source3/smbd/posix_acls.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB NT Security Descriptor / Unix permission conversion.
   4    Copyright (C) Jeremy Allison 1994-2009.
   5    Copyright (C) Andreas Gruenbacher 2002.
   6    Copyright (C) Simo Sorce <idra@samba.org> 2009.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23
  24 extern struct current_user current_user;
  25 extern const struct generic_mapping file_generic_mapping;
  26
  27 #undef  DBGC_CLASS
  28 #define DBGC_CLASS DBGC_ACLS
  29
  30 /****************************************************************************
  31  Data structures representing the internal ACE format.
  32 ****************************************************************************/
  33
  34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  36
  37 typedef union posix_id {
  38                 uid_t uid;
  39                 gid_t gid;
  40                 int world;
  41 } posix_id;
  42
  43 typedef struct canon_ace {
  44         struct canon_ace *next, *prev;
  45         SMB_ACL_TAG_T type;
  46         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  47         DOM_SID trustee;
  48         enum ace_owner owner_type;
  49         enum ace_attribute attr;
  50         posix_id unix_ug;
  51         uint8_t ace_flags; /* From windows ACE entry. */
  52 } canon_ace;
  53
  54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  55
  56 /*
  57  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  58  * attribute on disk - version 1.
  59  * All values are little endian.
  60  *
  61  * |  1   |  1   |   2         |         2           |  ....
  62  * +------+------+-------------+---------------------+-------------+--------------------+
  63  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  64  * +------+------+-------------+---------------------+-------------+--------------------+
  65  *
  66  * Entry format is :
  67  *
  68  * |  1   |       4           |
  69  * +------+-------------------+
  70  * | value|  uid/gid or world |
  71  * | type |  value            |
  72  * +------+-------------------+
  73  *
  74  * Version 2 format. Stores extra Windows metadata about an ACL.
  75  *
  76  * |  1   |  2       |   2         |         2           |  ....
  77  * +------+----------+-------------+---------------------+-------------+--------------------+
  78  * | vers | ace      | num_entries | num_default_entries | ..entries.. | default_entries... |
  79  * |   2  |  type    |             |                     |             |                    |
  80  * +------+----------+-------------+---------------------+-------------+--------------------+
  81  *
  82  * Entry format is :
  83  *
  84  * |  1   |  1   |       4           |
  85  * +------+------+-------------------+
  86  * | ace  | value|  uid/gid or world |
  87  * | flag | type |  value            |
  88  * +------+-------------------+------+
  89  *
  90  */
  91
  92 #define PAI_VERSION_OFFSET                      0
  93
  94 #define PAI_V1_FLAG_OFFSET                      1
  95 #define PAI_V1_NUM_ENTRIES_OFFSET               2
  96 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET       4
  97 #define PAI_V1_ENTRIES_BASE                     6
  98 #define PAI_V1_ACL_FLAG_PROTECTED               0x1
  99 #define PAI_V1_ENTRY_LENGTH                     5
 100
 101 #define PAI_V1_VERSION                          1
 102
 103 #define PAI_V2_TYPE_OFFSET                      1
 104 #define PAI_V2_NUM_ENTRIES_OFFSET               3
 105 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET       5
 106 #define PAI_V2_ENTRIES_BASE                     7
 107 #define PAI_V2_ENTRY_LENGTH                     6
 108
 109 #define PAI_V2_VERSION                          2
 110
 111 /*
 112  * In memory format of user.SAMBA_PAI attribute.
 113  */
 114
 115 struct pai_entry {
 116         struct pai_entry *next, *prev;
 117         uint8_t ace_flags;
 118         enum ace_owner owner_type;
 119         posix_id unix_ug;
 120 };
 121
 122 struct pai_val {
 123         uint16_t sd_type;
 124         unsigned int num_entries;
 125         struct pai_entry *entry_list;
 126         unsigned int num_def_entries;
 127         struct pai_entry *def_entry_list;
 128 };
 129
 130 /************************************************************************
 131  Return a uint32 of the pai_entry principal.
 132 ************************************************************************/
 133
 134 static uint32_t get_pai_entry_val(struct pai_entry *paie)
 135 {
 136         switch (paie->owner_type) {
 137                 case UID_ACE:
 138                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 139                         return (uint32_t)paie->unix_ug.uid;
 140                 case GID_ACE:
 141                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 142                         return (uint32_t)paie->unix_ug.gid;
 143                 case WORLD_ACE:
 144                 default:
 145                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 146                         return (uint32_t)-1;
 147         }
 148 }
 149
 150 /************************************************************************
 151  Return a uint32 of the entry principal.
 152 ************************************************************************/
 153
 154 static uint32_t get_entry_val(canon_ace *ace_entry)
 155 {
 156         switch (ace_entry->owner_type) {
 157                 case UID_ACE:
 158                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
 159                         return (uint32_t)ace_entry->unix_ug.uid;
 160                 case GID_ACE:
 161                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
 162                         return (uint32_t)ace_entry->unix_ug.gid;
 163                 case WORLD_ACE:
 164                 default:
 165                         DEBUG(10,("get_entry_val: world ace\n"));
 166                         return (uint32_t)-1;
 167         }
 168 }
 169
 170 /************************************************************************
 171  Create the on-disk format (always v2 now). Caller must free.
 172 ************************************************************************/
 173
 174 static char *create_pai_buf_v2(canon_ace *file_ace_list,
 175                                 canon_ace *dir_ace_list,
 176                                 uint16_t sd_type,
 177                                 size_t *store_size)
 178 {
 179         char *pai_buf = NULL;
 180         canon_ace *ace_list = NULL;
 181         char *entry_offset = NULL;
 182         unsigned int num_entries = 0;
 183         unsigned int num_def_entries = 0;
 184
 185         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 186                 num_entries++;
 187         }
 188
 189         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 190                 num_def_entries++;
 191         }
 192
 193         DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 194
 195         *store_size = PAI_V2_ENTRIES_BASE +
 196                 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
 197
 198         pai_buf = (char *)SMB_MALLOC(*store_size);
 199         if (!pai_buf) {
 200                 return NULL;
 201         }
 202
 203         /* Set up the header. */
 204         memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
 205         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
 206         SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
 207         SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
 208         SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 209
 210         entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
 211
 212         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 213                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 214                 uint32_t entry_val = get_entry_val(ace_list);
 215
 216                 SCVAL(entry_offset,0,ace_list->ace_flags);
 217                 SCVAL(entry_offset,1,type_val);
 218                 SIVAL(entry_offset,2,entry_val);
 219                 entry_offset += PAI_V2_ENTRY_LENGTH;
 220         }
 221
 222         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 223                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 224                 uint32_t entry_val = get_entry_val(ace_list);
 225
 226                 SCVAL(entry_offset,0,ace_list->ace_flags);
 227                 SCVAL(entry_offset,1,type_val);
 228                 SIVAL(entry_offset,2,entry_val);
 229                 entry_offset += PAI_V2_ENTRY_LENGTH;
 230         }
 231
 232         return pai_buf;
 233 }
 234
 235 /************************************************************************
 236  Store the user.SAMBA_PAI attribute on disk.
 237 ************************************************************************/
 238
 239 static void store_inheritance_attributes(files_struct *fsp,
 240                                         canon_ace *file_ace_list,
 241                                         canon_ace *dir_ace_list,
 242                                         uint16_t sd_type)
 243 {
 244         int ret;
 245         size_t store_size;
 246         char *pai_buf;
 247
 248         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 249                 return;
 250         }
 251
 252         pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
 253                                 sd_type, &store_size);
 254
 255         if (fsp->fh->fd != -1) {
 256                 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 257                                 pai_buf, store_size, 0);
 258         } else {
 259                 ret = SMB_VFS_SETXATTR(fsp->conn,fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME,
 260                                 pai_buf, store_size, 0);
 261         }
 262
 263         SAFE_FREE(pai_buf);
 264
 265         DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
 266                 (unsigned int)sd_type,
 267                 fsp->fsp_name));
 268
 269         if (ret == -1 && !no_acl_syscall_error(errno)) {
 270                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 271         }
 272 }
 273
 274 /************************************************************************
 275  Delete the in memory inheritance info.
 276 ************************************************************************/
 277
 278 static void free_inherited_info(struct pai_val *pal)
 279 {
 280         if (pal) {
 281                 struct pai_entry *paie, *paie_next;
 282                 for (paie = pal->entry_list; paie; paie = paie_next) {
 283                         paie_next = paie->next;
 284                         SAFE_FREE(paie);
 285                 }
 286                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 287                         paie_next = paie->next;
 288                         SAFE_FREE(paie);
 289                 }
 290                 SAFE_FREE(pal);
 291         }
 292 }
 293
 294 /************************************************************************
 295  Get any stored ACE flags.
 296 ************************************************************************/
 297
 298 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
 299 {
 300         struct pai_entry *paie;
 301
 302         if (!pal) {
 303                 return 0;
 304         }
 305
 306         /* If the entry exists it is inherited. */
 307         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 308                 if (ace_entry->owner_type == paie->owner_type &&
 309                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 310                         return paie->ace_flags;
 311         }
 312         return 0;
 313 }
 314
 315 /************************************************************************
 316  Ensure an attribute just read is valid - v1.
 317 ************************************************************************/
 318
 319 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
 320 {
 321         uint16 num_entries;
 322         uint16 num_def_entries;
 323
 324         if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
 325                 /* Corrupted - too small. */
 326                 return false;
 327         }
 328
 329         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
 330                 return false;
 331         }
 332
 333         num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
 334         num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 335
 336         /* Check the entry lists match. */
 337         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 338
 339         if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
 340                         PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
 341                 return false;
 342         }
 343
 344         return true;
 345 }
 346
 347 /************************************************************************
 348  Ensure an attribute just read is valid - v2.
 349 ************************************************************************/
 350
 351 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
 352 {
 353         uint16 num_entries;
 354         uint16 num_def_entries;
 355
 356         if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
 357                 /* Corrupted - too small. */
 358                 return false;
 359         }
 360
 361         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
 362                 return false;
 363         }
 364
 365         num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
 366         num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 367
 368         /* Check the entry lists match. */
 369         /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
 370
 371         if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
 372                         PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
 373                 return false;
 374         }
 375
 376         return true;
 377 }
 378
 379 /************************************************************************
 380  Decode the owner.
 381 ************************************************************************/
 382
 383 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
 384 {
 385         paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 386         switch( paie->owner_type) {
 387                 case UID_ACE:
 388                         paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 389                         DEBUG(10,("get_pai_owner_type: uid = %u\n",
 390                                 (unsigned int)paie->unix_ug.uid ));
 391                         break;
 392                 case GID_ACE:
 393                         paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 394                         DEBUG(10,("get_pai_owner_type: gid = %u\n",
 395                                 (unsigned int)paie->unix_ug.gid ));
 396                         break;
 397                 case WORLD_ACE:
 398                         paie->unix_ug.world = -1;
 399                         DEBUG(10,("get_pai_owner_type: world ace\n"));
 400                         break;
 401                 default:
 402                         return false;
 403         }
 404         return true;
 405 }
 406
 407 /************************************************************************
 408  Process v2 entries.
 409 ************************************************************************/
 410
 411 static const char *create_pai_v1_entries(struct pai_val *paiv,
 412                                 const char *entry_offset,
 413                                 bool def_entry)
 414 {
 415         int i;
 416
 417         for (i = 0; i < paiv->num_entries; i++) {
 418                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 419                 if (!paie) {
 420                         return NULL;
 421                 }
 422
 423                 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
 424                 if (!get_pai_owner_type(paie, entry_offset)) {
 425                         return NULL;
 426                 }
 427
 428                 if (!def_entry) {
 429                         DLIST_ADD(paiv->entry_list, paie);
 430                 } else {
 431                         DLIST_ADD(paiv->def_entry_list, paie);
 432                 }
 433                 entry_offset += PAI_V1_ENTRY_LENGTH;
 434         }
 435         return entry_offset;
 436 }
 437
 438 /************************************************************************
 439  Convert to in-memory format from version 1.
 440 ************************************************************************/
 441
 442 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
 443 {
 444         const char *entry_offset;
 445         struct pai_val *paiv = NULL;
 446
 447         if (!check_pai_ok_v1(buf, size)) {
 448                 return NULL;
 449         }
 450
 451         paiv = SMB_MALLOC_P(struct pai_val);
 452         if (!paiv) {
 453                 return NULL;
 454         }
 455
 456         memset(paiv, '\0', sizeof(struct pai_val));
 457
 458         paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
 459                         SE_DESC_DACL_PROTECTED : 0;
 460
 461         paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
 462         paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 463
 464         entry_offset = buf + PAI_V1_ENTRIES_BASE;
 465
 466         DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
 467                         paiv->num_entries, paiv->num_def_entries ));
 468
 469         entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
 470         if (entry_offset == NULL) {
 471                 free_inherited_info(paiv);
 472                 return NULL;
 473         }
 474         entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
 475         if (entry_offset == NULL) {
 476                 free_inherited_info(paiv);
 477                 return NULL;
 478         }
 479
 480         return paiv;
 481 }
 482
 483 /************************************************************************
 484  Process v2 entries.
 485 ************************************************************************/
 486
 487 static const char *create_pai_v2_entries(struct pai_val *paiv,
 488                                 const char *entry_offset,
 489                                 bool def_entry)
 490 {
 491         int i;
 492
 493         for (i = 0; i < paiv->num_entries; i++) {
 494                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 495                 if (!paie) {
 496                         return NULL;
 497                 }
 498
 499                 paie->ace_flags = CVAL(entry_offset,0);
 500
 501                 entry_offset++;
 502
 503                 if (!get_pai_owner_type(paie, entry_offset)) {
 504                         return NULL;
 505                 }
 506                 if (!def_entry) {
 507                         DLIST_ADD(paiv->entry_list, paie);
 508                 } else {
 509                         DLIST_ADD(paiv->def_entry_list, paie);
 510                 }
 511                 entry_offset += PAI_V2_ENTRY_LENGTH;
 512         }
 513         return entry_offset;
 514 }
 515
 516 /************************************************************************
 517  Convert to in-memory format from version 2.
 518 ************************************************************************/
 519
 520 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
 521 {
 522         const char *entry_offset;
 523         struct pai_val *paiv = NULL;
 524
 525         if (!check_pai_ok_v2(buf, size)) {
 526                 return NULL;
 527         }
 528
 529         paiv = SMB_MALLOC_P(struct pai_val);
 530         if (!paiv) {
 531                 return NULL;
 532         }
 533
 534         memset(paiv, '\0', sizeof(struct pai_val));
 535
 536         paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
 537
 538         paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
 539         paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 540
 541         entry_offset = buf + PAI_V2_ENTRIES_BASE;
 542
 543         DEBUG(10,("create_pai_val_v2: num_entries = %u, num_def_entries = %u\n",
 544                         paiv->num_entries, paiv->num_def_entries ));
 545
 546         entry_offset = create_pai_v2_entries(paiv, entry_offset, false);
 547         if (entry_offset == NULL) {
 548                 free_inherited_info(paiv);
 549                 return NULL;
 550         }
 551         entry_offset = create_pai_v2_entries(paiv, entry_offset, true);
 552         if (entry_offset == NULL) {
 553                 free_inherited_info(paiv);
 554                 return NULL;
 555         }
 556
 557         return paiv;
 558 }
 559
 560 /************************************************************************
 561  Convert to in-memory format - from either version 1 or 2.
 562 ************************************************************************/
 563
 564 static struct pai_val *create_pai_val(const char *buf, size_t size)
 565 {
 566         if (size < 1) {
 567                 return NULL;
 568         }
 569         if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
 570                 return create_pai_val_v1(buf, size);
 571         } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
 572                 return create_pai_val_v2(buf, size);
 573         } else {
 574                 return NULL;
