source3/smbd/posix_acls.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB NT Security Descriptor / Unix permission conversion.
   4    Copyright (C) Jeremy Allison 1994-2000.
   5    Copyright (C) Andreas Gruenbacher 2002.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22
  23 extern struct current_user current_user;
  24 extern const struct generic_mapping file_generic_mapping;
  25
  26 #undef  DBGC_CLASS
  27 #define DBGC_CLASS DBGC_ACLS
  28
  29 /****************************************************************************
  30  Data structures representing the internal ACE format.
  31 ****************************************************************************/
  32
  33 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  34 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  35
  36 typedef union posix_id {
  37                 uid_t uid;
  38                 gid_t gid;
  39                 int world;
  40 } posix_id;
  41
  42 typedef struct canon_ace {
  43         struct canon_ace *next, *prev;
  44         SMB_ACL_TAG_T type;
  45         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  46         DOM_SID trustee;
  47         enum ace_owner owner_type;
  48         enum ace_attribute attr;
  49         posix_id unix_ug;
  50         bool inherited;
  51 } canon_ace;
  52
  53 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  54
  55 /*
  56  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  57  * attribute on disk.
  58  *
  59  * |  1   |  1   |   2         |         2           |  ....
  60  * +------+------+-------------+---------------------+-------------+--------------------+
  61  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  62  * +------+------+-------------+---------------------+-------------+--------------------+
  63  */
  64
  65 #define PAI_VERSION_OFFSET      0
  66 #define PAI_FLAG_OFFSET         1
  67 #define PAI_NUM_ENTRIES_OFFSET  2
  68 #define PAI_NUM_DEFAULT_ENTRIES_OFFSET  4
  69 #define PAI_ENTRIES_BASE        6
  70
  71 #define PAI_VERSION             1
  72 #define PAI_ACL_FLAG_PROTECTED  0x1
  73 #define PAI_ENTRY_LENGTH        5
  74
  75 /*
  76  * In memory format of user.SAMBA_PAI attribute.
  77  */
  78
  79 struct pai_entry {
  80         struct pai_entry *next, *prev;
  81         enum ace_owner owner_type;
  82         posix_id unix_ug;
  83 };
  84
  85 struct pai_val {
  86         bool pai_protected;
  87         unsigned int num_entries;
  88         struct pai_entry *entry_list;
  89         unsigned int num_def_entries;
  90         struct pai_entry *def_entry_list;
  91 };
  92
  93 /************************************************************************
  94  Return a uint32 of the pai_entry principal.
  95 ************************************************************************/
  96
  97 static uint32 get_pai_entry_val(struct pai_entry *paie)
  98 {
  99         switch (paie->owner_type) {
 100                 case UID_ACE:
 101                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 102                         return (uint32)paie->unix_ug.uid;
 103                 case GID_ACE:
 104                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 105                         return (uint32)paie->unix_ug.gid;
 106                 case WORLD_ACE:
 107                 default:
 108                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 109                         return (uint32)-1;
 110         }
 111 }
 112
 113 /************************************************************************
 114  Return a uint32 of the entry principal.
 115 ************************************************************************/
 116
 117 static uint32 get_entry_val(canon_ace *ace_entry)
 118 {
 119         switch (ace_entry->owner_type) {
 120                 case UID_ACE:
 121                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
 122                         return (uint32)ace_entry->unix_ug.uid;
 123                 case GID_ACE:
 124                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
 125                         return (uint32)ace_entry->unix_ug.gid;
 126                 case WORLD_ACE:
 127                 default:
 128                         DEBUG(10,("get_entry_val: world ace\n"));
 129                         return (uint32)-1;
 130         }
 131 }
 132
 133 /************************************************************************
 134  Count the inherited entries.
 135 ************************************************************************/
 136
 137 static unsigned int num_inherited_entries(canon_ace *ace_list)
 138 {
 139         unsigned int num_entries = 0;
 140
 141         for (; ace_list; ace_list = ace_list->next)
 142                 if (ace_list->inherited)
 143                         num_entries++;
 144         return num_entries;
 145 }
 146
 147 /************************************************************************
 148  Create the on-disk format. Caller must free.
 149 ************************************************************************/
 150
 151 static char *create_pai_buf(canon_ace *file_ace_list, canon_ace *dir_ace_list, bool pai_protected, size_t *store_size)
 152 {
 153         char *pai_buf = NULL;
 154         canon_ace *ace_list = NULL;
 155         char *entry_offset = NULL;
 156         unsigned int num_entries = 0;
 157         unsigned int num_def_entries = 0;
 158
 159         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next)
 160                 if (ace_list->inherited)
 161                         num_entries++;
 162
 163         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next)
 164                 if (ace_list->inherited)
 165                         num_def_entries++;
 166
 167         DEBUG(10,("create_pai_buf: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 168
 169         *store_size = PAI_ENTRIES_BASE + ((num_entries + num_def_entries)*PAI_ENTRY_LENGTH);
 170
 171         pai_buf = (char *)SMB_MALLOC(*store_size);
 172         if (!pai_buf) {
 173                 return NULL;
 174         }
 175
 176         /* Set up the header. */
 177         memset(pai_buf, '\0', PAI_ENTRIES_BASE);
 178         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_VERSION);
 179         SCVAL(pai_buf,PAI_FLAG_OFFSET,(pai_protected ? PAI_ACL_FLAG_PROTECTED : 0));
 180         SSVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET,num_entries);
 181         SSVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 182
 183         entry_offset = pai_buf + PAI_ENTRIES_BASE;
 184
 185         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 186                 if (ace_list->inherited) {
 187                         uint8 type_val = (unsigned char)ace_list->owner_type;
 188                         uint32 entry_val = get_entry_val(ace_list);
 189
 190                         SCVAL(entry_offset,0,type_val);
 191                         SIVAL(entry_offset,1,entry_val);
 192                         entry_offset += PAI_ENTRY_LENGTH;
 193                 }
 194         }
 195
 196         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 197                 if (ace_list->inherited) {
 198                         uint8 type_val = (unsigned char)ace_list->owner_type;
 199                         uint32 entry_val = get_entry_val(ace_list);
 200
 201                         SCVAL(entry_offset,0,type_val);
 202                         SIVAL(entry_offset,1,entry_val);
 203                         entry_offset += PAI_ENTRY_LENGTH;
 204                 }
 205         }
 206
 207         return pai_buf;
 208 }
 209
 210 /************************************************************************
 211  Store the user.SAMBA_PAI attribute on disk.
 212 ************************************************************************/
 213
 214 static void store_inheritance_attributes(files_struct *fsp, canon_ace *file_ace_list,
 215                                         canon_ace *dir_ace_list, bool pai_protected)
 216 {
 217         int ret;
 218         size_t store_size;
 219         char *pai_buf;
 220
 221         if (!lp_map_acl_inherit(SNUM(fsp->conn)))
 222                 return;
 223
 224         /*
 225          * Don't store if this ACL isn't protected and
 226          * none of the entries in it are marked as inherited.
 227          */
 228
 229         if (!pai_protected && num_inherited_entries(file_ace_list) == 0 && num_inherited_entries(dir_ace_list) == 0) {
 230                 /* Instead just remove the attribute if it exists. */
 231                 if (fsp->fh->fd != -1)
 232                         SMB_VFS_FREMOVEXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME);
 233                 else
 234                         SMB_VFS_REMOVEXATTR(fsp->conn, fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME);
 235                 return;
 236         }
 237
 238         pai_buf = create_pai_buf(file_ace_list, dir_ace_list, pai_protected, &store_size);
 239
 240         if (fsp->fh->fd != -1)
 241                 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 242                                 pai_buf, store_size, 0);
 243         else
 244                 ret = SMB_VFS_SETXATTR(fsp->conn,fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME,
 245                                 pai_buf, store_size, 0);
 246
 247         SAFE_FREE(pai_buf);
 248
 249         DEBUG(10,("store_inheritance_attribute:%s for file %s\n", pai_protected ? " (protected)" : "", fsp->fsp_name));
 250         if (ret == -1 && !no_acl_syscall_error(errno))
 251                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 252 }
 253
 254 /************************************************************************
 255  Delete the in memory inheritance info.
 256 ************************************************************************/
 257
 258 static void free_inherited_info(struct pai_val *pal)
 259 {
 260         if (pal) {
 261                 struct pai_entry *paie, *paie_next;
 262                 for (paie = pal->entry_list; paie; paie = paie_next) {
 263                         paie_next = paie->next;
 264                         SAFE_FREE(paie);
 265                 }
 266                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 267                         paie_next = paie->next;
 268                         SAFE_FREE(paie);
 269                 }
 270                 SAFE_FREE(pal);
 271         }
 272 }
 273
 274 /************************************************************************
 275  Was this ACL protected ?
 276 ************************************************************************/
 277
 278 static bool get_protected_flag(struct pai_val *pal)
 279 {
 280         if (!pal)
 281                 return False;
 282         return pal->pai_protected;
 283 }
 284
 285 /************************************************************************
 286  Was this ACE inherited ?
 287 ************************************************************************/
 288
 289 static bool get_inherited_flag(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
 290 {
 291         struct pai_entry *paie;
 292
 293         if (!pal)
 294                 return False;
 295
 296         /* If the entry exists it is inherited. */
 297         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 298                 if (ace_entry->owner_type == paie->owner_type &&
 299                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 300                         return True;
 301         }
 302         return False;
 303 }
 304
 305 /************************************************************************
 306  Ensure an attribute just read is valid.
 307 ************************************************************************/
 308
 309 static bool check_pai_ok(char *pai_buf, size_t pai_buf_data_size)
 310 {
 311         uint16 num_entries;
 312         uint16 num_def_entries;
 313
 314         if (pai_buf_data_size < PAI_ENTRIES_BASE) {
 315                 /* Corrupted - too small. */
 316                 return False;
 317         }
 318
 319         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_VERSION)
 320                 return False;
 321
 322         num_entries = SVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET);
 323         num_def_entries = SVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
 324
 325         /* Check the entry lists match. */
 326         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 327
 328         if (((num_entries + num_def_entries)*PAI_ENTRY_LENGTH) + PAI_ENTRIES_BASE != pai_buf_data_size)
 329                 return False;
 330
 331         return True;
 332 }
 333
 334
 335 /************************************************************************
 336  Convert to in-memory format.
 337 ************************************************************************/
 338
 339 static struct pai_val *create_pai_val(char *buf, size_t size)
 340 {
 341         char *entry_offset;
 342         struct pai_val *paiv = NULL;
 343         int i;
 344
 345         if (!check_pai_ok(buf, size))
 346                 return NULL;
 347
 348         paiv = SMB_MALLOC_P(struct pai_val);
 349         if (!paiv)
 350                 return NULL;
 351
 352         memset(paiv, '\0', sizeof(struct pai_val));
 353
 354         paiv->pai_protected = (CVAL(buf,PAI_FLAG_OFFSET) == PAI_ACL_FLAG_PROTECTED);
 355
 356         paiv->num_entries = SVAL(buf,PAI_NUM_ENTRIES_OFFSET);
 357         paiv->num_def_entries = SVAL(buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
 358
 359         entry_offset = buf + PAI_ENTRIES_BASE;
 360
 361         DEBUG(10,("create_pai_val:%s num_entries = %u, num_def_entries = %u\n",
 362                         paiv->pai_protected ? " (pai_protected)" : "", paiv->num_entries, paiv->num_def_entries ));
 363
 364         for (i = 0; i < paiv->num_entries; i++) {
 365                 struct pai_entry *paie;
 366
 367                 paie = SMB_MALLOC_P(struct pai_entry);
 368                 if (!paie) {
 369                         free_inherited_info(paiv);
 370                         return NULL;
 371                 }
 372
 373                 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 374                 switch( paie->owner_type) {
 375                         case UID_ACE:
 376                                 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 377                                 DEBUG(10,("create_pai_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 378                                 break;
 379                         case GID_ACE:
 380                                 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 381                                 DEBUG(10,("create_pai_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 382                                 break;
 383                         case WORLD_ACE:
 384                                 paie->unix_ug.world = -1;
 385                                 DEBUG(10,("create_pai_val: world ace\n"));
 386                                 break;
 387                         default:
 388                                 free_inherited_info(paiv);
 389                                 return NULL;
 390                 }
 391                 entry_offset += PAI_ENTRY_LENGTH;
 392                 DLIST_ADD(paiv->entry_list, paie);
 393         }
 394
 395         for (i = 0; i < paiv->num_def_entries; i++) {
 396                 struct pai_entry *paie;
 397
 398                 paie = SMB_MALLOC_P(struct pai_entry);
 399                 if (!paie) {
 400                         free_inherited_info(paiv);
 401                         return NULL;
 402                 }
 403
 404                 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 405                 switch( paie->owner_type) {
 406                         case UID_ACE:
 407                                 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 408                                 DEBUG(10,("create_pai_val: (def) uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 409                                 break;
 410                         case GID_ACE:
 411                                 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 412                                 DEBUG(10,("create_pai_val: (def) gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 413                                 break;
 414                         case WORLD_ACE:
 415                                 paie->unix_ug.world = -1;
 416                                 DEBUG(10,("create_pai_val: (def) world ace\n"));
 417                                 break;
 418                         default:
 419                                 free_inherited_info(paiv);
 420                                 return NULL;
 421                 }
 422                 entry_offset += PAI_ENTRY_LENGTH;
 423                 DLIST_ADD(paiv->def_entry_list, paie);
 424         }
 425
 426         return paiv;
 427 }
 428
 429 /************************************************************************
 430  Load the user.SAMBA_PAI attribute.
 431 ************************************************************************/
 432
 433 static struct pai_val *fload_inherited_info(files_struct *fsp)
 434 {
 435         char *pai_buf;
 436         size_t pai_buf_size = 1024;
 437         struct pai_val *paiv = NULL;
 438         ssize_t ret;
 439
 440         if (!lp_map_acl_inherit(SNUM(fsp->conn)))
 441                 return NULL;
 442
 443         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 444                 return NULL;
 445
 446         do {
 447                 if (fsp->fh->fd != -1)
 448                         ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 449                                         pai_buf, pai_buf_size);
 450                 else
 451                         ret = SMB_VFS_GETXATTR(fsp->conn,fsp->fsp_name,SAMBA_POSIX_INHERITANCE_EA_NAME,
 452                                         pai_buf, pai_buf_size);
 453
 454                 if (ret == -1) {
 455                         if (errno != ERANGE) {
 456                                 break;
 457                         }
 458                         /* Buffer too small - enlarge it. */
 459                         pai_buf_size *= 2;
 460                         SAFE_FREE(pai_buf);
 461                         if (pai_buf_size > 1024*1024) {
 462                                 return NULL; /* Limit malloc to 1mb. */
 463                         }
 464                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 465                                 return NULL;
 466                 }
 467         } while (ret == -1);
 468
 469         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fsp->fsp_name));
 470
 471         if (ret == -1) {
 472                 /* No attribute or not supported. */
 473 #if defined(ENOATTR)
 474                 if (errno != ENOATTR)
 475                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 476 #else
 477                 if (errno != ENOSYS)
 478                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 479 #endif
 480                 SAFE_FREE(pai_buf);
 481                 return NULL;
 482         }
 483
 484         paiv = create_pai_val(pai_buf, ret);
 485
 486         if (paiv && paiv->pai_protected)
 487                 DEBUG(10,("load_inherited_info: ACL is protected for file %s\n", fsp->fsp_name));
 488
 489         SAFE_FREE(pai_buf);
 490         return paiv;
