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   1 /*
   2  * ntfs-capture.c
   3  *
   4  * Capture a WIM image from a NTFS volume.  We capture everything we can,
   5  * including security data and alternate data streams.
   6  */
   7
   8 /*
   9  * Copyright (C) 2012, 2013 Eric Biggers
  10  *
  11  * This file is part of wimlib, a library for working with WIM files.
  12  *
  13  * wimlib is free software; you can redistribute it and/or modify it under the
  14  * terms of the GNU General Public License as published by the Free
  15  * Software Foundation; either version 3 of the License, or (at your option)
  16  * any later version.
  17  *
  18  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  19  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  20  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  21  * details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  25  */
  26
  27
  28 #include "config.h"
  29
  30 #include <ntfs-3g/endians.h>
  31 #include <ntfs-3g/types.h>
  32
  33 #include "buffer_io.h"
  34 #include "dentry.h"
  35 #include "lookup_table.h"
  36 #include "security.h"
  37 #include "wimlib_internal.h"
  38
  39 #include <ntfs-3g/layout.h>
  40 #include <ntfs-3g/acls.h>
  41 #include <ntfs-3g/attrib.h>
  42 #include <ntfs-3g/misc.h>
  43 #include <ntfs-3g/reparse.h>
  44 #include <ntfs-3g/security.h> /* ntfs-3g/security.h before ntfs-3g/xattrs.h */
  45 #include <ntfs-3g/xattrs.h>
  46 #include <ntfs-3g/volume.h>
  47 #include <stdlib.h>
  48 #include <unistd.h>
  49 #include <errno.h>
  50
  51 #ifdef HAVE_ALLOCA_H
  52 #include <alloca.h>
  53 #endif
  54
  55 static inline ntfschar *
  56 attr_record_name(ATTR_RECORD *ar)
  57 {
  58         return (ntfschar*)((u8*)ar + le16_to_cpu(ar->name_offset));
  59 }
  60
  61 /* Calculates the SHA1 message digest of a NTFS attribute.
  62  *
  63  * @ni:  The NTFS inode containing the attribute.
  64  * @ar:  The ATTR_RECORD describing the attribute.
  65  * @md:  If successful, the returned SHA1 message digest.
  66  * @reparse_tag_ret:    Optional pointer into which the first 4 bytes of the
  67  *                              attribute will be written (to get the reparse
  68  *                              point ID)
  69  *
  70  * Return 0 on success or nonzero on error.
  71  */
  72 static int
  73 ntfs_attr_sha1sum(ntfs_inode *ni, ATTR_RECORD *ar,
  74                   u8 md[SHA1_HASH_SIZE],
  75                   bool is_reparse_point,
  76                   u32 *reparse_tag_ret)
  77 {
  78         s64 pos = 0;
  79         s64 bytes_remaining;
  80         char buf[BUFFER_SIZE];
  81         ntfs_attr *na;
  82         SHA_CTX ctx;
  83
  84         na = ntfs_attr_open(ni, ar->type, attr_record_name(ar),
  85                             ar->name_length);
  86         if (!na) {
  87                 ERROR_WITH_ERRNO("Failed to open NTFS attribute");
  88                 return WIMLIB_ERR_NTFS_3G;
  89         }
  90
  91         bytes_remaining = na->data_size;
  92
  93         if (is_reparse_point) {
  94                 if (ntfs_attr_pread(na, 0, 8, buf) != 8)
  95                         goto out_error;
  96                 *reparse_tag_ret = le32_to_cpu(*(u32*)buf);
  97                 DEBUG("ReparseTag = %#x", *reparse_tag_ret);
  98                 pos = 8;
  99                 bytes_remaining -= 8;
 100         }
 101
 102         sha1_init(&ctx);
 103         while (bytes_remaining) {
 104                 s64 to_read = min(bytes_remaining, sizeof(buf));
 105                 if (ntfs_attr_pread(na, pos, to_read, buf) != to_read)
 106                         goto out_error;
 107                 sha1_update(&ctx, buf, to_read);
 108                 pos += to_read;
 109                 bytes_remaining -= to_read;
 110         }
 111         sha1_final(md, &ctx);
 112         ntfs_attr_close(na);
 113         return 0;
 114 out_error:
 115         ERROR_WITH_ERRNO("Error reading NTFS attribute");
 116         return WIMLIB_ERR_NTFS_3G;
 117 }
 118
 119 /* Load the streams from a file or reparse point in the NTFS volume into the WIM
 120  * lookup table */
 121 static int
 122 capture_ntfs_streams(struct wim_dentry *dentry,
 123                      ntfs_inode *ni,
 124                      mbchar *path,
