207  Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2208  succeeding.
2209 ****************************************************************************/
2210
2211 static bool unpack_canon_ace(files_struct *fsp,
2212                                 SMB_STRUCT_STAT *pst,
2213                                 DOM_SID *pfile_owner_sid,
2214                                 DOM_SID *pfile_grp_sid,
2215                                 canon_ace **ppfile_ace,
2216                                 canon_ace **ppdir_ace,
2217                                 uint32 security_info_sent,
2218                                 const SEC_DESC *psd)
2219 {
2220         canon_ace *file_ace = NULL;
2221         canon_ace *dir_ace = NULL;
2222
2223         *ppfile_ace = NULL;
2224         *ppdir_ace = NULL;
2225
2226         if(security_info_sent == 0) {
2227                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2228                 return False;
2229         }
2230
2231         /*
2232          * If no DACL then this is a chown only security descriptor.
2233          */
2234
2235         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2236                 return True;
2237
2238         /*
2239          * Now go through the DACL and create the canon_ace lists.
2240          */
2241
2242         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2243                                                                 &file_ace, &dir_ace, psd->dacl))
2244                 return False;
2245
2246         if ((file_ace == NULL) && (dir_ace == NULL)) {
2247                 /* W2K traverse DACL set - ignore. */
2248                 return True;
2249         }
2250
2251         /*
2252          * Go through the canon_ace list and merge entries
2253          * belonging to identical users of identical allow or deny type.
2254          * We can do this as all deny entries come first, followed by
2255          * all allow entries (we have mandated this before accepting this acl).
2256          */
2257
2258         print_canon_ace_list( "file ace - before merge", file_ace);
2259         merge_aces( &file_ace );
2260
2261         print_canon_ace_list( "dir ace - before merge", dir_ace);
2262         merge_aces( &dir_ace );
2263
2264         /*
2265          * NT ACLs are order dependent. Go through the acl lists and
2266          * process DENY entries by masking the allow entries.
2267          */
2268
2269         print_canon_ace_list( "file ace - before deny", file_ace);
2270         process_deny_list( &file_ace);
2271
2272         print_canon_ace_list( "dir ace - before deny", dir_ace);
2273         process_deny_list( &dir_ace);
2274
2275         /*
2276          * A well formed POSIX file or default ACL has at least 3 entries, a
2277          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2278          * and optionally a mask entry. Ensure this is the case.
2279          */
2280
2281         print_canon_ace_list( "file ace - before valid", file_ace);
2282
2283         /*
2284          * A default 3 element mode entry for a file should be r-- --- ---.
2285          * A default 3 element mode entry for a directory should be rwx --- ---.
2286          */
2287
2288         pst->st_ex_mode = create_default_mode(fsp, False);
2289
2290         if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2291                 free_canon_ace_list(file_ace);
2292                 free_canon_ace_list(dir_ace);
2293                 return False;
2294         }
2295
2296         print_canon_ace_list( "dir ace - before valid", dir_ace);
2297
2298         /*
2299          * A default inheritable 3 element mode entry for a directory should be the
2300          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2301          * it's a directory.
2302          */
2303
2304         pst->st_ex_mode = create_default_mode(fsp, True);
2305
2306         if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2307                 free_canon_ace_list(file_ace);
2308                 free_canon_ace_list(dir_ace);
2309                 return False;
2310         }
2311
2312         print_canon_ace_list( "file ace - return", file_ace);
2313         print_canon_ace_list( "dir ace - return", dir_ace);
2314
2315         *ppfile_ace = file_ace;
2316         *ppdir_ace = dir_ace;
2317         return True;
2318
2319 }
2320
2321 /******************************************************************************
2322  When returning permissions, try and fit NT display
2323  semantics if possible. Note the the canon_entries here must have been malloced.
2324  The list format should be - first entry = owner, followed by group and other user
2325  entries, last entry = other.
2326
2327  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2328  are not ordered, and match on the most specific entry rather than walking a list,
2329  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2330
2331  Entry 0: owner : deny all except read and write.
2332  Entry 1: owner : allow read and write.
2333  Entry 2: group : deny all except read.
2334  Entry 3: group : allow read.
2335  Entry 4: Everyone : allow read.
2336
2337  But NT cannot display this in their ACL editor !
2338 ********************************************************************************/
2339
2340 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2341 {
2342         canon_ace *l_head = *pp_list_head;
2343         canon_ace *owner_ace = NULL;
2344         canon_ace *other_ace = NULL;
2345         canon_ace *ace = NULL;
2346
2347         for (ace = l_head; ace; ace = ace->next) {
2348                 if (ace->type == SMB_ACL_USER_OBJ)
2349                         owner_ace = ace;
2350                 else if (ace->type == SMB_ACL_OTHER) {
2351                         /* Last ace - this is "other" */
2352                         other_ace = ace;
2353                 }
2354         }
2355
2356         if (!owner_ace || !other_ace) {
2357                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2358                         filename ));
2359                 return;
2360         }
2361
2362         /*
2363          * The POSIX algorithm applies to owner first, and other last,
2364          * so ensure they are arranged in this order.
2365          */
2366
2367         if (owner_ace) {
2368                 DLIST_PROMOTE(l_head, owner_ace);
2369         }
2370
2371         if (other_ace) {
2372                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2373         }
2374
2375         /* We have probably changed the head of the list. */
2376
2377         *pp_list_head = l_head;
2378 }
2379
2380 /****************************************************************************
2381  Create a linked list of canonical ACE entries.
2382 ****************************************************************************/
2383
2384 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2385                                    const char *fname, SMB_ACL_T posix_acl,
2386                                    const SMB_STRUCT_STAT *psbuf,
2387                                    const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2388 {
2389         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2390         canon_ace *l_head = NULL;
2391         canon_ace *ace = NULL;
2392         canon_ace *next_ace = NULL;
2393         int entry_id = SMB_ACL_FIRST_ENTRY;
2394         SMB_ACL_ENTRY_T entry;
2395         size_t ace_count;
2396
2397         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2398                 SMB_ACL_TAG_T tagtype;
2399                 SMB_ACL_PERMSET_T permset;
2400                 DOM_SID sid;
2401                 posix_id unix_ug;
2402                 enum ace_owner owner_type;
2403
2404                 entry_id = SMB_ACL_NEXT_ENTRY;
2405
2406                 /* Is this a MASK entry ? */
2407                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2408                         continue;
2409
2410                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2411                         continue;
2412
2413                 /* Decide which SID to use based on the ACL type. */
2414                 switch(tagtype) {
2415                         case SMB_ACL_USER_OBJ:
2416                                 /* Get the SID from the owner. */
2417                                 sid_copy(&sid, powner);
2418                                 unix_ug.uid = psbuf->st_ex_uid;
2419                                 owner_type = UID_ACE;
2420                                 break;
2421                         case SMB_ACL_USER:
2422                                 {
2423                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2424                                         if (puid == NULL) {
2425                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2426                                                 continue;
2427                                         }
2428                                         /*
2429                                          * A SMB_ACL_USER entry for the owner is shadowed by the
2430                                          * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2431                                          * that entry, so we ignore it. We also don't create such
2432                                          * entries out of the blue when setting ACLs, so a get/set
2433                                          * cycle will drop them.
2434                                          */
2435                                         if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_ex_uid) {
2436                                                 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2437                                                 continue;
2438                                         }
2439                                         uid_to_sid( &sid, *puid);
2440                                         unix_ug.uid = *puid;
2441                                         owner_type = UID_ACE;
2442                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2443                                         break;
2444                                 }
2445                         case SMB_ACL_GROUP_OBJ:
2446                                 /* Get the SID from the owning group. */
2447                                 sid_copy(&sid, pgroup);
2448                                 unix_ug.gid = psbuf->st_ex_gid;
2449                                 owner_type = GID_ACE;
2450                                 break;
2451                         case SMB_ACL_GROUP:
2452                                 {
2453                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2454                                         if (pgid == NULL) {
2455                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2456                                                 continue;
2457                                         }
2458                                         gid_to_sid( &sid, *pgid);
2459                                         unix_ug.gid = *pgid;
2460                                         owner_type = GID_ACE;
2461                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2462                                         break;
2463                                 }
2464                         case SMB_ACL_MASK:
2465                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2466                                 continue; /* Don't count the mask as an entry. */
2467                         case SMB_ACL_OTHER:
2468                                 /* Use the Everyone SID */
2469                                 sid = global_sid_World;
2470                                 unix_ug.world = -1;
2471                                 owner_type = WORLD_ACE;
2472                                 break;
2473                         default:
2474                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2475                                 continue;
2476                 }
2477
2478                 /*
2479                  * Add this entry to the list.
