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 = interitable_mode
2170                 ? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name,
2171                              NULL )
2172                 : S_IRUSR;
2173
2174         if (fsp->is_directory)
2175                 mode |= (S_IWUSR|S_IXUSR);
2176
2177         /*
2178          * Now AND with the create mode/directory mode bits then OR with the
2179          * force create mode/force directory mode bits.
2180          */
2181
2182         if (fsp->is_directory) {
2183                 and_bits = lp_dir_security_mask(snum);
2184                 or_bits = lp_force_dir_security_mode(snum);
2185         } else {
2186                 and_bits = lp_security_mask(snum);
2187                 or_bits = lp_force_security_mode(snum);
2188         }
2189
2190         return ((mode & and_bits)|or_bits);
2191 }
2192
2193 /****************************************************************************
2194  Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2195  succeeding.
2196 ****************************************************************************/
2197
2198 static bool unpack_canon_ace(files_struct *fsp,
2199                                 SMB_STRUCT_STAT *pst,
2200                                 DOM_SID *pfile_owner_sid,
2201                                 DOM_SID *pfile_grp_sid,
2202                                 canon_ace **ppfile_ace,
2203                                 canon_ace **ppdir_ace,
2204                                 uint32 security_info_sent,
2205                                 const SEC_DESC *psd)
2206 {
2207         canon_ace *file_ace = NULL;
2208         canon_ace *dir_ace = NULL;
2209
2210         *ppfile_ace = NULL;
2211         *ppdir_ace = NULL;
2212
2213         if(security_info_sent == 0) {
2214                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2215                 return False;
2216         }
2217
2218         /*
2219          * If no DACL then this is a chown only security descriptor.
2220          */
2221
2222         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2223                 return True;
2224
2225         /*
2226          * Now go through the DACL and create the canon_ace lists.
2227          */
2228
2229         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2230                                                                 &file_ace, &dir_ace, psd->dacl))
2231                 return False;
2232
2233         if ((file_ace == NULL) && (dir_ace == NULL)) {
2234                 /* W2K traverse DACL set - ignore. */
2235                 return True;
2236         }
2237
2238         /*
2239          * Go through the canon_ace list and merge entries
2240          * belonging to identical users of identical allow or deny type.
2241          * We can do this as all deny entries come first, followed by
2242          * all allow entries (we have mandated this before accepting this acl).
2243          */
2244
2245         print_canon_ace_list( "file ace - before merge", file_ace);
2246         merge_aces( &file_ace );
2247
2248         print_canon_ace_list( "dir ace - before merge", dir_ace);
2249         merge_aces( &dir_ace );
2250
2251         /*
2252          * NT ACLs are order dependent. Go through the acl lists and
2253          * process DENY entries by masking the allow entries.
2254          */
2255
2256         print_canon_ace_list( "file ace - before deny", file_ace);
2257         process_deny_list( &file_ace);
2258
2259         print_canon_ace_list( "dir ace - before deny", dir_ace);
2260         process_deny_list( &dir_ace);
2261
2262         /*
2263          * A well formed POSIX file or default ACL has at least 3 entries, a
2264          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2265          * and optionally a mask entry. Ensure this is the case.
2266          */
2267
2268         print_canon_ace_list( "file ace - before valid", file_ace);
2269
2270         /*
2271          * A default 3 element mode entry for a file should be r-- --- ---.
2272          * A default 3 element mode entry for a directory should be rwx --- ---.
2273          */
2274
2275         pst->st_ex_mode = create_default_mode(fsp, False);
2276
2277         if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2278                 free_canon_ace_list(file_ace);
2279                 free_canon_ace_list(dir_ace);
2280                 return False;
2281         }
2282
2283         print_canon_ace_list( "dir ace - before valid", dir_ace);
2284
2285         /*
2286          * A default inheritable 3 element mode entry for a directory should be the
2287          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2288          * it's a directory.
2289          */
2290
2291         pst->st_ex_mode = create_default_mode(fsp, True);
2292
2293         if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2294                 free_canon_ace_list(file_ace);
2295                 free_canon_ace_list(dir_ace);
2296                 return False;
2297         }
2298
2299         print_canon_ace_list( "file ace - return", file_ace);
2300         print_canon_ace_list( "dir ace - return", dir_ace);
2301
2302         *ppfile_ace = file_ace;
2303         *ppdir_ace = dir_ace;
2304         return True;
2305
2306 }
2307
2308 /******************************************************************************
2309  When returning permissions, try and fit NT display
2310  semantics if possible. Note the the canon_entries here must have been malloced.
