source/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 2 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, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 extern struct current_user current_user;
  25 extern struct generic_mapping file_generic_mapping;
  26
  27 #undef  DBGC_CLASS
  28 #define DBGC_CLASS DBGC_ACLS
  29
  30 /****************************************************************************
  31  Data structures representing the internal ACE format.
  32 ****************************************************************************/
  33
  34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  36
  37 typedef union posix_id {
  38                 uid_t uid;
  39                 gid_t gid;
  40                 int world;
  41 } posix_id;
  42
  43 typedef struct canon_ace {
  44         struct canon_ace *next, *prev;
  45         SMB_ACL_TAG_T type;
  46         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  47         DOM_SID trustee;
  48         enum ace_owner owner_type;
  49         enum ace_attribute attr;
  50         posix_id unix_ug;
  51         BOOL inherited;
  52 } canon_ace;
  53
  54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  55
  56 /*
  57  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  58  * attribute on disk.
  59  *
  60  * |  1   |  1   |   2         |         2           |  ....
  61  * +------+------+-------------+---------------------+-------------+--------------------+
  62  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  63  * +------+------+-------------+---------------------+-------------+--------------------+
  64  */
  65
  66 #define PAI_VERSION_OFFSET      0
  67 #define PAI_FLAG_OFFSET         1
  68 #define PAI_NUM_ENTRIES_OFFSET  2
  69 #define PAI_NUM_DEFAULT_ENTRIES_OFFSET  4
  70 #define PAI_ENTRIES_BASE        6
  71
  72 #define PAI_VERSION             1
  73 #define PAI_ACL_FLAG_PROTECTED  0x1
  74 #define PAI_ENTRY_LENGTH        5
  75
  76 /*
  77  * In memory format of user.SAMBA_PAI attribute.
  78  */
  79
  80 struct pai_entry {
  81         struct pai_entry *next, *prev;
  82         enum ace_owner owner_type;
  83         posix_id unix_ug;
  84 };
  85
  86 struct pai_val {
  87         BOOL pai_protected;
  88         unsigned int num_entries;
  89         struct pai_entry *entry_list;
  90         unsigned int num_def_entries;
  91         struct pai_entry *def_entry_list;
  92 };
  93
  94 /************************************************************************
  95  Return a uint32 of the pai_entry principal.
  96 ************************************************************************/
  97
  98 static uint32 get_pai_entry_val(struct pai_entry *paie)
  99 {
 100         switch (paie->owner_type) {
 101                 case UID_ACE:
 102                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 103                         return (uint32)paie->unix_ug.uid;
 104                 case GID_ACE:
 105                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 106                         return (uint32)paie->unix_ug.gid;
 107                 case WORLD_ACE:
 108                 default:
 109                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 110                         return (uint32)-1;
 111         }
 112 }
 113
 114 /************************************************************************
 115  Return a uint32 of the entry principal.
 116 ************************************************************************/
 117
 118 static uint32 get_entry_val(canon_ace *ace_entry)
 119 {
 120         switch (ace_entry->owner_type) {
 121                 case UID_ACE:
 122                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
 123                         return (uint32)ace_entry->unix_ug.uid;
 124                 case GID_ACE:
 125                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
 126                         return (uint32)ace_entry->unix_ug.gid;
 127                 case WORLD_ACE:
 128                 default:
 129                         DEBUG(10,("get_entry_val: world ace\n"));
 130                         return (uint32)-1;
 131         }
 132 }
 133
 134 /************************************************************************
 135  Count the inherited entries.
 136 ************************************************************************/
 137
 138 static unsigned int num_inherited_entries(canon_ace *ace_list)
 139 {
 140         unsigned int num_entries = 0;
 141
 142         for (; ace_list; ace_list = ace_list->next)
 143                 if (ace_list->inherited)
 144                         num_entries++;
 145         return num_entries;
 146 }
 147
 148 /************************************************************************
 149  Create the on-disk format. Caller must free.
 150 ************************************************************************/
 151
 152 static char *create_pai_buf(canon_ace *file_ace_list, canon_ace *dir_ace_list, BOOL pai_protected, size_t *store_size)
 153 {
 154         char *pai_buf = NULL;
 155         canon_ace *ace_list = NULL;
 156         char *entry_offset = NULL;
 157         unsigned int num_entries = 0;
 158         unsigned int num_def_entries = 0;
 159
 160         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next)
 161                 if (ace_list->inherited)
 162                         num_entries++;
 163
 164         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next)
 165                 if (ace_list->inherited)
 166                         num_def_entries++;
 167
 168         DEBUG(10,("create_pai_buf: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 169
 170         *store_size = PAI_ENTRIES_BASE + ((num_entries + num_def_entries)*PAI_ENTRY_LENGTH);
 171
 172         pai_buf = (char *)SMB_MALLOC(*store_size);
 173         if (!pai_buf) {
 174                 return NULL;
 175         }
 176
 177         /* Set up the header. */
 178         memset(pai_buf, '\0', PAI_ENTRIES_BASE);
 179         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_VERSION);
 180         SCVAL(pai_buf,PAI_FLAG_OFFSET,(pai_protected ? PAI_ACL_FLAG_PROTECTED : 0));
 181         SSVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET,num_entries);
 182         SSVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 183
 184         entry_offset = pai_buf + PAI_ENTRIES_BASE;
 185
 186         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 187                 if (ace_list->inherited) {
 188                         uint8 type_val = (unsigned char)ace_list->owner_type;
 189                         uint32 entry_val = get_entry_val(ace_list);
 190
 191                         SCVAL(entry_offset,0,type_val);
 192                         SIVAL(entry_offset,1,entry_val);
 193                         entry_offset += PAI_ENTRY_LENGTH;
 194                 }
 195         }
 196
 197         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 198                 if (ace_list->inherited) {
 199                         uint8 type_val = (unsigned char)ace_list->owner_type;
 200                         uint32 entry_val = get_entry_val(ace_list);
 201
 202                         SCVAL(entry_offset,0,type_val);
 203                         SIVAL(entry_offset,1,entry_val);
 204                         entry_offset += PAI_ENTRY_LENGTH;
 205                 }
 206         }
 207
 208         return pai_buf;
 209 }
 210
 211 /************************************************************************
 212  Store the user.SAMBA_PAI attribute on disk.
 213 ************************************************************************/
 214
 215 static void store_inheritance_attributes(files_struct *fsp, canon_ace *file_ace_list,
 216                                         canon_ace *dir_ace_list, BOOL pai_protected)
 217 {
 218         int ret;
 219         size_t store_size;
 220         char *pai_buf;
 221
 222         if (!lp_map_acl_inherit(SNUM(fsp->conn)))
 223                 return;
 224
 225         /*
 226          * Don't store if this ACL isn't protected and
 227          * none of the entries in it are marked as inherited.
 228          */
 229
 230         if (!pai_protected && num_inherited_entries(file_ace_list) == 0 && num_inherited_entries(dir_ace_list) == 0) {
 231                 /* Instead just remove the attribute if it exists. */
 232                 if (fsp->fh->fd != -1)
 233                         SMB_VFS_FREMOVEXATTR(fsp, fsp->fh->fd, SAMBA_POSIX_INHERITANCE_EA_NAME);
 234                 else
 235                         SMB_VFS_REMOVEXATTR(fsp->conn, fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME);
 236                 return;
 237         }
 238
 239         pai_buf = create_pai_buf(file_ace_list, dir_ace_list, pai_protected, &store_size);
 240
 241         if (fsp->fh->fd != -1)
 242                 ret = SMB_VFS_FSETXATTR(fsp, fsp->fh->fd, SAMBA_POSIX_INHERITANCE_EA_NAME,
 243                                 pai_buf, store_size, 0);
 244         else
 245                 ret = SMB_VFS_SETXATTR(fsp->conn,fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME,
 246                                 pai_buf, store_size, 0);
 247
 248         SAFE_FREE(pai_buf);
 249
 250         DEBUG(10,("store_inheritance_attribute:%s for file %s\n", pai_protected ? " (protected)" : "", fsp->fsp_name));
 251         if (ret == -1 && !no_acl_syscall_error(errno))
 252                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 253 }
 254
 255 /************************************************************************
 256  Delete the in memory inheritance info.
 257 ************************************************************************/
 258
 259 static void free_inherited_info(struct pai_val *pal)
 260 {
 261         if (pal) {
 262                 struct pai_entry *paie, *paie_next;
 263                 for (paie = pal->entry_list; paie; paie = paie_next) {
 264                         paie_next = paie->next;
 265                         SAFE_FREE(paie);
 266                 }
 267                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 268                         paie_next = paie->next;
 269                         SAFE_FREE(paie);
 270                 }
 271                 SAFE_FREE(pal);
 272         }
 273 }
 274
 275 /************************************************************************
 276  Was this ACL protected ?
 277 ************************************************************************/
 278
 279 static BOOL get_protected_flag(struct pai_val *pal)
 280 {
 281         if (!pal)
 282                 return False;
 283         return pal->pai_protected;
 284 }
 285
 286 /************************************************************************
 287  Was this ACE inherited ?
 288 ************************************************************************/
 289
 290 static BOOL get_inherited_flag(struct pai_val *pal, canon_ace *ace_entry, BOOL default_ace)
 291 {
 292         struct pai_entry *paie;
 293
 294         if (!pal)
 295                 return False;
 296
 297         /* If the entry exists it is inherited. */
 298         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 299                 if (ace_entry->owner_type == paie->owner_type &&
 300                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 301                         return True;
 302         }
 303         return False;
 304 }
 305
 306 /************************************************************************
 307  Ensure an attribute just read is valid.
 308 ************************************************************************/
 309
 310 static BOOL check_pai_ok(char *pai_buf, size_t pai_buf_data_size)
 311 {
 312         uint16 num_entries;
 313         uint16 num_def_entries;
 314
 315         if (pai_buf_data_size < PAI_ENTRIES_BASE) {
 316                 /* Corrupted - too small. */
 317                 return False;
 318         }
 319
 320         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_VERSION)
 321                 return False;
 322
 323         num_entries = SVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET);
 324         num_def_entries = SVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
 325
 326         /* Check the entry lists match. */
 327         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 328
 329         if (((num_entries + num_def_entries)*PAI_ENTRY_LENGTH) + PAI_ENTRIES_BASE != pai_buf_data_size)
 330                 return False;
 331
 332         return True;
 333 }
 334
 335
 336 /************************************************************************
 337  Convert to in-memory format.
 338 ************************************************************************/
 339
 340 static struct pai_val *create_pai_val(char *buf, size_t size)
 341 {
 342         char *entry_offset;
 343         struct pai_val *paiv = NULL;
 344         int i;
 345
 346         if (!check_pai_ok(buf, size))
 347                 return NULL;
 348
 349         paiv = SMB_MALLOC_P(struct pai_val);
 350         if (!paiv)
 351                 return NULL;
 352
 353         memset(paiv, '\0', sizeof(struct pai_val));
 354
 355         paiv->pai_protected = (CVAL(buf,PAI_FLAG_OFFSET) == PAI_ACL_FLAG_PROTECTED);
 356
 357         paiv->num_entries = SVAL(buf,PAI_NUM_ENTRIES_OFFSET);
 358         paiv->num_def_entries = SVAL(buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
 359
 360         entry_offset = buf + PAI_ENTRIES_BASE;
 361
 362         DEBUG(10,("create_pai_val:%s num_entries = %u, num_def_entries = %u\n",
 363                         paiv->pai_protected ? " (pai_protected)" : "", paiv->num_entries, paiv->num_def_entries ));
 364
 365         for (i = 0; i < paiv->num_entries; i++) {
 366                 struct pai_entry *paie;
 367
 368                 paie = SMB_MALLOC_P(struct pai_entry);
 369                 if (!paie) {
 370                         free_inherited_info(paiv);
 371                         return NULL;
 372                 }
 373
 374                 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 375                 switch( paie->owner_type) {
 376                         case UID_ACE:
 377                                 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 378                                 DEBUG(10,("create_pai_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 379                                 break;
 380                         case GID_ACE:
 381                                 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 382                                 DEBUG(10,("create_pai_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 383                                 break;
 384                         case WORLD_ACE:
 385                                 paie->unix_ug.world = -1;
 386                                 DEBUG(10,("create_pai_val: world ace\n"));
 387                                 break;
 388                         default:
 389                                 free_inherited_info(paiv);
 390                                 return NULL;
 391                 }
 392                 entry_offset += PAI_ENTRY_LENGTH;
 393                 DLIST_ADD(paiv->entry_list, paie);
 394         }
 395
 396         for (i = 0; i < paiv->num_def_entries; i++) {
 397                 struct pai_entry *paie;
 398
 399                 paie = SMB_MALLOC_P(struct pai_entry);
 400                 if (!paie) {
 401                         free_inherited_info(paiv);
 402                         return NULL;
 403                 }
 404
 405                 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 406                 switch( paie->owner_type) {
 407                         case UID_ACE:
 408                                 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 409                                 DEBUG(10,("create_pai_val: (def) uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 410                                 break;
 411                         case GID_ACE:
 412                                 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 413                                 DEBUG(10,("create_pai_val: (def) gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 414                                 break;
 415                         case WORLD_ACE:
 416                                 paie->unix_ug.world = -1;
 417                                 DEBUG(10,("create_pai_val: (def) world ace\n"));
 418                                 break;
 419                         default:
 420                                 free_inherited_info(paiv);
 421                                 return NULL;
 422                 }
 423                 entry_offset += PAI_ENTRY_LENGTH;
 424                 DLIST_ADD(paiv->def_entry_list, paie);
 425         }
 426
 427         return paiv;
 428 }
 429
 430 /************************************************************************
 431  Load the user.SAMBA_PAI attribute.
 432 ************************************************************************/
 433
 434 static struct pai_val *load_inherited_info(files_struct *fsp)
 435 {
 436         char *pai_buf;
 437         size_t pai_buf_size = 1024;
 438         struct pai_val *paiv = NULL;
 439         ssize_t ret;
 440
 441         if (!lp_map_acl_inherit(SNUM(fsp->conn)))
 442                 return NULL;
 443
 444         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 445                 return NULL;
 446
 447         do {
 448                 if (fsp->fh->fd != -1)
 449                         ret = SMB_VFS_FGETXATTR(fsp, fsp->fh->fd, SAMBA_POSIX_INHERITANCE_EA_NAME,
 450                                         pai_buf, pai_buf_size);
 451                 else
 452                         ret = SMB_VFS_GETXATTR(fsp->conn,fsp->fsp_name,SAMBA_POSIX_INHERITANCE_EA_NAME,
 453                                         pai_buf, pai_buf_size);
 454
 455                 if (ret == -1) {
 456                         if (errno != ERANGE) {
 457                                 break;
 458                         }
 459                         /* Buffer too small - enlarge it. */
 460                         pai_buf_size *= 2;
 461                         SAFE_FREE(pai_buf);
 462                         if (pai_buf_size > 1024*1024) {
 463                                 return NULL; /* Limit malloc to 1mb. */
 464                         }
 465                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 466                                 return NULL;
 467                 }
 468         } while (ret == -1);
 469
 470         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fsp->fsp_name));
 471
 472         if (ret == -1) {
 473                 /* No attribute or not supported. */
 474 #if defined(ENOATTR)
 475                 if (errno != ENOATTR)
 476                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 477 #else
 478                 if (errno != ENOSYS)
 479                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 480 #endif
 481                 SAFE_FREE(pai_buf);
 482                 return NULL;
 483         }
 484
 485         paiv = create_pai_val(pai_buf, ret);
 486
 487         if (paiv && paiv->pai_protected)
 488                 DEBUG(10,("load_inherited_info: ACL is protected for file %s\n", fsp->fsp_name));
 489
 490         SAFE_FREE(pai_buf);
 491         return paiv;
 492 }
 493
 494 /****************************************************************************
 495  Functions to manipulate the internal ACE format.
 496 ****************************************************************************/
 497
 498 /****************************************************************************
 499  Count a linked list of canonical ACE entries.
 500 ****************************************************************************/
 501
 502 static size_t count_canon_ace_list( canon_ace *list_head )
 503 {
 504         size_t count = 0;
 505         canon_ace *ace;
 506
 507         for (ace = list_head; ace; ace = ace->next)
 508                 count++;
 509
 510         return count;
 511 }
 512
 513 /****************************************************************************
 514  Free a linked list of canonical ACE entries.
 515 ****************************************************************************/
 516
 517 static void free_canon_ace_list( canon_ace *list_head )
 518 {
 519         canon_ace *list, *next;
 520
 521         for (list = list_head; list; list = next) {
 522                 next = list->next;
 523                 DLIST_REMOVE(list_head, list);
 524                 SAFE_FREE(list);
 525         }
 526 }
 527
 528 /****************************************************************************