2480                  */
2481
2482                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2483                         goto fail;
2484
2485                 ZERO_STRUCTP(ace);
2486                 ace->type = tagtype;
2487                 ace->perms = convert_permset_to_mode_t(conn, permset);
2488                 ace->attr = ALLOW_ACE;
2489                 ace->trustee = sid;
2490                 ace->unix_ug = unix_ug;
2491                 ace->owner_type = owner_type;
2492                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2493
2494                 DLIST_ADD(l_head, ace);
2495         }
2496
2497         /*
2498          * This next call will ensure we have at least a user/group/world set.
2499          */
2500
2501         if (!ensure_canon_entry_valid(&l_head, conn->params,
2502                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2503                                       psbuf, False))
2504                 goto fail;
2505
2506         /*
2507          * Now go through the list, masking the permissions with the
2508          * acl_mask. Ensure all DENY Entries are at the start of the list.
2509          */
2510
2511         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2512
2513         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2514                 next_ace = ace->next;
2515
2516                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2517                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2518                         ace->perms &= acl_mask;
2519
2520                 if (ace->perms == 0) {
2521                         DLIST_PROMOTE(l_head, ace);
2522                 }
2523
2524                 if( DEBUGLVL( 10 ) ) {
2525                         print_canon_ace(ace, ace_count);
2526                 }
2527         }
2528
2529         arrange_posix_perms(fname,&l_head );
2530
2531         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2532
2533         return l_head;
2534
2535   fail:
2536
2537         free_canon_ace_list(l_head);
2538         return NULL;
2539 }
2540
2541 /****************************************************************************
2542  Check if the current user group list contains a given group.
2543 ****************************************************************************/
2544
2545 static bool current_user_in_group(gid_t gid)
2546 {
2547         int i;
2548
2549         for (i = 0; i < current_user.ut.ngroups; i++) {
2550                 if (current_user.ut.groups[i] == gid) {
2551                         return True;
2552                 }
2553         }
2554
2555         return False;
2556 }
2557
2558 /****************************************************************************
2559  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2560 ****************************************************************************/
2561
2562 static bool acl_group_override(connection_struct *conn,
2563                                 const SMB_STRUCT_STAT *psbuf,
2564                                 const char *fname)
2565 {
2566         struct smb_filename *smb_fname = NULL;
2567         NTSTATUS status;
2568
2569         if ((errno != EPERM) && (errno != EACCES)) {
2570                 return false;
2571         }
2572
2573         /* file primary group == user primary or supplementary group */
2574         if (lp_acl_group_control(SNUM(conn)) &&
2575                         current_user_in_group(psbuf->st_ex_gid)) {
2576                 return true;
2577         }
2578
2579         status = create_synthetic_smb_fname_split(talloc_tos(), fname, psbuf,
2580                                                   &smb_fname);
2581
2582         if (!NT_STATUS_IS_OK(status)) {
2583                 return false;
2584         }
2585
2586         /* user has writeable permission */
2587         if (lp_dos_filemode(SNUM(conn)) &&
2588             can_write_to_file(conn, smb_fname)) {
2589                 TALLOC_FREE(smb_fname);
2590                 return true;
2591         }
2592         TALLOC_FREE(smb_fname);
2593
2594         return false;
2595 }
2596
2597 /****************************************************************************
2598  Attempt to apply an ACL to a file or directory.
2599 ****************************************************************************/
2600
2601 static bool set_canon_ace_list(files_struct *fsp,
2602                                 canon_ace *the_ace,
2603                                 bool default_ace,
2604                                 const SMB_STRUCT_STAT *psbuf,
2605                                 bool *pacl_set_support)
2606 {
2607         connection_struct *conn = fsp->conn;
2608         bool ret = False;
2609         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2610         canon_ace *p_ace;
2611         int i;
2612         SMB_ACL_ENTRY_T mask_entry;
2613         bool got_mask_entry = False;
2614         SMB_ACL_PERMSET_T mask_permset;
2615         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2616         bool needs_mask = False;
2617         mode_t mask_perms = 0;
2618
2619 #if defined(POSIX_ACL_NEEDS_MASK)
2620         /* HP-UX always wants to have a mask (called "class" there). */
2621         needs_mask = True;
2622 #endif
2623
2624         if (the_acl == NULL) {
2625
2626                 if (!no_acl_syscall_error(errno)) {
2627                         /*
2628                          * Only print this error message if we have some kind of ACL
2629                          * support that's not working. Otherwise we would always get this.
2630                          */
2631                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2632                                 default_ace ? "default" : "file", strerror(errno) ));
2633                 }
2634                 *pacl_set_support = False;
2635                 return False;
2636         }
2637
2638         if( DEBUGLVL( 10 )) {
2639                 dbgtext("set_canon_ace_list: setting ACL:\n");
2640                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2641                         print_canon_ace( p_ace, i);
2642                 }
2643         }
2644
2645         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2646                 SMB_ACL_ENTRY_T the_entry;
2647                 SMB_ACL_PERMSET_T the_permset;
2648
2649                 /*
2650                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2651                  * named group entries. But if there is an ACL_MASK entry, it applies
2652                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2653                  * so that it doesn't deny (i.e., mask off) any permissions.
2654                  */
2655
2656                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2657                         needs_mask = True;
2658                         mask_perms |= p_ace->perms;
2659                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2660                         mask_perms |= p_ace->perms;
2661                 }
2662
2663                 /*
2664                  * Get the entry for this ACE.
2665                  */
2666
2667                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2668                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2669                                 i, strerror(errno) ));
2670                         goto fail;
2671                 }
2672
2673                 if (p_ace->type == SMB_ACL_MASK) {
2674                         mask_entry = the_entry;
2675                         got_mask_entry = True;
2676                 }
2677
2678                 /*
2679                  * Ok - we now know the ACL calls should be working, don't
2680                  * allow fallback to chmod.
2681                  */
2682
2683                 *pacl_set_support = True;
2684
2685                 /*
2686                  * Initialise the entry from the canon_ace.
2687                  */
2688
2689                 /*
2690                  * First tell the entry what type of ACE this is.
2691                  */
2692
2693                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2694                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2695                                 i, strerror(errno) ));
2696                         goto fail;
2697                 }
2698
2699                 /*
2700                  * Only set the qualifier (user or group id) if the entry is a user
2701                  * or group id ACE.
2702                  */
2703
2704                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2705                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2706                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2707                                         i, strerror(errno) ));
2708                                 goto fail;
2709                         }
2710                 }
2711
2712                 /*
2713                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2714                  */
2715
2716                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2717                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2718                                 i, strerror(errno) ));
2719                         goto fail;
2720                 }
2721
2722                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2723                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2724                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2725                         goto fail;
2726                 }
2727
2728                 /*
2729                  * ..and apply them to the entry.
2730                  */
2731
2732                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2733                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2734                                 i, strerror(errno) ));
2735                         goto fail;
2736                 }
2737
2738                 if( DEBUGLVL( 10 ))
2739                         print_canon_ace( p_ace, i);
2740
2741         }
2742
2743         if (needs_mask && !got_mask_entry) {
2744                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2745                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2746                         goto fail;
2747                 }
2748
2749                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2750                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2751                         goto fail;
2752                 }
2753
2754                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2755                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2756                         goto fail;
2757                 }
2758
2759                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2760                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2761                         goto fail;
2762                 }
2763
2764                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2765                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2766                         goto fail;
2767                 }
2768         }
2769
2770         /*
2771          * Finally apply it to the file or directory.