 575         }
 576 }
 577
 578 /************************************************************************
 579  Load the user.SAMBA_PAI attribute.
 580 ************************************************************************/
 581
 582 static struct pai_val *fload_inherited_info(files_struct *fsp)
 583 {
 584         char *pai_buf;
 585         size_t pai_buf_size = 1024;
 586         struct pai_val *paiv = NULL;
 587         ssize_t ret;
 588
 589         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 590                 return NULL;
 591         }
 592
 593         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 594                 return NULL;
 595         }
 596
 597         do {
 598                 if (fsp->fh->fd != -1) {
 599                         ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 600                                         pai_buf, pai_buf_size);
 601                 } else {
 602                         ret = SMB_VFS_GETXATTR(fsp->conn,fsp->fsp_name,SAMBA_POSIX_INHERITANCE_EA_NAME,
 603                                         pai_buf, pai_buf_size);
 604                 }
 605
 606                 if (ret == -1) {
 607                         if (errno != ERANGE) {
 608                                 break;
 609                         }
 610                         /* Buffer too small - enlarge it. */
 611                         pai_buf_size *= 2;
 612                         SAFE_FREE(pai_buf);
 613                         if (pai_buf_size > 1024*1024) {
 614                                 return NULL; /* Limit malloc to 1mb. */
 615                         }
 616                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 617                                 return NULL;
 618                 }
 619         } while (ret == -1);
 620
 621         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fsp->fsp_name));
 622
 623         if (ret == -1) {
 624                 /* No attribute or not supported. */
 625 #if defined(ENOATTR)
 626                 if (errno != ENOATTR)
 627                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 628 #else
 629                 if (errno != ENOSYS)
 630                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 631 #endif
 632                 SAFE_FREE(pai_buf);
 633                 return NULL;
 634         }
 635
 636         paiv = create_pai_val(pai_buf, ret);
 637
 638         if (paiv) {
 639                 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
 640                         (unsigned int)paiv->sd_type,
 641                         fsp->fsp_name));
 642         }
 643
 644         SAFE_FREE(pai_buf);
 645         return paiv;
 646 }
 647
 648 /************************************************************************
 649  Load the user.SAMBA_PAI attribute.
 650 ************************************************************************/
 651
 652 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
 653                                            const char *fname)
 654 {
 655         char *pai_buf;
 656         size_t pai_buf_size = 1024;
 657         struct pai_val *paiv = NULL;
 658         ssize_t ret;
 659
 660         if (!lp_map_acl_inherit(SNUM(conn))) {
 661                 return NULL;
 662         }
 663
 664         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 665                 return NULL;
 666         }
 667
 668         do {
 669                 ret = SMB_VFS_GETXATTR(conn, fname,
 670                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 671                                        pai_buf, pai_buf_size);
 672
 673                 if (ret == -1) {
 674                         if (errno != ERANGE) {
 675                                 break;
 676                         }
 677                         /* Buffer too small - enlarge it. */
 678                         pai_buf_size *= 2;
 679                         SAFE_FREE(pai_buf);
 680                         if (pai_buf_size > 1024*1024) {
 681                                 return NULL; /* Limit malloc to 1mb. */
 682                         }
 683                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 684                                 return NULL;
 685                 }
 686         } while (ret == -1);
 687
 688         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
 689
 690         if (ret == -1) {
 691                 /* No attribute or not supported. */
 692 #if defined(ENOATTR)
 693                 if (errno != ENOATTR)
 694                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 695 #else
 696                 if (errno != ENOSYS)
 697                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 698 #endif
 699                 SAFE_FREE(pai_buf);
 700                 return NULL;
 701         }
 702
 703         paiv = create_pai_val(pai_buf, ret);
 704
 705         if (paiv) {
 706                 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
 707                         (unsigned int)paiv->sd_type,
 708                         fname));
 709         }
 710
 711         SAFE_FREE(pai_buf);
 712         return paiv;
 713 }
 714
 715 /****************************************************************************
 716  Functions to manipulate the internal ACE format.
 717 ****************************************************************************/
 718
 719 /****************************************************************************
 720  Count a linked list of canonical ACE entries.
 721 ****************************************************************************/
 722
 723 static size_t count_canon_ace_list( canon_ace *l_head )
 724 {
 725         size_t count = 0;
 726         canon_ace *ace;
 727
 728         for (ace = l_head; ace; ace = ace->next)
 729                 count++;
 730
 731         return count;
 732 }
 733
 734 /****************************************************************************
 735  Free a linked list of canonical ACE entries.
 736 ****************************************************************************/
 737
 738 static void free_canon_ace_list( canon_ace *l_head )
 739 {
 740         canon_ace *list, *next;
 741
 742         for (list = l_head; list; list = next) {
 743                 next = list->next;
 744                 DLIST_REMOVE(l_head, list);
 745                 SAFE_FREE(list);
 746         }
 747 }
 748
 749 /****************************************************************************
 750  Function to duplicate a canon_ace entry.
 751 ****************************************************************************/
 752
 753 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 754 {
 755         canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
 756
 757         if (dst_ace == NULL)
 758                 return NULL;
 759
 760         *dst_ace = *src_ace;
 761         dst_ace->prev = dst_ace->next = NULL;
 762         return dst_ace;
 763 }
 764
 765 /****************************************************************************
 766  Print out a canon ace.
 767 ****************************************************************************/
 768
 769 static void print_canon_ace(canon_ace *pace, int num)
 770 {
 771         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 772         dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
 773         if (pace->owner_type == UID_ACE) {
 774                 const char *u_name = uidtoname(pace->unix_ug.uid);
 775                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
 776         } else if (pace->owner_type == GID_ACE) {
 777                 char *g_name = gidtoname(pace->unix_ug.gid);
 778                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
 779         } else
 780                 dbgtext( "other ");
 781         switch (pace->type) {
 782                 case SMB_ACL_USER:
 783                         dbgtext( "SMB_ACL_USER ");
 784                         break;
 785                 case SMB_ACL_USER_OBJ:
 786                         dbgtext( "SMB_ACL_USER_OBJ ");
 787                         break;
 788                 case SMB_ACL_GROUP:
 789                         dbgtext( "SMB_ACL_GROUP ");
 790                         break;
 791                 case SMB_ACL_GROUP_OBJ:
 792                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 793                         break;
 794                 case SMB_ACL_OTHER:
 795                         dbgtext( "SMB_ACL_OTHER ");
 796                         break;
 797                 default:
 798                         dbgtext( "MASK " );
 799                         break;
 800         }
 801
 802         dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
 803         dbgtext( "perms ");
 804         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 805         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 806         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 807 }
 808
 809 /****************************************************************************
 810  Print out a canon ace list.
 811 ****************************************************************************/
 812
 813 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 814 {
 815         int count = 0;
 816
 817         if( DEBUGLVL( 10 )) {
 818                 dbgtext( "print_canon_ace_list: %s\n", name );
 819                 for (;ace_list; ace_list = ace_list->next, count++)
 820                         print_canon_ace(ace_list, count );
 821         }
 822 }
 823
 824 /****************************************************************************
 825  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 826 ****************************************************************************/
 827
 828 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
 829 {
 830         mode_t ret = 0;
 831
 832         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
 833         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 834         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 835
 836         return ret;
 837 }
 838
 839 /****************************************************************************
 840  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 841 ****************************************************************************/
 842
 843 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 844 {
 845         mode_t ret = 0;
 846
 847         if (mode & r_mask)
 848                 ret |= S_IRUSR;
 849         if (mode & w_mask)
 850                 ret |= S_IWUSR;
 851         if (mode & x_mask)
 852                 ret |= S_IXUSR;
 853
 854         return ret;
 855 }
 856
 857 /****************************************************************************
 858  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 859  an SMB_ACL_PERMSET_T.
 860 ****************************************************************************/
 861
 862 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 863 {
 864         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1)
 865                 return -1;
 866         if (mode & S_IRUSR) {
 867                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
 868                         return -1;
 869         }
 870         if (mode & S_IWUSR) {
 871                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
 872                         return -1;
 873         }
 874         if (mode & S_IXUSR) {
 875                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
 876                         return -1;
 877         }
 878         return 0;
 879 }
 880
 881 /****************************************************************************
 882  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 883 ****************************************************************************/
 884
 885 void create_file_sids(const SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
 886 {
 887         uid_to_sid( powner_sid, psbuf->st_ex_uid );
 888         gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
 889 }
 890
 891 /****************************************************************************
 892  Is the identity in two ACEs equal ? Check both SID and uid/gid.
 893 ****************************************************************************/
 894
 895 static bool identity_in_ace_equal(canon_ace *ace1, canon_ace *ace2)
 896 {
 897         if (sid_equal(&ace1->trustee, &ace2->trustee)) {
 898                 return True;
 899         }
 900         if (ace1->owner_type == ace2->owner_type) {
 901                 if (ace1->owner_type == UID_ACE &&
 902                                 ace1->unix_ug.uid == ace2->unix_ug.uid) {
 903                         return True;
 904                 } else if (ace1->owner_type == GID_ACE &&
 905                                 ace1->unix_ug.gid == ace2->unix_ug.gid) {
 906                         return True;
 907                 }
 908         }
 909         return False;
 910 }
 911
 912 /****************************************************************************
 913  Merge aces with a common sid - if both are allow or deny, OR the permissions together and
 914  delete the second one. If the first is deny, mask the permissions off and delete the allow
 915  if the permissions become zero, delete the deny if the permissions are non zero.
 916 ****************************************************************************/
 917
 918 static void merge_aces( canon_ace **pp_list_head )
 919 {
 920         canon_ace *l_head = *pp_list_head;
 921         canon_ace *curr_ace_outer;
 922         canon_ace *curr_ace_outer_next;
 923
 924         /*
 925          * First, merge allow entries with identical SIDs, and deny entries
 926          * with identical SIDs.
 927          */
 928
 929         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 930                 canon_ace *curr_ace;
 931                 canon_ace *curr_ace_next;
 932
 933                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 934
 935                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 936
 937                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 938
 939                         if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
 940                                 (curr_ace->attr == curr_ace_outer->attr)) {
 941
 942                                 if( DEBUGLVL( 10 )) {
 943                                         dbgtext("merge_aces: Merging ACE's\n");
 944                                         print_canon_ace( curr_ace_outer, 0);
 945                                         print_canon_ace( curr_ace, 0);
 946                                 }
 947
 948                                 /* Merge two allow or two deny ACE's. */
 949
 950                                 curr_ace_outer->perms |= curr_ace->perms;
 951                                 DLIST_REMOVE(l_head, curr_ace);
 952                                 SAFE_FREE(curr_ace);
 953                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 954                         }
 955                 }
 956         }
 957
 958         /*
 959          * Now go through and mask off allow permissions with deny permissions.
 960          * We can delete either the allow or deny here as we know that each SID
 961          * appears only once in the list.
 962          */
 963
 964         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 965                 canon_ace *curr_ace;
 966                 canon_ace *curr_ace_next;
 967
 968                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 969
 970                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 971
 972                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 973
 974                         /*
 975                          * Subtract ACE's with different entries. Due to the ordering constraints
 976                          * we've put on the ACL, we know the deny must be the first one.
 977                          */
 978
 979                         if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
 980                                 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
 981
 982                                 if( DEBUGLVL( 10 )) {
 983                                         dbgtext("merge_aces: Masking ACE's\n");
 984                                         print_canon_ace( curr_ace_outer, 0);
 985                                         print_canon_ace( curr_ace, 0);
 986                                 }
 987
 988                                 curr_ace->perms &= ~curr_ace_outer->perms;
 989
 990                                 if (curr_ace->perms == 0) {
 991
 992                                         /*
 993                                          * The deny overrides the allow. Remove the allow.
 994                                          */
 995
 996                                         DLIST_REMOVE(l_head, curr_ace);
 997                                         SAFE_FREE(curr_ace);
 998                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 999
1000                                 } else {
1001
1002                                         /*
1003                                          * Even after removing permissions, there
1004                                          * are still allow permissions - delete the deny.
1005                                          * It is safe to delete the deny here,
1006                                          * as we are guarenteed by the deny first
1007                                          * ordering that all the deny entries for
1008                                          * this SID have already been merged into one
1009                                          * before we can get to an allow ace.
1010                                          */
1011
1012                                         DLIST_REMOVE(l_head, curr_ace_outer);
1013                                         SAFE_FREE(curr_ace_outer);
1014                                         break;
1015                                 }
1016                         }
1017
1018                 } /* end for curr_ace */
1019         } /* end for curr_ace_outer */
1020
1021         /* We may have modified the list. */
1022
1023         *pp_list_head = l_head;
1024 }
1025
1026 /****************************************************************************
1027  Check if we need to return NT4.x compatible ACL entries.
1028 ****************************************************************************/
1029
1030 bool nt4_compatible_acls(void)
1031 {
1032         int compat = lp_acl_compatibility();
1033
1034         if (compat == ACL_COMPAT_AUTO) {
1035                 enum remote_arch_types ra_type = get_remote_arch();
1036
1037                 /* Automatically adapt to client */
1038                 return (ra_type <= RA_WINNT);
1039         } else
1040                 return (compat == ACL_COMPAT_WINNT);
1041 }
1042
1043
1044 /****************************************************************************
1045  Map canon_ace perms to permission bits NT.
1046  The attr element is not used here - we only process deny entries on set,
1047  not get. Deny entries are implicit on get with ace->perms = 0.
1048 ****************************************************************************/
1049
1050 static uint32_t map_canon_ace_perms(int snum,
1051                                 enum security_ace_type *pacl_type,
1052                                 mode_t perms,
1053                                 bool directory_ace)
1054 {
1055         uint32_t nt_mask = 0;
1056
1057         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1058
1059         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1060                 if (directory_ace) {
1061                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1062                 } else {
1063                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1064                 }
1065         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1066                 /*
1067                  * Windows NT refuses to display ACEs with no permissions in them (but
1068                  * they are perfectly legal with Windows 2000). If the ACE has empty
1069                  * permissions we cannot use 0, so we use the otherwise unused
1070                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1071                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1072                  * to be changed in the future.
1073                  */
1074
1075                 if (nt4_compatible_acls())
1076                         nt_mask = UNIX_ACCESS_NONE;
1077                 else
1078                         nt_mask = 0;
1079         } else {
1080                 if (directory_ace) {
1081                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1082                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1083                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1084                 } else {
1085                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1086                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1087                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1088                 }
1089         }
1090
1091         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1092                         (unsigned int)perms, (unsigned int)nt_mask ));
1093
1094         return nt_mask;
1095 }
1096
1097 /****************************************************************************
1098  Map NT perms to a UNIX mode_t.
1099 ****************************************************************************/
1100
1101 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
1102 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
1103 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1104
1105 static mode_t map_nt_perms( uint32 *mask, int type)
1106 {
1107         mode_t mode = 0;
1108
1109         switch(type) {
1110         case S_IRUSR:
1111                 if((*mask) & GENERIC_ALL_ACCESS)
1112                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1113                 else {
1114                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1115                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1116                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1117                 }
1118                 break;
1119         case S_IRGRP:
1120                 if((*mask) & GENERIC_ALL_ACCESS)
1121                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1122                 else {
1123                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1124                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1125                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1126                 }
1127                 break;
1128         case S_IROTH:
1129                 if((*mask) & GENERIC_ALL_ACCESS)
1130                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1131                 else {
1132                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1133                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1134                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1135                 }
1136                 break;
1137         }
1138
1139         return mode;
1140 }
1141
1142 /****************************************************************************
1143  Unpack a SEC_DESC into a UNIX owner and group.
1144 ****************************************************************************/
1145
1146 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd)
1147 {
1148         DOM_SID owner_sid;
1149         DOM_SID grp_sid;
1150
1151         *puser = (uid_t)-1;
1152         *pgrp = (gid_t)-1;
1153
1154         if(security_info_sent == 0) {
1155                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1156                 return NT_STATUS_OK;
1157         }
1158
1159         /*
1160          * Validate the owner and group SID's.
1161          */
1162
1163         memset(&owner_sid, '\0', sizeof(owner_sid));
1164         memset(&grp_sid, '\0', sizeof(grp_sid));
1165
1166         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1167
1168         /*
1169          * Don't immediately fail if the owner sid cannot be validated.
1170          * This may be a group chown only set.
1171          */
1172
1173         if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1174                 sid_copy(&owner_sid, psd->owner_sid);
1175                 if (!sid_to_uid(&owner_sid, puser)) {
1176                         if (lp_force_unknown_acl_user(snum)) {
1177                                 /* this allows take ownership to work
1178                                  * reasonably */
1179                                 *puser = current_user.ut.uid;
1180                         } else {
1181                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1182                                          " owner sid for %s\n",
1183                                          sid_string_dbg(&owner_sid)));
1184                                 return NT_STATUS_INVALID_OWNER;
1185                         }
1186                 }
1187                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1188                          (unsigned int)*puser ));
1189         }
1190
1191         /*
1192          * Don't immediately fail if the group sid cannot be validated.
1193          * This may be an owner chown only set.