 529  Function to duplicate a canon_ace entry.
 530 ****************************************************************************/
 531
 532 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 533 {
 534         canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
 535
 536         if (dst_ace == NULL)
 537                 return NULL;
 538
 539         *dst_ace = *src_ace;
 540         dst_ace->prev = dst_ace->next = NULL;
 541         return dst_ace;
 542 }
 543
 544 /****************************************************************************
 545  Print out a canon ace.
 546 ****************************************************************************/
 547
 548 static void print_canon_ace(canon_ace *pace, int num)
 549 {
 550         fstring str;
 551
 552         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 553         dbgtext( "SID = %s ", sid_to_string( str, &pace->trustee));
 554         if (pace->owner_type == UID_ACE) {
 555                 const char *u_name = uidtoname(pace->unix_ug.uid);
 556                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
 557         } else if (pace->owner_type == GID_ACE) {
 558                 char *g_name = gidtoname(pace->unix_ug.gid);
 559                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
 560         } else
 561                 dbgtext( "other ");
 562         switch (pace->type) {
 563                 case SMB_ACL_USER:
 564                         dbgtext( "SMB_ACL_USER ");
 565                         break;
 566                 case SMB_ACL_USER_OBJ:
 567                         dbgtext( "SMB_ACL_USER_OBJ ");
 568                         break;
 569                 case SMB_ACL_GROUP:
 570                         dbgtext( "SMB_ACL_GROUP ");
 571                         break;
 572                 case SMB_ACL_GROUP_OBJ:
 573                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 574                         break;
 575                 case SMB_ACL_OTHER:
 576                         dbgtext( "SMB_ACL_OTHER ");
 577                         break;
 578                 default:
 579                         dbgtext( "MASK " );
 580                         break;
 581         }
 582         if (pace->inherited)
 583                 dbgtext( "(inherited) ");
 584         dbgtext( "perms ");
 585         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 586         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 587         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 588 }
 589
 590 /****************************************************************************
 591  Print out a canon ace list.
 592 ****************************************************************************/
 593
 594 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 595 {
 596         int count = 0;
 597
 598         if( DEBUGLVL( 10 )) {
 599                 dbgtext( "print_canon_ace_list: %s\n", name );
 600                 for (;ace_list; ace_list = ace_list->next, count++)
 601                         print_canon_ace(ace_list, count );
 602         }
 603 }
 604
 605 /****************************************************************************
 606  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 607 ****************************************************************************/
 608
 609 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
 610 {
 611         mode_t ret = 0;
 612
 613         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
 614         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 615         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 616
 617         return ret;
 618 }
 619
 620 /****************************************************************************
 621  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 622 ****************************************************************************/
 623
 624 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 625 {
 626         mode_t ret = 0;
 627
 628         if (mode & r_mask)
 629                 ret |= S_IRUSR;
 630         if (mode & w_mask)
 631                 ret |= S_IWUSR;
 632         if (mode & x_mask)
 633                 ret |= S_IXUSR;
 634
 635         return ret;
 636 }
 637
 638 /****************************************************************************
 639  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 640  an SMB_ACL_PERMSET_T.
 641 ****************************************************************************/
 642
 643 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 644 {
 645         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1)
 646                 return -1;
 647         if (mode & S_IRUSR) {
 648                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
 649                         return -1;
 650         }
 651         if (mode & S_IWUSR) {
 652                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
 653                         return -1;
 654         }
 655         if (mode & S_IXUSR) {
 656                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
 657                         return -1;
 658         }
 659         return 0;
 660 }
 661
 662 /****************************************************************************
 663  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 664 ****************************************************************************/
 665
 666 static void create_file_sids(SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
 667 {
 668         uid_to_sid( powner_sid, psbuf->st_uid );
 669         gid_to_sid( pgroup_sid, psbuf->st_gid );
 670 }
 671
 672 /****************************************************************************
 673  Is the identity in two ACEs equal ? Check both SID and uid/gid.
 674 ****************************************************************************/
 675
 676 static BOOL identity_in_ace_equal(canon_ace *ace1, canon_ace *ace2)
 677 {
 678         if (sid_equal(&ace1->trustee, &ace2->trustee)) {
 679                 return True;
 680         }
 681         if (ace1->owner_type == ace2->owner_type) {
 682                 if (ace1->owner_type == UID_ACE &&
 683                                 ace1->unix_ug.uid == ace2->unix_ug.uid) {
 684                         return True;
 685                 } else if (ace1->owner_type == GID_ACE &&
 686                                 ace1->unix_ug.gid == ace2->unix_ug.gid) {
 687                         return True;
 688                 }
 689         }
 690         return False;
 691 }
 692
 693 /****************************************************************************
 694  Merge aces with a common sid - if both are allow or deny, OR the permissions together and
 695  delete the second one. If the first is deny, mask the permissions off and delete the allow
 696  if the permissions become zero, delete the deny if the permissions are non zero.
 697 ****************************************************************************/
 698
 699 static void merge_aces( canon_ace **pp_list_head )
 700 {
 701         canon_ace *list_head = *pp_list_head;
 702         canon_ace *curr_ace_outer;
 703         canon_ace *curr_ace_outer_next;
 704
 705         /*
 706          * First, merge allow entries with identical SIDs, and deny entries
 707          * with identical SIDs.
 708          */
 709
 710         for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 711                 canon_ace *curr_ace;
 712                 canon_ace *curr_ace_next;
 713
 714                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 715
 716                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 717
 718                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 719
 720                         if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
 721                                 (curr_ace->attr == curr_ace_outer->attr)) {
 722
 723                                 if( DEBUGLVL( 10 )) {
 724                                         dbgtext("merge_aces: Merging ACE's\n");
 725                                         print_canon_ace( curr_ace_outer, 0);
 726                                         print_canon_ace( curr_ace, 0);
 727                                 }
 728
 729                                 /* Merge two allow or two deny ACE's. */
 730
 731                                 curr_ace_outer->perms |= curr_ace->perms;
 732                                 DLIST_REMOVE(list_head, curr_ace);
 733                                 SAFE_FREE(curr_ace);
 734                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 735                         }
 736                 }
 737         }
 738
 739         /*
 740          * Now go through and mask off allow permissions with deny permissions.
 741          * We can delete either the allow or deny here as we know that each SID
 742          * appears only once in the list.
 743          */
 744
 745         for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 746                 canon_ace *curr_ace;
 747                 canon_ace *curr_ace_next;
 748
 749                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 750
 751                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 752
 753                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 754
 755                         /*
 756                          * Subtract ACE's with different entries. Due to the ordering constraints
 757                          * we've put on the ACL, we know the deny must be the first one.
 758                          */
 759
 760                         if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
 761                                 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
 762
 763                                 if( DEBUGLVL( 10 )) {
 764                                         dbgtext("merge_aces: Masking ACE's\n");
 765                                         print_canon_ace( curr_ace_outer, 0);
 766                                         print_canon_ace( curr_ace, 0);
 767                                 }
 768
 769                                 curr_ace->perms &= ~curr_ace_outer->perms;
 770
 771                                 if (curr_ace->perms == 0) {
 772
 773                                         /*
 774                                          * The deny overrides the allow. Remove the allow.
 775                                          */
 776
 777                                         DLIST_REMOVE(list_head, curr_ace);
 778                                         SAFE_FREE(curr_ace);
 779                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 780
 781                                 } else {
 782
 783                                         /*
 784                                          * Even after removing permissions, there
 785                                          * are still allow permissions - delete the deny.
 786                                          * It is safe to delete the deny here,
 787                                          * as we are guarenteed by the deny first
 788                                          * ordering that all the deny entries for
 789                                          * this SID have already been merged into one
 790                                          * before we can get to an allow ace.
 791                                          */
 792
 793                                         DLIST_REMOVE(list_head, curr_ace_outer);
 794                                         SAFE_FREE(curr_ace_outer);
 795                                         break;
 796                                 }
 797                         }
 798
 799                 } /* end for curr_ace */
 800         } /* end for curr_ace_outer */
 801
 802         /* We may have modified the list. */
 803
 804         *pp_list_head = list_head;
 805 }
 806
 807 /****************************************************************************
 808  Check if we need to return NT4.x compatible ACL entries.
 809 ****************************************************************************/
 810
 811 static BOOL nt4_compatible_acls(void)
 812 {
 813         int compat = lp_acl_compatibility();
 814
 815         if (compat == ACL_COMPAT_AUTO) {
 816                 enum remote_arch_types ra_type = get_remote_arch();
 817
 818                 /* Automatically adapt to client */
 819                 return (ra_type <= RA_WINNT);
 820         } else
 821                 return (compat == ACL_COMPAT_WINNT);
 822 }
 823
 824
 825 /****************************************************************************
 826  Map canon_ace perms to permission bits NT.
 827  The attr element is not used here - we only process deny entries on set,
 828  not get. Deny entries are implicit on get with ace->perms = 0.
 829 ****************************************************************************/
 830
 831 static SEC_ACCESS map_canon_ace_perms(int snum,
 832                                 int *pacl_type,
 833                                 mode_t perms,
 834                                 BOOL directory_ace)
 835 {
 836         SEC_ACCESS sa;
 837         uint32 nt_mask = 0;
 838
 839         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
 840
 841         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
 842                 if (directory_ace) {
 843                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
 844                 } else {
 845                         nt_mask = UNIX_ACCESS_RWX;
 846                 }
 847         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
 848                 /*
 849                  * Windows NT refuses to display ACEs with no permissions in them (but
 850                  * they are perfectly legal with Windows 2000). If the ACE has empty
 851                  * permissions we cannot use 0, so we use the otherwise unused
 852                  * WRITE_OWNER permission, which we ignore when we set an ACL.
 853                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
 854                  * to be changed in the future.
 855                  */
 856
 857                 if (nt4_compatible_acls())
 858                         nt_mask = UNIX_ACCESS_NONE;
 859                 else
 860                         nt_mask = 0;
 861         } else {
 862                 if (directory_ace) {
 863                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
 864                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
 865                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
 866                 } else {
 867                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
 868                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
 869                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
 870                 }
 871         }
 872
 873         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
 874                         (unsigned int)perms, (unsigned int)nt_mask ));
 875
 876         init_sec_access(&sa,nt_mask);
 877         return sa;
 878 }
 879
 880 /****************************************************************************
 881  Map NT perms to a UNIX mode_t.
 882 ****************************************************************************/
 883
 884 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
 885 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
 886 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
 887
 888 static mode_t map_nt_perms( uint32 *mask, int type)
 889 {
 890         mode_t mode = 0;
 891
 892         switch(type) {
 893         case S_IRUSR:
 894                 if((*mask) & GENERIC_ALL_ACCESS)
 895                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
 896                 else {
 897                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
 898                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
 899                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
 900                 }
 901                 break;
 902         case S_IRGRP:
 903                 if((*mask) & GENERIC_ALL_ACCESS)
 904                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
 905                 else {
 906                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
 907                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
 908                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
 909                 }
 910                 break;
 911         case S_IROTH:
 912                 if((*mask) & GENERIC_ALL_ACCESS)
 913                         mode = S_IROTH|S_IWOTH|S_IXOTH;
 914                 else {
 915                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
 916                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
 917                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
 918                 }
 919                 break;
 920         }
 921
 922         return mode;
 923 }
 924
 925 /****************************************************************************
 926  Unpack a SEC_DESC into a UNIX owner and group.
 927 ****************************************************************************/
 928
 929 BOOL unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, SEC_DESC *psd)
 930 {
 931         DOM_SID owner_sid;
 932         DOM_SID grp_sid;
 933
 934         *puser = (uid_t)-1;
 935         *pgrp = (gid_t)-1;
 936
 937         if(security_info_sent == 0) {
 938                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
 939                 return True;
 940         }
 941
 942         /*
 943          * Validate the owner and group SID's.
 944          */
 945
 946         memset(&owner_sid, '\0', sizeof(owner_sid));
 947         memset(&grp_sid, '\0', sizeof(grp_sid));
 948
 949         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
 950
 951         /*
 952          * Don't immediately fail if the owner sid cannot be validated.
 953          * This may be a group chown only set.
 954          */
 955
 956         if (security_info_sent & OWNER_SECURITY_INFORMATION) {
 957                 sid_copy(&owner_sid, psd->owner_sid);
 958                 if (!sid_to_uid(&owner_sid, puser)) {
 959                         if (lp_force_unknown_acl_user(snum)) {
 960                                 /* this allows take ownership to work
 961                                  * reasonably */
 962                                 *puser = current_user.ut.uid;
 963                         } else {
 964                                 DEBUG(3,("unpack_nt_owners: unable to validate"
 965                                          " owner sid for %s\n",
 966                                          sid_string_static(&owner_sid)));
 967                                 return False;
 968                         }
 969                 }
 970         }
 971
 972         /*
 973          * Don't immediately fail if the group sid cannot be validated.
 974          * This may be an owner chown only set.
 975          */
 976
 977         if (security_info_sent & GROUP_SECURITY_INFORMATION) {
 978                 sid_copy(&grp_sid, psd->group_sid);
 979                 if (!sid_to_gid( &grp_sid, pgrp)) {
 980                         if (lp_force_unknown_acl_user(snum)) {
 981                                 /* this allows take group ownership to work
 982                                  * reasonably */
 983                                 *pgrp = current_user.ut.gid;
 984                         } else {
 985                                 DEBUG(3,("unpack_nt_owners: unable to validate"
 986                                          " group sid.\n"));
 987                                 return False;
 988                         }
 989                 }
 990         }
 991
 992         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
 993
 994         return True;
 995 }
 996
 997 /****************************************************************************
 998  Ensure the enforced permissions for this share apply.
 999 ****************************************************************************/
1000
1001 static void apply_default_perms(files_struct *fsp, canon_ace *pace, mode_t type)
1002 {
1003         int snum = SNUM(fsp->conn);
1004         mode_t and_bits = (mode_t)0;
1005         mode_t or_bits = (mode_t)0;
1006
1007         /* Get the initial bits to apply. */
1008
1009         if (fsp->is_directory) {
1010                 and_bits = lp_dir_security_mask(snum);
1011                 or_bits = lp_force_dir_security_mode(snum);
1012         } else {
1013                 and_bits = lp_security_mask(snum);
1014                 or_bits = lp_force_security_mode(snum);
1015         }
1016
1017         /* Now bounce them into the S_USR space. */
1018         switch(type) {
1019         case S_IRUSR:
1020                 /* Ensure owner has read access. */
1021                 pace->perms |= S_IRUSR;
1022                 if (fsp->is_directory)
1023                         pace->perms |= (S_IWUSR|S_IXUSR);
1024                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1025                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1026                 break;
1027         case S_IRGRP:
1028                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1029                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1030                 break;
1031         case S_IROTH:
1032                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1033                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1034                 break;
1035         }
1036
1037         pace->perms = ((pace->perms & and_bits)|or_bits);
1038 }
1039
1040 /****************************************************************************
1041  Check if a given uid/SID is in a group gid/SID. This is probably very
1042  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1043 ****************************************************************************/
1044
1045 static BOOL uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1046 {
1047         fstring u_name;
1048
1049         /* "Everyone" always matches every uid. */
1050
1051         if (sid_equal(&group_ace->trustee, &global_sid_World))
1052                 return True;
1053
1054         /* Assume that the current user is in the current group (force group) */
1055
1056         if (uid_ace->unix_ug.uid == current_user.ut.uid && group_ace->unix_ug.gid == current_user.ut.gid)
1057                 return True;
1058
1059         fstrcpy(u_name, uidtoname(uid_ace->unix_ug.uid));
1060         return user_in_group_sid(u_name, &group_ace->trustee);
1061 }
1062
1063 /****************************************************************************
1064  A well formed POSIX file or default ACL has at least 3 entries, a
1065  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1066  In addition, the owner must always have at least read access.
1067  When using this call on get_acl, the pst struct is valid and contains
1068  the mode of the file. When using this call on set_acl, the pst struct has
1069  been modified to have a mode containing the default for this file or directory
1070  type.
1071 ****************************************************************************/
1072
1073 static BOOL ensure_canon_entry_valid(canon_ace **pp_ace,
1074                                                         files_struct *fsp,
1075                                                         const DOM_SID *pfile_owner_sid,
1076                                                         const DOM_SID *pfile_grp_sid,
1077                                                         SMB_STRUCT_STAT *pst,
1078                                                         BOOL setting_acl)
1079 {
1080         canon_ace *pace;
1081         BOOL got_user = False;
1082         BOOL got_grp = False;
1083         BOOL got_other = False;
1084         canon_ace *pace_other = NULL;
1085
1086         for (pace = *pp_ace; pace; pace = pace->next) {
1087                 if (pace->type == SMB_ACL_USER_OBJ) {
1088
1089                         if (setting_acl)
1090                                 apply_default_perms(fsp, pace, S_IRUSR);
1091                         got_user = True;
1092
1093                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1094
1095                         /*
1096                          * Ensure create mask/force create mode is respected on set.