2772          */
2773
2774         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2775                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2776                         /*
2777                          * Some systems allow all the above calls and only fail with no ACL support
2778                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2779                          */
2780                         if (no_acl_syscall_error(errno)) {
2781                                 *pacl_set_support = False;
2782                         }
2783
2784                         if (acl_group_override(conn, psbuf, fsp->fsp_name)) {
2785                                 int sret;
2786
2787                                 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2788                                         fsp->fsp_name ));
2789
2790                                 become_root();
2791                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl);
2792                                 unbecome_root();
2793                                 if (sret == 0) {
2794                                         ret = True;
2795                                 }
2796                         }
2797
2798                         if (ret == False) {
2799                                 DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2800                                                 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2801                                                 fsp->fsp_name, strerror(errno) ));
2802                                 goto fail;
2803                         }
2804                 }
2805         } else {
2806                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2807                         /*
2808                          * Some systems allow all the above calls and only fail with no ACL support
2809                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2810                          */
2811                         if (no_acl_syscall_error(errno)) {
2812                                 *pacl_set_support = False;
2813                         }
2814
2815                         if (acl_group_override(conn, psbuf, fsp->fsp_name)) {
2816                                 int sret;
2817
2818                                 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2819                                         fsp->fsp_name ));
2820
2821                                 become_root();
2822                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2823                                 unbecome_root();
2824                                 if (sret == 0) {
2825                                         ret = True;
2826                                 }
2827                         }
2828
2829                         if (ret == False) {
2830                                 DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2831                                                 fsp->fsp_name, strerror(errno) ));
2832                                 goto fail;
2833                         }
2834                 }
2835         }
2836
2837         ret = True;
2838
2839   fail:
2840
2841         if (the_acl != NULL) {
2842                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2843         }
2844
2845         return ret;
2846 }
2847
2848 /****************************************************************************
2849  Find a particular canon_ace entry.
2850 ****************************************************************************/
2851
2852 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2853 {
2854         while (list) {
2855                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2856                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2857                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2858                         break;
2859                 list = list->next;
2860         }
2861         return list;
2862 }
2863
2864 /****************************************************************************
2865
2866 ****************************************************************************/
2867
2868 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2869 {
2870         SMB_ACL_ENTRY_T entry;
2871
2872         if (!the_acl)
2873                 return NULL;
2874         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2875                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2876                 return NULL;
2877         }
2878         return the_acl;
2879 }
2880
2881 /****************************************************************************
2882  Convert a canon_ace to a generic 3 element permission - if possible.
2883 ****************************************************************************/
2884
2885 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2886
2887 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2888 {
2889         int snum = SNUM(fsp->conn);
2890         size_t ace_count = count_canon_ace_list(file_ace_list);
2891         canon_ace *ace_p;
2892         canon_ace *owner_ace = NULL;
2893         canon_ace *group_ace = NULL;
2894         canon_ace *other_ace = NULL;
2895         mode_t and_bits;
2896         mode_t or_bits;
2897
2898         if (ace_count != 3) {
2899                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2900 posix perms.\n", fsp->fsp_name ));
2901                 return False;
2902         }
2903
2904         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2905                 if (ace_p->owner_type == UID_ACE)
2906                         owner_ace = ace_p;
2907                 else if (ace_p->owner_type == GID_ACE)
2908                         group_ace = ace_p;
2909                 else if (ace_p->owner_type == WORLD_ACE)
2910                         other_ace = ace_p;
2911         }
2912
2913         if (!owner_ace || !group_ace || !other_ace) {
2914                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2915                                 fsp->fsp_name ));
2916                 return False;
2917         }
2918
2919         *posix_perms = (mode_t)0;
2920
2921         *posix_perms |= owner_ace->perms;
2922         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2923         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2924         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2925         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2926         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2927         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2928
2929         /* The owner must have at least read access. */
2930
2931         *posix_perms |= S_IRUSR;
2932         if (fsp->is_directory)
2933                 *posix_perms |= (S_IWUSR|S_IXUSR);
2934
2935         /* If requested apply the masks. */
2936
2937         /* Get the initial bits to apply. */
2938
2939         if (fsp->is_directory) {
2940                 and_bits = lp_dir_security_mask(snum);
2941                 or_bits = lp_force_dir_security_mode(snum);
2942         } else {
2943                 and_bits = lp_security_mask(snum);
2944                 or_bits = lp_force_security_mode(snum);
2945         }
2946
2947         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2948
2949         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2950                 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2951                 fsp->fsp_name ));
2952
2953         return True;
2954 }
2955
2956 /****************************************************************************
2957   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2958   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2959   with CI|OI set so it is inherited and also applies to the directory.
2960   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2961 ****************************************************************************/
2962
2963 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2964 {
2965         size_t i, j;
2966
2967         for (i = 0; i < num_aces; i++) {
2968                 for (j = i+1; j < num_aces; j++) {
2969                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2970                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2971                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2972                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2973
2974                         /* We know the lower number ACE's are file entries. */
2975                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2976                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2977                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2978                                 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2979                                 (i_inh == j_inh) &&
2980                                 (i_flags_ni == 0) &&
2981                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2982                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
2983                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
2984                                 /*
2985                                  * W2K wants to have access allowed zero access ACE's
2986                                  * at the end of the list. If the mask is zero, merge
2987                                  * the non-inherited ACE onto the inherited ACE.
2988                                  */
2989
2990                                 if (nt_ace_list[i].access_mask == 0) {
2991                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2992                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2993                                         if (num_aces - i - 1 > 0)
2994                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2995                                                                 sizeof(SEC_ACE));
2996
2997                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2998                                                 (unsigned int)i, (unsigned int)j ));
2999                                 } else {
3000                                         /*
3001                                          * These are identical except for the flags.
3002                                          * Merge the inherited ACE onto the non-inherited ACE.
3003                                          */
3004
3005                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3006                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3007                                         if (num_aces - j - 1 > 0)
3008                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3009                                                                 sizeof(SEC_ACE));
3010
3011                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3012                                                 (unsigned int)j, (unsigned int)i ));
3013                                 }
3014                                 num_aces--;
3015                                 break;
3016                         }
3017                 }
3018         }
3019
3020         return num_aces;
3021 }
3022
3023 /*
3024  * Add or Replace ACE entry.
3025  * In some cases we need to add a specific ACE for compatibility reasons.
3026  * When doing that we must make sure we are not actually creating a duplicate
3027  * entry. So we need to search whether an ACE entry already exist and eventually
3028  * replacce the access mask, or add a completely new entry if none was found.
3029  *
3030  * This function assumes the array has enough space to add a new entry without
3031  * any reallocation of memory.
3032  */
3033
3034 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3035                                 const DOM_SID *sid, enum security_ace_type type,
3036                                 uint32_t mask, uint8_t flags)
3037 {
3038         int i;
3039
3040         /* first search for a duplicate */
3041         for (i = 0; i < *num_aces; i++) {
3042                 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3043                     (nt_ace_list[i].flags == flags)) break;
3044         }
3045
3046         if (i < *num_aces) { /* found */
3047                 nt_ace_list[i].type = type;
3048                 nt_ace_list[i].access_mask = mask;
3049                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3050                            i, sid_string_dbg(sid), flags));
3051                 return;
3052         }
3053
3054         /* not found, append it */
3055         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3056 }
3057
3058
3059 /****************************************************************************
3060  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3061  the space for the return elements and returns the size needed to return the
3062  security descriptor. This should be the only external function needed for
3063  the UNIX style get ACL.
3064 ****************************************************************************/
3065
3066 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3067                                       const char *name,
3068                                       const SMB_STRUCT_STAT *sbuf,
3069                                       struct pai_val *pal,
3070                                       SMB_ACL_T posix_acl,
3071                                       SMB_ACL_T def_acl,
3072                                       uint32_t security_info,
3073                                       SEC_DESC **ppdesc)
3074 {
3075         DOM_SID owner_sid;
3076         DOM_SID group_sid;
3077         size_t sd_size = 0;
3078         SEC_ACL *psa = NULL;
3079         size_t num_acls = 0;
3080         size_t num_def_acls = 0;
3081         size_t num_aces = 0;
3082         canon_ace *file_ace = NULL;
3083         canon_ace *dir_ace = NULL;
3084         SEC_ACE *nt_ace_list = NULL;
3085         size_t num_profile_acls = 0;
3086         DOM_SID orig_owner_sid;
3087         SEC_DESC *psd = NULL;
3088         int i;
3089
3090         /*
3091          * Get the owner, group and world SIDs.
3092          */
3093
3094         create_file_sids(sbuf, &owner_sid, &group_sid);
3095
3096         if (lp_profile_acls(SNUM(conn))) {
3097                 /* For WXP SP1 the owner must be administrators. */
3098                 sid_copy(&orig_owner_sid, &owner_sid);
3099                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3100                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3101                 num_profile_acls = 3;
3102         }
3103
3104         if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3105
3106                 /*
3107                  * In the optimum case Creator Owner and Creator Group would be used for
3108                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3109                  * would lead to usability problems under Windows: The Creator entries
3110                  * are only available in browse lists of directories and not for files;
3111                  * additionally the identity of the owning group couldn't be determined.
