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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 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 #ifdef WITH_NTFS_3G
  31 #include <ntfs-3g/endians.h>
  32 #include <ntfs-3g/types.h>
  33 #endif
  34
  35 #include "wimlib_internal.h"
  36
  37
  38 #ifdef WITH_NTFS_3G
  39 #include "dentry.h"
  40 #include "lookup_table.h"
  41 #include "io.h"
  42 #include <ntfs-3g/layout.h>
  43 #include <ntfs-3g/acls.h>
  44 #include <ntfs-3g/attrib.h>
  45 #include <ntfs-3g/misc.h>
  46 #include <ntfs-3g/reparse.h>
  47 #include <ntfs-3g/security.h> /* security.h before xattrs.h */
  48 #include <ntfs-3g/xattrs.h>
  49 #include <ntfs-3g/volume.h>
  50 #include <stdlib.h>
  51 #include <unistd.h>
  52 #include <errno.h>
  53
  54 #if 0
  55 extern int ntfs_get_inode_security(ntfs_inode *ni, u32 selection, char *buf,
  56                                    u32 buflen, u32 *psize);
  57
  58 extern u32 ntfs_get_inode_attributes(ntfs_inode *ni);
  59 #endif
  60
  61 /* Structure that allows searching the security descriptors by SHA1 message
  62  * digest. */
  63 struct sd_set {
  64         struct wim_security_data *sd;
  65         struct sd_node *root;
  66 };
  67
  68 /* Binary tree node of security descriptors, indexed by the @hash field. */
  69 struct sd_node {
  70         int security_id;
  71         u8 hash[SHA1_HASH_SIZE];
  72         struct sd_node *left;
  73         struct sd_node *right;
  74 };
  75
  76 static void free_sd_tree(struct sd_node *root)
  77 {
  78         if (root) {
  79                 free_sd_tree(root->left);
  80                 free_sd_tree(root->right);
  81                 FREE(root);
  82         }
  83 }
  84 /* Frees a security descriptor index set. */
  85 static void destroy_sd_set(struct sd_set *sd_set)
  86 {
  87         free_sd_tree(sd_set->root);
  88 }
  89
  90 /* Inserts a a new node into the security descriptor index tree. */
  91 static void insert_sd_node(struct sd_node *new, struct sd_node *root)
  92 {
  93         int cmp = hashes_cmp(new->hash, root->hash);
  94         if (cmp < 0) {
  95                 if (root->left)
  96                         insert_sd_node(new, root->left);
  97                 else
  98                         root->left = new;
  99         } else if (cmp > 0) {
 100                 if (root->right)
 101                         insert_sd_node(new, root->right);
 102                 else
 103                         root->right = new;
 104         } else {
 105                 wimlib_assert(0);
 106         }
 107 }
 108
 109 /* Returns the security ID of the security data having a SHA1 message digest of
 110  * @hash in the security descriptor index tree rooted at @root.
 111  *
 112  * If not found, return -1. */
 113 static int lookup_sd(const u8 hash[SHA1_HASH_SIZE], struct sd_node *root)
 114 {
 115         int cmp;
 116         if (!root)
 117                 return -1;
 118         cmp = hashes_cmp(hash, root->hash);
 119         if (cmp < 0)
 120                 return lookup_sd(hash, root->left);
 121         else if (cmp > 0)
 122                 return lookup_sd(hash, root->right);
 123         else
 124                 return root->security_id;
 125 }
 126
 127 /*
 128  * Adds a security descriptor to the indexed security descriptor set as well as
 129  * the corresponding `struct wim_security_data', and returns the new security
 130  * ID; or, if there is an existing security descriptor that is the same, return
 131  * the security ID for it.  If a new security descriptor cannot be allocated,
 132  * return -1.