1097                          */
1098
1099                         if (setting_acl)
1100                                 apply_default_perms(fsp, pace, S_IRGRP);
1101                         got_grp = True;
1102
1103                 } else if (pace->type == SMB_ACL_OTHER) {
1104
1105                         /*
1106                          * Ensure create mask/force create mode is respected on set.
1107                          */
1108
1109                         if (setting_acl)
1110                                 apply_default_perms(fsp, pace, S_IROTH);
1111                         got_other = True;
1112                         pace_other = pace;
1113                 }
1114         }
1115
1116         if (!got_user) {
1117                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1118                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1119                         return False;
1120                 }
1121
1122                 ZERO_STRUCTP(pace);
1123                 pace->type = SMB_ACL_USER_OBJ;
1124                 pace->owner_type = UID_ACE;
1125                 pace->unix_ug.uid = pst->st_uid;
1126                 pace->trustee = *pfile_owner_sid;
1127                 pace->attr = ALLOW_ACE;
1128
1129                 if (setting_acl) {
1130                         /* See if the owning user is in any of the other groups in
1131                            the ACE. If so, OR in the permissions from that group. */
1132
1133                         BOOL group_matched = False;
1134                         canon_ace *pace_iter;
1135
1136                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1137                                 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1138                                         if (uid_entry_in_group(pace, pace_iter)) {
1139                                                 pace->perms |= pace_iter->perms;
1140                                                 group_matched = True;
1141                                         }
1142                                 }
1143                         }
1144
1145                         /* If we only got an "everyone" perm, just use that. */
1146                         if (!group_matched) {
1147                                 if (got_other)
1148                                         pace->perms = pace_other->perms;
1149                                 else
1150                                         pace->perms = 0;
1151                         }
1152
1153                         apply_default_perms(fsp, pace, S_IRUSR);
1154                 } else {
1155                         pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1156                 }
1157
1158                 DLIST_ADD(*pp_ace, pace);
1159         }
1160
1161         if (!got_grp) {
1162                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1163                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1164                         return False;
1165                 }
1166
1167                 ZERO_STRUCTP(pace);
1168                 pace->type = SMB_ACL_GROUP_OBJ;
1169                 pace->owner_type = GID_ACE;
1170                 pace->unix_ug.uid = pst->st_gid;
1171                 pace->trustee = *pfile_grp_sid;
1172                 pace->attr = ALLOW_ACE;
1173                 if (setting_acl) {
1174                         /* If we only got an "everyone" perm, just use that. */
1175                         if (got_other)
1176                                 pace->perms = pace_other->perms;
1177                         else
1178                                 pace->perms = 0;
1179                         apply_default_perms(fsp, pace, S_IRGRP);
1180                 } else {
1181                         pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1182                 }
1183
1184                 DLIST_ADD(*pp_ace, pace);
1185         }
1186
1187         if (!got_other) {
1188                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1189                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1190                         return False;
1191                 }
1192
1193                 ZERO_STRUCTP(pace);
1194                 pace->type = SMB_ACL_OTHER;
1195                 pace->owner_type = WORLD_ACE;
1196                 pace->unix_ug.world = -1;
1197                 pace->trustee = global_sid_World;
1198                 pace->attr = ALLOW_ACE;
1199                 if (setting_acl) {
1200                         pace->perms = 0;
1201                         apply_default_perms(fsp, pace, S_IROTH);
1202                 } else
1203                         pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
1204
1205                 DLIST_ADD(*pp_ace, pace);
1206         }
1207
1208         return True;
1209 }
1210
1211 /****************************************************************************
1212  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1213  If it does not have them, check if there are any entries where the trustee is the
1214  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1215 ****************************************************************************/
1216
1217 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1218 {
1219         BOOL got_user_obj, got_group_obj;
1220         canon_ace *current_ace;
1221         int i, entries;
1222
1223         entries = count_canon_ace_list(ace);
1224         got_user_obj = False;
1225         got_group_obj = False;
1226
1227         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1228                 if (current_ace->type == SMB_ACL_USER_OBJ)
1229                         got_user_obj = True;
1230                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1231                         got_group_obj = True;
1232         }
1233         if (got_user_obj && got_group_obj) {
1234                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1235                 return;
1236         }
1237
1238         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1239                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1240                                 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1241                         current_ace->type = SMB_ACL_USER_OBJ;
1242                         got_user_obj = True;
1243                 }
1244                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1245                                 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1246                         current_ace->type = SMB_ACL_GROUP_OBJ;
1247                         got_group_obj = True;
1248                 }
1249         }
1250         if (!got_user_obj)
1251                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1252         if (!got_group_obj)
1253                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1254 }
1255
1256 /****************************************************************************
1257  Unpack a SEC_DESC into two canonical ace lists.
1258 ****************************************************************************/
1259
1260 static BOOL create_canon_ace_lists(files_struct *fsp, SMB_STRUCT_STAT *pst,
1261                                                         DOM_SID *pfile_owner_sid,
1262                                                         DOM_SID *pfile_grp_sid,
1263                                                         canon_ace **ppfile_ace, canon_ace **ppdir_ace,
1264                                                         SEC_ACL *dacl)
1265 {
1266         BOOL all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1267         canon_ace *file_ace = NULL;
1268         canon_ace *dir_ace = NULL;
1269         canon_ace *current_ace = NULL;
1270         BOOL got_dir_allow = False;
1271         BOOL got_file_allow = False;
1272         int i, j;
1273
1274         *ppfile_ace = NULL;
1275         *ppdir_ace = NULL;
1276
1277         /*
1278          * Convert the incoming ACL into a more regular form.
1279          */
1280
1281         for(i = 0; i < dacl->num_aces; i++) {
1282                 SEC_ACE *psa = &dacl->aces[i];
1283
1284                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1285                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1286                         return False;
1287                 }
1288
1289                 if (nt4_compatible_acls()) {
1290                         /*
1291                          * The security mask may be UNIX_ACCESS_NONE which should map into
1292                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1293                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1294                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1295                          */
1296
1297                         /*
1298                          * Convert GENERIC bits to specific bits.
1299                          */
1300
1301                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1302
1303                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1304
1305                         if(psa->access_mask != UNIX_ACCESS_NONE)
1306                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1307                 }
1308         }
1309
1310         /*
1311          * Deal with the fact that NT 4.x re-writes the canonical format
1312          * that we return for default ACLs. If a directory ACE is identical
1313          * to a inherited directory ACE then NT changes the bits so that the
1314          * first ACE is set to OI|IO and the second ACE for this SID is set
1315          * to CI. We need to repair this. JRA.
1316          */
1317
1318         for(i = 0; i < dacl->num_aces; i++) {
1319                 SEC_ACE *psa1 = &dacl->aces[i];
1320
1321                 for (j = i + 1; j < dacl->num_aces; j++) {
1322                         SEC_ACE *psa2 = &dacl->aces[j];
1323
1324                         if (psa1->access_mask != psa2->access_mask)
1325                                 continue;
1326
1327                         if (!sid_equal(&psa1->trustee, &psa2->trustee))
1328                                 continue;
1329
1330                         /*
1331                          * Ok - permission bits and SIDs are equal.
1332                          * Check if flags were re-written.
1333                          */
1334
1335                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1336
1337                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1338                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1339
1340                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1341
1342                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1343                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1344
1345                         }
1346                 }
1347         }
1348
1349         for(i = 0; i < dacl->num_aces; i++) {
1350                 SEC_ACE *psa = &dacl->aces[i];
1351
1352                 /*
1353                  * Create a cannon_ace entry representing this NT DACL ACE.
1354                  */
1355
1356                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1357                         free_canon_ace_list(file_ace);
1358                         free_canon_ace_list(dir_ace);
1359                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1360                         return False;
1361                 }
1362
1363                 ZERO_STRUCTP(current_ace);
1364
1365                 sid_copy(&current_ace->trustee, &psa->trustee);
1366
1367                 /*
1368                  * Try and work out if the SID is a user or group
1369                  * as we need to flag these differently for POSIX.
1370                  * Note what kind of a POSIX ACL this should map to.
1371                  */
1372
1373                 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1374                         current_ace->owner_type = WORLD_ACE;
1375                         current_ace->unix_ug.world = -1;
1376                         current_ace->type = SMB_ACL_OTHER;
1377                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1378                         current_ace->owner_type = UID_ACE;
1379                         current_ace->unix_ug.uid = pst->st_uid;
1380                         current_ace->type = SMB_ACL_USER_OBJ;
1381
1382                         /*
1383                          * The Creator Owner entry only specifies inheritable permissions,
1384                          * never access permissions. WinNT doesn't always set the ACE to
1385                          *INHERIT_ONLY, though.
1386                          */
1387
1388                         if (nt4_compatible_acls())
1389                                 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1390                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1391                         current_ace->owner_type = GID_ACE;
1392                         current_ace->unix_ug.gid = pst->st_gid;
1393                         current_ace->type = SMB_ACL_GROUP_OBJ;
1394
1395                         /*
1396                          * The Creator Group entry only specifies inheritable permissions,
1397                          * never access permissions. WinNT doesn't always set the ACE to
1398                          *INHERIT_ONLY, though.
1399                          */
1400                         if (nt4_compatible_acls())
1401                                 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1402
1403                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1404                         current_ace->owner_type = UID_ACE;
1405                         /* If it's the owning user, this is a user_obj, not
1406                          * a user. */
1407                         if (current_ace->unix_ug.uid == pst->st_uid) {
1408                                 current_ace->type = SMB_ACL_USER_OBJ;
1409                         } else {
1410                                 current_ace->type = SMB_ACL_USER;
1411                         }
1412                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1413                         current_ace->owner_type = GID_ACE;
1414                         /* If it's the primary group, this is a group_obj, not
1415                          * a group. */
1416                         if (current_ace->unix_ug.gid == pst->st_gid) {
1417                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1418                         } else {
1419                                 current_ace->type = SMB_ACL_GROUP;
1420                         }
1421                 } else {
1422                         fstring str;
1423
1424                         /*
1425                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1426                          */
1427
1428                         if (non_mappable_sid(&psa->trustee)) {
1429                                 DEBUG(10,("create_canon_ace_lists: ignoring non-mappable SID %s\n",
1430                                         sid_to_string(str, &psa->trustee) ));
1431                                 SAFE_FREE(current_ace);
1432                                 continue;
1433                         }
1434
1435                         free_canon_ace_list(file_ace);
1436                         free_canon_ace_list(dir_ace);
1437                         DEBUG(0,("create_canon_ace_lists: unable to map SID %s to uid or gid.\n",
1438                                 sid_to_string(str, &current_ace->trustee) ));
1439                         SAFE_FREE(current_ace);
1440                         return False;
1441                 }
1442
1443                 /*
1444                  * Map the given NT permissions into a UNIX mode_t containing only
1445                  * S_I(R|W|X)USR bits.
1446                  */
1447
1448                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1449                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1450                 current_ace->inherited = ((psa->flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False);
1451
1452                 /*
1453                  * Now add the created ace to either the file list, the directory
1454                  * list, or both. We *MUST* preserve the order here (hence we use
1455                  * DLIST_ADD_END) as NT ACLs are order dependent.
1456                  */
1457
1458                 if (fsp->is_directory) {
1459
1460                         /*
1461                          * We can only add to the default POSIX ACE list if the ACE is
1462                          * designed to be inherited by both files and directories.
1463                          */
1464
1465                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1466                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1467
1468                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1469
1470                                 /*
1471                                  * Note if this was an allow ace. We can't process
1472                                  * any further deny ace's after this.
1473                                  */
1474
1475                                 if (current_ace->attr == ALLOW_ACE)
1476                                         got_dir_allow = True;
1477
1478                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1479                                         DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1480 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1481                                         free_canon_ace_list(file_ace);
1482                                         free_canon_ace_list(dir_ace);
1483                                         return False;
1484                                 }
1485
1486                                 if( DEBUGLVL( 10 )) {
1487                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1488                                         print_canon_ace( current_ace, 0);
1489                                 }
1490
1491                                 /*
1492                                  * If this is not an inherit only ACE we need to add a duplicate
1493                                  * to the file acl.
1494                                  */
1495
1496                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1497                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1498
1499                                         if (!dup_ace) {
1500                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1501                                                 free_canon_ace_list(file_ace);
1502                                                 free_canon_ace_list(dir_ace);
1503                                                 return False;
1504                                         }
1505
1506                                         /*
1507                                          * We must not free current_ace here as its
1508                                          * pointer is now owned by the dir_ace list.
1509                                          */
1510                                         current_ace = dup_ace;
1511                                 } else {
1512                                         /*
1513                                          * We must not free current_ace here as its
1514                                          * pointer is now owned by the dir_ace list.
1515                                          */
1516                                         current_ace = NULL;
1517                                 }
1518                         }
1519                 }
1520
1521                 /*
1522                  * Only add to the file ACL if not inherit only.
1523                  */
1524
1525                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1526                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1527
1528                         /*
1529                          * Note if this was an allow ace. We can't process
1530                          * any further deny ace's after this.
1531                          */
1532
1533                         if (current_ace->attr == ALLOW_ACE)
1534                                 got_file_allow = True;
1535
1536                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1537                                 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1538 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1539                                 free_canon_ace_list(file_ace);
1540                                 free_canon_ace_list(dir_ace);
1541                                 return False;
1542                         }
1543
1544                         if( DEBUGLVL( 10 )) {
1545                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1546                                 print_canon_ace( current_ace, 0);
1547                         }
1548                         all_aces_are_inherit_only = False;
1549                         /*
1550                          * We must not free current_ace here as its
1551                          * pointer is now owned by the file_ace list.
1552                          */
1553                         current_ace = NULL;
1554                 }
1555
1556                 /*
1557                  * Free if ACE was not added.
1558                  */
1559
1560                 SAFE_FREE(current_ace);
1561         }
1562
1563         if (fsp->is_directory && all_aces_are_inherit_only) {
1564                 /*
1565                  * Windows 2000 is doing one of these weird 'inherit acl'
1566                  * traverses to conserve NTFS ACL resources. Just pretend
1567                  * there was no DACL sent. JRA.
1568                  */
1569
1570                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1571                 free_canon_ace_list(file_ace);
1572                 free_canon_ace_list(dir_ace);
1573                 file_ace = NULL;
1574                 dir_ace = NULL;
1575         } else {
1576                 /*
1577                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1578                  * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1579                  * entries can be converted to *_OBJ. Usually we will already have these
1580                  * entries in the Default ACL, and the Access ACL will not have them.
1581                  */
1582                 if (file_ace) {
1583                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1584                 }
1585                 if (dir_ace) {
1586                         check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1587                 }
1588         }
1589
1590         *ppfile_ace = file_ace;
1591         *ppdir_ace = dir_ace;
1592
1593         return True;
1594 }
1595
1596 /****************************************************************************
1597  ASCII art time again... JRA :-).
1598
1599  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1600  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1601  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1602  allow or deny have been merged, so the same SID can only appear once in the deny
1603  list or once in the allow list.
1604
1605  We then process as follows :
1606
1607  ---------------------------------------------------------------------------
1608  First pass - look for a Everyone DENY entry.
1609
1610  If it is deny all (rwx) trunate the list at this point.
1611  Else, walk the list from this point and use the deny permissions of this
1612  entry as a mask on all following allow entries. Finally, delete
1613  the Everyone DENY entry (we have applied it to everything possible).
1614
1615  In addition, in this pass we remove any DENY entries that have
1616  no permissions (ie. they are a DENY nothing).
1617  ---------------------------------------------------------------------------
1618  Second pass - only deal with deny user entries.
1619
1620  DENY user1 (perms XXX)
1621
1622  new_perms = 0
1623  for all following allow group entries where user1 is in group
1624         new_perms |= group_perms;
1625
1626  user1 entry perms = new_perms & ~ XXX;
1627
1628  Convert the deny entry to an allow entry with the new perms and
1629  push to the end of the list. Note if the user was in no groups
1630  this maps to a specific allow nothing entry for this user.
1631
1632  The common case from the NT ACL choser (userX deny all) is
1633  optimised so we don't do the group lookup - we just map to
1634  an allow nothing entry.
1635
1636  What we're doing here is inferring the allow permissions the
1637  person setting the ACE on user1 wanted by looking at the allow
1638  permissions on the groups the user is currently in. This will
1639  be a snapshot, depending on group membership but is the best
1640  we can do and has the advantage of failing closed rather than
1641  open.
