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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 #include "config.h"
  28 #include "wimlib_internal.h"
  29
  30
  31 #ifdef WITH_NTFS_3G
  32 #include "dentry.h"
  33 #include "lookup_table.h"
  34 #include "io.h"
  35 #include <ntfs-3g/layout.h>
  36 #include <ntfs-3g/acls.h>
  37 #include <ntfs-3g/attrib.h>
  38 #include <ntfs-3g/misc.h>
  39 #include <ntfs-3g/reparse.h>
  40 #include <ntfs-3g/security.h> /* security.h before xattrs.h */
  41 #include <ntfs-3g/xattrs.h>
  42 #include <ntfs-3g/volume.h>
  43 #include <stdlib.h>
  44 #include <unistd.h>
  45 #include <errno.h>
  46
  47 #if 0
  48 extern int ntfs_get_inode_security(ntfs_inode *ni, u32 selection, char *buf,
  49                                    u32 buflen, u32 *psize);
  50
  51 extern u32 ntfs_get_inode_attributes(ntfs_inode *ni);
  52 #endif
  53
  54 /* Structure that allows searching the security descriptors by SHA1 message
  55  * digest. */
  56 struct sd_set {
  57         struct wim_security_data *sd;
  58         struct sd_node *root;
  59 };
  60
  61 /* Binary tree node of security descriptors, indexed by the @hash field. */
  62 struct sd_node {
  63         int security_id;
  64         u8 hash[SHA1_HASH_SIZE];
  65         struct sd_node *left;
  66         struct sd_node *right;
  67 };
  68
  69 static void free_sd_tree(struct sd_node *root)
  70 {
  71         if (root) {
  72                 free_sd_tree(root->left);
  73                 free_sd_tree(root->right);
  74                 FREE(root);
  75         }
  76 }
  77 /* Frees a security descriptor index set. */
  78 static void destroy_sd_set(struct sd_set *sd_set)
  79 {
  80         free_sd_tree(sd_set->root);
  81 }
  82
  83 /* Inserts a a new node into the security descriptor index tree. */
  84 static void insert_sd_node(struct sd_node *new, struct sd_node *root)
  85 {
  86         int cmp = hashes_cmp(new->hash, root->hash);
  87         if (cmp < 0) {
  88                 if (root->left)
  89                         insert_sd_node(new, root->left);
  90                 else
  91                         root->left = new;
  92         } else if (cmp > 0) {
  93                 if (root->right)
  94                         insert_sd_node(new, root->right);
  95                 else
  96                         root->right = new;
  97         } else {
  98                 wimlib_assert(0);
  99         }
 100 }
 101
 102 /* Returns the security ID of the security data having a SHA1 message digest of
 103  * @hash in the security descriptor index tree rooted at @root.
 104  *
 105  * If not found, return -1. */
 106 static int lookup_sd(const u8 hash[SHA1_HASH_SIZE], struct sd_node *root)
 107 {
 108         int cmp;
 109         if (!root)
 110                 return -1;
 111         cmp = hashes_cmp(hash, root->hash);
 112         if (cmp < 0)
 113                 return lookup_sd(hash, root->left);
 114         else if (cmp > 0)
 115                 return lookup_sd(hash, root->right);
 116         else
 117                 return root->security_id;
 118 }
 119
 120 /*
 121  * Adds a security descriptor to the indexed security descriptor set as well as
 122  * the corresponding `struct wim_security_data', and returns the new security
 123  * ID; or, if there is an existing security descriptor that is the same, return
 124  * the security ID for it.  If a new security descriptor cannot be allocated,
 125  * return -1.
