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