 133  */
 134 static int sd_set_add_sd(struct sd_set *sd_set, const char descriptor[],
 135                          size_t size)
 136 {
 137         u8 hash[SHA1_HASH_SIZE];
 138         int security_id;
 139         struct sd_node *new;
 140         u8 **descriptors;
 141         u64 *sizes;
 142         u8 *descr_copy;
 143         struct wim_security_data *sd;
 144
 145         sha1_buffer((const u8*)descriptor, size, hash);
 146
 147         security_id = lookup_sd(hash, sd_set->root);
 148         if (security_id >= 0)
 149                 return security_id;
 150
 151         new = MALLOC(sizeof(*new));
 152         if (!new)
 153                 goto out;
 154         descr_copy = MALLOC(size);
 155         if (!descr_copy)
 156                 goto out_free_node;
 157
 158         sd = sd_set->sd;
 159
 160         memcpy(descr_copy, descriptor, size);
 161         new->security_id = sd->num_entries;
 162         new->left = NULL;
 163         new->right = NULL;
 164         copy_hash(new->hash, hash);
 165
 166
 167         descriptors = REALLOC(sd->descriptors,
 168                               (sd->num_entries + 1) * sizeof(sd->descriptors[0]));
 169         if (!descriptors)
 170                 goto out_free_descr;
 171         sd->descriptors = descriptors;
 172         sizes = REALLOC(sd->sizes,
 173                         (sd->num_entries + 1) * sizeof(sd->sizes[0]));
 174         if (!sizes)
 175                 goto out_free_descr;
 176         sd->sizes = sizes;
 177         sd->descriptors[sd->num_entries] = descr_copy;
 178         sd->sizes[sd->num_entries] = size;
 179         sd->num_entries++;
 180         DEBUG("There are now %d security descriptors", sd->num_entries);
 181         sd->total_length += size + sizeof(sd->sizes[0]);
 182
 183         if (sd_set->root)
 184                 insert_sd_node(new, sd_set->root);
 185         else
 186                 sd_set->root = new;
 187         return new->security_id;
 188 out_free_descr:
 189         FREE(descr_copy);
 190 out_free_node:
 191         FREE(new);
 192 out:
 193         return -1;
 194 }
 195
 196 static inline ntfschar *attr_record_name(ATTR_RECORD *ar)
 197 {
 198         return (ntfschar*)((u8*)ar + le16_to_cpu(ar->name_offset));
 199 }
 200
 201 /* Calculates the SHA1 message digest of a NTFS attribute.
 202  *
 203  * @ni:  The NTFS inode containing the attribute.
 204  * @ar:  The ATTR_RECORD describing the attribute.
 205  * @md:  If successful, the returned SHA1 message digest.
 206  * @reparse_tag_ret:    Optional pointer into which the first 4 bytes of the
 207  *                              attribute will be written (to get the reparse
 208  *                              point ID)
 209  *
 210  * Return 0 on success or nonzero on error.
 211  */
 212 static int ntfs_attr_sha1sum(ntfs_inode *ni, ATTR_RECORD *ar,
 213                              u8 md[SHA1_HASH_SIZE],
 214                              u32 *reparse_tag_ret)
 215 {
 216         s64 pos = 0;
 217         s64 bytes_remaining;
 218         char buf[4096];
 219         ntfs_attr *na;
 220         SHA_CTX ctx;
 221
 222         na = ntfs_attr_open(ni, ar->type, attr_record_name(ar),
 223                             ar->name_length);
 224         if (!na) {
 225                 ERROR_WITH_ERRNO("Failed to open NTFS attribute");
 226                 return WIMLIB_ERR_NTFS_3G;
 227         }
 228
 229         bytes_remaining = na->data_size;
 230         sha1_init(&ctx);
 231
 232         DEBUG2("Calculating SHA1 message digest (%"PRIu64" bytes)",
 233                bytes_remaining);
 234
 235         while (bytes_remaining) {
 236                 s64 to_read = min(bytes_remaining, sizeof(buf));
 237                 if (ntfs_attr_pread(na, pos, to_read, buf) != to_read) {
 238                         ERROR_WITH_ERRNO("Error reading NTFS attribute");
 239                         return WIMLIB_ERR_NTFS_3G;
 240                 }
 241                 if (bytes_remaining == na->data_size && reparse_tag_ret)
 242                         *reparse_tag_ret = le32_to_cpu(*(u32*)buf);
 243                 sha1_update(&ctx, buf, to_read);
 244                 pos += to_read;
