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_uid );
 888         gid_to_sid( pgroup_sid, psbuf->st_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         /* notice that this is not reliable for users exported by winbindd! */
1301         return user_in_group_sid(u_name, &group_ace->trustee);
1302 }
1303
1304 /****************************************************************************
1305  A well formed POSIX file or default ACL has at least 3 entries, a
1306  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1307  In addition, the owner must always have at least read access.
1308  When using this call on get_acl, the pst struct is valid and contains
1309  the mode of the file. When using this call on set_acl, the pst struct has
1310  been modified to have a mode containing the default for this file or directory
1311  type.
1312 ****************************************************************************/
1313
1314 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1315                                      const struct share_params *params,
1316                                      const bool is_directory,
1317                                                         const DOM_SID *pfile_owner_sid,
1318                                                         const DOM_SID *pfile_grp_sid,
1319                                                         const SMB_STRUCT_STAT *pst,
1320                                                         bool setting_acl)
1321 {
1322         canon_ace *pace;
1323         bool got_user = False;
1324         bool got_grp = False;
1325         bool got_other = False;
1326         canon_ace *pace_other = NULL;
1327
1328         for (pace = *pp_ace; pace; pace = pace->next) {
1329                 if (pace->type == SMB_ACL_USER_OBJ) {
1330
1331                         if (setting_acl)
1332                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1333                         got_user = True;
1334
1335                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1336
1337                         /*
1338                          * Ensure create mask/force create mode is respected on set.
1339                          */
1340
1341                         if (setting_acl)
1342                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1343                         got_grp = True;
1344
1345                 } else if (pace->type == SMB_ACL_OTHER) {
1346
1347                         /*
1348                          * Ensure create mask/force create mode is respected on set.
1349                          */
1350
1351                         if (setting_acl)
1352                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1353                         got_other = True;
1354                         pace_other = pace;
1355                 }
1356         }
1357
1358         if (!got_user) {
1359                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1360                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1361                         return False;
1362                 }
1363
1364                 ZERO_STRUCTP(pace);
1365                 pace->type = SMB_ACL_USER_OBJ;
1366                 pace->owner_type = UID_ACE;
1367                 pace->unix_ug.uid = pst->st_uid;
1368                 pace->trustee = *pfile_owner_sid;
1369                 pace->attr = ALLOW_ACE;
1370
1371                 if (setting_acl) {
1372                         /* See if the owning user is in any of the other groups in
1373                            the ACE. If so, OR in the permissions from that group. */
1374
1375                         bool group_matched = False;
1376                         canon_ace *pace_iter;
1377
1378                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1379                                 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1380                                         if (uid_entry_in_group(pace, pace_iter)) {
1381                                                 pace->perms |= pace_iter->perms;
1382                                                 group_matched = True;
1383                                         }
1384                                 }
1385                         }
1386
1387                         /* If we only got an "everyone" perm, just use that. */
1388                         if (!group_matched) {
1389                                 if (got_other)
1390                                         pace->perms = pace_other->perms;
1391                                 else
1392                                         pace->perms = 0;
1393                         }
1394
1395                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1396                 } else {
1397                         pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1398                 }
1399
1400                 DLIST_ADD(*pp_ace, pace);
1401         }
1402
1403         if (!got_grp) {
1404                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1405                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1406                         return False;
1407                 }
1408
1409                 ZERO_STRUCTP(pace);
1410                 pace->type = SMB_ACL_GROUP_OBJ;
1411                 pace->owner_type = GID_ACE;
1412                 pace->unix_ug.uid = pst->st_gid;
1413                 pace->trustee = *pfile_grp_sid;
1414                 pace->attr = ALLOW_ACE;
1415                 if (setting_acl) {
1416                         /* If we only got an "everyone" perm, just use that. */
1417                         if (got_other)
1418                                 pace->perms = pace_other->perms;
1419                         else
1420                                 pace->perms = 0;
1421                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1422                 } else {
1423                         pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1424                 }
1425
1426                 DLIST_ADD(*pp_ace, pace);
1427         }
1428
1429         if (!got_other) {
1430                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1431                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1432                         return False;
1433                 }
1434
1435                 ZERO_STRUCTP(pace);
1436                 pace->type = SMB_ACL_OTHER;
1437                 pace->owner_type = WORLD_ACE;
1438                 pace->unix_ug.world = -1;
1439                 pace->trustee = global_sid_World;
1440                 pace->attr = ALLOW_ACE;
1441                 if (setting_acl) {
1442                         pace->perms = 0;
1443                         apply_default_perms(params, is_directory, pace, S_IROTH);
1444                 } else
1445                         pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
1446
1447                 DLIST_ADD(*pp_ace, pace);
1448         }
1449
1450         return True;
1451 }
1452
1453 /****************************************************************************
1454  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1455  If it does not have them, check if there are any entries where the trustee is the
1456  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1457 ****************************************************************************/
1458
1459 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1460 {
1461         bool got_user_obj, got_group_obj;
1462         canon_ace *current_ace;
1463         int i, entries;
1464
1465         entries = count_canon_ace_list(ace);
1466         got_user_obj = False;
1467         got_group_obj = False;
1468
1469         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1470                 if (current_ace->type == SMB_ACL_USER_OBJ)
1471                         got_user_obj = True;
1472                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1473                         got_group_obj = True;
1474         }
1475         if (got_user_obj && got_group_obj) {
1476                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1477                 return;
1478         }
1479
1480         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1481                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1482                                 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1483                         current_ace->type = SMB_ACL_USER_OBJ;
1484                         got_user_obj = True;
1485                 }
1486                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1487                                 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1488                         current_ace->type = SMB_ACL_GROUP_OBJ;
1489                         got_group_obj = True;
1490                 }
1491         }
1492         if (!got_user_obj)
1493                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1494         if (!got_group_obj)
1495                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1496 }
1497
1498 /****************************************************************************
1499  Unpack a SEC_DESC into two canonical ace lists.
1500 ****************************************************************************/
1501
1502 static bool create_canon_ace_lists(files_struct *fsp,
1503                                         SMB_STRUCT_STAT *pst,
1504                                         DOM_SID *pfile_owner_sid,
1505                                         DOM_SID *pfile_grp_sid,
1506                                         canon_ace **ppfile_ace,
1507                                         canon_ace **ppdir_ace,
1508                                         const SEC_ACL *dacl)
1509 {
1510         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1511         canon_ace *file_ace = NULL;
1512         canon_ace *dir_ace = NULL;
1513         canon_ace *current_ace = NULL;
1514         bool got_dir_allow = False;
1515         bool got_file_allow = False;
1516         int i, j;
1517
1518         *ppfile_ace = NULL;
1519         *ppdir_ace = NULL;
1520
1521         /*
1522          * Convert the incoming ACL into a more regular form.
1523          */
1524
1525         for(i = 0; i < dacl->num_aces; i++) {
1526                 SEC_ACE *psa = &dacl->aces[i];
1527
1528                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1529                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1530                         return False;
1531                 }
1532
1533                 if (nt4_compatible_acls()) {
1534                         /*
1535                          * The security mask may be UNIX_ACCESS_NONE which should map into
1536                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1537                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1538                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1539                          */
1540
1541                         /*
1542                          * Convert GENERIC bits to specific bits.
1543                          */
1544
1545                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1546
1547                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1548
1549                         if(psa->access_mask != UNIX_ACCESS_NONE)
1550                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1551                 }
1552         }
1553
1554         /*
1555          * Deal with the fact that NT 4.x re-writes the canonical format
1556          * that we return for default ACLs. If a directory ACE is identical
1557          * to a inherited directory ACE then NT changes the bits so that the
1558          * first ACE is set to OI|IO and the second ACE for this SID is set
1559          * to CI. We need to repair this. JRA.
1560          */
1561
1562         for(i = 0; i < dacl->num_aces; i++) {
1563                 SEC_ACE *psa1 = &dacl->aces[i];
1564
1565                 for (j = i + 1; j < dacl->num_aces; j++) {
1566                         SEC_ACE *psa2 = &dacl->aces[j];
1567
1568                         if (psa1->access_mask != psa2->access_mask)
1569                                 continue;
1570
1571                         if (!sid_equal(&psa1->trustee, &psa2->trustee))
1572                                 continue;
1573
1574                         /*
1575                          * Ok - permission bits and SIDs are equal.
1576                          * Check if flags were re-written.
1577                          */
1578
1579                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1580
1581                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1582                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1583
1584                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1585
1586                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1587                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1588
1589                         }
1590                 }
1591         }
1592
1593         for(i = 0; i < dacl->num_aces; i++) {
1594                 SEC_ACE *psa = &dacl->aces[i];
1595
1596                 /*
1597                  * Create a cannon_ace entry representing this NT DACL ACE.
1598                  */
1599
1600                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1601                         free_canon_ace_list(file_ace);
1602                         free_canon_ace_list(dir_ace);
1603                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1604                         return False;
1605                 }
1606
1607                 ZERO_STRUCTP(current_ace);
1608
1609                 sid_copy(&current_ace->trustee, &psa->trustee);
1610
1611                 /*
1612                  * Try and work out if the SID is a user or group
1613                  * as we need to flag these differently for POSIX.
1614                  * Note what kind of a POSIX ACL this should map to.
1615                  */
1616
1617                 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1618                         current_ace->owner_type = WORLD_ACE;
1619                         current_ace->unix_ug.world = -1;
1620                         current_ace->type = SMB_ACL_OTHER;
1621                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1622                         current_ace->owner_type = UID_ACE;
1623                         current_ace->unix_ug.uid = pst->st_uid;
1624                         current_ace->type = SMB_ACL_USER_OBJ;
1625
1626                         /*
1627                          * The Creator Owner entry only specifies inheritable permissions,
1628                          * never access permissions. WinNT doesn't always set the ACE to
1629                          *INHERIT_ONLY, though.
1630                          */
1631
1632                         if (nt4_compatible_acls())
1633                                 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1634                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1635                         current_ace->owner_type = GID_ACE;
1636                         current_ace->unix_ug.gid = pst->st_gid;
1637                         current_ace->type = SMB_ACL_GROUP_OBJ;
1638
1639                         /*
1640                          * The Creator Group entry only specifies inheritable permissions,
1641                          * never access permissions. WinNT doesn't always set the ACE to
1642                          *INHERIT_ONLY, though.
1643                          */
1644                         if (nt4_compatible_acls())
1645                                 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1646
1647                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1648                         current_ace->owner_type = UID_ACE;
1649                         /* If it's the owning user, this is a user_obj, not
1650                          * a user. */
1651                         if (current_ace->unix_ug.uid == pst->st_uid) {
1652                                 current_ace->type = SMB_ACL_USER_OBJ;
1653                         } else {
1654                                 current_ace->type = SMB_ACL_USER;
1655                         }
1656                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1657                         current_ace->owner_type = GID_ACE;
1658                         /* If it's the primary group, this is a group_obj, not
1659                          * a group. */
1660                         if (current_ace->unix_ug.gid == pst->st_gid) {
1661                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1662                         } else {
1663                                 current_ace->type = SMB_ACL_GROUP;
1664                         }
1665                 } else {
1666                         /*
1667                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1668                          */
1669
1670                         if (non_mappable_sid(&psa->trustee)) {
1671                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1672                                            "non-mappable SID %s\n",
1673                                            sid_string_dbg(&psa->trustee)));
1674                                 SAFE_FREE(current_ace);
1675                                 continue;
1676                         }
1677
1678                         free_canon_ace_list(file_ace);
1679                         free_canon_ace_list(dir_ace);
1680                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1681                                   "%s to uid or gid.\n",
1682                                   sid_string_dbg(&current_ace->trustee)));
1683                         SAFE_FREE(current_ace);
1684                         return False;
1685                 }
1686
1687                 /*
1688                  * Map the given NT permissions into a UNIX mode_t containing only
1689                  * S_I(R|W|X)USR bits.