 125                      size_t path_len,
 126                      struct wim_lookup_table *lookup_table,
 127                      ntfs_volume **ntfs_vol_p,
 128                      ATTR_TYPES type)
 129 {
 130         ntfs_attr_search_ctx *actx;
 131         u8 attr_hash[SHA1_HASH_SIZE];
 132         struct ntfs_location *ntfs_loc = NULL;
 133         int ret = 0;
 134         struct wim_lookup_table_entry *lte;
 135
 136         DEBUG2("Capturing NTFS data streams from `%s'", path);
 137
 138         /* Get context to search the streams of the NTFS file. */
 139         actx = ntfs_attr_get_search_ctx(ni, NULL);
 140         if (!actx) {
 141                 ERROR_WITH_ERRNO("Cannot get NTFS attribute search "
 142                                  "context");
 143                 return WIMLIB_ERR_NTFS_3G;
 144         }
 145
 146         /* Capture each data stream or reparse data stream. */
 147         while (!ntfs_attr_lookup(type, NULL, 0,
 148                                  CASE_SENSITIVE, 0, NULL, 0, actx))
 149         {
 150                 u32 reparse_tag;
 151                 u64 data_size = ntfs_get_attribute_value_length(actx->attr);
 152                 u64 name_length = actx->attr->name_length;
 153                 if (data_size == 0) {
 154                         if (errno != 0) {
 155                                 ERROR_WITH_ERRNO("Failed to get size of attribute of "
 156                                                  "`%s'", path);
 157                                 ret = WIMLIB_ERR_NTFS_3G;
 158                                 goto out_put_actx;
 159                         }
 160                         /* Empty stream.  No lookup table entry is needed. */
 161                         lte = NULL;
 162                 } else {
 163                         if (type == AT_REPARSE_POINT && data_size < 8) {
 164                                 ERROR("`%s': reparse point buffer too small",
 165                                       path);
 166                                 ret = WIMLIB_ERR_NTFS_3G;
 167                                 goto out_put_actx;
 168                         }
 169                         /* Checksum the stream. */
 170                         ret = ntfs_attr_sha1sum(ni, actx->attr, attr_hash,
 171                                                 type == AT_REPARSE_POINT, &reparse_tag);
 172                         if (ret != 0)
 173                                 goto out_put_actx;
 174
 175                         if (type == AT_REPARSE_POINT)
 176                                 dentry->d_inode->i_reparse_tag = reparse_tag;
 177
 178                         /* Make a lookup table entry for the stream, or use an existing
 179                          * one if there's already an identical stream. */
 180                         lte = __lookup_resource(lookup_table, attr_hash);
 181                         ret = WIMLIB_ERR_NOMEM;
 182                         if (lte) {
 183                                 lte->refcnt++;
 184                         } else {
 185                                 ntfs_loc = CALLOC(1, sizeof(*ntfs_loc));
 186                                 if (!ntfs_loc)
 187                                         goto out_put_actx;
 188                                 ntfs_loc->ntfs_vol_p = ntfs_vol_p;
 189                                 ntfs_loc->path = MALLOC(path_len + 1);
 190                                 if (!ntfs_loc->path)
 191                                         goto out_free_ntfs_loc;
 192                                 memcpy(ntfs_loc->path, path, path_len + 1);
 193                                 if (name_length) {
 194                                         ntfs_loc->stream_name = MALLOC(name_length * 2);
 195                                         if (!ntfs_loc->stream_name)
 196                                                 goto out_free_ntfs_loc;
 197                                         memcpy(ntfs_loc->stream_name,
 198                                                attr_record_name(actx->attr),
 199                                                actx->attr->name_length * 2);
 200                                         ntfs_loc->stream_name_nchars = name_length;
 201                                 }