1194          */
1195
1196         if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1197                 sid_copy(&grp_sid, psd->group_sid);
1198                 if (!sid_to_gid( &grp_sid, pgrp)) {
1199                         if (lp_force_unknown_acl_user(snum)) {
1200                                 /* this allows take group ownership to work
1201                                  * reasonably */
1202                                 *pgrp = current_user.ut.gid;
1203                         } else {
1204                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1205                                          " group sid.\n"));
1206                                 return NT_STATUS_INVALID_OWNER;
1207                         }
1208                 }
1209                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1210                          (unsigned int)*pgrp));
1211         }
1212
1213         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1214
1215         return NT_STATUS_OK;
1216 }
1217
1218 /****************************************************************************
1219  Ensure the enforced permissions for this share apply.
1220 ****************************************************************************/
1221
1222 static void apply_default_perms(const struct share_params *params,
1223                                 const bool is_directory, canon_ace *pace,
1224                                 mode_t type)
1225 {
1226         mode_t and_bits = (mode_t)0;
1227         mode_t or_bits = (mode_t)0;
1228
1229         /* Get the initial bits to apply. */
1230
1231         if (is_directory) {
1232                 and_bits = lp_dir_security_mask(params->service);
1233                 or_bits = lp_force_dir_security_mode(params->service);
1234         } else {
1235                 and_bits = lp_security_mask(params->service);
1236                 or_bits = lp_force_security_mode(params->service);
1237         }
1238
1239         /* Now bounce them into the S_USR space. */
1240         switch(type) {
1241         case S_IRUSR:
1242                 /* Ensure owner has read access. */
1243                 pace->perms |= S_IRUSR;
1244                 if (is_directory)
1245                         pace->perms |= (S_IWUSR|S_IXUSR);
1246                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1247                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1248                 break;
1249         case S_IRGRP:
1250                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1251                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1252                 break;
1253         case S_IROTH:
1254                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1255                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1256                 break;
1257         }
1258
1259         pace->perms = ((pace->perms & and_bits)|or_bits);
1260 }
1261
1262 /****************************************************************************
1263  Check if a given uid/SID is in a group gid/SID. This is probably very
1264  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1265 ****************************************************************************/
1266
1267 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1268 {
1269         const char *u_name = NULL;
1270
1271         /* "Everyone" always matches every uid. */
1272
1273         if (sid_equal(&group_ace->trustee, &global_sid_World))
1274                 return True;
1275
1276         /*
1277          * if it's the current user, we already have the unix token
1278          * and don't need to do the complex user_in_group_sid() call
1279          */
1280         if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1281                 size_t i;
1282
1283                 if (group_ace->unix_ug.gid == current_user.ut.gid) {
1284                         return True;
1285                 }
1286
1287                 for (i=0; i < current_user.ut.ngroups; i++) {
1288                         if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1289                                 return True;
1290                         }
1291                 }
1292         }
1293
1294         /* u_name talloc'ed off tos. */
1295         u_name = uidtoname(uid_ace->unix_ug.uid);
1296         if (!u_name) {
1297                 return False;
1298         }
1299
1300         /*
1301          * user_in_group_sid() uses create_token_from_username()
1302          * which creates an artificial NT token given just a username,
1303          * so this is not reliable for users from foreign domains
1304          * exported by winbindd!
1305          */
1306         return user_in_group_sid(u_name, &group_ace->trustee);
1307 }
1308
1309 /****************************************************************************
1310  A well formed POSIX file or default ACL has at least 3 entries, a
1311  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1312  In addition, the owner must always have at least read access.
1313  When using this call on get_acl, the pst struct is valid and contains
1314  the mode of the file. When using this call on set_acl, the pst struct has
1315  been modified to have a mode containing the default for this file or directory
1316  type.
1317 ****************************************************************************/
1318
1319 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1320                                      const struct share_params *params,
1321                                      const bool is_directory,
1322                                                         const DOM_SID *pfile_owner_sid,
1323                                                         const DOM_SID *pfile_grp_sid,
1324                                                         const SMB_STRUCT_STAT *pst,
1325                                                         bool setting_acl)
1326 {
1327         canon_ace *pace;
1328         bool got_user = False;
1329         bool got_grp = False;
1330         bool got_other = False;
1331         canon_ace *pace_other = NULL;
1332
1333         for (pace = *pp_ace; pace; pace = pace->next) {
1334                 if (pace->type == SMB_ACL_USER_OBJ) {
1335
1336                         if (setting_acl)
1337                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1338                         got_user = True;
1339
1340                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1341
1342                         /*
1343                          * Ensure create mask/force create mode is respected on set.
1344                          */
1345
1346                         if (setting_acl)
1347                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1348                         got_grp = True;
1349
1350                 } else if (pace->type == SMB_ACL_OTHER) {
1351
1352                         /*
1353                          * Ensure create mask/force create mode is respected on set.
1354                          */
1355
1356                         if (setting_acl)
1357                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1358                         got_other = True;
1359                         pace_other = pace;
1360                 }
1361         }
1362
1363         if (!got_user) {
1364                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1365                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1366                         return False;
1367                 }
1368
1369                 ZERO_STRUCTP(pace);
1370                 pace->type = SMB_ACL_USER_OBJ;
1371                 pace->owner_type = UID_ACE;
1372                 pace->unix_ug.uid = pst->st_ex_uid;
1373                 pace->trustee = *pfile_owner_sid;
1374                 pace->attr = ALLOW_ACE;
1375
1376                 if (setting_acl) {
1377                         /* See if the owning user is in any of the other groups in
1378                            the ACE. If so, OR in the permissions from that group. */
1379
1380                         bool group_matched = False;
1381                         canon_ace *pace_iter;
1382
1383                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1384                                 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1385                                         if (uid_entry_in_group(pace, pace_iter)) {
1386                                                 pace->perms |= pace_iter->perms;
1387                                                 group_matched = True;
1388                                         }
1389                                 }
1390                         }
1391
1392                         /* If we only got an "everyone" perm, just use that. */
1393                         if (!group_matched) {
1394                                 if (got_other)
1395                                         pace->perms = pace_other->perms;
1396                                 else
1397                                         pace->perms = 0;
1398                         }
1399
1400                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1401                 } else {
1402                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1403                 }
1404
1405                 DLIST_ADD(*pp_ace, pace);
1406         }
1407
1408         if (!got_grp) {
1409                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1410                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1411                         return False;
1412                 }
1413
1414                 ZERO_STRUCTP(pace);
1415                 pace->type = SMB_ACL_GROUP_OBJ;
1416                 pace->owner_type = GID_ACE;
1417                 pace->unix_ug.uid = pst->st_ex_gid;
1418                 pace->trustee = *pfile_grp_sid;
1419                 pace->attr = ALLOW_ACE;
1420                 if (setting_acl) {
1421                         /* If we only got an "everyone" perm, just use that. */
1422                         if (got_other)
1423                                 pace->perms = pace_other->perms;
1424                         else
1425                                 pace->perms = 0;
1426                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1427                 } else {
1428                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1429                 }
1430
1431                 DLIST_ADD(*pp_ace, pace);
1432         }
1433
1434         if (!got_other) {
1435                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1436                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1437                         return False;
1438                 }
1439
1440                 ZERO_STRUCTP(pace);
1441                 pace->type = SMB_ACL_OTHER;
1442                 pace->owner_type = WORLD_ACE;
1443                 pace->unix_ug.world = -1;
1444                 pace->trustee = global_sid_World;
1445                 pace->attr = ALLOW_ACE;
1446                 if (setting_acl) {
1447                         pace->perms = 0;
1448                         apply_default_perms(params, is_directory, pace, S_IROTH);
1449                 } else
1450                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1451
1452                 DLIST_ADD(*pp_ace, pace);
1453         }
1454
1455         return True;
1456 }
1457
1458 /****************************************************************************
1459  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1460  If it does not have them, check if there are any entries where the trustee is the
1461  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1462 ****************************************************************************/
1463
1464 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1465 {
1466         bool got_user_obj, got_group_obj;
1467         canon_ace *current_ace;
1468         int i, entries;
1469
1470         entries = count_canon_ace_list(ace);
1471         got_user_obj = False;
1472         got_group_obj = False;
1473
1474         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1475                 if (current_ace->type == SMB_ACL_USER_OBJ)
1476                         got_user_obj = True;
1477                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1478                         got_group_obj = True;
1479         }
1480         if (got_user_obj && got_group_obj) {
1481                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1482                 return;
1483         }
1484
1485         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1486                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1487                                 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1488                         current_ace->type = SMB_ACL_USER_OBJ;
1489                         got_user_obj = True;
1490                 }
1491                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1492                                 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1493                         current_ace->type = SMB_ACL_GROUP_OBJ;
1494                         got_group_obj = True;
1495                 }
1496         }
1497         if (!got_user_obj)
1498                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1499         if (!got_group_obj)
1500                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1501 }
1502
1503 /****************************************************************************
1504  Unpack a SEC_DESC into two canonical ace lists.
1505 ****************************************************************************/
1506
1507 static bool create_canon_ace_lists(files_struct *fsp,
1508                                         SMB_STRUCT_STAT *pst,
1509                                         DOM_SID *pfile_owner_sid,
1510                                         DOM_SID *pfile_grp_sid,
1511                                         canon_ace **ppfile_ace,
1512                                         canon_ace **ppdir_ace,
1513                                         const SEC_ACL *dacl)
1514 {
1515         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1516         canon_ace *file_ace = NULL;
1517         canon_ace *dir_ace = NULL;
1518         canon_ace *current_ace = NULL;
1519         bool got_dir_allow = False;
1520         bool got_file_allow = False;
1521         int i, j;
1522
1523         *ppfile_ace = NULL;
1524         *ppdir_ace = NULL;
1525
1526         /*
1527          * Convert the incoming ACL into a more regular form.
1528          */
1529
1530         for(i = 0; i < dacl->num_aces; i++) {
1531                 SEC_ACE *psa = &dacl->aces[i];
1532
1533                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1534                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1535                         return False;
1536                 }
1537
1538                 if (nt4_compatible_acls()) {
1539                         /*
1540                          * The security mask may be UNIX_ACCESS_NONE which should map into
1541                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1542                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1543                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1544                          */
1545
1546                         /*
1547                          * Convert GENERIC bits to specific bits.
1548                          */
1549
1550                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1551
1552                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1553
1554                         if(psa->access_mask != UNIX_ACCESS_NONE)
1555                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1556                 }
1557         }
1558
1559         /*
1560          * Deal with the fact that NT 4.x re-writes the canonical format
1561          * that we return for default ACLs. If a directory ACE is identical
1562          * to a inherited directory ACE then NT changes the bits so that the
1563          * first ACE is set to OI|IO and the second ACE for this SID is set
1564          * to CI. We need to repair this. JRA.
1565          */
1566
1567         for(i = 0; i < dacl->num_aces; i++) {
1568                 SEC_ACE *psa1 = &dacl->aces[i];
1569
1570                 for (j = i + 1; j < dacl->num_aces; j++) {
1571                         SEC_ACE *psa2 = &dacl->aces[j];
1572
1573                         if (psa1->access_mask != psa2->access_mask)
1574                                 continue;
1575
1576                         if (!sid_equal(&psa1->trustee, &psa2->trustee))
1577                                 continue;
1578
1579                         /*
1580                          * Ok - permission bits and SIDs are equal.
1581                          * Check if flags were re-written.
1582                          */
1583
1584                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1585
1586                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1587                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1588
1589                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1590
1591                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1592                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1593
1594                         }
1595                 }
1596         }
1597
1598         for(i = 0; i < dacl->num_aces; i++) {
1599                 SEC_ACE *psa = &dacl->aces[i];
1600
1601                 /*
1602                  * Create a cannon_ace entry representing this NT DACL ACE.
1603                  */
1604
1605                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1606                         free_canon_ace_list(file_ace);
1607                         free_canon_ace_list(dir_ace);
1608                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1609                         return False;
1610                 }
1611
1612                 ZERO_STRUCTP(current_ace);
1613
1614                 sid_copy(&current_ace->trustee, &psa->trustee);
1615
1616                 /*
1617                  * Try and work out if the SID is a user or group
1618                  * as we need to flag these differently for POSIX.
1619                  * Note what kind of a POSIX ACL this should map to.
1620                  */
1621
1622                 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1623                         current_ace->owner_type = WORLD_ACE;
1624                         current_ace->unix_ug.world = -1;
1625                         current_ace->type = SMB_ACL_OTHER;
1626                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1627                         current_ace->owner_type = UID_ACE;
1628                         current_ace->unix_ug.uid = pst->st_ex_uid;
1629                         current_ace->type = SMB_ACL_USER_OBJ;
1630
1631                         /*
1632                          * The Creator Owner entry only specifies inheritable permissions,
1633                          * never access permissions. WinNT doesn't always set the ACE to
1634                          *INHERIT_ONLY, though.
1635                          */
1636
1637                         if (nt4_compatible_acls())
1638                                 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1639                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1640                         current_ace->owner_type = GID_ACE;
1641                         current_ace->unix_ug.gid = pst->st_ex_gid;
1642                         current_ace->type = SMB_ACL_GROUP_OBJ;
1643
1644                         /*
1645                          * The Creator Group entry only specifies inheritable permissions,
1646                          * never access permissions. WinNT doesn't always set the ACE to
1647                          *INHERIT_ONLY, though.
1648                          */
1649                         if (nt4_compatible_acls())
1650                                 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1651
1652                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1653                         current_ace->owner_type = UID_ACE;
1654                         /* If it's the owning user, this is a user_obj, not
1655                          * a user. */
1656                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1657                                 current_ace->type = SMB_ACL_USER_OBJ;
1658                         } else {
1659                                 current_ace->type = SMB_ACL_USER;
1660                         }
1661                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1662                         current_ace->owner_type = GID_ACE;
1663                         /* If it's the primary group, this is a group_obj, not
1664                          * a group. */
1665                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1666                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1667                         } else {
1668                                 current_ace->type = SMB_ACL_GROUP;
1669                         }
1670                 } else {
1671                         /*
1672                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1673                          */
1674
1675                         if (non_mappable_sid(&psa->trustee)) {
1676                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1677                                            "non-mappable SID %s\n",
1678                                            sid_string_dbg(&psa->trustee)));
1679                                 SAFE_FREE(current_ace);
1680                                 continue;
1681                         }
1682
1683                         free_canon_ace_list(file_ace);
1684                         free_canon_ace_list(dir_ace);
1685                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1686                                   "%s to uid or gid.\n",
1687                                   sid_string_dbg(&current_ace->trustee)));
1688                         SAFE_FREE(current_ace);
1689                         return False;
1690                 }
1691
1692                 /*
1693                  * Map the given NT permissions into a UNIX mode_t containing only
1694                  * S_I(R|W|X)USR bits.
1695                  */
1696
1697                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1698                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1699
1700                 /* Store the ace_flag. */
1701                 current_ace->ace_flags = psa->flags;
1702
1703                 /*
1704                  * Now add the created ace to either the file list, the directory
1705                  * list, or both. We *MUST* preserve the order here (hence we use
1706                  * DLIST_ADD_END) as NT ACLs are order dependent.
1707                  */
1708
1709                 if (fsp->is_directory) {
1710
1711                         /*
1712                          * We can only add to the default POSIX ACE list if the ACE is
1713                          * designed to be inherited by both files and directories.
1714                          */
1715
1716                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1717                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1718
1719                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1720
1721                                 /*
1722                                  * Note if this was an allow ace. We can't process
1723                                  * any further deny ace's after this.
1724                                  */
1725
1726                                 if (current_ace->attr == ALLOW_ACE)
1727                                         got_dir_allow = True;
1728
1729                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1730                                         DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1731 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1732                                         free_canon_ace_list(file_ace);
1733                                         free_canon_ace_list(dir_ace);
1734                                         return False;
1735                                 }
1736
1737                                 if( DEBUGLVL( 10 )) {
1738                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1739                                         print_canon_ace( current_ace, 0);
1740                                 }
1741
1742                                 /*
1743                                  * If this is not an inherit only ACE we need to add a duplicate
1744                                  * to the file acl.
1745                                  */
1746
1747                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1748                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1749
1750                                         if (!dup_ace) {
1751                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1752                                                 free_canon_ace_list(file_ace);
1753                                                 free_canon_ace_list(dir_ace);
1754                                                 return False;
1755                                         }
1756
1757                                         /*
1758                                          * We must not free current_ace here as its
1759                                          * pointer is now owned by the dir_ace list.
1760                                          */
1761                                         current_ace = dup_ace;
1762                                 } else {
1763                                         /*
1764                                          * We must not free current_ace here as its
1765                                          * pointer is now owned by the dir_ace list.