1642  ---------------------------------------------------------------------------
1643  Third pass - only deal with deny group entries.
1644
1645  DENY group1 (perms XXX)
1646
1647  for all following allow user entries where user is in group1
1648    user entry perms = user entry perms & ~ XXX;
1649
1650  If there is a group Everyone allow entry with permissions YYY,
1651  convert the group1 entry to an allow entry and modify its
1652  permissions to be :
1653
1654  new_perms = YYY & ~ XXX
1655
1656  and push to the end of the list.
1657
1658  If there is no group Everyone allow entry then convert the
1659  group1 entry to a allow nothing entry and push to the end of the list.
1660
1661  Note that the common case from the NT ACL choser (groupX deny all)
1662  cannot be optimised here as we need to modify user entries who are
1663  in the group to change them to a deny all also.
1664
1665  What we're doing here is modifying the allow permissions of
1666  user entries (which are more specific in POSIX ACLs) to mask
1667  out the explicit deny set on the group they are in. This will
1668  be a snapshot depending on current group membership but is the
1669  best we can do and has the advantage of failing closed rather
1670  than open.
1671  ---------------------------------------------------------------------------
1672  Fourth pass - cope with cumulative permissions.
1673
1674  for all allow user entries, if there exists an allow group entry with
1675  more permissive permissions, and the user is in that group, rewrite the
1676  allow user permissions to contain both sets of permissions.
1677
1678  Currently the code for this is #ifdef'ed out as these semantics make
1679  no sense to me. JRA.
1680  ---------------------------------------------------------------------------
1681
1682  Note we *MUST* do the deny user pass first as this will convert deny user
1683  entries into allow user entries which can then be processed by the deny
1684  group pass.
1685
1686  The above algorithm took a *lot* of thinking about - hence this
1687  explaination :-). JRA.
1688 ****************************************************************************/
1689
1690 /****************************************************************************
1691  Process a canon_ace list entries. This is very complex code. We need
1692  to go through and remove the "deny" permissions from any allow entry that matches
1693  the id of this entry. We have already refused any NT ACL that wasn't in correct
1694  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1695  we just remove it (to fail safe). We have already removed any duplicate ace
1696  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1697  allow entries.
1698 ****************************************************************************/
1699
1700 static void process_deny_list( canon_ace **pp_ace_list )
1701 {
1702         canon_ace *ace_list = *pp_ace_list;
1703         canon_ace *curr_ace = NULL;
1704         canon_ace *curr_ace_next = NULL;
1705
1706         /* Pass 1 above - look for an Everyone, deny entry. */
1707
1708         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1709                 canon_ace *allow_ace_p;
1710
1711                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1712
1713                 if (curr_ace->attr != DENY_ACE)
1714                         continue;
1715
1716                 if (curr_ace->perms == (mode_t)0) {
1717
1718                         /* Deny nothing entry - delete. */
1719
1720                         DLIST_REMOVE(ace_list, curr_ace);
1721                         continue;
1722                 }
1723
1724                 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1725                         continue;
1726
1727                 /* JRATEST - assert. */
1728                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1729
1730                 if (curr_ace->perms == ALL_ACE_PERMS) {
1731
1732                         /*
1733                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1734                          * list at this point including this entry.
1735                          */
1736
1737                         canon_ace *prev_entry = curr_ace->prev;
1738
1739                         free_canon_ace_list( curr_ace );
1740                         if (prev_entry)
1741                                 prev_entry->next = NULL;
1742                         else {
1743                                 /* We deleted the entire list. */
1744                                 ace_list = NULL;
1745                         }
1746                         break;
1747                 }
1748
1749                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1750
1751                         /*
1752                          * Only mask off allow entries.
1753                          */
1754
1755                         if (allow_ace_p->attr != ALLOW_ACE)
1756                                 continue;
1757
1758                         allow_ace_p->perms &= ~curr_ace->perms;
1759                 }
1760
1761                 /*
1762                  * Now it's been applied, remove it.
1763                  */
1764
1765                 DLIST_REMOVE(ace_list, curr_ace);
1766         }
1767
1768         /* Pass 2 above - deal with deny user entries. */
1769
1770         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1771                 mode_t new_perms = (mode_t)0;
1772                 canon_ace *allow_ace_p;
1773
1774                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1775
1776                 if (curr_ace->attr != DENY_ACE)
1777                         continue;
1778
1779                 if (curr_ace->owner_type != UID_ACE)
1780                         continue;
1781
1782                 if (curr_ace->perms == ALL_ACE_PERMS) {
1783
1784                         /*
1785                          * Optimisation - this is a deny everything to this user.
1786                          * Convert to an allow nothing and push to the end of the list.
1787                          */
1788
1789                         curr_ace->attr = ALLOW_ACE;
1790                         curr_ace->perms = (mode_t)0;
1791                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1792                         continue;
1793                 }
1794
1795                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1796
1797                         if (allow_ace_p->attr != ALLOW_ACE)
1798                                 continue;
1799
1800                         /* We process GID_ACE and WORLD_ACE entries only. */
1801
1802                         if (allow_ace_p->owner_type == UID_ACE)
1803                                 continue;
1804
1805                         if (uid_entry_in_group( curr_ace, allow_ace_p))
1806                                 new_perms |= allow_ace_p->perms;
1807                 }
1808
1809                 /*
1810                  * Convert to a allow entry, modify the perms and push to the end
1811                  * of the list.
1812                  */
1813
1814                 curr_ace->attr = ALLOW_ACE;
1815                 curr_ace->perms = (new_perms & ~curr_ace->perms);
1816                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1817         }
1818
1819         /* Pass 3 above - deal with deny group entries. */
1820
1821         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1822                 canon_ace *allow_ace_p;
1823                 canon_ace *allow_everyone_p = NULL;
1824
1825                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1826
1827                 if (curr_ace->attr != DENY_ACE)
1828                         continue;
1829
1830                 if (curr_ace->owner_type != GID_ACE)
1831                         continue;
1832
1833                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1834
1835                         if (allow_ace_p->attr != ALLOW_ACE)
1836                                 continue;
1837
1838                         /* Store a pointer to the Everyone allow, if it exists. */
1839                         if (allow_ace_p->owner_type == WORLD_ACE)
1840                                 allow_everyone_p = allow_ace_p;
1841
1842                         /* We process UID_ACE entries only. */
1843
1844                         if (allow_ace_p->owner_type != UID_ACE)
1845                                 continue;
1846
1847                         /* Mask off the deny group perms. */
1848
1849                         if (uid_entry_in_group( allow_ace_p, curr_ace))
1850                                 allow_ace_p->perms &= ~curr_ace->perms;
1851                 }
1852
1853                 /*
1854                  * Convert the deny to an allow with the correct perms and
1855                  * push to the end of the list.
1856                  */
1857
1858                 curr_ace->attr = ALLOW_ACE;
1859                 if (allow_everyone_p)
1860                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
1861                 else
1862                         curr_ace->perms = (mode_t)0;
1863                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1864         }
1865
1866         /* Doing this fourth pass allows Windows semantics to be layered
1867          * on top of POSIX semantics. I'm not sure if this is desirable.
1868          * For example, in W2K ACLs there is no way to say, "Group X no
1869          * access, user Y full access" if user Y is a member of group X.
1870          * This seems completely broken semantics to me.... JRA.
1871          */
1872
1873 #if 0
1874         /* Pass 4 above - deal with allow entries. */
1875
1876         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1877                 canon_ace *allow_ace_p;
1878
1879                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1880
1881                 if (curr_ace->attr != ALLOW_ACE)
1882                         continue;
1883
1884                 if (curr_ace->owner_type != UID_ACE)
1885                         continue;
1886
1887                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1888
1889                         if (allow_ace_p->attr != ALLOW_ACE)
1890                                 continue;
1891
1892                         /* We process GID_ACE entries only. */
1893
1894                         if (allow_ace_p->owner_type != GID_ACE)
1895                                 continue;
1896
1897                         /* OR in the group perms. */
1898
1899                         if (uid_entry_in_group( curr_ace, allow_ace_p))
1900                                 curr_ace->perms |= allow_ace_p->perms;
1901                 }
1902         }
1903 #endif
1904
1905         *pp_ace_list = ace_list;
1906 }
1907
1908 /****************************************************************************
1909  Create a default mode that will be used if a security descriptor entry has
1910  no user/group/world entries.
1911 ****************************************************************************/
1912
1913 static mode_t create_default_mode(files_struct *fsp, BOOL interitable_mode)
1914 {
1915         int snum = SNUM(fsp->conn);
1916         mode_t and_bits = (mode_t)0;
1917         mode_t or_bits = (mode_t)0;
1918         mode_t mode = interitable_mode
1919                 ? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name,
1920                              NULL )
1921                 : S_IRUSR;
1922
1923         if (fsp->is_directory)
1924                 mode |= (S_IWUSR|S_IXUSR);
1925
1926         /*
1927          * Now AND with the create mode/directory mode bits then OR with the
1928          * force create mode/force directory mode bits.
1929          */
1930
1931         if (fsp->is_directory) {
1932                 and_bits = lp_dir_security_mask(snum);
1933                 or_bits = lp_force_dir_security_mode(snum);
1934         } else {
1935                 and_bits = lp_security_mask(snum);
1936                 or_bits = lp_force_security_mode(snum);
1937         }
1938
1939         return ((mode & and_bits)|or_bits);
1940 }
1941
1942 /****************************************************************************
1943  Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
1944  succeeding.
1945 ****************************************************************************/
1946
1947 static BOOL unpack_canon_ace(files_struct *fsp,
1948                                                         SMB_STRUCT_STAT *pst,
1949                                                         DOM_SID *pfile_owner_sid,
1950                                                         DOM_SID *pfile_grp_sid,
1951                                                         canon_ace **ppfile_ace, canon_ace **ppdir_ace,
1952                                                         uint32 security_info_sent, SEC_DESC *psd)
1953 {
1954         canon_ace *file_ace = NULL;
1955         canon_ace *dir_ace = NULL;
1956
1957         *ppfile_ace = NULL;
1958         *ppdir_ace = NULL;
1959
1960         if(security_info_sent == 0) {
1961                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
1962                 return False;
1963         }
1964
1965         /*
1966          * If no DACL then this is a chown only security descriptor.
1967          */
1968
1969         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
1970                 return True;
1971
1972         /*
1973          * Now go through the DACL and create the canon_ace lists.
1974          */
1975
1976         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
1977                                                                 &file_ace, &dir_ace, psd->dacl))
1978                 return False;
1979
1980         if ((file_ace == NULL) && (dir_ace == NULL)) {
1981                 /* W2K traverse DACL set - ignore. */
1982                 return True;
1983         }
1984
1985         /*
1986          * Go through the canon_ace list and merge entries
1987          * belonging to identical users of identical allow or deny type.
1988          * We can do this as all deny entries come first, followed by
1989          * all allow entries (we have mandated this before accepting this acl).
1990          */
1991
1992         print_canon_ace_list( "file ace - before merge", file_ace);
1993         merge_aces( &file_ace );
1994
1995         print_canon_ace_list( "dir ace - before merge", dir_ace);
1996         merge_aces( &dir_ace );
1997
1998         /*
1999          * NT ACLs are order dependent. Go through the acl lists and
2000          * process DENY entries by masking the allow entries.
2001          */
2002
2003         print_canon_ace_list( "file ace - before deny", file_ace);
2004         process_deny_list( &file_ace);
2005
2006         print_canon_ace_list( "dir ace - before deny", dir_ace);
2007         process_deny_list( &dir_ace);
2008
2009         /*
2010          * A well formed POSIX file or default ACL has at least 3 entries, a
2011          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2012          * and optionally a mask entry. Ensure this is the case.
2013          */
2014
2015         print_canon_ace_list( "file ace - before valid", file_ace);
2016
2017         /*
2018          * A default 3 element mode entry for a file should be r-- --- ---.
2019          * A default 3 element mode entry for a directory should be rwx --- ---.
2020          */
2021
2022         pst->st_mode = create_default_mode(fsp, False);
2023
2024         if (!ensure_canon_entry_valid(&file_ace, fsp, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2025                 free_canon_ace_list(file_ace);
2026                 free_canon_ace_list(dir_ace);
2027                 return False;
2028         }
2029
2030         print_canon_ace_list( "dir ace - before valid", dir_ace);
2031
2032         /*
2033          * A default inheritable 3 element mode entry for a directory should be the
2034          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2035          * it's a directory.
2036          */
2037
2038         pst->st_mode = create_default_mode(fsp, True);
2039
2040         if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2041                 free_canon_ace_list(file_ace);
2042                 free_canon_ace_list(dir_ace);
2043                 return False;
2044         }
2045
2046         print_canon_ace_list( "file ace - return", file_ace);
2047         print_canon_ace_list( "dir ace - return", dir_ace);
2048
2049         *ppfile_ace = file_ace;
2050         *ppdir_ace = dir_ace;
2051         return True;
2052
2053 }
2054
2055 /******************************************************************************
2056  When returning permissions, try and fit NT display
2057  semantics if possible. Note the the canon_entries here must have been malloced.
2058  The list format should be - first entry = owner, followed by group and other user
2059  entries, last entry = other.
2060
2061  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2062  are not ordered, and match on the most specific entry rather than walking a list,
2063  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2064
2065  Entry 0: owner : deny all except read and write.
2066  Entry 1: owner : allow read and write.
2067  Entry 2: group : deny all except read.
2068  Entry 3: group : allow read.
2069  Entry 4: Everyone : allow read.
2070
2071  But NT cannot display this in their ACL editor !
2072 ********************************************************************************/
2073
2074 static void arrange_posix_perms( char *filename, canon_ace **pp_list_head)
2075 {
2076         canon_ace *list_head = *pp_list_head;
2077         canon_ace *owner_ace = NULL;
2078         canon_ace *other_ace = NULL;
2079         canon_ace *ace = NULL;
2080
2081         for (ace = list_head; ace; ace = ace->next) {
2082                 if (ace->type == SMB_ACL_USER_OBJ)
2083                         owner_ace = ace;
2084                 else if (ace->type == SMB_ACL_OTHER) {
2085                         /* Last ace - this is "other" */
2086                         other_ace = ace;
2087                 }
2088         }
2089
2090         if (!owner_ace || !other_ace) {
2091                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2092                         filename ));
2093                 return;
2094         }
2095
2096         /*
2097          * The POSIX algorithm applies to owner first, and other last,
2098          * so ensure they are arranged in this order.
2099          */
2100
2101         if (owner_ace) {
2102                 DLIST_PROMOTE(list_head, owner_ace);
2103         }
2104
2105         if (other_ace) {
2106                 DLIST_DEMOTE(list_head, other_ace, canon_ace *);
2107         }
2108
2109         /* We have probably changed the head of the list. */
2110
2111         *pp_list_head = list_head;
2112 }
2113
2114 /****************************************************************************
2115  Create a linked list of canonical ACE entries.
2116 ****************************************************************************/
2117
2118 static canon_ace *canonicalise_acl( files_struct *fsp, SMB_ACL_T posix_acl, SMB_STRUCT_STAT *psbuf,
2119                                         const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2120 {
2121         connection_struct *conn = fsp->conn;
2122         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2123         canon_ace *list_head = NULL;
2124         canon_ace *ace = NULL;
2125         canon_ace *next_ace = NULL;
2126         int entry_id = SMB_ACL_FIRST_ENTRY;
2127         SMB_ACL_ENTRY_T entry;
2128         size_t ace_count;
2129
2130         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2131                 SMB_ACL_TAG_T tagtype;
2132                 SMB_ACL_PERMSET_T permset;
2133                 DOM_SID sid;
2134                 posix_id unix_ug;
2135                 enum ace_owner owner_type;
2136
2137                 /* get_next... */
2138                 if (entry_id == SMB_ACL_FIRST_ENTRY)
2139                         entry_id = SMB_ACL_NEXT_ENTRY;
2140
2141                 /* Is this a MASK entry ? */
2142                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2143                         continue;
2144
2145                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2146                         continue;
2147
2148                 /* Decide which SID to use based on the ACL type. */
2149                 switch(tagtype) {
2150                         case SMB_ACL_USER_OBJ:
2151                                 /* Get the SID from the owner. */
2152                                 sid_copy(&sid, powner);
2153                                 unix_ug.uid = psbuf->st_uid;
2154                                 owner_type = UID_ACE;
2155                                 break;
2156                         case SMB_ACL_USER:
2157                                 {
2158                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2159                                         if (puid == NULL) {
2160                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2161                                                 continue;
2162                                         }
2163                                         /*
2164                                          * A SMB_ACL_USER entry for the owner is shadowed by the
2165                                          * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2166                                          * that entry, so we ignore it. We also don't create such
2167                                          * entries out of the blue when setting ACLs, so a get/set
2168                                          * cycle will drop them.