 491 }
 492
 493 /************************************************************************
 494  Load the user.SAMBA_PAI attribute.
 495 ************************************************************************/
 496
 497 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
 498                                            const char *fname)
 499 {
 500         char *pai_buf;
 501         size_t pai_buf_size = 1024;
 502         struct pai_val *paiv = NULL;
 503         ssize_t ret;
 504
 505         if (!lp_map_acl_inherit(SNUM(conn))) {
 506                 return NULL;
 507         }
 508
 509         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 510                 return NULL;
 511         }
 512
 513         do {
 514                 ret = SMB_VFS_GETXATTR(conn, fname,
 515                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 516                                        pai_buf, pai_buf_size);
 517
 518                 if (ret == -1) {
 519                         if (errno != ERANGE) {
 520                                 break;
 521                         }
 522                         /* Buffer too small - enlarge it. */
 523                         pai_buf_size *= 2;
 524                         SAFE_FREE(pai_buf);
 525                         if (pai_buf_size > 1024*1024) {
 526                                 return NULL; /* Limit malloc to 1mb. */
 527                         }
 528                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 529                                 return NULL;
 530                 }
 531         } while (ret == -1);
 532
 533         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
 534
 535         if (ret == -1) {
 536                 /* No attribute or not supported. */
 537 #if defined(ENOATTR)
 538                 if (errno != ENOATTR)
 539                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 540 #else
 541                 if (errno != ENOSYS)
 542                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 543 #endif
 544                 SAFE_FREE(pai_buf);
 545                 return NULL;
 546         }
 547
 548         paiv = create_pai_val(pai_buf, ret);
 549
 550         if (paiv && paiv->pai_protected) {
 551                 DEBUG(10,("load_inherited_info: ACL is protected for file %s\n", fname));
 552         }
 553
 554         SAFE_FREE(pai_buf);
 555         return paiv;
 556 }
 557
 558 /****************************************************************************
 559  Functions to manipulate the internal ACE format.
 560 ****************************************************************************/
 561
 562 /****************************************************************************
 563  Count a linked list of canonical ACE entries.
 564 ****************************************************************************/
 565
 566 static size_t count_canon_ace_list( canon_ace *list_head )
 567 {
 568         size_t count = 0;
 569         canon_ace *ace;
 570
 571         for (ace = list_head; ace; ace = ace->next)
 572                 count++;
 573
 574         return count;
 575 }
 576
 577 /****************************************************************************
 578  Free a linked list of canonical ACE entries.
 579 ****************************************************************************/
 580
 581 static void free_canon_ace_list( canon_ace *list_head )
 582 {
 583         canon_ace *list, *next;
 584
 585         for (list = list_head; list; list = next) {
 586                 next = list->next;
 587                 DLIST_REMOVE(list_head, list);
 588                 SAFE_FREE(list);
 589         }
 590 }
 591
 592 /****************************************************************************
 593  Function to duplicate a canon_ace entry.
 594 ****************************************************************************/
 595
 596 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 597 {
 598         canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
 599
 600         if (dst_ace == NULL)
 601                 return NULL;
 602
 603         *dst_ace = *src_ace;
 604         dst_ace->prev = dst_ace->next = NULL;
 605         return dst_ace;
 606 }
 607
 608 /****************************************************************************
 609  Print out a canon ace.
 610 ****************************************************************************/
 611
 612 static void print_canon_ace(canon_ace *pace, int num)
 613 {
 614         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 615         dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
 616         if (pace->owner_type == UID_ACE) {
 617                 const char *u_name = uidtoname(pace->unix_ug.uid);
 618                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
 619         } else if (pace->owner_type == GID_ACE) {
 620                 char *g_name = gidtoname(pace->unix_ug.gid);
 621                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
 622         } else
 623                 dbgtext( "other ");
 624         switch (pace->type) {
 625                 case SMB_ACL_USER:
 626                         dbgtext( "SMB_ACL_USER ");
 627                         break;
 628                 case SMB_ACL_USER_OBJ:
 629                         dbgtext( "SMB_ACL_USER_OBJ ");
 630                         break;
 631                 case SMB_ACL_GROUP:
 632                         dbgtext( "SMB_ACL_GROUP ");
 633                         break;
 634                 case SMB_ACL_GROUP_OBJ:
 635                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 636                         break;
 637                 case SMB_ACL_OTHER:
 638                         dbgtext( "SMB_ACL_OTHER ");
 639                         break;
 640                 default:
 641                         dbgtext( "MASK " );
 642                         break;
 643         }
 644         if (pace->inherited)
 645                 dbgtext( "(inherited) ");
 646         dbgtext( "perms ");
 647         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 648         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 649         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 650 }
 651
 652 /****************************************************************************
 653  Print out a canon ace list.
 654 ****************************************************************************/
 655
 656 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 657 {
 658         int count = 0;
 659
 660         if( DEBUGLVL( 10 )) {
 661                 dbgtext( "print_canon_ace_list: %s\n", name );
 662                 for (;ace_list; ace_list = ace_list->next, count++)
 663                         print_canon_ace(ace_list, count );
 664         }
 665 }
 666
 667 /****************************************************************************
 668  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 669 ****************************************************************************/
 670
 671 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
 672 {
 673         mode_t ret = 0;
 674
 675         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
 676         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 677         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 678
 679         return ret;
 680 }
 681
 682 /****************************************************************************
 683  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 684 ****************************************************************************/
 685
 686 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 687 {
 688         mode_t ret = 0;
 689
 690         if (mode & r_mask)
 691                 ret |= S_IRUSR;
 692         if (mode & w_mask)
 693                 ret |= S_IWUSR;
 694         if (mode & x_mask)
 695                 ret |= S_IXUSR;
 696
 697         return ret;
 698 }
 699
 700 /****************************************************************************
 701  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 702  an SMB_ACL_PERMSET_T.
 703 ****************************************************************************/
 704
 705 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 706 {
 707         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1)
 708                 return -1;
 709         if (mode & S_IRUSR) {
 710                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
 711                         return -1;
 712         }
 713         if (mode & S_IWUSR) {
 714                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
 715                         return -1;
 716         }
 717         if (mode & S_IXUSR) {
 718                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
 719                         return -1;
 720         }
 721         return 0;
 722 }
 723
 724 /****************************************************************************
 725  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 726 ****************************************************************************/
 727
 728 static void create_file_sids(const SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
 729 {
 730         uid_to_sid( powner_sid, psbuf->st_uid );
 731         gid_to_sid( pgroup_sid, psbuf->st_gid );
 732 }
 733
 734 /****************************************************************************
 735  Is the identity in two ACEs equal ? Check both SID and uid/gid.
 736 ****************************************************************************/
 737
 738 static bool identity_in_ace_equal(canon_ace *ace1, canon_ace *ace2)
 739 {
 740         if (sid_equal(&ace1->trustee, &ace2->trustee)) {
 741                 return True;
 742         }
 743         if (ace1->owner_type == ace2->owner_type) {
 744                 if (ace1->owner_type == UID_ACE &&
 745                                 ace1->unix_ug.uid == ace2->unix_ug.uid) {
 746                         return True;
 747                 } else if (ace1->owner_type == GID_ACE &&
 748                                 ace1->unix_ug.gid == ace2->unix_ug.gid) {
 749                         return True;
 750                 }
 751         }
 752         return False;
 753 }
 754
 755 /****************************************************************************
 756  Merge aces with a common sid - if both are allow or deny, OR the permissions together and
 757  delete the second one. If the first is deny, mask the permissions off and delete the allow
 758  if the permissions become zero, delete the deny if the permissions are non zero.
 759 ****************************************************************************/
 760
 761 static void merge_aces( canon_ace **pp_list_head )
 762 {
 763         canon_ace *list_head = *pp_list_head;
 764         canon_ace *curr_ace_outer;
 765         canon_ace *curr_ace_outer_next;
 766
 767         /*
 768          * First, merge allow entries with identical SIDs, and deny entries
 769          * with identical SIDs.
 770          */
 771
 772         for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 773                 canon_ace *curr_ace;
 774                 canon_ace *curr_ace_next;
 775
 776                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 777
 778                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 779
 780                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 781
 782                         if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
 783                                 (curr_ace->attr == curr_ace_outer->attr)) {
 784
 785                                 if( DEBUGLVL( 10 )) {
 786                                         dbgtext("merge_aces: Merging ACE's\n");
 787                                         print_canon_ace( curr_ace_outer, 0);
 788                                         print_canon_ace( curr_ace, 0);
 789                                 }
 790
 791                                 /* Merge two allow or two deny ACE's. */
 792
 793                                 curr_ace_outer->perms |= curr_ace->perms;
 794                                 DLIST_REMOVE(list_head, curr_ace);
 795                                 SAFE_FREE(curr_ace);
 796                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 797                         }
 798                 }
 799         }
 800
 801         /*
 802          * Now go through and mask off allow permissions with deny permissions.
 803          * We can delete either the allow or deny here as we know that each SID
 804          * appears only once in the list.
 805          */
 806
 807         for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 808                 canon_ace *curr_ace;
 809                 canon_ace *curr_ace_next;
 810
 811                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 812
 813                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 814
 815                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 816
 817                         /*
 818                          * Subtract ACE's with different entries. Due to the ordering constraints
 819                          * we've put on the ACL, we know the deny must be the first one.
 820                          */
 821
 822                         if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
 823                                 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
 824
 825                                 if( DEBUGLVL( 10 )) {
 826                                         dbgtext("merge_aces: Masking ACE's\n");
 827                                         print_canon_ace( curr_ace_outer, 0);
 828                                         print_canon_ace( curr_ace, 0);
 829                                 }
 830
 831                                 curr_ace->perms &= ~curr_ace_outer->perms;
 832
 833                                 if (curr_ace->perms == 0) {
 834
 835                                         /*
 836                                          * The deny overrides the allow. Remove the allow.
 837                                          */
 838
 839                                         DLIST_REMOVE(list_head, curr_ace);
 840                                         SAFE_FREE(curr_ace);
 841                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 842
 843                                 } else {
 844
 845                                         /*
 846                                          * Even after removing permissions, there
 847                                          * are still allow permissions - delete the deny.
 848                                          * It is safe to delete the deny here,
 849                                          * as we are guarenteed by the deny first
 850                                          * ordering that all the deny entries for
 851                                          * this SID have already been merged into one
 852                                          * before we can get to an allow ace.
 853                                          */
 854
 855                                         DLIST_REMOVE(list_head, curr_ace_outer);
 856                                         SAFE_FREE(curr_ace_outer);
 857                                         break;
 858                                 }
 859                         }
 860
 861                 } /* end for curr_ace */
 862         } /* end for curr_ace_outer */
 863
 864         /* We may have modified the list. */
 865
 866         *pp_list_head = list_head;
 867 }
 868
 869 /****************************************************************************
 870  Check if we need to return NT4.x compatible ACL entries.
 871 ****************************************************************************/
 872
 873 static bool nt4_compatible_acls(void)
 874 {
 875         int compat = lp_acl_compatibility();
 876
 877         if (compat == ACL_COMPAT_AUTO) {
 878                 enum remote_arch_types ra_type = get_remote_arch();
 879
 880                 /* Automatically adapt to client */
 881                 return (ra_type <= RA_WINNT);
 882         } else
 883                 return (compat == ACL_COMPAT_WINNT);
 884 }
 885
 886
 887 /****************************************************************************
 888  Map canon_ace perms to permission bits NT.
 889  The attr element is not used here - we only process deny entries on set,
 890  not get. Deny entries are implicit on get with ace->perms = 0.
 891 ****************************************************************************/
 892
 893 static SEC_ACCESS map_canon_ace_perms(int snum,
 894                                 enum security_ace_type *pacl_type,
 895                                 mode_t perms,
 896                                 bool directory_ace)
 897 {
 898         SEC_ACCESS sa;
 899         uint32 nt_mask = 0;
 900
 901         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
 902
 903         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
 904                 if (directory_ace) {
 905                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
 906                 } else {
 907                         nt_mask = UNIX_ACCESS_RWX;
 908                 }
 909         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
 910                 /*
 911                  * Windows NT refuses to display ACEs with no permissions in them (but
 912                  * they are perfectly legal with Windows 2000). If the ACE has empty
 913                  * permissions we cannot use 0, so we use the otherwise unused
 914                  * WRITE_OWNER permission, which we ignore when we set an ACL.
 915                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
 916                  * to be changed in the future.
 917                  */
 918
 919                 if (nt4_compatible_acls())
 920                         nt_mask = UNIX_ACCESS_NONE;
 921                 else
 922                         nt_mask = 0;
 923         } else {
 924                 if (directory_ace) {
 925                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
 926                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
 927                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
 928                 } else {
 929                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
 930                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
 931                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
 932                 }
 933         }
 934
 935         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
 936                         (unsigned int)perms, (unsigned int)nt_mask ));
 937
 938         init_sec_access(&sa,nt_mask);
 939         return sa;
 940 }
 941
 942 /****************************************************************************
 943  Map NT perms to a UNIX mode_t.
 944 ****************************************************************************/
 945
 946 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
 947 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
 948 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
 949
 950 static mode_t map_nt_perms( uint32 *mask, int type)
 951 {
 952         mode_t mode = 0;
 953
 954         switch(type) {
 955         case S_IRUSR:
 956                 if((*mask) & GENERIC_ALL_ACCESS)
 957                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
 958                 else {
 959                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
 960                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
 961                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
 962                 }
 963                 break;
 964         case S_IRGRP:
 965                 if((*mask) & GENERIC_ALL_ACCESS)
 966                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
 967                 else {
 968                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
 969                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
 970                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
 971                 }
 972                 break;
 973         case S_IROTH:
 974                 if((*mask) & GENERIC_ALL_ACCESS)
 975                         mode = S_IROTH|S_IWOTH|S_IXOTH;
 976                 else {
 977                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
 978                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
 979                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
 980                 }
 981                 break;
 982         }
 983
 984         return mode;
 985 }
 986
 987 /****************************************************************************
 988  Unpack a SEC_DESC into a UNIX owner and group.
 989 ****************************************************************************/
 990
 991 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, SEC_DESC *psd)
 992 {
 993         DOM_SID owner_sid;
 994         DOM_SID grp_sid;
 995
 996         *puser = (uid_t)-1;
 997         *pgrp = (gid_t)-1;
 998
 999         if(security_info_sent == 0) {
1000                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1001                 return NT_STATUS_OK;
1002         }
1003
1004         /*
1005          * Validate the owner and group SID's.
1006          */
1007
1008         memset(&owner_sid, '\0', sizeof(owner_sid));
1009         memset(&grp_sid, '\0', sizeof(grp_sid));
1010
1011         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1012
1013         /*
1014          * Don't immediately fail if the owner sid cannot be validated.
1015          * This may be a group chown only set.
1016          */
1017
1018         if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1019                 sid_copy(&owner_sid, psd->owner_sid);
1020                 if (!sid_to_uid(&owner_sid, puser)) {
1021                         if (lp_force_unknown_acl_user(snum)) {
1022                                 /* this allows take ownership to work
1023                                  * reasonably */
1024                                 *puser = current_user.ut.uid;
1025                         } else {
1026                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1027                                          " owner sid for %s\n",
1028                                          sid_string_dbg(&owner_sid)));
1029                                 return NT_STATUS_INVALID_OWNER;
1030                         }
1031                 }
1032                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1033                          (unsigned int)*puser ));
1034         }
1035
1036         /*
1037          * Don't immediately fail if the group sid cannot be validated.
1038          * This may be an owner chown only set.