1690                  */
1691
1692                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1693                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1694
1695                 /* Store the ace_flag. */
1696                 current_ace->ace_flags = psa->flags;
1697
1698                 /*
1699                  * Now add the created ace to either the file list, the directory
1700                  * list, or both. We *MUST* preserve the order here (hence we use
1701                  * DLIST_ADD_END) as NT ACLs are order dependent.
1702                  */
1703
1704                 if (fsp->is_directory) {
1705
1706                         /*
1707                          * We can only add to the default POSIX ACE list if the ACE is
1708                          * designed to be inherited by both files and directories.
1709                          */
1710
1711                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1712                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1713
1714                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1715
1716                                 /*
1717                                  * Note if this was an allow ace. We can't process
1718                                  * any further deny ace's after this.
1719                                  */
1720
1721                                 if (current_ace->attr == ALLOW_ACE)
1722                                         got_dir_allow = True;
1723
1724                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1725                                         DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1726 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1727                                         free_canon_ace_list(file_ace);
1728                                         free_canon_ace_list(dir_ace);
1729                                         return False;
1730                                 }
1731
1732                                 if( DEBUGLVL( 10 )) {
1733                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1734                                         print_canon_ace( current_ace, 0);
1735                                 }
1736
1737                                 /*
1738                                  * If this is not an inherit only ACE we need to add a duplicate
1739                                  * to the file acl.
1740                                  */
1741
1742                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1743                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1744
1745                                         if (!dup_ace) {
1746                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1747                                                 free_canon_ace_list(file_ace);
1748                                                 free_canon_ace_list(dir_ace);
1749                                                 return False;
1750                                         }
1751
1752                                         /*
1753                                          * We must not free current_ace here as its
1754                                          * pointer is now owned by the dir_ace list.
1755                                          */
1756                                         current_ace = dup_ace;
1757                                 } else {
1758                                         /*
1759                                          * We must not free current_ace here as its
1760                                          * pointer is now owned by the dir_ace list.
1761                                          */
1762                                         current_ace = NULL;
1763                                 }
1764                         }
1765                 }
1766
1767                 /*
1768                  * Only add to the file ACL if not inherit only.
1769                  */
1770
1771                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1772                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1773
1774                         /*
1775                          * Note if this was an allow ace. We can't process
1776                          * any further deny ace's after this.
1777                          */
1778
1779                         if (current_ace->attr == ALLOW_ACE)
1780                                 got_file_allow = True;
1781
1782                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1783                                 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1784 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1785                                 free_canon_ace_list(file_ace);
1786                                 free_canon_ace_list(dir_ace);
1787                                 return False;
1788                         }
1789
1790                         if( DEBUGLVL( 10 )) {
1791                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1792                                 print_canon_ace( current_ace, 0);
1793                         }
1794                         all_aces_are_inherit_only = False;
1795                         /*
1796                          * We must not free current_ace here as its
1797                          * pointer is now owned by the file_ace list.
1798                          */
1799                         current_ace = NULL;
1800                 }
1801
1802                 /*
1803                  * Free if ACE was not added.
1804                  */
1805
1806                 SAFE_FREE(current_ace);
1807         }
1808
1809         if (fsp->is_directory && all_aces_are_inherit_only) {
1810                 /*
1811                  * Windows 2000 is doing one of these weird 'inherit acl'
1812                  * traverses to conserve NTFS ACL resources. Just pretend
1813                  * there was no DACL sent. JRA.
1814                  */
1815
1816                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1817                 free_canon_ace_list(file_ace);
1818                 free_canon_ace_list(dir_ace);
1819                 file_ace = NULL;
1820                 dir_ace = NULL;
1821         } else {
1822                 /*
1823                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1824                  * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1825                  * entries can be converted to *_OBJ. Usually we will already have these
1826                  * entries in the Default ACL, and the Access ACL will not have them.
1827                  */
1828                 if (file_ace) {
1829                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1830                 }
1831                 if (dir_ace) {
1832                         check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1833                 }
1834         }
1835
1836         *ppfile_ace = file_ace;
1837         *ppdir_ace = dir_ace;
1838
1839         return True;
1840 }
1841
1842 /****************************************************************************
1843  ASCII art time again... JRA :-).
1844
1845  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1846  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1847  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1848  allow or deny have been merged, so the same SID can only appear once in the deny
1849  list or once in the allow list.
1850
1851  We then process as follows :
1852
1853  ---------------------------------------------------------------------------
1854  First pass - look for a Everyone DENY entry.
1855
1856  If it is deny all (rwx) trunate the list at this point.
1857  Else, walk the list from this point and use the deny permissions of this
1858  entry as a mask on all following allow entries. Finally, delete
1859  the Everyone DENY entry (we have applied it to everything possible).
1860
1861  In addition, in this pass we remove any DENY entries that have
1862  no permissions (ie. they are a DENY nothing).
1863  ---------------------------------------------------------------------------
1864  Second pass - only deal with deny user entries.
1865
1866  DENY user1 (perms XXX)
1867
1868  new_perms = 0
1869  for all following allow group entries where user1 is in group
1870         new_perms |= group_perms;
1871
1872  user1 entry perms = new_perms & ~ XXX;
1873
1874  Convert the deny entry to an allow entry with the new perms and
1875  push to the end of the list. Note if the user was in no groups
1876  this maps to a specific allow nothing entry for this user.
1877
1878  The common case from the NT ACL choser (userX deny all) is
1879  optimised so we don't do the group lookup - we just map to
1880  an allow nothing entry.
1881
1882  What we're doing here is inferring the allow permissions the
1883  person setting the ACE on user1 wanted by looking at the allow
1884  permissions on the groups the user is currently in. This will
1885  be a snapshot, depending on group membership but is the best
1886  we can do and has the advantage of failing closed rather than
1887  open.
1888  ---------------------------------------------------------------------------
1889  Third pass - only deal with deny group entries.
1890
1891  DENY group1 (perms XXX)
1892
1893  for all following allow user entries where user is in group1
1894    user entry perms = user entry perms & ~ XXX;
1895
1896  If there is a group Everyone allow entry with permissions YYY,
1897  convert the group1 entry to an allow entry and modify its
1898  permissions to be :
1899
1900  new_perms = YYY & ~ XXX
1901
1902  and push to the end of the list.
1903
1904  If there is no group Everyone allow entry then convert the
1905  group1 entry to a allow nothing entry and push to the end of the list.
1906
1907  Note that the common case from the NT ACL choser (groupX deny all)
1908  cannot be optimised here as we need to modify user entries who are
1909  in the group to change them to a deny all also.
1910
1911  What we're doing here is modifying the allow permissions of
1912  user entries (which are more specific in POSIX ACLs) to mask
1913  out the explicit deny set on the group they are in. This will
1914  be a snapshot depending on current group membership but is the
1915  best we can do and has the advantage of failing closed rather
1916  than open.
1917  ---------------------------------------------------------------------------
1918  Fourth pass - cope with cumulative permissions.
1919
1920  for all allow user entries, if there exists an allow group entry with
1921  more permissive permissions, and the user is in that group, rewrite the
1922  allow user permissions to contain both sets of permissions.
1923
1924  Currently the code for this is #ifdef'ed out as these semantics make
1925  no sense to me. JRA.
1926  ---------------------------------------------------------------------------
1927
1928  Note we *MUST* do the deny user pass first as this will convert deny user
1929  entries into allow user entries which can then be processed by the deny
1930  group pass.
1931
1932  The above algorithm took a *lot* of thinking about - hence this
1933  explaination :-). JRA.
1934 ****************************************************************************/
1935
1936 /****************************************************************************
1937  Process a canon_ace list entries. This is very complex code. We need
1938  to go through and remove the "deny" permissions from any allow entry that matches
1939  the id of this entry. We have already refused any NT ACL that wasn't in correct
1940  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1941  we just remove it (to fail safe). We have already removed any duplicate ace
1942  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1943  allow entries.
1944 ****************************************************************************/
1945
1946 static void process_deny_list( canon_ace **pp_ace_list )
1947 {
1948         canon_ace *ace_list = *pp_ace_list;
1949         canon_ace *curr_ace = NULL;
1950         canon_ace *curr_ace_next = NULL;
1951
1952         /* Pass 1 above - look for an Everyone, deny entry. */
1953
1954         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1955                 canon_ace *allow_ace_p;
1956
1957                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1958
1959                 if (curr_ace->attr != DENY_ACE)
1960                         continue;
1961
1962                 if (curr_ace->perms == (mode_t)0) {
1963
1964                         /* Deny nothing entry - delete. */
1965
1966                         DLIST_REMOVE(ace_list, curr_ace);
1967                         continue;
1968                 }
1969
1970                 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1971                         continue;
1972
1973                 /* JRATEST - assert. */
1974                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1975
1976                 if (curr_ace->perms == ALL_ACE_PERMS) {
1977
1978                         /*
1979                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1980                          * list at this point including this entry.
1981                          */
1982
1983                         canon_ace *prev_entry = curr_ace->prev;
1984
1985                         free_canon_ace_list( curr_ace );
1986                         if (prev_entry)
1987                                 prev_entry->next = NULL;
1988                         else {
1989                                 /* We deleted the entire list. */
1990                                 ace_list = NULL;
1991                         }
1992                         break;
1993                 }
1994
1995                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1996
1997                         /*
1998                          * Only mask off allow entries.
1999                          */
2000
2001                         if (allow_ace_p->attr != ALLOW_ACE)
2002                                 continue;
2003
2004                         allow_ace_p->perms &= ~curr_ace->perms;
2005                 }
2006
2007                 /*
2008                  * Now it's been applied, remove it.
2009                  */
2010
2011                 DLIST_REMOVE(ace_list, curr_ace);
2012         }
2013
2014         /* Pass 2 above - deal with deny user entries. */
2015
2016         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2017                 mode_t new_perms = (mode_t)0;
2018                 canon_ace *allow_ace_p;
2019
2020                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2021
2022                 if (curr_ace->attr != DENY_ACE)
2023                         continue;
2024
2025                 if (curr_ace->owner_type != UID_ACE)
2026                         continue;
2027
2028                 if (curr_ace->perms == ALL_ACE_PERMS) {
2029
2030                         /*
2031                          * Optimisation - this is a deny everything to this user.
2032                          * Convert to an allow nothing and push to the end of the list.
2033                          */
2034
2035                         curr_ace->attr = ALLOW_ACE;
2036                         curr_ace->perms = (mode_t)0;
2037                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2038                         continue;
2039                 }
2040
2041                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2042
2043                         if (allow_ace_p->attr != ALLOW_ACE)
2044                                 continue;
2045
2046                         /* We process GID_ACE and WORLD_ACE entries only. */
2047
2048                         if (allow_ace_p->owner_type == UID_ACE)
2049                                 continue;
2050
2051                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2052                                 new_perms |= allow_ace_p->perms;
2053                 }
2054
2055                 /*
2056                  * Convert to a allow entry, modify the perms and push to the end
2057                  * of the list.