3112                  * We therefore use those identities only for Default ACLs.
3113                  */
3114
3115                 /* Create the canon_ace lists. */
3116                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3117                                             &owner_sid, &group_sid, pal,
3118                                             SMB_ACL_TYPE_ACCESS);
3119
3120                 /* We must have *some* ACLS. */
3121
3122                 if (count_canon_ace_list(file_ace) == 0) {
3123                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3124                         goto done;
3125                 }
3126
3127                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3128                         dir_ace = canonicalise_acl(conn, name, def_acl,
3129                                                    sbuf,
3130                                                    &global_sid_Creator_Owner,
3131                                                    &global_sid_Creator_Group,
3132                                                    pal, SMB_ACL_TYPE_DEFAULT);
3133                 }
3134
3135                 /*
3136                  * Create the NT ACE list from the canonical ace lists.
3137                  */
3138
3139                 {
3140                         canon_ace *ace;
3141                         enum security_ace_type nt_acl_type;
3142
3143                         if (nt4_compatible_acls() && dir_ace) {
3144                                 /*
3145                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3146                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3147                                  * remove entries from the Access ACL if the
3148                                  * corresponding Default ACL entries have also been
3149                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3150                                  * are exceptions. We can do nothing
3151                                  * intelligent if the Default ACL contains entries that
3152                                  * are not also contained in the Access ACL, so this
3153                                  * case will still fail under NT 4.
3154                                  */
3155
3156                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3157                                 if (ace && !ace->perms) {
3158                                         DLIST_REMOVE(dir_ace, ace);
3159                                         SAFE_FREE(ace);
3160
3161                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3162                                         if (ace && !ace->perms) {
3163                                                 DLIST_REMOVE(file_ace, ace);
3164                                                 SAFE_FREE(ace);
3165                                         }
3166                                 }
3167
3168                                 /*
3169                                  * WinNT doesn't usually have Creator Group
3170                                  * in browse lists, so we send this entry to
3171                                  * WinNT even if it contains no relevant
3172                                  * permissions. Once we can add
3173                                  * Creator Group to browse lists we can
3174                                  * re-enable this.
3175                                  */
3176
3177 #if 0
3178                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3179                                 if (ace && !ace->perms) {
3180                                         DLIST_REMOVE(dir_ace, ace);
3181                                         SAFE_FREE(ace);
3182                                 }
3183 #endif
3184
3185                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3186                                 if (ace && !ace->perms) {
3187                                         DLIST_REMOVE(file_ace, ace);
3188                                         SAFE_FREE(ace);
3189                                 }
3190                         }
3191
3192                         num_acls = count_canon_ace_list(file_ace);
3193                         num_def_acls = count_canon_ace_list(dir_ace);
3194
3195                         /* Allocate the ace list. */
3196                         if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3197                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3198                                 goto done;
3199                         }
3200
3201                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3202
3203                         /*
3204                          * Create the NT ACE list from the canonical ace lists.
3205                          */
3206
3207                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3208                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3209                                                 &nt_acl_type,
3210                                                 ace->perms,
3211                                                 S_ISDIR(sbuf->st_ex_mode));
3212                                 init_sec_ace(&nt_ace_list[num_aces++],
3213                                         &ace->trustee,
3214                                         nt_acl_type,
3215                                         acc,
3216                                         ace->ace_flags);
3217                         }
3218
3219                         /* The User must have access to a profile share - even
3220                          * if we can't map the SID. */
3221                         if (lp_profile_acls(SNUM(conn))) {
3222                                 add_or_replace_ace(nt_ace_list, &num_aces,
3223                                                    &global_sid_Builtin_Users,
3224                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3225                                                    FILE_GENERIC_ALL, 0);
3226                         }
3227
3228                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3229                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3230                                                 &nt_acl_type,
3231                                                 ace->perms,
3232                                                 S_ISDIR(sbuf->st_ex_mode));
3233                                 init_sec_ace(&nt_ace_list[num_aces++],
3234                                         &ace->trustee,
3235                                         nt_acl_type,
3236                                         acc,
3237                                         ace->ace_flags |
3238                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3239                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3240                                         SEC_ACE_FLAG_INHERIT_ONLY);
3241                         }
3242
3243                         /* The User must have access to a profile share - even
3244                          * if we can't map the SID. */
3245                         if (lp_profile_acls(SNUM(conn))) {
3246                                 add_or_replace_ace(nt_ace_list, &num_aces,
3247                                                 &global_sid_Builtin_Users,
3248                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3249                                                 FILE_GENERIC_ALL,
3250                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3251                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3252                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3253                         }
3254
3255                         /*
3256                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3257                          * Win2K needs this to get the inheritance correct when replacing ACLs
3258                          * on a directory tree. Based on work by Jim @ IBM.
3259                          */
3260
3261                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3262
3263                         if (lp_profile_acls(SNUM(conn))) {
3264                                 for (i = 0; i < num_aces; i++) {
3265                                         if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3266                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3267                                                                    &orig_owner_sid,
3268                                                                    nt_ace_list[i].type,
3269                                                                    nt_ace_list[i].access_mask,
3270                                                                    nt_ace_list[i].flags);
3271                                                 break;
3272                                         }
3273                                 }
3274                         }
3275                 }
3276
3277                 if (num_aces) {
3278                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3279                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3280                                 goto done;
3281                         }
3282                 }
3283         } /* security_info & DACL_SECURITY_INFORMATION */
3284
3285         psd = make_standard_sec_desc( talloc_tos(),
3286                         (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3287                         (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3288                         psa,
3289                         &sd_size);
3290
3291         if(!psd) {
3292                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3293                 sd_size = 0;
3294                 goto done;
3295         }
3296
3297         /*
3298          * Windows 2000: The DACL_PROTECTED flag in the security
3299          * descriptor marks the ACL as non-inheriting, i.e., no
3300          * ACEs from higher level directories propagate to this
3301          * ACL. In the POSIX ACL model permissions are only
3302          * inherited at file create time, so ACLs never contain
3303          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3304          * flag doesn't seem to bother Windows NT.
3305          * Always set this if map acl inherit is turned off.
3306          */
3307         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3308                 psd->type |= SEC_DESC_DACL_PROTECTED;
3309         } else {
3310                 psd->type |= pal->sd_type;
3311         }
3312
3313         if (psd->dacl) {
3314                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3315         }
3316
3317         *ppdesc = psd;
3318
3319  done:
3320
3321         if (posix_acl) {
3322                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3323         }
3324         if (def_acl) {
3325                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3326         }
3327         free_canon_ace_list(file_ace);
3328         free_canon_ace_list(dir_ace);
3329         free_inherited_info(pal);
3330         SAFE_FREE(nt_ace_list);
3331
3332         return NT_STATUS_OK;
3333 }
3334
3335 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3336                            SEC_DESC **ppdesc)
3337 {
3338         SMB_STRUCT_STAT sbuf;
3339         SMB_ACL_T posix_acl = NULL;
3340         struct pai_val *pal;
3341
3342         *ppdesc = NULL;
3343
3344         DEBUG(10,("posix_fget_nt_acl: called for file %s\n", fsp->fsp_name ));
3345
3346         /* can it happen that fsp_name == NULL ? */
3347         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3348                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name,
3349                                         security_info, ppdesc);
3350         }
3351
3352         /* Get the stat struct for the owner info. */
3353         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3354                 return map_nt_error_from_unix(errno);
3355         }
3356
3357         /* Get the ACL from the fd. */
3358         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3359
3360         pal = fload_inherited_info(fsp);
3361
3362         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name, &sbuf, pal,
3363                                        posix_acl, NULL, security_info, ppdesc);
3364 }
3365
3366 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3367                           uint32_t security_info, SEC_DESC **ppdesc)
3368 {
3369         SMB_STRUCT_STAT sbuf;
3370         SMB_ACL_T posix_acl = NULL;
3371         SMB_ACL_T def_acl = NULL;
3372         struct pai_val *pal;
3373
3374         *ppdesc = NULL;
3375
3376         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3377
3378         /* Get the stat struct for the owner info. */
3379         if(vfs_stat_smb_fname(conn, name, &sbuf) != 0) {
3380                 return map_nt_error_from_unix(errno);
3381         }
3382
3383         /* Get the ACL from the path. */
3384         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3385
3386         /* If it's a directory get the default POSIX ACL. */
3387         if(S_ISDIR(sbuf.st_ex_mode)) {
3388                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3389                 def_acl = free_empty_sys_acl(conn, def_acl);
3390         }
3391
3392         pal = load_inherited_info(conn, name);
3393
3394         return posix_get_nt_acl_common(conn, name, &sbuf, pal, posix_acl,
3395                                        def_acl, security_info, ppdesc);
3396 }
3397
3398 /****************************************************************************
3399  Try to chown a file. We will be able to chown it under the following conditions.
3400
3401   1) If we have root privileges, then it will just work.