1766                                          */
1767                                         current_ace = NULL;
1768                                 }
1769                         }
1770                 }
1771
1772                 /*
1773                  * Only add to the file ACL if not inherit only.
1774                  */
1775
1776                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1777                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1778
1779                         /*
1780                          * Note if this was an allow ace. We can't process
1781                          * any further deny ace's after this.
1782                          */
1783
1784                         if (current_ace->attr == ALLOW_ACE)
1785                                 got_file_allow = True;
1786
1787                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1788                                 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1789 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1790                                 free_canon_ace_list(file_ace);
1791                                 free_canon_ace_list(dir_ace);
1792                                 return False;
1793                         }
1794
1795                         if( DEBUGLVL( 10 )) {
1796                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1797                                 print_canon_ace( current_ace, 0);
1798                         }
1799                         all_aces_are_inherit_only = False;
1800                         /*
1801                          * We must not free current_ace here as its
1802                          * pointer is now owned by the file_ace list.
1803                          */
1804                         current_ace = NULL;
1805                 }
1806
1807                 /*
1808                  * Free if ACE was not added.
1809                  */
1810
1811                 SAFE_FREE(current_ace);
1812         }
1813
1814         if (fsp->is_directory && all_aces_are_inherit_only) {
1815                 /*
1816                  * Windows 2000 is doing one of these weird 'inherit acl'
1817                  * traverses to conserve NTFS ACL resources. Just pretend
1818                  * there was no DACL sent. JRA.
1819                  */
1820
1821                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1822                 free_canon_ace_list(file_ace);
1823                 free_canon_ace_list(dir_ace);
1824                 file_ace = NULL;
1825                 dir_ace = NULL;
1826         } else {
1827                 /*
1828                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1829                  * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1830                  * entries can be converted to *_OBJ. Usually we will already have these
1831                  * entries in the Default ACL, and the Access ACL will not have them.
1832                  */
1833                 if (file_ace) {
1834                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1835                 }
1836                 if (dir_ace) {
1837                         check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1838                 }
1839         }
1840
1841         *ppfile_ace = file_ace;
1842         *ppdir_ace = dir_ace;
1843
1844         return True;
1845 }
1846
1847 /****************************************************************************
1848  ASCII art time again... JRA :-).
1849
1850  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1851  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1852  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1853  allow or deny have been merged, so the same SID can only appear once in the deny
1854  list or once in the allow list.
1855
1856  We then process as follows :
1857
1858  ---------------------------------------------------------------------------
1859  First pass - look for a Everyone DENY entry.
1860
1861  If it is deny all (rwx) trunate the list at this point.
1862  Else, walk the list from this point and use the deny permissions of this
1863  entry as a mask on all following allow entries. Finally, delete
1864  the Everyone DENY entry (we have applied it to everything possible).
1865
1866  In addition, in this pass we remove any DENY entries that have
1867  no permissions (ie. they are a DENY nothing).
1868  ---------------------------------------------------------------------------
1869  Second pass - only deal with deny user entries.
1870
1871  DENY user1 (perms XXX)
1872
1873  new_perms = 0
1874  for all following allow group entries where user1 is in group
1875         new_perms |= group_perms;
1876
1877  user1 entry perms = new_perms & ~ XXX;
1878
1879  Convert the deny entry to an allow entry with the new perms and
1880  push to the end of the list. Note if the user was in no groups
1881  this maps to a specific allow nothing entry for this user.
1882
1883  The common case from the NT ACL choser (userX deny all) is
1884  optimised so we don't do the group lookup - we just map to
1885  an allow nothing entry.
1886
1887  What we're doing here is inferring the allow permissions the
1888  person setting the ACE on user1 wanted by looking at the allow
1889  permissions on the groups the user is currently in. This will
1890  be a snapshot, depending on group membership but is the best
1891  we can do and has the advantage of failing closed rather than
1892  open.
1893  ---------------------------------------------------------------------------
1894  Third pass - only deal with deny group entries.
1895
1896  DENY group1 (perms XXX)
1897
1898  for all following allow user entries where user is in group1
1899    user entry perms = user entry perms & ~ XXX;
1900
1901  If there is a group Everyone allow entry with permissions YYY,
1902  convert the group1 entry to an allow entry and modify its
1903  permissions to be :
1904
1905  new_perms = YYY & ~ XXX
1906
1907  and push to the end of the list.
1908
1909  If there is no group Everyone allow entry then convert the
1910  group1 entry to a allow nothing entry and push to the end of the list.
1911
1912  Note that the common case from the NT ACL choser (groupX deny all)
1913  cannot be optimised here as we need to modify user entries who are
1914  in the group to change them to a deny all also.
1915
1916  What we're doing here is modifying the allow permissions of
1917  user entries (which are more specific in POSIX ACLs) to mask
1918  out the explicit deny set on the group they are in. This will
1919  be a snapshot depending on current group membership but is the
1920  best we can do and has the advantage of failing closed rather
1921  than open.
1922  ---------------------------------------------------------------------------
1923  Fourth pass - cope with cumulative permissions.
1924
1925  for all allow user entries, if there exists an allow group entry with
1926  more permissive permissions, and the user is in that group, rewrite the
1927  allow user permissions to contain both sets of permissions.
1928
1929  Currently the code for this is #ifdef'ed out as these semantics make
1930  no sense to me. JRA.
1931  ---------------------------------------------------------------------------
1932
1933  Note we *MUST* do the deny user pass first as this will convert deny user
1934  entries into allow user entries which can then be processed by the deny
1935  group pass.
1936
1937  The above algorithm took a *lot* of thinking about - hence this
1938  explaination :-). JRA.
1939 ****************************************************************************/
1940
1941 /****************************************************************************
1942  Process a canon_ace list entries. This is very complex code. We need
1943  to go through and remove the "deny" permissions from any allow entry that matches
1944  the id of this entry. We have already refused any NT ACL that wasn't in correct
1945  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1946  we just remove it (to fail safe). We have already removed any duplicate ace
1947  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1948  allow entries.
1949 ****************************************************************************/
1950
1951 static void process_deny_list( canon_ace **pp_ace_list )
1952 {
1953         canon_ace *ace_list = *pp_ace_list;
1954         canon_ace *curr_ace = NULL;
1955         canon_ace *curr_ace_next = NULL;
1956
1957         /* Pass 1 above - look for an Everyone, deny entry. */
1958
1959         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1960                 canon_ace *allow_ace_p;
1961
1962                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1963
1964                 if (curr_ace->attr != DENY_ACE)
1965                         continue;
1966
1967                 if (curr_ace->perms == (mode_t)0) {
1968
1969                         /* Deny nothing entry - delete. */
1970
1971                         DLIST_REMOVE(ace_list, curr_ace);
1972                         continue;
1973                 }
1974
1975                 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1976                         continue;
1977
1978                 /* JRATEST - assert. */
1979                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1980
1981                 if (curr_ace->perms == ALL_ACE_PERMS) {
1982
1983                         /*
1984                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1985                          * list at this point including this entry.
1986                          */
1987
1988                         canon_ace *prev_entry = curr_ace->prev;
1989
1990                         free_canon_ace_list( curr_ace );
1991                         if (prev_entry)
1992                                 prev_entry->next = NULL;
1993                         else {
1994                                 /* We deleted the entire list. */
1995                                 ace_list = NULL;
1996                         }
1997                         break;
1998                 }
1999
2000                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2001
2002                         /*
2003                          * Only mask off allow entries.
2004                          */
2005
2006                         if (allow_ace_p->attr != ALLOW_ACE)
2007                                 continue;
2008
2009                         allow_ace_p->perms &= ~curr_ace->perms;
2010                 }
2011
2012                 /*
2013                  * Now it's been applied, remove it.
2014                  */
2015
2016                 DLIST_REMOVE(ace_list, curr_ace);
2017         }
2018
2019         /* Pass 2 above - deal with deny user entries. */
2020
2021         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2022                 mode_t new_perms = (mode_t)0;
2023                 canon_ace *allow_ace_p;
2024
2025                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2026
2027                 if (curr_ace->attr != DENY_ACE)
2028                         continue;
2029
2030                 if (curr_ace->owner_type != UID_ACE)
2031                         continue;
2032
2033                 if (curr_ace->perms == ALL_ACE_PERMS) {
2034
2035                         /*
2036                          * Optimisation - this is a deny everything to this user.
2037                          * Convert to an allow nothing and push to the end of the list.
2038                          */
2039
2040                         curr_ace->attr = ALLOW_ACE;
2041                         curr_ace->perms = (mode_t)0;
2042                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2043                         continue;
2044                 }
2045
2046                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2047
2048                         if (allow_ace_p->attr != ALLOW_ACE)
2049                                 continue;
2050
2051                         /* We process GID_ACE and WORLD_ACE entries only. */
2052
2053                         if (allow_ace_p->owner_type == UID_ACE)
2054                                 continue;
2055
2056                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2057                                 new_perms |= allow_ace_p->perms;
2058                 }
2059
2060                 /*
2061                  * Convert to a allow entry, modify the perms and push to the end
2062                  * of the list.
2063                  */
2064
2065                 curr_ace->attr = ALLOW_ACE;
2066                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2067                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2068         }
2069
2070         /* Pass 3 above - deal with deny group entries. */
2071
2072         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2073                 canon_ace *allow_ace_p;
2074                 canon_ace *allow_everyone_p = NULL;
2075
2076                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2077
2078                 if (curr_ace->attr != DENY_ACE)
2079                         continue;
2080
2081                 if (curr_ace->owner_type != GID_ACE)
2082                         continue;
2083
2084                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2085
2086                         if (allow_ace_p->attr != ALLOW_ACE)
2087                                 continue;
2088
2089                         /* Store a pointer to the Everyone allow, if it exists. */
2090                         if (allow_ace_p->owner_type == WORLD_ACE)
2091                                 allow_everyone_p = allow_ace_p;
2092
2093                         /* We process UID_ACE entries only. */
2094
2095                         if (allow_ace_p->owner_type != UID_ACE)
2096                                 continue;
2097
2098                         /* Mask off the deny group perms. */
2099
2100                         if (uid_entry_in_group( allow_ace_p, curr_ace))
2101                                 allow_ace_p->perms &= ~curr_ace->perms;
2102                 }
2103
2104                 /*
2105                  * Convert the deny to an allow with the correct perms and
2106                  * push to the end of the list.
2107                  */
2108
2109                 curr_ace->attr = ALLOW_ACE;
2110                 if (allow_everyone_p)
2111                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2112                 else
2113                         curr_ace->perms = (mode_t)0;
2114                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2115         }
2116
2117         /* Doing this fourth pass allows Windows semantics to be layered
2118          * on top of POSIX semantics. I'm not sure if this is desirable.
2119          * For example, in W2K ACLs there is no way to say, "Group X no
2120          * access, user Y full access" if user Y is a member of group X.
2121          * This seems completely broken semantics to me.... JRA.
2122          */
2123
2124 #if 0
2125         /* Pass 4 above - deal with allow entries. */
2126
2127         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2128                 canon_ace *allow_ace_p;
2129
2130                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2131
2132                 if (curr_ace->attr != ALLOW_ACE)
2133                         continue;
2134
2135                 if (curr_ace->owner_type != UID_ACE)
2136                         continue;
2137
2138                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2139
2140                         if (allow_ace_p->attr != ALLOW_ACE)
2141                                 continue;
2142
2143                         /* We process GID_ACE entries only. */
2144
2145                         if (allow_ace_p->owner_type != GID_ACE)
2146                                 continue;
2147
2148                         /* OR in the group perms. */
2149
2150                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2151                                 curr_ace->perms |= allow_ace_p->perms;
2152                 }
2153         }
2154 #endif
2155
2156         *pp_ace_list = ace_list;
2157 }
2158
2159 /****************************************************************************
2160  Create a default mode that will be used if a security descriptor entry has
2161  no user/group/world entries.
2162 ****************************************************************************/
2163
2164 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2165 {
2166         int snum = SNUM(fsp->conn);
2167         mode_t and_bits = (mode_t)0;
2168         mode_t or_bits = (mode_t)0;
2169         mode_t mode;
2170
2171         if (interitable_mode) {
2172                 struct smb_filename *smb_fname = NULL;
2173                 NTSTATUS status;
2174
2175                 status = create_synthetic_smb_fname_split(talloc_tos(),
2176                                                           fsp->fsp_name, NULL,
2177                                                           &smb_fname);
2178                 if (!NT_STATUS_IS_OK(status)) {
2179                         return 0;
2180                 }
2181                 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE, smb_fname,
2182                                  NULL);
2183         } else {
2184                 mode = S_IRUSR;
2185         }
2186
2187         if (fsp->is_directory)
2188                 mode |= (S_IWUSR|S_IXUSR);
2189
2190         /*
2191          * Now AND with the create mode/directory mode bits then OR with the
2192          * force create mode/force directory mode bits.
2193          */
2194
2195         if (fsp->is_directory) {
2196                 and_bits = lp_dir_security_mask(snum);
2197                 or_bits = lp_force_dir_security_mode(snum);
2198         } else {
2199                 and_bits = lp_security_mask(snum);
2200                 or_bits = lp_force_security_mode(snum);
2201         }
2202
2203         return ((mode & and_bits)|or_bits);
2204 }
2205
2206 /****************************************************************************
2207  Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2208  succeeding.
2209 ****************************************************************************/
2210
2211 static bool unpack_canon_ace(files_struct *fsp,
2212                                 SMB_STRUCT_STAT *pst,
2213                                 DOM_SID *pfile_owner_sid,
2214                                 DOM_SID *pfile_grp_sid,
2215                                 canon_ace **ppfile_ace,
2216                                 canon_ace **ppdir_ace,
2217                                 uint32 security_info_sent,
2218                                 const SEC_DESC *psd)
2219 {
2220         canon_ace *file_ace = NULL;
2221         canon_ace *dir_ace = NULL;
2222
2223         *ppfile_ace = NULL;
2224         *ppdir_ace = NULL;
2225
2226         if(security_info_sent == 0) {
2227                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2228                 return False;
2229         }
2230
2231         /*
2232          * If no DACL then this is a chown only security descriptor.
2233          */
2234
2235         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2236                 return True;
2237
2238         /*
2239          * Now go through the DACL and create the canon_ace lists.
2240          */
2241
2242         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2243                                                                 &file_ace, &dir_ace, psd->dacl))
2244                 return False;
2245
2246         if ((file_ace == NULL) && (dir_ace == NULL)) {
2247                 /* W2K traverse DACL set - ignore. */
2248                 return True;
2249         }
2250
2251         /*
2252          * Go through the canon_ace list and merge entries
2253          * belonging to identical users of identical allow or deny type.
2254          * We can do this as all deny entries come first, followed by
2255          * all allow entries (we have mandated this before accepting this acl).
2256          */
2257
2258         print_canon_ace_list( "file ace - before merge", file_ace);
2259         merge_aces( &file_ace );
2260
2261         print_canon_ace_list( "dir ace - before merge", dir_ace);
2262         merge_aces( &dir_ace );
2263
2264         /*
2265          * NT ACLs are order dependent. Go through the acl lists and
2266          * process DENY entries by masking the allow entries.
2267          */
2268
2269         print_canon_ace_list( "file ace - before deny", file_ace);
2270         process_deny_list( &file_ace);
2271
2272         print_canon_ace_list( "dir ace - before deny", dir_ace);
2273         process_deny_list( &dir_ace);
2274
2275         /*
2276          * A well formed POSIX file or default ACL has at least 3 entries, a
2277          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2278          * and optionally a mask entry. Ensure this is the case.
2279          */
2280
2281         print_canon_ace_list( "file ace - before valid", file_ace);
2282
2283         /*
2284          * A default 3 element mode entry for a file should be r-- --- ---.
2285          * A default 3 element mode entry for a directory should be rwx --- ---.
2286          */
2287
2288         pst->st_ex_mode = create_default_mode(fsp, False);
2289
2290         if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2291                 free_canon_ace_list(file_ace);
2292                 free_canon_ace_list(dir_ace);
2293                 return False;
2294         }
2295
2296         print_canon_ace_list( "dir ace - before valid", dir_ace);
2297
2298         /*
2299          * A default inheritable 3 element mode entry for a directory should be the
2300          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2301          * it's a directory.