2311  The list format should be - first entry = owner, followed by group and other user
2312  entries, last entry = other.
2313
2314  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2315  are not ordered, and match on the most specific entry rather than walking a list,
2316  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2317
2318  Entry 0: owner : deny all except read and write.
2319  Entry 1: owner : allow read and write.
2320  Entry 2: group : deny all except read.
2321  Entry 3: group : allow read.
2322  Entry 4: Everyone : allow read.
2323
2324  But NT cannot display this in their ACL editor !
2325 ********************************************************************************/
2326
2327 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2328 {
2329         canon_ace *l_head = *pp_list_head;
2330         canon_ace *owner_ace = NULL;
2331         canon_ace *other_ace = NULL;
2332         canon_ace *ace = NULL;
2333
2334         for (ace = l_head; ace; ace = ace->next) {
2335                 if (ace->type == SMB_ACL_USER_OBJ)
2336                         owner_ace = ace;
2337                 else if (ace->type == SMB_ACL_OTHER) {
2338                         /* Last ace - this is "other" */
2339                         other_ace = ace;
2340                 }
2341         }
2342
2343         if (!owner_ace || !other_ace) {
2344                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2345                         filename ));
2346                 return;
2347         }
2348
2349         /*
2350          * The POSIX algorithm applies to owner first, and other last,
2351          * so ensure they are arranged in this order.
2352          */
2353
2354         if (owner_ace) {
2355                 DLIST_PROMOTE(l_head, owner_ace);
2356         }
2357
2358         if (other_ace) {
2359                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2360         }
2361
2362         /* We have probably changed the head of the list. */
2363
2364         *pp_list_head = l_head;
2365 }
2366
2367 /****************************************************************************
2368  Create a linked list of canonical ACE entries.
2369 ****************************************************************************/
2370
2371 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2372                                    const char *fname, SMB_ACL_T posix_acl,
2373                                    const SMB_STRUCT_STAT *psbuf,
2374                                    const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2375 {
2376         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2377         canon_ace *l_head = NULL;
2378         canon_ace *ace = NULL;
2379         canon_ace *next_ace = NULL;
2380         int entry_id = SMB_ACL_FIRST_ENTRY;
2381         SMB_ACL_ENTRY_T entry;
2382         size_t ace_count;
2383
2384         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2385                 SMB_ACL_TAG_T tagtype;
2386                 SMB_ACL_PERMSET_T permset;
2387                 DOM_SID sid;
2388                 posix_id unix_ug;
2389                 enum ace_owner owner_type;
2390
2391                 entry_id = SMB_ACL_NEXT_ENTRY;
2392
2393                 /* Is this a MASK entry ? */
2394                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2395                         continue;
2396
2397                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2398                         continue;
2399
2400                 /* Decide which SID to use based on the ACL type. */
2401                 switch(tagtype) {
2402                         case SMB_ACL_USER_OBJ:
2403                                 /* Get the SID from the owner. */
2404                                 sid_copy(&sid, powner);
2405                                 unix_ug.uid = psbuf->st_ex_uid;
2406                                 owner_type = UID_ACE;
2407                                 break;
2408                         case SMB_ACL_USER:
2409                                 {
2410                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2411                                         if (puid == NULL) {
2412                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2413                                                 continue;
2414                                         }
2415                                         /*
2416                                          * A SMB_ACL_USER entry for the owner is shadowed by the
2417                                          * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2418                                          * that entry, so we ignore it. We also don't create such
2419                                          * entries out of the blue when setting ACLs, so a get/set
2420                                          * cycle will drop them.