2058                  */
2059
2060                 curr_ace->attr = ALLOW_ACE;
2061                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2062                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2063         }
2064
2065         /* Pass 3 above - deal with deny group entries. */
2066
2067         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2068                 canon_ace *allow_ace_p;
2069                 canon_ace *allow_everyone_p = NULL;
2070
2071                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2072
2073                 if (curr_ace->attr != DENY_ACE)
2074                         continue;
2075
2076                 if (curr_ace->owner_type != GID_ACE)
2077                         continue;
2078
2079                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2080
2081                         if (allow_ace_p->attr != ALLOW_ACE)
2082                                 continue;
2083
2084                         /* Store a pointer to the Everyone allow, if it exists. */
2085                         if (allow_ace_p->owner_type == WORLD_ACE)
2086                                 allow_everyone_p = allow_ace_p;
2087
2088                         /* We process UID_ACE entries only. */
2089
2090                         if (allow_ace_p->owner_type != UID_ACE)
2091                                 continue;
2092
2093                         /* Mask off the deny group perms. */
2094
2095                         if (uid_entry_in_group( allow_ace_p, curr_ace))
2096                                 allow_ace_p->perms &= ~curr_ace->perms;
2097                 }
2098
2099                 /*
2100                  * Convert the deny to an allow with the correct perms and
2101                  * push to the end of the list.
2102                  */
2103
2104                 curr_ace->attr = ALLOW_ACE;
2105                 if (allow_everyone_p)
2106                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2107                 else
2108                         curr_ace->perms = (mode_t)0;
2109                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2110         }
2111
2112         /* Doing this fourth pass allows Windows semantics to be layered
2113          * on top of POSIX semantics. I'm not sure if this is desirable.
2114          * For example, in W2K ACLs there is no way to say, "Group X no
2115          * access, user Y full access" if user Y is a member of group X.
2116          * This seems completely broken semantics to me.... JRA.
2117          */
2118
2119 #if 0
2120         /* Pass 4 above - deal with allow entries. */
2121
2122         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2123                 canon_ace *allow_ace_p;
2124
2125                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2126
2127                 if (curr_ace->attr != ALLOW_ACE)
2128                         continue;
2129
2130                 if (curr_ace->owner_type != UID_ACE)
2131                         continue;
2132
2133                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2134
2135                         if (allow_ace_p->attr != ALLOW_ACE)
2136                                 continue;
2137
2138                         /* We process GID_ACE entries only. */
2139
2140                         if (allow_ace_p->owner_type != GID_ACE)
2141                                 continue;
2142
2143                         /* OR in the group perms. */
2144
2145                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2146                                 curr_ace->perms |= allow_ace_p->perms;
2147                 }
2148         }
2149 #endif
2150
2151         *pp_ace_list = ace_list;
2152 }
2153
2154 /****************************************************************************
2155  Create a default mode that will be used if a security descriptor entry has
2156  no user/group/world entries.
2157 ****************************************************************************/
2158
2159 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2160 {
2161         int snum = SNUM(fsp->conn);
2162         mode_t and_bits = (mode_t)0;
2163         mode_t or_bits = (mode_t)0;
2164         mode_t mode = interitable_mode
2165                 ? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name,
2166                              NULL )
2167                 : S_IRUSR;
2168
2169         if (fsp->is_directory)
2170                 mode |= (S_IWUSR|S_IXUSR);
2171
2172         /*
2173          * Now AND with the create mode/directory mode bits then OR with the
2174          * force create mode/force directory mode bits.
2175          */
2176
2177         if (fsp->is_directory) {
2178                 and_bits = lp_dir_security_mask(snum);
2179                 or_bits = lp_force_dir_security_mode(snum);
2180         } else {
2181                 and_bits = lp_security_mask(snum);
2182                 or_bits = lp_force_security_mode(snum);
2183         }
2184
2185         return ((mode & and_bits)|or_bits);
2186 }
2187
2188 /****************************************************************************
2189  Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2190  succeeding.
2191 ****************************************************************************/
2192
2193 static bool unpack_canon_ace(files_struct *fsp,
2194                                 SMB_STRUCT_STAT *pst,
2195                                 DOM_SID *pfile_owner_sid,
2196                                 DOM_SID *pfile_grp_sid,
2197                                 canon_ace **ppfile_ace,
2198                                 canon_ace **ppdir_ace,
2199                                 uint32 security_info_sent,
2200                                 const SEC_DESC *psd)
2201 {
2202         canon_ace *file_ace = NULL;
2203         canon_ace *dir_ace = NULL;
2204
2205         *ppfile_ace = NULL;
2206         *ppdir_ace = NULL;
2207
2208         if(security_info_sent == 0) {
2209                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2210                 return False;
2211         }
2212
2213         /*
2214          * If no DACL then this is a chown only security descriptor.
2215          */
2216
2217         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2218                 return True;
2219
2220         /*
2221          * Now go through the DACL and create the canon_ace lists.
2222          */
2223
2224         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2225                                                                 &file_ace, &dir_ace, psd->dacl))
2226                 return False;
2227
2228         if ((file_ace == NULL) && (dir_ace == NULL)) {
2229                 /* W2K traverse DACL set - ignore. */
2230                 return True;
2231         }
2232
2233         /*
2234          * Go through the canon_ace list and merge entries
2235          * belonging to identical users of identical allow or deny type.
2236          * We can do this as all deny entries come first, followed by
2237          * all allow entries (we have mandated this before accepting this acl).
2238          */
2239
2240         print_canon_ace_list( "file ace - before merge", file_ace);
2241         merge_aces( &file_ace );
2242
2243         print_canon_ace_list( "dir ace - before merge", dir_ace);
2244         merge_aces( &dir_ace );
2245
2246         /*
2247          * NT ACLs are order dependent. Go through the acl lists and
2248          * process DENY entries by masking the allow entries.
2249          */
2250
2251         print_canon_ace_list( "file ace - before deny", file_ace);
2252         process_deny_list( &file_ace);
2253
2254         print_canon_ace_list( "dir ace - before deny", dir_ace);
2255         process_deny_list( &dir_ace);
2256
2257         /*
2258          * A well formed POSIX file or default ACL has at least 3 entries, a
2259          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2260          * and optionally a mask entry. Ensure this is the case.
2261          */
2262
2263         print_canon_ace_list( "file ace - before valid", file_ace);
2264
2265         /*
2266          * A default 3 element mode entry for a file should be r-- --- ---.
2267          * A default 3 element mode entry for a directory should be rwx --- ---.
2268          */
2269
2270         pst->st_mode = create_default_mode(fsp, False);
2271
2272         if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2273                 free_canon_ace_list(file_ace);
2274                 free_canon_ace_list(dir_ace);
2275                 return False;
2276         }
2277
2278         print_canon_ace_list( "dir ace - before valid", dir_ace);
2279
2280         /*
2281          * A default inheritable 3 element mode entry for a directory should be the
2282          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2283          * it's a directory.
2284          */
2285
2286         pst->st_mode = create_default_mode(fsp, True);
2287
2288         if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2289                 free_canon_ace_list(file_ace);
2290                 free_canon_ace_list(dir_ace);
2291                 return False;
2292         }
2293
2294         print_canon_ace_list( "file ace - return", file_ace);
2295         print_canon_ace_list( "dir ace - return", dir_ace);
2296
2297         *ppfile_ace = file_ace;
2298         *ppdir_ace = dir_ace;
2299         return True;
2300
2301 }
2302
2303 /******************************************************************************
2304  When returning permissions, try and fit NT display
2305  semantics if possible. Note the the canon_entries here must have been malloced.
2306  The list format should be - first entry = owner, followed by group and other user
2307  entries, last entry = other.
2308
2309  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2310  are not ordered, and match on the most specific entry rather than walking a list,
2311  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2312
2313  Entry 0: owner : deny all except read and write.
2314  Entry 1: owner : allow read and write.
2315  Entry 2: group : deny all except read.
2316  Entry 3: group : allow read.
2317  Entry 4: Everyone : allow read.
2318
2319  But NT cannot display this in their ACL editor !
2320 ********************************************************************************/
2321
2322 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2323 {
2324         canon_ace *l_head = *pp_list_head;
2325         canon_ace *owner_ace = NULL;
2326         canon_ace *other_ace = NULL;
2327         canon_ace *ace = NULL;
2328
2329         for (ace = l_head; ace; ace = ace->next) {
2330                 if (ace->type == SMB_ACL_USER_OBJ)
2331                         owner_ace = ace;
2332                 else if (ace->type == SMB_ACL_OTHER) {
2333                         /* Last ace - this is "other" */
2334                         other_ace = ace;
2335                 }
2336         }
2337
2338         if (!owner_ace || !other_ace) {
2339                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2340                         filename ));
2341                 return;
2342         }
2343
2344         /*
2345          * The POSIX algorithm applies to owner first, and other last,
2346          * so ensure they are arranged in this order.
2347          */
2348
2349         if (owner_ace) {
2350                 DLIST_PROMOTE(l_head, owner_ace);
2351         }
2352
2353         if (other_ace) {
2354                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2355         }
2356
2357         /* We have probably changed the head of the list. */
2358
2359         *pp_list_head = l_head;
2360 }
2361
2362 /****************************************************************************
2363  Create a linked list of canonical ACE entries.
2364 ****************************************************************************/
2365
2366 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2367                                    const char *fname, SMB_ACL_T posix_acl,
2368                                    const SMB_STRUCT_STAT *psbuf,
2369                                    const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2370 {
2371         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2372         canon_ace *l_head = NULL;
2373         canon_ace *ace = NULL;
2374         canon_ace *next_ace = NULL;
2375         int entry_id = SMB_ACL_FIRST_ENTRY;
2376         SMB_ACL_ENTRY_T entry;
2377         size_t ace_count;
2378
2379         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2380                 SMB_ACL_TAG_T tagtype;
2381                 SMB_ACL_PERMSET_T permset;
2382                 DOM_SID sid;
2383                 posix_id unix_ug;
2384                 enum ace_owner owner_type;
2385
2386                 entry_id = SMB_ACL_NEXT_ENTRY;
2387
2388                 /* Is this a MASK entry ? */
2389                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2390                         continue;
2391
2392                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2393                         continue;
2394
2395                 /* Decide which SID to use based on the ACL type. */
2396                 switch(tagtype) {
2397                         case SMB_ACL_USER_OBJ:
2398                                 /* Get the SID from the owner. */
2399                                 sid_copy(&sid, powner);
2400                                 unix_ug.uid = psbuf->st_uid;
2401                                 owner_type = UID_ACE;
2402                                 break;
2403                         case SMB_ACL_USER:
2404                                 {
2405                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2406                                         if (puid == NULL) {
2407                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2408                                                 continue;
2409                                         }
2410                                         /*
2411                                          * A SMB_ACL_USER entry for the owner is shadowed by the
2412                                          * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2413                                          * that entry, so we ignore it. We also don't create such
2414                                          * entries out of the blue when setting ACLs, so a get/set
2415                                          * cycle will drop them.
2416                                          */
2417                                         if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_uid) {
2418                                                 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2419                                                 continue;
2420                                         }
2421                                         uid_to_sid( &sid, *puid);
2422                                         unix_ug.uid = *puid;
2423                                         owner_type = UID_ACE;
2424                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2425                                         break;
2426                                 }
2427                         case SMB_ACL_GROUP_OBJ:
2428                                 /* Get the SID from the owning group. */
2429                                 sid_copy(&sid, pgroup);
2430                                 unix_ug.gid = psbuf->st_gid;
2431                                 owner_type = GID_ACE;
2432                                 break;
2433                         case SMB_ACL_GROUP:
2434                                 {
2435                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2436                                         if (pgid == NULL) {
2437                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2438                                                 continue;
2439                                         }
2440                                         gid_to_sid( &sid, *pgid);
2441                                         unix_ug.gid = *pgid;
2442                                         owner_type = GID_ACE;
2443                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2444                                         break;
2445                                 }
2446                         case SMB_ACL_MASK:
2447                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2448                                 continue; /* Don't count the mask as an entry. */
2449                         case SMB_ACL_OTHER:
2450                                 /* Use the Everyone SID */
2451                                 sid = global_sid_World;
2452                                 unix_ug.world = -1;
2453                                 owner_type = WORLD_ACE;
2454                                 break;
2455                         default:
2456                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2457                                 continue;
2458                 }
2459
2460                 /*
2461                  * Add this entry to the list.