1039          */
1040
1041         if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1042                 sid_copy(&grp_sid, psd->group_sid);
1043                 if (!sid_to_gid( &grp_sid, pgrp)) {
1044                         if (lp_force_unknown_acl_user(snum)) {
1045                                 /* this allows take group ownership to work
1046                                  * reasonably */
1047                                 *pgrp = current_user.ut.gid;
1048                         } else {
1049                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1050                                          " group sid.\n"));
1051                                 return NT_STATUS_INVALID_OWNER;
1052                         }
1053                 }
1054                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1055                          (unsigned int)*pgrp));
1056         }
1057
1058         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1059
1060         return NT_STATUS_OK;
1061 }
1062
1063 /****************************************************************************
1064  Ensure the enforced permissions for this share apply.
1065 ****************************************************************************/
1066
1067 static void apply_default_perms(const struct share_params *params,
1068                                 const bool is_directory, canon_ace *pace,
1069                                 mode_t type)
1070 {
1071         mode_t and_bits = (mode_t)0;
1072         mode_t or_bits = (mode_t)0;
1073
1074         /* Get the initial bits to apply. */
1075
1076         if (is_directory) {
1077                 and_bits = lp_dir_security_mask(params->service);
1078                 or_bits = lp_force_dir_security_mode(params->service);
1079         } else {
1080                 and_bits = lp_security_mask(params->service);
1081                 or_bits = lp_force_security_mode(params->service);
1082         }
1083
1084         /* Now bounce them into the S_USR space. */
1085         switch(type) {
1086         case S_IRUSR:
1087                 /* Ensure owner has read access. */
1088                 pace->perms |= S_IRUSR;
1089                 if (is_directory)
1090                         pace->perms |= (S_IWUSR|S_IXUSR);
1091                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1092                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1093                 break;
1094         case S_IRGRP:
1095                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1096                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1097                 break;
1098         case S_IROTH:
1099                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1100                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1101                 break;
1102         }
1103
1104         pace->perms = ((pace->perms & and_bits)|or_bits);
1105 }
1106
1107 /****************************************************************************
1108  Check if a given uid/SID is in a group gid/SID. This is probably very
1109  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1110 ****************************************************************************/
1111
1112 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1113 {
1114         const char *u_name = NULL;
1115
1116         /* "Everyone" always matches every uid. */
1117
1118         if (sid_equal(&group_ace->trustee, &global_sid_World))
1119                 return True;
1120
1121         /* Assume that the current user is in the current group (force group) */
1122
1123         if (uid_ace->unix_ug.uid == current_user.ut.uid && group_ace->unix_ug.gid == current_user.ut.gid)
1124                 return True;
1125
1126         /* u_name talloc'ed off tos. */
1127         u_name = uidtoname(uid_ace->unix_ug.uid);
1128         if (!u_name) {
1129                 return False;
1130         }
1131         return user_in_group_sid(u_name, &group_ace->trustee);
1132 }
1133
1134 /****************************************************************************
1135  A well formed POSIX file or default ACL has at least 3 entries, a
1136  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1137  In addition, the owner must always have at least read access.
1138  When using this call on get_acl, the pst struct is valid and contains
1139  the mode of the file. When using this call on set_acl, the pst struct has
1140  been modified to have a mode containing the default for this file or directory
1141  type.
1142 ****************************************************************************/
1143
1144 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1145                                      const struct share_params *params,
1146                                      const bool is_directory,
1147                                                         const DOM_SID *pfile_owner_sid,
1148                                                         const DOM_SID *pfile_grp_sid,
1149                                                         const SMB_STRUCT_STAT *pst,
1150                                                         bool setting_acl)
1151 {
1152         canon_ace *pace;
1153         bool got_user = False;
1154         bool got_grp = False;
1155         bool got_other = False;
1156         canon_ace *pace_other = NULL;
1157
1158         for (pace = *pp_ace; pace; pace = pace->next) {
1159                 if (pace->type == SMB_ACL_USER_OBJ) {
1160
1161                         if (setting_acl)
1162                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1163                         got_user = True;
1164
1165                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1166
1167                         /*
1168                          * Ensure create mask/force create mode is respected on set.
1169                          */
1170
1171                         if (setting_acl)
1172                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1173                         got_grp = True;
1174
1175                 } else if (pace->type == SMB_ACL_OTHER) {
1176
1177                         /*
1178                          * Ensure create mask/force create mode is respected on set.
1179                          */
1180
1181                         if (setting_acl)
1182                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1183                         got_other = True;
1184                         pace_other = pace;
1185                 }
1186         }
1187
1188         if (!got_user) {
1189                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1190                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1191                         return False;
1192                 }
1193
1194                 ZERO_STRUCTP(pace);
1195                 pace->type = SMB_ACL_USER_OBJ;
1196                 pace->owner_type = UID_ACE;
1197                 pace->unix_ug.uid = pst->st_uid;
1198                 pace->trustee = *pfile_owner_sid;
1199                 pace->attr = ALLOW_ACE;
1200
1201                 if (setting_acl) {
1202                         /* See if the owning user is in any of the other groups in
1203                            the ACE. If so, OR in the permissions from that group. */
1204
1205                         bool group_matched = False;
1206                         canon_ace *pace_iter;
1207
1208                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1209                                 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1210                                         if (uid_entry_in_group(pace, pace_iter)) {
1211                                                 pace->perms |= pace_iter->perms;
1212                                                 group_matched = True;
1213                                         }
1214                                 }
1215                         }
1216
1217                         /* If we only got an "everyone" perm, just use that. */
1218                         if (!group_matched) {
1219                                 if (got_other)
1220                                         pace->perms = pace_other->perms;
1221                                 else
1222                                         pace->perms = 0;
1223                         }
1224
1225                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1226                 } else {
1227                         pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1228                 }
1229
1230                 DLIST_ADD(*pp_ace, pace);
1231         }
1232
1233         if (!got_grp) {
1234                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1235                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1236                         return False;
1237                 }
1238
1239                 ZERO_STRUCTP(pace);
1240                 pace->type = SMB_ACL_GROUP_OBJ;
1241                 pace->owner_type = GID_ACE;
1242                 pace->unix_ug.uid = pst->st_gid;
1243                 pace->trustee = *pfile_grp_sid;
1244                 pace->attr = ALLOW_ACE;
1245                 if (setting_acl) {
1246                         /* If we only got an "everyone" perm, just use that. */
1247                         if (got_other)
1248                                 pace->perms = pace_other->perms;
1249                         else
1250                                 pace->perms = 0;
1251                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1252                 } else {
1253                         pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1254                 }
1255
1256                 DLIST_ADD(*pp_ace, pace);
1257         }
1258
1259         if (!got_other) {
1260                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1261                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1262                         return False;
1263                 }
1264
1265                 ZERO_STRUCTP(pace);
1266                 pace->type = SMB_ACL_OTHER;
1267                 pace->owner_type = WORLD_ACE;
1268                 pace->unix_ug.world = -1;
1269                 pace->trustee = global_sid_World;
1270                 pace->attr = ALLOW_ACE;
1271                 if (setting_acl) {
1272                         pace->perms = 0;
1273                         apply_default_perms(params, is_directory, pace, S_IROTH);
1274                 } else
1275                         pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
1276
1277                 DLIST_ADD(*pp_ace, pace);
1278         }
1279
1280         return True;
1281 }
1282
1283 /****************************************************************************
1284  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1285  If it does not have them, check if there are any entries where the trustee is the
1286  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1287 ****************************************************************************/
1288
1289 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1290 {
1291         bool got_user_obj, got_group_obj;
1292         canon_ace *current_ace;
1293         int i, entries;
1294
1295         entries = count_canon_ace_list(ace);
1296         got_user_obj = False;
1297         got_group_obj = False;
1298
1299         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1300                 if (current_ace->type == SMB_ACL_USER_OBJ)
1301                         got_user_obj = True;
1302                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1303                         got_group_obj = True;
1304         }
1305         if (got_user_obj && got_group_obj) {
1306                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1307                 return;
1308         }
1309
1310         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1311                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1312                                 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1313                         current_ace->type = SMB_ACL_USER_OBJ;
1314                         got_user_obj = True;
1315                 }
1316                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1317                                 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1318                         current_ace->type = SMB_ACL_GROUP_OBJ;
1319                         got_group_obj = True;
1320                 }
1321         }
1322         if (!got_user_obj)
1323                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1324         if (!got_group_obj)
1325                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1326 }
1327
1328 /****************************************************************************
1329  Unpack a SEC_DESC into two canonical ace lists.
1330 ****************************************************************************/
1331
1332 static bool create_canon_ace_lists(files_struct *fsp, SMB_STRUCT_STAT *pst,
1333                                                         DOM_SID *pfile_owner_sid,
1334                                                         DOM_SID *pfile_grp_sid,
1335                                                         canon_ace **ppfile_ace, canon_ace **ppdir_ace,
1336                                                         SEC_ACL *dacl)
1337 {
1338         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1339         canon_ace *file_ace = NULL;
1340         canon_ace *dir_ace = NULL;
1341         canon_ace *current_ace = NULL;
1342         bool got_dir_allow = False;
1343         bool got_file_allow = False;
1344         int i, j;
1345
1346         *ppfile_ace = NULL;
1347         *ppdir_ace = NULL;
1348
1349         /*
1350          * Convert the incoming ACL into a more regular form.
1351          */
1352
1353         for(i = 0; i < dacl->num_aces; i++) {
1354                 SEC_ACE *psa = &dacl->aces[i];
1355
1356                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1357                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1358                         return False;
1359                 }
1360
1361                 if (nt4_compatible_acls()) {
1362                         /*
1363                          * The security mask may be UNIX_ACCESS_NONE which should map into
1364                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1365                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1366                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1367                          */
1368
1369                         /*
1370                          * Convert GENERIC bits to specific bits.
1371                          */
1372
1373                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1374
1375                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1376
1377                         if(psa->access_mask != UNIX_ACCESS_NONE)
1378                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1379                 }
1380         }
1381
1382         /*
1383          * Deal with the fact that NT 4.x re-writes the canonical format
1384          * that we return for default ACLs. If a directory ACE is identical
1385          * to a inherited directory ACE then NT changes the bits so that the
1386          * first ACE is set to OI|IO and the second ACE for this SID is set
1387          * to CI. We need to repair this. JRA.
1388          */
1389
1390         for(i = 0; i < dacl->num_aces; i++) {
1391                 SEC_ACE *psa1 = &dacl->aces[i];
1392
1393                 for (j = i + 1; j < dacl->num_aces; j++) {
1394                         SEC_ACE *psa2 = &dacl->aces[j];
1395
1396                         if (psa1->access_mask != psa2->access_mask)
1397                                 continue;
1398
1399                         if (!sid_equal(&psa1->trustee, &psa2->trustee))
1400                                 continue;
1401
1402                         /*
1403                          * Ok - permission bits and SIDs are equal.
1404                          * Check if flags were re-written.
1405                          */
1406
1407                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1408
1409                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1410                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1411
1412                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1413
1414                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1415                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1416
1417                         }
1418                 }
1419         }
1420
1421         for(i = 0; i < dacl->num_aces; i++) {
1422                 SEC_ACE *psa = &dacl->aces[i];
1423
1424                 /*
1425                  * Create a cannon_ace entry representing this NT DACL ACE.
1426                  */
1427
1428                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1429                         free_canon_ace_list(file_ace);
1430                         free_canon_ace_list(dir_ace);
1431                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1432                         return False;
1433                 }
1434
1435                 ZERO_STRUCTP(current_ace);
1436
1437                 sid_copy(&current_ace->trustee, &psa->trustee);
1438
1439                 /*
1440                  * Try and work out if the SID is a user or group
1441                  * as we need to flag these differently for POSIX.
1442                  * Note what kind of a POSIX ACL this should map to.
1443                  */
1444
1445                 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1446                         current_ace->owner_type = WORLD_ACE;
1447                         current_ace->unix_ug.world = -1;
1448                         current_ace->type = SMB_ACL_OTHER;
1449                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1450                         current_ace->owner_type = UID_ACE;
1451                         current_ace->unix_ug.uid = pst->st_uid;
1452                         current_ace->type = SMB_ACL_USER_OBJ;
1453
1454                         /*
1455                          * The Creator Owner entry only specifies inheritable permissions,
1456                          * never access permissions. WinNT doesn't always set the ACE to
1457                          *INHERIT_ONLY, though.
1458                          */
1459
1460                         if (nt4_compatible_acls())
1461                                 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1462                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1463                         current_ace->owner_type = GID_ACE;
1464                         current_ace->unix_ug.gid = pst->st_gid;
1465                         current_ace->type = SMB_ACL_GROUP_OBJ;
1466
1467                         /*
1468                          * The Creator Group entry only specifies inheritable permissions,
1469                          * never access permissions. WinNT doesn't always set the ACE to
1470                          *INHERIT_ONLY, though.
1471                          */
1472                         if (nt4_compatible_acls())
1473                                 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1474
1475                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1476                         current_ace->owner_type = UID_ACE;
1477                         /* If it's the owning user, this is a user_obj, not
1478                          * a user. */
1479                         if (current_ace->unix_ug.uid == pst->st_uid) {
1480                                 current_ace->type = SMB_ACL_USER_OBJ;
1481                         } else {
1482                                 current_ace->type = SMB_ACL_USER;
1483                         }
1484                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1485                         current_ace->owner_type = GID_ACE;
1486                         /* If it's the primary group, this is a group_obj, not
1487                          * a group. */
1488                         if (current_ace->unix_ug.gid == pst->st_gid) {
1489                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1490                         } else {
1491                                 current_ace->type = SMB_ACL_GROUP;
1492                         }
1493                 } else {
1494                         /*
1495                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1496                          */
1497
1498                         if (non_mappable_sid(&psa->trustee)) {
1499                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1500                                            "non-mappable SID %s\n",
1501                                            sid_string_dbg(&psa->trustee)));
1502                                 SAFE_FREE(current_ace);
1503                                 continue;
1504                         }
1505
1506                         free_canon_ace_list(file_ace);
1507                         free_canon_ace_list(dir_ace);
1508                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1509                                   "%s to uid or gid.\n",
1510                                   sid_string_dbg(&current_ace->trustee)));
1511                         SAFE_FREE(current_ace);
1512                         return False;
1513                 }
1514
1515                 /*
1516                  * Map the given NT permissions into a UNIX mode_t containing only
1517                  * S_I(R|W|X)USR bits.
1518                  */
1519
1520                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1521                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1522                 current_ace->inherited = ((psa->flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False);
1523
1524                 /*
1525                  * Now add the created ace to either the file list, the directory
1526                  * list, or both. We *MUST* preserve the order here (hence we use
1527                  * DLIST_ADD_END) as NT ACLs are order dependent.
1528                  */
1529
1530                 if (fsp->is_directory) {
1531
1532                         /*
1533                          * We can only add to the default POSIX ACE list if the ACE is
1534                          * designed to be inherited by both files and directories.
1535                          */
1536
1537                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1538                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1539
1540                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1541
1542                                 /*
1543                                  * Note if this was an allow ace. We can't process
1544                                  * any further deny ace's after this.
1545                                  */
1546
1547                                 if (current_ace->attr == ALLOW_ACE)
1548                                         got_dir_allow = True;
1549
1550                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1551                                         DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1552 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1553                                         free_canon_ace_list(file_ace);
1554                                         free_canon_ace_list(dir_ace);
1555                                         return False;
1556                                 }
1557
1558                                 if( DEBUGLVL( 10 )) {
1559                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1560                                         print_canon_ace( current_ace, 0);
1561                                 }
1562
1563                                 /*
1564                                  * If this is not an inherit only ACE we need to add a duplicate
1565                                  * to the file acl.
1566                                  */
1567
1568                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1569                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1570
1571                                         if (!dup_ace) {
1572                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1573                                                 free_canon_ace_list(file_ace);
1574                                                 free_canon_ace_list(dir_ace);
1575                                                 return False;
1576                                         }
1577
1578                                         /*
1579                                          * We must not free current_ace here as its
1580                                          * pointer is now owned by the dir_ace list.
1581                                          */
1582                                         current_ace = dup_ace;
1583                                 } else {
1584                                         /*
1585                                          * We must not free current_ace here as its
1586                                          * pointer is now owned by the dir_ace list.
1587                                          */
1588                                         current_ace = NULL;
1589                                 }
1590                         }
1591                 }
1592
1593                 /*
1594                  * Only add to the file ACL if not inherit only.