 126  */
 127 static int sd_set_add_sd(struct sd_set *sd_set, const char descriptor[],
 128                          size_t size)
 129 {
 130         u8 hash[SHA1_HASH_SIZE];
 131         int security_id;
 132         struct sd_node *new;
 133         u8 **descriptors;
 134         u64 *sizes;
 135         u8 *descr_copy;
 136         struct wim_security_data *sd;
 137
 138         sha1_buffer((const u8*)descriptor, size, hash);
 139
 140         security_id = lookup_sd(hash, sd_set->root);
 141         if (security_id >= 0)
 142                 return security_id;
 143
 144         new = MALLOC(sizeof(*new));
 145         if (!new)
 146                 goto out;
 147         descr_copy = MALLOC(size);
 148         if (!descr_copy)
 149                 goto out_free_node;
 150
 151         sd = sd_set->sd;
 152
 153         memcpy(descr_copy, descriptor, size);
 154         new->security_id = sd->num_entries;
 155         new->left = NULL;
 156         new->right = NULL;
 157         copy_hash(new->hash, hash);
 158
 159
 160         descriptors = REALLOC(sd->descriptors,
 161                               (sd->num_entries + 1) * sizeof(sd->descriptors[0]));
 162         if (!descriptors)
 163                 goto out_free_descr;
 164         sd->descriptors = descriptors;
 165         sizes = REALLOC(sd->sizes,
 166                         (sd->num_entries + 1) * sizeof(sd->sizes[0]));
 167         if (!sizes)
 168                 goto out_free_descr;
 169         sd->sizes = sizes;
 170         sd->descriptors[sd->num_entries] = descr_copy;
 171         sd->sizes[sd->num_entries] = size;
 172         sd->num_entries++;
 173         DEBUG("There are now %d security descriptors", sd->num_entries);
 174         sd->total_length += size + sizeof(sd->sizes[0]);
 175
 176         if (sd_set->root)
 177                 insert_sd_node(new, sd_set->root);
 178         else
 179                 sd_set->root = new;
 180         return new->security_id;
 181 out_free_descr:
 182         FREE(descr_copy);
 183 out_free_node:
 184         FREE(new);
 185 out:
 186         return -1;
 187 }
 188
 189 static inline ntfschar *attr_record_name(ATTR_RECORD *ar)
 190 {
 191         return (ntfschar*)((u8*)ar + le16_to_cpu(ar->name_offset));
 192 }
 193
 194 /* Calculates the SHA1 message digest of a NTFS attribute.
 195  *
 196  * @ni:  The NTFS inode containing the attribute.
 197  * @ar:  The ATTR_RECORD describing the attribute.
 198  * @md:  If successful, the returned SHA1 message digest.
 199  * @reparse_tag_ret:    Optional pointer into which the first 4 bytes of the
 200  *                              attribute will be written (to get the reparse
 201  *                              point ID)
 202  *
 203  * Return 0 on success or nonzero on error.
 204  */
 205 static int ntfs_attr_sha1sum(ntfs_inode *ni, ATTR_RECORD *ar,
 206                              u8 md[SHA1_HASH_SIZE],
 207                              u32 *reparse_tag_ret)
 208 {
 209         s64 pos = 0;
 210         s64 bytes_remaining;
 211         char buf[4096];
 212         ntfs_attr *na;
 213         SHA_CTX ctx;
 214
 215         na = ntfs_attr_open(ni, ar->type, attr_record_name(ar),
 216                             ar->name_length);
 217         if (!na) {
 218                 ERROR_WITH_ERRNO("Failed to open NTFS attribute");
 219                 return WIMLIB_ERR_NTFS_3G;
 220         }
 221
 222         bytes_remaining = na->data_size;
 223         sha1_init(&ctx);
 224
 225         DEBUG2("Calculating SHA1 message digest (%"PRIu64" bytes)",
 226                bytes_remaining);
 227
 228         while (bytes_remaining) {
 229                 s64 to_read = min(bytes_remaining, sizeof(buf));
 230                 if (ntfs_attr_pread(na, pos, to_read, buf) != to_read) {
 231                         ERROR_WITH_ERRNO("Error reading NTFS attribute");
 232                         return WIMLIB_ERR_NTFS_3G;
 233                 }
 234                 if (bytes_remaining == na->data_size && reparse_tag_ret)
 235                         *reparse_tag_ret = le32_to_cpu(*(u32*)buf);
 236                 sha1_update(&ctx, buf, to_read);
 237                 pos += to_read;