 245                 bytes_remaining -= to_read;
 246         }
 247         sha1_final(md, &ctx);
 248         ntfs_attr_close(na);
 249         return 0;
 250 }
 251
 252 /* Load the streams from a WIM file or reparse point in the NTFS volume into the
 253  * WIM lookup table */
 254 static int capture_ntfs_streams(struct dentry *dentry, ntfs_inode *ni,
 255                                 char path[], size_t path_len,
 256                                 struct lookup_table *lookup_table,
 257                                 ntfs_volume **ntfs_vol_p,
 258                                 ATTR_TYPES type)
 259 {
 260
 261         ntfs_attr_search_ctx *actx;
 262         u8 attr_hash[SHA1_HASH_SIZE];
 263         struct ntfs_location *ntfs_loc = NULL;
 264         int ret = 0;
 265         struct lookup_table_entry *lte;
 266
 267         DEBUG2("Capturing NTFS data streams from `%s'", path);
 268
 269         /* Get context to search the streams of the NTFS file. */
 270         actx = ntfs_attr_get_search_ctx(ni, NULL);
 271         if (!actx) {
 272                 ERROR_WITH_ERRNO("Cannot get NTFS attribute search "
 273                                  "context");
 274                 return WIMLIB_ERR_NTFS_3G;
 275         }
 276
 277         /* Capture each data stream or reparse data stream. */
 278         while (!ntfs_attr_lookup(type, NULL, 0,
 279                                  CASE_SENSITIVE, 0, NULL, 0, actx))
 280         {
 281                 char *stream_name_utf8;
 282                 size_t stream_name_utf16_len;
 283                 u32 reparse_tag;
 284                 u64 data_size = ntfs_get_attribute_value_length(actx->attr);
 285                 u64 name_length = actx->attr->name_length;
 286
 287                 if (data_size == 0) {
 288                         if (errno != 0) {
 289                                 ERROR_WITH_ERRNO("Failed to get size of attribute of "
 290                                                  "`%s'", path);
 291                                 ret = WIMLIB_ERR_NTFS_3G;
 292                                 goto out_put_actx;
 293                         }
 294                         /* Empty stream.  No lookup table entry is needed. */
 295                         lte = NULL;
 296                 } else {
 297                         if (type == AT_REPARSE_POINT && data_size < 8) {
 298                                 ERROR("`%s': reparse point buffer too small",
 299                                       path);
 300                                 ret = WIMLIB_ERR_NTFS_3G;
 301                                 goto out_put_actx;
 302                         }
 303                         /* Checksum the stream. */
 304                         ret = ntfs_attr_sha1sum(ni, actx->attr, attr_hash, &reparse_tag);
 305                         if (ret != 0)
 306                                 goto out_put_actx;
 307
 308                         /* Make a lookup table entry for the stream, or use an existing
 309                          * one if there's already an identical stream. */
 310                         lte = __lookup_resource(lookup_table, attr_hash);
 311                         ret = WIMLIB_ERR_NOMEM;
 312                         if (lte) {
 313                                 lte->refcnt++;
 314                         } else {
 315                                 ntfs_loc = CALLOC(1, sizeof(*ntfs_loc));
 316                                 if (!ntfs_loc)
 317                                         goto out_put_actx;
 318                                 ntfs_loc->ntfs_vol_p = ntfs_vol_p;
 319                                 ntfs_loc->path_utf8 = MALLOC(path_len + 1);
 320                                 if (!ntfs_loc->path_utf8)
 321                                         goto out_free_ntfs_loc;
 322                                 memcpy(ntfs_loc->path_utf8, path, path_len + 1);
 323                                 if (name_length) {
 324                                         ntfs_loc->stream_name_utf16 = MALLOC(name_length * 2);
 325                                         if (!ntfs_loc->stream_name_utf16)
 326                                                 goto out_free_ntfs_loc;