 202
 203                                 lte = new_lookup_table_entry();
 204                                 if (!lte)
 205                                         goto out_free_ntfs_loc;
 206                                 lte->ntfs_loc = ntfs_loc;
 207                                 lte->resource_location = RESOURCE_IN_NTFS_VOLUME;
 208                                 if (type == AT_REPARSE_POINT) {
 209                                         ntfs_loc->is_reparse_point = true;
 210                                         lte->resource_entry.original_size = data_size - 8;
 211                                         lte->resource_entry.size = data_size - 8;
 212                                 } else {
 213                                         ntfs_loc->is_reparse_point = false;
 214                                         lte->resource_entry.original_size = data_size;
 215                                         lte->resource_entry.size = data_size;
 216                                 }
 217                                 ntfs_loc = NULL;
 218                                 copy_hash(lte->hash, attr_hash);
 219                                 lookup_table_insert(lookup_table, lte);
 220                         }
 221                 }
 222                 if (name_length == 0) {
 223                         /* Unnamed data stream.  Put the reference to it in the
 224                          * dentry's inode. */
 225                         if (dentry->d_inode->i_lte) {
 226                                 WARNING("Found two un-named data streams for "
 227                                         "`%s'", path);
 228                                 free_lookup_table_entry(lte);
 229                         } else {
 230                                 dentry->d_inode->i_lte = lte;
 231                         }
 232                 } else {
 233                         /* Named data stream.  Put the reference to it in the
 234                          * alternate data stream entries */
 235                         struct wim_ads_entry *new_ads_entry;
 236
 237                         new_ads_entry = inode_add_ads_utf16le(dentry->d_inode,
 238                                                               attr_record_name(actx->attr),
 239                                                               name_length * 2);
 240                         if (!new_ads_entry)
 241                                 goto out_free_lte;
 242                         wimlib_assert(new_ads_entry->stream_name_nbytes == name_length * 2);
 243                         new_ads_entry->lte = lte;
 244                 }
 245         }
 246         ret = 0;
 247         goto out_put_actx;
 248 out_free_lte:
 249         free_lookup_table_entry(lte);
 250 out_free_ntfs_loc:
 251         if (ntfs_loc) {
 252                 FREE(ntfs_loc->path);
 253                 FREE(ntfs_loc->stream_name);
 254                 FREE(ntfs_loc);
 255         }
 256 out_put_actx:
 257         ntfs_attr_put_search_ctx(actx);
 258         if (ret == 0)
 259                 DEBUG2("Successfully captured NTFS streams from `%s'", path);
 260         else
 261                 ERROR("Failed to capture NTFS streams from `%s", path);
 262         return ret;
 263 }
 264
 265 /* Red-black tree that maps NTFS inode numbers to DOS names */
 266 struct dos_name_map {
 267         struct rb_root rb_root;
 268 };
 269
 270 struct dos_name_node {
 271         struct rb_node rb_node;
 272         char dos_name[24];
 273         int name_nbytes;
 274         u64 ntfs_ino;
 275 };
 276
 277 /* Inserts a new DOS name into the map */
 278 static int
 279 insert_dos_name(struct dos_name_map *map, const ntfschar *dos_name,
 280                 size_t name_nbytes, u64 ntfs_ino)
 281 {
 282         struct dos_name_node *new_node;
 283         struct rb_node **p;
 284         struct rb_root *root;
 285         struct rb_node *rb_parent;
 286
 287         DEBUG("DOS name_len = %zu", name_nbytes);
 288         new_node = MALLOC(sizeof(struct dos_name_node));
 289         if (!new_node)
 290                 return -1;
 291
 292         /* DOS names are supposed to be 12 characters max (that's 24 bytes,
 293          * assuming 2-byte ntfs characters) */