2169                                          */
2170                                         if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_uid) {
2171                                                 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2172                                                 continue;
2173                                         }
2174                                         uid_to_sid( &sid, *puid);
2175                                         unix_ug.uid = *puid;
2176                                         owner_type = UID_ACE;
2177                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2178                                         break;
2179                                 }
2180                         case SMB_ACL_GROUP_OBJ:
2181                                 /* Get the SID from the owning group. */
2182                                 sid_copy(&sid, pgroup);
2183                                 unix_ug.gid = psbuf->st_gid;
2184                                 owner_type = GID_ACE;
2185                                 break;
2186                         case SMB_ACL_GROUP:
2187                                 {
2188                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2189                                         if (pgid == NULL) {
2190                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2191                                                 continue;
2192                                         }
2193                                         gid_to_sid( &sid, *pgid);
2194                                         unix_ug.gid = *pgid;
2195                                         owner_type = GID_ACE;
2196                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2197                                         break;
2198                                 }
2199                         case SMB_ACL_MASK:
2200                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2201                                 continue; /* Don't count the mask as an entry. */
2202                         case SMB_ACL_OTHER:
2203                                 /* Use the Everyone SID */
2204                                 sid = global_sid_World;
2205                                 unix_ug.world = -1;
2206                                 owner_type = WORLD_ACE;
2207                                 break;
2208                         default:
2209                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2210                                 continue;
2211                 }
2212
2213                 /*
2214                  * Add this entry to the list.
2215                  */
2216
2217                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2218                         goto fail;
2219
2220                 ZERO_STRUCTP(ace);
2221                 ace->type = tagtype;
2222                 ace->perms = convert_permset_to_mode_t(conn, permset);
2223                 ace->attr = ALLOW_ACE;
2224                 ace->trustee = sid;
2225                 ace->unix_ug = unix_ug;
2226                 ace->owner_type = owner_type;
2227                 ace->inherited = get_inherited_flag(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2228
2229                 DLIST_ADD(list_head, ace);
2230         }
2231
2232         /*
2233          * This next call will ensure we have at least a user/group/world set.
2234          */
2235
2236         if (!ensure_canon_entry_valid(&list_head, fsp, powner, pgroup, psbuf, False))
2237                 goto fail;
2238
2239         /*
2240          * Now go through the list, masking the permissions with the
2241          * acl_mask. Ensure all DENY Entries are at the start of the list.
2242          */
2243
2244         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2245
2246         for ( ace_count = 0, ace = list_head; ace; ace = next_ace, ace_count++) {
2247                 next_ace = ace->next;
2248
2249                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2250                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2251                         ace->perms &= acl_mask;
2252
2253                 if (ace->perms == 0) {
2254                         DLIST_PROMOTE(list_head, ace);
2255                 }
2256
2257                 if( DEBUGLVL( 10 ) ) {
2258                         print_canon_ace(ace, ace_count);
2259                 }
2260         }
2261
2262         arrange_posix_perms(fsp->fsp_name,&list_head );
2263
2264         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", list_head );
2265
2266         return list_head;
2267
2268   fail:
2269
2270         free_canon_ace_list(list_head);
2271         return NULL;
2272 }
2273
2274 /****************************************************************************
2275  Check if the current user group list contains a given group.
2276 ****************************************************************************/
2277
2278 static BOOL current_user_in_group(gid_t gid)
2279 {
2280         int i;
2281
2282         for (i = 0; i < current_user.ut.ngroups; i++) {
2283                 if (current_user.ut.groups[i] == gid) {
2284                         return True;
2285                 }
2286         }
2287
2288         return False;
2289 }
2290
2291 /****************************************************************************
2292  Should we override a deny ?  Check 'acl group control' and 'dos filemode'
2293 ****************************************************************************/
2294
2295 static BOOL acl_group_override(connection_struct *conn, gid_t prim_gid, const char *fname)
2296 {
2297         SMB_STRUCT_STAT sbuf;
2298
2299         ZERO_STRUCT(sbuf);
2300
2301         if ((errno != EPERM) && (errno != EACCES)) {
2302                 return False;
2303         }
2304
2305         /* file primary group == user primary or supplementary group */
2306         if (lp_acl_group_control(SNUM(conn)) && current_user_in_group(prim_gid)) {
2307                 return True;
2308         }
2309
2310         /* user has writeable permission */
2311         if (lp_dos_filemode(SNUM(conn)) && can_write_to_file(conn, fname, &sbuf)) {
2312                 return True;
2313         }
2314
2315         return False;
2316 }
2317
2318 /****************************************************************************
2319  Attempt to apply an ACL to a file or directory.
2320 ****************************************************************************/
2321
2322 static BOOL set_canon_ace_list(files_struct *fsp, canon_ace *the_ace, BOOL default_ace, gid_t prim_gid, BOOL *pacl_set_support)
2323 {
2324         connection_struct *conn = fsp->conn;
2325         BOOL ret = False;
2326         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2327         canon_ace *p_ace;
2328         int i;
2329         SMB_ACL_ENTRY_T mask_entry;
2330         BOOL got_mask_entry = False;
2331         SMB_ACL_PERMSET_T mask_permset;
2332         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2333         BOOL needs_mask = False;
2334         mode_t mask_perms = 0;
2335
2336 #if defined(POSIX_ACL_NEEDS_MASK)
2337         /* HP-UX always wants to have a mask (called "class" there). */
2338         needs_mask = True;
2339 #endif
2340
2341         if (the_acl == NULL) {
2342
2343                 if (!no_acl_syscall_error(errno)) {
2344                         /*
2345                          * Only print this error message if we have some kind of ACL
2346                          * support that's not working. Otherwise we would always get this.
2347                          */
2348                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2349                                 default_ace ? "default" : "file", strerror(errno) ));
2350                 }
2351                 *pacl_set_support = False;
2352                 return False;
2353         }
2354
2355         if( DEBUGLVL( 10 )) {
2356                 dbgtext("set_canon_ace_list: setting ACL:\n");
2357                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2358                         print_canon_ace( p_ace, i);
2359                 }
2360         }
2361
2362         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2363                 SMB_ACL_ENTRY_T the_entry;
2364                 SMB_ACL_PERMSET_T the_permset;
2365
2366                 /*
2367                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2368                  * named group entries. But if there is an ACL_MASK entry, it applies
2369                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2370                  * so that it doesn't deny (i.e., mask off) any permissions.
2371                  */
2372
2373                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2374                         needs_mask = True;
2375                         mask_perms |= p_ace->perms;
2376                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2377                         mask_perms |= p_ace->perms;
2378                 }
2379
2380                 /*
2381                  * Get the entry for this ACE.
2382                  */
2383
2384                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2385                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2386                                 i, strerror(errno) ));
2387                         goto fail;
2388                 }
2389
2390                 if (p_ace->type == SMB_ACL_MASK) {
2391                         mask_entry = the_entry;
2392                         got_mask_entry = True;
2393                 }
2394
2395                 /*
2396                  * Ok - we now know the ACL calls should be working, don't
2397                  * allow fallback to chmod.
2398                  */
2399
2400                 *pacl_set_support = True;
2401
2402                 /*
2403                  * Initialise the entry from the canon_ace.
2404                  */
2405
2406                 /*
2407                  * First tell the entry what type of ACE this is.
2408                  */
2409
2410                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2411                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2412                                 i, strerror(errno) ));
2413                         goto fail;
2414                 }
2415
2416                 /*
2417                  * Only set the qualifier (user or group id) if the entry is a user
2418                  * or group id ACE.
2419                  */
2420
2421                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2422                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2423                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2424                                         i, strerror(errno) ));
2425                                 goto fail;
2426                         }
2427                 }
2428
2429                 /*
2430                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2431                  */
2432
2433                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2434                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2435                                 i, strerror(errno) ));
2436                         goto fail;
2437                 }
2438
2439                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2440                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2441                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2442                         goto fail;
2443                 }
2444
2445                 /*
2446                  * ..and apply them to the entry.
2447                  */
2448
2449                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2450                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2451                                 i, strerror(errno) ));
2452                         goto fail;
2453                 }
2454
2455                 if( DEBUGLVL( 10 ))
2456                         print_canon_ace( p_ace, i);
2457
2458         }
2459
2460         if (needs_mask && !got_mask_entry) {
2461                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2462                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2463                         goto fail;
2464                 }
2465
2466                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2467                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2468                         goto fail;
2469                 }
2470
2471                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2472                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2473                         goto fail;
2474                 }
2475
2476                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2477                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2478                         goto fail;
2479                 }
2480
2481                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2482                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2483                         goto fail;
2484                 }
2485         }
2486
2487         /*
2488          * Finally apply it to the file or directory.
2489          */
2490
2491         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2492                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2493                         /*
2494                          * Some systems allow all the above calls and only fail with no ACL support
2495                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2496                          */
2497                         if (no_acl_syscall_error(errno)) {
2498                                 *pacl_set_support = False;
2499                         }
2500
2501                         if (acl_group_override(conn, prim_gid, fsp->fsp_name)) {
2502                                 int sret;
2503
2504                                 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2505                                         fsp->fsp_name ));
2506
2507                                 become_root();
2508                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl);
2509                                 unbecome_root();
2510                                 if (sret == 0) {
2511                                         ret = True;
2512                                 }
2513                         }
2514
2515                         if (ret == False) {
2516                                 DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2517                                                 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2518                                                 fsp->fsp_name, strerror(errno) ));
2519                                 goto fail;
2520                         }
2521                 }
2522         } else {
2523                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, the_acl) == -1) {
2524                         /*
2525                          * Some systems allow all the above calls and only fail with no ACL support
2526                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2527                          */
2528                         if (no_acl_syscall_error(errno)) {
2529                                 *pacl_set_support = False;
2530                         }
2531
2532                         if (acl_group_override(conn, prim_gid, fsp->fsp_name)) {
2533                                 int sret;
2534
2535                                 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2536                                         fsp->fsp_name ));
2537
2538                                 become_root();
2539                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, the_acl);
2540                                 unbecome_root();
2541                                 if (sret == 0) {
2542                                         ret = True;
2543                                 }
2544                         }
2545
2546                         if (ret == False) {
2547                                 DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2548                                                 fsp->fsp_name, strerror(errno) ));
2549                                 goto fail;
2550                         }
2551                 }
2552         }
2553
2554         ret = True;
2555
2556   fail:
2557
2558         if (the_acl != NULL) {
2559                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2560         }
2561
2562         return ret;
2563 }
2564
2565 /****************************************************************************
2566  Find a particular canon_ace entry.
2567 ****************************************************************************/
2568
2569 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2570 {
2571         while (list) {
2572                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2573                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2574                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2575                         break;
2576                 list = list->next;
2577         }
2578         return list;
2579 }
2580
2581 /****************************************************************************
2582
2583 ****************************************************************************/
2584
2585 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2586 {
2587         SMB_ACL_ENTRY_T entry;
2588
2589         if (!the_acl)
2590                 return NULL;
2591         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2592                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2593                 return NULL;
2594         }
2595         return the_acl;
2596 }
2597
2598 /****************************************************************************
2599  Convert a canon_ace to a generic 3 element permission - if possible.
2600 ****************************************************************************/
2601
2602 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2603
2604 static BOOL convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2605 {
2606         int snum = SNUM(fsp->conn);
2607         size_t ace_count = count_canon_ace_list(file_ace_list);
2608         canon_ace *ace_p;
2609         canon_ace *owner_ace = NULL;
2610         canon_ace *group_ace = NULL;
2611         canon_ace *other_ace = NULL;
2612         mode_t and_bits;
2613         mode_t or_bits;
2614
2615         if (ace_count != 3) {
2616                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2617 posix perms.\n", fsp->fsp_name ));
2618                 return False;
2619         }
2620
2621         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2622                 if (ace_p->owner_type == UID_ACE)
2623                         owner_ace = ace_p;
2624                 else if (ace_p->owner_type == GID_ACE)
2625                         group_ace = ace_p;
2626                 else if (ace_p->owner_type == WORLD_ACE)
2627                         other_ace = ace_p;
2628         }
2629
2630         if (!owner_ace || !group_ace || !other_ace) {
2631                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2632                                 fsp->fsp_name ));
2633                 return False;
2634         }
2635
2636         *posix_perms = (mode_t)0;
2637
2638         *posix_perms |= owner_ace->perms;
2639         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2640         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2641         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2642         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2643         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2644         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2645
2646         /* The owner must have at least read access. */
2647
2648         *posix_perms |= S_IRUSR;
2649         if (fsp->is_directory)
2650                 *posix_perms |= (S_IWUSR|S_IXUSR);
2651
2652         /* If requested apply the masks. */
2653
2654         /* Get the initial bits to apply. */
2655
2656         if (fsp->is_directory) {
2657                 and_bits = lp_dir_security_mask(snum);
2658                 or_bits = lp_force_dir_security_mode(snum);
2659         } else {
2660                 and_bits = lp_security_mask(snum);
2661                 or_bits = lp_force_security_mode(snum);
2662         }
2663
2664         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2665
2666         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2667                 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2668                 fsp->fsp_name ));
2669
2670         return True;
2671 }
2672
2673 /****************************************************************************
2674   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2675   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2676   with CI|OI set so it is inherited and also applies to the directory.
2677   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2678 ****************************************************************************/
2679
2680 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2681 {
2682         size_t i, j;
2683
2684         for (i = 0; i < num_aces; i++) {
2685                 for (j = i+1; j < num_aces; j++) {
2686                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2687                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2688                         BOOL i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2689                         BOOL j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2690
2691                         /* We know the lower number ACE's are file entries. */
2692                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2693                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2694                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2695                                 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2696                                 (i_inh == j_inh) &&
2697                                 (i_flags_ni == 0) &&
2698                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2699                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
2700                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
2701                                 /*
2702                                  * W2K wants to have access allowed zero access ACE's
2703                                  * at the end of the list. If the mask is zero, merge
2704                                  * the non-inherited ACE onto the inherited ACE.
2705                                  */
2706
2707                                 if (nt_ace_list[i].access_mask == 0) {
2708                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2709                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2710                                         if (num_aces - i - 1 > 0)
2711                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2712                                                                 sizeof(SEC_ACE));
2713
2714                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2715                                                 (unsigned int)i, (unsigned int)j ));
2716                                 } else {
2717                                         /*
2718                                          * These are identical except for the flags.
2719                                          * Merge the inherited ACE onto the non-inherited ACE.
2720                                          */
2721
2722                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2723                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2724                                         if (num_aces - j - 1 > 0)
2725                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
2726                                                                 sizeof(SEC_ACE));
2727
2728                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
2729                                                 (unsigned int)j, (unsigned int)i ));
2730                                 }
2731                                 num_aces--;
2732                                 break;
2733                         }
2734                 }
2735         }
2736
2737         return num_aces;
2738 }
2739 /****************************************************************************
2740  Reply to query a security descriptor from an fsp. If it succeeds it allocates
2741  the space for the return elements and returns the size needed to return the
2742  security descriptor. This should be the only external function needed for
2743  the UNIX style get ACL.
2744 ****************************************************************************/
2745
2746 size_t get_nt_acl(files_struct *fsp, uint32 security_info, SEC_DESC **ppdesc)
2747 {
2748         connection_struct *conn = fsp->conn;
2749         SMB_STRUCT_STAT sbuf;
2750         SEC_ACE *nt_ace_list = NULL;
2751         DOM_SID owner_sid;
2752         DOM_SID group_sid;
2753         size_t sd_size = 0;
2754         SEC_ACL *psa = NULL;
2755         size_t num_acls = 0;
2756         size_t num_def_acls = 0;
2757         size_t num_aces = 0;
2758         SMB_ACL_T posix_acl = NULL;
2759         SMB_ACL_T def_acl = NULL;
2760         canon_ace *file_ace = NULL;
2761         canon_ace *dir_ace = NULL;
2762         size_t num_profile_acls = 0;
2763         struct pai_val *pal = NULL;
2764         SEC_DESC *psd = NULL;
2765
2766         *ppdesc = NULL;
2767
2768         DEBUG(10,("get_nt_acl: called for file %s\n", fsp->fsp_name ));
2769
2770         if(fsp->is_directory || fsp->fh->fd == -1) {
2771
2772                 /* Get the stat struct for the owner info. */
2773                 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0) {
2774                         return 0;
2775                 }
2776                 /*
2777                  * Get the ACL from the path.
2778                  */
2779
2780                 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fsp->fsp_name, SMB_ACL_TYPE_ACCESS);
2781
2782                 /*
2783                  * If it's a directory get the default POSIX ACL.
2784                  */
2785
2786                 if(fsp->is_directory) {
2787                         def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fsp->fsp_name, SMB_ACL_TYPE_DEFAULT);
2788                         def_acl = free_empty_sys_acl(conn, def_acl);
2789                 }
2790
2791         } else {
2792
2793                 /* Get the stat struct for the owner info. */
2794                 if(SMB_VFS_FSTAT(fsp,fsp->fh->fd,&sbuf) != 0) {
2795                         return 0;
2796                 }
2797                 /*
2798                  * Get the ACL from the fd.