 327                                         memcpy(ntfs_loc->stream_name_utf16,
 328                                                attr_record_name(actx->attr),
 329                                                actx->attr->name_length * 2);
 330                                         ntfs_loc->stream_name_utf16_num_chars = name_length;
 331                                 }
 332
 333                                 lte = new_lookup_table_entry();
 334                                 if (!lte)
 335                                         goto out_free_ntfs_loc;
 336                                 lte->ntfs_loc = ntfs_loc;
 337                                 lte->resource_location = RESOURCE_IN_NTFS_VOLUME;
 338                                 if (type == AT_REPARSE_POINT) {
 339                                         dentry->reparse_tag = reparse_tag;
 340                                         ntfs_loc->is_reparse_point = true;
 341                                         lte->resource_entry.original_size = data_size - 8;
 342                                         lte->resource_entry.size = data_size - 8;
 343                                 } else {
 344                                         ntfs_loc->is_reparse_point = false;
 345                                         lte->resource_entry.original_size = data_size;
 346                                         lte->resource_entry.size = data_size;
 347                                 }
 348                                 ntfs_loc = NULL;
 349                                 DEBUG("Add resource for `%s' (size = %zu)",
 350                                       dentry->file_name_utf8,
 351                                       lte->resource_entry.original_size);
 352                                 copy_hash(lte->hash, attr_hash);
 353                                 lookup_table_insert(lookup_table, lte);
 354                         }
 355                 }
 356                 if (name_length == 0) {
 357                         /* Unnamed data stream.  Put the reference to it in the
 358                          * dentry. */
 359                         if (dentry->lte) {
 360                                 ERROR("Found two un-named data streams for "
 361                                       "`%s'", path);
 362                                 ret = WIMLIB_ERR_NTFS_3G;
 363                                 goto out_free_lte;
 364                         }
 365                         dentry->lte = lte;
 366                 } else {
 367                         /* Named data stream.  Put the reference to it in the
 368                          * alternate data stream entries */
 369                         struct ads_entry *new_ads_entry;
 370                         size_t stream_name_utf8_len;
 371                         stream_name_utf8 = utf16_to_utf8((const char*)attr_record_name(actx->attr),
 372                                                          name_length * 2,
 373                                                          &stream_name_utf8_len);
 374                         if (!stream_name_utf8)
 375                                 goto out_free_lte;
 376                         new_ads_entry = dentry_add_ads(dentry, stream_name_utf8);
 377                         FREE(stream_name_utf8);
 378                         if (!new_ads_entry)
 379                                 goto out_free_lte;
 380
 381                         wimlib_assert(new_ads_entry->stream_name_len == name_length * 2);
 382
 383                         new_ads_entry->lte = lte;
 384                 }
 385         }
 386         ret = 0;
 387         goto out_put_actx;
 388 out_free_lte:
 389         free_lookup_table_entry(lte);
 390 out_free_ntfs_loc:
 391         if (ntfs_loc) {
 392                 FREE(ntfs_loc->path_utf8);
 393                 FREE(ntfs_loc->stream_name_utf16);
 394                 FREE(ntfs_loc);
 395         }
 396 out_put_actx:
 397         ntfs_attr_put_search_ctx(actx);
 398         if (ret == 0)
 399                 DEBUG2("Successfully captured NTFS streams from `%s'", path);
 400         else
 401                 ERROR("Failed to capture NTFS streams from `%s", path);