3402   2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3403   3) If we have SeRestorePrivilege we can change the user to any other user.
3404   4) If we have write permission to the file and dos_filemodes is set
3405      then allow chown to the currently authenticated user.
3406 ****************************************************************************/
3407
3408 int try_chown(connection_struct *conn, const char *fname, uid_t uid, gid_t gid)
3409 {
3410         int ret;
3411         files_struct *fsp;
3412         SMB_STRUCT_STAT st;
3413
3414         if(!CAN_WRITE(conn)) {
3415                 return -1;
3416         }
3417
3418         /* Case (1). */
3419         /* try the direct way first */
3420         ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
3421         if (ret == 0)
3422                 return 0;
3423
3424         /* Case (2) / (3) */
3425         if (lp_enable_privileges()) {
3426
3427                 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3428                                                               &se_take_ownership);
3429                 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3430                                                        &se_restore);
3431
3432                 /* Case (2) */
3433                 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3434                 /* Case (3) */
3435                      ( has_restore_priv ) ) {
3436
3437                         become_root();
3438                         /* Keep the current file gid the same - take ownership doesn't imply group change. */
3439                         ret = SMB_VFS_CHOWN(conn, fname, uid, (gid_t)-1);
3440                         unbecome_root();
3441                         return ret;
3442                 }
3443         }
3444
3445         /* Case (4). */
3446         if (!lp_dos_filemode(SNUM(conn))) {
3447                 errno = EPERM;
3448                 return -1;
3449         }
3450
3451         /* only allow chown to the current user. This is more secure,
3452            and also copes with the case where the SID in a take ownership ACL is
3453            a local SID on the users workstation
3454         */
3455         if (uid != current_user.ut.uid) {
3456                 errno = EPERM;
3457                 return -1;
3458         }
3459
3460         if (vfs_stat_smb_fname(conn,fname,&st)) {
3461                 return -1;
3462         }
3463
3464         if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, fname, &st, &fsp))) {
3465                 return -1;
3466         }
3467
3468         become_root();
3469         /* Keep the current file gid the same. */
3470         ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3471         unbecome_root();
3472
3473         close_file_fchmod(NULL, fsp);
3474
3475         return ret;
3476 }
3477
3478 #if 0
3479 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3480
3481 /****************************************************************************
3482  Take care of parent ACL inheritance.
3483 ****************************************************************************/
3484
3485 NTSTATUS append_parent_acl(files_struct *fsp,
3486                                 const SEC_DESC *pcsd,
3487                                 SEC_DESC **pp_new_sd)
3488 {
3489         struct smb_filename *smb_dname = NULL;
3490         SEC_DESC *parent_sd = NULL;
3491         files_struct *parent_fsp = NULL;
3492         TALLOC_CTX *mem_ctx = talloc_tos();
3493         char *parent_name = NULL;
3494         SEC_ACE *new_ace = NULL;
3495         unsigned int num_aces = pcsd->dacl->num_aces;
3496         NTSTATUS status;
3497         int info;
3498         unsigned int i, j;
3499         SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3500         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3501
3502         if (psd == NULL) {
3503                 return NT_STATUS_NO_MEMORY;
3504         }
3505
3506         if (!parent_dirname(mem_ctx, fsp->fsp_name, &parent_name, NULL)) {
3507                 return NT_STATUS_NO_MEMORY;
3508         }
3509
3510         status = create_synthetic_smb_fname_split(mem_ctx, parent_name, NULL,
3511                                                   &smb_dname);
3512         if (!NT_STATUS_IS_OK(status)) {
3513                 goto fail;
3514         }
3515
3516         status = SMB_VFS_CREATE_FILE(
3517                 fsp->conn,                              /* conn */
3518                 NULL,                                   /* req */
3519                 0,                                      /* root_dir_fid */
3520                 smb_dname,                              /* fname */
3521                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3522                 FILE_SHARE_NONE,                        /* share_access */
3523                 FILE_OPEN,                              /* create_disposition*/
3524                 FILE_DIRECTORY_FILE,                    /* create_options */
3525                 0,                                      /* file_attributes */
3526                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3527                 0,                                      /* allocation_size */
3528                 NULL,                                   /* sd */
3529                 NULL,                                   /* ea_list */
3530                 &parent_fsp,                            /* result */
3531                 &info);                                 /* pinfo */
3532
3533         TALLOC_FREE(smb_fname);
3534
3535         if (!NT_STATUS_IS_OK(status)) {
3536                 return status;
3537         }
3538
3539         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, parent_fsp->fsp_name,
3540                                     DACL_SECURITY_INFORMATION, &parent_sd );
3541
3542         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3543
3544         if (!NT_STATUS_IS_OK(status)) {
3545                 return status;
3546         }
3547
3548         /*
3549          * Make room for potentially all the ACLs from
3550          * the parent. We used to add the ugw triple here,
3551          * as we knew we were dealing with POSIX ACLs.
3552          * We no longer need to do so as we can guarentee
3553          * that a default ACL from the parent directory will
3554          * be well formed for POSIX ACLs if it came from a
3555          * POSIX ACL source, and if we're not writing to a
3556          * POSIX ACL sink then we don't care if it's not well
3557          * formed. JRA.
3558          */
3559
3560         num_aces += parent_sd->dacl->num_aces;
3561
3562         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3563                                         num_aces)) == NULL) {
3564                 return NT_STATUS_NO_MEMORY;
3565         }
3566
3567         /* Start by copying in all the given ACE entries. */
3568         for (i = 0; i < psd->dacl->num_aces; i++) {
3569                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3570         }
3571
3572         /*
3573          * Note that we're ignoring "inherit permissions" here
3574          * as that really only applies to newly created files. JRA.
3575          */
3576
3577         /* Finally append any inherited ACEs. */
3578         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3579                 SEC_ACE *se = &parent_sd->dacl->aces[j];
3580
3581                 if (fsp->is_directory) {
3582                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3583                                 /* Doesn't apply to a directory - ignore. */
3584                                 DEBUG(10,("append_parent_acl: directory %s "
3585                                         "ignoring non container "
3586                                         "inherit flags %u on ACE with sid %s "
3587                                         "from parent %s\n",
3588                                         fsp->fsp_name,
3589                                         (unsigned int)se->flags,
3590                                         sid_string_dbg(&se->trustee),
3591                                         parent_name));
3592                                 continue;
3593                         }
3594                 } else {
3595                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3596                                 /* Doesn't apply to a file - ignore. */
3597                                 DEBUG(10,("append_parent_acl: file %s "
3598                                         "ignoring non object "
3599                                         "inherit flags %u on ACE with sid %s "
3600                                         "from parent %s\n",
3601                                         fsp->fsp_name,
3602                                         (unsigned int)se->flags,
3603                                         sid_string_dbg(&se->trustee),
3604                                         parent_name));
3605                                 continue;
3606                         }
3607                 }
3608
3609                 if (is_dacl_protected) {
3610                         /* If the DACL is protected it means we must
3611                          * not overwrite an existing ACE entry with the
3612                          * same SID. This is order N^2. Ouch :-(. JRA. */
3613                         unsigned int k;
3614                         for (k = 0; k < psd->dacl->num_aces; k++) {
3615                                 if (sid_equal(&psd->dacl->aces[k].trustee,
3616                                                 &se->trustee)) {
3617                                         break;
3618                                 }
3619                         }
3620                         if (k < psd->dacl->num_aces) {
3621                                 /* SID matched. Ignore. */
3622                                 DEBUG(10,("append_parent_acl: path %s "
3623                                         "ignoring ACE with protected sid %s "
3624                                         "from parent %s\n",
3625                                         fsp->fsp_name,
3626                                         sid_string_dbg(&se->trustee),
3627                                         parent_name));
3628                                 continue;
3629                         }
3630                 }
3631
3632                 sec_ace_copy(&new_ace[i], se);
3633                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3634                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3635                 }
3636                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3637
3638                 if (fsp->is_directory) {
3639                         /*
3640                          * Strip off any inherit only. It's applied.