 238                 bytes_remaining -= to_read;
 239         }
 240         sha1_final(md, &ctx);
 241         ntfs_attr_close(na);
 242         return 0;
 243 }
 244
 245 /* Load the streams from a WIM file or reparse point in the NTFS volume into the
 246  * WIM lookup table */
 247 static int capture_ntfs_streams(struct dentry *dentry, ntfs_inode *ni,
 248                                 char path[], size_t path_len,
 249                                 struct lookup_table *lookup_table,
 250                                 ntfs_volume **ntfs_vol_p,
 251                                 ATTR_TYPES type)
 252 {
 253
 254         ntfs_attr_search_ctx *actx;
 255         u8 attr_hash[SHA1_HASH_SIZE];
 256         struct ntfs_location *ntfs_loc = NULL;
 257         int ret = 0;
 258         struct lookup_table_entry *lte;
 259
 260         DEBUG2("Capturing NTFS data streams from `%s'", path);
 261
 262         /* Get context to search the streams of the NTFS file. */
 263         actx = ntfs_attr_get_search_ctx(ni, NULL);
 264         if (!actx) {
 265                 ERROR_WITH_ERRNO("Cannot get NTFS attribute search "
 266                                  "context");
 267                 return WIMLIB_ERR_NTFS_3G;
 268         }
 269
 270         /* Capture each data stream or reparse data stream. */
 271         while (!ntfs_attr_lookup(type, NULL, 0,
 272                                  CASE_SENSITIVE, 0, NULL, 0, actx))
 273         {
 274                 char *stream_name_utf8;
 275                 size_t stream_name_utf16_len;
 276                 u32 reparse_tag;
 277                 u64 data_size = ntfs_get_attribute_value_length(actx->attr);
 278                 u64 name_length = actx->attr->name_length;
 279
 280                 if (data_size == 0) {
 281                         if (errno != 0) {
 282                                 ERROR_WITH_ERRNO("Failed to get size of attribute of "
 283                                                  "`%s'", path);
 284                                 ret = WIMLIB_ERR_NTFS_3G;
 285                                 goto out_put_actx;
 286                         }
 287                         /* Empty stream.  No lookup table entry is needed. */
 288                         lte = NULL;
 289                 } else {
 290                         if (type == AT_REPARSE_POINT && data_size < 8) {
 291                                 ERROR("`%s': reparse point buffer too small",
 292                                       path);
 293                                 ret = WIMLIB_ERR_NTFS_3G;
 294                                 goto out_put_actx;
 295                         }
 296                         /* Checksum the stream. */
 297                         ret = ntfs_attr_sha1sum(ni, actx->attr, attr_hash, &reparse_tag);
 298                         if (ret != 0)
 299                                 goto out_put_actx;
 300
 301                         /* Make a lookup table entry for the stream, or use an existing
 302                          * one if there's already an identical stream. */
 303                         lte = __lookup_resource(lookup_table, attr_hash);
 304                         ret = WIMLIB_ERR_NOMEM;
 305                         if (lte) {
 306                                 lte->refcnt++;
 307                         } else {
 308                                 ntfs_loc = CALLOC(1, sizeof(*ntfs_loc));
 309                                 if (!ntfs_loc)
 310                                         goto out_put_actx;
 311                                 ntfs_loc->ntfs_vol_p = ntfs_vol_p;
 312                                 ntfs_loc->path_utf8 = MALLOC(path_len + 1);
 313                                 if (!ntfs_loc->path_utf8)
 314                                         goto out_free_ntfs_loc;
 315                                 memcpy(ntfs_loc->path_utf8, path, path_len + 1);
 316                                 if (name_length) {
 317                                         ntfs_loc->stream_name_utf16 = MALLOC(name_length * 2);
 318                                         if (!ntfs_loc->stream_name_utf16)
 319                                                 goto out_free_ntfs_loc;