 402         return ret;
 403 }
 404
 405 struct readdir_ctx {
 406         struct dentry       *parent;
 407         ntfs_inode          *dir_ni;
 408         char                *path;
 409         size_t               path_len;
 410         struct lookup_table *lookup_table;
 411         struct sd_set       *sd_set;
 412         const struct capture_config *config;
 413         ntfs_volume        **ntfs_vol_p;
 414         int                  flags;
 415 };
 416
 417 static int
 418 build_dentry_tree_ntfs_recursive(struct dentry **root_p, ntfs_inode *dir_ni,
 419                                  ntfs_inode *ni, char path[], size_t path_len,
 420                                  int name_type,
 421                                  struct lookup_table *lookup_table,
 422                                  struct sd_set *sd_set,
 423                                  const struct capture_config *config,
 424                                  ntfs_volume **ntfs_vol_p,
 425                                  int flags);
 426
 427 static int wim_ntfs_capture_filldir(void *dirent, const ntfschar *name,
 428                                     const int name_len, const int name_type,
 429                                     const s64 pos, const MFT_REF mref,
 430                                     const unsigned dt_type)
 431 {
 432         struct readdir_ctx *ctx;
 433         size_t utf8_name_len;
 434         char *utf8_name;
 435         struct dentry *child = NULL;
 436         int ret;
 437         size_t path_len;
 438
 439         if (name_type == FILE_NAME_DOS)
 440                 return 0;
 441
 442         ret = -1;
 443
 444         utf8_name = utf16_to_utf8((const char*)name, name_len * 2,
 445                                   &utf8_name_len);
 446         if (!utf8_name)
 447                 goto out;
 448
 449         if (utf8_name[0] == '.' &&
 450              (utf8_name[1] == '\0' ||
 451               (utf8_name[1] == '.' && utf8_name[2] == '\0'))) {
 452                 ret = 0;
 453                 goto out_free_utf8_name;
 454         }
 455
 456         ctx = dirent;
 457
 458         ntfs_inode *ni = ntfs_inode_open(ctx->dir_ni->vol, mref);
 459         if (!ni) {
 460                 ERROR_WITH_ERRNO("Failed to open NTFS inode");
 461                 ret = 1;
 462         }
 463         path_len = ctx->path_len;
 464         if (path_len != 1)
 465                 ctx->path[path_len++] = '/';
 466         memcpy(ctx->path + path_len, utf8_name, utf8_name_len + 1);
 467         path_len += utf8_name_len;
 468         ret = build_dentry_tree_ntfs_recursive(&child, ctx->dir_ni,
 469                                                ni, ctx->path, path_len, name_type,
 470                                                ctx->lookup_table, ctx->sd_set,
 471                                                ctx->config, ctx->ntfs_vol_p,
 472                                                ctx->flags);
 473
 474         if (child)
 475                 link_dentry(child, ctx->parent);
 476
 477         ntfs_inode_close(ni);
 478 out_free_utf8_name:
 479         FREE(utf8_name);
 480 out:
 481         return ret;
 482 }
 483
 484 static int change_dentry_short_name(struct dentry *dentry,
 485                                     const char short_name_utf8[],
 486                                     int short_name_utf8_len)
 487 {
 488         size_t short_name_utf16_len;
 489         char *short_name_utf16;
 490         short_name_utf16 = utf8_to_utf16(short_name_utf8, short_name_utf8_len,
 491                                          &short_name_utf16_len);
 492         if (!short_name_utf16) {
 493                 ERROR_WITH_ERRNO("Failed to convert short name to UTF-16");
 494                 return WIMLIB_ERR_NOMEM;
 495         }
 496         dentry->short_name = short_name_utf16;
 497         dentry->short_name_len = short_name_utf16_len;
 498         return 0;
 499 }
 500
 501 /*#define HAVE_NTFS_INODE_FUNCTIONS*/
 502
 503 /* Recursively build a WIM dentry tree corresponding to a NTFS volume.
 504  * At the same time, update the WIM lookup table with lookup table entries for
 505  * the NTFS streams, and build an array of security descriptors.