2302          */
2303
2304         pst->st_ex_mode = create_default_mode(fsp, True);
2305
2306         if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2307                 free_canon_ace_list(file_ace);
2308                 free_canon_ace_list(dir_ace);
2309                 return False;
2310         }
2311
2312         print_canon_ace_list( "file ace - return", file_ace);
2313         print_canon_ace_list( "dir ace - return", dir_ace);
2314
2315         *ppfile_ace = file_ace;
2316         *ppdir_ace = dir_ace;
2317         return True;
2318
2319 }
2320
2321 /******************************************************************************
2322  When returning permissions, try and fit NT display
2323  semantics if possible. Note the the canon_entries here must have been malloced.
2324  The list format should be - first entry = owner, followed by group and other user
2325  entries, last entry = other.
2326
2327  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2328  are not ordered, and match on the most specific entry rather than walking a list,
2329  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2330
2331  Entry 0: owner : deny all except read and write.
2332  Entry 1: owner : allow read and write.
2333  Entry 2: group : deny all except read.
2334  Entry 3: group : allow read.
2335  Entry 4: Everyone : allow read.
2336
2337  But NT cannot display this in their ACL editor !
2338 ********************************************************************************/
2339
2340 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2341 {
2342         canon_ace *l_head = *pp_list_head;
2343         canon_ace *owner_ace = NULL;
2344         canon_ace *other_ace = NULL;
2345         canon_ace *ace = NULL;
2346
2347         for (ace = l_head; ace; ace = ace->next) {
2348                 if (ace->type == SMB_ACL_USER_OBJ)
2349                         owner_ace = ace;
2350                 else if (ace->type == SMB_ACL_OTHER) {
2351                         /* Last ace - this is "other" */
2352                         other_ace = ace;
2353                 }
2354         }
2355
2356         if (!owner_ace || !other_ace) {
2357                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2358                         filename ));
2359                 return;
2360         }
2361
2362         /*
2363          * The POSIX algorithm applies to owner first, and other last,
2364          * so ensure they are arranged in this order.
2365          */
2366
2367         if (owner_ace) {
2368                 DLIST_PROMOTE(l_head, owner_ace);
2369         }
2370
2371         if (other_ace) {
2372                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2373         }
2374
2375         /* We have probably changed the head of the list. */
2376
2377         *pp_list_head = l_head;
2378 }
2379
2380 /****************************************************************************
2381  Create a linked list of canonical ACE entries.
2382 ****************************************************************************/
2383
2384 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2385                                    const char *fname, SMB_ACL_T posix_acl,
2386                                    const SMB_STRUCT_STAT *psbuf,
2387                                    const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2388 {
2389         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2390         canon_ace *l_head = NULL;
2391         canon_ace *ace = NULL;
2392         canon_ace *next_ace = NULL;
2393         int entry_id = SMB_ACL_FIRST_ENTRY;
2394         SMB_ACL_ENTRY_T entry;
2395         size_t ace_count;
2396
2397         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2398                 SMB_ACL_TAG_T tagtype;
2399                 SMB_ACL_PERMSET_T permset;
2400                 DOM_SID sid;
2401                 posix_id unix_ug;
2402                 enum ace_owner owner_type;
2403
2404                 entry_id = SMB_ACL_NEXT_ENTRY;
2405
2406                 /* Is this a MASK entry ? */
2407                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2408                         continue;
2409
2410                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2411                         continue;
2412
2413                 /* Decide which SID to use based on the ACL type. */
2414                 switch(tagtype) {
2415                         case SMB_ACL_USER_OBJ:
2416                                 /* Get the SID from the owner. */
2417                                 sid_copy(&sid, powner);
2418                                 unix_ug.uid = psbuf->st_ex_uid;
2419                                 owner_type = UID_ACE;
2420                                 break;
2421                         case SMB_ACL_USER:
2422                                 {
2423                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2424                                         if (puid == NULL) {
2425                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2426                                                 continue;
2427                                         }
2428                                         /*
2429                                          * A SMB_ACL_USER entry for the owner is shadowed by the
2430                                          * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2431                                          * that entry, so we ignore it. We also don't create such
2432                                          * entries out of the blue when setting ACLs, so a get/set
2433                                          * cycle will drop them.
2434                                          */
2435                                         if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_ex_uid) {
2436                                                 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2437                                                 continue;
2438                                         }
2439                                         uid_to_sid( &sid, *puid);
2440                                         unix_ug.uid = *puid;
2441                                         owner_type = UID_ACE;
2442                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2443                                         break;
2444                                 }
2445                         case SMB_ACL_GROUP_OBJ:
2446                                 /* Get the SID from the owning group. */
2447                                 sid_copy(&sid, pgroup);
2448                                 unix_ug.gid = psbuf->st_ex_gid;
2449                                 owner_type = GID_ACE;
2450                                 break;
2451                         case SMB_ACL_GROUP:
2452                                 {
2453                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2454                                         if (pgid == NULL) {
2455                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2456                                                 continue;
2457                                         }
2458                                         gid_to_sid( &sid, *pgid);
2459                                         unix_ug.gid = *pgid;
2460                                         owner_type = GID_ACE;
2461                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2462                                         break;
2463                                 }
2464                         case SMB_ACL_MASK:
2465                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2466                                 continue; /* Don't count the mask as an entry. */
2467                         case SMB_ACL_OTHER:
2468                                 /* Use the Everyone SID */
2469                                 sid = global_sid_World;
2470                                 unix_ug.world = -1;
2471                                 owner_type = WORLD_ACE;
2472                                 break;
2473                         default:
2474                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2475                                 continue;
2476                 }
2477
2478                 /*
2479                  * Add this entry to the list.
2480                  */
2481
2482                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2483                         goto fail;
2484
2485                 ZERO_STRUCTP(ace);
2486                 ace->type = tagtype;
2487                 ace->perms = convert_permset_to_mode_t(conn, permset);
2488                 ace->attr = ALLOW_ACE;
2489                 ace->trustee = sid;
2490                 ace->unix_ug = unix_ug;
2491                 ace->owner_type = owner_type;
2492                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2493
2494                 DLIST_ADD(l_head, ace);
2495         }
2496
2497         /*
2498          * This next call will ensure we have at least a user/group/world set.
2499          */
2500
2501         if (!ensure_canon_entry_valid(&l_head, conn->params,
2502                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2503                                       psbuf, False))
2504                 goto fail;
2505
2506         /*
2507          * Now go through the list, masking the permissions with the
2508          * acl_mask. Ensure all DENY Entries are at the start of the list.
2509          */
2510
2511         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2512
2513         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2514                 next_ace = ace->next;
2515
2516                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2517                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2518                         ace->perms &= acl_mask;
2519
2520                 if (ace->perms == 0) {
2521                         DLIST_PROMOTE(l_head, ace);
2522                 }
2523
2524                 if( DEBUGLVL( 10 ) ) {
2525                         print_canon_ace(ace, ace_count);
2526                 }
2527         }
2528
2529         arrange_posix_perms(fname,&l_head );
2530
2531         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2532
2533         return l_head;
2534
2535   fail:
2536
2537         free_canon_ace_list(l_head);
2538         return NULL;
2539 }
2540
2541 /****************************************************************************
2542  Check if the current user group list contains a given group.
2543 ****************************************************************************/
2544
2545 static bool current_user_in_group(gid_t gid)
2546 {
2547         int i;
2548
2549         for (i = 0; i < current_user.ut.ngroups; i++) {
2550                 if (current_user.ut.groups[i] == gid) {
2551                         return True;
2552                 }
2553         }
2554
2555         return False;
2556 }
2557
2558 /****************************************************************************
2559  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2560 ****************************************************************************/
2561
2562 static bool acl_group_override(connection_struct *conn,
2563                                const struct smb_filename *smb_fname)
2564 {
2565         if ((errno != EPERM) && (errno != EACCES)) {
2566                 return false;
2567         }
2568
2569         /* file primary group == user primary or supplementary group */
2570         if (lp_acl_group_control(SNUM(conn)) &&
2571             current_user_in_group(smb_fname->st.st_ex_gid)) {
2572                 return true;
2573         }
2574
2575         /* user has writeable permission */
2576         if (lp_dos_filemode(SNUM(conn)) &&
2577             can_write_to_file(conn, smb_fname)) {
2578                 return true;
2579         }
2580
2581         return false;
2582 }
2583
2584 /****************************************************************************
2585  Attempt to apply an ACL to a file or directory.
2586 ****************************************************************************/
2587
2588 static bool set_canon_ace_list(files_struct *fsp,
2589                                 canon_ace *the_ace,
2590                                 bool default_ace,
2591                                 const SMB_STRUCT_STAT *psbuf,
2592                                 bool *pacl_set_support)
2593 {
2594         connection_struct *conn = fsp->conn;
2595         bool ret = False;
2596         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2597         canon_ace *p_ace;
2598         int i;
2599         SMB_ACL_ENTRY_T mask_entry;
2600         bool got_mask_entry = False;
2601         SMB_ACL_PERMSET_T mask_permset;
2602         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2603         bool needs_mask = False;
2604         mode_t mask_perms = 0;
2605         struct smb_filename *smb_fname = NULL;
2606         NTSTATUS status;
2607
2608         status = create_synthetic_smb_fname_split(talloc_tos(), fsp->fsp_name,
2609                                                   psbuf, &smb_fname);
2610         if (!NT_STATUS_IS_OK(status)) {
2611                 goto fail;
2612         }
2613
2614 #if defined(POSIX_ACL_NEEDS_MASK)
2615         /* HP-UX always wants to have a mask (called "class" there). */
2616         needs_mask = True;
2617 #endif
2618
2619         if (the_acl == NULL) {
2620
2621                 if (!no_acl_syscall_error(errno)) {
2622                         /*
2623                          * Only print this error message if we have some kind of ACL
2624                          * support that's not working. Otherwise we would always get this.
2625                          */
2626                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2627                                 default_ace ? "default" : "file", strerror(errno) ));
2628                 }
2629                 *pacl_set_support = False;
2630                 goto fail;
2631         }
2632
2633         if( DEBUGLVL( 10 )) {
2634                 dbgtext("set_canon_ace_list: setting ACL:\n");
2635                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2636                         print_canon_ace( p_ace, i);
2637                 }
2638         }
2639
2640         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2641                 SMB_ACL_ENTRY_T the_entry;
2642                 SMB_ACL_PERMSET_T the_permset;
2643
2644                 /*
2645                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2646                  * named group entries. But if there is an ACL_MASK entry, it applies
2647                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2648                  * so that it doesn't deny (i.e., mask off) any permissions.
2649                  */
2650
2651                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2652                         needs_mask = True;
2653                         mask_perms |= p_ace->perms;
2654                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2655                         mask_perms |= p_ace->perms;
2656                 }
2657
2658                 /*
2659                  * Get the entry for this ACE.
2660                  */
2661
2662                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2663                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2664                                 i, strerror(errno) ));
2665                         goto fail;
2666                 }
2667
2668                 if (p_ace->type == SMB_ACL_MASK) {
2669                         mask_entry = the_entry;
2670                         got_mask_entry = True;
2671                 }
2672
2673                 /*
2674                  * Ok - we now know the ACL calls should be working, don't
2675                  * allow fallback to chmod.
2676                  */
2677
2678                 *pacl_set_support = True;
2679
2680                 /*
2681                  * Initialise the entry from the canon_ace.
2682                  */
2683
2684                 /*
2685                  * First tell the entry what type of ACE this is.
2686                  */
2687
2688                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2689                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2690                                 i, strerror(errno) ));
2691                         goto fail;
2692                 }
2693
2694                 /*
2695                  * Only set the qualifier (user or group id) if the entry is a user
2696                  * or group id ACE.
2697                  */
2698
2699                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2700                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2701                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2702                                         i, strerror(errno) ));
2703                                 goto fail;
2704                         }
2705                 }
2706
2707                 /*
2708                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2709                  */
2710
2711                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2712                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2713                                 i, strerror(errno) ));
2714                         goto fail;
2715                 }
2716
2717                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2718                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2719                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2720                         goto fail;
2721                 }
2722
2723                 /*
2724                  * ..and apply them to the entry.
2725                  */
2726
2727                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2728                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2729                                 i, strerror(errno) ));
2730                         goto fail;
2731                 }
2732
2733                 if( DEBUGLVL( 10 ))
2734                         print_canon_ace( p_ace, i);
2735
2736         }
2737
2738         if (needs_mask && !got_mask_entry) {
2739                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2740                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2741                         goto fail;
2742                 }
2743
2744                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2745                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2746                         goto fail;
2747                 }
2748
2749                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2750                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2751                         goto fail;
2752                 }
2753
2754                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2755                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2756                         goto fail;
2757                 }
2758
2759                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2760                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2761                         goto fail;
2762                 }
2763         }
2764
2765         /*
2766          * Finally apply it to the file or directory.
2767          */
2768
2769         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2770                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, smb_fname->base_name,
2771                                              the_acl_type, the_acl) == -1) {
2772                         /*
2773                          * Some systems allow all the above calls and only fail with no ACL support
2774                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2775                          */
2776                         if (no_acl_syscall_error(errno)) {
2777                                 *pacl_set_support = False;
2778                         }
2779
2780                         if (acl_group_override(conn, smb_fname)) {
2781                                 int sret;
2782
2783                                 DEBUG(5,("set_canon_ace_list: acl group "
2784                                          "control on and current user in file "
2785                                          "%s primary group.\n",
2786                                          smb_fname_str_dbg(smb_fname)));
2787
2788                                 become_root();
2789                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2790                                     smb_fname->base_name, the_acl_type,
2791                                     the_acl);
2792                                 unbecome_root();
2793                                 if (sret == 0) {
2794                                         ret = True;
2795                                 }
2796                         }
2797
2798                         if (ret == False) {
2799                                 DEBUG(2,("set_canon_ace_list: "
2800                                          "sys_acl_set_file type %s failed for "
2801                                          "file %s (%s).\n",
2802                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2803                                          "directory default" : "file",
2804                                          smb_fname_str_dbg(smb_fname),
2805                                          strerror(errno)));
2806                                 goto fail;
2807                         }
2808                 }
2809         } else {
2810                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2811                         /*
2812                          * Some systems allow all the above calls and only fail with no ACL support
2813                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2814                          */
2815                         if (no_acl_syscall_error(errno)) {
2816                                 *pacl_set_support = False;
2817                         }
2818
2819                         if (acl_group_override(conn, smb_fname)) {
2820                                 int sret;
2821
2822                                 DEBUG(5,("set_canon_ace_list: acl group "
2823                                          "control on and current user in file "
2824                                          "%s primary group.\n",
2825                                          smb_fname_str_dbg(smb_fname)));
2826
2827                                 become_root();
2828                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2829                                 unbecome_root();
2830                                 if (sret == 0) {
2831                                         ret = True;
2832                                 }
2833                         }
2834
2835                         if (ret == False) {
2836                                 DEBUG(2,("set_canon_ace_list: "
2837                                          "sys_acl_set_file failed for file %s "
2838                                          "(%s).\n",
2839                                          smb_fname_str_dbg(smb_fname),
2840                                          strerror(errno) ));
2841                                 goto fail;
2842                         }
2843                 }
2844         }
2845
2846         ret = True;
2847
2848   fail:
2849
2850         if (the_acl != NULL) {
2851                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2852         }
2853         TALLOC_FREE(smb_fname);
2854
2855         return ret;
2856 }
2857
2858 /****************************************************************************
2859  Find a particular canon_ace entry.
2860 ****************************************************************************/
2861
2862 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2863 {
2864         while (list) {
2865                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2866                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2867                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2868                         break;
2869                 list = list->next;
2870         }
2871         return list;
2872 }
2873
2874 /****************************************************************************
2875
2876 ****************************************************************************/
2877
2878 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2879 {
2880         SMB_ACL_ENTRY_T entry;
2881
2882         if (!the_acl)
2883                 return NULL;
2884         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2885                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2886                 return NULL;
2887         }
2888         return the_acl;
2889 }
2890
2891 /****************************************************************************
2892  Convert a canon_ace to a generic 3 element permission - if possible.
2893 ****************************************************************************/
2894
2895 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2896
2897 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2898 {
2899         int snum = SNUM(fsp->conn);
2900         size_t ace_count = count_canon_ace_list(file_ace_list);
2901         canon_ace *ace_p;
2902         canon_ace *owner_ace = NULL;
2903         canon_ace *group_ace = NULL;
2904         canon_ace *other_ace = NULL;
2905         mode_t and_bits;
2906         mode_t or_bits;
2907
2908         if (ace_count != 3) {
2909                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2910 posix perms.\n", fsp->fsp_name ));
2911                 return False;
2912         }
2913
2914         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2915                 if (ace_p->owner_type == UID_ACE)
2916                         owner_ace = ace_p;
2917                 else if (ace_p->owner_type == GID_ACE)
2918                         group_ace = ace_p;
2919                 else if (ace_p->owner_type == WORLD_ACE)
2920                         other_ace = ace_p;
2921         }
2922
2923         if (!owner_ace || !group_ace || !other_ace) {
2924                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2925                                 fsp->fsp_name ));
2926                 return False;
2927         }
2928
2929         *posix_perms = (mode_t)0;
2930
2931         *posix_perms |= owner_ace->perms;
2932         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2933         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2934         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2935         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2936         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2937         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2938
2939         /* The owner must have at least read access. */
2940
2941         *posix_perms |= S_IRUSR;
2942         if (fsp->is_directory)
2943                 *posix_perms |= (S_IWUSR|S_IXUSR);
2944
2945         /* If requested apply the masks. */
2946
2947         /* Get the initial bits to apply. */
2948
2949         if (fsp->is_directory) {
2950                 and_bits = lp_dir_security_mask(snum);
2951                 or_bits = lp_force_dir_security_mode(snum);
2952         } else {
2953                 and_bits = lp_security_mask(snum);
2954                 or_bits = lp_force_security_mode(snum);
2955         }
2956
2957         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2958
2959         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2960                 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2961                 fsp->fsp_name ));
2962
2963         return True;
2964 }
2965
2966 /****************************************************************************
2967   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2968   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2969   with CI|OI set so it is inherited and also applies to the directory.