1595                  */
1596
1597                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1598                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1599
1600                         /*
1601                          * Note if this was an allow ace. We can't process
1602                          * any further deny ace's after this.
1603                          */
1604
1605                         if (current_ace->attr == ALLOW_ACE)
1606                                 got_file_allow = True;
1607
1608                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1609                                 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1610 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1611                                 free_canon_ace_list(file_ace);
1612                                 free_canon_ace_list(dir_ace);
1613                                 return False;
1614                         }
1615
1616                         if( DEBUGLVL( 10 )) {
1617                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1618                                 print_canon_ace( current_ace, 0);
1619                         }
1620                         all_aces_are_inherit_only = False;
1621                         /*
1622                          * We must not free current_ace here as its
1623                          * pointer is now owned by the file_ace list.
1624                          */
1625                         current_ace = NULL;
1626                 }
1627
1628                 /*
1629                  * Free if ACE was not added.
1630                  */
1631
1632                 SAFE_FREE(current_ace);
1633         }
1634
1635         if (fsp->is_directory && all_aces_are_inherit_only) {
1636                 /*
1637                  * Windows 2000 is doing one of these weird 'inherit acl'
1638                  * traverses to conserve NTFS ACL resources. Just pretend
1639                  * there was no DACL sent. JRA.
1640                  */
1641
1642                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1643                 free_canon_ace_list(file_ace);
1644                 free_canon_ace_list(dir_ace);
1645                 file_ace = NULL;
1646                 dir_ace = NULL;
1647         } else {
1648                 /*
1649                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1650                  * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1651                  * entries can be converted to *_OBJ. Usually we will already have these
1652                  * entries in the Default ACL, and the Access ACL will not have them.
1653                  */
1654                 if (file_ace) {
1655                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1656                 }
1657                 if (dir_ace) {
1658                         check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1659                 }
1660         }
1661
1662         *ppfile_ace = file_ace;
1663         *ppdir_ace = dir_ace;
1664
1665         return True;
1666 }
1667
1668 /****************************************************************************
1669  ASCII art time again... JRA :-).
1670
1671  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1672  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1673  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1674  allow or deny have been merged, so the same SID can only appear once in the deny
1675  list or once in the allow list.
1676
1677  We then process as follows :
1678
1679  ---------------------------------------------------------------------------
1680  First pass - look for a Everyone DENY entry.
1681
1682  If it is deny all (rwx) trunate the list at this point.
1683  Else, walk the list from this point and use the deny permissions of this
1684  entry as a mask on all following allow entries. Finally, delete
1685  the Everyone DENY entry (we have applied it to everything possible).
1686
1687  In addition, in this pass we remove any DENY entries that have
1688  no permissions (ie. they are a DENY nothing).
1689  ---------------------------------------------------------------------------
1690  Second pass - only deal with deny user entries.
1691
1692  DENY user1 (perms XXX)
1693
1694  new_perms = 0
1695  for all following allow group entries where user1 is in group
1696         new_perms |= group_perms;
1697
1698  user1 entry perms = new_perms & ~ XXX;
1699
1700  Convert the deny entry to an allow entry with the new perms and
1701  push to the end of the list. Note if the user was in no groups
1702  this maps to a specific allow nothing entry for this user.
1703
1704  The common case from the NT ACL choser (userX deny all) is
1705  optimised so we don't do the group lookup - we just map to
1706  an allow nothing entry.
1707
1708  What we're doing here is inferring the allow permissions the
1709  person setting the ACE on user1 wanted by looking at the allow
1710  permissions on the groups the user is currently in. This will
1711  be a snapshot, depending on group membership but is the best
1712  we can do and has the advantage of failing closed rather than
1713  open.
1714  ---------------------------------------------------------------------------
1715  Third pass - only deal with deny group entries.
1716
1717  DENY group1 (perms XXX)
1718
1719  for all following allow user entries where user is in group1
1720    user entry perms = user entry perms & ~ XXX;
1721
1722  If there is a group Everyone allow entry with permissions YYY,
1723  convert the group1 entry to an allow entry and modify its
1724  permissions to be :
1725
1726  new_perms = YYY & ~ XXX
1727
1728  and push to the end of the list.
1729
1730  If there is no group Everyone allow entry then convert the
1731  group1 entry to a allow nothing entry and push to the end of the list.
1732
1733  Note that the common case from the NT ACL choser (groupX deny all)
1734  cannot be optimised here as we need to modify user entries who are
1735  in the group to change them to a deny all also.
1736
1737  What we're doing here is modifying the allow permissions of
1738  user entries (which are more specific in POSIX ACLs) to mask
1739  out the explicit deny set on the group they are in. This will
1740  be a snapshot depending on current group membership but is the
1741  best we can do and has the advantage of failing closed rather
1742  than open.
1743  ---------------------------------------------------------------------------
1744  Fourth pass - cope with cumulative permissions.
1745
1746  for all allow user entries, if there exists an allow group entry with
1747  more permissive permissions, and the user is in that group, rewrite the
1748  allow user permissions to contain both sets of permissions.
1749
1750  Currently the code for this is #ifdef'ed out as these semantics make
1751  no sense to me. JRA.
1752  ---------------------------------------------------------------------------
1753
1754  Note we *MUST* do the deny user pass first as this will convert deny user
1755  entries into allow user entries which can then be processed by the deny
1756  group pass.
1757
1758  The above algorithm took a *lot* of thinking about - hence this
1759  explaination :-). JRA.
1760 ****************************************************************************/
1761
1762 /****************************************************************************
1763  Process a canon_ace list entries. This is very complex code. We need
1764  to go through and remove the "deny" permissions from any allow entry that matches
1765  the id of this entry. We have already refused any NT ACL that wasn't in correct
1766  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1767  we just remove it (to fail safe). We have already removed any duplicate ace
1768  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1769  allow entries.
1770 ****************************************************************************/
1771
1772 static void process_deny_list( canon_ace **pp_ace_list )
1773 {
1774         canon_ace *ace_list = *pp_ace_list;
1775         canon_ace *curr_ace = NULL;
1776         canon_ace *curr_ace_next = NULL;
1777
1778         /* Pass 1 above - look for an Everyone, deny entry. */
1779
1780         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1781                 canon_ace *allow_ace_p;
1782
1783                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1784
1785                 if (curr_ace->attr != DENY_ACE)
1786                         continue;
1787
1788                 if (curr_ace->perms == (mode_t)0) {
1789
1790                         /* Deny nothing entry - delete. */
1791
1792                         DLIST_REMOVE(ace_list, curr_ace);
1793                         continue;
1794                 }
1795
1796                 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1797                         continue;
1798
1799                 /* JRATEST - assert. */
1800                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1801
1802                 if (curr_ace->perms == ALL_ACE_PERMS) {
1803
1804                         /*
1805                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1806                          * list at this point including this entry.
1807                          */
1808
1809                         canon_ace *prev_entry = curr_ace->prev;
1810
1811                         free_canon_ace_list( curr_ace );
1812                         if (prev_entry)
1813                                 prev_entry->next = NULL;
1814                         else {
1815                                 /* We deleted the entire list. */
1816                                 ace_list = NULL;
1817                         }
1818                         break;
1819                 }
1820
1821                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1822
1823                         /*
1824                          * Only mask off allow entries.
1825                          */
1826
1827                         if (allow_ace_p->attr != ALLOW_ACE)
1828                                 continue;
1829
1830                         allow_ace_p->perms &= ~curr_ace->perms;
1831                 }
1832
1833                 /*
1834                  * Now it's been applied, remove it.
1835                  */
1836
1837                 DLIST_REMOVE(ace_list, curr_ace);
1838         }
1839
1840         /* Pass 2 above - deal with deny user entries. */
1841
1842         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1843                 mode_t new_perms = (mode_t)0;
1844                 canon_ace *allow_ace_p;
1845
1846                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1847
1848                 if (curr_ace->attr != DENY_ACE)
1849                         continue;
1850
1851                 if (curr_ace->owner_type != UID_ACE)
1852                         continue;
1853
1854                 if (curr_ace->perms == ALL_ACE_PERMS) {
1855
1856                         /*
1857                          * Optimisation - this is a deny everything to this user.
1858                          * Convert to an allow nothing and push to the end of the list.
1859                          */
1860
1861                         curr_ace->attr = ALLOW_ACE;
1862                         curr_ace->perms = (mode_t)0;
1863                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1864                         continue;
1865                 }
1866
1867                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1868
1869                         if (allow_ace_p->attr != ALLOW_ACE)
1870                                 continue;
1871
1872                         /* We process GID_ACE and WORLD_ACE entries only. */
1873
1874                         if (allow_ace_p->owner_type == UID_ACE)
1875                                 continue;
1876
1877                         if (uid_entry_in_group( curr_ace, allow_ace_p))
1878                                 new_perms |= allow_ace_p->perms;
1879                 }
1880
1881                 /*
1882                  * Convert to a allow entry, modify the perms and push to the end
1883                  * of the list.
1884                  */
1885
1886                 curr_ace->attr = ALLOW_ACE;
1887                 curr_ace->perms = (new_perms & ~curr_ace->perms);
1888                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1889         }
1890
1891         /* Pass 3 above - deal with deny group entries. */
1892
1893         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1894                 canon_ace *allow_ace_p;
1895                 canon_ace *allow_everyone_p = NULL;
1896
1897                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1898
1899                 if (curr_ace->attr != DENY_ACE)
1900                         continue;
1901
1902                 if (curr_ace->owner_type != GID_ACE)
1903                         continue;
1904
1905                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1906
1907                         if (allow_ace_p->attr != ALLOW_ACE)
1908                                 continue;
1909
1910                         /* Store a pointer to the Everyone allow, if it exists. */
1911                         if (allow_ace_p->owner_type == WORLD_ACE)
1912                                 allow_everyone_p = allow_ace_p;
1913
1914                         /* We process UID_ACE entries only. */
1915
1916                         if (allow_ace_p->owner_type != UID_ACE)
1917                                 continue;
1918
1919                         /* Mask off the deny group perms. */
1920
1921                         if (uid_entry_in_group( allow_ace_p, curr_ace))
1922                                 allow_ace_p->perms &= ~curr_ace->perms;
1923                 }
1924
1925                 /*
1926                  * Convert the deny to an allow with the correct perms and
1927                  * push to the end of the list.
1928                  */
1929
1930                 curr_ace->attr = ALLOW_ACE;
1931                 if (allow_everyone_p)
1932                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
1933                 else
1934                         curr_ace->perms = (mode_t)0;
1935                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1936         }
1937
1938         /* Doing this fourth pass allows Windows semantics to be layered
1939          * on top of POSIX semantics. I'm not sure if this is desirable.
1940          * For example, in W2K ACLs there is no way to say, "Group X no
1941          * access, user Y full access" if user Y is a member of group X.
1942          * This seems completely broken semantics to me.... JRA.
1943          */
1944
1945 #if 0
1946         /* Pass 4 above - deal with allow entries. */
1947
1948         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1949                 canon_ace *allow_ace_p;
1950
1951                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1952
1953                 if (curr_ace->attr != ALLOW_ACE)
1954                         continue;
1955
1956                 if (curr_ace->owner_type != UID_ACE)
1957                         continue;
1958
1959                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1960
1961                         if (allow_ace_p->attr != ALLOW_ACE)
1962                                 continue;
1963
1964                         /* We process GID_ACE entries only. */
1965
1966                         if (allow_ace_p->owner_type != GID_ACE)
1967                                 continue;
1968
1969                         /* OR in the group perms. */
1970
1971                         if (uid_entry_in_group( curr_ace, allow_ace_p))
1972                                 curr_ace->perms |= allow_ace_p->perms;
1973                 }
1974         }
1975 #endif
1976
1977         *pp_ace_list = ace_list;
1978 }
1979
1980 /****************************************************************************
1981  Create a default mode that will be used if a security descriptor entry has
1982  no user/group/world entries.
1983 ****************************************************************************/
1984
1985 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
1986 {
1987         int snum = SNUM(fsp->conn);
1988         mode_t and_bits = (mode_t)0;
1989         mode_t or_bits = (mode_t)0;
1990         mode_t mode = interitable_mode
1991                 ? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name,
1992                              NULL )
1993                 : S_IRUSR;
1994
1995         if (fsp->is_directory)
1996                 mode |= (S_IWUSR|S_IXUSR);
1997
1998         /*
1999          * Now AND with the create mode/directory mode bits then OR with the
2000          * force create mode/force directory mode bits.
2001          */
2002
2003         if (fsp->is_directory) {
2004                 and_bits = lp_dir_security_mask(snum);
2005                 or_bits = lp_force_dir_security_mode(snum);
2006         } else {
2007                 and_bits = lp_security_mask(snum);
2008                 or_bits = lp_force_security_mode(snum);
2009         }
2010
2011         return ((mode & and_bits)|or_bits);
2012 }
2013
2014 /****************************************************************************
2015  Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2016  succeeding.
2017 ****************************************************************************/
2018
2019 static bool unpack_canon_ace(files_struct *fsp,
2020                                                         SMB_STRUCT_STAT *pst,
2021                                                         DOM_SID *pfile_owner_sid,
2022                                                         DOM_SID *pfile_grp_sid,
2023                                                         canon_ace **ppfile_ace, canon_ace **ppdir_ace,
2024                                                         uint32 security_info_sent, SEC_DESC *psd)
2025 {
2026         canon_ace *file_ace = NULL;
2027         canon_ace *dir_ace = NULL;
2028
2029         *ppfile_ace = NULL;
2030         *ppdir_ace = NULL;
2031
2032         if(security_info_sent == 0) {
2033                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2034                 return False;
2035         }
2036
2037         /*
2038          * If no DACL then this is a chown only security descriptor.
2039          */
2040
2041         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2042                 return True;
2043
2044         /*
2045          * Now go through the DACL and create the canon_ace lists.
2046          */
2047
2048         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2049                                                                 &file_ace, &dir_ace, psd->dacl))
2050                 return False;
2051
2052         if ((file_ace == NULL) && (dir_ace == NULL)) {
2053                 /* W2K traverse DACL set - ignore. */
2054                 return True;
2055         }
2056
2057         /*
2058          * Go through the canon_ace list and merge entries
2059          * belonging to identical users of identical allow or deny type.
2060          * We can do this as all deny entries come first, followed by
2061          * all allow entries (we have mandated this before accepting this acl).
2062          */
2063
2064         print_canon_ace_list( "file ace - before merge", file_ace);
2065         merge_aces( &file_ace );
2066
2067         print_canon_ace_list( "dir ace - before merge", dir_ace);
2068         merge_aces( &dir_ace );
2069
2070         /*
2071          * NT ACLs are order dependent. Go through the acl lists and
2072          * process DENY entries by masking the allow entries.
2073          */
2074
2075         print_canon_ace_list( "file ace - before deny", file_ace);
2076         process_deny_list( &file_ace);
2077
2078         print_canon_ace_list( "dir ace - before deny", dir_ace);
2079         process_deny_list( &dir_ace);
2080
2081         /*
2082          * A well formed POSIX file or default ACL has at least 3 entries, a
2083          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2084          * and optionally a mask entry. Ensure this is the case.
2085          */
2086
2087         print_canon_ace_list( "file ace - before valid", file_ace);
2088
2089         /*
2090          * A default 3 element mode entry for a file should be r-- --- ---.
2091          * A default 3 element mode entry for a directory should be rwx --- ---.
2092          */
2093
2094         pst->st_mode = create_default_mode(fsp, False);
2095
2096         if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2097                 free_canon_ace_list(file_ace);
2098                 free_canon_ace_list(dir_ace);
2099                 return False;
2100         }
2101
2102         print_canon_ace_list( "dir ace - before valid", dir_ace);
2103
2104         /*
2105          * A default inheritable 3 element mode entry for a directory should be the
2106          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2107          * it's a directory.