 506  */
 507 static int build_dentry_tree_ntfs_recursive(struct dentry **root_p,
 508                                             ntfs_inode *dir_ni,
 509                                             ntfs_inode *ni,
 510                                             char path[],
 511                                             size_t path_len,
 512                                             int name_type,
 513                                             struct lookup_table *lookup_table,
 514                                             struct sd_set *sd_set,
 515                                             const struct capture_config *config,
 516                                             ntfs_volume **ntfs_vol_p,
 517                                             int flags)
 518 {
 519         u32 attributes;
 520         int mrec_flags;
 521         u32 sd_size = 0;
 522         int ret;
 523         char dos_name_utf8[64];
 524         struct dentry *root;
 525
 526         mrec_flags = ni->mrec->flags;
 527 #ifdef HAVE_NTFS_INODE_FUNCTIONS
 528         attributes = ntfs_get_inode_attributes(ni);
 529 #else
 530         struct SECURITY_CONTEXT ctx;
 531         memset(&ctx, 0, sizeof(ctx));
 532         ctx.vol = ni->vol;
 533         ret = ntfs_xattr_system_getxattr(&ctx, XATTR_NTFS_ATTRIB,
 534                                          ni, dir_ni, (char *)&attributes,
 535                                          sizeof(u32));
 536         if (ret != 4) {
 537                 ERROR_WITH_ERRNO("Failed to get NTFS attributes from `%s'",
 538                                  path);
 539                 return WIMLIB_ERR_NTFS_3G;
 540         }
 541 #endif
 542
 543         if (exclude_path(path, config, false)) {
 544                 if (flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE) {
 545                         const char *file_type;
 546                         if (attributes & MFT_RECORD_IS_DIRECTORY)
 547                                 file_type = "directory";
 548                         else
 549                                 file_type = "file";
 550                         printf("Excluding %s `%s' from capture\n",
 551                                file_type, path);
 552                 }
 553                 *root_p = NULL;
 554                 return 0;
 555         }
 556
 557         if (flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 558                 printf("Scanning `%s'\n", path);
 559
 560         root = new_dentry(path_basename(path));
 561         if (!root)
 562                 return WIMLIB_ERR_NOMEM;
 563         *root_p = root;
 564
 565         if (dir_ni && (name_type == FILE_NAME_WIN32_AND_DOS
 566                        || name_type == FILE_NAME_WIN32))
 567         {
 568                 ret = ntfs_get_ntfs_dos_name(ni, dir_ni, dos_name_utf8,
 569                                              sizeof(dos_name_utf8));
 570                 if (ret > 0) {
 571                         DEBUG("Changing short name of `%s'", path);
 572                         ret = change_dentry_short_name(root, dos_name_utf8,
 573                                                        ret);
 574                         if (ret != 0)
 575                                 return ret;
 576                 } else {
 577                 #ifdef ENODATA
 578                         if (errno != ENODATA) {
 579                                 ERROR_WITH_ERRNO("Error getting DOS name "
 580                                                  "of `%s'", path);
 581                                 return WIMLIB_ERR_NTFS_3G;
 582                         }
 583                 #endif
 584                 }
 585         }
 586
 587         root->creation_time    = le64_to_cpu(ni->creation_time);
 588         root->last_write_time  = le64_to_cpu(ni->last_data_change_time);
 589         root->last_access_time = le64_to_cpu(ni->last_access_time);
 590         root->attributes       = le32_to_cpu(attributes);
 591         root->link_group_id    = ni->mft_no;
 592         root->resolved         = true;
 593
 594         if (attributes & FILE_ATTR_REPARSE_POINT) {
 595                 /* Junction point, symbolic link, or other reparse point */
 596                 ret = capture_ntfs_streams(root, ni, path, path_len,
 597                                            lookup_table, ntfs_vol_p,
 598                                            AT_REPARSE_POINT);
 599         } else if (mrec_flags & MFT_RECORD_IS_DIRECTORY) {
 600
 601                 /* Normal directory */