2970   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2971 ****************************************************************************/
2972
2973 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2974 {
2975         size_t i, j;
2976
2977         for (i = 0; i < num_aces; i++) {
2978                 for (j = i+1; j < num_aces; j++) {
2979                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2980                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2981                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2982                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2983
2984                         /* We know the lower number ACE's are file entries. */
2985                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2986                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2987                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2988                                 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2989                                 (i_inh == j_inh) &&
2990                                 (i_flags_ni == 0) &&
2991                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2992                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
2993                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
2994                                 /*
2995                                  * W2K wants to have access allowed zero access ACE's
2996                                  * at the end of the list. If the mask is zero, merge
2997                                  * the non-inherited ACE onto the inherited ACE.
2998                                  */
2999
3000                                 if (nt_ace_list[i].access_mask == 0) {
3001                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3002                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3003                                         if (num_aces - i - 1 > 0)
3004                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3005                                                                 sizeof(SEC_ACE));
3006
3007                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3008                                                 (unsigned int)i, (unsigned int)j ));
3009                                 } else {
3010                                         /*
3011                                          * These are identical except for the flags.
3012                                          * Merge the inherited ACE onto the non-inherited ACE.
3013                                          */
3014
3015                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3016                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3017                                         if (num_aces - j - 1 > 0)
3018                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3019                                                                 sizeof(SEC_ACE));
3020
3021                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3022                                                 (unsigned int)j, (unsigned int)i ));
3023                                 }
3024                                 num_aces--;
3025                                 break;
3026                         }
3027                 }
3028         }
3029
3030         return num_aces;
3031 }
3032
3033 /*
3034  * Add or Replace ACE entry.
3035  * In some cases we need to add a specific ACE for compatibility reasons.
3036  * When doing that we must make sure we are not actually creating a duplicate
3037  * entry. So we need to search whether an ACE entry already exist and eventually
3038  * replacce the access mask, or add a completely new entry if none was found.
3039  *
3040  * This function assumes the array has enough space to add a new entry without
3041  * any reallocation of memory.
3042  */
3043
3044 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3045                                 const DOM_SID *sid, enum security_ace_type type,
3046                                 uint32_t mask, uint8_t flags)
3047 {
3048         int i;
3049
3050         /* first search for a duplicate */
3051         for (i = 0; i < *num_aces; i++) {
3052                 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3053                     (nt_ace_list[i].flags == flags)) break;
3054         }
3055
3056         if (i < *num_aces) { /* found */
3057                 nt_ace_list[i].type = type;
3058                 nt_ace_list[i].access_mask = mask;
3059                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3060                            i, sid_string_dbg(sid), flags));
3061                 return;
3062         }
3063
3064         /* not found, append it */
3065         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3066 }
3067
3068
3069 /****************************************************************************
3070  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3071  the space for the return elements and returns the size needed to return the
3072  security descriptor. This should be the only external function needed for
3073  the UNIX style get ACL.
3074 ****************************************************************************/
3075
3076 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3077                                       const char *name,
3078                                       const SMB_STRUCT_STAT *sbuf,
3079                                       struct pai_val *pal,
3080                                       SMB_ACL_T posix_acl,
3081                                       SMB_ACL_T def_acl,
3082                                       uint32_t security_info,
3083                                       SEC_DESC **ppdesc)
3084 {
3085         DOM_SID owner_sid;
3086         DOM_SID group_sid;
3087         size_t sd_size = 0;
3088         SEC_ACL *psa = NULL;
3089         size_t num_acls = 0;
3090         size_t num_def_acls = 0;
3091         size_t num_aces = 0;
3092         canon_ace *file_ace = NULL;
3093         canon_ace *dir_ace = NULL;
3094         SEC_ACE *nt_ace_list = NULL;
3095         size_t num_profile_acls = 0;
3096         DOM_SID orig_owner_sid;
3097         SEC_DESC *psd = NULL;
3098         int i;
3099
3100         /*
3101          * Get the owner, group and world SIDs.
3102          */
3103
3104         create_file_sids(sbuf, &owner_sid, &group_sid);
3105
3106         if (lp_profile_acls(SNUM(conn))) {
3107                 /* For WXP SP1 the owner must be administrators. */
3108                 sid_copy(&orig_owner_sid, &owner_sid);
3109                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3110                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3111                 num_profile_acls = 3;
3112         }
3113
3114         if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3115
3116                 /*
3117                  * In the optimum case Creator Owner and Creator Group would be used for
3118                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3119                  * would lead to usability problems under Windows: The Creator entries
3120                  * are only available in browse lists of directories and not for files;
3121                  * additionally the identity of the owning group couldn't be determined.
3122                  * We therefore use those identities only for Default ACLs.
3123                  */
3124
3125                 /* Create the canon_ace lists. */
3126                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3127                                             &owner_sid, &group_sid, pal,
3128                                             SMB_ACL_TYPE_ACCESS);
3129
3130                 /* We must have *some* ACLS. */
3131
3132                 if (count_canon_ace_list(file_ace) == 0) {
3133                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3134                         goto done;
3135                 }
3136
3137                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3138                         dir_ace = canonicalise_acl(conn, name, def_acl,
3139                                                    sbuf,
3140                                                    &global_sid_Creator_Owner,
3141                                                    &global_sid_Creator_Group,
3142                                                    pal, SMB_ACL_TYPE_DEFAULT);
3143                 }
3144
3145                 /*
3146                  * Create the NT ACE list from the canonical ace lists.
3147                  */
3148
3149                 {
3150                         canon_ace *ace;
3151                         enum security_ace_type nt_acl_type;
3152
3153                         if (nt4_compatible_acls() && dir_ace) {
3154                                 /*
3155                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3156                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3157                                  * remove entries from the Access ACL if the
3158                                  * corresponding Default ACL entries have also been
3159                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3160                                  * are exceptions. We can do nothing
3161                                  * intelligent if the Default ACL contains entries that
3162                                  * are not also contained in the Access ACL, so this
3163                                  * case will still fail under NT 4.
3164                                  */
3165
3166                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3167                                 if (ace && !ace->perms) {
3168                                         DLIST_REMOVE(dir_ace, ace);
3169                                         SAFE_FREE(ace);
3170
3171                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3172                                         if (ace && !ace->perms) {
3173                                                 DLIST_REMOVE(file_ace, ace);
3174                                                 SAFE_FREE(ace);
3175                                         }
3176                                 }
3177
3178                                 /*
3179                                  * WinNT doesn't usually have Creator Group
3180                                  * in browse lists, so we send this entry to
3181                                  * WinNT even if it contains no relevant
3182                                  * permissions. Once we can add
3183                                  * Creator Group to browse lists we can
3184                                  * re-enable this.
3185                                  */
3186
3187 #if 0
3188                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3189                                 if (ace && !ace->perms) {
3190                                         DLIST_REMOVE(dir_ace, ace);
3191                                         SAFE_FREE(ace);
3192                                 }
3193 #endif
3194
3195                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3196                                 if (ace && !ace->perms) {
3197                                         DLIST_REMOVE(file_ace, ace);
3198                                         SAFE_FREE(ace);
3199                                 }
3200                         }
3201
3202                         num_acls = count_canon_ace_list(file_ace);
3203                         num_def_acls = count_canon_ace_list(dir_ace);
3204
3205                         /* Allocate the ace list. */
3206                         if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3207                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3208                                 goto done;
3209                         }
3210
3211                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3212
3213                         /*
3214                          * Create the NT ACE list from the canonical ace lists.
3215                          */
3216
3217                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3218                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3219                                                 &nt_acl_type,
3220                                                 ace->perms,
3221                                                 S_ISDIR(sbuf->st_ex_mode));
3222                                 init_sec_ace(&nt_ace_list[num_aces++],
3223                                         &ace->trustee,
3224                                         nt_acl_type,
3225                                         acc,
3226                                         ace->ace_flags);
3227                         }
3228
3229                         /* The User must have access to a profile share - even
3230                          * if we can't map the SID. */
3231                         if (lp_profile_acls(SNUM(conn))) {
3232                                 add_or_replace_ace(nt_ace_list, &num_aces,
3233                                                    &global_sid_Builtin_Users,
3234                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3235                                                    FILE_GENERIC_ALL, 0);
3236                         }
3237
3238                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3239                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3240                                                 &nt_acl_type,
3241                                                 ace->perms,
3242                                                 S_ISDIR(sbuf->st_ex_mode));
3243                                 init_sec_ace(&nt_ace_list[num_aces++],
3244                                         &ace->trustee,
3245                                         nt_acl_type,
3246                                         acc,
3247                                         ace->ace_flags |
3248                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3249                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3250                                         SEC_ACE_FLAG_INHERIT_ONLY);
3251                         }
3252
3253                         /* The User must have access to a profile share - even
3254                          * if we can't map the SID. */
3255                         if (lp_profile_acls(SNUM(conn))) {
3256                                 add_or_replace_ace(nt_ace_list, &num_aces,
3257                                                 &global_sid_Builtin_Users,
3258                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3259                                                 FILE_GENERIC_ALL,
3260                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3261                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3262                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3263                         }
3264
3265                         /*
3266                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3267                          * Win2K needs this to get the inheritance correct when replacing ACLs
3268                          * on a directory tree. Based on work by Jim @ IBM.
3269                          */
3270
3271                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3272
3273                         if (lp_profile_acls(SNUM(conn))) {
3274                                 for (i = 0; i < num_aces; i++) {
3275                                         if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3276                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3277                                                                    &orig_owner_sid,
3278                                                                    nt_ace_list[i].type,
3279                                                                    nt_ace_list[i].access_mask,
3280                                                                    nt_ace_list[i].flags);
3281                                                 break;
3282                                         }
3283                                 }
3284                         }
3285                 }
3286
3287                 if (num_aces) {
3288                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3289                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3290                                 goto done;
3291                         }
3292                 }
3293         } /* security_info & DACL_SECURITY_INFORMATION */
3294
3295         psd = make_standard_sec_desc( talloc_tos(),
3296                         (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3297                         (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3298                         psa,
3299                         &sd_size);
3300
3301         if(!psd) {
3302                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3303                 sd_size = 0;
3304                 goto done;
3305         }
3306
3307         /*
3308          * Windows 2000: The DACL_PROTECTED flag in the security
3309          * descriptor marks the ACL as non-inheriting, i.e., no
3310          * ACEs from higher level directories propagate to this
3311          * ACL. In the POSIX ACL model permissions are only
3312          * inherited at file create time, so ACLs never contain
3313          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3314          * flag doesn't seem to bother Windows NT.
3315          * Always set this if map acl inherit is turned off.
3316          */
3317         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3318                 psd->type |= SEC_DESC_DACL_PROTECTED;
3319         } else {
3320                 psd->type |= pal->sd_type;
3321         }
3322
3323         if (psd->dacl) {
3324                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3325         }
3326
3327         *ppdesc = psd;
3328
3329  done:
3330
3331         if (posix_acl) {
3332                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3333         }
3334         if (def_acl) {
3335                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3336         }
3337         free_canon_ace_list(file_ace);
3338         free_canon_ace_list(dir_ace);
3339         free_inherited_info(pal);
3340         SAFE_FREE(nt_ace_list);
3341
3342         return NT_STATUS_OK;
3343 }
3344
3345 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3346                            SEC_DESC **ppdesc)
3347 {
3348         SMB_STRUCT_STAT sbuf;
3349         SMB_ACL_T posix_acl = NULL;
3350         struct pai_val *pal;
3351
3352         *ppdesc = NULL;
3353
3354         DEBUG(10,("posix_fget_nt_acl: called for file %s\n", fsp->fsp_name ));
3355
3356         /* can it happen that fsp_name == NULL ? */
3357         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3358                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name,
3359                                         security_info, ppdesc);
3360         }
3361
3362         /* Get the stat struct for the owner info. */
3363         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3364                 return map_nt_error_from_unix(errno);
3365         }
3366
3367         /* Get the ACL from the fd. */
3368         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3369
3370         pal = fload_inherited_info(fsp);
3371
3372         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name, &sbuf, pal,
3373                                        posix_acl, NULL, security_info, ppdesc);
3374 }
3375
3376 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3377                           uint32_t security_info, SEC_DESC **ppdesc)
3378 {
3379         SMB_STRUCT_STAT sbuf;
3380         SMB_ACL_T posix_acl = NULL;
3381         SMB_ACL_T def_acl = NULL;
3382         struct pai_val *pal;
3383
3384         *ppdesc = NULL;
3385
3386         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3387
3388         /* Get the stat struct for the owner info. */
3389         if(vfs_stat_smb_fname(conn, name, &sbuf) != 0) {
3390                 return map_nt_error_from_unix(errno);
3391         }
3392
3393         /* Get the ACL from the path. */
3394         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3395
3396         /* If it's a directory get the default POSIX ACL. */
3397         if(S_ISDIR(sbuf.st_ex_mode)) {
3398                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3399                 def_acl = free_empty_sys_acl(conn, def_acl);
3400         }
3401
3402         pal = load_inherited_info(conn, name);
3403
3404         return posix_get_nt_acl_common(conn, name, &sbuf, pal, posix_acl,
3405                                        def_acl, security_info, ppdesc);
3406 }
3407
3408 /****************************************************************************
3409  Try to chown a file. We will be able to chown it under the following conditions.
3410
3411   1) If we have root privileges, then it will just work.
3412   2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3413   3) If we have SeRestorePrivilege we can change the user to any other user.
3414   4) If we have write permission to the file and dos_filemodes is set
3415      then allow chown to the currently authenticated user.