2108          */
2109
2110         pst->st_mode = create_default_mode(fsp, True);
2111
2112         if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2113                 free_canon_ace_list(file_ace);
2114                 free_canon_ace_list(dir_ace);
2115                 return False;
2116         }
2117
2118         print_canon_ace_list( "file ace - return", file_ace);
2119         print_canon_ace_list( "dir ace - return", dir_ace);
2120
2121         *ppfile_ace = file_ace;
2122         *ppdir_ace = dir_ace;
2123         return True;
2124
2125 }
2126
2127 /******************************************************************************
2128  When returning permissions, try and fit NT display
2129  semantics if possible. Note the the canon_entries here must have been malloced.
2130  The list format should be - first entry = owner, followed by group and other user
2131  entries, last entry = other.
2132
2133  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2134  are not ordered, and match on the most specific entry rather than walking a list,
2135  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2136
2137  Entry 0: owner : deny all except read and write.
2138  Entry 1: owner : allow read and write.
2139  Entry 2: group : deny all except read.
2140  Entry 3: group : allow read.
2141  Entry 4: Everyone : allow read.
2142
2143  But NT cannot display this in their ACL editor !
2144 ********************************************************************************/
2145
2146 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2147 {
2148         canon_ace *list_head = *pp_list_head;
2149         canon_ace *owner_ace = NULL;
2150         canon_ace *other_ace = NULL;
2151         canon_ace *ace = NULL;
2152
2153         for (ace = list_head; ace; ace = ace->next) {
2154                 if (ace->type == SMB_ACL_USER_OBJ)
2155                         owner_ace = ace;
2156                 else if (ace->type == SMB_ACL_OTHER) {
2157                         /* Last ace - this is "other" */
2158                         other_ace = ace;
2159                 }
2160         }
2161
2162         if (!owner_ace || !other_ace) {
2163                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2164                         filename ));
2165                 return;
2166         }
2167
2168         /*
2169          * The POSIX algorithm applies to owner first, and other last,
2170          * so ensure they are arranged in this order.
2171          */
2172
2173         if (owner_ace) {
2174                 DLIST_PROMOTE(list_head, owner_ace);
2175         }
2176
2177         if (other_ace) {
2178                 DLIST_DEMOTE(list_head, other_ace, canon_ace *);
2179         }
2180
2181         /* We have probably changed the head of the list. */
2182
2183         *pp_list_head = list_head;
2184 }
2185
2186 /****************************************************************************
2187  Create a linked list of canonical ACE entries.
2188 ****************************************************************************/
2189
2190 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2191                                    const char *fname, SMB_ACL_T posix_acl,
2192                                    const SMB_STRUCT_STAT *psbuf,
2193                                    const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2194 {
2195         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2196         canon_ace *list_head = NULL;
2197         canon_ace *ace = NULL;
2198         canon_ace *next_ace = NULL;
2199         int entry_id = SMB_ACL_FIRST_ENTRY;
2200         SMB_ACL_ENTRY_T entry;
2201         size_t ace_count;
2202
2203         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2204                 SMB_ACL_TAG_T tagtype;
2205                 SMB_ACL_PERMSET_T permset;
2206                 DOM_SID sid;
2207                 posix_id unix_ug;
2208                 enum ace_owner owner_type;
2209
2210                 /* get_next... */
2211                 if (entry_id == SMB_ACL_FIRST_ENTRY)
2212                         entry_id = SMB_ACL_NEXT_ENTRY;
2213
2214                 /* Is this a MASK entry ? */
2215                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2216                         continue;
2217
2218                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2219                         continue;
2220
2221                 /* Decide which SID to use based on the ACL type. */
2222                 switch(tagtype) {
2223                         case SMB_ACL_USER_OBJ:
2224                                 /* Get the SID from the owner. */
2225                                 sid_copy(&sid, powner);
2226                                 unix_ug.uid = psbuf->st_uid;
2227                                 owner_type = UID_ACE;
2228                                 break;
2229                         case SMB_ACL_USER:
2230                                 {
2231                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2232                                         if (puid == NULL) {
2233                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2234                                                 continue;
2235                                         }
2236                                         /*
2237                                          * A SMB_ACL_USER entry for the owner is shadowed by the
2238                                          * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2239                                          * that entry, so we ignore it. We also don't create such
2240                                          * entries out of the blue when setting ACLs, so a get/set
2241                                          * cycle will drop them.
2242                                          */
2243                                         if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_uid) {
2244                                                 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2245                                                 continue;
2246                                         }
2247                                         uid_to_sid( &sid, *puid);
2248                                         unix_ug.uid = *puid;
2249                                         owner_type = UID_ACE;
2250                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2251                                         break;
2252                                 }
2253                         case SMB_ACL_GROUP_OBJ:
2254                                 /* Get the SID from the owning group. */
2255                                 sid_copy(&sid, pgroup);
2256                                 unix_ug.gid = psbuf->st_gid;
2257                                 owner_type = GID_ACE;
2258                                 break;
2259                         case SMB_ACL_GROUP:
2260                                 {
2261                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2262                                         if (pgid == NULL) {
2263                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2264                                                 continue;
2265                                         }
2266                                         gid_to_sid( &sid, *pgid);
2267                                         unix_ug.gid = *pgid;
2268                                         owner_type = GID_ACE;
2269                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2270                                         break;
2271                                 }
2272                         case SMB_ACL_MASK:
2273                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2274                                 continue; /* Don't count the mask as an entry. */
2275                         case SMB_ACL_OTHER:
2276                                 /* Use the Everyone SID */
2277                                 sid = global_sid_World;
2278                                 unix_ug.world = -1;
2279                                 owner_type = WORLD_ACE;
2280                                 break;
2281                         default:
2282                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2283                                 continue;
2284                 }
2285
2286                 /*
2287                  * Add this entry to the list.
2288                  */
2289
2290                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2291                         goto fail;
2292
2293                 ZERO_STRUCTP(ace);
2294                 ace->type = tagtype;
2295                 ace->perms = convert_permset_to_mode_t(conn, permset);
2296                 ace->attr = ALLOW_ACE;
2297                 ace->trustee = sid;
2298                 ace->unix_ug = unix_ug;
2299                 ace->owner_type = owner_type;
2300                 ace->inherited = get_inherited_flag(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2301
2302                 DLIST_ADD(list_head, ace);
2303         }
2304
2305         /*
2306          * This next call will ensure we have at least a user/group/world set.
2307          */
2308
2309         if (!ensure_canon_entry_valid(&list_head, conn->params,
2310                                       S_ISDIR(psbuf->st_mode), powner, pgroup,
2311                                       psbuf, False))
2312                 goto fail;
2313
2314         /*
2315          * Now go through the list, masking the permissions with the
2316          * acl_mask. Ensure all DENY Entries are at the start of the list.
2317          */
2318
2319         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2320
2321         for ( ace_count = 0, ace = list_head; ace; ace = next_ace, ace_count++) {
2322                 next_ace = ace->next;
2323
2324                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2325                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2326                         ace->perms &= acl_mask;
2327
2328                 if (ace->perms == 0) {
2329                         DLIST_PROMOTE(list_head, ace);
2330                 }
2331
2332                 if( DEBUGLVL( 10 ) ) {
2333                         print_canon_ace(ace, ace_count);
2334                 }
2335         }
2336
2337         arrange_posix_perms(fname,&list_head );
2338
2339         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", list_head );
2340
2341         return list_head;
2342
2343   fail:
2344
2345         free_canon_ace_list(list_head);
2346         return NULL;
2347 }
2348
2349 /****************************************************************************
2350  Check if the current user group list contains a given group.
2351 ****************************************************************************/
2352
2353 static bool current_user_in_group(gid_t gid)
2354 {
2355         int i;
2356
2357         for (i = 0; i < current_user.ut.ngroups; i++) {
2358                 if (current_user.ut.groups[i] == gid) {
2359                         return True;
2360                 }
2361         }
2362
2363         return False;
2364 }
2365
2366 /****************************************************************************
2367  Should we override a deny ?  Check deprecated 'acl group control'
2368  and 'dos filemode'
2369 ****************************************************************************/
2370
2371 static bool acl_group_override(connection_struct *conn, gid_t prim_gid)
2372 {
2373         if ( (errno == EACCES || errno == EPERM)
2374                 && (lp_acl_group_control(SNUM(conn)) || lp_dos_filemode(SNUM(conn)))
2375                 && current_user_in_group(prim_gid))
2376         {
2377                 return True;
2378         }
2379
2380         return False;
2381 }
2382
2383 /****************************************************************************
2384  Attempt to apply an ACL to a file or directory.
2385 ****************************************************************************/
2386
2387 static bool set_canon_ace_list(files_struct *fsp, canon_ace *the_ace, bool default_ace, gid_t prim_gid, bool *pacl_set_support)
2388 {
2389         connection_struct *conn = fsp->conn;
2390         bool ret = False;
2391         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2392         canon_ace *p_ace;
2393         int i;
2394         SMB_ACL_ENTRY_T mask_entry;
2395         bool got_mask_entry = False;
2396         SMB_ACL_PERMSET_T mask_permset;
2397         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2398         bool needs_mask = False;
2399         mode_t mask_perms = 0;
2400
2401 #if defined(POSIX_ACL_NEEDS_MASK)
2402         /* HP-UX always wants to have a mask (called "class" there). */
2403         needs_mask = True;
2404 #endif
2405
2406         if (the_acl == NULL) {
2407
2408                 if (!no_acl_syscall_error(errno)) {
2409                         /*
2410                          * Only print this error message if we have some kind of ACL
2411                          * support that's not working. Otherwise we would always get this.
2412                          */
2413                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2414                                 default_ace ? "default" : "file", strerror(errno) ));
2415                 }
2416                 *pacl_set_support = False;
2417                 return False;
2418         }
2419
2420         if( DEBUGLVL( 10 )) {
2421                 dbgtext("set_canon_ace_list: setting ACL:\n");
2422                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2423                         print_canon_ace( p_ace, i);
2424                 }
2425         }
2426
2427         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2428                 SMB_ACL_ENTRY_T the_entry;
2429                 SMB_ACL_PERMSET_T the_permset;
2430
2431                 /*
2432                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2433                  * named group entries. But if there is an ACL_MASK entry, it applies
2434                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2435                  * so that it doesn't deny (i.e., mask off) any permissions.
2436                  */
2437
2438                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2439                         needs_mask = True;
2440                         mask_perms |= p_ace->perms;
2441                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2442                         mask_perms |= p_ace->perms;
2443                 }
2444
2445                 /*
2446                  * Get the entry for this ACE.
2447                  */
2448
2449                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2450                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2451                                 i, strerror(errno) ));
2452                         goto fail;
2453                 }
2454
2455                 if (p_ace->type == SMB_ACL_MASK) {
2456                         mask_entry = the_entry;
2457                         got_mask_entry = True;
2458                 }
2459
2460                 /*
2461                  * Ok - we now know the ACL calls should be working, don't
2462                  * allow fallback to chmod.
2463                  */
2464
2465                 *pacl_set_support = True;
2466
2467                 /*
2468                  * Initialise the entry from the canon_ace.
2469                  */
2470
2471                 /*
2472                  * First tell the entry what type of ACE this is.
2473                  */
2474
2475                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2476                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2477                                 i, strerror(errno) ));
2478                         goto fail;
2479                 }
2480
2481                 /*
2482                  * Only set the qualifier (user or group id) if the entry is a user
2483                  * or group id ACE.
2484                  */
2485
2486                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2487                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2488                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2489                                         i, strerror(errno) ));
2490                                 goto fail;
2491                         }
2492                 }
2493
2494                 /*
2495                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2496                  */
2497
2498                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2499                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2500                                 i, strerror(errno) ));
2501                         goto fail;
2502                 }
2503
2504                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2505                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2506                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2507                         goto fail;
2508                 }
2509
2510                 /*
2511                  * ..and apply them to the entry.
2512                  */
2513
2514                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2515                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2516                                 i, strerror(errno) ));
2517                         goto fail;
2518                 }
2519
2520                 if( DEBUGLVL( 10 ))
2521                         print_canon_ace( p_ace, i);
2522
2523         }
2524
2525         if (needs_mask && !got_mask_entry) {
2526                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2527                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2528                         goto fail;
2529                 }
2530
2531                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2532                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2533                         goto fail;
2534                 }
2535
2536                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2537                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2538                         goto fail;
2539                 }
2540
2541                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2542                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2543                         goto fail;
2544                 }
2545
2546                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2547                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2548                         goto fail;
2549                 }
2550         }
2551
2552         /*
2553          * Finally apply it to the file or directory.
2554          */
2555
2556         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2557                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2558                         /*
2559                          * Some systems allow all the above calls and only fail with no ACL support
2560                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2561                          */
2562                         if (no_acl_syscall_error(errno)) {
2563                                 *pacl_set_support = False;
2564                         }
2565
2566                         if (acl_group_override(conn, prim_gid)) {
2567                                 int sret;
2568
2569                                 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2570                                         fsp->fsp_name ));
2571
2572                                 become_root();
2573                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl);
2574                                 unbecome_root();
2575                                 if (sret == 0) {
2576                                         ret = True;
2577                                 }
2578                         }
2579
2580                         if (ret == False) {
2581                                 DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2582                                                 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2583                                                 fsp->fsp_name, strerror(errno) ));
2584                                 goto fail;
2585                         }
2586                 }
2587         } else {
2588                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2589                         /*
2590                          * Some systems allow all the above calls and only fail with no ACL support
2591                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2592                          */
2593                         if (no_acl_syscall_error(errno)) {
2594                                 *pacl_set_support = False;
2595                         }
2596
2597                         if (acl_group_override(conn, prim_gid)) {
2598                                 int sret;
2599
2600                                 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2601                                         fsp->fsp_name ));
2602
2603                                 become_root();
2604                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2605                                 unbecome_root();
2606                                 if (sret == 0) {
2607                                         ret = True;
2608                                 }
2609                         }
2610
2611                         if (ret == False) {
2612                                 DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2613                                                 fsp->fsp_name, strerror(errno) ));
2614                                 goto fail;
2615                         }
2616                 }
2617         }
2618
2619         ret = True;
2620
2621   fail:
2622
2623         if (the_acl != NULL) {
2624                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2625         }
2626
2627         return ret;
2628 }
2629
2630 /****************************************************************************
2631  Find a particular canon_ace entry.
2632 ****************************************************************************/
2633
2634 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2635 {
2636         while (list) {
2637                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2638                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2639                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2640                         break;
2641                 list = list->next;
2642         }
2643         return list;
2644 }
2645
2646 /****************************************************************************
2647
2648 ****************************************************************************/
2649
2650 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2651 {
2652         SMB_ACL_ENTRY_T entry;
2653
2654         if (!the_acl)
2655                 return NULL;
2656         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2657                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2658                 return NULL;
2659         }
2660         return the_acl;
2661 }
2662
2663 /****************************************************************************
2664  Convert a canon_ace to a generic 3 element permission - if possible.
2665 ****************************************************************************/
2666
2667 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2668
2669 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2670 {
2671         int snum = SNUM(fsp->conn);
2672         size_t ace_count = count_canon_ace_list(file_ace_list);
2673         canon_ace *ace_p;
2674         canon_ace *owner_ace = NULL;
2675         canon_ace *group_ace = NULL;
2676         canon_ace *other_ace = NULL;
2677         mode_t and_bits;
2678         mode_t or_bits;
2679
2680         if (ace_count != 3) {
2681                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2682 posix perms.\n", fsp->fsp_name ));
2683                 return False;
2684         }
2685
2686         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2687                 if (ace_p->owner_type == UID_ACE)
2688                         owner_ace = ace_p;
2689                 else if (ace_p->owner_type == GID_ACE)
2690                         group_ace = ace_p;
2691                 else if (ace_p->owner_type == WORLD_ACE)
2692                         other_ace = ace_p;
2693         }
2694
2695         if (!owner_ace || !group_ace || !other_ace) {
2696                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2697                                 fsp->fsp_name ));
2698                 return False;
2699         }
2700
2701         *posix_perms = (mode_t)0;
2702
2703         *posix_perms |= owner_ace->perms;
2704         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2705         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2706         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2707         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2708         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2709         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2710
2711         /* The owner must have at least read access. */
2712
2713         *posix_perms |= S_IRUSR;
2714         if (fsp->is_directory)
2715                 *posix_perms |= (S_IWUSR|S_IXUSR);
2716
2717         /* If requested apply the masks. */
2718
2719         /* Get the initial bits to apply. */
2720
2721         if (fsp->is_directory) {
2722                 and_bits = lp_dir_security_mask(snum);
2723                 or_bits = lp_force_dir_security_mode(snum);
2724         } else {
2725                 and_bits = lp_security_mask(snum);
2726                 or_bits = lp_force_security_mode(snum);
2727         }
2728
2729         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2730
2731         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2732                 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2733                 fsp->fsp_name ));
2734
2735         return True;
2736 }
2737
2738 /****************************************************************************
2739   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2740   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2741   with CI|OI set so it is inherited and also applies to the directory.