 294         wimlib_assert(name_nbytes <= sizeof(new_node->dos_name));
 295
 296         /* Initialize the DOS name, DOS name length, and NTFS inode number of
 297          * the red-black tree node */
 298         memcpy(new_node->dos_name, dos_name, name_nbytes);
 299         new_node->name_nbytes = name_nbytes;
 300         new_node->ntfs_ino = ntfs_ino;
 301
 302         /* Insert the red-black tree node */
 303         root = &map->rb_root;
 304         p = &root->rb_node;
 305         rb_parent = NULL;
 306         while (*p) {
 307                 struct dos_name_node *this;
 308
 309                 this = container_of(*p, struct dos_name_node, rb_node);
 310                 rb_parent = *p;
 311                 if (new_node->ntfs_ino < this->ntfs_ino)
 312                         p = &((*p)->rb_left);
 313                 else if (new_node->ntfs_ino > this->ntfs_ino)
 314                         p = &((*p)->rb_right);
 315                 else {
 316                         /* This should be impossible since a NTFS inode cannot
 317                          * have multiple DOS names, and we only should get each
 318                          * DOS name entry once from the ntfs_readdir() calls. */
 319                         ERROR("NTFS inode %"PRIu64" has multiple DOS names",
 320                               ntfs_ino);
 321                         return -1;
 322                 }
 323         }
 324         rb_link_node(&new_node->rb_node, rb_parent, p);
 325         rb_insert_color(&new_node->rb_node, root);
 326         DEBUG("Inserted DOS name for inode %"PRIu64, ntfs_ino);
 327         return 0;
 328 }
 329
 330 /* Returns a structure that contains the DOS name and its length for a NTFS
 331  * inode, or NULL if the inode has no DOS name. */
 332 static struct dos_name_node *
 333 lookup_dos_name(const struct dos_name_map *map, u64 ntfs_ino)
 334 {
 335         struct rb_node *node = map->rb_root.rb_node;
 336         while (node) {
 337                 struct dos_name_node *this;
 338                 this = container_of(node, struct dos_name_node, rb_node);
 339                 if (ntfs_ino < this->ntfs_ino)
 340                         node = node->rb_left;
 341                 else if (ntfs_ino > this->ntfs_ino)
 342                         node = node->rb_right;
 343                 else
 344                         return this;
 345         }
 346         return NULL;
 347 }
 348
 349 static int
 350 set_dentry_dos_name(struct wim_dentry *dentry, void *arg)
 351 {
 352         const struct dos_name_map *map = arg;
 353         const struct dos_name_node *node;
 354
 355         if (dentry->is_win32_name) {
 356                 node = lookup_dos_name(map, dentry->d_inode->i_ino);
 357                 if (node) {
 358                         dentry->short_name = MALLOC(node->name_nbytes + 2);
 359                         if (!dentry->short_name)
 360                                 return WIMLIB_ERR_NOMEM;
 361                         memcpy(dentry->short_name, node->dos_name,
 362                                node->name_nbytes);
 363                         dentry->short_name[node->name_nbytes / 2] = 0;
 364                         dentry->short_name_nbytes = node->name_nbytes;
 365                         DEBUG("Assigned DOS name to ino %"PRIu64,
 366                               dentry->d_inode->i_ino);
 367                 } else {
 368                         WARNING("NTFS inode %"PRIu64" has Win32 name with no "
 369                                 "corresponding DOS name",
 370                                 dentry->d_inode->i_ino);
 371                 }
 372         }
 373         return 0;
 374 }
 375
 376 static void
 377 free_dos_name_tree(struct rb_node *node) {
 378         if (node) {
 379                 free_dos_name_tree(node->rb_left);
 380                 free_dos_name_tree(node->rb_right);
 381                 FREE(container_of(node, struct dos_name_node, rb_node));
 382         }
 383 }
 384
 385 static void
 386 destroy_dos_name_map(struct dos_name_map *map)
 387 {
 388         free_dos_name_tree(map->rb_root.rb_node);
 389 }
 390
 391 struct readdir_ctx {
 392         struct wim_dentry *parent;
 393         ntfs_inode *dir_ni;
 394         mbchar *path;