2799                  */
2800                 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fsp->fh->fd);
2801         }
2802
2803         DEBUG(5,("get_nt_acl : file ACL %s, directory ACL %s\n",
2804                         posix_acl ? "present" :  "absent",
2805                         def_acl ? "present" :  "absent" ));
2806
2807         pal = load_inherited_info(fsp);
2808
2809         /*
2810          * Get the owner, group and world SIDs.
2811          */
2812
2813         if (lp_profile_acls(SNUM(conn))) {
2814                 /* For WXP SP1 the owner must be administrators. */
2815                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
2816                 sid_copy(&group_sid, &global_sid_Builtin_Users);
2817                 num_profile_acls = 2;
2818         } else {
2819                 create_file_sids(&sbuf, &owner_sid, &group_sid);
2820         }
2821
2822         if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
2823
2824                 /*
2825                  * In the optimum case Creator Owner and Creator Group would be used for
2826                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
2827                  * would lead to usability problems under Windows: The Creator entries
2828                  * are only available in browse lists of directories and not for files;
2829                  * additionally the identity of the owning group couldn't be determined.
2830                  * We therefore use those identities only for Default ACLs.
2831                  */
2832
2833                 /* Create the canon_ace lists. */
2834                 file_ace = canonicalise_acl( fsp, posix_acl, &sbuf, &owner_sid, &group_sid, pal, SMB_ACL_TYPE_ACCESS );
2835
2836                 /* We must have *some* ACLS. */
2837
2838                 if (count_canon_ace_list(file_ace) == 0) {
2839                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", fsp->fsp_name ));
2840                         goto done;
2841                 }
2842
2843                 if (fsp->is_directory && def_acl) {
2844                         dir_ace = canonicalise_acl(fsp, def_acl, &sbuf,
2845                                         &global_sid_Creator_Owner,
2846                                         &global_sid_Creator_Group, pal, SMB_ACL_TYPE_DEFAULT );
2847                 }
2848
2849                 /*
2850                  * Create the NT ACE list from the canonical ace lists.
2851                  */
2852
2853                 {
2854                         canon_ace *ace;
2855                         int nt_acl_type;
2856                         int i;
2857
2858                         if (nt4_compatible_acls() && dir_ace) {
2859                                 /*
2860                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
2861                                  * but no non-INHERIT_ONLY entry for one SID. So we only
2862                                  * remove entries from the Access ACL if the
2863                                  * corresponding Default ACL entries have also been
2864                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
2865                                  * are exceptions. We can do nothing
2866                                  * intelligent if the Default ACL contains entries that
2867                                  * are not also contained in the Access ACL, so this
2868                                  * case will still fail under NT 4.
2869                                  */
2870
2871                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
2872                                 if (ace && !ace->perms) {
2873                                         DLIST_REMOVE(dir_ace, ace);
2874                                         SAFE_FREE(ace);
2875
2876                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
2877                                         if (ace && !ace->perms) {
2878                                                 DLIST_REMOVE(file_ace, ace);
2879                                                 SAFE_FREE(ace);
2880                                         }
2881                                 }
2882
2883                                 /*
2884                                  * WinNT doesn't usually have Creator Group
2885                                  * in browse lists, so we send this entry to
2886                                  * WinNT even if it contains no relevant
2887                                  * permissions. Once we can add
2888                                  * Creator Group to browse lists we can
2889                                  * re-enable this.
2890                                  */
2891
2892 #if 0
2893                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
2894                                 if (ace && !ace->perms) {
2895                                         DLIST_REMOVE(dir_ace, ace);
2896                                         SAFE_FREE(ace);
2897                                 }
2898 #endif
2899
2900                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
2901                                 if (ace && !ace->perms) {
2902                                         DLIST_REMOVE(file_ace, ace);
2903                                         SAFE_FREE(ace);
2904                                 }
2905                         }
2906
2907                         num_acls = count_canon_ace_list(file_ace);
2908                         num_def_acls = count_canon_ace_list(dir_ace);
2909
2910                         /* Allocate the ace list. */
2911                         if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
2912                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
2913                                 goto done;
2914                         }
2915
2916                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
2917
2918                         /*
2919                          * Create the NT ACE list from the canonical ace lists.
2920                          */
2921
2922                         ace = file_ace;
2923
2924                         for (i = 0; i < num_acls; i++, ace = ace->next) {
2925                                 SEC_ACCESS acc;
2926
2927                                 acc = map_canon_ace_perms(SNUM(conn),
2928                                                 &nt_acl_type,
2929                                                 ace->perms,
2930                                                 fsp->is_directory);
2931                                 init_sec_ace(&nt_ace_list[num_aces++],
2932                                         &ace->trustee,
2933                                         nt_acl_type,
2934                                         acc,
2935                                         ace->inherited ?
2936                                                 SEC_ACE_FLAG_INHERITED_ACE : 0);
2937                         }
2938
2939                         /* The User must have access to a profile share - even
2940                          * if we can't map the SID. */
2941                         if (lp_profile_acls(SNUM(conn))) {
2942                                 SEC_ACCESS acc;
2943
2944                                 init_sec_access(&acc,FILE_GENERIC_ALL);
2945                                 init_sec_ace(&nt_ace_list[num_aces++],
2946                                                 &global_sid_Builtin_Users,
2947                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
2948                                                 acc, 0);
2949                         }
2950
2951                         ace = dir_ace;
2952
2953                         for (i = 0; i < num_def_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                                                 fsp->is_directory);
2960                                 init_sec_ace(&nt_ace_list[num_aces++],
2961                                         &ace->trustee,
2962                                         nt_acl_type,
2963                                         acc,
2964                                         SEC_ACE_FLAG_OBJECT_INHERIT|
2965                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
2966                                         SEC_ACE_FLAG_INHERIT_ONLY|
2967                                         (ace->inherited ?
2968                                            SEC_ACE_FLAG_INHERITED_ACE : 0));
2969                         }
2970
2971                         /* The User must have access to a profile share - even
2972                          * if we can't map the SID. */
2973                         if (lp_profile_acls(SNUM(conn))) {
2974                                 SEC_ACCESS acc;
2975
2976                                 init_sec_access(&acc,FILE_GENERIC_ALL);
2977                                 init_sec_ace(&nt_ace_list[num_aces++], &global_sid_Builtin_Users, SEC_ACE_TYPE_ACCESS_ALLOWED, acc,
2978                                                 SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2979                                                 SEC_ACE_FLAG_INHERIT_ONLY|0);
2980                         }
2981
2982                         /*
2983                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
2984                          * Win2K needs this to get the inheritance correct when replacing ACLs
2985                          * on a directory tree. Based on work by Jim @ IBM.
2986                          */
2987
2988                         num_aces = merge_default_aces(nt_ace_list, num_aces);
2989
2990                 }
2991
2992                 if (num_aces) {
2993                         if((psa = make_sec_acl( main_loop_talloc_get(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
2994                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
2995                                 goto done;
2996                         }
2997                 }
2998         } /* security_info & DACL_SECURITY_INFORMATION */
2999
3000         psd = make_standard_sec_desc( main_loop_talloc_get(),
3001                         (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3002                         (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3003                         psa,
3004                         &sd_size);
3005
3006         if(!psd) {
3007                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3008                 sd_size = 0;
3009                 goto done;
3010         }
3011
3012         /*
3013          * Windows 2000: The DACL_PROTECTED flag in the security
3014          * descriptor marks the ACL as non-inheriting, i.e., no
3015          * ACEs from higher level directories propagate to this
3016          * ACL. In the POSIX ACL model permissions are only
3017          * inherited at file create time, so ACLs never contain
3018          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3019          * flag doesn't seem to bother Windows NT.
3020          * Always set this if map acl inherit is turned off.
3021          */
3022         if (get_protected_flag(pal) || !lp_map_acl_inherit(SNUM(conn))) {
3023                 psd->type |= SE_DESC_DACL_PROTECTED;
3024         }
3025
3026         if (psd->dacl) {
3027                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3028         }
3029
3030         *ppdesc = psd;
3031
3032  done:
3033
3034         if (posix_acl) {
3035                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3036         }
3037         if (def_acl) {
3038                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3039         }
3040         free_canon_ace_list(file_ace);
3041         free_canon_ace_list(dir_ace);
3042         free_inherited_info(pal);
3043         SAFE_FREE(nt_ace_list);
3044
3045         return sd_size;
3046 }
3047
3048 /****************************************************************************
3049  Try to chown a file. We will be able to chown it under the following conditions.
3050
3051   1) If we have root privileges, then it will just work.
3052   2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3053   3) If we have SeRestorePrivilege we can change the user to any other user.
3054   4) If we have write permission to the file and dos_filemodes is set
3055      then allow chown to the currently authenticated user.
3056 ****************************************************************************/
3057
3058 int try_chown(connection_struct *conn, const char *fname, uid_t uid, gid_t gid)
3059 {
3060         int ret;
3061         files_struct *fsp;
3062         SMB_STRUCT_STAT st;
3063
3064         if(!CAN_WRITE(conn)) {
3065                 return -1;
3066         }
3067
3068         /* Case (1). */
3069         /* try the direct way first */
3070         ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
3071         if (ret == 0)
3072                 return 0;
3073
3074         /* Case (2) / (3) */
3075         if (lp_enable_privileges()) {
3076
3077                 BOOL has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3078                                                               &se_take_ownership);
3079                 BOOL has_restore_priv = user_has_privileges(current_user.nt_user_token,
3080                                                        &se_restore);
3081
3082                 /* Case (2) */
3083                 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3084                 /* Case (3) */
3085                      ( has_restore_priv ) ) {
3086
3087                         become_root();
3088                         /* Keep the current file gid the same - take ownership doesn't imply group change. */
3089                         ret = SMB_VFS_CHOWN(conn, fname, uid, (gid_t)-1);
3090                         unbecome_root();
3091                         return ret;
3092                 }
3093         }
3094
3095         /* Case (4). */
3096         if (!lp_dos_filemode(SNUM(conn))) {
3097                 return -1;
3098         }
3099
3100         /* only allow chown to the current user. This is more secure,
3101            and also copes with the case where the SID in a take ownership ACL is
3102            a local SID on the users workstation
3103         */
3104         if (uid != current_user.ut.uid) {
3105                 errno = EPERM;
3106                 return -1;
3107         }
3108
3109         if (SMB_VFS_STAT(conn,fname,&st)) {
3110                 return -1;
3111         }
3112
3113         if (!NT_STATUS_IS_OK(open_file_fchmod(conn,fname,&st,&fsp))) {
3114                 return -1;
3115         }
3116
3117         become_root();
3118         /* Keep the current file gid the same. */
3119         ret = SMB_VFS_FCHOWN(fsp, fsp->fh->fd, uid, (gid_t)-1);
3120         unbecome_root();
3121
3122         close_file_fchmod(fsp);
3123
3124         return ret;
3125 }
3126
3127 #if 0
3128 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3129
3130 /****************************************************************************
3131  Take care of parent ACL inheritance.
3132 ****************************************************************************/
3133
3134 static NTSTATUS append_parent_acl(files_struct *fsp,
3135                                 SMB_STRUCT_STAT *psbuf,
3136                                 SEC_DESC *psd,
3137                                 SEC_DESC **pp_new_sd)
3138 {
3139         SEC_DESC *parent_sd = NULL;
3140         files_struct *parent_fsp = NULL;
3141         TALLOC_CTX *mem_ctx = talloc_parent(psd);
3142         char *parent_name = NULL;
3143         SEC_ACE *new_ace = NULL;
3144         unsigned int num_aces = psd->dacl->num_aces;
3145         SMB_STRUCT_STAT sbuf;
3146         NTSTATUS status;
3147         int info;
3148         size_t sd_size;
3149         unsigned int i, j;
3150         BOOL is_dacl_protected = (psd->type & SE_DESC_DACL_PROTECTED);
3151
3152         ZERO_STRUCT(sbuf);
3153
3154         if (mem_ctx == NULL) {
3155                 return NT_STATUS_NO_MEMORY;
3156         }
3157
3158         if (!parent_dirname_talloc(mem_ctx,
3159                                 fsp->fsp_name,
3160                                 &parent_name,
3161                                 NULL)) {
3162                 return NT_STATUS_NO_MEMORY;
3163         }
3164
3165         status = open_directory(fsp->conn,
3166                                 parent_name,
3167                                 &sbuf,
3168                                 FILE_READ_ATTRIBUTES, /* Just a stat open */
3169                                 FILE_SHARE_NONE, /* Ignored for stat opens */
3170                                 FILE_OPEN,
3171                                 0,
3172                                 0,
3173                                 &info,
3174                                 &parent_fsp);
3175
3176         if (!NT_STATUS_IS_OK(status)) {
3177                 return status;
3178         }
3179
3180         sd_size = SMB_VFS_GET_NT_ACL(parent_fsp, parent_fsp->fsp_name,
3181                         DACL_SECURITY_INFORMATION, &parent_sd );
3182
3183         close_file(parent_fsp, NORMAL_CLOSE);
3184
3185         if (!sd_size) {
3186                 return NT_STATUS_ACCESS_DENIED;
3187         }
3188
3189         /*
3190          * Make room for potentially all the ACLs from
3191          * the parent. We used to add the ugw triple here,
3192          * as we knew we were dealing with POSIX ACLs.
3193          * We no longer need to do so as we can guarentee
3194          * that a default ACL from the parent directory will
3195          * be well formed for POSIX ACLs if it came from a
3196          * POSIX ACL source, and if we're not writing to a
3197          * POSIX ACL sink then we don't care if it's not well
3198          * formed. JRA.
3199          */
3200
3201         num_aces += parent_sd->dacl->num_aces;
3202
3203         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3204                                         num_aces)) == NULL) {
3205                 return NT_STATUS_NO_MEMORY;
3206         }
3207
3208         /* Start by copying in all the given ACE entries. */
3209         for (i = 0; i < psd->dacl->num_aces; i++) {
3210                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3211         }
3212
3213         /*
3214          * Note that we're ignoring "inherit permissions" here
3215          * as that really only applies to newly created files. JRA.
3216          */
3217
3218         /* Finally append any inherited ACEs. */
3219         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3220                 SEC_ACE *se = &parent_sd->dacl->aces[j];
3221
3222                 if (fsp->is_directory) {
3223                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3224                                 /* Doesn't apply to a directory - ignore. */
3225                                 DEBUG(10,("append_parent_acl: directory %s "
3226                                         "ignoring non container "
3227                                         "inherit flags %u on ACE with sid %s "
3228                                         "from parent %s\n",
3229                                         fsp->fsp_name,
3230                                         (unsigned int)se->flags,
3231                                         sid_string_static(&se->trustee),
3232                                         parent_name));
3233                                 continue;
3234                         }
3235                 } else {
3236                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3237                                 /* Doesn't apply to a file - ignore. */
3238                                 DEBUG(10,("append_parent_acl: file %s "
3239                                         "ignoring non object "
3240                                         "inherit flags %u on ACE with sid %s "
3241                                         "from parent %s\n",
3242                                         fsp->fsp_name,
3243                                         (unsigned int)se->flags,
3244                                         sid_string_static(&se->trustee),
3245                                         parent_name));
3246                                 continue;
3247                         }
3248                 }
3249
3250                 if (is_dacl_protected) {
3251                         /* If the DACL is protected it means we must
3252                          * not overwrite an existing ACE entry with the
3253                          * same SID. This is order N^2. Ouch :-(. JRA. */
3254                         unsigned int k;
3255                         for (k = 0; k < psd->dacl->num_aces; k++) {
3256                                 if (sid_equal(&psd->dacl->aces[k].trustee,
3257                                                 &se->trustee)) {
3258                                         break;
3259                                 }
3260                         }
3261                         if (k < psd->dacl->num_aces) {
3262                                 /* SID matched. Ignore. */
3263                                 DEBUG(10,("append_parent_acl: path %s "
3264                                         "ignoring ACE with protected sid %s "
3265                                         "from parent %s\n",
3266                                         fsp->fsp_name,
3267                                         sid_string_static(&se->trustee),
3268                                         parent_name));
3269                                 continue;
3270                         }
3271                 }
3272
3273                 sec_ace_copy(&new_ace[i], se);
3274                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3275                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3276                 }
3277                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3278
3279                 if (fsp->is_directory) {
3280                         /*
3281                          * Strip off any inherit only. It's applied.
3282                          */
3283                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3284                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3285                                 /* No further inheritance. */
3286                                 new_ace[i].flags &=
3287                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3288                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3289                         }
3290                 } else {
3291                         /*
3292                          * Strip off any container or inherit
3293                          * flags, they can't apply to objects.