3641                          */
3642                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3643                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3644                                 /* No further inheritance. */
3645                                 new_ace[i].flags &=
3646                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3647                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3648                         }
3649                 } else {
3650                         /*
3651                          * Strip off any container or inherit
3652                          * flags, they can't apply to objects.
3653                          */
3654                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3655                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3656                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3657                 }
3658                 i++;
3659
3660                 DEBUG(10,("append_parent_acl: path %s "
3661                         "inheriting ACE with sid %s "
3662                         "from parent %s\n",
3663                         fsp->fsp_name,
3664                         sid_string_dbg(&se->trustee),
3665                         parent_name));
3666         }
3667
3668         psd->dacl->aces = new_ace;
3669         psd->dacl->num_aces = i;
3670         psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3671                          SE_DESC_DACL_AUTO_INHERIT_REQ);
3672
3673         *pp_new_sd = psd;
3674         return status;
3675 }
3676 #endif
3677
3678 /****************************************************************************
3679  Reply to set a security descriptor on an fsp. security_info_sent is the
3680  description of the following NT ACL.
3681  This should be the only external function needed for the UNIX style set ACL.
3682 ****************************************************************************/
3683
3684 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd)
3685 {
3686         connection_struct *conn = fsp->conn;
3687         uid_t user = (uid_t)-1;
3688         gid_t grp = (gid_t)-1;
3689         SMB_STRUCT_STAT sbuf;
3690         DOM_SID file_owner_sid;
3691         DOM_SID file_grp_sid;
3692         canon_ace *file_ace_list = NULL;
3693         canon_ace *dir_ace_list = NULL;
3694         bool acl_perms = False;
3695         mode_t orig_mode = (mode_t)0;
3696         NTSTATUS status;
3697         bool set_acl_as_root = false;
3698         bool acl_set_support = false;
3699         bool ret = false;
3700
3701         DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
3702
3703         if (!CAN_WRITE(conn)) {
3704                 DEBUG(10,("set acl rejected on read-only share\n"));
3705                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3706         }
3707
3708         /*
3709          * Get the current state of the file.
3710          */
3711
3712         if(fsp->is_directory || fsp->fh->fd == -1) {
3713                 if(vfs_stat_smb_fname(fsp->conn,fsp->fsp_name, &sbuf) != 0)
3714                         return map_nt_error_from_unix(errno);
3715         } else {
3716                 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0)
3717                         return map_nt_error_from_unix(errno);
3718         }
3719
3720         /* Save the original element we check against. */
3721         orig_mode = sbuf.st_ex_mode;
3722
3723         /*
3724          * Unpack the user/group/world id's.
3725          */
3726
3727         status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3728         if (!NT_STATUS_IS_OK(status)) {
3729                 return status;
3730         }
3731
3732         /*
3733          * Do we need to chown ? If so this must be done first as the incoming
3734          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3735          * Noticed by Simo.
3736          */
3737
3738         if (((user != (uid_t)-1) && (sbuf.st_ex_uid != user)) || (( grp != (gid_t)-1) && (sbuf.st_ex_gid != grp))) {
3739
3740                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3741                                 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3742
3743                 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3744                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3745                                 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3746                         if (errno == EPERM) {
3747                                 return NT_STATUS_INVALID_OWNER;
3748                         }
3749                         return map_nt_error_from_unix(errno);
3750                 }
3751
3752                 /*
3753                  * Recheck the current state of the file, which may have changed.
3754                  * (suid/sgid bits, for instance)
3755                  */
3756
3757                 if(fsp->is_directory) {
3758                         if(vfs_stat_smb_fname(fsp->conn, fsp->fsp_name,
3759                                               &sbuf) != 0) {
3760                                 return map_nt_error_from_unix(errno);
3761                         }
3762                 } else {
3763
3764                         int sret;
3765
3766                         if(fsp->fh->fd == -1)
3767                                 sret = vfs_stat_smb_fname(fsp->conn,
3768                                                           fsp->fsp_name,
3769                                                           &sbuf);
3770                         else
3771                                 sret = SMB_VFS_FSTAT(fsp, &sbuf);
3772
3773                         if(sret != 0)
3774                                 return map_nt_error_from_unix(errno);
3775                 }
3776
3777                 /* Save the original element we check against. */
3778                 orig_mode = sbuf.st_ex_mode;
3779
3780                 /* If we successfully chowned, we know we must
3781                  * be able to set the acl, so do it as root.
3782                  */
3783                 set_acl_as_root = true;
3784         }
3785
3786         create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3787
3788         acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3789                                         &file_ace_list, &dir_ace_list, security_info_sent, psd);
3790
3791         /* Ignore W2K traverse DACL set. */
3792         if (!file_ace_list && !dir_ace_list) {
3793                 return NT_STATUS_OK;
3794         }
3795
3796         if (!acl_perms) {
3797                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3798                 free_canon_ace_list(file_ace_list);
3799                 free_canon_ace_list(dir_ace_list);
3800                 return NT_STATUS_ACCESS_DENIED;
3801         }
3802
3803         /*
3804          * Only change security if we got a DACL.
3805          */
3806
3807         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3808                 free_canon_ace_list(file_ace_list);
3809                 free_canon_ace_list(dir_ace_list);
3810                 return NT_STATUS_OK;
3811         }
3812
3813         /*
3814          * Try using the POSIX ACL set first. Fall back to chmod if
3815          * we have no ACL support on this filesystem.
3816          */
3817
3818         if (acl_perms && file_ace_list) {
3819                 if (set_acl_as_root) {
3820                         become_root();
3821                 }
3822                 ret = set_canon_ace_list(fsp, file_ace_list, False, &sbuf, &acl_set_support);
3823                 if (set_acl_as_root) {
3824                         unbecome_root();
3825                 }
3826                 if (acl_set_support && ret == false) {
3827                         DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3828                         free_canon_ace_list(file_ace_list);
3829                         free_canon_ace_list(dir_ace_list);
3830                         return map_nt_error_from_unix(errno);
3831                 }
3832         }
3833
3834         if (acl_perms && acl_set_support && fsp->is_directory) {
3835                 if (dir_ace_list) {
3836                         if (set_acl_as_root) {
3837                                 become_root();
3838                         }
3839                         ret = set_canon_ace_list(fsp, dir_ace_list, True, &sbuf, &acl_set_support);
3840                         if (set_acl_as_root) {
3841                                 unbecome_root();
3842                         }
3843                         if (ret == false) {
3844                                 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3845                                 free_canon_ace_list(file_ace_list);
3846                                 free_canon_ace_list(dir_ace_list);
3847                                 return map_nt_error_from_unix(errno);
3848                         }
3849                 } else {
3850                         int sret = -1;
3851
3852                         /*
3853                          * No default ACL - delete one if it exists.
3854                          */
3855
3856                         if (set_acl_as_root) {
3857                                 become_root();
3858                         }
3859                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3860                         if (set_acl_as_root) {
3861                                 unbecome_root();
3862                         }
3863                         if (sret == -1) {
3864                                 if (acl_group_override(conn, &sbuf, fsp->fsp_name)) {
3865                                         DEBUG(5,("set_nt_acl: acl group control on and "
3866                                                 "current user in file %s primary group. Override delete_def_acl\n",
3867                                                 fsp->fsp_name ));
3868
3869                                         become_root();
3870                                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3871                                         unbecome_root();
3872                                 }
3873
3874                                 if (sret == -1) {
3875                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3876                                         free_canon_ace_list(file_ace_list);
3877                                         free_canon_ace_list(dir_ace_list);
3878                                         return map_nt_error_from_unix(errno);
3879                                 }
3880                         }
3881                 }
3882         }
3883
3884         if (acl_set_support) {
3885                 if (set_acl_as_root) {
3886                         become_root();
3887                 }
3888                 store_inheritance_attributes(fsp,
3889                                 file_ace_list,
3890                                 dir_ace_list,
3891                                 psd->type);
3892                 if (set_acl_as_root) {
3893                         unbecome_root();
3894                 }
3895         }
3896
3897         /*
3898          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3899          */
3900
3901         if(!acl_set_support && acl_perms) {
3902                 mode_t posix_perms;
3903
3904                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3905                         free_canon_ace_list(file_ace_list);
3906                         free_canon_ace_list(dir_ace_list);
3907                         DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3908                                 fsp->fsp_name ));
3909                         return NT_STATUS_ACCESS_DENIED;
3910                 }
3911
3912                 if (orig_mode != posix_perms) {
3913                         int sret = -1;
3914
3915                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3916                                 fsp->fsp_name, (unsigned int)posix_perms ));
3917
3918                         if (set_acl_as_root) {
3919                                 become_root();
3920                         }
3921                         sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3922                         if (set_acl_as_root) {
3923                                 unbecome_root();
3924                         }
3925                         if(sret == -1) {
3926                                 if (acl_group_override(conn, &sbuf, fsp->fsp_name)) {
3927                                         DEBUG(5,("set_nt_acl: acl group control on and "
3928                                                 "current user in file %s primary group. Override chmod\n",
3929                                                 fsp->fsp_name ));
3930
3931                                         become_root();
3932                                         sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3933                                         unbecome_root();
3934                                 }
3935
3936                                 if (sret == -1) {
3937                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3938                                                 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3939                                         free_canon_ace_list(file_ace_list);
3940                                         free_canon_ace_list(dir_ace_list);
3941                                         return map_nt_error_from_unix(errno);
3942                                 }
3943                         }
3944                 }
3945         }
3946
3947         free_canon_ace_list(file_ace_list);
3948         free_canon_ace_list(dir_ace_list);
3949
3950         return NT_STATUS_OK;
3951 }
3952
3953 /****************************************************************************
3954  Get the actual group bits stored on a file with an ACL. Has no effect if
3955  the file has no ACL. Needed in dosmode code where the stat() will return
3956  the mask bits, not the real group bits, for a file with an ACL.