 395         size_t path_len;
 396         struct wim_lookup_table *lookup_table;
 397         struct sd_set *sd_set;
 398         struct dos_name_map *dos_name_map;
 399         const struct capture_config *config;
 400         ntfs_volume **ntfs_vol_p;
 401         int add_image_flags;
 402         wimlib_progress_func_t progress_func;
 403 };
 404
 405 static int
 406 build_dentry_tree_ntfs_recursive(struct wim_dentry **root_p, ntfs_inode *dir_ni,
 407                                  ntfs_inode *ni, char path[], size_t path_len,
 408                                  int name_type,
 409                                  struct wim_lookup_table *lookup_table,
 410                                  struct sd_set *sd_set,
 411                                  const struct capture_config *config,
 412                                  ntfs_volume **ntfs_vol_p,
 413                                  int add_image_flags,
 414                                  wimlib_progress_func_t progress_func);
 415
 416 static int
 417 wim_ntfs_capture_filldir(void *dirent, const ntfschar *name,
 418                          const int name_nchars, const int name_type,
 419                          const s64 pos, const MFT_REF mref,
 420                          const unsigned dt_type)
 421 {
 422         struct readdir_ctx *ctx;
 423         size_t mbs_name_nbytes;
 424         char *mbs_name;
 425         struct wim_dentry *child;
 426         int ret;
 427         size_t path_len;
 428         size_t name_nbytes = name_nchars * sizeof(ntfschar);
 429
 430         ctx = dirent;
 431         if (name_type & FILE_NAME_DOS) {
 432                 /* If this is the entry for a DOS name, store it for later. */
 433                 ret = insert_dos_name(ctx->dos_name_map, name,
 434                                       name_nbytes, mref & MFT_REF_MASK_CPU);
 435
 436                 /* Return now if an error occurred or if this is just a DOS name
 437                  * and not a Win32+DOS name. */
 438                 if (ret != 0 || name_type == FILE_NAME_DOS)
 439                         return ret;
 440         }
 441         ret = utf16le_to_mbs(name, name_nbytes,
 442                              &mbs_name, &mbs_name_nbytes);
 443         if (ret != 0)
 444                 return -1;
 445
 446         if (mbs_name[0] == '.' &&
 447              (mbs_name[1] == '\0' ||
 448               (mbs_name[1] == '.' && mbs_name[2] == '\0'))) {
 449                 /* . or .. entries
 450                  *
 451                  * note: name_type is POSIX for these, so DOS names will not
 452                  * have been inserted for them.  */
 453                 ret = 0;
 454                 goto out_free_mbs_name;
 455         }
 456
 457         /* Open the inode for this directory entry and recursively capture the
 458          * directory tree rooted at it */
 459         ntfs_inode *ni = ntfs_inode_open(ctx->dir_ni->vol, mref);
 460         if (!ni) {
 461                 ERROR_WITH_ERRNO("Failed to open NTFS inode");
 462                 goto out_free_mbs_name;
 463         }
 464         path_len = ctx->path_len;
 465         if (path_len != 1)
 466                 ctx->path[path_len++] = '/';
 467         memcpy(ctx->path + path_len, mbs_name, mbs_name_nbytes + 1);
 468         path_len += mbs_name_nbytes;
 469         child = NULL;
 470         ret = build_dentry_tree_ntfs_recursive(&child, ctx->dir_ni,
 471                                                ni, ctx->path, path_len, name_type,
 472                                                ctx->lookup_table, ctx->sd_set,
 473                                                ctx->config, ctx->ntfs_vol_p,
 474                                                ctx->add_image_flags,
 475                                                ctx->progress_func);
 476         if (child)
 477                 dentry_add_child(ctx->parent, child);
 478         ntfs_inode_close(ni);
 479 out_free_mbs_name:
 480         FREE(mbs_name);
 481         return ret;
 482 }
 483
 484 /* Recursively build a WIM dentry tree corresponding to a NTFS volume.
 485  * At the same time, update the WIM lookup table with lookup table entries for
 486  * the NTFS streams, and build an array of security descriptors.