3416 ****************************************************************************/
3417
3418 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3419               uid_t uid, gid_t gid)
3420 {
3421         int ret;
3422         files_struct *fsp;
3423
3424         if(!CAN_WRITE(conn)) {
3425                 return -1;
3426         }
3427
3428         /* Case (1). */
3429         /* try the direct way first */
3430         ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3431         if (ret == 0)
3432                 return 0;
3433
3434         /* Case (2) / (3) */
3435         if (lp_enable_privileges()) {
3436
3437                 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3438                                                               &se_take_ownership);
3439                 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3440                                                        &se_restore);
3441
3442                 /* Case (2) */
3443                 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3444                 /* Case (3) */
3445                      ( has_restore_priv ) ) {
3446
3447                         become_root();
3448                         /* Keep the current file gid the same - take ownership doesn't imply group change. */
3449                         ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3450                                             (gid_t)-1);
3451                         unbecome_root();
3452                         return ret;
3453                 }
3454         }
3455
3456         /* Case (4). */
3457         if (!lp_dos_filemode(SNUM(conn))) {
3458                 errno = EPERM;
3459                 return -1;
3460         }
3461
3462         /* only allow chown to the current user. This is more secure,
3463            and also copes with the case where the SID in a take ownership ACL is
3464            a local SID on the users workstation
3465         */
3466         if (uid != current_user.ut.uid) {
3467                 errno = EPERM;
3468                 return -1;
3469         }
3470
3471         if (SMB_VFS_STAT(conn, smb_fname)) {
3472                 return -1;
3473         }
3474
3475         if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, smb_fname, &fsp))) {
3476                 return -1;
3477         }
3478
3479         become_root();
3480         /* Keep the current file gid the same. */
3481         ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3482         unbecome_root();
3483
3484         close_file_fchmod(NULL, fsp);
3485
3486         return ret;
3487 }
3488
3489 #if 0
3490 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3491
3492 /****************************************************************************
3493  Take care of parent ACL inheritance.
3494 ****************************************************************************/
3495
3496 NTSTATUS append_parent_acl(files_struct *fsp,
3497                                 const SEC_DESC *pcsd,
3498                                 SEC_DESC **pp_new_sd)
3499 {
3500         struct smb_filename *smb_dname = NULL;
3501         SEC_DESC *parent_sd = NULL;
3502         files_struct *parent_fsp = NULL;
3503         TALLOC_CTX *mem_ctx = talloc_tos();
3504         char *parent_name = NULL;
3505         SEC_ACE *new_ace = NULL;
3506         unsigned int num_aces = pcsd->dacl->num_aces;
3507         NTSTATUS status;
3508         int info;
3509         unsigned int i, j;
3510         SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3511         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3512
3513         if (psd == NULL) {
3514                 return NT_STATUS_NO_MEMORY;
3515         }
3516
3517         if (!parent_dirname(mem_ctx, fsp->fsp_name, &parent_name, NULL)) {
3518                 return NT_STATUS_NO_MEMORY;
3519         }
3520
3521         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3522                                             &smb_dname);
3523         if (!NT_STATUS_IS_OK(status)) {
3524                 goto fail;
3525         }
3526
3527         status = SMB_VFS_CREATE_FILE(
3528                 fsp->conn,                              /* conn */
3529                 NULL,                                   /* req */
3530                 0,                                      /* root_dir_fid */
3531                 smb_dname,                              /* fname */
3532                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3533                 FILE_SHARE_NONE,                        /* share_access */
3534                 FILE_OPEN,                              /* create_disposition*/
3535                 FILE_DIRECTORY_FILE,                    /* create_options */
3536                 0,                                      /* file_attributes */
3537                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3538                 0,                                      /* allocation_size */
3539                 NULL,                                   /* sd */
3540                 NULL,                                   /* ea_list */
3541                 &parent_fsp,                            /* result */
3542                 &info);                                 /* pinfo */
3543
3544         if (!NT_STATUS_IS_OK(status)) {
3545                 TALLOC_FREE(smb_dname);
3546                 return status;
3547         }
3548
3549         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3550                                     DACL_SECURITY_INFORMATION, &parent_sd );
3551
3552         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3553         TALLOC_FREE(smb_dname);
3554
3555         if (!NT_STATUS_IS_OK(status)) {
3556                 return status;
3557         }
3558
3559         /*
3560          * Make room for potentially all the ACLs from
3561          * the parent. We used to add the ugw triple here,
3562          * as we knew we were dealing with POSIX ACLs.
3563          * We no longer need to do so as we can guarentee
3564          * that a default ACL from the parent directory will
3565          * be well formed for POSIX ACLs if it came from a
3566          * POSIX ACL source, and if we're not writing to a
3567          * POSIX ACL sink then we don't care if it's not well
3568          * formed. JRA.
3569          */
3570
3571         num_aces += parent_sd->dacl->num_aces;
3572
3573         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3574                                         num_aces)) == NULL) {
3575                 return NT_STATUS_NO_MEMORY;
3576         }
3577
3578         /* Start by copying in all the given ACE entries. */
3579         for (i = 0; i < psd->dacl->num_aces; i++) {
3580                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3581         }
3582
3583         /*
3584          * Note that we're ignoring "inherit permissions" here
3585          * as that really only applies to newly created files. JRA.
3586          */
3587
3588         /* Finally append any inherited ACEs. */
3589         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3590                 SEC_ACE *se = &parent_sd->dacl->aces[j];
3591
3592                 if (fsp->is_directory) {
3593                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3594                                 /* Doesn't apply to a directory - ignore. */
3595                                 DEBUG(10,("append_parent_acl: directory %s "
3596                                         "ignoring non container "
3597                                         "inherit flags %u on ACE with sid %s "
3598                                         "from parent %s\n",
3599                                         fsp->fsp_name,
3600                                         (unsigned int)se->flags,
3601                                         sid_string_dbg(&se->trustee),
3602                                         parent_name));
3603                                 continue;
3604                         }
3605                 } else {
3606                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3607                                 /* Doesn't apply to a file - ignore. */
3608                                 DEBUG(10,("append_parent_acl: file %s "
3609                                         "ignoring non object "
3610                                         "inherit flags %u on ACE with sid %s "
3611                                         "from parent %s\n",
3612                                         fsp->fsp_name,
3613                                         (unsigned int)se->flags,
3614                                         sid_string_dbg(&se->trustee),
3615                                         parent_name));
3616                                 continue;
3617                         }
3618                 }
3619
3620                 if (is_dacl_protected) {
3621                         /* If the DACL is protected it means we must
3622                          * not overwrite an existing ACE entry with the
3623                          * same SID. This is order N^2. Ouch :-(. JRA. */
3624                         unsigned int k;
3625                         for (k = 0; k < psd->dacl->num_aces; k++) {
3626                                 if (sid_equal(&psd->dacl->aces[k].trustee,
3627                                                 &se->trustee)) {
3628                                         break;
3629                                 }
3630                         }
3631                         if (k < psd->dacl->num_aces) {
3632                                 /* SID matched. Ignore. */
3633                                 DEBUG(10,("append_parent_acl: path %s "
3634                                         "ignoring ACE with protected sid %s "
3635                                         "from parent %s\n",
3636                                         fsp->fsp_name,
3637                                         sid_string_dbg(&se->trustee),
3638                                         parent_name));
3639                                 continue;
3640                         }
3641                 }
3642
3643                 sec_ace_copy(&new_ace[i], se);
3644                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3645                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3646                 }
3647                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3648
3649                 if (fsp->is_directory) {
3650                         /*
3651                          * Strip off any inherit only. It's applied.
3652                          */
3653                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3654                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3655                                 /* No further inheritance. */
3656                                 new_ace[i].flags &=
3657                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3658                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3659                         }
3660                 } else {
3661                         /*
3662                          * Strip off any container or inherit
3663                          * flags, they can't apply to objects.
3664                          */
3665                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3666                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3667                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3668                 }
3669                 i++;
3670
3671                 DEBUG(10,("append_parent_acl: path %s "
3672                         "inheriting ACE with sid %s "
3673                         "from parent %s\n",
3674                         fsp->fsp_name,
3675                         sid_string_dbg(&se->trustee),
3676                         parent_name));
3677         }
3678
3679         psd->dacl->aces = new_ace;
3680         psd->dacl->num_aces = i;
3681         psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3682                          SE_DESC_DACL_AUTO_INHERIT_REQ);
3683
3684         *pp_new_sd = psd;
3685         return status;
3686 }
3687 #endif
3688
3689 /****************************************************************************
3690  Reply to set a security descriptor on an fsp. security_info_sent is the
3691  description of the following NT ACL.
3692  This should be the only external function needed for the UNIX style set ACL.
3693 ****************************************************************************/
3694
3695 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd)
3696 {
3697         connection_struct *conn = fsp->conn;
3698         uid_t user = (uid_t)-1;
3699         gid_t grp = (gid_t)-1;
3700         DOM_SID file_owner_sid;
3701         DOM_SID file_grp_sid;
3702         canon_ace *file_ace_list = NULL;
3703         canon_ace *dir_ace_list = NULL;
3704         bool acl_perms = False;
3705         mode_t orig_mode = (mode_t)0;
3706         NTSTATUS status;
3707         bool set_acl_as_root = false;
3708         bool acl_set_support = false;
3709         bool ret = false;
3710         struct smb_filename *smb_fname = NULL;
3711
3712         status = create_synthetic_smb_fname_split(talloc_tos(), fsp->fsp_name,
3713                                                   NULL, &smb_fname);
3714         if (!NT_STATUS_IS_OK(status)) {
3715                 goto out;
3716         }
3717
3718         DEBUG(10,("set_nt_acl: called for file %s\n",
3719                   smb_fname_str_dbg(smb_fname)));
3720
3721         if (!CAN_WRITE(conn)) {
3722                 DEBUG(10,("set acl rejected on read-only share\n"));
3723                 status = NT_STATUS_MEDIA_WRITE_PROTECTED;
3724                 goto out;
3725         }
3726
3727         /*
3728          * Get the current state of the file.
3729          */
3730
3731         if(fsp->is_directory || fsp->fh->fd == -1) {
3732                 if(SMB_VFS_STAT(fsp->conn, smb_fname) != 0) {
3733                         status = map_nt_error_from_unix(errno);
3734                         goto out;
3735                 }
3736         } else {
3737                 if(SMB_VFS_FSTAT(fsp, &smb_fname->st) != 0) {
3738                         status = map_nt_error_from_unix(errno);
3739                         goto out;
3740                 }
3741         }
3742
3743         /* Save the original element we check against. */
3744         orig_mode = smb_fname->st.st_ex_mode;
3745
3746         /*
3747          * Unpack the user/group/world id's.
3748          */
3749
3750         status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3751         if (!NT_STATUS_IS_OK(status)) {
3752                 goto out;
3753         }
3754
3755         /*
3756          * Do we need to chown ? If so this must be done first as the incoming
3757          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3758          * Noticed by Simo.
3759          */
3760
3761         if (((user != (uid_t)-1) && (smb_fname->st.st_ex_uid != user)) ||
3762             (( grp != (gid_t)-1) && (smb_fname->st.st_ex_gid != grp))) {
3763
3764                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3765                          smb_fname_str_dbg(smb_fname), (unsigned int)user,
3766                          (unsigned int)grp ));
3767
3768                 if(try_chown(fsp->conn, smb_fname, user, grp) == -1) {
3769                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3770                                  "= %s.\n", smb_fname_str_dbg(smb_fname),
3771                                  (unsigned int)user, (unsigned int)grp,
3772                                  strerror(errno)));
3773                         if (errno == EPERM) {
3774                                 status = NT_STATUS_INVALID_OWNER;
3775                                 goto out;
3776                         }
3777                         status = map_nt_error_from_unix(errno);
3778                         goto out;
3779                 }
3780
3781                 /*
3782                  * Recheck the current state of the file, which may have changed.
3783                  * (suid/sgid bits, for instance)
3784                  */
3785
3786                 if(fsp->is_directory) {
3787                         if(SMB_VFS_STAT(fsp->conn, smb_fname) != 0) {
3788                                 status = map_nt_error_from_unix(errno);
3789                                 goto out;
3790                         }
3791                 } else {
3792
3793                         int sret;
3794
3795                         if(fsp->fh->fd == -1)
3796                                 sret = SMB_VFS_STAT(fsp->conn, smb_fname);
3797                         else
3798                                 sret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
3799
3800                         if(sret != 0)
3801                                 return map_nt_error_from_unix(errno);
3802                 }
3803
3804                 /* Save the original element we check against. */
3805                 orig_mode = smb_fname->st.st_ex_mode;
3806
3807                 /* If we successfully chowned, we know we must
3808                  * be able to set the acl, so do it as root.
3809                  */
3810                 set_acl_as_root = true;
3811         }
3812
3813         create_file_sids(&smb_fname->st, &file_owner_sid, &file_grp_sid);
3814
3815         acl_perms = unpack_canon_ace(fsp, &smb_fname->st, &file_owner_sid,
3816                                      &file_grp_sid, &file_ace_list,
3817                                      &dir_ace_list, security_info_sent, psd);
3818
3819         /* Ignore W2K traverse DACL set. */
3820         if (!file_ace_list && !dir_ace_list) {
3821                 status = NT_STATUS_OK;
3822                 goto out;
3823         }
3824
3825         if (!acl_perms) {
3826                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3827                 free_canon_ace_list(file_ace_list);
3828                 free_canon_ace_list(dir_ace_list);
3829                 status = NT_STATUS_ACCESS_DENIED;
3830                 goto out;
3831         }
3832
3833         /*
3834          * Only change security if we got a DACL.
3835          */
3836
3837         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3838                 free_canon_ace_list(file_ace_list);
3839                 free_canon_ace_list(dir_ace_list);
3840                 status = NT_STATUS_OK;
3841                 goto out;
3842         }
3843
3844         /*
3845          * Try using the POSIX ACL set first. Fall back to chmod if
3846          * we have no ACL support on this filesystem.
3847          */
3848
3849         if (acl_perms && file_ace_list) {
3850                 if (set_acl_as_root) {
3851                         become_root();
3852                 }
3853                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3854                                          &smb_fname->st, &acl_set_support);
3855                 if (set_acl_as_root) {
3856                         unbecome_root();
3857                 }
3858                 if (acl_set_support && ret == false) {
3859                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3860                                  "%s (%s).\n", smb_fname_str_dbg(smb_fname),
3861                                  strerror(errno)));
3862                         free_canon_ace_list(file_ace_list);
3863                         free_canon_ace_list(dir_ace_list);
3864                         status = map_nt_error_from_unix(errno);
3865                         goto out;
3866                 }
3867         }
3868
3869         if (acl_perms && acl_set_support && fsp->is_directory) {
3870                 if (dir_ace_list) {
3871                         if (set_acl_as_root) {
3872                                 become_root();
3873                         }
3874                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
3875                                                  &smb_fname->st,
3876                                                  &acl_set_support);
3877                         if (set_acl_as_root) {
3878                                 unbecome_root();
3879                         }
3880                         if (ret == false) {
3881                                 DEBUG(3,("set_nt_acl: failed to set default "
3882                                          "acl on directory %s (%s).\n",
3883                                          smb_fname_str_dbg(smb_fname),
3884                                          strerror(errno) ));
3885                                 free_canon_ace_list(file_ace_list);
3886                                 free_canon_ace_list(dir_ace_list);
3887                                 status = map_nt_error_from_unix(errno);
3888                                 goto out;
3889                         }
3890                 } else {
3891                         int sret = -1;
3892
3893                         /*
3894                          * No default ACL - delete one if it exists.
3895                          */
3896
3897                         if (set_acl_as_root) {
3898                                 become_root();
3899                         }
3900                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3901                             smb_fname->base_name);
3902                         if (set_acl_as_root) {
3903                                 unbecome_root();
3904                         }
3905                         if (sret == -1) {
3906                                 if (acl_group_override(conn, smb_fname)) {
3907                                         DEBUG(5,("set_nt_acl: acl group "
3908                                                  "control on and current user "
3909                                                  "in file %s primary group. "
3910                                                  "Override delete_def_acl\n",
3911                                                 smb_fname_str_dbg(smb_fname)));
3912
3913                                         become_root();
3914                                         sret =
3915                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3916                                                     conn,
3917                                                     smb_fname->base_name);
3918                                         unbecome_root();
3919                                 }
3920
3921                                 if (sret == -1) {
3922                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3923                                         free_canon_ace_list(file_ace_list);
3924                                         free_canon_ace_list(dir_ace_list);
3925                                         status = map_nt_error_from_unix(errno);
3926                                         goto out;
3927                                 }
3928                         }
3929                 }
3930         }
3931
3932         if (acl_set_support) {
3933                 if (set_acl_as_root) {
3934                         become_root();
3935                 }
3936                 store_inheritance_attributes(fsp,
3937                                 file_ace_list,
3938                                 dir_ace_list,
3939                                 psd->type);
3940                 if (set_acl_as_root) {
3941                         unbecome_root();
3942                 }
3943         }
3944
3945         /*
3946          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3947          */
3948
3949         if(!acl_set_support && acl_perms) {
3950                 mode_t posix_perms;
3951
3952                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3953                         free_canon_ace_list(file_ace_list);
3954                         free_canon_ace_list(dir_ace_list);
3955                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
3956                                  "posix permissions for file %s.\n",
3957                                  smb_fname_str_dbg(smb_fname)));
3958                         status = NT_STATUS_ACCESS_DENIED;
3959                         goto out;
3960                 }
3961
3962                 if (orig_mode != posix_perms) {
3963                         int sret = -1;
3964
3965                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3966                                  smb_fname_str_dbg(smb_fname),
3967                                  (unsigned int)posix_perms));
3968
3969                         if (set_acl_as_root) {
3970                                 become_root();
3971                         }
3972                         sret = SMB_VFS_CHMOD(conn, smb_fname->base_name,
3973                                              posix_perms);
3974                         if (set_acl_as_root) {
3975                                 unbecome_root();
3976                         }
3977                         if(sret == -1) {
3978                                 if (acl_group_override(conn, smb_fname)) {
3979                                         DEBUG(5,("set_nt_acl: acl group "
3980                                                  "control on and current user "
3981                                                  "in file %s primary group. "
3982                                                  "Override chmod\n",
3983                                                 smb_fname_str_dbg(smb_fname)));
3984
3985                                         become_root();
3986                                         sret =
3987                                             SMB_VFS_CHMOD(conn,
3988                                                           smb_fname->base_name,
3989                                                           posix_perms);
3990                                         unbecome_root();
3991                                 }
3992
3993                                 if (sret == -1) {
3994                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
3995                                                  "failed. Error = %s.\n",
3996                                                  smb_fname_str_dbg(smb_fname),
3997                                                  (unsigned int)posix_perms,
3998                                                  strerror(errno)));
3999                                         free_canon_ace_list(file_ace_list);
4000                                         free_canon_ace_list(dir_ace_list);
4001                                         status = map_nt_error_from_unix(errno);
4002                                         goto out;
4003                                 }
4004                         }
4005                 }
4006         }
4007
4008         free_canon_ace_list(file_ace_list);
4009         free_canon_ace_list(dir_ace_list);
4010
4011         status = NT_STATUS_OK;
4012  out:
4013         TALLOC_FREE(smb_fname);
4014         return status;
4015 }
4016
4017 /****************************************************************************
4018  Get the actual group bits stored on a file with an ACL. Has no effect if
4019  the file has no ACL. Needed in dosmode code where the stat() will return
4020  the mask bits, not the real group bits, for a file with an ACL.