3957 ****************************************************************************/
3958
3959 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3960 {
3961         int entry_id = SMB_ACL_FIRST_ENTRY;
3962         SMB_ACL_ENTRY_T entry;
3963         SMB_ACL_T posix_acl;
3964         int result = -1;
3965
3966         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3967         if (posix_acl == (SMB_ACL_T)NULL)
3968                 return -1;
3969
3970         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3971                 SMB_ACL_TAG_T tagtype;
3972                 SMB_ACL_PERMSET_T permset;
3973
3974                 entry_id = SMB_ACL_NEXT_ENTRY;
3975
3976                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3977                         break;
3978
3979                 if (tagtype == SMB_ACL_GROUP_OBJ) {
3980                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3981                                 break;
3982                         } else {
3983                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
3984                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3985                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3986                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3987                                 result = 0;
3988                                 break;
3989                         }
3990                 }
3991         }
3992         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3993         return result;
3994 }
3995
3996 /****************************************************************************
3997  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3998  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3999 ****************************************************************************/
4000
4001 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4002 {
4003         int entry_id = SMB_ACL_FIRST_ENTRY;
4004         SMB_ACL_ENTRY_T entry;
4005         int num_entries = 0;
4006
4007         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4008                 SMB_ACL_TAG_T tagtype;
4009                 SMB_ACL_PERMSET_T permset;
4010                 mode_t perms;
4011
4012                 entry_id = SMB_ACL_NEXT_ENTRY;
4013
4014                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4015                         return -1;
4016
4017                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4018                         return -1;
4019
4020                 num_entries++;
4021
4022                 switch(tagtype) {
4023                         case SMB_ACL_USER_OBJ:
4024                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4025                                 break;
4026                         case SMB_ACL_GROUP_OBJ:
4027                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4028                                 break;
4029                         case SMB_ACL_MASK:
4030                                 /*
4031                                  * FIXME: The ACL_MASK entry permissions should really be set to
4032                                  * the union of the permissions of all ACL_USER,
4033                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4034                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4035                                  */
4036                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4037                                 break;
4038                         case SMB_ACL_OTHER:
4039                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4040                                 break;
4041                         default:
4042                                 continue;
4043                 }
4044
4045                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4046                         return -1;
4047
4048                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4049                         return -1;
4050         }
4051
4052         /*
4053          * If this is a simple 3 element ACL or no elements then it's a standard
4054          * UNIX permission set. Just use chmod...
4055          */
4056
4057         if ((num_entries == 3) || (num_entries == 0))
4058                 return -1;
4059
4060         return 0;
4061 }
4062
4063 /****************************************************************************
4064  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4065  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4066  resulting ACL on TO.  Note that name is in UNIX character set.
4067 ****************************************************************************/
4068
4069 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4070 {
4071         SMB_ACL_T posix_acl = NULL;
4072         int ret = -1;
4073
4074         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4075                 return -1;
4076
4077         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4078                 goto done;
4079
4080         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4081
4082  done:
4083
4084         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4085         return ret;
4086 }
4087
4088 /****************************************************************************
4089  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4090  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4091  Note that name is in UNIX character set.
4092 ****************************************************************************/
4093
4094 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4095 {
4096         return copy_access_posix_acl(conn, name, name, mode);
4097 }
4098
4099 /****************************************************************************
4100  Check for an existing default POSIX ACL on a directory.
4101 ****************************************************************************/
4102
4103 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4104 {
4105         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4106         bool has_acl = False;
4107         SMB_ACL_ENTRY_T entry;
4108
4109         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4110                 has_acl = True;
4111         }
4112
4113         if (def_acl) {
4114                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4115         }
4116         return has_acl;
4117 }
4118
4119 /****************************************************************************
4120  If the parent directory has no default ACL but it does have an Access ACL,
4121  inherit this Access ACL to file name.
4122 ****************************************************************************/
4123
4124 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4125                        const char *name, mode_t mode)
4126 {
4127         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4128                 return 0;
4129
4130         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4131 }
4132
4133 /****************************************************************************
4134  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4135  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4136 ****************************************************************************/
4137
4138 int fchmod_acl(files_struct *fsp, mode_t mode)
4139 {
4140         connection_struct *conn = fsp->conn;
4141         SMB_ACL_T posix_acl = NULL;
4142         int ret = -1;
4143
4144         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4145                 return -1;
4146
4147         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4148                 goto done;
4149
4150         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4151
4152   done:
4153
4154         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4155         return ret;
4156 }
4157
4158 /****************************************************************************
4159  Map from wire type to permset.
4160 ****************************************************************************/
4161
4162 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4163 {
4164         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4165                 return False;
4166         }
4167
4168         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4169                 return False;
4170         }
4171
4172         if (wire_perm & SMB_POSIX_ACL_READ) {
4173                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4174                         return False;
4175                 }
4176         }
4177         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4178                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4179                         return False;
4180                 }
4181         }
4182         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4183                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4184                         return False;
4185                 }
4186         }
4187         return True;
4188 }
4189
4190 /****************************************************************************
4191  Map from wire type to tagtype.
4192 ****************************************************************************/
4193
4194 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4195 {
4196         switch (wire_tt) {
4197                 case SMB_POSIX_ACL_USER_OBJ:
4198                         *p_tt = SMB_ACL_USER_OBJ;
4199                         break;
4200                 case SMB_POSIX_ACL_USER:
4201                         *p_tt = SMB_ACL_USER;
4202                         break;
4203                 case SMB_POSIX_ACL_GROUP_OBJ:
4204                         *p_tt = SMB_ACL_GROUP_OBJ;
4205                         break;
4206                 case SMB_POSIX_ACL_GROUP:
4207                         *p_tt = SMB_ACL_GROUP;
4208                         break;
4209                 case SMB_POSIX_ACL_MASK:
4210                         *p_tt = SMB_ACL_MASK;
4211                         break;
4212                 case SMB_POSIX_ACL_OTHER:
4213                         *p_tt = SMB_ACL_OTHER;
4214                         break;
4215                 default:
4216                         return False;
4217         }
4218         return True;
4219 }
4220
4221 /****************************************************************************