2742   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2743 ****************************************************************************/
2744
2745 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2746 {
2747         size_t i, j;
2748
2749         for (i = 0; i < num_aces; i++) {
2750                 for (j = i+1; j < num_aces; j++) {
2751                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2752                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2753                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2754                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2755
2756                         /* We know the lower number ACE's are file entries. */
2757                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2758                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2759                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2760                                 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2761                                 (i_inh == j_inh) &&
2762                                 (i_flags_ni == 0) &&
2763                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2764                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
2765                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
2766                                 /*
2767                                  * W2K wants to have access allowed zero access ACE's
2768                                  * at the end of the list. If the mask is zero, merge
2769                                  * the non-inherited ACE onto the inherited ACE.
2770                                  */
2771
2772                                 if (nt_ace_list[i].access_mask == 0) {
2773                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2774                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2775                                         if (num_aces - i - 1 > 0)
2776                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2777                                                                 sizeof(SEC_ACE));
2778
2779                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2780                                                 (unsigned int)i, (unsigned int)j ));
2781                                 } else {
2782                                         /*
2783                                          * These are identical except for the flags.
2784                                          * Merge the inherited ACE onto the non-inherited ACE.
2785                                          */
2786
2787                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2788                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2789                                         if (num_aces - j - 1 > 0)
2790                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
2791                                                                 sizeof(SEC_ACE));
2792
2793                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
2794                                                 (unsigned int)j, (unsigned int)i ));
2795                                 }
2796                                 num_aces--;
2797                                 break;
2798                         }
2799                 }
2800         }
2801
2802         return num_aces;
2803 }
2804
2805 /****************************************************************************
2806  Reply to query a security descriptor from an fsp. If it succeeds it allocates
2807  the space for the return elements and returns the size needed to return the
2808  security descriptor. This should be the only external function needed for
2809  the UNIX style get ACL.
2810 ****************************************************************************/
2811
2812 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
2813                                       const char *name,
2814                                       const SMB_STRUCT_STAT *sbuf,
2815                                       struct pai_val *pal,
2816                                       SMB_ACL_T posix_acl,
2817                                       SMB_ACL_T def_acl,
2818                                       uint32_t security_info,
2819                                       SEC_DESC **ppdesc)
2820 {
2821         DOM_SID owner_sid;
2822         DOM_SID group_sid;
2823         size_t sd_size = 0;
2824         SEC_ACL *psa = NULL;
2825         size_t num_acls = 0;
2826         size_t num_def_acls = 0;
2827         size_t num_aces = 0;
2828         canon_ace *file_ace = NULL;
2829         canon_ace *dir_ace = NULL;
2830         SEC_ACE *nt_ace_list = NULL;
2831         size_t num_profile_acls = 0;
2832         SEC_DESC *psd = NULL;
2833
2834         /*
2835          * Get the owner, group and world SIDs.
2836          */
2837
2838         if (lp_profile_acls(SNUM(conn))) {
2839                 /* For WXP SP1 the owner must be administrators. */
2840                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
2841                 sid_copy(&group_sid, &global_sid_Builtin_Users);
2842                 num_profile_acls = 2;
2843         } else {
2844                 create_file_sids(sbuf, &owner_sid, &group_sid);
2845         }
2846
2847         if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
2848
2849                 /*
2850                  * In the optimum case Creator Owner and Creator Group would be used for
2851                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
2852                  * would lead to usability problems under Windows: The Creator entries
2853                  * are only available in browse lists of directories and not for files;
2854                  * additionally the identity of the owning group couldn't be determined.
2855                  * We therefore use those identities only for Default ACLs.
2856                  */
2857
2858                 /* Create the canon_ace lists. */
2859                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
2860                                             &owner_sid, &group_sid, pal,
2861                                             SMB_ACL_TYPE_ACCESS);
2862
2863                 /* We must have *some* ACLS. */
2864
2865                 if (count_canon_ace_list(file_ace) == 0) {
2866                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
2867                         goto done;
2868                 }
2869
2870                 if (S_ISDIR(sbuf->st_mode) && def_acl) {
2871                         dir_ace = canonicalise_acl(conn, name, def_acl,
2872                                                    sbuf,
2873                                                    &global_sid_Creator_Owner,
2874                                                    &global_sid_Creator_Group,
2875                                                    pal, SMB_ACL_TYPE_DEFAULT);
2876                 }
2877
2878                 /*
2879                  * Create the NT ACE list from the canonical ace lists.
2880                  */
2881
2882                 {
2883                         canon_ace *ace;
2884                         enum security_ace_type nt_acl_type;
2885                         int i;
2886
2887                         if (nt4_compatible_acls() && dir_ace) {
2888                                 /*
2889                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
2890                                  * but no non-INHERIT_ONLY entry for one SID. So we only
2891                                  * remove entries from the Access ACL if the
2892                                  * corresponding Default ACL entries have also been
2893                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
2894                                  * are exceptions. We can do nothing
2895                                  * intelligent if the Default ACL contains entries that
2896                                  * are not also contained in the Access ACL, so this
2897                                  * case will still fail under NT 4.
2898                                  */
2899
2900                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
2901                                 if (ace && !ace->perms) {
2902                                         DLIST_REMOVE(dir_ace, ace);
2903                                         SAFE_FREE(ace);
2904
2905                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
2906                                         if (ace && !ace->perms) {
2907                                                 DLIST_REMOVE(file_ace, ace);
2908                                                 SAFE_FREE(ace);
2909                                         }
2910                                 }
2911
2912                                 /*
2913                                  * WinNT doesn't usually have Creator Group
2914                                  * in browse lists, so we send this entry to
2915                                  * WinNT even if it contains no relevant
2916                                  * permissions. Once we can add
2917                                  * Creator Group to browse lists we can
2918                                  * re-enable this.
2919                                  */
2920
2921 #if 0
2922                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
2923                                 if (ace && !ace->perms) {
2924                                         DLIST_REMOVE(dir_ace, ace);
2925                                         SAFE_FREE(ace);
2926                                 }
2927 #endif
2928
2929                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
2930                                 if (ace && !ace->perms) {
2931                                         DLIST_REMOVE(file_ace, ace);
2932                                         SAFE_FREE(ace);
2933                                 }
2934                         }
2935
2936                         num_acls = count_canon_ace_list(file_ace);
2937                         num_def_acls = count_canon_ace_list(dir_ace);
2938
2939                         /* Allocate the ace list. */
2940                         if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
2941                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
2942                                 goto done;
2943                         }
2944
2945                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
2946
2947                         /*
2948                          * Create the NT ACE list from the canonical ace lists.
2949                          */
2950
2951                         ace = file_ace;
2952
2953                         for (i = 0; i < num_acls; i++, ace = ace->next) {
2954                                 SEC_ACCESS acc;
2955
2956                                 acc = map_canon_ace_perms(SNUM(conn),
2957                                                 &nt_acl_type,
2958                                                 ace->perms,
2959                                                 S_ISDIR(sbuf->st_mode));
2960                                 init_sec_ace(&nt_ace_list[num_aces++],
2961                                         &ace->trustee,
2962                                         nt_acl_type,
2963                                         acc,
2964                                         ace->inherited ?
2965                                                 SEC_ACE_FLAG_INHERITED_ACE : 0);
2966                         }
2967
2968                         /* The User must have access to a profile share - even
2969                          * if we can't map the SID. */
2970                         if (lp_profile_acls(SNUM(conn))) {
2971                                 SEC_ACCESS acc;
2972
2973                                 init_sec_access(&acc,FILE_GENERIC_ALL);
2974                                 init_sec_ace(&nt_ace_list[num_aces++],
2975                                                 &global_sid_Builtin_Users,
2976                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
2977                                                 acc, 0);
2978                         }
2979
2980                         ace = dir_ace;
2981
2982                         for (i = 0; i < num_def_acls; i++, ace = ace->next) {
2983                                 SEC_ACCESS acc;
2984
2985                                 acc = map_canon_ace_perms(SNUM(conn),
2986                                                 &nt_acl_type,
2987                                                 ace->perms,
2988                                                 S_ISDIR(sbuf->st_mode));
2989                                 init_sec_ace(&nt_ace_list[num_aces++],
2990                                         &ace->trustee,
2991                                         nt_acl_type,
2992                                         acc,
2993                                         SEC_ACE_FLAG_OBJECT_INHERIT|
2994                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
2995                                         SEC_ACE_FLAG_INHERIT_ONLY|
2996                                         (ace->inherited ?
2997                                            SEC_ACE_FLAG_INHERITED_ACE : 0));
2998                         }
2999
3000                         /* The User must have access to a profile share - even
3001                          * if we can't map the SID. */
3002                         if (lp_profile_acls(SNUM(conn))) {
3003                                 SEC_ACCESS acc;
3004
3005                                 init_sec_access(&acc,FILE_GENERIC_ALL);
3006                                 init_sec_ace(&nt_ace_list[num_aces++], &global_sid_Builtin_Users, SEC_ACE_TYPE_ACCESS_ALLOWED, acc,
3007                                                 SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3008                                                 SEC_ACE_FLAG_INHERIT_ONLY|0);
3009                         }
3010
3011                         /*
3012                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3013                          * Win2K needs this to get the inheritance correct when replacing ACLs
3014                          * on a directory tree. Based on work by Jim @ IBM.
3015                          */
3016
3017                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3018
3019                 }
3020
3021                 if (num_aces) {
3022                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3023                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3024                                 goto done;
3025                         }
3026                 }
3027         } /* security_info & DACL_SECURITY_INFORMATION */
3028
3029         psd = make_standard_sec_desc( talloc_tos(),
3030                         (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3031                         (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3032                         psa,
3033                         &sd_size);
3034
3035         if(!psd) {
3036                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3037                 sd_size = 0;
3038                 goto done;
3039         }
3040
3041         /*
3042          * Windows 2000: The DACL_PROTECTED flag in the security
3043          * descriptor marks the ACL as non-inheriting, i.e., no
3044          * ACEs from higher level directories propagate to this
3045          * ACL. In the POSIX ACL model permissions are only
3046          * inherited at file create time, so ACLs never contain
3047          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3048          * flag doesn't seem to bother Windows NT.
3049          * Always set this if map acl inherit is turned off.
3050          */
3051         if (get_protected_flag(pal) || !lp_map_acl_inherit(SNUM(conn))) {
3052                 psd->type |= SE_DESC_DACL_PROTECTED;
3053         }
3054
3055         if (psd->dacl) {
3056                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3057         }
3058
3059         *ppdesc = psd;
3060
3061  done:
3062
3063         if (posix_acl) {
3064                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3065         }
3066         if (def_acl) {
3067                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3068         }
3069         free_canon_ace_list(file_ace);
3070         free_canon_ace_list(dir_ace);
3071         free_inherited_info(pal);
3072         SAFE_FREE(nt_ace_list);
3073
3074         return NT_STATUS_OK;
3075 }
3076
3077 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3078                            SEC_DESC **ppdesc)
3079 {
3080         SMB_STRUCT_STAT sbuf;
3081         SMB_ACL_T posix_acl = NULL;
3082         struct pai_val *pal;
3083
3084         *ppdesc = NULL;
3085
3086         DEBUG(10,("posix_fget_nt_acl: called for file %s\n", fsp->fsp_name ));
3087
3088         /* can it happen that fsp_name == NULL ? */
3089         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3090                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name,
3091                                         security_info, ppdesc);
3092         }
3093
3094         /* Get the stat struct for the owner info. */
3095         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3096                 return map_nt_error_from_unix(errno);
3097         }
3098
3099         /* Get the ACL from the fd. */
3100         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3101
3102         pal = fload_inherited_info(fsp);
3103
3104         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name, &sbuf, pal,
3105                                        posix_acl, NULL, security_info, ppdesc);
3106 }
3107
3108 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3109                           uint32_t security_info, SEC_DESC **ppdesc)
3110 {
3111         SMB_STRUCT_STAT sbuf;
3112         SMB_ACL_T posix_acl = NULL;
3113         SMB_ACL_T def_acl = NULL;
3114         struct pai_val *pal;
3115
3116         *ppdesc = NULL;
3117
3118         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3119
3120         /* Get the stat struct for the owner info. */
3121         if(SMB_VFS_STAT(conn, name, &sbuf) != 0) {
3122                 return map_nt_error_from_unix(errno);
3123         }
3124
3125         /* Get the ACL from the path. */
3126         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3127
3128         /* If it's a directory get the default POSIX ACL. */
3129         if(S_ISDIR(sbuf.st_mode)) {
3130                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3131                 def_acl = free_empty_sys_acl(conn, def_acl);
3132         }
3133
3134         pal = load_inherited_info(conn, name);
3135
3136         return posix_get_nt_acl_common(conn, name, &sbuf, pal, posix_acl,
3137                                        def_acl, security_info, ppdesc);
3138 }
3139
3140 /****************************************************************************
3141  Try to chown a file. We will be able to chown it under the following conditions.
3142
3143   1) If we have root privileges, then it will just work.
3144   2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3145   3) If we have SeRestorePrivilege we can change the user to any other user.
3146   4) If we have write permission to the file and dos_filemodes is set
3147      then allow chown to the currently authenticated user.