 320                                         memcpy(ntfs_loc->stream_name_utf16,
 321                                                attr_record_name(actx->attr),
 322                                                actx->attr->name_length * 2);
 323                                         ntfs_loc->stream_name_utf16_num_chars = name_length;
 324                                 }
 325
 326                                 lte = new_lookup_table_entry();
 327                                 if (!lte)
 328                                         goto out_free_ntfs_loc;
 329                                 lte->ntfs_loc = ntfs_loc;
 330                                 lte->resource_location = RESOURCE_IN_NTFS_VOLUME;
 331                                 if (type == AT_REPARSE_POINT) {
 332                                         dentry->reparse_tag = reparse_tag;
 333                                         ntfs_loc->is_reparse_point = true;
 334                                         lte->resource_entry.original_size = data_size - 8;
 335                                         lte->resource_entry.size = data_size - 8;
 336                                 } else {
 337                                         ntfs_loc->is_reparse_point = false;
 338                                         lte->resource_entry.original_size = data_size;
 339                                         lte->resource_entry.size = data_size;
 340                                 }
 341                                 ntfs_loc = NULL;
 342                                 DEBUG("Add resource for `%s' (size = %zu)",
 343                                       dentry->file_name_utf8,
 344                                       lte->resource_entry.original_size);
 345                                 copy_hash(lte->hash, attr_hash);
 346                                 lookup_table_insert(lookup_table, lte);
 347                         }
 348                 }
 349                 if (name_length == 0) {
 350                         /* Unnamed data stream.  Put the reference to it in the
 351                          * dentry. */
 352                         if (dentry->lte) {
 353                                 ERROR("Found two un-named data streams for "
 354                                       "`%s'", path);
 355                                 ret = WIMLIB_ERR_NTFS_3G;
 356                                 goto out_free_lte;
 357                         }
 358                         dentry->lte = lte;
 359                 } else {
 360                         /* Named data stream.  Put the reference to it in the
 361                          * alternate data stream entries */
 362                         struct ads_entry *new_ads_entry;
 363                         size_t stream_name_utf8_len;
 364                         stream_name_utf8 = utf16_to_utf8((const char*)attr_record_name(actx->attr),
 365                                                          name_length * 2,
 366                                                          &stream_name_utf8_len);
 367                         if (!stream_name_utf8)
 368                                 goto out_free_lte;
 369                         new_ads_entry = dentry_add_ads(dentry, stream_name_utf8);
 370                         FREE(stream_name_utf8);
 371                         if (!new_ads_entry)
 372                                 goto out_free_lte;
 373
 374                         wimlib_assert(new_ads_entry->stream_name_len == name_length * 2);
 375
 376                         new_ads_entry->lte = lte;
 377                 }
 378         }
 379         ret = 0;
 380         goto out_put_actx;
 381 out_free_lte:
 382         free_lookup_table_entry(lte);
 383 out_free_ntfs_loc:
 384         if (ntfs_loc) {
 385                 FREE(ntfs_loc->path_utf8);
 386                 FREE(ntfs_loc->stream_name_utf16);
 387                 FREE(ntfs_loc);
 388         }
 389 out_put_actx:
 390         ntfs_attr_put_search_ctx(actx);
 391         if (ret == 0)
 392                 DEBUG2("Successfully captured NTFS streams from `%s'", path);
 393         else
 394                 ERROR("Failed to capture NTFS streams from `%s", path);