4222  Create a new POSIX acl from wire permissions.
4223  FIXME ! How does the share mask/mode fit into this.... ?
4224 ****************************************************************************/
4225
4226 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4227 {
4228         unsigned int i;
4229         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4230
4231         if (the_acl == NULL) {
4232                 return NULL;
4233         }
4234
4235         for (i = 0; i < num_acls; i++) {
4236                 SMB_ACL_ENTRY_T the_entry;
4237                 SMB_ACL_PERMSET_T the_permset;
4238                 SMB_ACL_TAG_T tag_type;
4239
4240                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4241                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4242                                 i, strerror(errno) ));
4243                         goto fail;
4244                 }
4245
4246                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4247                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4248                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4249                         goto fail;
4250                 }
4251
4252                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4253                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4254                                 i, strerror(errno) ));
4255                         goto fail;
4256                 }
4257
4258                 /* Get the permset pointer from the new ACL entry. */
4259                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4260                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4261                                 i, strerror(errno) ));
4262                         goto fail;
4263                 }
4264
4265                 /* Map from wire to permissions. */
4266                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4267                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4268                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4269                         goto fail;
4270                 }
4271
4272                 /* Now apply to the new ACL entry. */
4273                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4274                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4275                                 i, strerror(errno) ));
4276                         goto fail;
4277                 }
4278
4279                 if (tag_type == SMB_ACL_USER) {
4280                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4281                         uid_t uid = (uid_t)uidval;
4282                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4283                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4284                                         (unsigned int)uid, i, strerror(errno) ));
4285                                 goto fail;
4286                         }
4287                 }
4288
4289                 if (tag_type == SMB_ACL_GROUP) {
4290                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4291                         gid_t gid = (uid_t)gidval;
4292                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4293                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4294                                         (unsigned int)gid, i, strerror(errno) ));
4295                                 goto fail;
4296                         }
4297                 }
4298         }
4299
4300         return the_acl;
4301
4302  fail:
4303
4304         if (the_acl != NULL) {
4305                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4306         }
4307         return NULL;
4308 }
4309
4310 /****************************************************************************
4311  Calls from UNIX extensions - Default POSIX ACL set.
4312  If num_def_acls == 0 and not a directory just return. If it is a directory
4313  and num_def_acls == 0 then remove the default acl. Else set the default acl
4314  on the directory.
4315 ****************************************************************************/
4316
4317 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
4318                                 uint16 num_def_acls, const char *pdata)
4319 {
4320         SMB_ACL_T def_acl = NULL;
4321
4322         if (!S_ISDIR(psbuf->st_ex_mode)) {
4323                 if (num_def_acls) {
4324                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4325                         errno = EISDIR;
4326                         return False;
4327                 } else {
4328                         return True;
4329                 }
4330         }
4331
4332         if (!num_def_acls) {
4333                 /* Remove the default ACL. */
4334                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4335                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4336                                 fname, strerror(errno) ));
4337                         return False;
4338                 }
4339                 return True;
4340         }
4341
4342         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4343                 return False;
4344         }
4345
4346         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4347                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4348                         fname, strerror(errno) ));
4349                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4350                 return False;
4351         }
4352
4353         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4354         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4355         return True;
4356 }
4357
4358 /****************************************************************************
4359  Remove an ACL from a file. As we don't have acl_delete_entry() available
4360  we must read the current acl and copy all entries except MASK, USER and GROUP
4361  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4362  removed.
4363  FIXME ! How does the share mask/mode fit into this.... ?
4364 ****************************************************************************/
4365
4366 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4367 {
4368         SMB_ACL_T file_acl = NULL;
4369         int entry_id = SMB_ACL_FIRST_ENTRY;
4370         SMB_ACL_ENTRY_T entry;
4371         bool ret = False;
4372         /* Create a new ACL with only 3 entries, u/g/w. */
4373         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4374         SMB_ACL_ENTRY_T user_ent = NULL;
4375         SMB_ACL_ENTRY_T group_ent = NULL;
4376         SMB_ACL_ENTRY_T other_ent = NULL;
4377
4378         if (new_file_acl == NULL) {
4379                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4380                 return False;
4381         }
4382
4383         /* Now create the u/g/w entries. */
4384         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4385                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4386                         fname, strerror(errno) ));
4387                 goto done;
4388         }
4389         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4390                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4391                         fname, strerror(errno) ));
4392                 goto done;
4393         }
4394
4395         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4396                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4397                         fname, strerror(errno) ));
4398                 goto done;
4399         }
4400         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4401                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4402                         fname, strerror(errno) ));
4403                 goto done;
4404         }
4405
4406         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4407                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4408                         fname, strerror(errno) ));
4409                 goto done;
4410         }
4411         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4412                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4413                         fname, strerror(errno) ));
4414                 goto done;
4415         }
4416
4417         /* Get the current file ACL. */
4418         if (fsp && fsp->fh->fd != -1) {
4419                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4420         } else {
4421                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4422         }
4423
4424         if (file_acl == NULL) {
4425                 /* This is only returned if an error occurred. Even for a file with
4426                    no acl a u/g/w acl should be returned. */
4427                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4428                         fname, strerror(errno) ));
4429                 goto done;
4430         }
4431
4432         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4433                 SMB_ACL_TAG_T tagtype;
4434                 SMB_ACL_PERMSET_T permset;
4435
4436                 entry_id = SMB_ACL_NEXT_ENTRY;
4437
4438                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4439                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4440                                 fname, strerror(errno) ));
4441                         goto done;
4442                 }
4443
4444                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4445                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4446                                 fname, strerror(errno) ));
4447                         goto done;
4448                 }
4449
4450                 if (tagtype == SMB_ACL_USER_OBJ) {
4451                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4452                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4453                                         fname, strerror(errno) ));
4454                         }
4455                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4456                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4457                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4458                                         fname, strerror(errno) ));
4459                         }
4460                 } else if (tagtype == SMB_ACL_OTHER) {
4461                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4462                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4463                                         fname, strerror(errno) ));
4464                         }
4465                 }
4466         }
4467
4468         /* Set the new empty file ACL. */
4469         if (fsp && fsp->fh->fd != -1) {
4470                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4471                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4472                                 fname, strerror(errno) ));
4473                         goto done;
4474                 }
4475         } else {
4476                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4477                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4478                                 fname, strerror(errno) ));
4479                         goto done;
4480                 }
4481         }
4482
4483         ret = True;
4484
4485  done:
4486
4487         if (file_acl) {
4488                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4489         }
4490         if (new_file_acl) {
4491                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4492         }
4493         return ret;
4494 }
4495
4496 /****************************************************************************
4497  Calls from UNIX extensions - POSIX ACL set.
4498  If num_def_acls == 0 then read/modify/write acl after removing all entries
4499  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4500 ****************************************************************************/
4501
4502 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4503 {
4504         SMB_ACL_T file_acl = NULL;
4505
4506         if (!num_acls) {
4507                 /* Remove the ACL from the file. */
4508                 return remove_posix_acl(conn, fsp, fname);
4509         }
4510
4511         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4512                 return False;
4513         }
4514
4515         if (fsp && fsp->fh->fd != -1) {
4516                 /* The preferred way - use an open fd. */
4517                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4518                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4519                                 fname, strerror(errno) ));
4520                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4521                         return False;
4522                 }
4523         } else {
4524                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4525                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4526                                 fname, strerror(errno) ));
4527                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4528                         return False;
4529                 }
4530         }
4531
4532         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4533         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4534         return True;
4535 }
4536
4537 /********************************************************************
4538  Pull the NT ACL from a file on disk or the OpenEventlog() access
4539  check.  Caller is responsible for freeing the returned security
4540  descriptor via TALLOC_FREE().  This is designed for dealing with
4541  user space access checks in smbd outside of the VFS.  For example,
4542  checking access rights in OpenEventlog().
4543
4544  Assume we are dealing with files (for now)
4545 ********************************************************************/
4546
4547 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4548 {
4549         SEC_DESC *psd, *ret_sd;
4550         connection_struct *conn;
4551         files_struct finfo;
4552         struct fd_handle fh;
4553
4554         conn = TALLOC_ZERO_P(ctx, connection_struct);
4555         if (conn == NULL) {
4556                 DEBUG(0, ("talloc failed\n"));
4557                 return NULL;
4558         }
4559
4560         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4561                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4562                 TALLOC_FREE(conn);
4563                 return NULL;
4564         }
4565
4566         conn->params->service = -1;
4567
4568         set_conn_connectpath(conn, "/");
4569
4570         if (!smbd_vfs_init(conn)) {
4571                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4572                 conn_free_internal( conn );
4573                 return NULL;
4574         }
4575
4576         ZERO_STRUCT( finfo );
4577         ZERO_STRUCT( fh );
4578
4579         finfo.fnum = -1;
4580         finfo.conn = conn;
4581         finfo.fh = &fh;
4582         finfo.fh->fd = -1;
4583         finfo.fsp_name = CONST_DISCARD(char *,fname);
4584
4585         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4586                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4587                 conn_free_internal( conn );
4588                 return NULL;
4589         }
4590
4591         ret_sd = dup_sec_desc( ctx, psd );
4592
4593         conn_free_internal( conn );
4594
4595         return ret_sd;
4596 }