2462                  */
2463
2464                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2465                         goto fail;
2466
2467                 ZERO_STRUCTP(ace);
2468                 ace->type = tagtype;
2469                 ace->perms = convert_permset_to_mode_t(conn, permset);
2470                 ace->attr = ALLOW_ACE;
2471                 ace->trustee = sid;
2472                 ace->unix_ug = unix_ug;
2473                 ace->owner_type = owner_type;
2474                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2475
2476                 DLIST_ADD(l_head, ace);
2477         }
2478
2479         /*
2480          * This next call will ensure we have at least a user/group/world set.
2481          */
2482
2483         if (!ensure_canon_entry_valid(&l_head, conn->params,
2484                                       S_ISDIR(psbuf->st_mode), powner, pgroup,
2485                                       psbuf, False))
2486                 goto fail;
2487
2488         /*
2489          * Now go through the list, masking the permissions with the
2490          * acl_mask. Ensure all DENY Entries are at the start of the list.
2491          */
2492
2493         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2494
2495         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2496                 next_ace = ace->next;
2497
2498                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2499                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2500                         ace->perms &= acl_mask;
2501
2502                 if (ace->perms == 0) {
2503                         DLIST_PROMOTE(l_head, ace);
2504                 }
2505
2506                 if( DEBUGLVL( 10 ) ) {
2507                         print_canon_ace(ace, ace_count);
2508                 }
2509         }
2510
2511         arrange_posix_perms(fname,&l_head );
2512
2513         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2514
2515         return l_head;
2516
2517   fail:
2518
2519         free_canon_ace_list(l_head);
2520         return NULL;
2521 }
2522
2523 /****************************************************************************
2524  Check if the current user group list contains a given group.
2525 ****************************************************************************/
2526
2527 static bool current_user_in_group(gid_t gid)
2528 {
2529         int i;
2530
2531         for (i = 0; i < current_user.ut.ngroups; i++) {
2532                 if (current_user.ut.groups[i] == gid) {
2533                         return True;
2534                 }
2535         }
2536
2537         return False;
2538 }
2539
2540 /****************************************************************************
2541  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2542 ****************************************************************************/
2543
2544 static bool acl_group_override(connection_struct *conn,
2545                                 gid_t prim_gid,
2546                                 const char *fname)
2547 {
2548         SMB_STRUCT_STAT sbuf;
2549
2550         if ((errno != EPERM) && (errno != EACCES)) {
2551                 return false;
2552         }
2553
2554         /* file primary group == user primary or supplementary group */
2555         if (lp_acl_group_control(SNUM(conn)) &&
2556                         current_user_in_group(prim_gid)) {
2557                 return true;
2558         }
2559
2560         /* user has writeable permission */
2561         if (lp_dos_filemode(SNUM(conn)) &&
2562                         can_write_to_file(conn, fname, &sbuf)) {
2563                 return true;
2564         }
2565
2566         return false;
2567 }
2568
2569 /****************************************************************************
2570  Attempt to apply an ACL to a file or directory.
2571 ****************************************************************************/
2572
2573 static bool set_canon_ace_list(files_struct *fsp, canon_ace *the_ace, bool default_ace, gid_t prim_gid, bool *pacl_set_support)
2574 {
2575         connection_struct *conn = fsp->conn;
2576         bool ret = False;
2577         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2578         canon_ace *p_ace;
2579         int i;
2580         SMB_ACL_ENTRY_T mask_entry;
2581         bool got_mask_entry = False;
2582         SMB_ACL_PERMSET_T mask_permset;
2583         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2584         bool needs_mask = False;
2585         mode_t mask_perms = 0;
2586
2587 #if defined(POSIX_ACL_NEEDS_MASK)
2588         /* HP-UX always wants to have a mask (called "class" there). */
2589         needs_mask = True;
2590 #endif
2591
2592         if (the_acl == NULL) {
2593
2594                 if (!no_acl_syscall_error(errno)) {
2595                         /*
2596                          * Only print this error message if we have some kind of ACL
2597                          * support that's not working. Otherwise we would always get this.
2598                          */
2599                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2600                                 default_ace ? "default" : "file", strerror(errno) ));
2601                 }
2602                 *pacl_set_support = False;
2603                 return False;
2604         }
2605
2606         if( DEBUGLVL( 10 )) {
2607                 dbgtext("set_canon_ace_list: setting ACL:\n");
2608                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2609                         print_canon_ace( p_ace, i);
2610                 }
2611         }
2612
2613         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2614                 SMB_ACL_ENTRY_T the_entry;
2615                 SMB_ACL_PERMSET_T the_permset;
2616
2617                 /*
2618                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2619                  * named group entries. But if there is an ACL_MASK entry, it applies
2620                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2621                  * so that it doesn't deny (i.e., mask off) any permissions.
2622                  */
2623
2624                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2625                         needs_mask = True;
2626                         mask_perms |= p_ace->perms;
2627                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2628                         mask_perms |= p_ace->perms;
2629                 }
2630
2631                 /*
2632                  * Get the entry for this ACE.
2633                  */
2634
2635                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2636                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2637                                 i, strerror(errno) ));
2638                         goto fail;
2639                 }
2640
2641                 if (p_ace->type == SMB_ACL_MASK) {
2642                         mask_entry = the_entry;
2643                         got_mask_entry = True;
2644                 }
2645
2646                 /*
2647                  * Ok - we now know the ACL calls should be working, don't
2648                  * allow fallback to chmod.
2649                  */
2650
2651                 *pacl_set_support = True;
2652
2653                 /*
2654                  * Initialise the entry from the canon_ace.
2655                  */
2656
2657                 /*
2658                  * First tell the entry what type of ACE this is.
2659                  */
2660
2661                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2662                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2663                                 i, strerror(errno) ));
2664                         goto fail;
2665                 }
2666
2667                 /*
2668                  * Only set the qualifier (user or group id) if the entry is a user
2669                  * or group id ACE.
2670                  */
2671
2672                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2673                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2674                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2675                                         i, strerror(errno) ));
2676                                 goto fail;
2677                         }
2678                 }
2679
2680                 /*
2681                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2682                  */
2683
2684                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2685                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2686                                 i, strerror(errno) ));
2687                         goto fail;
2688                 }
2689
2690                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2691                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2692                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2693                         goto fail;
2694                 }
2695
2696                 /*
2697                  * ..and apply them to the entry.
2698                  */
2699
2700                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2701                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2702                                 i, strerror(errno) ));
2703                         goto fail;
2704                 }
2705
2706                 if( DEBUGLVL( 10 ))
2707                         print_canon_ace( p_ace, i);
2708
2709         }
2710
2711         if (needs_mask && !got_mask_entry) {
2712                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2713                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2714                         goto fail;
2715                 }
2716
2717                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2718                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2719                         goto fail;
2720                 }
2721
2722                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2723                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2724                         goto fail;
2725                 }
2726
2727                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2728                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2729                         goto fail;
2730                 }
2731
2732                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2733                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2734                         goto fail;
2735                 }
2736         }
2737
2738         /*
2739          * Finally apply it to the file or directory.
2740          */
2741
2742         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2743                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2744                         /*
2745                          * Some systems allow all the above calls and only fail with no ACL support
2746                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2747                          */
2748                         if (no_acl_syscall_error(errno)) {
2749                                 *pacl_set_support = False;
2750                         }
2751
2752                         if (acl_group_override(conn, prim_gid, fsp->fsp_name)) {
2753                                 int sret;
2754
2755                                 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2756                                         fsp->fsp_name ));
2757
2758                                 become_root();
2759                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl);
2760                                 unbecome_root();
2761                                 if (sret == 0) {
2762                                         ret = True;
2763                                 }
2764                         }
2765
2766                         if (ret == False) {
2767                                 DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2768                                                 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2769                                                 fsp->fsp_name, strerror(errno) ));
2770                                 goto fail;
2771                         }
2772                 }
2773         } else {
2774                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2775                         /*
2776                          * Some systems allow all the above calls and only fail with no ACL support
2777                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2778                          */
2779                         if (no_acl_syscall_error(errno)) {
2780                                 *pacl_set_support = False;
2781                         }
2782
2783                         if (acl_group_override(conn, prim_gid, fsp->fsp_name)) {
2784                                 int sret;
2785
2786                                 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2787                                         fsp->fsp_name ));
2788
2789                                 become_root();
2790                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2791                                 unbecome_root();
2792                                 if (sret == 0) {
2793                                         ret = True;
2794                                 }
2795                         }
2796
2797                         if (ret == False) {
2798                                 DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2799                                                 fsp->fsp_name, strerror(errno) ));
2800                                 goto fail;
2801                         }
2802                 }
2803         }
2804
2805         ret = True;
2806
2807   fail:
2808
2809         if (the_acl != NULL) {
2810                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2811         }
2812
2813         return ret;
2814 }
2815
2816 /****************************************************************************
2817  Find a particular canon_ace entry.
2818 ****************************************************************************/
2819
2820 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2821 {
2822         while (list) {
2823                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2824                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2825                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2826                         break;
2827                 list = list->next;
2828         }
2829         return list;
2830 }
2831
2832 /****************************************************************************
2833
2834 ****************************************************************************/
2835
2836 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2837 {
2838         SMB_ACL_ENTRY_T entry;
2839
2840         if (!the_acl)
2841                 return NULL;
2842         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2843                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2844                 return NULL;
2845         }
2846         return the_acl;
2847 }
2848
2849 /****************************************************************************
2850  Convert a canon_ace to a generic 3 element permission - if possible.
2851 ****************************************************************************/
2852
2853 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2854
2855 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2856 {
2857         int snum = SNUM(fsp->conn);
2858         size_t ace_count = count_canon_ace_list(file_ace_list);
2859         canon_ace *ace_p;
2860         canon_ace *owner_ace = NULL;
2861         canon_ace *group_ace = NULL;
2862         canon_ace *other_ace = NULL;
2863         mode_t and_bits;
2864         mode_t or_bits;
2865
2866         if (ace_count != 3) {
2867                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2868 posix perms.\n", fsp->fsp_name ));
2869                 return False;
2870         }
2871
2872         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2873                 if (ace_p->owner_type == UID_ACE)
2874                         owner_ace = ace_p;
2875                 else if (ace_p->owner_type == GID_ACE)
2876                         group_ace = ace_p;
2877                 else if (ace_p->owner_type == WORLD_ACE)
2878                         other_ace = ace_p;
2879         }
2880
2881         if (!owner_ace || !group_ace || !other_ace) {
2882                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2883                                 fsp->fsp_name ));
2884                 return False;
2885         }
2886
2887         *posix_perms = (mode_t)0;
2888
2889         *posix_perms |= owner_ace->perms;
2890         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2891         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2892         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2893         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2894         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2895         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2896
2897         /* The owner must have at least read access. */
2898
2899         *posix_perms |= S_IRUSR;
2900         if (fsp->is_directory)
2901                 *posix_perms |= (S_IWUSR|S_IXUSR);
2902
2903         /* If requested apply the masks. */
2904
2905         /* Get the initial bits to apply. */
2906
2907         if (fsp->is_directory) {
2908                 and_bits = lp_dir_security_mask(snum);
2909                 or_bits = lp_force_dir_security_mode(snum);
2910         } else {
2911                 and_bits = lp_security_mask(snum);
2912                 or_bits = lp_force_security_mode(snum);
2913         }
2914
2915         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2916
2917         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2918                 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2919                 fsp->fsp_name ));
2920
2921         return True;
2922 }
2923
2924 /****************************************************************************
2925   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2926   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2927   with CI|OI set so it is inherited and also applies to the directory.