 395         return ret;
 396 }
 397
 398 struct readdir_ctx {
 399         struct dentry       *parent;
 400         ntfs_inode          *dir_ni;
 401         char                *path;
 402         size_t               path_len;
 403         struct lookup_table *lookup_table;
 404         struct sd_set       *sd_set;
 405         const struct capture_config *config;
 406         ntfs_volume        **ntfs_vol_p;
 407         int                  flags;
 408 };
 409
 410 static int
 411 build_dentry_tree_ntfs_recursive(struct dentry **root_p, ntfs_inode *dir_ni,
 412                                  ntfs_inode *ni, char path[], size_t path_len,
 413                                  int name_type,
 414                                  struct lookup_table *lookup_table,
 415                                  struct sd_set *sd_set,
 416                                  const struct capture_config *config,
 417                                  ntfs_volume **ntfs_vol_p,
 418                                  int flags);
 419
 420 static int wim_ntfs_capture_filldir(void *dirent, const ntfschar *name,
 421                                     const int name_len, const int name_type,
 422                                     const s64 pos, const MFT_REF mref,
 423                                     const unsigned dt_type)
 424 {
 425         struct readdir_ctx *ctx;
 426         size_t utf8_name_len;
 427         char *utf8_name;
 428         struct dentry *child = NULL;
 429         int ret;
 430         size_t path_len;
 431
 432         if (name_type == FILE_NAME_DOS)
 433                 return 0;
 434
 435         ret = -1;
 436
 437         utf8_name = utf16_to_utf8((const char*)name, name_len * 2,
 438                                   &utf8_name_len);
 439         if (!utf8_name)
 440                 goto out;
 441
 442         if (utf8_name[0] == '.' &&
 443              (utf8_name[1] == '\0' ||
 444               (utf8_name[1] == '.' && utf8_name[2] == '\0'))) {
 445                 ret = 0;
 446                 goto out_free_utf8_name;
 447         }
 448
 449         ctx = dirent;
 450
 451         ntfs_inode *ni = ntfs_inode_open(ctx->dir_ni->vol, mref);
 452         if (!ni) {
 453                 ERROR_WITH_ERRNO("Failed to open NTFS inode");
 454                 ret = 1;
 455         }
 456         path_len = ctx->path_len;
 457         if (path_len != 1)
 458                 ctx->path[path_len++] = '/';
 459         memcpy(ctx->path + path_len, utf8_name, utf8_name_len + 1);
 460         path_len += utf8_name_len;
 461         ret = build_dentry_tree_ntfs_recursive(&child, ctx->dir_ni,
 462                                                ni, ctx->path, path_len, name_type,
 463                                                ctx->lookup_table, ctx->sd_set,
 464                                                ctx->config, ctx->ntfs_vol_p,
 465                                                ctx->flags);
 466
 467         if (child)
 468                 link_dentry(child, ctx->parent);
 469
 470         ntfs_inode_close(ni);
 471 out_free_utf8_name:
 472         FREE(utf8_name);
 473 out:
 474         return ret;
 475 }
 476
 477 static int change_dentry_short_name(struct dentry *dentry,
 478                                     const char short_name_utf8[],
 479                                     int short_name_utf8_len)
 480 {
 481         size_t short_name_utf16_len;
 482         char *short_name_utf16;
 483         short_name_utf16 = utf8_to_utf16(short_name_utf8, short_name_utf8_len,
 484                                          &short_name_utf16_len);
 485         if (!short_name_utf16) {
 486                 ERROR_WITH_ERRNO("Failed to convert short name to UTF-16");
 487                 return WIMLIB_ERR_NOMEM;
 488         }
 489         dentry->short_name = short_name_utf16;
 490         dentry->short_name_len = short_name_utf16_len;
 491         return 0;
 492 }
 493
 494 /*#define HAVE_NTFS_INODE_FUNCTIONS*/
 495
 496 /* Recursively build a WIM dentry tree corresponding to a NTFS volume.
 497  * At the same time, update the WIM lookup table with lookup table entries for
 498  * the NTFS streams, and build an array of security descriptors.