 487  */
 488 static int
 489 build_dentry_tree_ntfs_recursive(struct wim_dentry **root_p,
 490                                  ntfs_inode *dir_ni,
 491                                  ntfs_inode *ni,
 492                                  mbchar *path,
 493                                  size_t path_len,
 494                                  int name_type,
 495                                  struct wim_lookup_table *lookup_table,
 496                                  struct sd_set *sd_set,
 497                                  const struct capture_config *config,
 498                                  ntfs_volume **ntfs_vol_p,
 499                                  int add_image_flags,
 500                                  wimlib_progress_func_t progress_func)
 501 {
 502         u32 attributes;
 503         int ret;
 504         struct wim_dentry *root;
 505
 506         if (exclude_path(path, config, false)) {
 507                 /* Exclude a file or directory tree based on the capture
 508                  * configuration file */
 509                 if ((add_image_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 510                     && progress_func)
 511                 {
 512                         union wimlib_progress_info info;
 513                         info.scan.cur_path = path;
 514                         info.scan.excluded = true;
 515                         progress_func(WIMLIB_PROGRESS_MSG_SCAN_DENTRY, &info);
 516                 }
 517                 *root_p = NULL;
 518                 return 0;
 519         }
 520
 521         /* Get file attributes */
 522         struct SECURITY_CONTEXT ctx;
 523         memset(&ctx, 0, sizeof(ctx));
 524         ctx.vol = ni->vol;
 525         ret = ntfs_xattr_system_getxattr(&ctx, XATTR_NTFS_ATTRIB,
 526                                          ni, dir_ni, (char *)&attributes,
 527                                          sizeof(u32));
 528         if (ret != 4) {
 529                 ERROR_WITH_ERRNO("Failed to get NTFS attributes from `%s'",
 530                                  path);
 531                 return WIMLIB_ERR_NTFS_3G;
 532         }
 533
 534         if ((add_image_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 535             && progress_func)
 536         {
 537                 union wimlib_progress_info info;
 538                 info.scan.cur_path = path;
 539                 info.scan.excluded = false;
 540                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_DENTRY, &info);
 541         }
 542
 543         /* Create the new WIM dentry */
 544         ret = new_dentry_with_timeless_inode(path_basename(path), &root);
 545         if (ret)
 546                 return ret;
 547
 548         *root_p = root;
 549
 550         if (name_type & FILE_NAME_WIN32) /* Win32 or Win32+DOS name */
 551                 root->is_win32_name = 1;
 552         root->d_inode->i_creation_time    = le64_to_cpu(ni->creation_time);
 553         root->d_inode->i_last_write_time  = le64_to_cpu(ni->last_data_change_time);
 554         root->d_inode->i_last_access_time = le64_to_cpu(ni->last_access_time);
 555         root->d_inode->i_attributes       = le32_to_cpu(attributes);
 556         root->d_inode->i_ino              = ni->mft_no;
 557         root->d_inode->i_resolved         = 1;
 558
 559         if (attributes & FILE_ATTR_REPARSE_POINT) {
 560                 /* Junction point, symbolic link, or other reparse point */
 561                 ret = capture_ntfs_streams(root, ni, path, path_len,
 562                                            lookup_table, ntfs_vol_p,
 563                                            AT_REPARSE_POINT);
 564         } else if (ni->mrec->flags & MFT_RECORD_IS_DIRECTORY) {
 565
 566                 /* Normal directory */
 567                 s64 pos = 0;
 568                 struct dos_name_map dos_name_map = { .rb_root = {.rb_node = NULL} };
 569                 struct readdir_ctx ctx = {
 570                         .parent          = root,
 571                         .dir_ni          = ni,
 572                         .path            = path,
 573                         .path_len        = path_len,
 574                         .lookup_table    = lookup_table,
 575                         .sd_set          = sd_set,
 576                         .dos_name_map    = &dos_name_map,
 577                         .config          = config,
 578                         .ntfs_vol_p      = ntfs_vol_p,
 579                         .add_image_flags = add_image_flags,
 580                         .progress_func   = progress_func,
 581                 };
 582                 ret = ntfs_readdir(ni, &pos, &ctx, wim_ntfs_capture_filldir);
 583                 if (ret) {
 584                         ERROR_WITH_ERRNO("ntfs_readdir()");
 585                         ret = WIMLIB_ERR_NTFS_3G;
 586                 } else {
 587                         ret = for_dentry_child(root, set_dentry_dos_name,
 588                                                &dos_name_map);
 589                 }
 590                 destroy_dos_name_map(&dos_name_map);
 591         } else {
 592                 /* Normal file */
 593                 ret = capture_ntfs_streams(root, ni, path, path_len,