2928   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2929 ****************************************************************************/
2930
2931 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2932 {
2933         size_t i, j;
2934
2935         for (i = 0; i < num_aces; i++) {
2936                 for (j = i+1; j < num_aces; j++) {
2937                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2938                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2939                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2940                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2941
2942                         /* We know the lower number ACE's are file entries. */
2943                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2944                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2945                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2946                                 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2947                                 (i_inh == j_inh) &&
2948                                 (i_flags_ni == 0) &&
2949                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2950                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
2951                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
2952                                 /*
2953                                  * W2K wants to have access allowed zero access ACE's
2954                                  * at the end of the list. If the mask is zero, merge
2955                                  * the non-inherited ACE onto the inherited ACE.
2956                                  */
2957
2958                                 if (nt_ace_list[i].access_mask == 0) {
2959                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2960                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2961                                         if (num_aces - i - 1 > 0)
2962                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2963                                                                 sizeof(SEC_ACE));
2964
2965                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2966                                                 (unsigned int)i, (unsigned int)j ));
2967                                 } else {
2968                                         /*
2969                                          * These are identical except for the flags.
2970                                          * Merge the inherited ACE onto the non-inherited ACE.
2971                                          */
2972
2973                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2974                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2975                                         if (num_aces - j - 1 > 0)
2976                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
2977                                                                 sizeof(SEC_ACE));
2978
2979                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
2980                                                 (unsigned int)j, (unsigned int)i ));
2981                                 }
2982                                 num_aces--;
2983                                 break;
2984                         }
2985                 }
2986         }
2987
2988         return num_aces;
2989 }
2990
2991 /*
2992  * Add or Replace ACE entry.
2993  * In some cases we need to add a specific ACE for compatibility reasons.
2994  * When doing that we must make sure we are not actually creating a duplicate
2995  * entry. So we need to search whether an ACE entry already exist and eventually
2996  * replacce the access mask, or add a completely new entry if none was found.
2997  *
2998  * This function assumes the array has enough space to add a new entry without
2999  * any reallocation of memory.
3000  */
3001
3002 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3003                                 const DOM_SID *sid, enum security_ace_type type,
3004                                 uint32_t mask, uint8_t flags)
3005 {
3006         int i;
3007
3008         /* first search for a duplicate */
3009         for (i = 0; i < *num_aces; i++) {
3010                 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3011                     (nt_ace_list[i].flags == flags)) break;
3012         }
3013
3014         if (i < *num_aces) { /* found */
3015                 nt_ace_list[i].type = type;
3016                 nt_ace_list[i].access_mask = mask;
3017                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3018                            i, sid_string_dbg(sid), flags));
3019                 return;
3020         }
3021
3022         /* not found, append it */
3023         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3024 }
3025
3026
3027 /****************************************************************************
3028  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3029  the space for the return elements and returns the size needed to return the
3030  security descriptor. This should be the only external function needed for
3031  the UNIX style get ACL.
3032 ****************************************************************************/
3033
3034 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3035                                       const char *name,
3036                                       const SMB_STRUCT_STAT *sbuf,
3037                                       struct pai_val *pal,
3038                                       SMB_ACL_T posix_acl,
3039                                       SMB_ACL_T def_acl,
3040                                       uint32_t security_info,
3041                                       SEC_DESC **ppdesc)
3042 {
3043         DOM_SID owner_sid;
3044         DOM_SID group_sid;
3045         size_t sd_size = 0;
3046         SEC_ACL *psa = NULL;
3047         size_t num_acls = 0;
3048         size_t num_def_acls = 0;
3049         size_t num_aces = 0;
3050         canon_ace *file_ace = NULL;
3051         canon_ace *dir_ace = NULL;
3052         SEC_ACE *nt_ace_list = NULL;
3053         size_t num_profile_acls = 0;
3054         DOM_SID orig_owner_sid;
3055         SEC_DESC *psd = NULL;
3056         int i;
3057
3058         /*
3059          * Get the owner, group and world SIDs.
3060          */
3061
3062         create_file_sids(sbuf, &owner_sid, &group_sid);
3063
3064         if (lp_profile_acls(SNUM(conn))) {
3065                 /* For WXP SP1 the owner must be administrators. */
3066                 sid_copy(&orig_owner_sid, &owner_sid);
3067                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3068                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3069                 num_profile_acls = 3;
3070         }
3071
3072         if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3073
3074                 /*
3075                  * In the optimum case Creator Owner and Creator Group would be used for
3076                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3077                  * would lead to usability problems under Windows: The Creator entries
3078                  * are only available in browse lists of directories and not for files;
3079                  * additionally the identity of the owning group couldn't be determined.
3080                  * We therefore use those identities only for Default ACLs.
3081                  */
3082
3083                 /* Create the canon_ace lists. */
3084                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3085                                             &owner_sid, &group_sid, pal,
3086                                             SMB_ACL_TYPE_ACCESS);
3087
3088                 /* We must have *some* ACLS. */
3089
3090                 if (count_canon_ace_list(file_ace) == 0) {
3091                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3092                         goto done;
3093                 }
3094
3095                 if (S_ISDIR(sbuf->st_mode) && def_acl) {
3096                         dir_ace = canonicalise_acl(conn, name, def_acl,
3097                                                    sbuf,
3098                                                    &global_sid_Creator_Owner,
3099                                                    &global_sid_Creator_Group,
3100                                                    pal, SMB_ACL_TYPE_DEFAULT);
3101                 }
3102
3103                 /*
3104                  * Create the NT ACE list from the canonical ace lists.
3105                  */
3106
3107                 {
3108                         canon_ace *ace;
3109                         enum security_ace_type nt_acl_type;
3110
3111                         if (nt4_compatible_acls() && dir_ace) {
3112                                 /*
3113                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3114                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3115                                  * remove entries from the Access ACL if the
3116                                  * corresponding Default ACL entries have also been
3117                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3118                                  * are exceptions. We can do nothing
3119                                  * intelligent if the Default ACL contains entries that
3120                                  * are not also contained in the Access ACL, so this
3121                                  * case will still fail under NT 4.
3122                                  */
3123
3124                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3125                                 if (ace && !ace->perms) {
3126                                         DLIST_REMOVE(dir_ace, ace);
3127                                         SAFE_FREE(ace);
3128
3129                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3130                                         if (ace && !ace->perms) {
3131                                                 DLIST_REMOVE(file_ace, ace);
3132                                                 SAFE_FREE(ace);
3133                                         }
3134                                 }
3135
3136                                 /*
3137                                  * WinNT doesn't usually have Creator Group
3138                                  * in browse lists, so we send this entry to
3139                                  * WinNT even if it contains no relevant
3140                                  * permissions. Once we can add
3141                                  * Creator Group to browse lists we can
3142                                  * re-enable this.
3143                                  */
3144
3145 #if 0
3146                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3147                                 if (ace && !ace->perms) {
3148                                         DLIST_REMOVE(dir_ace, ace);
3149                                         SAFE_FREE(ace);
3150                                 }
3151 #endif
3152
3153                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3154                                 if (ace && !ace->perms) {
3155                                         DLIST_REMOVE(file_ace, ace);
3156                                         SAFE_FREE(ace);
3157                                 }
3158                         }
3159
3160                         num_acls = count_canon_ace_list(file_ace);
3161                         num_def_acls = count_canon_ace_list(dir_ace);
3162
3163                         /* Allocate the ace list. */
3164                         if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3165                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3166                                 goto done;
3167                         }
3168
3169                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3170
3171                         /*
3172                          * Create the NT ACE list from the canonical ace lists.
3173                          */
3174
3175                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3176                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3177                                                 &nt_acl_type,
3178                                                 ace->perms,
3179                                                 S_ISDIR(sbuf->st_mode));
3180                                 init_sec_ace(&nt_ace_list[num_aces++],
3181                                         &ace->trustee,
3182                                         nt_acl_type,
3183                                         acc,
3184                                         ace->ace_flags);
3185                         }
3186
3187                         /* The User must have access to a profile share - even
3188                          * if we can't map the SID. */
3189                         if (lp_profile_acls(SNUM(conn))) {
3190                                 add_or_replace_ace(nt_ace_list, &num_aces,
3191                                                    &global_sid_Builtin_Users,
3192                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3193                                                    FILE_GENERIC_ALL, 0);
3194                         }
3195
3196                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3197                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3198                                                 &nt_acl_type,
3199                                                 ace->perms,
3200                                                 S_ISDIR(sbuf->st_mode));
3201                                 init_sec_ace(&nt_ace_list[num_aces++],
3202                                         &ace->trustee,
3203                                         nt_acl_type,
3204                                         acc,
3205                                         ace->ace_flags |
3206                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3207                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3208                                         SEC_ACE_FLAG_INHERIT_ONLY);
3209                         }
3210
3211                         /* The User must have access to a profile share - even
3212                          * if we can't map the SID. */
3213                         if (lp_profile_acls(SNUM(conn))) {
3214                                 add_or_replace_ace(nt_ace_list, &num_aces,
3215                                                 &global_sid_Builtin_Users,
3216                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3217                                                 FILE_GENERIC_ALL,
3218                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3219                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3220                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3221                         }
3222
3223                         /*
3224                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3225                          * Win2K needs this to get the inheritance correct when replacing ACLs
3226                          * on a directory tree. Based on work by Jim @ IBM.
3227                          */
3228
3229                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3230
3231                         if (lp_profile_acls(SNUM(conn))) {
3232                                 for (i = 0; i < num_aces; i++) {
3233                                         if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3234                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3235                                                                    &orig_owner_sid,
3236                                                                    nt_ace_list[i].type,
3237                                                                    nt_ace_list[i].access_mask,
3238                                                                    nt_ace_list[i].flags);
3239                                                 break;
3240                                         }
3241                                 }
3242                         }
3243                 }
3244
3245                 if (num_aces) {
3246                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3247                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3248                                 goto done;
3249                         }
3250                 }
3251         } /* security_info & DACL_SECURITY_INFORMATION */
3252
3253         psd = make_standard_sec_desc( talloc_tos(),
3254                         (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3255                         (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3256                         psa,
3257                         &sd_size);
3258
3259         if(!psd) {
3260                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3261                 sd_size = 0;
3262                 goto done;
3263         }
3264
3265         /*
3266          * Windows 2000: The DACL_PROTECTED flag in the security
3267          * descriptor marks the ACL as non-inheriting, i.e., no
3268          * ACEs from higher level directories propagate to this
3269          * ACL. In the POSIX ACL model permissions are only
3270          * inherited at file create time, so ACLs never contain
3271          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3272          * flag doesn't seem to bother Windows NT.
3273          * Always set this if map acl inherit is turned off.