2421                                          */
2422                                         if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_ex_uid) {
2423                                                 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2424                                                 continue;
2425                                         }
2426                                         uid_to_sid( &sid, *puid);
2427                                         unix_ug.uid = *puid;
2428                                         owner_type = UID_ACE;
2429                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2430                                         break;
2431                                 }
2432                         case SMB_ACL_GROUP_OBJ:
2433                                 /* Get the SID from the owning group. */
2434                                 sid_copy(&sid, pgroup);
2435                                 unix_ug.gid = psbuf->st_ex_gid;
2436                                 owner_type = GID_ACE;
2437                                 break;
2438                         case SMB_ACL_GROUP:
2439                                 {
2440                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2441                                         if (pgid == NULL) {
2442                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2443                                                 continue;
2444                                         }
2445                                         gid_to_sid( &sid, *pgid);
2446                                         unix_ug.gid = *pgid;
2447                                         owner_type = GID_ACE;
2448                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2449                                         break;
2450                                 }
2451                         case SMB_ACL_MASK:
2452                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2453                                 continue; /* Don't count the mask as an entry. */
2454                         case SMB_ACL_OTHER:
2455                                 /* Use the Everyone SID */
2456                                 sid = global_sid_World;
2457                                 unix_ug.world = -1;
2458                                 owner_type = WORLD_ACE;
2459                                 break;
2460                         default:
2461                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2462                                 continue;
2463                 }
2464
2465                 /*
2466                  * Add this entry to the list.
2467                  */
2468
2469                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2470                         goto fail;
2471
2472                 ZERO_STRUCTP(ace);
2473                 ace->type = tagtype;
2474                 ace->perms = convert_permset_to_mode_t(conn, permset);
2475                 ace->attr = ALLOW_ACE;
2476                 ace->trustee = sid;
2477                 ace->unix_ug = unix_ug;
2478                 ace->owner_type = owner_type;
2479                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2480
2481                 DLIST_ADD(l_head, ace);
2482         }
2483
2484         /*
2485          * This next call will ensure we have at least a user/group/world set.
2486          */
2487
2488         if (!ensure_canon_entry_valid(&l_head, conn->params,
2489                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2490                                       psbuf, False))
2491                 goto fail;
2492
2493         /*
2494          * Now go through the list, masking the permissions with the
2495          * acl_mask. Ensure all DENY Entries are at the start of the list.
2496          */
2497
2498         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2499
2500         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2501                 next_ace = ace->next;
2502
2503                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2504                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2505                         ace->perms &= acl_mask;
2506
2507                 if (ace->perms == 0) {
2508                         DLIST_PROMOTE(l_head, ace);
2509                 }
2510
2511                 if( DEBUGLVL( 10 ) ) {
2512                         print_canon_ace(ace, ace_count);
2513                 }
2514         }
2515
2516         arrange_posix_perms(fname,&l_head );
2517
2518         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2519
2520         return l_head;
2521
2522   fail:
2523
2524         free_canon_ace_list(l_head);
2525         return NULL;
2526 }
2527
2528 /****************************************************************************
2529  Check if the current user group list contains a given group.
2530 ****************************************************************************/
2531
2532 static bool current_user_in_group(gid_t gid)
2533 {
2534         int i;
2535
2536         for (i = 0; i < current_user.ut.ngroups; i++) {
2537                 if (current_user.ut.groups[i] == gid) {
2538                         return True;
2539                 }
2540         }
2541
2542         return False;
2543 }
2544
2545 /****************************************************************************
2546  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2547 ****************************************************************************/
2548
2549 static bool acl_group_override(connection_struct *conn,
2550                                 const SMB_STRUCT_STAT *psbuf,
2551                                 const char *fname)
2552 {
2553         struct smb_filename *smb_fname = NULL;
2554         NTSTATUS status;
2555
2556         if ((errno != EPERM) && (errno != EACCES)) {
2557                 return false;
2558         }
2559
2560         /* file primary group == user primary or supplementary group */
2561         if (lp_acl_group_control(SNUM(conn)) &&
2562                         current_user_in_group(psbuf->st_ex_gid)) {
2563                 return true;
2564         }
2565
2566         status = create_synthetic_smb_fname_split(talloc_tos(), fname, psbuf,
2567                                                   &smb_fname);
2568
2569         if (!NT_STATUS_IS_OK(status)) {
2570                 return false;
2571         }
2572
2573         /* user has writeable permission */
2574         if (lp_dos_filemode(SNUM(conn)) &&
2575             can_write_to_file(conn, smb_fname)) {
2576                 TALLOC_FREE(smb_fname);
2577                 return true;
2578         }
2579         TALLOC_FREE(smb_fname);
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
2606 #if defined(POSIX_ACL_NEEDS_MASK)
2607         /* HP-UX always wants to have a mask (called "class" there). */
2608         needs_mask = True;
2609 #endif
2610
2611         if (the_acl == NULL) {
2612
2613                 if (!no_acl_syscall_error(errno)) {
2614                         /*
2615                          * Only print this error message if we have some kind of ACL
2616                          * support that's not working. Otherwise we would always get this.