 594                                            lookup_table, ntfs_vol_p,
 595                                            AT_DATA);
 596         }
 597         if (ret != 0)
 598                 return ret;
 599
 600         /* Get security descriptor */
 601         char _sd[1];
 602         char *sd = _sd;
 603         errno = 0;
 604         ret = ntfs_xattr_system_getxattr(&ctx, XATTR_NTFS_ACL,
 605                                          ni, dir_ni, sd,
 606                                          sizeof(sd));
 607         if (ret > sizeof(sd)) {
 608                 sd = alloca(ret);
 609                 ret = ntfs_xattr_system_getxattr(&ctx, XATTR_NTFS_ACL,
 610                                                  ni, dir_ni, sd, ret);
 611         }
 612         if (ret > 0) {
 613                 root->d_inode->i_security_id = sd_set_add_sd(sd_set, sd, ret);
 614                 if (root->d_inode->i_security_id == -1) {
 615                         ERROR("Out of memory");
 616                         return WIMLIB_ERR_NOMEM;
 617                 }
 618                 DEBUG("Added security ID = %u for `%s'",
 619                       root->d_inode->i_security_id, path);
 620                 ret = 0;
 621         } else if (ret < 0) {
 622                 ERROR_WITH_ERRNO("Failed to get security information from "
 623                                  "`%s'", path);
 624                 ret = WIMLIB_ERR_NTFS_3G;
 625         } else {
 626                 root->d_inode->i_security_id = -1;
 627                 DEBUG("No security ID for `%s'", path);
 628         }
 629         return ret;
 630 }
 631
 632 int
 633 build_dentry_tree_ntfs(struct wim_dentry **root_p,
 634                        const mbchar *device,
 635                        struct wim_lookup_table *lookup_table,
 636                        struct wim_security_data *sd,
 637                        const struct capture_config *config,
 638                        int add_image_flags,
 639                        wimlib_progress_func_t progress_func,
 640                        void *extra_arg)
 641 {
 642         ntfs_volume *vol;
 643         ntfs_inode *root_ni;
 644         int ret;
 645         struct sd_set sd_set = {
 646                 .sd = sd,
 647                 .rb_root = {NULL},
 648         };
 649         ntfs_volume **ntfs_vol_p = extra_arg;
 650
 651         DEBUG("Mounting NTFS volume `%s' read-only", device);
 652
 653 #ifdef HAVE_NTFS_MNT_RDONLY
 654         /* NTFS-3g 2013 */
 655         vol = ntfs_mount(device, NTFS_MNT_RDONLY);
 656 #else
 657         /* NTFS-3g 2011, 2012 */
 658         vol = ntfs_mount(device, MS_RDONLY);
 659 #endif
 660         if (!vol) {
 661                 ERROR_WITH_ERRNO("Failed to mount NTFS volume `%s' read-only",
 662                                  device);
 663                 return WIMLIB_ERR_NTFS_3G;
 664         }
 665         ntfs_open_secure(vol);
 666
 667         /* We don't want to capture the special NTFS files such as $Bitmap.  Not
 668          * to be confused with "hidden" or "system" files which are real files
 669          * that we do need to capture.  */
 670         NVolClearShowSysFiles(vol);
 671
 672         DEBUG("Opening root NTFS dentry");
 673         root_ni = ntfs_inode_open(vol, FILE_root);
 674         if (!root_ni) {
 675                 ERROR_WITH_ERRNO("Failed to open root inode of NTFS volume "
 676                                  "`%s'", device);
 677                 ret = WIMLIB_ERR_NTFS_3G;
 678                 goto out;
 679         }
 680
 681         /* Currently we assume that all the paths fit into this length and there
 682          * is no check for overflow. */
 683         mbchar *path = MALLOC(32768);
 684         if (!path) {
 685                 ERROR("Could not allocate memory for NTFS pathname");
 686                 ret = WIMLIB_ERR_NOMEM;
 687                 goto out_cleanup;
 688         }
 689
 690         path[0] = '/';
 691         path[1] = '\0';
 692         ret = build_dentry_tree_ntfs_recursive(root_p, NULL, root_ni, path, 1,
 693                                                FILE_NAME_POSIX, lookup_table,
 694                                                &sd_set,
 695                                                config, ntfs_vol_p,
 696                                                add_image_flags,
 697                                                progress_func);
 698 out_cleanup:
 699         FREE(path);
 700         ntfs_inode_close(root_ni);
 701         destroy_sd_set(&sd_set);
 702 out:
 703         ntfs_index_ctx_put(vol->secure_xsii);
 704         ntfs_index_ctx_put(vol->secure_xsdh);
 705         ntfs_inode_close(vol->secure_ni);
 706
 707         if (ret) {
 708                 if (ntfs_umount(vol, FALSE) != 0) {
 709                         ERROR_WITH_ERRNO("Failed to unmount NTFS volume `%s'",
 710                                          device);
 711                         if (ret == 0)
 712                                 ret = WIMLIB_ERR_NTFS_3G;
 713                 }
 714         } else {
 715                 /* We need to leave the NTFS volume mounted so that we can read
 716                  * the NTFS files again when we are actually writing the WIM */
 717                 *ntfs_vol_p = vol;
 718         }
 719         return ret;
 720 }