3274          */
3275         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3276                 psd->type |= SEC_DESC_DACL_PROTECTED;
3277         } else {
3278                 psd->type |= pal->sd_type;
3279         }
3280
3281         if (psd->dacl) {
3282                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3283         }
3284
3285         *ppdesc = psd;
3286
3287  done:
3288
3289         if (posix_acl) {
3290                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3291         }
3292         if (def_acl) {
3293                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3294         }
3295         free_canon_ace_list(file_ace);
3296         free_canon_ace_list(dir_ace);
3297         free_inherited_info(pal);
3298         SAFE_FREE(nt_ace_list);
3299
3300         return NT_STATUS_OK;
3301 }
3302
3303 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3304                            SEC_DESC **ppdesc)
3305 {
3306         SMB_STRUCT_STAT sbuf;
3307         SMB_ACL_T posix_acl = NULL;
3308         struct pai_val *pal;
3309
3310         *ppdesc = NULL;
3311
3312         DEBUG(10,("posix_fget_nt_acl: called for file %s\n", fsp->fsp_name ));
3313
3314         /* can it happen that fsp_name == NULL ? */
3315         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3316                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name,
3317                                         security_info, ppdesc);
3318         }
3319
3320         /* Get the stat struct for the owner info. */
3321         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3322                 return map_nt_error_from_unix(errno);
3323         }
3324
3325         /* Get the ACL from the fd. */
3326         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3327
3328         pal = fload_inherited_info(fsp);
3329
3330         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name, &sbuf, pal,
3331                                        posix_acl, NULL, security_info, ppdesc);
3332 }
3333
3334 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3335                           uint32_t security_info, SEC_DESC **ppdesc)
3336 {
3337         SMB_STRUCT_STAT sbuf;
3338         SMB_ACL_T posix_acl = NULL;
3339         SMB_ACL_T def_acl = NULL;
3340         struct pai_val *pal;
3341
3342         *ppdesc = NULL;
3343
3344         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3345
3346         /* Get the stat struct for the owner info. */
3347         if(SMB_VFS_STAT(conn, name, &sbuf) != 0) {
3348                 return map_nt_error_from_unix(errno);
3349         }
3350
3351         /* Get the ACL from the path. */
3352         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3353
3354         /* If it's a directory get the default POSIX ACL. */
3355         if(S_ISDIR(sbuf.st_mode)) {
3356                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3357                 def_acl = free_empty_sys_acl(conn, def_acl);
3358         }
3359
3360         pal = load_inherited_info(conn, name);
3361
3362         return posix_get_nt_acl_common(conn, name, &sbuf, pal, posix_acl,
3363                                        def_acl, security_info, ppdesc);
3364 }
3365
3366 /****************************************************************************
3367  Try to chown a file. We will be able to chown it under the following conditions.
3368
3369   1) If we have root privileges, then it will just work.
3370   2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3371   3) If we have SeRestorePrivilege we can change the user to any other user.
3372   4) If we have write permission to the file and dos_filemodes is set
3373      then allow chown to the currently authenticated user.
3374 ****************************************************************************/
3375
3376 int try_chown(connection_struct *conn, const char *fname, uid_t uid, gid_t gid)
3377 {
3378         int ret;
3379         files_struct *fsp;
3380         SMB_STRUCT_STAT st;
3381
3382         if(!CAN_WRITE(conn)) {
3383                 return -1;
3384         }
3385
3386         /* Case (1). */
3387         /* try the direct way first */
3388         ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
3389         if (ret == 0)
3390                 return 0;
3391
3392         /* Case (2) / (3) */
3393         if (lp_enable_privileges()) {
3394
3395                 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3396                                                               &se_take_ownership);
3397                 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3398                                                        &se_restore);
3399
3400                 /* Case (2) */
3401                 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3402                 /* Case (3) */
3403                      ( has_restore_priv ) ) {
3404
3405                         become_root();
3406                         /* Keep the current file gid the same - take ownership doesn't imply group change. */
3407                         ret = SMB_VFS_CHOWN(conn, fname, uid, (gid_t)-1);
3408                         unbecome_root();
3409                         return ret;
3410                 }
3411         }
3412
3413         /* Case (4). */
3414         if (!lp_dos_filemode(SNUM(conn))) {
3415                 errno = EPERM;
3416                 return -1;
3417         }
3418
3419         /* only allow chown to the current user. This is more secure,
3420            and also copes with the case where the SID in a take ownership ACL is
3421            a local SID on the users workstation
3422         */
3423         if (uid != current_user.ut.uid) {
3424                 errno = EPERM;
3425                 return -1;
3426         }
3427
3428         if (SMB_VFS_STAT(conn,fname,&st)) {
3429                 return -1;
3430         }
3431
3432         if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, fname, &st, &fsp))) {
3433                 return -1;
3434         }
3435
3436         become_root();
3437         /* Keep the current file gid the same. */
3438         ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3439         unbecome_root();
3440
3441         close_file_fchmod(NULL, fsp);
3442
3443         return ret;
3444 }
3445
3446 #if 0
3447 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3448
3449 /****************************************************************************
3450  Take care of parent ACL inheritance.
3451 ****************************************************************************/
3452
3453 NTSTATUS append_parent_acl(files_struct *fsp,
3454                                 const SEC_DESC *pcsd,
3455                                 SEC_DESC **pp_new_sd)
3456 {
3457         SEC_DESC *parent_sd = NULL;
3458         files_struct *parent_fsp = NULL;
3459         TALLOC_CTX *mem_ctx = talloc_tos();
3460         char *parent_name = NULL;
3461         SEC_ACE *new_ace = NULL;
3462         unsigned int num_aces = pcsd->dacl->num_aces;
3463         SMB_STRUCT_STAT sbuf;
3464         NTSTATUS status;
3465         int info;
3466         unsigned int i, j;
3467         SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3468         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3469
3470         ZERO_STRUCT(sbuf);
3471
3472         if (psd == NULL) {
3473                 return NT_STATUS_NO_MEMORY;
3474         }
3475
3476         if (!parent_dirname(mem_ctx, fsp->fsp_name, &parent_name, NULL)) {
3477                 return NT_STATUS_NO_MEMORY;
3478         }
3479
3480         status = SMB_VFS_CREATE_FILE(
3481                 fsp->conn,                              /* conn */
3482                 NULL,                                   /* req */
3483                 0,                                      /* root_dir_fid */
3484                 parent_name,                            /* fname */
3485                 0,                                      /* create_file_flags */
3486                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3487                 FILE_SHARE_NONE,                        /* share_access */
3488                 FILE_OPEN,                              /* create_disposition*/
3489                 FILE_DIRECTORY_FILE,                    /* create_options */
3490                 0,                                      /* file_attributes */
3491                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3492                 0,                                      /* allocation_size */
3493                 NULL,                                   /* sd */
3494                 NULL,                                   /* ea_list */
3495                 &parent_fsp,                            /* result */
3496                 &info,                                  /* pinfo */
3497                 &sbuf);                                 /* psbuf */
3498
3499         if (!NT_STATUS_IS_OK(status)) {
3500                 return status;
3501         }
3502
3503         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, parent_fsp->fsp_name,
3504                                     DACL_SECURITY_INFORMATION, &parent_sd );
3505
3506         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3507
3508         if (!NT_STATUS_IS_OK(status)) {
3509                 return status;
3510         }
3511
3512         /*
3513          * Make room for potentially all the ACLs from
3514          * the parent. We used to add the ugw triple here,
3515          * as we knew we were dealing with POSIX ACLs.
3516          * We no longer need to do so as we can guarentee
3517          * that a default ACL from the parent directory will
3518          * be well formed for POSIX ACLs if it came from a
3519          * POSIX ACL source, and if we're not writing to a
3520          * POSIX ACL sink then we don't care if it's not well
3521          * formed. JRA.
3522          */
3523
3524         num_aces += parent_sd->dacl->num_aces;
3525
3526         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3527                                         num_aces)) == NULL) {
3528                 return NT_STATUS_NO_MEMORY;
3529         }
3530
3531         /* Start by copying in all the given ACE entries. */
3532         for (i = 0; i < psd->dacl->num_aces; i++) {
3533                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3534         }
3535
3536         /*
3537          * Note that we're ignoring "inherit permissions" here
3538          * as that really only applies to newly created files. JRA.
3539          */
3540
3541         /* Finally append any inherited ACEs. */
3542         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3543                 SEC_ACE *se = &parent_sd->dacl->aces[j];
3544
3545                 if (fsp->is_directory) {
3546                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3547                                 /* Doesn't apply to a directory - ignore. */
3548                                 DEBUG(10,("append_parent_acl: directory %s "
3549                                         "ignoring non container "
3550                                         "inherit flags %u on ACE with sid %s "
3551                                         "from parent %s\n",
3552                                         fsp->fsp_name,
3553                                         (unsigned int)se->flags,
3554                                         sid_string_dbg(&se->trustee),
3555                                         parent_name));
3556                                 continue;
3557                         }
3558                 } else {
3559                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3560                                 /* Doesn't apply to a file - ignore. */
3561                                 DEBUG(10,("append_parent_acl: file %s "
3562                                         "ignoring non object "
3563                                         "inherit flags %u on ACE with sid %s "
3564                                         "from parent %s\n",
3565                                         fsp->fsp_name,
3566                                         (unsigned int)se->flags,
3567                                         sid_string_dbg(&se->trustee),
3568                                         parent_name));
3569                                 continue;
3570                         }
3571                 }
3572
3573                 if (is_dacl_protected) {
3574                         /* If the DACL is protected it means we must
3575                          * not overwrite an existing ACE entry with the
3576                          * same SID. This is order N^2. Ouch :-(. JRA. */
3577                         unsigned int k;
3578                         for (k = 0; k < psd->dacl->num_aces; k++) {
3579                                 if (sid_equal(&psd->dacl->aces[k].trustee,
3580                                                 &se->trustee)) {
3581                                         break;
3582                                 }
3583                         }
3584                         if (k < psd->dacl->num_aces) {
3585                                 /* SID matched. Ignore. */
3586                                 DEBUG(10,("append_parent_acl: path %s "
3587                                         "ignoring ACE with protected sid %s "
3588                                         "from parent %s\n",
3589                                         fsp->fsp_name,
3590                                         sid_string_dbg(&se->trustee),
3591                                         parent_name));
3592                                 continue;
3593                         }
3594                 }
3595
3596                 sec_ace_copy(&new_ace[i], se);
3597                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3598                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3599                 }
3600                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3601
3602                 if (fsp->is_directory) {
3603                         /*
3604                          * Strip off any inherit only. It's applied.
3605                          */
3606                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3607                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3608                                 /* No further inheritance. */
3609                                 new_ace[i].flags &=
3610                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3611                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3612                         }
3613                 } else {
3614                         /*
3615                          * Strip off any container or inherit
3616                          * flags, they can't apply to objects.
3617                          */
3618                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3619                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3620                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3621                 }
3622                 i++;
3623
3624                 DEBUG(10,("append_parent_acl: path %s "
3625                         "inheriting ACE with sid %s "
3626                         "from parent %s\n",
3627                         fsp->fsp_name,
3628                         sid_string_dbg(&se->trustee),
3629                         parent_name));
3630         }
3631
3632         psd->dacl->aces = new_ace;
3633         psd->dacl->num_aces = i;
3634         psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3635                          SE_DESC_DACL_AUTO_INHERIT_REQ);
3636
3637         *pp_new_sd = psd;
3638         return status;
3639 }
3640 #endif
3641
3642 /****************************************************************************
3643  Reply to set a security descriptor on an fsp. security_info_sent is the
3644  description of the following NT ACL.