2617                          */
2618                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2619                                 default_ace ? "default" : "file", strerror(errno) ));
2620                 }
2621                 *pacl_set_support = False;
2622                 return False;
2623         }
2624
2625         if( DEBUGLVL( 10 )) {
2626                 dbgtext("set_canon_ace_list: setting ACL:\n");
2627                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2628                         print_canon_ace( p_ace, i);
2629                 }
2630         }
2631
2632         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2633                 SMB_ACL_ENTRY_T the_entry;
2634                 SMB_ACL_PERMSET_T the_permset;
2635
2636                 /*
2637                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2638                  * named group entries. But if there is an ACL_MASK entry, it applies
2639                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2640                  * so that it doesn't deny (i.e., mask off) any permissions.
2641                  */
2642
2643                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2644                         needs_mask = True;
2645                         mask_perms |= p_ace->perms;
2646                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2647                         mask_perms |= p_ace->perms;
2648                 }
2649
2650                 /*
2651                  * Get the entry for this ACE.
2652                  */
2653
2654                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2655                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2656                                 i, strerror(errno) ));
2657                         goto fail;
2658                 }
2659
2660                 if (p_ace->type == SMB_ACL_MASK) {
2661                         mask_entry = the_entry;
2662                         got_mask_entry = True;
2663                 }
2664
2665                 /*
2666                  * Ok - we now know the ACL calls should be working, don't
2667                  * allow fallback to chmod.
2668                  */
2669
2670                 *pacl_set_support = True;
2671
2672                 /*
2673                  * Initialise the entry from the canon_ace.
2674                  */
2675
2676                 /*
2677                  * First tell the entry what type of ACE this is.
2678                  */
2679
2680                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2681                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2682                                 i, strerror(errno) ));
2683                         goto fail;
2684                 }
2685
2686                 /*
2687                  * Only set the qualifier (user or group id) if the entry is a user
2688                  * or group id ACE.
2689                  */
2690
2691                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2692                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2693                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2694                                         i, strerror(errno) ));
2695                                 goto fail;
2696                         }
2697                 }
2698
2699                 /*
2700                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2701                  */
2702
2703                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2704                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2705                                 i, strerror(errno) ));
2706                         goto fail;
2707                 }
2708
2709                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2710                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2711                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2712                         goto fail;
2713                 }
2714
2715                 /*
2716                  * ..and apply them to the entry.
2717                  */
2718
2719                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2720                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2721                                 i, strerror(errno) ));
2722                         goto fail;
2723                 }
2724
2725                 if( DEBUGLVL( 10 ))
2726                         print_canon_ace( p_ace, i);
2727
2728         }
2729
2730         if (needs_mask && !got_mask_entry) {
2731                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2732                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2733                         goto fail;
2734                 }
2735
2736                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2737                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2738                         goto fail;
2739                 }
2740
2741                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2742                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2743                         goto fail;
2744                 }
2745
2746                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2747                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2748                         goto fail;
2749                 }
2750
2751                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2752                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2753                         goto fail;
2754                 }
2755         }
2756
2757         /*
2758          * Finally apply it to the file or directory.