 602                 s64 pos = 0;
 603                 struct readdir_ctx ctx = {
 604                         .parent       = root,
 605                         .dir_ni       = ni,
 606                         .path         = path,
 607                         .path_len     = path_len,
 608                         .lookup_table = lookup_table,
 609                         .sd_set       = sd_set,
 610                         .config       = config,
 611                         .ntfs_vol_p   = ntfs_vol_p,
 612                         .flags        = flags,
 613                 };
 614                 ret = ntfs_readdir(ni, &pos, &ctx, wim_ntfs_capture_filldir);
 615                 if (ret != 0) {
 616                         ERROR_WITH_ERRNO("ntfs_readdir()");
 617                         ret = WIMLIB_ERR_NTFS_3G;
 618                 }
 619         } else {
 620                 /* Normal file */
 621                 ret = capture_ntfs_streams(root, ni, path, path_len,
 622                                            lookup_table, ntfs_vol_p,
 623                                            AT_DATA);
 624         }
 625         if (ret != 0)
 626                 return ret;
 627
 628 #ifdef HAVE_NTFS_INODE_FUNCTIONS
 629         ret = ntfs_get_inode_security(ni,
 630                                       OWNER_SECURITY_INFORMATION |
 631                                       GROUP_SECURITY_INFORMATION |
 632                                       DACL_SECURITY_INFORMATION  |
 633                                       SACL_SECURITY_INFORMATION,
 634                                       NULL, 0, &sd_size);
 635         char sd[sd_size];
 636         ret = ntfs_get_inode_security(ni,
 637                                       OWNER_SECURITY_INFORMATION |
 638                                       GROUP_SECURITY_INFORMATION |
 639                                       DACL_SECURITY_INFORMATION  |
 640                                       SACL_SECURITY_INFORMATION,
 641                                       sd, sd_size, &sd_size);
 642         if (ret == 0) {
 643                 ERROR_WITH_ERRNO("Failed to get security information from "
 644                                  "`%s'", path);
 645                 ret = WIMLIB_ERR_NTFS_3G;
 646         } else {
 647                 if (ret > 0) {
 648                         /*print_security_descriptor(sd, sd_size);*/
 649                         root->security_id = sd_set_add_sd(sd_set, sd, ret);
 650                         if (root->security_id == -1) {
 651                                 ERROR("Out of memory");
 652                                 return WIMLIB_ERR_NOMEM;
 653                         }
 654                         DEBUG("Added security ID = %u for `%s'",
 655                               root->security_id, path);
 656                 } else {
 657                         root->security_id = -1;
 658                         DEBUG("No security ID for `%s'", path);
 659                 }
 660                 ret = 0;
 661         }
 662 #else
 663         char _sd[1];
 664         char *sd = _sd;
 665         errno = 0;
 666         ret = ntfs_xattr_system_getxattr(&ctx, XATTR_NTFS_ACL,
 667                                          ni, dir_ni, sd,
 668                                          sizeof(sd));
 669         if (ret > sizeof(sd)) {
 670                 sd = alloca(ret);
 671                 ret = ntfs_xattr_system_getxattr(&ctx, XATTR_NTFS_ACL,
 672                                                  ni, dir_ni, sd, ret);
 673         }
 674         if (ret > 0) {
 675                 root->security_id = sd_set_add_sd(sd_set, sd, ret);
 676                 if (root->security_id == -1) {
 677                         ERROR("Out of memory");
 678                         return WIMLIB_ERR_NOMEM;
 679                 }
 680                 DEBUG("Added security ID = %u for `%s'",
 681                       root->security_id, path);
 682                 ret = 0;
 683         } else if (ret < 0) {
 684                 ERROR_WITH_ERRNO("Failed to get security information from "
 685                                  "`%s'", path);
 686                 ret = WIMLIB_ERR_NTFS_3G;
 687         } else {
 688                 root->security_id = -1;
 689                 DEBUG("No security ID for `%s'", path);
 690         }
 691 #endif
 692         return ret;
 693 }
 694
 695 static int build_dentry_tree_ntfs(struct dentry **root_p,
 696                                   const char *device,
 697                                   struct lookup_table *lookup_table,