 499  */
 500 static int build_dentry_tree_ntfs_recursive(struct dentry **root_p,
 501                                             ntfs_inode *dir_ni,
 502                                             ntfs_inode *ni,
 503                                             char path[],
 504                                             size_t path_len,
 505                                             int name_type,
 506                                             struct lookup_table *lookup_table,
 507                                             struct sd_set *sd_set,
 508                                             const struct capture_config *config,
 509                                             ntfs_volume **ntfs_vol_p,
 510                                             int flags)
 511 {
 512         u32 attributes;
 513         int mrec_flags;
 514         u32 sd_size = 0;
 515         int ret;
 516         char dos_name_utf8[64];
 517         struct dentry *root;
 518
 519         mrec_flags = ni->mrec->flags;
 520 #ifdef HAVE_NTFS_INODE_FUNCTIONS
 521         attributes = ntfs_get_inode_attributes(ni);
 522 #else
 523         struct SECURITY_CONTEXT ctx;
 524         memset(&ctx, 0, sizeof(ctx));
 525         ctx.vol = ni->vol;
 526         ret = ntfs_xattr_system_getxattr(&ctx, XATTR_NTFS_ATTRIB,
 527                                          ni, dir_ni, (char *)&attributes,
 528                                          sizeof(u32));
 529         if (ret != 4) {
 530                 ERROR_WITH_ERRNO("Failed to get NTFS attributes from `%s'",
 531                                  path);
 532                 return WIMLIB_ERR_NTFS_3G;
 533         }
 534 #endif
 535
 536         if (exclude_path(path, config, false)) {
 537                 if (flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE) {
 538                         const char *file_type;
 539                         if (attributes & MFT_RECORD_IS_DIRECTORY)
 540                                 file_type = "directory";
 541                         else
 542                                 file_type = "file";
 543                         printf("Excluding %s `%s' from capture\n",
 544                                file_type, path);
 545                 }
 546                 *root_p = NULL;
 547                 return 0;
 548         }
 549
 550         if (flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 551                 printf("Scanning `%s'\n", path);
 552
 553         root = new_dentry(path_basename(path));
 554         if (!root)
 555                 return WIMLIB_ERR_NOMEM;
 556         *root_p = root;
 557
 558         if (dir_ni && (name_type == FILE_NAME_WIN32_AND_DOS
 559                        || name_type == FILE_NAME_WIN32))
 560         {
 561                 ret = ntfs_get_ntfs_dos_name(ni, dir_ni, dos_name_utf8,
 562                                              sizeof(dos_name_utf8));
 563                 if (ret > 0) {
 564                         DEBUG("Changing short name of `%s'", path);
 565                         ret = change_dentry_short_name(root, dos_name_utf8,
 566                                                        ret);
 567                         if (ret != 0)
 568                                 return ret;
 569                 } else {
 570                         if (errno != ENODATA) {
 571                                 ERROR_WITH_ERRNO("Error getting DOS name "
 572                                                  "of `%s'", path);
 573                                 return WIMLIB_ERR_NTFS_3G;
 574                         }
 575                 }
 576         }
 577
 578         root->creation_time    = le64_to_cpu(ni->creation_time);
 579         root->last_write_time  = le64_to_cpu(ni->last_data_change_time);
 580         root->last_access_time = le64_to_cpu(ni->last_access_time);
 581         root->attributes       = le32_to_cpu(attributes);
 582         root->link_group_id    = ni->mft_no;
 583         root->resolved         = true;
 584
 585         if (attributes & FILE_ATTR_REPARSE_POINT) {
 586                 /* Junction point, symbolic link, or other reparse point */
 587                 ret = capture_ntfs_streams(root, ni, path, path_len,
 588                                            lookup_table, ntfs_vol_p,
 589                                            AT_REPARSE_POINT);
 590         } else if (mrec_flags & MFT_RECORD_IS_DIRECTORY) {
 591
 592                 /* Normal directory */
 593                 s64 pos = 0;