2759          */
2760
2761         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2762                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2763                         /*
2764                          * Some systems allow all the above calls and only fail with no ACL support
2765                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2766                          */
2767                         if (no_acl_syscall_error(errno)) {
2768                                 *pacl_set_support = False;
2769                         }
2770
2771                         if (acl_group_override(conn, psbuf, fsp->fsp_name)) {
2772                                 int sret;
2773
2774                                 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2775                                         fsp->fsp_name ));
2776
2777                                 become_root();
2778                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl);
2779                                 unbecome_root();
2780                                 if (sret == 0) {
2781                                         ret = True;
2782                                 }
2783                         }
2784
2785                         if (ret == False) {
2786                                 DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2787                                                 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2788                                                 fsp->fsp_name, strerror(errno) ));
2789                                 goto fail;
2790                         }
2791                 }
2792         } else {
2793                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2794                         /*
2795                          * Some systems allow all the above calls and only fail with no ACL support
2796                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2797                          */
2798                         if (no_acl_syscall_error(errno)) {
2799                                 *pacl_set_support = False;
2800                         }
2801
2802                         if (acl_group_override(conn, psbuf, fsp->fsp_name)) {
2803                                 int sret;
2804
2805                                 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2806                                         fsp->fsp_name ));
2807
2808                                 become_root();
2809                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2810                                 unbecome_root();
2811                                 if (sret == 0) {
2812                                         ret = True;
2813                                 }
2814                         }
2815
2816                         if (ret == False) {
2817                                 DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2818                                                 fsp->fsp_name, strerror(errno) ));
2819                                 goto fail;
2820                         }
2821                 }
2822         }
2823
2824         ret = True;
2825
2826   fail:
2827
2828         if (the_acl != NULL) {
2829                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2830         }
2831
2832         return ret;
2833 }
2834
2835 /****************************************************************************
2836  Find a particular canon_ace entry.
2837 ****************************************************************************/
2838
2839 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2840 {
2841         while (list) {
2842                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2843                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2844                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2845                         break;
2846                 list = list->next;
2847         }
2848         return list;
2849 }
2850
2851 /****************************************************************************
2852
2853 ****************************************************************************/
2854
2855 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2856 {
2857         SMB_ACL_ENTRY_T entry;
2858
2859         if (!the_acl)
2860                 return NULL;
2861         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2862                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2863                 return NULL;
2864         }
2865         return the_acl;
2866 }
2867
2868 /****************************************************************************
2869  Convert a canon_ace to a generic 3 element permission - if possible.
2870 ****************************************************************************/
2871
2872 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2873
2874 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2875 {
2876         int snum = SNUM(fsp->conn);
2877         size_t ace_count = count_canon_ace_list(file_ace_list);
2878         canon_ace *ace_p;
2879         canon_ace *owner_ace = NULL;
2880         canon_ace *group_ace = NULL;
2881         canon_ace *other_ace = NULL;
2882         mode_t and_bits;
2883         mode_t or_bits;
2884
2885         if (ace_count != 3) {
2886                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2887 posix perms.\n", fsp->fsp_name ));
2888                 return False;
2889         }
2890
2891         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2892                 if (ace_p->owner_type == UID_ACE)
2893                         owner_ace = ace_p;
2894                 else if (ace_p->owner_type == GID_ACE)
2895                         group_ace = ace_p;
2896                 else if (ace_p->owner_type == WORLD_ACE)
2897                         other_ace = ace_p;
2898         }
2899
2900         if (!owner_ace || !group_ace || !other_ace) {
2901                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2902                                 fsp->fsp_name ));
2903                 return False;
2904         }
2905
2906         *posix_perms = (mode_t)0;
2907
2908         *posix_perms |= owner_ace->perms;
2909         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2910         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2911         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2912         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2913         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2914         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2915
2916         /* The owner must have at least read access. */
2917
2918         *posix_perms |= S_IRUSR;
2919         if (fsp->is_directory)
2920                 *posix_perms |= (S_IWUSR|S_IXUSR);
2921
2922         /* If requested apply the masks. */
2923
2924         /* Get the initial bits to apply. */
2925
2926         if (fsp->is_directory) {
2927                 and_bits = lp_dir_security_mask(snum);
2928                 or_bits = lp_force_dir_security_mode(snum);
2929         } else {
2930                 and_bits = lp_security_mask(snum);
2931                 or_bits = lp_force_security_mode(snum);
2932         }
2933
2934         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2935
2936         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2937                 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2938                 fsp->fsp_name ));
2939
2940         return True;
2941 }
2942
2943 /****************************************************************************
2944   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2945   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2946   with CI|OI set so it is inherited and also applies to the directory.