3645  This should be the only external function needed for the UNIX style set ACL.
3646 ****************************************************************************/
3647
3648 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd)
3649 {
3650         connection_struct *conn = fsp->conn;
3651         uid_t user = (uid_t)-1;
3652         gid_t grp = (gid_t)-1;
3653         SMB_STRUCT_STAT sbuf;
3654         DOM_SID file_owner_sid;
3655         DOM_SID file_grp_sid;
3656         canon_ace *file_ace_list = NULL;
3657         canon_ace *dir_ace_list = NULL;
3658         bool acl_perms = False;
3659         mode_t orig_mode = (mode_t)0;
3660         NTSTATUS status;
3661         bool set_acl_as_root = false;
3662         bool acl_set_support = false;
3663         bool ret = false;
3664
3665         DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
3666
3667         if (!CAN_WRITE(conn)) {
3668                 DEBUG(10,("set acl rejected on read-only share\n"));
3669                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3670         }
3671
3672         /*
3673          * Get the current state of the file.
3674          */
3675
3676         if(fsp->is_directory || fsp->fh->fd == -1) {
3677                 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0)
3678                         return map_nt_error_from_unix(errno);
3679         } else {
3680                 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0)
3681                         return map_nt_error_from_unix(errno);
3682         }
3683
3684         /* Save the original element we check against. */
3685         orig_mode = sbuf.st_mode;
3686
3687         /*
3688          * Unpack the user/group/world id's.
3689          */
3690
3691         status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3692         if (!NT_STATUS_IS_OK(status)) {
3693                 return status;
3694         }
3695
3696         /*
3697          * Do we need to chown ? If so this must be done first as the incoming
3698          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3699          * Noticed by Simo.
3700          */
3701
3702         if (((user != (uid_t)-1) && (sbuf.st_uid != user)) || (( grp != (gid_t)-1) && (sbuf.st_gid != grp))) {
3703
3704                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3705                                 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3706
3707                 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3708                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3709                                 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3710                         if (errno == EPERM) {
3711                                 return NT_STATUS_INVALID_OWNER;
3712                         }
3713                         return map_nt_error_from_unix(errno);
3714                 }
3715
3716                 /*
3717                  * Recheck the current state of the file, which may have changed.
3718                  * (suid/sgid bits, for instance)
3719                  */
3720
3721                 if(fsp->is_directory) {
3722                         if(SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
3723                                 return map_nt_error_from_unix(errno);
3724                         }
3725                 } else {
3726
3727                         int sret;
3728
3729                         if(fsp->fh->fd == -1)
3730                                 sret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf);
3731                         else
3732                                 sret = SMB_VFS_FSTAT(fsp, &sbuf);
3733
3734                         if(sret != 0)
3735                                 return map_nt_error_from_unix(errno);
3736                 }
3737
3738                 /* Save the original element we check against. */
3739                 orig_mode = sbuf.st_mode;
3740
3741                 /* If we successfully chowned, we know we must
3742                  * be able to set the acl, so do it as root.
3743                  */
3744                 set_acl_as_root = true;
3745         }
3746
3747         create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3748
3749         acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3750                                         &file_ace_list, &dir_ace_list, security_info_sent, psd);
3751
3752         /* Ignore W2K traverse DACL set. */
3753         if (!file_ace_list && !dir_ace_list) {
3754                 return NT_STATUS_OK;
3755         }
3756
3757         if (!acl_perms) {
3758                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3759                 free_canon_ace_list(file_ace_list);
3760                 free_canon_ace_list(dir_ace_list);
3761                 return NT_STATUS_ACCESS_DENIED;
3762         }
3763
3764         /*
3765          * Only change security if we got a DACL.
3766          */
3767
3768         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3769                 free_canon_ace_list(file_ace_list);
3770                 free_canon_ace_list(dir_ace_list);
3771                 return NT_STATUS_OK;
3772         }
3773
3774         /*
3775          * Try using the POSIX ACL set first. Fall back to chmod if
3776          * we have no ACL support on this filesystem.
3777          */
3778
3779         if (acl_perms && file_ace_list) {
3780                 if (set_acl_as_root) {
3781                         become_root();
3782                 }
3783                 ret = set_canon_ace_list(fsp, file_ace_list, False, sbuf.st_gid, &acl_set_support);
3784                 if (set_acl_as_root) {
3785                         unbecome_root();
3786                 }
3787                 if (acl_set_support && ret == false) {
3788                         DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3789                         free_canon_ace_list(file_ace_list);
3790                         free_canon_ace_list(dir_ace_list);
3791                         return map_nt_error_from_unix(errno);
3792                 }
3793         }
3794
3795         if (acl_perms && acl_set_support && fsp->is_directory) {
3796                 if (dir_ace_list) {
3797                         if (set_acl_as_root) {
3798                                 become_root();
3799                         }
3800                         ret = set_canon_ace_list(fsp, dir_ace_list, True, sbuf.st_gid, &acl_set_support);
3801                         if (set_acl_as_root) {
3802                                 unbecome_root();
3803                         }
3804                         if (ret == false) {
3805                                 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3806                                 free_canon_ace_list(file_ace_list);
3807                                 free_canon_ace_list(dir_ace_list);
3808                                 return map_nt_error_from_unix(errno);
3809                         }
3810                 } else {
3811                         int sret = -1;
3812
3813                         /*
3814                          * No default ACL - delete one if it exists.
3815                          */
3816
3817                         if (set_acl_as_root) {
3818                                 become_root();
3819                         }
3820                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3821                         if (set_acl_as_root) {
3822                                 unbecome_root();
3823                         }
3824                         if (sret == -1) {
3825                                 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3826                                         DEBUG(5,("set_nt_acl: acl group control on and "
3827                                                 "current user in file %s primary group. Override delete_def_acl\n",
3828                                                 fsp->fsp_name ));
3829
3830                                         become_root();
3831                                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3832                                         unbecome_root();
3833                                 }
3834
3835                                 if (sret == -1) {
3836                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3837                                         free_canon_ace_list(file_ace_list);
3838                                         free_canon_ace_list(dir_ace_list);
3839                                         return map_nt_error_from_unix(errno);
3840                                 }
3841                         }
3842                 }
3843         }
3844
3845         if (acl_set_support) {
3846                 if (set_acl_as_root) {
3847                         become_root();
3848                 }
3849                 store_inheritance_attributes(fsp,
3850                                 file_ace_list,
3851                                 dir_ace_list,
3852                                 psd->type);
3853                 if (set_acl_as_root) {
3854                         unbecome_root();
3855                 }
3856         }
3857
3858         /*
3859          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3860          */
3861
3862         if(!acl_set_support && acl_perms) {
3863                 mode_t posix_perms;
3864
3865                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3866                         free_canon_ace_list(file_ace_list);
3867                         free_canon_ace_list(dir_ace_list);
3868                         DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3869                                 fsp->fsp_name ));
3870                         return NT_STATUS_ACCESS_DENIED;
3871                 }
3872
3873                 if (orig_mode != posix_perms) {
3874                         int sret = -1;
3875
3876                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3877                                 fsp->fsp_name, (unsigned int)posix_perms ));
3878
3879                         if (set_acl_as_root) {
3880                                 become_root();
3881                         }
3882                         sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3883                         if (set_acl_as_root) {
3884                                 unbecome_root();
3885                         }
3886                         if(sret == -1) {
3887                                 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3888                                         DEBUG(5,("set_nt_acl: acl group control on and "
3889                                                 "current user in file %s primary group. Override chmod\n",
3890                                                 fsp->fsp_name ));
3891
3892                                         become_root();
3893                                         sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3894                                         unbecome_root();
3895                                 }
3896
3897                                 if (sret == -1) {
3898                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3899                                                 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3900                                         free_canon_ace_list(file_ace_list);
3901                                         free_canon_ace_list(dir_ace_list);
3902                                         return map_nt_error_from_unix(errno);
3903                                 }
3904                         }
3905                 }
3906         }
3907
3908         free_canon_ace_list(file_ace_list);
3909         free_canon_ace_list(dir_ace_list);
3910
3911         return NT_STATUS_OK;
3912 }
3913
3914 /****************************************************************************
3915  Get the actual group bits stored on a file with an ACL. Has no effect if
3916  the file has no ACL. Needed in dosmode code where the stat() will return
3917  the mask bits, not the real group bits, for a file with an ACL.
3918 ****************************************************************************/
3919
3920 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3921 {
3922         int entry_id = SMB_ACL_FIRST_ENTRY;
3923         SMB_ACL_ENTRY_T entry;
3924         SMB_ACL_T posix_acl;
3925         int result = -1;
3926
3927         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3928         if (posix_acl == (SMB_ACL_T)NULL)
3929                 return -1;
3930
3931         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3932                 SMB_ACL_TAG_T tagtype;
3933                 SMB_ACL_PERMSET_T permset;
3934
3935                 entry_id = SMB_ACL_NEXT_ENTRY;
3936
3937                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3938                         break;
3939
3940                 if (tagtype == SMB_ACL_GROUP_OBJ) {
3941                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3942                                 break;
3943                         } else {
3944                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
3945                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3946                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3947                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3948                                 result = 0;
3949                                 break;
3950                         }
3951                 }
3952         }
3953         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3954         return result;
3955 }
3956
3957 /****************************************************************************
3958  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3959  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3960 ****************************************************************************/
3961
3962 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
3963 {
3964         int entry_id = SMB_ACL_FIRST_ENTRY;
3965         SMB_ACL_ENTRY_T entry;
3966         int num_entries = 0;
3967
3968         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3969                 SMB_ACL_TAG_T tagtype;
3970                 SMB_ACL_PERMSET_T permset;
3971                 mode_t perms;
3972
3973                 entry_id = SMB_ACL_NEXT_ENTRY;
3974
3975                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
3976                         return -1;
3977
3978                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
3979                         return -1;
3980
3981                 num_entries++;
3982
3983                 switch(tagtype) {
3984                         case SMB_ACL_USER_OBJ:
3985                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
3986                                 break;
3987                         case SMB_ACL_GROUP_OBJ:
3988                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
3989                                 break;
3990                         case SMB_ACL_MASK:
3991                                 /*
3992                                  * FIXME: The ACL_MASK entry permissions should really be set to
3993                                  * the union of the permissions of all ACL_USER,
3994                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
3995                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
3996                                  */
3997                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
3998                                 break;
3999                         case SMB_ACL_OTHER:
4000                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4001                                 break;
4002                         default:
4003                                 continue;
4004                 }
4005
4006                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4007                         return -1;
4008
4009                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4010                         return -1;
4011         }
4012
4013         /*
4014          * If this is a simple 3 element ACL or no elements then it's a standard
4015          * UNIX permission set. Just use chmod...
4016          */
4017
4018         if ((num_entries == 3) || (num_entries == 0))
4019                 return -1;
4020
4021         return 0;
4022 }
4023
4024 /****************************************************************************
4025  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4026  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4027  resulting ACL on TO.  Note that name is in UNIX character set.
4028 ****************************************************************************/
4029
4030 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4031 {
4032         SMB_ACL_T posix_acl = NULL;
4033         int ret = -1;
4034
4035         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4036                 return -1;
4037
4038         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4039                 goto done;
4040
4041         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4042
4043  done:
4044
4045         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4046         return ret;
4047 }
4048
4049 /****************************************************************************
4050  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4051  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4052  Note that name is in UNIX character set.
4053 ****************************************************************************/
4054
4055 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4056 {
4057         return copy_access_posix_acl(conn, name, name, mode);
4058 }
4059
4060 /****************************************************************************
4061  Check for an existing default POSIX ACL on a directory.
4062 ****************************************************************************/
4063
4064 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4065 {
4066         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4067         bool has_acl = False;
4068         SMB_ACL_ENTRY_T entry;
4069
4070         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4071                 has_acl = True;
4072         }
4073
4074         if (def_acl) {
4075                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4076         }
4077         return has_acl;
4078 }
4079
4080 /****************************************************************************
4081  If the parent directory has no default ACL but it does have an Access ACL,
4082  inherit this Access ACL to file name.