 594                 struct readdir_ctx ctx = {
 595                         .parent       = root,
 596                         .dir_ni       = ni,
 597                         .path         = path,
 598                         .path_len     = path_len,
 599                         .lookup_table = lookup_table,
 600                         .sd_set       = sd_set,
 601                         .config       = config,
 602                         .ntfs_vol_p   = ntfs_vol_p,
 603                         .flags        = flags,
 604                 };
 605                 ret = ntfs_readdir(ni, &pos, &ctx, wim_ntfs_capture_filldir);
 606                 if (ret != 0) {
 607                         ERROR_WITH_ERRNO("ntfs_readdir()");
 608                         ret = WIMLIB_ERR_NTFS_3G;
 609                 }
 610         } else {
 611                 /* Normal file */
 612                 ret = capture_ntfs_streams(root, ni, path, path_len,
 613                                            lookup_table, ntfs_vol_p,
 614                                            AT_DATA);
 615         }
 616         if (ret != 0)
 617                 return ret;
 618
 619 #ifdef HAVE_NTFS_INODE_FUNCTIONS
 620         ret = ntfs_get_inode_security(ni,
 621                                       OWNER_SECURITY_INFORMATION |
 622                                       GROUP_SECURITY_INFORMATION |
 623                                       DACL_SECURITY_INFORMATION  |
 624                                       SACL_SECURITY_INFORMATION,
 625                                       NULL, 0, &sd_size);
 626         char sd[sd_size];
 627         ret = ntfs_get_inode_security(ni,
 628                                       OWNER_SECURITY_INFORMATION |
 629                                       GROUP_SECURITY_INFORMATION |
 630                                       DACL_SECURITY_INFORMATION  |
 631                                       SACL_SECURITY_INFORMATION,
 632                                       sd, sd_size, &sd_size);
 633         if (ret == 0) {
 634                 ERROR_WITH_ERRNO("Failed to get security information from "
 635                                  "`%s'", path);
 636                 ret = WIMLIB_ERR_NTFS_3G;
 637         } else {
 638                 if (ret > 0) {
 639                         /*print_security_descriptor(sd, sd_size);*/
 640                         root->security_id = sd_set_add_sd(sd_set, sd, ret);
 641                         if (root->security_id == -1) {
 642                                 ERROR("Out of memory");
 643                                 return WIMLIB_ERR_NOMEM;
 644                         }
 645                         DEBUG("Added security ID = %u for `%s'",
 646                               root->security_id, path);
 647                 } else {
 648                         root->security_id = -1;
 649                         DEBUG("No security ID for `%s'", path);
 650                 }
 651                 ret = 0;
 652         }
 653 #else
 654         char _sd[1];
 655         char *sd = _sd;
 656         errno = 0;
 657         ret = ntfs_xattr_system_getxattr(&ctx, XATTR_NTFS_ACL,
 658                                          ni, dir_ni, sd,
 659                                          sizeof(sd));
 660         if (ret > sizeof(sd)) {
 661                 sd = alloca(ret);
 662                 ret = ntfs_xattr_system_getxattr(&ctx, XATTR_NTFS_ACL,
 663                                                  ni, dir_ni, sd, ret);
 664         }
 665         if (ret > 0) {
 666                 root->security_id = sd_set_add_sd(sd_set, sd, ret);
 667                 if (root->security_id == -1) {
 668                         ERROR("Out of memory");
 669                         return WIMLIB_ERR_NOMEM;
 670                 }
 671                 DEBUG("Added security ID = %u for `%s'",
 672                       root->security_id, path);
 673                 ret = 0;
 674         } else if (ret < 0) {
 675                 ERROR_WITH_ERRNO("Failed to get security information from "
 676                                  "`%s'", path);
 677                 ret = WIMLIB_ERR_NTFS_3G;
 678         } else {
 679                 root->security_id = -1;
 680                 DEBUG("No security ID for `%s'", path);
 681         }
 682 #endif
 683         return ret;
 684 }
 685
 686 static int build_dentry_tree_ntfs(struct dentry **root_p,
 687                                   const char *device,
 688                                   struct lookup_table *lookup_table,