2947   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2948 ****************************************************************************/
2949
2950 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2951 {
2952         size_t i, j;
2953
2954         for (i = 0; i < num_aces; i++) {
2955                 for (j = i+1; j < num_aces; j++) {
2956                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2957                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2958                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2959                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2960
2961                         /* We know the lower number ACE's are file entries. */
2962                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2963                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2964                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2965                                 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2966                                 (i_inh == j_inh) &&
2967                                 (i_flags_ni == 0) &&
2968                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2969                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
2970                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
2971                                 /*
2972                                  * W2K wants to have access allowed zero access ACE's
2973                                  * at the end of the list. If the mask is zero, merge
2974                                  * the non-inherited ACE onto the inherited ACE.
2975                                  */
2976
2977                                 if (nt_ace_list[i].access_mask == 0) {
2978                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2979                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2980                                         if (num_aces - i - 1 > 0)
2981                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2982                                                                 sizeof(SEC_ACE));
2983
2984                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2985                                                 (unsigned int)i, (unsigned int)j ));
2986                                 } else {
2987                                         /*
2988                                          * These are identical except for the flags.
2989                                          * Merge the inherited ACE onto the non-inherited ACE.
2990                                          */
2991
2992                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2993                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2994                                         if (num_aces - j - 1 > 0)
2995                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
2996                                                                 sizeof(SEC_ACE));
2997
2998                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
2999                                                 (unsigned int)j, (unsigned int)i ));
3000                                 }
3001                                 num_aces--;
3002                                 break;
3003                         }
3004                 }
3005         }
3006
3007         return num_aces;
3008 }
3009
3010 /*
3011  * Add or Replace ACE entry.
3012  * In some cases we need to add a specific ACE for compatibility reasons.
3013  * When doing that we must make sure we are not actually creating a duplicate
3014  * entry. So we need to search whether an ACE entry already exist and eventually
3015  * replacce the access mask, or add a completely new entry if none was found.
3016  *
3017  * This function assumes the array has enough space to add a new entry without
3018  * any reallocation of memory.
3019  */
3020
3021 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3022                                 const DOM_SID *sid, enum security_ace_type type,
3023                                 uint32_t mask, uint8_t flags)
3024 {
3025         int i;
3026
3027         /* first search for a duplicate */
3028         for (i = 0; i < *num_aces; i++) {
3029                 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3030                     (nt_ace_list[i].flags == flags)) break;
3031         }
3032
3033         if (i < *num_aces) { /* found */
3034                 nt_ace_list[i].type = type;
3035                 nt_ace_list[i].access_mask = mask;
3036                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3037                            i, sid_string_dbg(sid), flags));
3038                 return;
3039         }
3040
3041         /* not found, append it */
3042         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3043 }
3044
3045
3046 /****************************************************************************
3047  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3048  the space for the return elements and returns the size needed to return the
3049  security descriptor. This should be the only external function needed for
3050  the UNIX style get ACL.
3051 ****************************************************************************/
3052
3053 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3054                                       const char *name,
3055                                       const SMB_STRUCT_STAT *sbuf,
3056                                       struct pai_val *pal,
3057                                       SMB_ACL_T posix_acl,
3058                                       SMB_ACL_T def_acl,
3059                                       uint32_t security_info,
3060                                       SEC_DESC **ppdesc)
3061 {
3062         DOM_SID owner_sid;
3063         DOM_SID group_sid;
3064         size_t sd_size = 0;
3065         SEC_ACL *psa = NULL;
3066         size_t num_acls = 0;
3067         size_t num_def_acls = 0;
3068         size_t num_aces = 0;
3069         canon_ace *file_ace = NULL;
3070         canon_ace *dir_ace = NULL;
3071         SEC_ACE *nt_ace_list = NULL;
3072         size_t num_profile_acls = 0;
3073         DOM_SID orig_owner_sid;
3074         SEC_DESC *psd = NULL;
3075         int i;
3076
3077         /*
3078          * Get the owner, group and world SIDs.
3079          */
3080
3081         create_file_sids(sbuf, &owner_sid, &group_sid);
3082
3083         if (lp_profile_acls(SNUM(conn))) {
3084                 /* For WXP SP1 the owner must be administrators. */
3085                 sid_copy(&orig_owner_sid, &owner_sid);
3086                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3087                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3088                 num_profile_acls = 3;
3089         }
3090
3091         if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3092
3093                 /*
3094                  * In the optimum case Creator Owner and Creator Group would be used for
3095                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3096                  * would lead to usability problems under Windows: The Creator entries
3097                  * are only available in browse lists of directories and not for files;
3098                  * additionally the