3148 ****************************************************************************/
3149
3150 int try_chown(connection_struct *conn, const char *fname, uid_t uid, gid_t gid)
3151 {
3152         int ret;
3153         files_struct *fsp;
3154         SMB_STRUCT_STAT st;
3155
3156         if(!CAN_WRITE(conn)) {
3157                 return -1;
3158         }
3159
3160         /* Case (1). */
3161         /* try the direct way first */
3162         ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
3163         if (ret == 0)
3164                 return 0;
3165
3166         /* Case (2) / (3) */
3167         if (lp_enable_privileges()) {
3168
3169                 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3170                                                               &se_take_ownership);
3171                 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3172                                                        &se_restore);
3173
3174                 /* Case (2) */
3175                 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3176                 /* Case (3) */
3177                      ( has_restore_priv ) ) {
3178
3179                         become_root();
3180                         /* Keep the current file gid the same - take ownership doesn't imply group change. */
3181                         ret = SMB_VFS_CHOWN(conn, fname, uid, (gid_t)-1);
3182                         unbecome_root();
3183                         return ret;
3184                 }
3185         }
3186
3187         /* Case (4). */
3188         if (!lp_dos_filemode(SNUM(conn))) {
3189                 errno = EPERM;
3190                 return -1;
3191         }
3192
3193         if (SMB_VFS_STAT(conn,fname,&st)) {
3194                 return -1;
3195         }
3196
3197         if (!NT_STATUS_IS_OK(open_file_fchmod(conn,fname,&st,&fsp))) {
3198                 return -1;
3199         }
3200
3201         /* only allow chown to the current user. This is more secure,
3202            and also copes with the case where the SID in a take ownership ACL is
3203            a local SID on the users workstation
3204         */
3205         uid = current_user.ut.uid;
3206
3207         become_root();
3208         /* Keep the current file gid the same. */
3209         ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3210         unbecome_root();
3211
3212         close_file_fchmod(fsp);
3213
3214         return ret;
3215 }
3216
3217 /****************************************************************************
3218  Take care of parent ACL inheritance.
3219 ****************************************************************************/
3220
3221 static NTSTATUS append_parent_acl(files_struct *fsp,
3222                                 SMB_STRUCT_STAT *psbuf,
3223                                 SEC_DESC *psd,
3224                                 SEC_DESC **pp_new_sd)
3225 {
3226         SEC_DESC *parent_sd = NULL;
3227         files_struct *parent_fsp = NULL;
3228         TALLOC_CTX *mem_ctx = talloc_parent(psd);
3229         char *parent_name = NULL;
3230         SEC_ACE *new_ace = NULL;
3231         unsigned int num_aces = psd->dacl->num_aces;
3232         SMB_STRUCT_STAT sbuf;
3233         NTSTATUS status;
3234         int info;
3235         unsigned int i, j;
3236         bool is_dacl_protected = (psd->type & SE_DESC_DACL_PROTECTED);
3237
3238         ZERO_STRUCT(sbuf);
3239
3240         if (mem_ctx == NULL) {
3241                 return NT_STATUS_NO_MEMORY;
3242         }
3243
3244         if (!parent_dirname_talloc(mem_ctx,
3245                                 fsp->fsp_name,
3246                                 &parent_name,
3247                                 NULL)) {
3248                 return NT_STATUS_NO_MEMORY;
3249         }
3250
3251         status = open_directory(fsp->conn,
3252                                 NULL,
3253                                 parent_name,
3254                                 &sbuf,
3255                                 FILE_READ_ATTRIBUTES, /* Just a stat open */
3256                                 FILE_SHARE_NONE, /* Ignored for stat opens */
3257                                 FILE_OPEN,
3258                                 0,
3259                                 INTERNAL_OPEN_ONLY,
3260                                 &info,
3261                                 &parent_fsp);
3262
3263         if (!NT_STATUS_IS_OK(status)) {
3264                 return status;
3265         }
3266
3267         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, parent_fsp->fsp_name,
3268                                     DACL_SECURITY_INFORMATION, &parent_sd );
3269
3270         close_file(parent_fsp, NORMAL_CLOSE);
3271
3272         if (!NT_STATUS_IS_OK(status)) {
3273                 return status;
3274         }
3275
3276         /*
3277          * Make room for potentially all the ACLs from
3278          * the parent. We used to add the ugw triple here,
3279          * as we knew we were dealing with POSIX ACLs.
3280          * We no longer need to do so as we can guarentee
3281          * that a default ACL from the parent directory will
3282          * be well formed for POSIX ACLs if it came from a
3283          * POSIX ACL source, and if we're not writing to a
3284          * POSIX ACL sink then we don't care if it's not well
3285          * formed. JRA.
3286          */
3287
3288         num_aces += parent_sd->dacl->num_aces;
3289
3290         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3291                                         num_aces)) == NULL) {
3292                 return NT_STATUS_NO_MEMORY;
3293         }
3294
3295         /* Start by copying in all the given ACE entries. */
3296         for (i = 0; i < psd->dacl->num_aces; i++) {
3297                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3298         }
3299
3300         /*
3301          * Note that we're ignoring "inherit permissions" here
3302          * as that really only applies to newly created files. JRA.
3303          */
3304
3305         /* Finally append any inherited ACEs. */
3306         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3307                 SEC_ACE *se = &parent_sd->dacl->aces[j];
3308
3309                 if (fsp->is_directory) {
3310                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3311                                 /* Doesn't apply to a directory - ignore. */
3312                                 DEBUG(10,("append_parent_acl: directory %s "
3313                                         "ignoring non container "
3314                                         "inherit flags %u on ACE with sid %s "
3315                                         "from parent %s\n",
3316                                         fsp->fsp_name,
3317                                         (unsigned int)se->flags,
3318                                         sid_string_dbg(&se->trustee),
3319                                         parent_name));
3320                                 continue;
3321                         }
3322                 } else {
3323                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3324                                 /* Doesn't apply to a file - ignore. */
3325                                 DEBUG(10,("append_parent_acl: file %s "
3326                                         "ignoring non object "
3327                                         "inherit flags %u on ACE with sid %s "
3328                                         "from parent %s\n",
3329                                         fsp->fsp_name,
3330                                         (unsigned int)se->flags,
3331                                         sid_string_dbg(&se->trustee),
3332                                         parent_name));
3333                                 continue;
3334                         }
3335                 }
3336
3337                 if (is_dacl_protected) {
3338                         /* If the DACL is protected it means we must
3339                          * not overwrite an existing ACE entry with the
3340                          * same SID. This is order N^2. Ouch :-(. JRA. */
3341                         unsigned int k;
3342                         for (k = 0; k < psd->dacl->num_aces; k++) {
3343                                 if (sid_equal(&psd->dacl->aces[k].trustee,
3344                                                 &se->trustee)) {
3345                                         break;
3346                                 }
3347                         }
3348                         if (k < psd->dacl->num_aces) {
3349                                 /* SID matched. Ignore. */
3350                                 DEBUG(10,("append_parent_acl: path %s "
3351                                         "ignoring ACE with protected sid %s "
3352                                         "from parent %s\n",
3353                                         fsp->fsp_name,
3354                                         sid_string_dbg(&se->trustee),
3355                                         parent_name));
3356                                 continue;
3357                         }
3358                 }
3359
3360                 sec_ace_copy(&new_ace[i], se);
3361                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3362                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3363                 }
3364                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3365
3366                 if (fsp->is_directory) {
3367                         /*
3368                          * Strip off any inherit only. It's applied.
3369                          */
3370                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3371                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3372                                 /* No further inheritance. */
3373                                 new_ace[i].flags &=
3374                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3375                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3376                         }
3377                 } else {
3378                         /*
3379                          * Strip off any container or inherit
3380                          * flags, they can't apply to objects.
3381                          */
3382                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3383                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3384                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3385                 }
3386                 i++;
3387
3388                 DEBUG(10,("append_parent_acl: path %s "
3389                         "inheriting ACE with sid %s "
3390                         "from parent %s\n",
3391                         fsp->fsp_name,
3392                         sid_string_dbg(&se->trustee),
3393                         parent_name));
3394         }
3395
3396         parent_sd->dacl->aces = new_ace;
3397         parent_sd->dacl->num_aces = i;
3398
3399         *pp_new_sd = parent_sd;
3400         return status;
3401 }
3402
3403 /****************************************************************************
3404  Reply to set a security descriptor on an fsp. security_info_sent is the
3405  description of the following NT ACL.
3406  This should be the only external function needed for the UNIX style set ACL.
3407 ****************************************************************************/
3408
3409 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, SEC_DESC *psd)
3410 {
3411         connection_struct *conn = fsp->conn;
3412         uid_t user = (uid_t)-1;
3413         gid_t grp = (gid_t)-1;
3414         SMB_STRUCT_STAT sbuf;
3415         DOM_SID file_owner_sid;
3416         DOM_SID file_grp_sid;
3417         canon_ace *file_ace_list = NULL;
3418         canon_ace *dir_ace_list = NULL;
3419         bool acl_perms = False;
3420         mode_t orig_mode = (mode_t)0;
3421         NTSTATUS status;
3422         uid_t orig_uid;
3423         gid_t orig_gid;
3424         bool need_chown = False;
3425
3426         DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
3427
3428         if (!CAN_WRITE(conn)) {
3429                 DEBUG(10,("set acl rejected on read-only share\n"));
3430                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3431         }
3432
3433         /*
3434          * Get the current state of the file.
3435          */
3436
3437         if(fsp->is_directory || fsp->fh->fd == -1) {
3438                 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0)
3439                         return map_nt_error_from_unix(errno);
3440         } else {
3441                 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0)
3442                         return map_nt_error_from_unix(errno);
3443         }
3444
3445         /* Save the original elements we check against. */
3446         orig_mode = sbuf.st_mode;
3447         orig_uid = sbuf.st_uid;
3448         orig_gid = sbuf.st_gid;
3449
3450         /*
3451          * Unpack the user/group/world id's.
3452          */
3453
3454         status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3455         if (!NT_STATUS_IS_OK(status)) {
3456                 return status;
3457         }
3458
3459         /*
3460          * Do we need to chown ?
3461          */
3462
3463         if (((user != (uid_t)-1) && (orig_uid != user)) || (( grp != (gid_t)-1) && (orig_gid != grp))) {
3464                 need_chown = True;
3465         }
3466
3467         if (need_chown && (user == (uid_t)-1 || user == current_user.ut.uid)) {
3468
3469                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3470                                 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3471
3472                 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3473                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3474                                 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3475                         if (errno == EPERM) {
3476                                 return NT_STATUS_INVALID_OWNER;
3477                         }
3478                         return map_nt_error_from_unix(errno);
3479                 }
3480
3481                 /*
3482                  * Recheck the current state of the file, which may have changed.
3483                  * (suid/sgid bits, for instance)
3484                  */
3485
3486                 if(fsp->is_directory) {
3487                         if(SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
3488                                 return map_nt_error_from_unix(errno);
3489                         }
3490                 } else {
3491
3492                         int ret;
3493
3494                         if(fsp->fh->fd == -1)
3495                                 ret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf);
3496                         else
3497                                 ret = SMB_VFS_FSTAT(fsp, &sbuf);
3498
3499                         if(ret != 0)
3500                                 return map_nt_error_from_unix(errno);
3501                 }
3502
3503                 /* Save the original elements we check against. */
3504                 orig_mode = sbuf.st_mode;
3505                 orig_uid = sbuf.st_uid;
3506                 orig_gid = sbuf.st_gid;
3507
3508                 /* We did chown already, drop the flag */
3509                 need_chown = False;
3510         }
3511
3512         create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3513
3514         if ((security_info_sent & DACL_SECURITY_INFORMATION) &&
3515                 psd->dacl != NULL &&
3516                 (psd->type & (SE_DESC_DACL_AUTO_INHERITED|
3517                               SE_DESC_DACL_AUTO_INHERIT_REQ))==
3518                         (SE_DESC_DACL_AUTO_INHERITED|
3519                          SE_DESC_DACL_AUTO_INHERIT_REQ) ) {
3520                 status = append_parent_acl(fsp, &sbuf, psd, &psd);
3521                 if (!NT_STATUS_IS_OK(status)) {
3522                         return status;
3523                 }
3524         }
3525
3526         acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3527                                         &file_ace_list, &dir_ace_list, security_info_sent, psd);
3528
3529         /* Ignore W2K traverse DACL set. */
3530         if (file_ace_list || dir_ace_list) {
3531
3532                 if (!acl_perms) {
3533                         DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3534                         free_canon_ace_list(file_ace_list);
3535                         free_canon_ace_list(dir_ace_list);
3536                         return NT_STATUS_ACCESS_DENIED;
3537                 }
3538
3539                 /*
3540                  * Only change security if we got a DACL.
3541                  */
3542
3543                 if((security_info_sent & DACL_SECURITY_INFORMATION) && (psd->dacl != NULL)) {
3544
3545                         bool acl_set_support = False;
3546                         bool ret = False;
3547
3548                         /*
3549                          * Try using the POSIX ACL set first. Fall back to chmod if
3550                          * we have no ACL support on this filesystem.
3551                          */
3552
3553                         if (acl_perms && file_ace_list) {
3554                                 ret = set_canon_ace_list(fsp, file_ace_list, False, sbuf.st_gid, &acl_set_support);
3555                                 if (acl_set_support && ret == False) {
3556                                         DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3557                                         free_canon_ace_list(file_ace_list);
3558                                         free_canon_ace_list(dir_ace_list);
3559                                         return map_nt_error_from_unix(errno);
3560                                 }
3561                         }
3562
3563                         if (acl_perms && acl_set_support && fsp->is_directory) {
3564                                 if (dir_ace_list) {
3565                                         if (!set_canon_ace_list(fsp, dir_ace_list, True, sbuf.st_gid, &acl_set_support)) {
3566                                                 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3567                                                 free_canon_ace_list(file_ace_list);
3568                                                 free_canon_ace_list(dir_ace_list);
3569                                                 return map_nt_error_from_unix(errno);
3570                                         }
3571                                 } else {
3572
3573                                         /*
3574                                          * No default ACL - delete one if it exists.
3575                                          */
3576
3577                                         if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name) == -1) {
3578                                                 int sret = -1;
3579
3580                                                 if (acl_group_override(conn, sbuf.st_gid)) {
3581                                                         DEBUG(5,("set_nt_acl: acl group control on and "
3582                                                                 "current user in file %s primary group. Override delete_def_acl\n",
3583                                                                 fsp->fsp_name ));
3584
3585                                                         become_root();
3586                                                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3587                                                         unbecome_root();
3588                                                 }
3589
3590                                                 if (sret == -1) {
3591                                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3592                                                         free_canon_ace_list(file_ace_list);
3593                                                         free_canon_ace_list(dir_ace_list);
3594                                                         return map_nt_error_from_unix(errno);
3595                                                 }
3596                                         }
3597                                 }
3598                         }
3599
3600                         if (acl_set_support) {
3601                                 store_inheritance_attributes(fsp, file_ace_list, dir_ace_list,
3602                                                 (psd->type & SE_DESC_DACL_PROTECTED) ? True : False);
3603                         }
3604
3605                         /*
3606                          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3607                          */
3608
3609                         if(!acl_set_support && acl_perms) {
3610                                 mode_t posix_perms;
3611
3612                                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3613                                         free_canon_ace_list(file_ace_list);
3614                                         free_canon_ace_list(dir_ace_list);
3615                                         DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3616                                                 fsp->fsp_name ));
3617                                         return NT_STATUS_ACCESS_DENIED;
3618                                 }
3619
3620                                 if (orig_mode != posix_perms) {
3621
3622                                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3623                                                 fsp->fsp_name, (unsigned int)posix_perms ));
3624
3625                                         if(SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms) == -1) {
3626                                                 int sret = -1;
3627                                                 if (acl_group_override(conn, sbuf.st_gid)) {
3628                                                         DEBUG(5,("set_nt_acl: acl group control on and "
3629                                                                 "current user in file %s primary group. Override chmod\n",
3630                                                                 fsp->fsp_name ));
3631
3632                                                         become_root();
3633                                                         sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3634                                                         unbecome_root();
3635                                                 }
3636
3637                                                 if (sret == -1) {
3638                                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3639                                                                 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3640                                                         free_canon_ace_list(file_ace_list);
3641                                                         free_canon_ace_list(dir_ace_list);
3642                                                         return map_nt_error_from_unix(errno);
3643                                                 }
3644                                         }
3645                                 }
3646                         }
3647                 }
3648
3649                 free_canon_ace_list(file_ace_list);
3650                 free_canon_ace_list(dir_ace_list);
3651         }
3652
3653         /* Any chown pending? */
3654         if (need_chown) {
3655                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3656                          fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3657
3658                 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3659                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3660                                  fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3661                         if (errno == EPERM) {
3662                                 return NT_STATUS_INVALID_OWNER;
3663                         }
3664                         return map_nt_error_from_unix(errno);
3665                 }
3666         }
3667
3668         return NT_STATUS_OK;
3669 }
3670
3671 /****************************************************************************
3672  Get the actual group bits stored on a file with an ACL. Has no effect if
3673  the file has no ACL. Needed in dosmode code where the stat() will return
3674  the mask bits, not the real group bits, for a file with an ACL.