3294                          */
3295                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3296                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3297                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3298                 }
3299
3300                 i++;
3301
3302                 DEBUG(10,("append_parent_acl: path %s "
3303                         "inheriting ACE with sid %s "
3304                         "from parent %s\n",
3305                         fsp->fsp_name,
3306                         sid_string_static(&se->trustee),
3307                         parent_name));
3308
3309         }
3310
3311         /* This sucks. psd should be const and we should
3312          * be doing a deep-copy here. We're getting away
3313          * with is as we know parent_sd is talloced off
3314          * talloc_tos() as well as psd. JRA. */
3315
3316         psd->dacl->aces = new_ace;
3317         psd->dacl->num_aces = i;
3318         psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3319                          SE_DESC_DACL_AUTO_INHERIT_REQ);
3320
3321         *pp_new_sd = psd;
3322         return status;
3323 }
3324 #endif
3325
3326 /****************************************************************************
3327  Reply to set a security descriptor on an fsp. security_info_sent is the
3328  description of the following NT ACL.
3329  This should be the only external function needed for the UNIX style set ACL.
3330 ****************************************************************************/
3331
3332 BOOL set_nt_acl(files_struct *fsp, uint32 security_info_sent, SEC_DESC *psd)
3333 {
3334         connection_struct *conn = fsp->conn;
3335         uid_t user = (uid_t)-1;
3336         gid_t grp = (gid_t)-1;
3337         SMB_STRUCT_STAT sbuf;
3338         DOM_SID file_owner_sid;
3339         DOM_SID file_grp_sid;
3340         canon_ace *file_ace_list = NULL;
3341         canon_ace *dir_ace_list = NULL;
3342         BOOL acl_perms = False;
3343         mode_t orig_mode = (mode_t)0;
3344         BOOL set_acl_as_root = false;
3345         BOOL acl_set_support = false;
3346         BOOL ret = false;
3347
3348         DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
3349
3350         if (!CAN_WRITE(conn)) {
3351                 DEBUG(10,("set acl rejected on read-only share\n"));
3352                 return False;
3353         }
3354
3355         /*
3356          * Get the current state of the file.
3357          */
3358
3359         if(fsp->is_directory || fsp->fh->fd == -1) {
3360                 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0)
3361                         return False;
3362         } else {
3363                 if(SMB_VFS_FSTAT(fsp,fsp->fh->fd,&sbuf) != 0)
3364                         return False;
3365         }
3366
3367         /* Save the original elements we check against. */
3368         orig_mode = sbuf.st_mode;
3369
3370         /*
3371          * Unpack the user/group/world id's.
3372          */
3373
3374         if (!unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd)) {
3375                 return False;
3376         }
3377
3378         /*
3379          * Do we need to chown ?
3380          */
3381
3382         if (((user != (uid_t)-1) && (sbuf.st_uid != user)) || (( grp != (gid_t)-1) && (sbuf.st_gid != grp))) {
3383
3384                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3385                                 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3386
3387                 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3388                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3389                                 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3390                         return False;
3391                 }
3392
3393                 /*
3394                  * Recheck the current state of the file, which may have changed.
3395                  * (suid/sgid bits, for instance)
3396                  */
3397
3398                 if(fsp->is_directory) {
3399                         if(SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
3400                                 return False;
3401                         }
3402                 } else {
3403
3404                         int sret;
3405
3406                         if(fsp->fh->fd == -1)
3407                                 sret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf);
3408                         else
3409                                 sret = SMB_VFS_FSTAT(fsp,fsp->fh->fd,&sbuf);
3410
3411                         if(sret != 0)
3412                                 return False;
3413                 }
3414
3415                 /* Save the original elements we check against. */
3416                 orig_mode = sbuf.st_mode;
3417
3418                 /* If we successfully chowned, we know we must
3419                  * be able to set the acl, so do it as root.
3420                  */
3421                 set_acl_as_root = true;
3422         }
3423
3424         create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3425
3426         acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3427                                         &file_ace_list, &dir_ace_list, security_info_sent, psd);
3428
3429         /* Ignore W2K traverse DACL set. */
3430         if (!file_ace_list && !dir_ace_list) {
3431                 return True;
3432         }
3433
3434         if (!acl_perms) {
3435                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3436                 free_canon_ace_list(file_ace_list);
3437                 free_canon_ace_list(dir_ace_list);
3438                 return False;
3439         }
3440
3441         /*
3442          * Only change security if we got a DACL.
3443          */
3444
3445         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3446                 free_canon_ace_list(file_ace_list);
3447                 free_canon_ace_list(dir_ace_list);
3448                 return True;
3449         }
3450
3451         /*
3452          * Try using the POSIX ACL set first. Fall back to chmod if
3453          * we have no ACL support on this filesystem.
3454          */
3455
3456         if (acl_perms && file_ace_list) {
3457                 if (set_acl_as_root) {
3458                         become_root();
3459                 }
3460                 ret = set_canon_ace_list(fsp, file_ace_list, False, sbuf.st_gid, &acl_set_support);
3461                 if (set_acl_as_root) {
3462                         unbecome_root();
3463                 }
3464                 if (acl_set_support && ret == False) {
3465                         DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3466                         free_canon_ace_list(file_ace_list);
3467                         free_canon_ace_list(dir_ace_list);
3468                         return False;
3469                 }
3470         }
3471
3472         if (acl_perms && acl_set_support && fsp->is_directory) {
3473                 if (dir_ace_list) {
3474                         if (set_acl_as_root) {
3475                                 become_root();
3476                         }
3477                         ret = set_canon_ace_list(fsp, dir_ace_list, True, sbuf.st_gid, &acl_set_support);
3478                         if (set_acl_as_root) {
3479                                 unbecome_root();
3480                         }
3481                         if (ret == False) {
3482                                 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3483                                 free_canon_ace_list(file_ace_list);
3484                                 free_canon_ace_list(dir_ace_list);
3485                                 return False;
3486                         }
3487                 } else {
3488
3489                         int sret = -1;
3490
3491                         /*
3492                          * No default ACL - delete one if it exists.
3493                          */
3494
3495                         if (set_acl_as_root) {
3496                                 become_root();
3497                         }
3498                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3499                         if (set_acl_as_root) {
3500                                 unbecome_root();
3501                         }
3502
3503                         if (sret == -1) {
3504                                 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3505                                         DEBUG(5,("set_nt_acl: acl group control on and "
3506                                                 "current user in file %s primary group. Override delete_def_acl\n",
3507                                                 fsp->fsp_name ));
3508
3509                                         become_root();
3510                                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3511                                         unbecome_root();
3512                                 }
3513
3514                                 if (sret == -1) {
3515                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3516                                         free_canon_ace_list(file_ace_list);
3517                                         free_canon_ace_list(dir_ace_list);
3518                                         return False;
3519                                 }
3520                         }
3521                 }
3522         }
3523
3524         if (acl_set_support) {
3525                 if (set_acl_as_root) {
3526                         become_root();
3527                 }
3528                 store_inheritance_attributes(fsp, file_ace_list, dir_ace_list,
3529                                 (psd->type & SE_DESC_DACL_PROTECTED) ? True : False);
3530                 if (set_acl_as_root) {
3531                         unbecome_root();
3532                 }
3533         }
3534
3535         /*
3536          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3537          */
3538
3539         if(!acl_set_support && acl_perms) {
3540                 mode_t posix_perms;
3541
3542                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3543                         free_canon_ace_list(file_ace_list);
3544                         free_canon_ace_list(dir_ace_list);
3545                         DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3546                                 fsp->fsp_name ));
3547                         return False;
3548                 }
3549
3550                 if (orig_mode != posix_perms) {
3551                         int sret = -1;
3552
3553                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3554                                 fsp->fsp_name, (unsigned int)posix_perms ));
3555
3556                         if (set_acl_as_root) {
3557                                 become_root();
3558                         }
3559                         sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3560                         if (set_acl_as_root) {
3561                                 unbecome_root();
3562                         }
3563                         if(sret == -1) {
3564                                 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3565                                         DEBUG(5,("set_nt_acl: acl group control on and "
3566                                                 "current user in file %s primary group. Override chmod\n",
3567                                                 fsp->fsp_name ));
3568
3569                                         become_root();
3570                                         sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3571                                         unbecome_root();
3572                                 }
3573
3574                                 if (sret == -1) {
3575                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3576                                                 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3577                                         free_canon_ace_list(file_ace_list);
3578                                         free_canon_ace_list(dir_ace_list);
3579                                         return False;
3580                                 }
3581                         }
3582                 }
3583         }
3584
3585         free_canon_ace_list(file_ace_list);
3586         free_canon_ace_list(dir_ace_list);
3587         return True;
3588 }
3589
3590 /****************************************************************************
3591  Get the actual group bits stored on a file with an ACL. Has no effect if
3592  the file has no ACL. Needed in dosmode code where the stat() will return
3593  the mask bits, not the real group bits, for a file with an ACL.
3594 ****************************************************************************/
3595
3596 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3597 {
3598         int entry_id = SMB_ACL_FIRST_ENTRY;
3599         SMB_ACL_ENTRY_T entry;
3600         SMB_ACL_T posix_acl;
3601         int result = -1;
3602
3603         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3604         if (posix_acl == (SMB_ACL_T)NULL)
3605                 return -1;
3606
3607         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3608                 SMB_ACL_TAG_T tagtype;
3609                 SMB_ACL_PERMSET_T permset;
3610
3611                 /* get_next... */
3612                 if (entry_id == SMB_ACL_FIRST_ENTRY)
3613                         entry_id = SMB_ACL_NEXT_ENTRY;
3614
3615                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3616                         break;
3617
3618                 if (tagtype == SMB_ACL_GROUP_OBJ) {
3619                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3620                                 break;
3621                         } else {
3622                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
3623                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3624                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3625                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3626                                 result = 0;
3627                                 break;
3628                         }
3629                 }
3630         }
3631         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3632         return result;
3633 }
3634
3635 /****************************************************************************
3636  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3637  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3638 ****************************************************************************/
3639
3640 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
3641 {
3642         int entry_id = SMB_ACL_FIRST_ENTRY;
3643         SMB_ACL_ENTRY_T entry;
3644         int num_entries = 0;
3645
3646         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3647                 SMB_ACL_TAG_T tagtype;
3648                 SMB_ACL_PERMSET_T permset;
3649                 mode_t perms;
3650
3651                 /* get_next... */
3652                 if (entry_id == SMB_ACL_FIRST_ENTRY)
3653                         entry_id = SMB_ACL_NEXT_ENTRY;
3654
3655                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
3656                         return -1;
3657
3658                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
3659                         return -1;
3660
3661                 num_entries++;
3662
3663                 switch(tagtype) {
3664                         case SMB_ACL_USER_OBJ:
3665                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
3666                                 break;
3667                         case SMB_ACL_GROUP_OBJ:
3668                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
3669                                 break;
3670                         case SMB_ACL_MASK:
3671                                 /*
3672                                  * FIXME: The ACL_MASK entry permissions should really be set to
3673                                  * the union of the permissions of all ACL_USER,
3674                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
3675                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
3676                                  */
3677                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
3678                                 break;
3679                         case SMB_ACL_OTHER:
3680                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
3681                                 break;
3682                         default:
3683                                 continue;
3684                 }
3685
3686                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
3687                         return -1;
3688
3689                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
3690                         return -1;
3691         }
3692
3693         /*
3694          * If this is a simple 3 element ACL or no elements then it's a standard
3695          * UNIX permission set. Just use chmod...
3696          */
3697
3698         if ((num_entries == 3) || (num_entries == 0))
3699                 return -1;
3700
3701         return 0;
3702 }
3703
3704 /****************************************************************************
3705  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
3706  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
3707  resulting ACL on TO.  Note that name is in UNIX character set.
3708 ****************************************************************************/
3709
3710 static int copy_access_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
3711 {
3712         SMB_ACL_T posix_acl = NULL;
3713         int ret = -1;
3714
3715         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
3716                 return -1;
3717
3718         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3719                 goto done;
3720
3721         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
3722
3723  done:
3724
3725         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3726         return ret;
3727 }
3728
3729 /****************************************************************************
3730  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3731  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3732  Note that name is in UNIX character set.
3733 ****************************************************************************/
3734
3735 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
3736 {
3737         return copy_access_acl(conn, name, name, mode);
3738 }
3739
3740 /****************************************************************************
3741  If the parent directory has no default ACL but it does have an Access ACL,
3742  inherit this Access ACL to file name.
3743 ****************************************************************************/
3744
3745 int inherit_access_acl(connection_struct *conn, const char *inherit_from_dir,
3746                        const char *name, mode_t mode)
3747 {
3748         if (directory_has_default_acl(conn, inherit_from_dir))
3749                 return 0;
3750
3751         return copy_access_acl(conn, inherit_from_dir, name, mode);
3752 }
3753
3754 /****************************************************************************
3755  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3756  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3757 ****************************************************************************/
3758
3759 int fchmod_acl(files_struct *fsp, int fd, mode_t mode)
3760 {
3761         connection_struct *conn = fsp->conn;
3762         SMB_ACL_T posix_acl = NULL;
3763         int ret = -1;
3764
3765         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fd)) == NULL)
3766                 return -1;
3767
3768         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3769                 goto done;
3770
3771         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, fd, posix_acl);
3772
3773   done:
3774
3775         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3776         return ret;
3777 }
3778
3779 /****************************************************************************
3780  Check for an existing default POSIX ACL on a directory.
3781 ****************************************************************************/
3782
3783 BOOL directory_has_default_acl(connection_struct *conn, const char *fname)
3784 {
3785         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
3786         BOOL has_acl = False;
3787         SMB_ACL_ENTRY_T entry;
3788
3789         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
3790                 has_acl = True;
3791         }
3792
3793         if (def_acl) {
3794                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3795         }
3796         return has_acl;
3797 }
3798
3799 /****************************************************************************
3800  Map from wire type to permset.
3801 ****************************************************************************/
3802
3803 static BOOL unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
3804 {
3805         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
3806                 return False;
3807         }
3808
3809         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
3810                 return False;
3811         }
3812
3813         if (wire_perm & SMB_POSIX_ACL_READ) {
3814                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
3815                         return False;
3816                 }
3817         }
3818         if (wire_perm & SMB_POSIX_ACL_WRITE) {
3819                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
3820                         return False;
3821                 }
3822         }
3823         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
3824                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
3825                         return False;
3826                 }
3827         }
3828         return True;
3829 }
3830
3831 /****************************************************************************
3832  Map from wire type to tagtype.
3833 ****************************************************************************/
3834
3835 static BOOL unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
3836 {
3837         switch (wire_tt) {
3838                 case SMB_POSIX_ACL_USER_OBJ:
3839                         *p_tt = SMB_ACL_USER_OBJ;
3840                         break;
3841                 case SMB_POSIX_ACL_USER:
3842                         *p_tt = SMB_ACL_USER;
3843                         break;
3844                 case SMB_POSIX_ACL_GROUP_OBJ:
3845                         *p_tt = SMB_ACL_GROUP_OBJ;
3846                         break;
3847                 case SMB_POSIX_ACL_GROUP:
3848                         *p_tt = SMB_ACL_GROUP;
3849                         break;
3850                 case SMB_POSIX_ACL_MASK:
3851                         *p_tt = SMB_ACL_MASK;
3852                         break;
3853                 case SMB_POSIX_ACL_OTHER:
3854                         *p_tt = SMB_ACL_OTHER;
3855                         break;
3856                 default:
3857                         return False;
3858         }
3859         return True;
3860 }
3861
3862 /****************************************************************************
3863  Create a new POSIX acl from wire permissions.
3864  FIXME ! How does the share mask/mode fit into this.... ?
3865 ****************************************************************************/
3866
3867 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
3868 {
3869         unsigned int i;
3870         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
3871
3872         if (the_acl == NULL) {
3873                 return NULL;
3874         }
3875
3876         for (i = 0; i < num_acls; i++) {
3877                 SMB_ACL_ENTRY_T the_entry;
3878                 SMB_ACL_PERMSET_T the_permset;
3879                 SMB_ACL_TAG_T tag_type;
3880
3881                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
3882                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
3883                                 i, strerror(errno) ));
3884                         goto fail;
3885                 }
3886
3887                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
3888                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
3889                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
3890                         goto fail;
3891                 }
3892
3893                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
3894                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
3895                                 i, strerror(errno) ));
3896                         goto fail;
3897                 }
3898
3899                 /* Get the permset pointer from the new ACL entry. */
3900                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
3901                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
3902                                 i, strerror(errno) ));
3903                         goto fail;
3904                 }
3905
3906                 /* Map from wire to permissions. */
3907                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
3908                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
3909                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
3910                         goto fail;
3911                 }
3912
3913                 /* Now apply to the new ACL entry. */
3914                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
3915                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
3916                                 i, strerror(errno) ));
3917                         goto fail;
3918                 }
3919
3920                 if (tag_type == SMB_ACL_USER) {
3921                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
3922                         uid_t uid = (uid_t)uidval;
3923                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
3924                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
3925                                         (unsigned int)uid, i, strerror(errno) ));
3926                                 goto fail;
3927                         }
3928                 }
3929
3930                 if (tag_type == SMB_ACL_GROUP) {
3931                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
3932                         gid_t gid = (uid_t)gidval;
3933                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
3934                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
3935                                         (unsigned int)gid, i, strerror(errno) ));
3936                                 goto fail;
3937                         }
3938                 }
3939         }
3940
3941         return the_acl;
3942
3943  fail:
3944
3945         if (the_acl != NULL) {
3946                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
3947         }
3948         return NULL;
3949 }
3950
3951 /****************************************************************************
3952  Calls from UNIX extensions - Default POSIX ACL set.
3953  If num_def_acls == 0 and not a directory just return. If it is a directory
3954  and num_def_acls == 0 then remove the default acl. Else set the default acl
3955  on the directory.