 698                                   struct wim_security_data *sd,
 699                                   const struct capture_config *config,
 700                                   int flags,
 701                                   void *extra_arg)
 702 {
 703         ntfs_volume *vol;
 704         ntfs_inode *root_ni;
 705         int ret = 0;
 706         struct sd_set sd_set = {
 707                 .sd = sd,
 708                 .root = NULL,
 709         };
 710         ntfs_volume **ntfs_vol_p = extra_arg;
 711
 712         DEBUG("Mounting NTFS volume `%s' read-only", device);
 713
 714         vol = ntfs_mount(device, MS_RDONLY);
 715         if (!vol) {
 716                 ERROR_WITH_ERRNO("Failed to mount NTFS volume `%s' read-only",
 717                                  device);
 718                 return WIMLIB_ERR_NTFS_3G;
 719         }
 720         ntfs_open_secure(vol);
 721
 722         /* We don't want to capture the special NTFS files such as $Bitmap.  Not
 723          * to be confused with "hidden" or "system" files which are real files
 724          * that we do need to capture.  */
 725         NVolClearShowSysFiles(vol);
 726
 727         DEBUG("Opening root NTFS dentry");
 728         root_ni = ntfs_inode_open(vol, FILE_root);
 729         if (!root_ni) {
 730                 ERROR_WITH_ERRNO("Failed to open root inode of NTFS volume "
 731                                  "`%s'", device);
 732                 ret = WIMLIB_ERR_NTFS_3G;
 733                 goto out;
 734         }
 735
 736         /* Currently we assume that all the UTF-8 paths fit into this length and
 737          * there is no check for overflow. */
 738         char *path = MALLOC(32768);
 739         if (!path) {
 740                 ERROR("Could not allocate memory for NTFS pathname");
 741                 goto out_cleanup;
 742         }
 743
 744         path[0] = '/';
 745         path[1] = '\0';
 746         ret = build_dentry_tree_ntfs_recursive(root_p, NULL, root_ni, path, 1,
 747                                                FILE_NAME_POSIX, lookup_table,
 748                                                &sd_set, config, ntfs_vol_p,
 749                                                flags);
 750 out_cleanup:
 751         FREE(path);
 752         ntfs_inode_close(root_ni);
 753         destroy_sd_set(&sd_set);
 754
 755 out:
 756         if (ret) {
 757                 if (ntfs_umount(vol, FALSE) != 0) {
 758                         ERROR_WITH_ERRNO("Failed to unmount NTFS volume `%s'",
 759                                          device);
 760                         if (ret == 0)
 761                                 ret = WIMLIB_ERR_NTFS_3G;
 762                 }
 763         } else {
 764                 /* We need to leave the NTFS volume mounted so that we can read
 765                  * the NTFS files again when we are actually writing the WIM */
 766                 *ntfs_vol_p = vol;
 767         }
 768         return ret;
 769 }
 770
 771
 772
 773 WIMLIBAPI int wimlib_add_image_from_ntfs_volume(WIMStruct *w,
 774                                                 const char *device,
 775                                                 const char *name,
 776                                                 const char *config_str,
 777                                                 size_t config_len,
 778                                                 int flags)
 779 {
 780         if (flags & (WIMLIB_ADD_IMAGE_FLAG_DEREFERENCE)) {
 781                 ERROR("Cannot dereference files when capturing directly from NTFS");
 782                 return WIMLIB_ERR_INVALID_PARAM;
 783         }
 784         return do_add_image(w, device, name, config_str, config_len, flags,
 785                             build_dentry_tree_ntfs, &w->ntfs_vol);
 786 }
 787
 788 #else /* WITH_NTFS_3G */
 789 WIMLIBAPI int wimlib_add_image_from_ntfs_volume(WIMStruct *w,
 790                                                 const char *device,
 791                                                 const char *name,
 792                                                 const char *config_str,
 793                                                 size_t config_len,
 794                                                 int flags)
 795 {
 796         ERROR("wimlib was compiled without support for NTFS-3g, so");
 797         ERROR("we cannot capture a WIM image directly from a NTFS volume");
 798         return WIMLIB_ERR_UNSUPPORTED;
 799 }
 800 #endif /* WITH_NTFS_3G */