4021 ****************************************************************************/
4022
4023 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4024 {
4025         int entry_id = SMB_ACL_FIRST_ENTRY;
4026         SMB_ACL_ENTRY_T entry;
4027         SMB_ACL_T posix_acl;
4028         int result = -1;
4029
4030         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4031         if (posix_acl == (SMB_ACL_T)NULL)
4032                 return -1;
4033
4034         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4035                 SMB_ACL_TAG_T tagtype;
4036                 SMB_ACL_PERMSET_T permset;
4037
4038                 entry_id = SMB_ACL_NEXT_ENTRY;
4039
4040                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4041                         break;
4042
4043                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4044                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4045                                 break;
4046                         } else {
4047                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4048                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4049                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4050                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4051                                 result = 0;
4052                                 break;
4053                         }
4054                 }
4055         }
4056         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4057         return result;
4058 }
4059
4060 /****************************************************************************
4061  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4062  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4063 ****************************************************************************/
4064
4065 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4066 {
4067         int entry_id = SMB_ACL_FIRST_ENTRY;
4068         SMB_ACL_ENTRY_T entry;
4069         int num_entries = 0;
4070
4071         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4072                 SMB_ACL_TAG_T tagtype;
4073                 SMB_ACL_PERMSET_T permset;
4074                 mode_t perms;
4075
4076                 entry_id = SMB_ACL_NEXT_ENTRY;
4077
4078                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4079                         return -1;
4080
4081                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4082                         return -1;
4083
4084                 num_entries++;
4085
4086                 switch(tagtype) {
4087                         case SMB_ACL_USER_OBJ:
4088                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4089                                 break;
4090                         case SMB_ACL_GROUP_OBJ:
4091                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4092                                 break;
4093                         case SMB_ACL_MASK:
4094                                 /*
4095                                  * FIXME: The ACL_MASK entry permissions should really be set to
4096                                  * the union of the permissions of all ACL_USER,
4097                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4098                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4099                                  */
4100                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4101                                 break;
4102                         case SMB_ACL_OTHER:
4103                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4104                                 break;
4105                         default:
4106                                 continue;
4107                 }
4108
4109                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4110                         return -1;
4111
4112                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4113                         return -1;
4114         }
4115
4116         /*
4117          * If this is a simple 3 element ACL or no elements then it's a standard
4118          * UNIX permission set. Just use chmod...
4119          */
4120
4121         if ((num_entries == 3) || (num_entries == 0))
4122                 return -1;
4123
4124         return 0;
4125 }
4126
4127 /****************************************************************************
4128  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4129  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4130  resulting ACL on TO.  Note that name is in UNIX character set.
4131 ****************************************************************************/
4132
4133 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4134 {
4135         SMB_ACL_T posix_acl = NULL;
4136         int ret = -1;
4137
4138         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4139                 return -1;
4140
4141         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4142                 goto done;
4143
4144         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4145
4146  done:
4147
4148         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4149         return ret;
4150 }
4151
4152 /****************************************************************************
4153  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4154  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4155  Note that name is in UNIX character set.
4156 ****************************************************************************/
4157
4158 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4159 {
4160         return copy_access_posix_acl(conn, name, name, mode);
4161 }
4162
4163 /****************************************************************************
4164  Check for an existing default POSIX ACL on a directory.
4165 ****************************************************************************/
4166
4167 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4168 {
4169         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4170         bool has_acl = False;
4171         SMB_ACL_ENTRY_T entry;
4172
4173         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4174                 has_acl = True;
4175         }
4176
4177         if (def_acl) {
4178                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4179         }
4180         return has_acl;
4181 }
4182
4183 /****************************************************************************
4184  If the parent directory has no default ACL but it does have an Access ACL,
4185  inherit this Access ACL to file name.
4186 ****************************************************************************/
4187
4188 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4189                        const char *name, mode_t mode)
4190 {
4191         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4192                 return 0;
4193
4194         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4195 }
4196
4197 /****************************************************************************
4198  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4199  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4200 ****************************************************************************/
4201
4202 int fchmod_acl(files_struct *fsp, mode_t mode)
4203 {
4204         connection_struct *conn = fsp->conn;
4205         SMB_ACL_T posix_acl = NULL;
4206         int ret = -1;
4207
4208         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4209                 return -1;
4210
4211         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4212                 goto done;
4213
4214         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4215
4216   done:
4217
4218         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4219         return ret;
4220 }
4221
4222 /****************************************************************************
4223  Map from wire type to permset.
4224 ****************************************************************************/
4225
4226 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4227 {
4228         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4229                 return False;
4230         }
4231
4232         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4233                 return False;
4234         }
4235
4236         if (wire_perm & SMB_POSIX_ACL_READ) {
4237                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4238                         return False;
4239                 }
4240         }
4241         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4242                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4243                         return False;
4244                 }
4245         }
4246         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4247                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4248                         return False;
4249                 }
4250         }
4251         return True;
4252 }
4253
4254 /****************************************************************************
4255  Map from wire type to tagtype.
4256 ****************************************************************************/
4257
4258 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4259 {
4260         switch (wire_tt) {
4261                 case SMB_POSIX_ACL_USER_OBJ:
4262                         *p_tt = SMB_ACL_USER_OBJ;
4263                         break;
4264                 case SMB_POSIX_ACL_USER:
4265                         *p_tt = SMB_ACL_USER;
4266                         break;
4267                 case SMB_POSIX_ACL_GROUP_OBJ:
4268                         *p_tt = SMB_ACL_GROUP_OBJ;
4269                         break;
4270                 case SMB_POSIX_ACL_GROUP:
4271                         *p_tt = SMB_ACL_GROUP;
4272                         break;
4273                 case SMB_POSIX_ACL_MASK:
4274                         *p_tt = SMB_ACL_MASK;
4275                         break;
4276                 case SMB_POSIX_ACL_OTHER:
4277                         *p_tt = SMB_ACL_OTHER;
4278                         break;
4279                 default:
4280                         return False;
4281         }
4282         return True;
4283 }
4284
4285 /****************************************************************************
4286  Create a new POSIX acl from wire permissions.
4287  FIXME ! How does the share mask/mode fit into this.... ?
4288 ****************************************************************************/
4289
4290 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4291 {
4292         unsigned int i;
4293         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4294
4295         if (the_acl == NULL) {
4296                 return NULL;
4297         }
4298
4299         for (i = 0; i < num_acls; i++) {
4300                 SMB_ACL_ENTRY_T the_entry;
4301                 SMB_ACL_PERMSET_T the_permset;
4302                 SMB_ACL_TAG_T tag_type;
4303
4304                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4305                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4306                                 i, strerror(errno) ));
4307                         goto fail;
4308                 }
4309
4310                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4311                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4312                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4313                         goto fail;
4314                 }
4315
4316                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4317                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4318                                 i, strerror(errno) ));
4319                         goto fail;
4320                 }
4321
4322                 /* Get the permset pointer from the new ACL entry. */
4323                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4324                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4325                                 i, strerror(errno) ));
4326                         goto fail;
4327                 }
4328
4329                 /* Map from wire to permissions. */
4330                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4331                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4332                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4333                         goto fail;
4334                 }
4335
4336                 /* Now apply to the new ACL entry. */
4337                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4338                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4339                                 i, strerror(errno) ));
4340                         goto fail;
4341                 }
4342
4343                 if (tag_type == SMB_ACL_USER) {
4344                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4345                         uid_t uid = (uid_t)uidval;
4346                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4347                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4348                                         (unsigned int)uid, i, strerror(errno) ));
4349                                 goto fail;
4350                         }
4351                 }
4352
4353                 if (tag_type == SMB_ACL_GROUP) {
4354                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4355                         gid_t gid = (uid_t)gidval;
4356                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4357                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4358                                         (unsigned int)gid, i, strerror(errno) ));
4359                                 goto fail;
4360                         }
4361                 }
4362         }
4363
4364         return the_acl;
4365
4366  fail:
4367
4368         if (the_acl != NULL) {
4369                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4370         }
4371         return NULL;
4372 }
4373
4374 /****************************************************************************
4375  Calls from UNIX extensions - Default POSIX ACL set.
4376  If num_def_acls == 0 and not a directory just return. If it is a directory
4377  and num_def_acls == 0 then remove the default acl. Else set the default acl
4378  on the directory.
4379 ****************************************************************************/
4380
4381 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
4382                                 uint16 num_def_acls, const char *pdata)
4383 {
4384         SMB_ACL_T def_acl = NULL;
4385
4386         if (!S_ISDIR(psbuf->st_ex_mode)) {
4387                 if (num_def_acls) {
4388                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4389                         errno = EISDIR;
4390                         return False;
4391                 } else {
4392                         return True;
4393                 }
4394         }
4395
4396         if (!num_def_acls) {
4397                 /* Remove the default ACL. */
4398                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4399                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4400                                 fname, strerror(errno) ));
4401                         return False;
4402                 }
4403                 return True;
4404         }
4405
4406         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4407                 return False;
4408         }
4409
4410         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4411                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4412                         fname, strerror(errno) ));
4413                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4414                 return False;
4415         }
4416
4417         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4418         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4419         return True;
4420 }
4421
4422 /****************************************************************************
4423  Remove an ACL from a file. As we don't have acl_delete_entry() available
4424  we must read the current acl and copy all entries except MASK, USER and GROUP
4425  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4426  removed.
4427  FIXME ! How does the share mask/mode fit into this.... ?
4428 ****************************************************************************/
4429
4430 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4431 {
4432         SMB_ACL_T file_acl = NULL;
4433         int entry_id = SMB_ACL_FIRST_ENTRY;
4434         SMB_ACL_ENTRY_T entry;
4435         bool ret = False;
4436         /* Create a new ACL with only 3 entries, u/g/w. */
4437         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4438         SMB_ACL_ENTRY_T user_ent = NULL;
4439         SMB_ACL_ENTRY_T group_ent = NULL;
4440         SMB_ACL_ENTRY_T other_ent = NULL;
4441
4442         if (new_file_acl == NULL) {
4443                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4444                 return False;
4445         }
4446
4447         /* Now create the u/g/w entries. */
4448         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4449                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4450                         fname, strerror(errno) ));
4451                 goto done;
4452         }
4453         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4454                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4455                         fname, strerror(errno) ));
4456                 goto done;
4457         }
4458
4459         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4460                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4461                         fname, strerror(errno) ));
4462                 goto done;
4463         }
4464         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4465                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4466                         fname, strerror(errno) ));
4467                 goto done;
4468         }
4469
4470         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4471                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4472                         fname, strerror(errno) ));
4473                 goto done;
4474         }
4475         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4476                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4477                         fname, strerror(errno) ));
4478                 goto done;
4479         }
4480
4481         /* Get the current file ACL. */
4482         if (fsp && fsp->fh->fd != -1) {
4483                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4484         } else {
4485                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4486         }
4487
4488         if (file_acl == NULL) {
4489                 /* This is only returned if an error occurred. Even for a file with
4490                    no acl a u/g/w acl should be returned. */
4491                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4492                         fname, strerror(errno) ));
4493                 goto done;
4494         }
4495
4496         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4497                 SMB_ACL_TAG_T tagtype;
4498                 SMB_ACL_PERMSET_T permset;
4499
4500                 entry_id = SMB_ACL_NEXT_ENTRY;
4501
4502                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4503                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4504                                 fname, strerror(errno) ));
4505                         goto done;
4506                 }
4507
4508                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4509                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4510                                 fname, strerror(errno) ));
4511                         goto done;
4512                 }
4513
4514                 if (tagtype == SMB_ACL_USER_OBJ) {
4515                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4516                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4517                                         fname, strerror(errno) ));
4518                         }
4519                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4520                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4521                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4522                                         fname, strerror(errno) ));
4523                         }
4524                 } else if (tagtype == SMB_ACL_OTHER) {
4525                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4526                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4527                                         fname, strerror(errno) ));
4528                         }
4529                 }
4530         }
4531
4532         /* Set the new empty file ACL. */
4533         if (fsp && fsp->fh->fd != -1) {
4534                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4535                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4536                                 fname, strerror(errno) ));
4537                         goto done;
4538                 }
4539         } else {
4540                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4541                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4542                                 fname, strerror(errno) ));
4543                         goto done;
4544                 }
4545         }
4546
4547         ret = True;
4548
4549  done:
4550
4551         if (file_acl) {
4552                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4553         }
4554         if (new_file_acl) {
4555                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4556         }
4557         return ret;
4558 }
4559
4560 /****************************************************************************
4561  Calls from UNIX extensions - POSIX ACL set.
4562  If num_def_acls == 0 then read/modify/write acl after removing all entries
4563  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4564 ****************************************************************************/
4565
4566 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4567 {
4568         SMB_ACL_T file_acl = NULL;
4569
4570         if (!num_acls) {
4571                 /* Remove the ACL from the file. */
4572                 return remove_posix_acl(conn, fsp, fname);
4573         }
4574
4575         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4576                 return False;
4577         }
4578
4579         if (fsp && fsp->fh->fd != -1) {
4580                 /* The preferred way - use an open fd. */
4581                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4582                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4583                                 fname, strerror(errno) ));
4584                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4585                         return False;
4586                 }
4587         } else {
4588                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4589                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4590                                 fname, strerror(errno) ));
4591                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4592                         return False;
4593                 }
4594         }
4595
4596         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4597         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4598         return True;
4599 }
4600
4601 /********************************************************************
4602  Pull the NT ACL from a file on disk or the OpenEventlog() access
4603  check.  Caller is responsible for freeing the returned security
4604  descriptor via TALLOC_FREE().  This is designed for dealing with
4605  user space access checks in smbd outside of the VFS.  For example,
4606  checking access rights in OpenEventlog().
4607
4608  Assume we are dealing with files (for now)
4609 ********************************************************************/
4610
4611 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4612 {
4613         SEC_DESC *psd, *ret_sd;
4614         connection_struct *conn;
4615         files_struct finfo;
4616         struct fd_handle fh;
4617
4618         conn = TALLOC_ZERO_P(ctx, connection_struct);
4619         if (conn == NULL) {
4620                 DEBUG(0, ("talloc failed\n"));
4621                 return NULL;
4622         }
4623
4624         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4625                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4626                 TALLOC_FREE(conn);
4627                 return NULL;
4628         }
4629
4630         conn->params->service = -1;
4631
4632         set_conn_connectpath(conn, "/");
4633
4634         if (!smbd_vfs_init(conn)) {
4635                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4636                 conn_free_internal( conn );
4637                 return NULL;
4638         }
4639
4640         ZERO_STRUCT( finfo );
4641         ZERO_STRUCT( fh );
4642
4643         finfo.fnum = -1;
4644         finfo.conn = conn;
4645         finfo.fh = &fh;
4646         finfo.fh->fd = -1;
4647         finfo.fsp_name = CONST_DISCARD(char *,fname);
4648
4649         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4650                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4651                 conn_free_internal( conn );
4652                 return NULL;
4653         }
4654
4655         ret_sd = dup_sec_desc( ctx, psd );
4656
4657         conn_free_internal( conn );
4658
4659         return ret_sd;
4660 }