4083 ****************************************************************************/
4084
4085 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4086                        const char *name, mode_t mode)
4087 {
4088         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4089                 return 0;
4090
4091         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4092 }
4093
4094 /****************************************************************************
4095  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4096  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4097 ****************************************************************************/
4098
4099 int fchmod_acl(files_struct *fsp, mode_t mode)
4100 {
4101         connection_struct *conn = fsp->conn;
4102         SMB_ACL_T posix_acl = NULL;
4103         int ret = -1;
4104
4105         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4106                 return -1;
4107
4108         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4109                 goto done;
4110
4111         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4112
4113   done:
4114
4115         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4116         return ret;
4117 }
4118
4119 /****************************************************************************
4120  Map from wire type to permset.
4121 ****************************************************************************/
4122
4123 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4124 {
4125         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4126                 return False;
4127         }
4128
4129         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4130                 return False;
4131         }
4132
4133         if (wire_perm & SMB_POSIX_ACL_READ) {
4134                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4135                         return False;
4136                 }
4137         }
4138         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4139                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4140                         return False;
4141                 }
4142         }
4143         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4144                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4145                         return False;
4146                 }
4147         }
4148         return True;
4149 }
4150
4151 /****************************************************************************
4152  Map from wire type to tagtype.
4153 ****************************************************************************/
4154
4155 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4156 {
4157         switch (wire_tt) {
4158                 case SMB_POSIX_ACL_USER_OBJ:
4159                         *p_tt = SMB_ACL_USER_OBJ;
4160                         break;
4161                 case SMB_POSIX_ACL_USER:
4162                         *p_tt = SMB_ACL_USER;
4163                         break;
4164                 case SMB_POSIX_ACL_GROUP_OBJ:
4165                         *p_tt = SMB_ACL_GROUP_OBJ;
4166                         break;
4167                 case SMB_POSIX_ACL_GROUP:
4168                         *p_tt = SMB_ACL_GROUP;
4169                         break;
4170                 case SMB_POSIX_ACL_MASK:
4171                         *p_tt = SMB_ACL_MASK;
4172                         break;
4173                 case SMB_POSIX_ACL_OTHER:
4174                         *p_tt = SMB_ACL_OTHER;
4175                         break;
4176                 default:
4177                         return False;
4178         }
4179         return True;
4180 }
4181
4182 /****************************************************************************
4183  Create a new POSIX acl from wire permissions.
4184  FIXME ! How does the share mask/mode fit into this.... ?
4185 ****************************************************************************/
4186
4187 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4188 {
4189         unsigned int i;
4190         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4191
4192         if (the_acl == NULL) {
4193                 return NULL;
4194         }
4195
4196         for (i = 0; i < num_acls; i++) {
4197                 SMB_ACL_ENTRY_T the_entry;
4198                 SMB_ACL_PERMSET_T the_permset;
4199                 SMB_ACL_TAG_T tag_type;
4200
4201                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4202                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4203                                 i, strerror(errno) ));
4204                         goto fail;
4205                 }
4206
4207                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4208                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4209                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4210                         goto fail;
4211                 }
4212
4213                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4214                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4215                                 i, strerror(errno) ));
4216                         goto fail;
4217                 }
4218
4219                 /* Get the permset pointer from the new ACL entry. */
4220                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4221                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4222                                 i, strerror(errno) ));
4223                         goto fail;
4224                 }
4225
4226                 /* Map from wire to permissions. */
4227                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4228                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4229                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4230                         goto fail;
4231                 }
4232
4233                 /* Now apply to the new ACL entry. */
4234                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4235                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4236                                 i, strerror(errno) ));
4237                         goto fail;
4238                 }
4239
4240                 if (tag_type == SMB_ACL_USER) {
4241                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4242                         uid_t uid = (uid_t)uidval;
4243                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4244                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4245                                         (unsigned int)uid, i, strerror(errno) ));
4246                                 goto fail;
4247                         }
4248                 }
4249
4250                 if (tag_type == SMB_ACL_GROUP) {
4251                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4252                         gid_t gid = (uid_t)gidval;
4253                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4254                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4255                                         (unsigned int)gid, i, strerror(errno) ));
4256                                 goto fail;
4257                         }
4258                 }
4259         }
4260
4261         return the_acl;
4262
4263  fail:
4264
4265         if (the_acl != NULL) {
4266                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4267         }
4268         return NULL;
4269 }
4270
4271 /****************************************************************************
4272  Calls from UNIX extensions - Default POSIX ACL set.
4273  If num_def_acls == 0 and not a directory just return. If it is a directory
4274  and num_def_acls == 0 then remove the default acl. Else set the default acl
4275  on the directory.
4276 ****************************************************************************/
4277
4278 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
4279                                 uint16 num_def_acls, const char *pdata)
4280 {
4281         SMB_ACL_T def_acl = NULL;
4282
4283         if (!S_ISDIR(psbuf->st_mode)) {
4284                 if (num_def_acls) {
4285                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4286                         errno = EISDIR;
4287                         return False;
4288                 } else {
4289                         return True;
4290                 }
4291         }
4292
4293         if (!num_def_acls) {
4294                 /* Remove the default ACL. */
4295                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4296                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4297                                 fname, strerror(errno) ));
4298                         return False;
4299                 }
4300                 return True;
4301         }
4302
4303         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4304                 return False;
4305         }
4306
4307         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4308                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4309                         fname, strerror(errno) ));
4310                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4311                 return False;
4312         }
4313
4314         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4315         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4316         return True;
4317 }
4318
4319 /****************************************************************************
4320  Remove an ACL from a file. As we don't have acl_delete_entry() available
4321  we must read the current acl and copy all entries except MASK, USER and GROUP
4322  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4323  removed.
4324  FIXME ! How does the share mask/mode fit into this.... ?
4325 ****************************************************************************/
4326
4327 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4328 {
4329         SMB_ACL_T file_acl = NULL;
4330         int entry_id = SMB_ACL_FIRST_ENTRY;
4331         SMB_ACL_ENTRY_T entry;
4332         bool ret = False;
4333         /* Create a new ACL with only 3 entries, u/g/w. */
4334         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4335         SMB_ACL_ENTRY_T user_ent = NULL;
4336         SMB_ACL_ENTRY_T group_ent = NULL;
4337         SMB_ACL_ENTRY_T other_ent = NULL;
4338
4339         if (new_file_acl == NULL) {
4340                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4341                 return False;
4342         }
4343
4344         /* Now create the u/g/w entries. */
4345         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4346                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4347                         fname, strerror(errno) ));
4348                 goto done;
4349         }
4350         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4351                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4352                         fname, strerror(errno) ));
4353                 goto done;
4354         }
4355
4356         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4357                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4358                         fname, strerror(errno) ));
4359                 goto done;
4360         }
4361         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4362                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4363                         fname, strerror(errno) ));
4364                 goto done;
4365         }
4366
4367         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4368                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4369                         fname, strerror(errno) ));
4370                 goto done;
4371         }
4372         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4373                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4374                         fname, strerror(errno) ));
4375                 goto done;
4376         }
4377
4378         /* Get the current file ACL. */
4379         if (fsp && fsp->fh->fd != -1) {
4380                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4381         } else {
4382                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4383         }
4384
4385         if (file_acl == NULL) {
4386                 /* This is only returned if an error occurred. Even for a file with
4387                    no acl a u/g/w acl should be returned. */
4388                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4389                         fname, strerror(errno) ));
4390                 goto done;
4391         }
4392
4393         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4394                 SMB_ACL_TAG_T tagtype;
4395                 SMB_ACL_PERMSET_T permset;
4396
4397                 entry_id = SMB_ACL_NEXT_ENTRY;
4398
4399                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4400                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4401                                 fname, strerror(errno) ));
4402                         goto done;
4403                 }
4404
4405                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4406                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4407                                 fname, strerror(errno) ));
4408                         goto done;
4409                 }
4410
4411                 if (tagtype == SMB_ACL_USER_OBJ) {
4412                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4413                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4414                                         fname, strerror(errno) ));
4415                         }
4416                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4417                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4418                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4419                                         fname, strerror(errno) ));
4420                         }
4421                 } else if (tagtype == SMB_ACL_OTHER) {
4422                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4423                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4424                                         fname, strerror(errno) ));
4425                         }
4426                 }
4427         }
4428
4429         /* Set the new empty file ACL. */
4430         if (fsp && fsp->fh->fd != -1) {
4431                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4432                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4433                                 fname, strerror(errno) ));
4434                         goto done;
4435                 }
4436         } else {
4437                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4438                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4439                                 fname, strerror(errno) ));
4440                         goto done;
4441                 }
4442         }
4443
4444         ret = True;
4445
4446  done:
4447
4448         if (file_acl) {
4449                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4450         }
4451         if (new_file_acl) {
4452                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4453         }
4454         return ret;
4455 }
4456
4457 /****************************************************************************
4458  Calls from UNIX extensions - POSIX ACL set.
4459  If num_def_acls == 0 then read/modify/write acl after removing all entries
4460  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4461 ****************************************************************************/
4462
4463 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4464 {
4465         SMB_ACL_T file_acl = NULL;
4466
4467         if (!num_acls) {
4468                 /* Remove the ACL from the file. */
4469                 return remove_posix_acl(conn, fsp, fname);
4470         }
4471
4472         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4473                 return False;
4474         }
4475
4476         if (fsp && fsp->fh->fd != -1) {
4477                 /* The preferred way - use an open fd. */
4478                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4479                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4480                                 fname, strerror(errno) ));
4481                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4482                         return False;
4483                 }
4484         } else {
4485                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4486                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4487                                 fname, strerror(errno) ));
4488                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4489                         return False;
4490                 }
4491         }
4492
4493         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4494         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4495         return True;
4496 }
4497
4498 /********************************************************************
4499  Pull the NT ACL from a file on disk or the OpenEventlog() access
4500  check.  Caller is responsible for freeing the returned security
4501  descriptor via TALLOC_FREE().  This is designed for dealing with
4502  user space access checks in smbd outside of the VFS.  For example,
4503  checking access rights in OpenEventlog().
4504
4505  Assume we are dealing with files (for now)
4506 ********************************************************************/
4507
4508 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4509 {
4510         SEC_DESC *psd, *ret_sd;
4511         connection_struct *conn;
4512         files_struct finfo;
4513         struct fd_handle fh;
4514
4515         conn = TALLOC_ZERO_P(ctx, connection_struct);
4516         if (conn == NULL) {
4517                 DEBUG(0, ("talloc failed\n"));
4518                 return NULL;
4519         }
4520
4521         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4522                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4523                 TALLOC_FREE(conn);
4524                 return NULL;
4525         }
4526
4527         conn->params->service = -1;
4528
4529         set_conn_connectpath(conn, "/");
4530
4531         if (!smbd_vfs_init(conn)) {
4532                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4533                 conn_free_internal( conn );
4534                 return NULL;
4535         }
4536
4537         ZERO_STRUCT( finfo );
4538         ZERO_STRUCT( fh );
4539
4540         finfo.fnum = -1;
4541         finfo.conn = conn;
4542         finfo.fh = &fh;
4543         finfo.fh->fd = -1;
4544         finfo.fsp_name = CONST_DISCARD(char *,fname);
4545
4546         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4547                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4548                 conn_free_internal( conn );
4549                 return NULL;
4550         }
4551
4552         ret_sd = dup_sec_desc( ctx, psd );
4553
4554         conn_free_internal( conn );
4555
4556         return ret_sd;
4557 }