 689                                   struct wim_security_data *sd,
 690                                   const struct capture_config *config,
 691                                   int flags,
 692                                   void *extra_arg)
 693 {
 694         ntfs_volume *vol;
 695         ntfs_inode *root_ni;
 696         int ret = 0;
 697         struct sd_set sd_set = {
 698                 .sd = sd,
 699                 .root = NULL,
 700         };
 701         ntfs_volume **ntfs_vol_p = extra_arg;
 702
 703         DEBUG("Mounting NTFS volume `%s' read-only", device);
 704
 705         vol = ntfs_mount(device, MS_RDONLY);
 706         if (!vol) {
 707                 ERROR_WITH_ERRNO("Failed to mount NTFS volume `%s' read-only",
 708                                  device);
 709                 return WIMLIB_ERR_NTFS_3G;
 710         }
 711         ntfs_open_secure(vol);
 712
 713         /* We don't want to capture the special NTFS files such as $Bitmap.  Not
 714          * to be confused with "hidden" or "system" files which are real files
 715          * that we do need to capture.  */
 716         NVolClearShowSysFiles(vol);
 717
 718         DEBUG("Opening root NTFS dentry");
 719         root_ni = ntfs_inode_open(vol, FILE_root);
 720         if (!root_ni) {
 721                 ERROR_WITH_ERRNO("Failed to open root inode of NTFS volume "
 722                                  "`%s'", device);
 723                 ret = WIMLIB_ERR_NTFS_3G;
 724                 goto out;
 725         }
 726
 727         /* Currently we assume that all the UTF-8 paths fit into this length and
 728          * there is no check for overflow. */
 729         char *path = MALLOC(32768);
 730         if (!path) {
 731                 ERROR("Could not allocate memory for NTFS pathname");
 732                 goto out_cleanup;
 733         }
 734
 735         path[0] = '/';
 736         path[1] = '\0';
 737         ret = build_dentry_tree_ntfs_recursive(root_p, NULL, root_ni, path, 1,
 738                                                FILE_NAME_POSIX, lookup_table,
 739                                                &sd_set, config, ntfs_vol_p,
 740                                                flags);
 741 out_cleanup:
 742         FREE(path);
 743         ntfs_inode_close(root_ni);
 744         destroy_sd_set(&sd_set);
 745
 746 out:
 747         if (ret) {
 748                 if (ntfs_umount(vol, FALSE) != 0) {
 749                         ERROR_WITH_ERRNO("Failed to unmount NTFS volume `%s'",
 750                                          device);
 751                         if (ret == 0)
 752                                 ret = WIMLIB_ERR_NTFS_3G;
 753                 }
 754         } else {
 755                 /* We need to leave the NTFS volume mounted so that we can read
 756                  * the NTFS files again when we are actually writing the WIM */
 757                 *ntfs_vol_p = vol;
 758         }
 759         return ret;
 760 }
 761
 762
 763
 764 WIMLIBAPI int wimlib_add_image_from_ntfs_volume(WIMStruct *w,
 765                                                 const char *device,
 766                                                 const char *name,
 767                                                 const char *config_str,
 768                                                 size_t config_len,
 769                                                 int flags)
 770 {
 771         if (flags & (WIMLIB_ADD_IMAGE_FLAG_DEREFERENCE)) {
 772                 ERROR("Cannot dereference files when capturing directly from NTFS");
 773                 return WIMLIB_ERR_INVALID_PARAM;
 774         }
 775         return do_add_image(w, device, name, config_str, config_len, flags,
 776                             build_dentry_tree_ntfs, &w->ntfs_vol);
 777 }
 778
 779 #else /* WITH_NTFS_3G */
 780 WIMLIBAPI int wimlib_add_image_from_ntfs_volume(WIMStruct *w,
 781                                                 const char *device,
 782                                                 const char *name,
 783                                                 const char *config_str,
 784                                                 size_t config_len,
 785                                                 int flags)
 786 {
 787         ERROR("wimlib was compiled without support for NTFS-3g, so");
 788         ERROR("we cannot capture a WIM image directly from a NTFS volume");
 789         return WIMLIB_ERR_UNSUPPORTED;
 790 }
 791 #endif /* WITH_NTFS_3G */