3956 ****************************************************************************/
3957
3958 BOOL set_unix_posix_default_acl(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
3959                                 uint16 num_def_acls, const char *pdata)
3960 {
3961         SMB_ACL_T def_acl = NULL;
3962
3963         if (num_def_acls && !S_ISDIR(psbuf->st_mode)) {
3964                 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
3965                 errno = EISDIR;
3966                 return False;
3967         }
3968
3969         if (!num_def_acls) {
3970                 /* Remove the default ACL. */
3971                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
3972                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
3973                                 fname, strerror(errno) ));
3974                         return False;
3975                 }
3976                 return True;
3977         }
3978
3979         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
3980                 return False;
3981         }
3982
3983         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
3984                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
3985                         fname, strerror(errno) ));
3986                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3987                 return False;
3988         }
3989
3990         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
3991         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3992         return True;
3993 }
3994
3995 /****************************************************************************
3996  Remove an ACL from a file. As we don't have acl_delete_entry() available
3997  we must read the current acl and copy all entries except MASK, USER and GROUP
3998  to a new acl, then set that. This (at least on Linux) causes any ACL to be
3999  removed.
4000  FIXME ! How does the share mask/mode fit into this.... ?
4001 ****************************************************************************/
4002
4003 static BOOL remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4004 {
4005         SMB_ACL_T file_acl = NULL;
4006         int entry_id = SMB_ACL_FIRST_ENTRY;
4007         SMB_ACL_ENTRY_T entry;
4008         BOOL ret = False;
4009         /* Create a new ACL with only 3 entries, u/g/w. */
4010         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4011         SMB_ACL_ENTRY_T user_ent = NULL;
4012         SMB_ACL_ENTRY_T group_ent = NULL;
4013         SMB_ACL_ENTRY_T other_ent = NULL;
4014
4015         if (new_file_acl == NULL) {
4016                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4017                 return False;
4018         }
4019
4020         /* Now create the u/g/w entries. */
4021         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4022                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4023                         fname, strerror(errno) ));
4024                 goto done;
4025         }
4026         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4027                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4028                         fname, strerror(errno) ));
4029                 goto done;
4030         }
4031
4032         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4033                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4034                         fname, strerror(errno) ));
4035                 goto done;
4036         }
4037         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4038                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4039                         fname, strerror(errno) ));
4040                 goto done;
4041         }
4042
4043         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4044                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4045                         fname, strerror(errno) ));
4046                 goto done;
4047         }
4048         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4049                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4050                         fname, strerror(errno) ));
4051                 goto done;
4052         }
4053
4054         /* Get the current file ACL. */
4055         if (fsp && fsp->fh->fd != -1) {
4056                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fsp->fh->fd);
4057         } else {
4058                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4059         }
4060
4061         if (file_acl == NULL) {
4062                 /* This is only returned if an error occurred. Even for a file with
4063                    no acl a u/g/w acl should be returned. */
4064                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4065                         fname, strerror(errno) ));
4066                 goto done;
4067         }
4068
4069         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4070                 SMB_ACL_TAG_T tagtype;
4071                 SMB_ACL_PERMSET_T permset;
4072
4073                 /* get_next... */
4074                 if (entry_id == SMB_ACL_FIRST_ENTRY)
4075                         entry_id = SMB_ACL_NEXT_ENTRY;
4076
4077                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4078                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4079                                 fname, strerror(errno) ));
4080                         goto done;
4081                 }
4082
4083                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4084                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4085                                 fname, strerror(errno) ));
4086                         goto done;
4087                 }
4088
4089                 if (tagtype == SMB_ACL_USER_OBJ) {
4090                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4091                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4092                                         fname, strerror(errno) ));
4093                         }
4094                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4095                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4096                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4097                                         fname, strerror(errno) ));
4098                         }
4099                 } else if (tagtype == SMB_ACL_OTHER) {
4100                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4101                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4102                                         fname, strerror(errno) ));
4103                         }
4104                 }
4105         }
4106
4107         /* Set the new empty file ACL. */
4108         if (fsp && fsp->fh->fd != -1) {
4109                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, new_file_acl) == -1) {
4110                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4111                                 fname, strerror(errno) ));
4112                         goto done;
4113                 }
4114         } else {
4115                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4116                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4117                                 fname, strerror(errno) ));
4118                         goto done;
4119                 }
4120         }
4121
4122         ret = True;
4123
4124  done:
4125
4126         if (file_acl) {
4127                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4128         }
4129         if (new_file_acl) {
4130                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4131         }
4132         return ret;
4133 }
4134
4135 /****************************************************************************
4136  Calls from UNIX extensions - POSIX ACL set.
4137  If num_def_acls == 0 then read/modify/write acl after removing all entries
4138  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4139 ****************************************************************************/
4140
4141 BOOL set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4142 {
4143         SMB_ACL_T file_acl = NULL;
4144
4145         if (!num_acls) {
4146                 /* Remove the ACL from the file. */
4147                 return remove_posix_acl(conn, fsp, fname);
4148         }
4149
4150         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4151                 return False;
4152         }
4153
4154         if (fsp && fsp->fh->fd != -1) {
4155                 /* The preferred way - use an open fd. */
4156                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, file_acl) == -1) {
4157                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4158                                 fname, strerror(errno) ));
4159                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4160                         return False;
4161                 }
4162         } else {
4163                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4164                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4165                                 fname, strerror(errno) ));
4166                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4167                         return False;
4168                 }
4169         }
4170
4171         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4172         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4173         return True;
4174 }
4175
4176 /****************************************************************************
4177  Helper function that gets a security descriptor by connection and
4178  file name.
4179  NOTE: This is transitional, in the sense that SMB_VFS_GET_NT_ACL really
4180  should *not* get a files_struct pointer but a connection_struct ptr
4181  (automatic by the vfs handle) and the file name and _use_ that!
4182 ****************************************************************************/
4183 static NTSTATUS conn_get_nt_acl(TALLOC_CTX *mem_ctx,
4184                                 struct connection_struct *conn,
4185                                 const char *fname,
4186                                 SMB_STRUCT_STAT *psbuf,
4187                                 struct security_descriptor_info **psd)
4188 {
4189         NTSTATUS status;
4190         struct files_struct *fsp = NULL;
4191         struct security_descriptor_info *secdesc = NULL;
4192         size_t secdesc_size;
4193
4194         if (!VALID_STAT(*psbuf)) {
4195                 if (SMB_VFS_STAT(conn, fname, psbuf) != 0) {
4196                         return map_nt_error_from_unix(errno);
4197                 }
4198         }
4199
4200         /* fake a files_struct ptr: */
4201
4202         if (S_ISDIR(psbuf->st_mode)) {
4203                 status = open_directory(conn, fname, psbuf,
4204                                         READ_CONTROL_ACCESS,
4205                                         FILE_SHARE_READ|FILE_SHARE_WRITE,
4206                                         FILE_OPEN,
4207                                         0,
4208                                         FILE_ATTRIBUTE_DIRECTORY,
4209                                         NULL, &fsp);
4210         }
4211         else {
4212                 status = open_file_stat(conn, fname, psbuf, &fsp);
4213         }
4214
4215         if (!NT_STATUS_IS_OK(status)) {
4216                 DEBUG(3, ("Unable to open file %s: %s\n", fname,
4217                           nt_errstr(status)));
4218                 return status;
4219         }
4220
4221         secdesc_size = SMB_VFS_GET_NT_ACL(fsp, fname,
4222                                           (OWNER_SECURITY_INFORMATION |
4223                                            GROUP_SECURITY_INFORMATION |
4224                                            DACL_SECURITY_INFORMATION),
4225                                           &secdesc);
4226         if (secdesc_size == 0) {
4227                 DEBUG(5, ("Unable to get NT ACL for file %s\n", fname));
4228                 status = NT_STATUS_ACCESS_DENIED;
4229                 goto done;
4230         }
4231
4232         *psd = talloc_move(mem_ctx, &secdesc);
4233         status = NT_STATUS_OK;
4234
4235 done:
4236         close_file(fsp, NORMAL_CLOSE);
4237         return status;
4238 }
4239
4240 static BOOL can_access_file_acl(struct connection_struct *conn,
4241                                 const char * fname, SMB_STRUCT_STAT *psbuf,
4242                                 uint32_t access_mask)
4243 {
4244         BOOL result;
4245         NTSTATUS status;
4246         uint32_t access_granted;
4247         struct security_descriptor_info *secdesc = NULL;
4248
4249         status = conn_get_nt_acl(tmp_talloc_ctx(), conn, fname, psbuf, &secdesc);
4250         if (!NT_STATUS_IS_OK(status)) {
4251                 DEBUG(5, ("Could not get acl: %s\n", nt_errstr(status)));
4252                 return False;
4253         }
4254
4255         result = se_access_check(secdesc, current_user.nt_user_token,
4256                                  access_mask, &access_granted, &status);
4257         TALLOC_FREE(secdesc);
4258         return result;
4259 }
4260
4261 /****************************************************************************
4262  Actually emulate the in-kernel access checking for delete access. We need
4263  this to successfully return ACCESS_DENIED on a file open for delete access.
4264 ****************************************************************************/
4265
4266 BOOL can_delete_file_in_directory(connection_struct *conn, const char *fname)
4267 {
4268         SMB_STRUCT_STAT sbuf;
4269         pstring dname;
4270
4271         if (!CAN_WRITE(conn)) {
4272                 return False;
4273         }
4274
4275         /* Get the parent directory permission mask and owners. */
4276         pstrcpy(dname, parent_dirname(fname));
4277         if(SMB_VFS_STAT(conn, dname, &sbuf) != 0) {
4278                 return False;
4279         }
4280
4281         /* fast paths first */
4282
4283         if (!S_ISDIR(sbuf.st_mode)) {
4284                 return False;
4285         }
4286         if (current_user.ut.uid == 0 || conn->admin_user) {
4287                 /* I'm sorry sir, I didn't know you were root... */
4288                 return True;
4289         }
4290
4291         /* Check primary owner write access. */
4292         if (current_user.ut.uid == sbuf.st_uid) {
4293                 return (sbuf.st_mode & S_IWUSR) ? True : False;
4294         }
4295
4296 #ifdef S_ISVTX
4297         /* sticky bit means delete only by owner or root. */
4298         if (sbuf.st_mode & S_ISVTX) {
4299                 SMB_STRUCT_STAT sbuf_file;
4300                 if(SMB_VFS_STAT(conn, fname, &sbuf_file) != 0) {
4301                         if (errno == ENOENT) {
4302                                 /* If the file doesn't already exist then
4303                                  * yes we'll be able to delete it. */
4304                                 return True;
4305                         }
4306                         return False;
4307                 }
4308                 /*
4309                  * Patch from SATOH Fumiyasu <fumiyas@miraclelinux.com>
4310                  * for bug #3348. Don't assume owning sticky bit
4311                  * directory means write access allowed.
4312                  */
4313                 if (current_user.ut.uid != sbuf_file.st_uid) {
4314                         return False;
4315                 }
4316         }
4317 #endif
4318
4319         /* now for ACL checks */
4320
4321         return can_access_file_acl(conn, dname, &sbuf, FILE_WRITE_DATA);
4322 }
4323
4324 /****************************************************************************
4325  Actually emulate the in-kernel access checking for read/write access. We need
4326  this to successfully check for ability to write for dos filetimes.
4327  Note this doesn't take into account share write permissions.
4328 ****************************************************************************/
4329
4330 BOOL can_access_file(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf, uint32 access_mask)
4331 {
4332         if (!(access_mask & (FILE_READ_DATA|FILE_WRITE_DATA))) {
4333                 return False;
4334         }
4335         access_mask &= (FILE_READ_DATA|FILE_WRITE_DATA);
4336
4337         /* some fast paths first */
4338
4339         DEBUG(10,("can_access_file: requesting 0x%x on file %s\n",
4340                 (unsigned int)access_mask, fname ));
4341
4342         if (current_user.ut.uid == 0 || conn->admin_user) {
4343                 /* I'm sorry sir, I didn't know you were root... */
4344                 return True;
4345         }
4346
4347         if (!VALID_STAT(*psbuf)) {
4348                 /* Get the file permission mask and owners. */
4349                 if(SMB_VFS_STAT(conn, fname, psbuf) != 0) {
4350                         return False;
4351                 }
4352         }
4353
4354         /* Check primary owner access. */
4355         if (current_user.ut.uid == psbuf->st_uid) {
4356                 switch (access_mask) {
4357                         case FILE_READ_DATA:
4358                                 return (psbuf->st_mode & S_IRUSR) ? True : False;
4359
4360                         case FILE_WRITE_DATA:
4361                                 return (psbuf->st_mode & S_IWUSR) ? True : False;
4362
4363                         default: /* FILE_READ_DATA|FILE_WRITE_DATA */
4364
4365                                 if ((psbuf->st_mode & (S_IWUSR|S_IRUSR)) == (S_IWUSR|S_IRUSR)) {
4366                                         return True;
4367                                 } else {
4368                                         return False;
4369                                 }
4370                 }
4371         }
4372
4373         /* now for ACL checks */
4374
4375         return can_access_file_acl(conn, fname, psbuf, access_mask);
4376 }
4377
4378 /****************************************************************************
4379  Userspace check for write access.
4380  Note this doesn't take into account share write permissions.
4381 ****************************************************************************/
4382
4383 BOOL can_write_to_file(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf)
4384 {
4385         return can_access_file(conn, fname, psbuf, FILE_WRITE_DATA);
4386 }
4387
4388 /********************************************************************
4389  Pull the NT ACL from a file on disk or the OpenEventlog() access
4390  check.  Caller is responsible for freeing the returned security
4391  descriptor via TALLOC_FREE().  This is designed for dealing with
4392  user space access checks in smbd outside of the VFS.  For example,
4393  checking access rights in OpenEventlog().
4394
4395  Assume we are dealing with files (for now)
4396 ********************************************************************/
4397
4398 SEC_DESC* get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4399 {
4400         SEC_DESC *psd, *ret_sd;
4401         connection_struct conn;
4402         files_struct finfo;
4403         struct fd_handle fh;
4404         pstring path;
4405         pstring filename;
4406
4407         ZERO_STRUCT( conn );
4408
4409         if ( !(conn.mem_ctx = talloc_init( "novfs_get_nt_acl" )) ) {
4410                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4411                 return NULL;
4412         }
4413
4414         if (!(conn.params = TALLOC_P(conn.mem_ctx, struct share_params))) {
4415                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4416                 TALLOC_FREE(conn.mem_ctx);
4417                 return NULL;
4418         }
4419
4420         conn.params->service = -1;
4421
4422         pstrcpy( path, "/" );
4423         set_conn_connectpath(&conn, path);
4424
4425         if (!smbd_vfs_init(&conn)) {
4426                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4427                 conn_free_internal( &conn );
4428                 return NULL;
4429         }
4430
4431         ZERO_STRUCT( finfo );
4432         ZERO_STRUCT( fh );
4433
4434         finfo.fnum = -1;
4435         finfo.conn = &conn;
4436         finfo.fh = &fh;
4437         finfo.fh->fd = -1;
4438         pstrcpy( filename, fname );
4439         finfo.fsp_name = filename;
4440
4441         if (get_nt_acl( &finfo, DACL_SECURITY_INFORMATION, &psd ) == 0) {
4442                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4443                 conn_free_internal( &conn );
4444                 return NULL;
4445         }
4446
4447         ret_sd = dup_sec_desc( ctx, psd );
4448
4449         conn_free_internal( &conn );
4450
4451         return ret_sd;
4452 }