3675 ****************************************************************************/
3676
3677 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3678 {
3679         int entry_id = SMB_ACL_FIRST_ENTRY;
3680         SMB_ACL_ENTRY_T entry;
3681         SMB_ACL_T posix_acl;
3682         int result = -1;
3683
3684         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3685         if (posix_acl == (SMB_ACL_T)NULL)
3686                 return -1;
3687
3688         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3689                 SMB_ACL_TAG_T tagtype;
3690                 SMB_ACL_PERMSET_T permset;
3691
3692                 /* get_next... */
3693                 if (entry_id == SMB_ACL_FIRST_ENTRY)
3694                         entry_id = SMB_ACL_NEXT_ENTRY;
3695
3696                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3697                         break;
3698
3699                 if (tagtype == SMB_ACL_GROUP_OBJ) {
3700                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3701                                 break;
3702                         } else {
3703                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
3704                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3705                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3706                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3707                                 result = 0;
3708                                 break;
3709                         }
3710                 }
3711         }
3712         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3713         return result;
3714 }
3715
3716 /****************************************************************************
3717  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3718  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3719 ****************************************************************************/
3720
3721 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
3722 {
3723         int entry_id = SMB_ACL_FIRST_ENTRY;
3724         SMB_ACL_ENTRY_T entry;
3725         int num_entries = 0;
3726
3727         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3728                 SMB_ACL_TAG_T tagtype;
3729                 SMB_ACL_PERMSET_T permset;
3730                 mode_t perms;
3731
3732                 /* get_next... */
3733                 if (entry_id == SMB_ACL_FIRST_ENTRY)
3734                         entry_id = SMB_ACL_NEXT_ENTRY;
3735
3736                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
3737                         return -1;
3738
3739                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
3740                         return -1;
3741
3742                 num_entries++;
3743
3744                 switch(tagtype) {
3745                         case SMB_ACL_USER_OBJ:
3746                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
3747                                 break;
3748                         case SMB_ACL_GROUP_OBJ:
3749                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
3750                                 break;
3751                         case SMB_ACL_MASK:
3752                                 /*
3753                                  * FIXME: The ACL_MASK entry permissions should really be set to
3754                                  * the union of the permissions of all ACL_USER,
3755                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
3756                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
3757                                  */
3758                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
3759                                 break;
3760                         case SMB_ACL_OTHER:
3761                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
3762                                 break;
3763                         default:
3764                                 continue;
3765                 }
3766
3767                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
3768                         return -1;
3769
3770                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
3771                         return -1;
3772         }
3773
3774         /*
3775          * If this is a simple 3 element ACL or no elements then it's a standard
3776          * UNIX permission set. Just use chmod...
3777          */
3778
3779         if ((num_entries == 3) || (num_entries == 0))
3780                 return -1;
3781
3782         return 0;
3783 }
3784
3785 /****************************************************************************
3786  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
3787  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
3788  resulting ACL on TO.  Note that name is in UNIX character set.
3789 ****************************************************************************/
3790
3791 static int copy_access_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
3792 {
3793         SMB_ACL_T posix_acl = NULL;
3794         int ret = -1;
3795
3796         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
3797                 return -1;
3798
3799         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3800                 goto done;
3801
3802         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
3803
3804  done:
3805
3806         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3807         return ret;
3808 }
3809
3810 /****************************************************************************
3811  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3812  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3813  Note that name is in UNIX character set.
3814 ****************************************************************************/
3815
3816 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
3817 {
3818         return copy_access_acl(conn, name, name, mode);
3819 }
3820
3821 /****************************************************************************
3822  If the parent directory has no default ACL but it does have an Access ACL,
3823  inherit this Access ACL to file name.
3824 ****************************************************************************/
3825
3826 int inherit_access_acl(connection_struct *conn, const char *inherit_from_dir,
3827                        const char *name, mode_t mode)
3828 {
3829         if (directory_has_default_acl(conn, inherit_from_dir))
3830                 return 0;
3831
3832         return copy_access_acl(conn, inherit_from_dir, name, mode);
3833 }
3834
3835 /****************************************************************************
3836  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3837  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3838 ****************************************************************************/
3839
3840 int fchmod_acl(files_struct *fsp, mode_t mode)
3841 {
3842         connection_struct *conn = fsp->conn;
3843         SMB_ACL_T posix_acl = NULL;
3844         int ret = -1;
3845
3846         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
3847                 return -1;
3848
3849         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3850                 goto done;
3851
3852         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
3853
3854   done:
3855
3856         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3857         return ret;
3858 }
3859
3860 /****************************************************************************
3861  Check for an existing default POSIX ACL on a directory.
3862 ****************************************************************************/
3863
3864 bool directory_has_default_acl(connection_struct *conn, const char *fname)
3865 {
3866         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
3867         bool has_acl = False;
3868         SMB_ACL_ENTRY_T entry;
3869
3870         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
3871                 has_acl = True;
3872         }
3873
3874         if (def_acl) {
3875                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3876         }
3877         return has_acl;
3878 }
3879
3880 /****************************************************************************
3881  Map from wire type to permset.
3882 ****************************************************************************/
3883
3884 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
3885 {
3886         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
3887                 return False;
3888         }
3889
3890         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
3891                 return False;
3892         }
3893
3894         if (wire_perm & SMB_POSIX_ACL_READ) {
3895                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
3896                         return False;
3897                 }
3898         }
3899         if (wire_perm & SMB_POSIX_ACL_WRITE) {
3900                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
3901                         return False;
3902                 }
3903         }
3904         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
3905                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
3906                         return False;
3907                 }
3908         }
3909         return True;
3910 }
3911
3912 /****************************************************************************
3913  Map from wire type to tagtype.
3914 ****************************************************************************/
3915
3916 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
3917 {
3918         switch (wire_tt) {
3919                 case SMB_POSIX_ACL_USER_OBJ:
3920                         *p_tt = SMB_ACL_USER_OBJ;
3921                         break;
3922                 case SMB_POSIX_ACL_USER:
3923                         *p_tt = SMB_ACL_USER;
3924                         break;
3925                 case SMB_POSIX_ACL_GROUP_OBJ:
3926                         *p_tt = SMB_ACL_GROUP_OBJ;
3927                         break;
3928                 case SMB_POSIX_ACL_GROUP:
3929                         *p_tt = SMB_ACL_GROUP;
3930                         break;
3931                 case SMB_POSIX_ACL_MASK:
3932                         *p_tt = SMB_ACL_MASK;
3933                         break;
3934                 case SMB_POSIX_ACL_OTHER:
3935                         *p_tt = SMB_ACL_OTHER;
3936                         break;
3937                 default:
3938                         return False;
3939         }
3940         return True;
3941 }
3942
3943 /****************************************************************************
3944  Create a new POSIX acl from wire permissions.
3945  FIXME ! How does the share mask/mode fit into this.... ?
3946 ****************************************************************************/
3947
3948 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
3949 {
3950         unsigned int i;
3951         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
3952
3953         if (the_acl == NULL) {
3954                 return NULL;
3955         }
3956
3957         for (i = 0; i < num_acls; i++) {
3958                 SMB_ACL_ENTRY_T the_entry;
3959                 SMB_ACL_PERMSET_T the_permset;
3960                 SMB_ACL_TAG_T tag_type;
3961
3962                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
3963                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
3964                                 i, strerror(errno) ));
3965                         goto fail;
3966                 }
3967
3968                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
3969                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
3970                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
3971                         goto fail;
3972                 }
3973
3974                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
3975                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
3976                                 i, strerror(errno) ));
3977                         goto fail;
3978                 }
3979
3980                 /* Get the permset pointer from the new ACL entry. */
3981                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
3982                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
3983                                 i, strerror(errno) ));
3984                         goto fail;
3985                 }
3986
3987                 /* Map from wire to permissions. */
3988                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
3989                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
3990                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
3991                         goto fail;
3992                 }
3993
3994                 /* Now apply to the new ACL entry. */
3995                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
3996                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
3997                                 i, strerror(errno) ));
3998                         goto fail;
3999                 }
4000
4001                 if (tag_type == SMB_ACL_USER) {
4002                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4003                         uid_t uid = (uid_t)uidval;
4004                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4005                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4006                                         (unsigned int)uid, i, strerror(errno) ));
4007                                 goto fail;
4008                         }
4009                 }
4010
4011                 if (tag_type == SMB_ACL_GROUP) {
4012                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4013                         gid_t gid = (uid_t)gidval;
4014                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4015                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4016                                         (unsigned int)gid, i, strerror(errno) ));
4017                                 goto fail;
4018                         }
4019                 }
4020         }
4021
4022         return the_acl;
4023
4024  fail:
4025
4026         if (the_acl != NULL) {
4027                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4028         }
4029         return NULL;
4030 }
4031
4032 /****************************************************************************
4033  Calls from UNIX extensions - Default POSIX ACL set.
4034  If num_def_acls == 0 and not a directory just return. If it is a directory
4035  and num_def_acls == 0 then remove the default acl. Else set the default acl
4036  on the directory.
4037 ****************************************************************************/
4038
4039 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
4040                                 uint16 num_def_acls, const char *pdata)
4041 {
4042         SMB_ACL_T def_acl = NULL;
4043
4044         if (num_def_acls && !S_ISDIR(psbuf->st_mode)) {
4045                 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4046                 errno = EISDIR;
4047                 return False;
4048         }
4049
4050         if (!num_def_acls) {
4051                 /* Remove the default ACL. */
4052                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4053                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4054                                 fname, strerror(errno) ));
4055                         return False;
4056                 }
4057                 return True;
4058         }
4059
4060         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4061                 return False;
4062         }
4063
4064         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4065                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4066                         fname, strerror(errno) ));
4067                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4068                 return False;
4069         }
4070
4071         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4072         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4073         return True;
4074 }
4075
4076 /****************************************************************************
4077  Remove an ACL from a file. As we don't have acl_delete_entry() available
4078  we must read the current acl and copy all entries except MASK, USER and GROUP
4079  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4080  removed.
4081  FIXME ! How does the share mask/mode fit into this.... ?
4082 ****************************************************************************/
4083
4084 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4085 {
4086         SMB_ACL_T file_acl = NULL;
4087         int entry_id = SMB_ACL_FIRST_ENTRY;
4088         SMB_ACL_ENTRY_T entry;
4089         bool ret = False;
4090         /* Create a new ACL with only 3 entries, u/g/w. */
4091         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4092         SMB_ACL_ENTRY_T user_ent = NULL;
4093         SMB_ACL_ENTRY_T group_ent = NULL;
4094         SMB_ACL_ENTRY_T other_ent = NULL;
4095
4096         if (new_file_acl == NULL) {
4097                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4098                 return False;
4099         }
4100
4101         /* Now create the u/g/w entries. */
4102         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4103                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4104                         fname, strerror(errno) ));
4105                 goto done;
4106         }
4107         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4108                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4109                         fname, strerror(errno) ));
4110                 goto done;
4111         }
4112
4113         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4114                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4115                         fname, strerror(errno) ));
4116                 goto done;
4117         }
4118         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4119                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4120                         fname, strerror(errno) ));
4121                 goto done;
4122         }
4123
4124         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4125                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4126                         fname, strerror(errno) ));
4127                 goto done;
4128         }
4129         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4130                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4131                         fname, strerror(errno) ));
4132                 goto done;
4133         }
4134
4135         /* Get the current file ACL. */
4136         if (fsp && fsp->fh->fd != -1) {
4137                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4138         } else {
4139                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4140         }
4141
4142         if (file_acl == NULL) {
4143                 /* This is only returned if an error occurred. Even for a file with
4144                    no acl a u/g/w acl should be returned. */
4145                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4146                         fname, strerror(errno) ));
4147                 goto done;
4148         }
4149
4150         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4151                 SMB_ACL_TAG_T tagtype;
4152                 SMB_ACL_PERMSET_T permset;
4153
4154                 /* get_next... */
4155                 if (entry_id == SMB_ACL_FIRST_ENTRY)
4156                         entry_id = SMB_ACL_NEXT_ENTRY;
4157
4158                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4159                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4160                                 fname, strerror(errno) ));
4161                         goto done;
4162                 }
4163
4164                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4165                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4166                                 fname, strerror(errno) ));
4167                         goto done;
4168                 }
4169
4170                 if (tagtype == SMB_ACL_USER_OBJ) {
4171                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4172                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4173                                         fname, strerror(errno) ));
4174                         }
4175                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4176                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4177                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4178                                         fname, strerror(errno) ));
4179                         }
4180                 } else if (tagtype == SMB_ACL_OTHER) {
4181                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4182                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4183                                         fname, strerror(errno) ));
4184                         }
4185                 }
4186         }
4187
4188         /* Set the new empty file ACL. */
4189         if (fsp && fsp->fh->fd != -1) {
4190                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4191                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4192                                 fname, strerror(errno) ));
4193                         goto done;
4194                 }
4195         } else {
4196                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4197                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4198                                 fname, strerror(errno) ));
4199                         goto done;
4200                 }
4201         }
4202
4203         ret = True;
4204
4205  done:
4206
4207         if (file_acl) {
4208                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4209         }
4210         if (new_file_acl) {
4211                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4212         }
4213         return ret;
4214 }
4215
4216 /****************************************************************************
4217  Calls from UNIX extensions - POSIX ACL set.
4218  If num_def_acls == 0 then read/modify/write acl after removing all entries
4219  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4220 ****************************************************************************/
4221
4222 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4223 {
4224         SMB_ACL_T file_acl = NULL;
4225
4226         if (!num_acls) {
4227                 /* Remove the ACL from the file. */
4228                 return remove_posix_acl(conn, fsp, fname);
4229         }
4230
4231         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4232                 return False;
4233         }
4234
4235         if (fsp && fsp->fh->fd != -1) {
4236                 /* The preferred way - use an open fd. */
4237                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4238                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4239                                 fname, strerror(errno) ));
4240                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4241                         return False;
4242                 }
4243         } else {
4244                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4245                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4246                                 fname, strerror(errno) ));
4247                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4248                         return False;
4249                 }
4250         }
4251
4252         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4253         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4254         return True;
4255 }
4256
4257 /********************************************************************
4258  Pull the NT ACL from a file on disk or the OpenEventlog() access
4259  check.  Caller is responsible for freeing the returned security
4260  descriptor via TALLOC_FREE().  This is designed for dealing with
4261  user space access checks in smbd outside of the VFS.  For example,
4262  checking access rights in OpenEventlog().
4263
4264  Assume we are dealing with files (for now)
4265 ********************************************************************/
4266
4267 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4268 {
4269         SEC_DESC *psd, *ret_sd;
4270         connection_struct conn;
4271         files_struct finfo;
4272         struct fd_handle fh;
4273
4274         ZERO_STRUCT( conn );
4275
4276         if ( !(conn.mem_ctx = talloc_init( "novfs_get_nt_acl" )) ) {
4277                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4278                 return NULL;
4279         }
4280
4281         if (!(conn.params = TALLOC_P(conn.mem_ctx, struct share_params))) {
4282                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4283                 TALLOC_FREE(conn.mem_ctx);
4284                 return NULL;
4285         }
4286
4287         conn.params->service = -1;
4288
4289         set_conn_connectpath(&conn, "/");
4290
4291         if (!smbd_vfs_init(&conn)) {
4292                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4293                 conn_free_internal( &conn );
4294                 return NULL;
4295         }
4296
4297         ZERO_STRUCT( finfo );
4298         ZERO_STRUCT( fh );
4299
4300         finfo.fnum = -1;
4301         finfo.conn = &conn;
4302         finfo.fh = &fh;
4303         finfo.fh->fd = -1;
4304         finfo.fsp_name = CONST_DISCARD(char *,fname);
4305
4306         if (!NT_STATUS_IS_OK(posix_fget_nt_acl( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4307                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4308                 conn_free_internal( &conn );
4309                 return NULL;
4310         }
4311
4312         ret_sd = dup_sec_desc( ctx, psd );
4313
4314         conn_free_internal( &conn );
4315
4316         return ret_sd;
4317 }